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

4th International Conference on Safety Problems of Civil Engineering Critical Infrastructures

土木建筑工程

Nizina, T.A.^1 ; Balykov, A.S.^1 ; Korovkin, D.I.^1 ; Volodin, V.V.^1

Department of Building Structures, Ogarev Mordovia State University, Russia^1

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

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/481/1/012048/pdf
DOI  :  10.1088/1757-899X/481/1/012048

学科分类：土木及结构工程学

来源: IOP

【 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.