Modified fine-grained concretes based on highly filled self-compacting mixtures

[摘要] In this article the results of study of rheo-technological characteristics of cement-carbonate suspensions and physical and mechanical characteristics of cement composites from highly filled self-compacting mixtures are presented. The optimal dosage of polycarboxylate superplasticizer (Melflux 5581 F) and rheologically active mineral filler (microcalcite) in cement-mineral suspensions when developing self-compacting fine-grained concrete mixtures is defined. The water demand of fine natural quartz sands using the methodology of Skramtayev and Bazhenov is studied. The compositions of self-compacting fine-grained concrete mixtures of workability class SF1 with fine natural quartz sand are developed. High physical and mechanical characteristics of fine-grained concretes from highly filled self-compacting mixtures are fixed: density in normal humidity conditions at the age of 28 days up 2393 kg/m3; bending and compressive strength at the age of 28 days up 14.9 and 115.8 MPa, respectively.

[发布机构] Department of Building Structures, Ogarev Mordovia State University, Russia^1

[学科分类] 土木及结构工程学

[关键词] Bending and compressive strength;Cement composite;Fine-grained concretes;Humidity conditions;Mechanical characteristics;Polycarboxylate superplasticizer;Self-compacting;Technological characteristics