The compressive strength of the basalt fibre SCC was diminished by 28% at 500°C. The splitting tensile strength of the SCC was increased by adding 0.25% of fibre. Considerable degradation in the flexural strength of fibrous SCC was seen at 300°C. Slant shear of hybrid concrete was highly affected by fibre content of overlay. Interfacial surface roughened by sand blast provided proper bond in hybrid sample.

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Basalt fibers are new generation of natural concrete additives to arrest its micro-cracking and consequently improve concrete strength. The properties of self-compacted concrete (SCC) made with basalt fibers have not been studied extensively. In present work, the properties of fresh and hardened SCCs have been investigated with considering fibers content. Permeability of SCC for water and chlorite has been covered as well. It is demonstrated that fiber content less than 0.25% has no remarkable effect on flowability performance of fresh SCC. Concerning hardened SCC, the degradation of its mechanical properties has been noticed as 22% with increasing fibers content to 1.0%. The sorptivity of basalt fiber SCC is obviously dropped due to the nature of used fibers and their absorption.

This study presents an experimental investigation on the effect of artificial aggregate utilization fracture and permeability properties of concretes. For this, two types of artificial aggregates, namely, artificial fly ash aggregate (AFA) from cold bonding agglomeration process of fly ash and Portland cement and artificial slag aggregate (ASA) from cold bonding agglomeration process of ground granulated blast furnace slag and Portland cement, were replaced with natural aggregate as coarse aggregate. Moreover, to investigate the influence of water-to-cement ratio, three different water-to-cement ratios of 0.35, 0.45, and 0.55 were considered in the concrete production. The concretes were tested for the mechanical property in terms of as compressive strength, modulus of elasticity, and splitting, net flexural strength, and fracture energy and also permeability property such as water sorptivity, water penetration, gas permeability, and resistance to chloride ion penetration. The test results were also analyzed by means of statistical technique, namely, GLM-ANOVA. It was found that the use of cold bonded fly ash and slag aggregates were very effective on the performance characteristics of concretes depending on w/c ratio.