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Insights: Basement Cracks / Cracks in General |
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Product Insights: Helpful Injection System Basics |
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Injection Methods with Polyurethane Grouts and Epoxy Resin: I "Characteristics and Properties" 1. Polyurethane Resins 2 . Epoxy Resins 1 Pumps Remark III "Procedures" 1 General Information 2 Water Stop Injection Methods 3 Sealing Expansion Joints and Wide Cracks IV "Safety"
Introduction Concrete often cracks. It is universally recognized and experienced. Concrete construction requires construction joints and cold joints. All of these wanted and unwanted openings in concrete structures may cause very serious problems. One of them is water leakage. Freeze/thaw damage and corrosion of rebars resulting in structural weakness and even failure can all be attributed to cracks and water infiltration. Now most of these problems can be economically resolved utilizing the WEBAC Pressure Injection System. It has been proven to accomplish two major purposes: one is to stop water leakage permanently, and the other is to maintain or even restore design strength. Slabs on grade, construction or control joints, parking garages, manholes, tanks, dams, and many other structures can now be fixed permanently. A new preventive measure that is superior over any other cold joint sealing method is the WEBAC 2000 Inject Tube System. The injectable tube is designed to control water problems in new construction from the beginning. The poured in place system can be injected when necessary. The WEBAC Injection System is extremely versatile by supplying supreme materials and equipment for the two most advanced procedures in concrete repair.
Injection Methods with Polyurethane Grouts and Epoxy Resins:
I CHARACTERISTICS AND PROPERTIES
1. POLYURETHANE RESINS
1.1 WATER LEAKAGE THROUGH CRACKS IN CONCRETE Epoxy injection resins usually fail in stopping active water leakage because of their slow reaction time and inability to bond to wet surfaces; this failure is resolved with the WEBAC Polyurethane System. The actively flowing water will be stopped by injecting WEBAC 151/157 which reacts quickly with the water to form an expanding foam. The final product is a semirigid or flexible closed-cell and strong bonding seal. To control the speed of the chemical reaction a certain percentage of a accelerator is added. The amount of accelerator added allows to control gel times between a few seconds and several minutes.
1.2 COLD JOINTS, EXPANSION JOINTS, WORKING CRACKS In spite of all the best efforts of engineers, architects and contractors, structures develop cracks in unanticipated places. When the structure settles and any movement finally stops, the crack becomes stable. Most cracks, however, continue to “WORK” due to several influences such as thermal or stress induced forces and soil moisture changes. Crack movement usually occurs in cycles. Cracks contract and expand periodically over time, which may be as long as a year or as short as several hours. Since most structures experience periodic movement, rigid crack repair materials often fail or cause other cracks in areas nearby. Therefore, even if water infiltration was successfully stopped initially, the ongoing movement of the structure might cause a new failure. The WEBAC Flexible Polyurethane Injection System was designed with these problems in mind. It has been proven to be of superior quality and unique in its completeness in the injection industry. WEBAC 151/157 and the WEBAC 1400 Resin Line have been designed for leakage repair in problem areas such as expanding and contracting cracks, expansion joints and cold joints. WEBAC polyurethane resins form a flexible gasket in the defective concrete, thus stopping the leak and tolerating movement of the structure. Very fine cracks may require very low viscosity non-foaming polyurethanes. For these applications WEBAC supplies gel-time adjustable resins of the WEBAC 1400 line. (1403)
1.3 ADVANTAGES OF THE WEBAC 151/157 AND WEBAC 1403 POLYURETHANE SYSTEM - Negative side application possible
1.4 HYDROPHILIC GEL INJECTION Hydrophilic Gels, like the WEBAC Flexgel, are an important alternative to the hydrophobic materials as described above and typically used in applications involved with soil. Flexgel is capable of incorporating water in amounts up to 20 times of it's own volume by forming a flexible gel. Smaller amounts of water result in a stronger gel and even less water between a 3:1 and a 1:1 ratio creates a foam. Hydrophilic polyurethanes are moisture sensitive after they are cured, and gel that is objected to a dry environment may experience some shrinkage due to evaporation of water. Gels may swell again later in a moist environment. Since postcure shrinkage can not be completely avoided in a dry situation, it is not recommended to use hydrophilic grout in crack injection when there is a chance that those cracks may dry out completely. Flexgel is designed to work behind the structure in combination with the surrounding soil. Since the material can be premixed with water by using a multi ratio pump, the mixed material is extremely low in viscosity and penetrates most soils rather well. The resin also fills the space between the structure and the soil thus creating a 'curtain' that functions as a waterproof membrane. This curtain injection can be done from the inside (negative side) by drilling through the structure in a pattern and injecting the resin from the inside out into the soil or the space between the structure and the soil. Applications are below grade structures such as parking garages, basements, manholes, dams, and so forth. For further information on gels please refer to our Flexgel data sheet. The WEBAC staff will be happy to assist you in deciding which products to use based on your application and needs.
