铁尾矿砂对C50混凝土力学性能的影响

（1.商丘工学院 土木工程学院，河南 商丘  476000；2.中设设计集团股份有限公司，江苏 南京  210014）

    摘要：将铁尾矿作为细集料取代天然砂，研究了铁尾矿砂取代率对C50混凝土力学性能的影响。结果表明：随铁尾矿砂取代率的增加，C50混凝土不同龄期的抗压强度、劈裂抗拉强度和弹性模量均逐渐降低；当铁尾矿砂取代率为20%时，C50混凝土的28、60、90 d强度与未掺铁尾矿砂的基准组相比降幅均较小；基准组C50混凝土的拉压比随龄期延长而缓慢增大，而不同铁尾矿砂取代率的C50混凝土拉压比随龄期延长大致呈先减小后增大趋势，28 d后其拉压比与基准组相近。

    关键词：铁尾矿砂；混凝土；力学性能；拉压比

    中图分类号：TU528.041        文献标识码：A        文章编号：1001-702X（2018）08-0108-03

 

Influence of iron tailings sand on mechanical properties of C50 concrete

WANG Yuya1，HAN Shoujie1，HAN Xin1，ZHUANG Yuan2，ZHANG Heng2

（1.School of Civil Engineering，Shangqiu Institute of Technology，Shangqiu 476000，China；

2.China Design Group Co. Ltd.，Nanjing 210014，China）

    Abstract：The influence of different substitution ratios of iron tailings sand as fine aggregate by substituting natural sand on mechanical properties of C50 concrete were studied in this paper. The results show that：the compressive strength，splitting tensile strength and elastic modulus of C50 concrete in various curing times gradually reduces with the increase of the iron tailings sand substitution ratio；when the substitution ratio is 20%，the 28 d，60 d and 90 d strength of C50 concrete is very close to that of reference group；the tension-compression ratio of reference group increases slowly with curing time，but the tension-compression ratio of the C50 concrete with different iron tailings sand contents decreases first and then increases with curing time. After the curing time of 28 days，the tension-compression ratio of C50 concrete mixed with different substitution ratios of iron tailings sand is close to that of reference group.

    Key words：iron tailings sand，concrete，mechanical property，tension-compression ratio