![PU GROUTING FUNDAMENTALS
Grouting with polyurethane [PU] resins represents an
effective method of improvement of mechanical and
sealing properties of soil and rock environment and
constructions. The principle of grouting technologies is
injection of liquid grouting material into the rock
environment or construction under pressure. During the
grouting process, fissures and pores are filled with the
grouting material, which subsequently hardens and
connects the disintegrated parts of the rock mass or
grains of loose material.](https://image.slidesharecdn.com/basementhowtoavoidewaterentry-230212124411-6d8568dc/85/Basement-how-to-avoide-water-entry-pptx-9-320.jpg)
![PU grouting resin types
PU grouting materials can be divided according to their
chemistry to three main groups:
two-component (PU) organic resins:
component A polyol in mixture (polyetherpolyol, catalysts,
additives),
component B isocyanates in mixture (methylene diphenyl
diisocyanate [MDI], homologes,
isomeres).
After curing they form solid PU resins or foam.](https://image.slidesharecdn.com/basementhowtoavoidewaterentry-230212124411-6d8568dc/85/Basement-how-to-avoide-water-entry-pptx-12-320.jpg)
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Basement how to avoide water entry.pptx
- 1. Basement how to stop water entry
- 2. Ways of water entering in a building Water can enter your basement two ways: as liquid water or as a gas, called water vapor. Both are important and can cause a variety of problems if ignored by builders. Water vapor. there is a lot of water vapor in the soil, In fact the relative humidity of the soil is 100%. water vapor travels easily though concrete Liquid water. Where foundation drainage is inadequate or the water table too high, liquid water can build up around the foundation and exert hydrostatic pressure, forcing itself through any small opening and into the concrete itself.
- 3. characteristic of concrete Concrete may be hard as rock and unaffected by moisture, but it readily absorbs liquid water through porous hole like membrane Damproofing The thin layer of asphalt applied to most foundations is called dampproofing. The purpose of dampproofing is to slow down the transmission of water vapor through the concrete walls into the building If you backfill with a well-drained, granular material next to the foundation wall, then dampproofing will do a reasonably good job of keeping water vapor from entering porous to water vapor.
- 4. Damper proofing with asphalt
- 5. Waterproofing most start with a heavy spray-on elastomeric coating that can bridge cracks and keep out water Dimpled membranes: These are plastic sheets with the dimples facing into the wall, creating about a 遜 inch gap for drainage Widely available Air-Gap Waterproofing Membrane, Its important to select a product with adequate compressive strength Matrix panels: These form the air gap by using a tangle of thick plastic fibers. The best available with filter fabric on one or both sides and uses 40% to 50% post recycled material.
- 6. Footing Drains Drains around the foundation perimeter should be an essential part of every basement waterproofing system. The best product to use for footing drainages rigid PVC drain pipe with small holes drilled in two or three rows. prefer Schedule 40 pipe the same thing used for plumbing drains Remember, the holes face downward when installed! That way, rising water flows into the pipe and away from the footings.
- 8. Water leak arresting for building in operation If the following are not done properly the following options to be tried proper drainage to be done Slope to be given to get the water out of the building any seepage holes found visible to be arrested water proofing plastering to be done once again if nothing works out PU grouting is the only option to be followed Go through the comments shared by Mr.Steven Bliss, BuildingAdvisor.com
- 9. PU GROUTING FUNDAMENTALS Grouting with polyurethane [PU] resins represents an effective method of improvement of mechanical and sealing properties of soil and rock environment and constructions. The principle of grouting technologies is injection of liquid grouting material into the rock environment or construction under pressure. During the grouting process, fissures and pores are filled with the grouting material, which subsequently hardens and connects the disintegrated parts of the rock mass or grains of loose material.
- 10. PU usages in civil construction strengthening of subsoil (also under groundwater level) securing of stability of structures threatened by mining construction works strengthening of brick or stone masonry restoration of insulation of structures sealing of utility entries into constructions sealing of joints stopping of water inflows into constructions and etc.
- 12. PU grouting resin types PU grouting materials can be divided according to their chemistry to three main groups: two-component (PU) organic resins: component A polyol in mixture (polyetherpolyol, catalysts, additives), component B isocyanates in mixture (methylene diphenyl diisocyanate [MDI], homologes, isomeres). After curing they form solid PU resins or foam.
- 13. Grouting technology Mixing of the PU mixture is made in mixing chamber, which is located behind the pump of the grouting resin from separate tanks or the components flow in gravitationally. pump takes the components in appropriate ratio and delivers them separately to the mixing chamber. In the mixing chamber, components are mixed and subsequently injected through the packer into the rock mass. The resin penetrates under the pressure into surrounding fissures and cavities up to the distance of a few meters from the borehole. As a result sealing and strengthening of the rock mass or construction is achieved.
- 14. Thank you
Editor's Notes
- #9: Hello Dayasagar, 油 Before undertaking any efforts to seal basement leaks, its best to start with an assessment of surface drainage. If you can redirect some or all of the surface water flowing toward the foundation, you can often reduce or eliminate leakage into the basement. Sometimes the solution is as simple as redirecting water from gutters and downspouts to a safe distance away from the building. 油 Where sealing foundation cracks is necessary, its best to seal the exterior where that is an option. Typically, contractors will install an exterior waterproofing membrane and may install or repair the foundation footing drains to direct any subsurface water away from the foundation walls. 油 However, exterior excavation is often too expensive or may be impossible due to limited access for example, adjacent properties are too close. Also the disruption to landscaping, planting, paving, and decks and porches can make exterior excavation expensive and unappealing. 油 The most common approach to interior sealing is injection with epoxy or polyurethane foam. The approach is determined by the size and characteristics of the crack, whether the crack is stable, and whether it is actively leaking. 油 If the foundation is unstable and still shifting, structural repairs will need to be done before any waterproofing. Where the sealed crack needs to be as strong or stronger than the surrounding concrete, 油epoxy is often the best option. Where the crack if fully stable and the only problem is water leakage, polyurethane foam can be very effective. Where the leak is active with flowing water, contractors typically drill holes to inject polyurethane deep into the crack to stop the water flow. Otherwise, flowing water can dilute the sealant and impair its performance. Once the crack is dry, the contractor can use either polyurethane or epoxy. Some polyurethanes use moisture to cure, while others need a dry substrate. Modern dual-cartridge systems have made injection of epoxies and urethanes easier and more affordable. 油 Where the water flow cannot be stopped, hydraulic cement or similar fast-set grouts are sometimes used. Hydraulic cement expands as it sets, plugging difficult leaks. Ultra fast-set grouts are proprietary formulations that bond chemically to the concrete. 油 The specific product used will depend on the site conditions and preferences of the contractor. It sometimes pays to have an independent third-party typically an engineer -- spec out a solution. 油 Whatever approach you choose, always get a guarantee in writing that the leakage will be eliminated. The expertise of the contractor is usually more important than the specific product used. Look for someone with extensive experience with the type of leakage you are experiencing and check their references. 油 Best of luck! 油 Steve 油 Steven Bliss, Editor & Publisher BuildingAdvisor.com