2. EPOXY RESINS
2.1 INJECTION TO ACHIEVE STRUCTURAL STRENGTH Semi-flexible and flexible sealants are usually the best solution for crack and joint related problems. Nevertheless there are conditions where structural repair is necessary and specified. Structural strength is achieved by using WEBAC 4110/4111 epoxy injection resins. Due to the unique properties of the WEBAC 4040 slv (super low viscosity) and WEBAC 4110 epoxy injection resins, it is possible to inject this resin deeply into concrete joints, hairline cracks and fissures. WEBAC epoxy resins provide very high bond and compressive strength, and can restore cracked concrete to a complete monolithic piece. Depending on the job, injection can be done with low pressure and high pressure systems. Low pressure systems commonly utilize ‘glue on’ surface ports. High pressure injection is characterized by the use of mechanical packers. The low pressure injection method is more popular in epoxy resin injection and usually achieves good results. Although most epoxy injection can be performed with single component polyurethane injection equipment, it is recommended to use specialized epoxy injection gear to meet the specific material properties. Since the premixed epoxy reacts within a certain gel-time just by itself, it is advised to use two-component pumps with a static mix head to prevent premature reaction in the pumping system. While small batches of premixed material can be closely observed, it is essentially impossible to prevent mishaps and premature curing on the larger scale of a complex job. The two-component set up will give the contractor peace of mind and less aggravation when cleaning the system. The components are completely separated before mixing in the static mixer, therefore the pump and pressure hoses require less cleaning maintenance. The delivery lines from the mixer have to be flushed, and the mixer itself can be easily replaced if necessary.
2.2 ADVANTAGES OF THE WEBAC 4040 EPOXY INJECTION SYSTEM - Negative side application possible
II INJECTION EQUIPMENT
1 PUMPS The right injection equipment is important to get the job done right. The equipment does not necessarily have to be elaborate or expensive, it just has to be adequate. Epoxy injection should be done with specialized two-component pumping equipment. (Single component pumps may work for small jobs) In general, pressures between 200 and 600 psi are sufficient. If surface of the area to be injected is, in most cases, dry then surface ports are installed. Epoxies do not react with moisture in the crack and therefore do not thicken for a period of time. This is one of the reasons that lower injection pressures are generally acceptable. High pressure injection and injection in wet areas can also be done utilizing "polyurethane injection methods", holes are drilled and mechanicals packers are installed. Polyurethane injection is usually done with single component equipment. Dual component pumps may be used if available. The two criteria for injection pumps are the injection pressure and the quantity of material it is capable of moving. We recommend a minimum of 1000 psi pressure. This may seem to be excessive, but our competitively-priced, hand-operated pumps already create 1500 psi with very little effort. It is a myth that pressures of 300 psi are sufficient to do every job. In wide cracks and joints, pressures up to 300 psi may be enough to keep the material moving, however almost every hairline crack injection requires pressures of 1000 psi or more to produce satisfactory resin flow and adequate penetration. Polyurethanes are generally water reactive. As soon as the product comes into contact with a certain amount of moisture it starts a chemical reaction which results in increased viscosity (thickness). Increasing material thickness and the presence of hydrostatic pressure are reasons for high injection pressures needed. The injection pressure has to be high enough to push the gelling product into the voids and fine fissures against the hydrostatic pressure and against the pressure created by the reacting material itself. Only high injection pressures can guaranty the success in many cases. This is one of the reasons why WEBAC does not yet support cartridge systems for polyurethane injection. Cartridge systems that have been introduced to WEBAC just do not create pressures high enough to ensure