钢渣粉部分替代煅烧MgO对MPC混凝土性能的影响
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摘要
将钢渣粉取代部分煅烧MgO,研究了不同掺量钢渣粉对磷酸镁水泥(MPC)混凝土力学性能和耐久性能的影响。试验结果表明,掺有5%～30%取代率的钢渣粉会降低MPC混凝土的早期强度,但会明显提高MPC混凝土的后期强度,当钢渣粉取代率为15%时,MPC混凝土的60 d抗压强度达到最大;较低和较高的钢渣粉取代率会对MPC混凝土的劈裂抗拉强度产生不利影响,当钢渣粉取代率为15%和20%时,MPC混凝土的抗拉强度高于基准组;不同钢渣粉取代率的MPC混凝土的耐水性能均高于基准组,当钢渣粉取代率超过10%后,MPC混凝土的强度保持率均在0.9以上;钢渣粉的掺入可在一定程度上提高MPC混凝土抗氯盐及硫酸盐侵蚀性能,但较高的钢渣粉取代率会对MPC混凝土抗硫酸盐侵蚀能力产生不利影响。
The effect of steel slag powder on mechanical properties and durability of magnesium phosphate cement(MPC) concrete was investigated by partially substituting calcined MgO with steel slag powder. The results indicate that when adding steel slag powder with 5% ～30% substitution ratios, the early strength of MPC concrete can be reduced,whereas the later strength of MPC concrete can be evidently enhanced. Specifically, the substitution ratio of steel slag powder is 15%, the 60 d compressive strength of MPC concrete reaches the maximum value. Lower and higher substitution ratio of steel slag powder will adversely affect the splitting tensile strength of MPC concrete, when the substitution ratios are15% and 20%, the tensile strengths of MPC concrete are higher than those of reference group. The water resistance of MPC concrete with different substitution ratios of steel slag powder is higher than that of reference group. When the substitution ratio exceeds 10%, the strength retention rate of MPC concrete is above 0.9. The addition of steel slag powder can improve the corrosion resistance of MPC concrete to chloride and sulfate to some extent. However, the higher substitution rate of steel slag powder will have a negative influence on the sulfate corrosion resistance of MPC concrete.
The effect of steel slag powder on mechanical properties and durability of magnesium phosphate cement(MPC) concrete was investigated by partially substituting calcined MgO with steel slag powder. The results indicate that when adding steel slag powder with 5% ～30% substitution ratios, the early strength of MPC concrete can be reduced,whereas the later strength of MPC concrete can be evidently enhanced. Specifically, the substitution ratio of steel slag powder is 15%, the 60 d compressive strength of MPC concrete reaches the maximum value. Lower and higher substitution ratio of steel slag powder will adversely affect the splitting tensile strength of MPC concrete, when the substitution ratios are15% and 20%, the tensile strengths of MPC concrete are higher than those of reference group. The water resistance of MPC concrete with different substitution ratios of steel slag powder is higher than that of reference group. When the substitution ratio exceeds 10%, the strength retention rate of MPC concrete is above 0.9. The addition of steel slag powder can improve the corrosion resistance of MPC concrete to chloride and sulfate to some extent. However, the higher substitution rate of steel slag powder will have a negative influence on the sulfate corrosion resistance of MPC concrete.
引文
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[19]陈镇杉,吴玉生,彭鹏飞,等.加气混凝土废渣对磷酸镁水泥性能的影响[J].新型建筑材料,2018,45(4):74-76,107.
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[23]俞家欢,熊攀辉,汲野,等.聚丙烯纤维掺量对磷酸镁水泥混凝土性能影响[J].沈阳建筑大学学报:自然科学版,2017,33(2):266-274.
[24]Guo J L,Bao Y P,Wang M.Steel slag in China:treatment,recycling,and management[J].Waste Management,2018,78:318-330.
