HIGH EARLY STRENGTH CEMENT CONCRETE

Abstract

The article analyzes the ways of obtaining high-strength concrete with high strength in the early stages. The influence of water-cement ratio in concrete and the degree of cement hydration on the acceleration of structure formation processes in cement stone is theoretically substantiated and experimentally confirmed. By calculation, using the structural criterion substantiated by Powers, which characterizes the concentration of cement hydration products in the intergrain space, it was found that at extremely low values ​​of W/C great opportunities to increase the strength of cement stone open with a relatively small increase in cement hydration. The results of research confirming the effect on the strength of cement stone at an early age of the fineness of cement grinding, as well as the reduction of W/C due to the use of superplasticizers with a high water-reducing effect. Experimental data show that an alternative way to increase the early strength in high-strength concrete by increasing the fineness of cement grinding is the integrated use of superplasticizers with hardening accelerators.