proper installation of the chemicals. Incomplete penetration of resin is the number one cause of failure. Time, money and reputation are at stake. Also, initial savings, if any, are not substantial. The 'cartridged' material is comparatively expensive. A solid hand pump and quality accessories seem to be a more economical and professional investment. An electric alternative to cartridge systems is the small and convenient P1001injection pump. Don't be misled. While there are applications for cartridge injection, polyurethane foam injection in areas of hydrostatic pressure is not one of them. Future developments of cartridge systems may bring us a reliable system. The maximum volume of material that a pump is capable of putting out, seems to be of lesser importance than the pressure. Most jobs can be done with very affordable equipment. High volume pumps may be advised for major tunnel and dam repair jobs where large quantities of high pressure water have to be stopped. WEBAC supplies single and dual component, electric and hand-operated injection pumps in various price ranges.
2 SURFACE PORTS and MECHANICAL PACKERS In order to inject the resin into the crack, it is necessary to install injection ports which are also called mechanical packers or just plain packers. While it is common to use "glue on" surface injection ports for low pressure epoxy injection in dry areas, it is recommended to use packers for polyurethane injection and high pressure epoxy injection. Surface ports are usually glued to the surface with an epoxy gel such as WEBAC 4500. The crack surface should be buttered using the same gel to contain the injected material (epoxy). Surface ports are common in epoxy injection and they are an important and economical alternative to packers in low pressure and dry epoxy injection (WEBAC SPP, EPP). However there is a disadvantage: surface ports will not stick to wet surfaces and they do not tolerate injection pressures above several hundred psi. Quite the opposite is true with mechanical packers (picture from our Korean catalog). They are made for pressures up to 5000 psi and wet structures. Good quality packers should be made of metal and an expandable rubber sleeve. A medium soft, slightly rough rubber provides the best grip and spalled concrete and blown out ports are very rarely experienced. Packers made of cheap plastic are inferior by design, and they are not recommended for the following reasons. The plastic sleeve does not allow a grip similar to the rubber sleeve and the conic screwlike shape of the port won't create an equal force on the walls of the drilled hole. Even worse, since the conic shaped plastic packer does never really fit the drill hole, the pressure created by the installed packer will be located towards the opening, which results in concrete spalling and packer blow outs. The uneven grip of the conic plastic packers currently on the market cannot compete with the even grip of a true metal-rubber type port that evenly fits and expands towards the surrounding concrete. A snug and reliable fit of the packer is essential for the safety of the technician, and is an important factor for successful injection work. The size of the packer selected depends on the volume to be pumped and the pressures to be applied. Most frequently used diameters are 1/2 inch and 5/8 inch. Smaller diameters need smaller holes which results in less intrusion into the integrity of the structure and therefore is recommended. The 1/2 inch packer seems to be the best compromise in strength and size. Ninety per cent of the jobs can be accomplished with a 1/2 diameter packer like the WEBAC 13-60s. WEBAC provides mechanical packers and surface ports in various styles and sizes for residential basements as well as dam and tunnel injection. REMARK Field conditions and installation techniques for injection chemicals vary widely, Contractors must determine the suitability of the product and methods of installation for their particular use. By experience we know that one type of material cannot do everything, and therefore the WEBAC product line consists of several products with unique characteristics to enable the contractor to accomplish the job. This prospectus is an introduction and cannot mention all the procedures and WEBAC products available. Please make use of our detailed product information and technical assistance.
