USING NATURAL RUBBER LATEX TO IMPROVE THE STRENGTHS OF CEMENT STABILIZED RECYCLED CONCRETE AGGREGATE SỬ DỤNG MỦ CAO SU TỰ NHIÊN CẢI THIỆN CƯỜNG ĐỘ XI MĂNG GIA CỐ CỐT LIỆU BÊ TÔNG TÁI CHẾ

Abstract

This research focuses on the utilization of natural rubber latex (NRL) to improve the strengths of cement stabilized recycled concrete aggregate (RCA). The cement content of 3%, 5% and 7% were added with RCA based on the mass of RCA. Natural rubber latex is a natural polymer, was added to the mixture following 0%, 5%, 10% and 15% mass of cement. The unconfined compressive strength (UCS) and indirect tensile strength (ITS) of the samples were determined after 7 days and 28 days. The experimental results showed that the unconfined compressive strength and indirect tensile strength of the samples depend on the cement content, the ratio of NRL/X and the curing time. The sample achieved the highest UCS and ITS value at the optimum NRL/X ratio; the optimum NRL/X ratio of 3% cement was 10%, and for 5% and 7% cement contents were 5% NRL/X. When the NRL/X ratio exceeds the optimum value, the strength of the sample decreases, but all samples still meet the compressive strength requirements for pavement base layer.