Determination of Optimal Fibre Reinforcement Parameters for Self-Compacting Concretes

Abstract

The article presents the results of the conducted study of the possibility and expediency of disperse reinforcement of self-compacting concrete (SCC) in order to improve the physical and technical indicators and the analysis of deformative properties of SCC using fiber. For satisfaction of requests from factories-manufacturers of SCC concerning the improvement of physical-mechanical and operational properties of SCC and identification of basic dependences that can be used by them in change of technological regulations for this type of concrete, theoretical and empirical methods of research were used. The results of these studies indicate that the introduction of a certain amount of polypropylene fiber improves the physical-technical and deformation characteristics of the operating SCC compounds, increasing the bending strength and reducing the size of shrinkage deformations. The efficiency of bulk fibre reinforcement with low-modulus polypropylene fibre of SCC mixtures has been experimentally proven in production. From the deduced mathematical dependences practical recommendations on an optimum choice of the sizes and the fibre content in SCC mixtures are proposed to obtain an optimum price-quality ratio, particularly when performing concrete works in summer time.