III PROCEDURES
1. GENERAL INFORMATION The WEBAC Pressure Injection System can be used for injecting cracks, cold joints, expansion joints and for soil stabilization. The system can be used to stop gushing water, to seal minor seepage, to regain structural integrity and to waterproof and strengthen almost any concrete or masonry structure from the positive or negative side, below grade, above grade and under water. This versatile system is used to solve problems in small residential objects as well as problems in major commercial structures. The system includes epoxy injection techniques as well as polyurethane injection techniques. Since the low pressure injection techniques that utilize 'glue on' surface ports are more commonly known, the following introduction focuses on the high pressure injection in conjunction with mechanical packers. Mechanical packers eliminate many problems of the surface ports including bond failure at pressures above 300 psi and inaccessibility in wet, and water pressured areas. High pressure injection through mechanical packers opens a new dimension of possibilities to solve joint and crack related problems. WEBAC supplies resins and equipment for low and high pressure injection, surface port and mechanical packer injection methods and systems. If you do not find answers to your specific questions in this prospectus, please call our office at 714-662-4445 and we shall be happy to assist. Also visit our new internet server at http://www.webac.com. There are some standard procedures that can be followed on most jobs. The following is a short introduction. It is recommended to inject at a time when the cracks or joints are at the widest aspect of their moving cycle. The reason is that sealants perform better in compression than in tension. This is of great importance when extreme movement is expected. Water tanks are a good example, since the crack movement is usually significant and in relation to the water level. Whenever possible, we recommend the injection of water tanks while filled rather than drained. While filled the cracks in a concrete tank are open, which allows good penetration of the injection resin. In addition to the good penetration, the material won't experience any tension, since the cracks are already at the widest aspect of their moving cycle. Should the water level decrease, or the tank be drained completely, the sealant in the cracks will be in compression and a failure is very unlikely. Besides crack injection it is also possible to inject polyurethane grout to the back side of a wall into the soil thus creating a grout curtain. This procedure is necessary when well defined cracks, joints or openings of any kind cannot be detected but moisture infiltration is evident. Another option is injection of the void between the structure and an existing membrane that had initially been installed to prevent water leaks, but failed. Membrane failure is a common cause of below grade water leaks. To the dismay of any engineer, it often occurs on brand-new buildings. The WEBAC Pressure Injection System has been proven to be a superior system in correcting those failures with ease by injecting from the negative side. No digging is necessary. Voids in the structure can be sealed, defective membranes can be fixed and even water pockets behind the structure can be effectively filled to minimize hydrostatic pressure. The injected soil will be compacted and stabilized thus reducing water accumulation behind the structure and shifting of loose soil. Extensive soil injection can prevent land slides and therefore minimize stress on the foundation. The number of practical methods that have been established over the years is endless. The Pressure Injection System has been proven to be extremely versatile, reliable and economical in resolving water related and structural problems.
2. WATER STOP INJECTION METHODS
2.1 SEALING CRACKS AND JOINTS The basic steps for the injection procedure are: 1. Clean surfaces
STEP 1 - CLEAN SURFACES Cleaning of the surface helps the technician to identify the exact location and the width of the crack to be injected. Sometimes the concrete surface is hidden under a surface of mineral deposits left from long-term water leakage. Items that obscure the crack should be removed, because the crack must to be seen clearly in order to layout the drilling patterns for the injection holes.
