Leakage of water through cracks of concrete is a frequent, and annoying issue. Surface patches can temporarily prevent water, but they tend to fail since the leak persists behind the surface patch. PU injection grouting is a permanent solution. PU is an abbreviation of polyurethane, a multi-purpose polymer, which reacts with water and enlarges forming a flexible waterproof seal within cracks. This method injects a liquid polyurethane resin into the cavities and cracks with the help of a special pump. After entering, the resin expands and seals all the gaps, preventing even active pressurized leakages.
Nantong Yuru Engineering Materials Co., Ltd. is a high-tech company with more than 20 years of experience in producing high-quality Injection Grout (PU-based) and precision Grout Pumps. We describe all you should know about PU injection grouting below.
How PU Injection Grouting Works: The Basic Principle
PU injection grouting is easy and very efficient. The initial step is to drill small holes in the crack direction and inject the packers (ports). Afterward, controlled pressure injections of liquid polyurethane resin are made using a Grout Pump. The resin goes far into the crack network. On coming in contact with water, a chemical reaction takes place. Hydrophilic (water-loving) PU grout swells up instantly, many times its volume, and fills all the voids and micro-cracks. Hydrophobic (water-repelling) PU grout reacts also, forming a solid, flexible plug. The resin hardens into a strong and flexible foam or solid, which sticks to concrete firmly within a few seconds to minutes. The outcome is a watertight permanent seal that moves with the structure.
When to Use PU Injection Grouting: Common Applications
PU injection grouting is the most desirable method of active water leaks and cracks of below-grade structures. Examples of common uses are basement walls that are seeping with ground water, cracks in concrete foundation, tunnel walls and tunnel structures, elevator pits and manholes, underground parking garages, water tanks and reservoirs, bridge substructures and retaining walls. To achieve shallow protection in roofs, decks or open spaces, Nantong Yuru suggests our Waterproof Coating or Waterproof Membrane. Our Polyurethane Polysulfide Sealant works well in the joints which need a flexible and surface-applied seal. However, in the case of actively flowing water and passing through a crack, there is no other method, except PU injection grouting, which is sure.
The Equipment: Why a Quality Grout Pump Matters
The equipment used is vital in ensuring successful grouting of PU injection. A poor-quality pump can provide uneven pressure, will not reach deep cracks, or it will be clogged when in use. Grout Pump by Nantong Yuru is a professional pump. It offers adjustable, high pressure production to press PU grout inside hairline cracks as slender as 0.2 millimeters. The pump is easily cleaned and maintained, and has durable parts that can accommodate hydrophilic as well as hydrophobic resins. Combined with our Injection Grout, this system will ensure full crack fill in one injection, eliminating the need to have to inject multiple times or waste time on your work site. In case of large projects, several pumps may be operated at any given time in order to maximize the efficiency.
Advantages of PU Injection Grouting Over Other Methods
There are various benefits that PU injection grouting has over conventional waterproofing techniques. To begin with, it prevents active leaks even in the presence of hydrostatic pressure, but surface finishes will merely blister and peel. Second, it is minimally invasive- small holes are drilled thus maintaining the structural integrity of the concrete. Third, the repair is a part of the building itself and is flexible to move and flex with the building as temperatures vary or settlement takes place. Fourth, it is economical to do specific repairs as opposed to digging and removing and replacing portions of concrete. Paint or cementitious patches applied on the surface are unable to resist water that acts behind. Epoxy grout presupposes a thoroughly dry surface, and it is brittle with time. Shrinkage and cracking of cementitious grout. PU injection grouting in itself is elastic, clings well and is still able to seal even when the crack shifts a bit. To maintain full protection we usually suggest PU injection grouting be used with our Floor Paint or Waterproof Coating to finish the surface, but as far as the leak itself is concerned, there is no quicker or more permanent method to use.
Why Choose Nantong Yuru for PU Injection Grouting?
Nantong Yuru Engineering Materials Co., Ltd. is a company founded in 2003, located at a strategic place at the border of Nantong, Yancheng, and Yangzhou, where sea, land, and air transportation is easy. Our capital is 81.88 million yuan, a modern plant with an area of 16,888.68 square meters, and an annual production of 15,000 tons of waterproof materials. We became the first in our industry to be certified with ISO9001, ISO14001 and CE. We are also second-level qualified with waterproofing contracting and have been awarded several national and building materials industry awards. Taking our Injection Grout and Grout Pump, you are choosing a system with decades of experience, with stringent quality control and with complete on-site construction support. Get in touch with us to permanently eliminate your water leaks using PU injection grouting.
