铁尾矿砂对C50混凝土力学性能的影响  

Influence of iron tailings sand on mechanical properties of C50 concrete

作　　者：王玉雅[1] 韩守杰[1] 韩欣 庄园 张衡 WANG Yuya;HAN Shoujie;HAN Xin;ZHUANG Yuan;ZHANG Heng(School of Civil Engineering,Shangqiu Institute of Technology,Shangqiu 476000,China;China Design Group Co.Ltd.,Nanjing 210014,China)

机构地区：[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

出　　处：《新型建筑材料》2018年第8期108-110,共3页New Building Materials

基　　金：河南省高等学校重点科研项目(16A880036;18A410002;18B560008)

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。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,60d and 90 d strength of C50 concrete is very close to that of ref- erence 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 railings 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.

关 键 词：铁尾矿砂 混凝土 力学性能 拉压比 

分 类 号：TU528.041[建筑科学—建筑技术科学]