STEP 2 - DRILLING INJECTION HOLES In order to inject the resin into the crack, it is necessary to install injection ports, also called mechanical packers or just packers. While it is common to use ‘glue on’ surface injection ports for some low pressure epoxy injection in dry areas, it is recommended to use packers for polyurethane injection and high pressure epoxy injection. Surface ports will not stick to wet surfaces and they do not tolerate high injection pressures. Quite the opposite is true with mechanical packers. The metal-rubber type packers are made for pressures up to 5000 psi in wet and dry structures. Before drilling the injection holes, locate rebar and conduit, and plan the pattern to minimize damaging the bit during drilling. It is advisable to use a high quality rotary hammer. The diameter of the average injection hole shall be 1/2 inch (13 mm) or 5/8 inch (16 mm) depending on the packer used. WEBAC supplies packers in several diameters and lengths. The angle while drilling should be approximately 45 degrees or less to the surface and towards the crack. The depth of the drill hole intersecting the crack should be somewhere close to the middle of structure, if possible. Holes deeper than 18" are usually not required even if the concrete being repaired is more than 36 inches thick, as long as adequate pumping pressure is available and material is contained during injection. Holes should always be staggered from one side of the crack to the other. This assures a higher percentage of holes intersecting the crack, even if the angle of the crack within the concrete is not perpendicular to the surface. No two cracks behave just alike. In some instances a crack will fill from just a few injection packers. The distance of the drilled holes to each other usually varies from approximately 6 to 20 inches according to the width of the crack. (Rule of thumb: 1 foot) The wider the crack, the further apart are the drill holes. Experience helps in deciding how far apart to drill the injection holes. If the concrete thickness is 6 inches or less, do not attempt angle drilling, set the packers straight into the face of the crack. This will help to minimize spalling in these concrete sections.
STEP 3 - INSERT INJECTION PACKERS Place packers in the previously drilled hole, so that the top of the rubber sleeve is below the concrete surface. If the packer can't be pushed into the hole, tap it in. Tighten the packer with a wrench as tight as necessary. For critical areas such as corners and badly deteriorated surfaces, WEBAC supplies long versions of the regular packers to allow a deep insertion of the expandable rubber sleeve.
STEP 4 - FLUSH CRACK IF NECESSARY In some circumstances, it can be very useful to flush the crack with water to improve the subsequent penetration of the WEBAC injection resin into thicker walls. Flushing helps to detect blind drill holes, or lost continuity of a crack. The procedure starts at the lowest packer on a vertical crack, or at the narrowest part of a crack of a horizontal surface and proceeds from packer to packer in sequence. During flushing, it is advisable to disconnect zerk fittings from packers that are not connected to the pressure line and thereby creating an exit for surplus liquid. After completion of flushing, prepare for the resin injection. Flushing is not advisable for epoxy injection.
STEP 5 - CRACK INJECTION When all preparation work is completed, make sure the injection pump is in good working order. All equipment that comes in contact with the chemicals must be absolutely dry. Always remember that polyurethanes are water reactive. This will save a lot of valuable time on the job. Choose the proper resin for the correct application. The nature of the crack/joint and the conditions at the job site determine the choice of material. Active water flow at a high rate is best stopped by using WEBAC 151. Moving cracks and expansion joints should be injected with WEBAC 157. Hairline cracks and dry cracks should be sealed using WEBAC 1403/1440. Some problems are solved by using a combination of products. A major water leak through an expansion joint for example, can be initially stopped with WEBAC 151. To achieve flexibility, WEBAC 1403 or WEBAC 157 can be injected right afterwards. Please