钢纤维对铁尾矿砂再生混凝土力学性能影响

Effect of Steel Fiber on the Mechanical Properties of Iron Tailings Recycled Concrete

通过6组共54个铁尾矿砂再生混凝土试块试验,研究了水灰比对不同取代率再生混凝土力学性能的影响,试验结果表明:水灰比为0.3的铁尾矿砂再生混凝土(再生粗骨料取代率50%)的综合力学性能较好;铁尾矿砂和钢纤维的共同作用下,抗压强度提升16.4%,劈裂抗拉强度提高69.5%;级配良好的铁尾矿砂(中砂)可以在强度等级C45的混凝土中完全替代天然砂。

Through 6 groups of 54 iron tailings recycled concrete test blocks,the effect of water-cement ratio on the mechanical properties of recycled concrete with different replacement rates was studied.The experimental results showed that iron tailings recycled concrete with a water-cement ratio of 0.3(recycled coarse aggregate)Replacement rate of 50%)has better comprehensive mechanical properties;under the combined action of iron tailings sand and steel fiber,the compressive strength is increased by 16.4%,and the splitting tensile strength is increased by 69.5%;the well-graded iron tailings(medium sand)It can completely replace natural sand in concrete with strength grade C45.