How to apply polyacrylamide in cement concrete?
Adding polyacrylamide to cement mortar, polyacrylamide particles can fill holes, and polyacrylamide membrane can also close holes, so polyacrylamide is an effective way to solve the problem of impermeability of ordinary concrete and cement mortar. At the same time, polyacrylamide can also significantly improve the fluidity, water retention, adhesion to the substrate, water tightness, durability, chemical corrosion resistance, freeze-thaw resistance, mechanical strength and elongation performance of cement-based materials.
- The advantages of polyacrylamide in cement concrete
Adding polyacrylamide to concrete can reduce the brittleness of concrete, improve its flexibility, increase shrinkage, and can greatly enhance the flexural strength, interlayer bond strength, durability and bending toughness of concrete compared with ordinary concrete. The flexural tensile capacity, bonding performance, durability and flexural toughness have been greatly improved. Another point is that polyacrylamide can enhance the impermeability of concrete. Relevant data show that the permeability of concrete added with polyacrylamide is improved. The magnitude exceeds 90%, and the bond strength between concrete layers is also nearly 4 times higher than ordinary.
- Application mechanism of polyacrylamide in cement concrete
- Polyacrylamide can improve the working performance of cement mortar or cement concrete and reduce the water-cement ratio;
- The latex particles in the polyacrylamide emulsion deposit or condense on the surface of hydrated (or slightly hydrated) cement and aggregate, and form a thin film, which will eventually form an interpenetrating network structure with cement hydration products . The incorporation of polyacrylamide has an effect on the cement hydration and cement hardening process, and the chemical interaction between polyacrylamide and cement or hydration products occurs;
- When the relative humidity drops below 100%, the cement shrinks and generates a certain amount of stress. At this time, the cured polyacrylamide modified cement can form microcracks to release the stress;
- The development of cracks meets the interpenetrating polyacrylamide network, and microfibers are formed within the entire polyacrylamide network, so the development of cracks is terminated;
- The addition of polyacrylamide causes changes in the structure of cement stone, changes the pore structure of concrete, improves the bonding between cement paste and aggregate, and reduces microcracks in hardened cement paste. The above effects all improve the physical and mechanical properties of cement-based materials.
Polyacrylamide is widely used as a concrete external additive, which can improve the interaction between concrete particles, thereby increasing the strength and toughness of concrete. The application of polyacrylamide in concrete, putty powder, mortar king and other building materials has been widely promoted. It mainly plays the role of flocculation, water retention, thickening, adhesion, lubrication, etc. In addition, polyacrylamide has a good water retention effect in other building materials due to its ultra-high viscosity and its special molecular structure. It is commonly used as a thickener for putty powder, a binder for refractory materials, and a thickening and water-retaining agent for mortar.
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