Experimental studies of crack resistance of high-strength fine-aggregate "powdery" concrete

• Main Author: Okolnikova, Galina
• Format: Conference Proceeding
• Language: English
• Subjects: Additives; Bend strength; Compressive strength; Concrete; Construction materials; Crack propagation; Fracture mechanics; High strength concretes; Mechanical properties; Modulus of elasticity; Physical properties; Tensile strength
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0103509

Currently, the high-strength modified concrete with mineral additives with compressive strength of 80 MPa and above are developed, introduced and produced on an industrial scale. In this paper, the research was carried out for the high-strength fine-grained modified "powdery" concrete (HSFPC), which is a relatively new construction material. The purpose of the study is to determine the basic physical and mechanical properties and crack resistance characteristics of high-strength fine-grained concrete, to simulate their destruction under various loading conditions, to experimentally refine the hypothesis of the process of fracture of high-strength and ultra-high-strength concrete. According to the results of the study, the experimental values of the physicomechanical characteristics of fine-grained high-strength concrete (aged 7, 14, 28, 60 days) were determined: cubic strength, concrete tensile strength at bending, concrete tensile strength, axial cracking, concrete axial class compression, elastic modulus. The parameters of fracture mechanics: critical factor of stress intensity, critical rate of energy release are also determined. The results obtained are the basis for development of the theory of strength of high-performance concrete using the methods of fracture mechanics, and also for creating a regulatory framework for the design of engineering structures made of high-strength concrete.