consult the product catalog, observe data sheets for details, and don’t hesitate to call for technical support. We want you to do the job right. Mix resins in accordance with manufacturer’s specifications and recommendations. Load the resin hopper and charge the pump, hose, and gun. Open the valve on the gun, and allow all remaining solvent to pass while watching for the resin to appear. Catch all surplus material and solvent in a waste container and please observe state and federal regulations. Keep the hopper covered in wet environments, especially if it is raining or water is dripping from the ceiling in an enclosed environment. The technician should be carefully watching three points of reference: 1. The crack /packer- for resin flowing out of the work face Begin the injection at the point of highest resistance to ensure good penetration and minimal loss of chemical. This is usually the lowest point on a vertical crack and the narrowest area on a horizontal surface. First, fill the drill hole, then start slowly injecting the crack. Holding the pressure line allows the operator to feel the pump pulsations. The technician may tell from the hose vibration how well the material is flowing into the crack. If a pressure gauge is available, the pressure should be monitored and kept in a range that is just enough to allow sufficient flow of material. This procedure helps to minimize unforeseen events like sudden spills of material, blown out ports or spalling of defective concrete. If the crack surface exhibits immediate free flow of resin while working the first packer, pause for a few minutes. In most cases the resin (using WEBAC 151 or WEBAC 157) will react fast enough with the water and expand rapidly. The resulting resin product will heal the crack and provide a surface seal to contain the material to follow. After approximately three to five minutes start pumping again. If the resin continuous to flow freely out of the crack , stop pumping and apply a surface seal over the crack with rapid setting cement or place absorbent materials such as oakum or foam rubber soaked in the reactive grout until saturated. Use a screwdriver or similar to jam the soaked material into place and allow a few minutes to cure and pump again. When the soaked material comes in contact with water it starts to expand, creating a fast, permanent surface seal. Resin may still flow from pinholes in the patch, but do not be concerned as long as the majority of the resin is contained. A small amount of leakage is beneficial because it shows the extent of resin travel. Extremely wide cracks should be covered with a surface seal prior to injection in order to contain the resin until cured (see procedure for extra wide cracks). Under proper pumping conditions in active leak injection, the following signs should be observed in the order listed: 1. Water displaced from the crack by the resin It is helpful to disconnect the zerk fitting from the packers 'ahead' to allow free ‘port to port travel’. Procee d pumping until the resin has travelled to the next packer, and is oozing out slowly on the visible side of the crack. Once you are assured that the resin has reached the next injection packer, attach the zerk fitting. Shut-off resin flow, disconnect your pressure line and proceed to the next packer. After injecting a couple packers, return to the first packer and inject again. Some of the packers will take more grout, fillin g up more of the crack and creating a higher density crack filler. Some contractors reinject up to three times. Continue in this fashion until the crack is completely filled.
STEP 6 - CLEAN UP Once the injection work is completed, a good and thorough cleanup is essential, because once the resin hardens, it is almost impossible to dissolve it. Any resin spilled must be cleaned immediately before the resin sets. Clean your injection pump, mixers and any other tools that came in contact with the product thoroughly using WEBAC R70 Pump Flush or a solvent. A good thorough cleanup is time well spent, and will save you a lot of grief on your next project. The packers can be removed within 24 hours and the holes should be patched. If desired, an electric grinder can be used to remove excess cured grout that flowed out the crack.
