Influence of Tefla Content as Partial Replacement of Fine Aggregate on Performance of Concrete

Abstract

Concrete is the most widely used material, Natural aggregate consists of up to 80% of the volume of concrete. Given the increasing depletion of natural aggregate, Fine aggregate is a prime material used for preparation of concrete and which plays a major role in mix design. Tefla is considered alternative material satisfy properties of fine aggregate and available easily, domestically with a great amount in OmAlrozam, a town near the city of Derna, Libya. The tefla were ground to roughly fine aggregate fineness, sieve analysis in ASTM C33 requirement of fine aggregate and tefla. physical tests were conducted and chemical composition of the tefla material was determined using X-Ray Fluorescence (XRF). This study aimed to investigate the suitability of tefla, I think is missing partial fine aggregate replacement on performance of concrete, the yellow tefla utilized in its dry condition (without pre-wetting). Four replacement levels, 2.5%, 5%, 7.5%, and 10%, were compared with the control specimen of w/c ratio 0.50. The mechanical and physical properties tests were performed after 7 and 28 days of curing in water. Results showed that concrete containing tefla as partial replacement of fine aggregate compare favourably well with the control specimen. Consequently, it is suggested that tefla can be used as replacement of fine aggregate in the production of concrete.