Hardening accelerator composition for cementitious compositions, cementitious composition and process for accelerating the hardening of a cementitious composition

Abstract

A hardening accelerator composition for cementitious compositions comprises a C—S—H seed component comprising a finely dispersed mineral constituent stabilized by a polymeric water-soluble dispersant, the mineral constituent comprising a semi-ordered calcium silicate hydrate having an apparent crystallite size of 15 nm or less, and an alkanolamine selected from diethanolamine (DEA) and methyl diethanolamine (MDEA), or mixtures thereof. The hardening accelerator composition allows for a greater hardening acceleration and promotion of compressive strength development of cement than either agent alone. Said improvement in compressive strength is favorable in view of reducing the amount of cement or to improve production efficiency accompanied by reducing production time.

Dependencies are inferred from the claim text.