[2]王庆珍,钱觉时,秦继辉,等.环境温度对磷酸镁水泥凝结时间和强度发展的影响[J].硅酸盐学报,2013,41(11):1493-1498.
[3]常远,史才军,杨楠,等.磷酸镁水泥基材料耐久性研究进展[J].硅酸盐学报,2014,42(4):486-493.
[4]陈妤,李十泉,陈蓓,等.磷酸镁水泥净浆及CFRP切丝改性试验研究[J].混凝土与水泥制品,2015(9):55-59.
[5]姜自超,汪宏涛,戴丰乐,等.磷酸镁水泥耐酸碱性能及机理研究[J].功能材料,2016,47(11):156-161.
[6]徐立.磷酸镁水泥钢渣透水混凝土试验研究[J].混凝土与水泥制品,2018(8):6-9.
[7]周启兆,焦宝祥,丁胜,等.磷酸盐水泥基普通混凝土路面修补剂的研究[J].新型建筑材料,2011,38(2):25-28.
[8]俞家欢,闫林伟.磷酸镁混凝土路面快速修补材料的耐水性试验[J].沈阳建筑大学学报:自然科学版,2018,34(5):855-863.
[9]孙佳龙,黄煜镔,范英儒,等.磷酸镁水泥用作道路的快速修补材料研究[J].功能材料,2018,49(1):1040-1043.
[10]孙春景,林旭健,季韬.磷镁比、水灰比、硼砂掺量对磷酸钾镁水泥耐水性的影响[J].福州大学学报:自然科学版,2016,44(6):856-862.
[11]齐浩霖,关岩,毕万利,等.硼砂对磷酸镁水泥抗压强度的影响研究[J].硅酸盐通报,2016,35(12):4252-4255,4260.
[12]李倩,赖振宇,卢忠远.复合磷酸盐磷酸镁水泥的性能研究[J].混凝土与水泥制品,2012(11):22-25.
[13]Orlov A A,Chernykh T N.Research of Water Resistance and Heat Resistance of Magnesium Phosphate Cements[J].Procedia Engineering,2016,150:1623-1626.
[14]Chong L L,Yang J M,Shi C J.Effect of curing regime on water resistance of magnesium-potassium phosphate cement[J].Construction&Building Materials,2017,151:43-51.
[15]路毅.低温下粉煤灰改性磷酸镁水泥性能研究[J].硅酸盐通报,2015,34(12):3596-3600.
[16]赵思勰,晏华,汪宏涛,等.粉煤灰掺量对磷酸钾镁水泥水化动力学的影响[J].材料研究学报,2017,31(11):839-846.
[17]吴凯,叶钰燕,施惠生,等.钢渣对磷酸盐水泥基材料性能的影响机制[J].同济大学学报:自然科学版,2018,46(1):87-93.
[18]赵江涛,李相国,张琰,等.粉煤灰对磷酸镁水泥的影响[J]硅酸盐通报,2018,37(2):695-700.
[19]陈镇杉,吴玉生,彭鹏飞,等.加气混凝土废渣对磷酸镁水泥性能的影响[J].新型建筑材料,2018,45(4):74-76,107.
[20]石亚文,陈兵.偏高岭土改性磷酸镁水泥[J].硅酸盐学报2018,46(8):1111-1116.
[21]李九苏,王宇文,张文勃.磷酸镁水泥混凝土耐久性试验研究[J].硅酸盐通报,2014,33(10):2666-2671.
[22]刘新状,唐丽君.磷酸镁混凝土试验研究[J].施工技术2015,44(S2):497-498.
[23]俞家欢,熊攀辉,汲野,等.聚丙烯纤维掺量对磷酸镁水泥混凝土性能影响[J].沈阳建筑大学学报:自然科学版,2017,33(2):266-274.
[24]Guo J L,Bao Y P,Wang M.Steel slag in China:treatment,recycling,and management[J].Waste Management,2018,78:318-330.