ẢNH HƯỞNG CỦA HÀM LƯỢNG XỈ ĐÁY LÒ ĐỐT RÁC THAY THẾ CÁT LÊN MỘT SỐ TÍNH CHẤT CƠ LÝ CỦA VỮA XÂY DỰNG

Abstract

This study is to investigate the use of waste incineration bottom ash to replace natural sand in the production of mortar. Mortar mixtures were designed with a flow diameter of 175÷205 mm, using cement, fly ash, and silica fume as binder materials, and using waste incineration bottom ash to replace 0%, 25%, 50%, 75%, and 100% natural sand by weight. Test results indicated that unit weight, compressive strength, flexural strength, and ultrasonic pulse velocity of mortars decreased, while water absorption increased with increasing waste incineration bottom ash content. All mortars using waste incineration bottom ash had satisfactory quality with compressive strength higher than 30 MPa and ultrasonic pulse velocity higher than 3000 m/s. This study proved that with the presence of silica fume in the mortar mix proportion, waste incineration bottom ash can be used to replace natural sand up to 100% in producing mortar.