3 SEALING EXPANSION JOINTS AND WIDE CRACKS WEBAC 157 is an excellent repair material for leaking expansion joints, wide cold joints, and extra wide moving cracks. The use of WEBAC 5560 rubber foam as a surface sealant is indicated in wide, mostly dry joints. WEBAC 157 is also very successful for repairing failed water stops. In the past, repairing joints was difficult, because an expansion joint is designed to move. Many products for stopping water are rigid and hard setting; such materials either break up and fall out over time, or they bond solidly and prevent the designed movement within the joint - thereby defeating its purpose and crating new cracks. Most flexible sealants on the other hand, require a clean, dry surface (or special surface preparation) to obtain a bond. These materials do stretch, but often fail to adhere, because of imperfect conditions during their installation. Expansion joint repair with the flexible closed cell grout WEBAC 157 takes full advantage of its ability to expand in confined spaces. The expansion of the reacting material allows the seal to stay in compression, rather than tension, therefore preventing bond failures. While injecting WEBAC 157, the concrete surfaces of the joint provide confinement on two sides. The outer confinement can be soil or a water stop. Confinement on the inner surface can be installed temporarily by a backer rod and hydraulic cement. Another method has been proven to be even more effective in very active leaks: strips of untreated oakum, foam rubber or other absorbent materials may be soaked in resin and packed into the joint recess. Such resin soaked strips are called “expanding gaskets”, the process is called “Expanding Gasket Placement”, E.G.P. for short. The resin reacts with the water to expand, and cures rapidly, thus forming a quick “molded-in-place” gasket seal. This inner surface, if desired, may be removed after injection. If a leak flows are at a very high rate, one or more pieces of small diameter pipe may be imbedded in the packing material. These diversion pipes serve to relieve pressure and divert flow while the packing seal solidifies. Once the seal has cured, a small amount of resin injected through the pipes will rapidly complete the seal. The pipe can then be removed. The following steps in sequence are recommended for a successful application. 1. Remove debris from joint surface
STEP 1 - REMOVE DEBRIS FORM JOINT SURFACE Clean away surface deposits and debris just as described for crack sealing work. With the smallest amount of extra effort, the end result will be the most effective seal possible, and the best-looking as well.
STEP 2 - REMOVE OLD OR FAILED SEALANT Old cement patches in expansion joints defeat the purpose of the joint. Complete removal, however, is usually difficult and may not be practical. All loose mortar, at least, should be removed, to allow enough room in the joint for the WEBAC 157 to be placed in sufficient quantity. Expansion joints are designed to move. At 50% elongation, 0.10" can become 0.15" while 1/2 can become 3/4". If a water stop is present, and its depth is less than eight inches, remove everything down to it.
STEP 3 - DRILL INJECTION HOLES AND INSTALL PACKERS Injection holes for expansion joints should be drilled in the same manner as for a crack. However, if a water stop is present in a depth of more than eight inches, best results are usually obtained by incorporating whatever is left of it into the new seal. Thus, injection packers should not pierce the water stop if full-depth penetration is not required; each hole should be angled to end just short of the water stop material.
STEP 4 - FLUSH INJECTION HOLES AND JOINTS Joint flush procedures are the same as outlined previously for cracks.
STEP 5 - APPLY JOINT SEAL BACKING, INNER JOINT SEAL Large volumes or heavy flows of water must be controlled during resin injection and cure. There are several materials and methods of control from which to choose. Some of the common choices are as follows: 1. Backer Rod
STEP 6 - WEBAC 157 INJECTION The procedure for resin injection in expansion joints is similar to the procedure outlined for crack sealing. However, any pressures much above the minimum required to open injection packer valves, will rarely be needed. In fact, special care should be taken so as not to rupture the outer seal. Begin injection at the lowest packer, and work your way up. Best results are obtained by methodically proceeding to the end of the joint without unnecessary interruptions. Continuity helps to assure uniform density and continuity of WEBAC 157 resin. Continue to pump each packer, until resin flows from the packer ahead, before moving up. When the last packer has been pumped, go back to the first packer, and work through the series again, adding a small amount of resin at each. Watch your outer seal carefully. After curing overnight, the expansion joint is “as good as new” and is ready for a long life of reliable service.
STEP 7 - CLEANUP As outlined previously in crack injection procedures.
IV SAFETY
Please be safety and health conscious! Technical data sheets, MSDS and container labels must be read and understood before working with the products. Good ventilation must always be maintained when handling resins and solvents especially in confined spaces. Working with high pressures also creates certain risks. Loose injection packers have been known to slip out of holes. Face shields, rubber gloves and coveralls have to be worn at all times while working with construction chemicals. Cured material is extremely resistant to chemicals and most solvents. Stains on clothing can usually not be removed.
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WEBAC Corp
1669 E WILSHIRE BLVD
SANTA ANA, CA 92705
Ph: 714-662-4445
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