Influence of Superplasticizer-Microsilica Complex on Cement Hydration, Structure and Properties of Cement Stone

[摘要] According to the study results, the influence of complex additives based on microsilica and superplasticizers on the processes of the heat release, hydration, hardening, formation of the structure and properties of cement stone was determined. Calorimetry, derivatography, X-ray phase analysis, electronic microscopy and physical-mechanical methods for analyzing the properties of cement stone were used for the studies. It was established that plasticizing additives, in addition to the main water-reducing and rheological functions, regulate cement solidification and hardening while polycarboxylate superplasticizers even contribute to the formation of a special, amorphized microstructure of cement stone. In a complex containing microsilica and a polycarboxylate superplasticizer the strength increases sharply with a sharp drop in the capillary porosity responsible for the density, permeability, durability, and hence, the longevity of concrete. All this is a weighty argument in favor of the use of microsilica jointly with a polycarboxylate superplasticizer in road concretes operated under aggressive conditions.

[发布机构] Department of Building Materials and Products, South Ural State University (National Research University), Lenin Ave., 76, Chelyabinsk; 454080, Russia^1

[学科分类] 土木及结构工程学

[关键词] Capillary porosity;Cement solidifications;Electronic microscopy;Mechanical methods;Polycarboxylate superplasticizer;Rheological functions;Structure and properties;X-ray phase analysis