The High Temperature Effect on Fibre Reinforced Self Compacting Lightweight Concrete Designed with Single and Hybrid Fibres

The purpose of this paper is to declare the results of investigation conducted on design of bre reinforced self compacting lightweight concrete which has three di erent concrete technologies, and high temperature e ect on it. For this aim, it is desired that production of new kind concrete material composed of bre reinforced concrete, self compacting concrete and structural lightweight concrete technologies using all their better bene ts. In this study, y ash was used as a powder to reduce Portland cement consumption as well as CO2 emission through the use of that waste material. A control self compacting concrete and 7 bre reinforced self compacting lightweight concretes were designed applying slump ow (T50owing time and owing diameter) and V-funnel tests to determine fresh concrete properties. In the design of bre reinforced self compacting lightweight concrete, both single and hybrid bre reinforced self compacting lightweight concrete mixes were produced using 1 macro and 1 micro steel bres in di erent lengths and aspect ratios. Hybrid bre reinforced self compacting lightweight concrete mixes were prepared using macro bres together with micro bre at three di erent percentages (50% 50%, 25% 75%, 75% 25%) by weight. After design process, cubic and prismatic concrete specimens were produced to determine hardened properties at standard concrete age. Firstly, exural tensile and compressive strength tests were performed on the concrete specimens on 28 day. Lastly, the concrete specimens were heated up to temperatures of 200, 400, 600 and 800 ◦C then compressive strength and exural tensile tests were performed to identify high temperature e ect comparing to strength test results obtained from standard laboratory conditions. The test results showed that concrete mixes including macro bres gave the best tensile strength properties, although they gave the worst fresh concrete properties.