Low-carbon nanomodified rapid-hardening high performance concretes

Effective low-carbon nanomodified rapid-hardening high performance concretes (HPC) have been developed. It is shown that the introduction of complex nanomodifiers based on polycarboxylate ethers with nanodesigned chains and nanosized particles of C–S–H calcium hydrosilicates makes it possible to improve the cementitious matrix and the interfa¬cial transition zone. To ensure a high packing density of the aggregates, the granulometric composition curve is optimized, which provides increased workability and homogeneity of the concrete mixture. It is established that the alkaline activation of high-quality Portland cement CEM II/А-S 52.5 R and high-aluminate fly ash accelerate the kinetics of concrete hardening. Nanomodified HPCs, characterized by the increased early and standard strength, density, improved technical properties, are obtained.