Physical and mechanical properties of cement stone with superabsorbent polyacrylate solutions
The 3D-technology is becoming widespread in construction. Thus, the development of mixtures with the indifferent set of properties to the influence of the environment is actual. The intensive setting and hardening of cement composites in aggressive conditions require finding solutions to ensure the internal curing of concrete. One of the ways to ensure the internal curing of cement composites can be the using of special superabsorbent polymers (SAP). The formation in the structure of the mixture of thin films of polyacrylate SAP with a delayed polymerization of acrylic acids will provide the reserve of water in the system for hydration. Wherein the mobility of the mixture and strength of composite does not get lost in contrast to the granular SAP. The determination of the influence of the SAP components “Renovir-hydrogel” on the physical and mechanical properties of the cement stone is the main aim of this study. Standard test methods in accordance with Russian state standards for average density and total pore volume, EN 196-1 for kinetics of hardening are used in the work. It has been shown that the super absorbent polymer solutions with a controlled polymerization process can be used in cement composites to control water balance. The investigated SAP solutions allow increasing the average density and compressive strength of cement stone. The admixture of the SAP solutions in the studied range of variable factors leads to an increase in the strength of cement stone by 29.5%. An experimental statistical model describing the dependence of the compressive strength on the amount of catalyst and the ratio of water to polymer part was obtained. This allows for achieving the required characteristics of the composite.