Ultimately, the characteristics of the crack to be repaired should dictate the most suitable injection method. However, the crack injection technique requires some practice for the repair to be effective. . Surface defect up to 5mm Patching Sika Top 121 b. Break out the repair area to remove all contaminated or damaged concrete to a minimum depth of 10 mm, up to the pre-cut edge of the repair. Epoxy Low Viscosity Injection Resin Structured Method Statement for the Repair of Concrete I. Mix only sufficient material that can be used within the pot life of the material.
Structural reinforcement: some sealant manufacturers such as Sika provide seal or wrap-and-seal systems that actually provide additional strength to existing concrete structures such as concrete columns. The latest reading is 2. On the other hand, a small amount of moment in a foundation wall or floor slab due to changes in temperature will leave a flexible crack filler un-damaged and sealed where a rigid material may fail. When an injection has failed, it is logical to assume that there is residual injection material within the crack; this being the case, injected epoxy may not travel along the full length of the crack due to obstructions. Each crack shall be treated in a single continuous operation and sufficient material shall, therefore, be made prior to the commencement of the work. On this page: Comparison of the characteristics of epoxy and polyurethane Epoxy and polyurethane are referred to as resins; for the most part, both are two component formulations.
In the event that there is still a problem or error with copyrighted material, the break of the copyright is unintentional and noncommercial and the material will be removed immediately upon presented proof. The foreman monitors employees to ensure that the work is done efficiently and within quality standards. Some of these epoxy resin products are formulated for use as a high-friction surface or for use to repair spalled or chipped concrete surfaces. Immediately prior to application of approved material, the prepared substrate should be blown clean with oil-free compressed air. In case of a wall or slab which is cracked all the way through, packers shall be located on both sides with those at the back placed at midway points between those at the front.
Apply additional under coats in thickness not more that 10mm until obtaining required projection. We describe use of epoxy sealants, polyurethane foam sealants, and hydraulic cement crack repair sealants. It is demonstrated by the installation of plastic injection ports, placed directly on the crack. Steel troweling shall be delayed as long as possible and used only to eliminate the uneven points and to force aggregate particles into the plaster surface. For priming in other conditions, apply approved primer as per its current instructions.
Continue applying pressure until resin appears at the next packer location or until no more resin will enter the crack. Want more information on how foundation cracks are injected? Note 1: Several technical factors need to be taken into account to determine whether a basement leak should be injected using epoxy or polyurethane; for example, the effects of tension and compression at the crack location must be factored into the decision on how best to deal with your leak repair. Overlay expoxy resin coatings: used as a coating on concrete surfaces for skid protection or for patching damaged surface areas. Important Note This data sheet is issued as a guide to the use of the product s concerned. ® products are applied — accept any liability either directly or indirectly arising from the use of a.
To accommodate crack tension and compression we believe that polyurethane should cure with a rubber-like consistency. We recommend using backer rods also if sealing wide cracks in concrete walls or floors, but first you need to have those cracks evaluated to determine the cause as other important structural repairs could be needed first. If these materials are used to rebond cracked concrete that is subsequently exposed to loads exceeding the tensile or shear strength of the concrete, it should be expected that the cracks will recur adjacent to the epoxy bond line. The blending of the 2 components for each resin type creates a material with the requisite properties for professional crack injection repairs. On this page: The usefulness of polyurethane injection This type of injection sometimes referred to as urethane injection is arguably the most common type of injection used for repairing basement leaks and waterstopping generally, due to its versatility. Erected a maximum of 50 mm from the plate edge.
We have no relationship with advertisers, products, or services discussed at this website. Similarly, if a crack is full of mud, we would elect to inject the crack with polyurethane to take advantage of the crack flushing process associated with this injection method. Our question is - should we seal this crack with some time of sealer that could be painted on and would this be effective? Finished grooves shall be neat, of uniform width and depth, sharp straight edges and exact vertical and horizontal lines. Identify the nature of the crack and investigate the extent and magnitude of the crack by making a V-groove cut 25 mm deep along the crack line. In the event that the pressure is unable to reach a minimum of 2500 psi or exceed 3500 psi, you would get poor quality work and assured inefficiency. Further applications of the fresh compound may be applied once the intermediate layer has reached its initial set.
When all of the crack has been sealed except a single pressure relief point, that final leak is sealed with a molded plug of cement. Exposed steel reinforcement should be securely held in place to avoid movement during application, as this will affect the compaction, build and bond of the mortar. The pattern looks like shrinkage but the crack width is larger than normal shrinkage cracking. Note 2: Not all Waterproofing Contractors offer high pressure polyurethane injection basement leak waterproofing repairs. Similarly, a special product would be needed to fill a control joint in concrete in very cold weather.
Below are examples of additional applications of epoxy resins and sealants in construction: Anchoring epoxy products: used to inject into holes into which connectors such as bolts or post anchors will be placed. Form ties and other obstruction shall be removed or trimmed back even with the surface of the solid base. Mixing, Placing and Curing a. Often it will occur at right angles to the cracked plane. Twenty to 30 minutes should be a minimum.
Work Flow Chart Procedure Page 3 4. Multiple layers can also be used to achieve the desired thickness and profile but care must be taken to ensure consistency of inter-coat bond strength. We also provide a to this topic, or you can try the page top or bottom as a quick way to find information you need. Types of foundation cracks, crack patterns, differences in the meaning of cracks in different foundation materials, site conditions, building history, and other evidence of building movement and damage are described to assist in recognizing foundation defects and to help the inspector separate cosmetic or low-risk conditions from those likely to be important and potentially costly to repair. Other severe defects of concrete such as major deficiencies like exposed rebars and cavities, cold joints, re-profiling, retrofitting, major cracks, etc. Unless otherwise specified in the technical data sheets, curing shall be carried out for 2-3 days.