预拌掺锂渣再生混凝土抗压——劈裂抗拉试验研究
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摘要
采用标准试验方法,研究锂渣掺量(0、10%、20%、30%)及再生粗骨料取代率(30%、50%、70%、100%)对预拌掺锂渣再生混凝土立方体抗压—劈裂抗拉强度的影响规律。结果表明,掺入适量锂渣,尤其在后期,锂渣能够与水泥水化产物发生二次水化反应,对再生混凝土的强度有一定提升,但掺入过多,则会产生反作用。再生粗骨料最佳取代率在50%左右。若取代率过大,由于再生骨料存在自身缺陷,会对强度产生较大负影响。通过试验数据及回归分析,拟合出预拌掺锂渣再生混凝土劈裂抗拉强度与立方体抗压强度之间的关系式。经对比发现,计算值与试验结果契合度较高。
The influence of lithium slag content(0,10%,20%,30%)and recycled coarse aggregate replacement rate(30%,50%,70%,100%)on the cube compressive strength and splitting tensile strength of recycled concrete with pre-mixed lithium slag was studied by standard test method.The results show that when lithium slag is added,especially in later stage,lithium slag can react with cement hydration products for two times,and the strength of recycled concrete will be improved.However,too much incorporation will produce counteraction.The optimum replacement rate of recycled coarse aggregate is about 50%.If the substitution rate is too large,the regenerated aggregate has its own defects,which will have a greater negative impact on the strength.Through experimental data and regression analysis,the relationship between splitting tensile strength and cube compressive strength of recycled concrete mixed with lithium slag is fitted,and it is found that the agreement between the calculated value and the test result is higher.
The influence of lithium slag content(0,10%,20%,30%)and recycled coarse aggregate replacement rate(30%,50%,70%,100%)on the cube compressive strength and splitting tensile strength of recycled concrete with pre-mixed lithium slag was studied by standard test method.The results show that when lithium slag is added,especially in later stage,lithium slag can react with cement hydration products for two times,and the strength of recycled concrete will be improved.However,too much incorporation will produce counteraction.The optimum replacement rate of recycled coarse aggregate is about 50%.If the substitution rate is too large,the regenerated aggregate has its own defects,which will have a greater negative impact on the strength.Through experimental data and regression analysis,the relationship between splitting tensile strength and cube compressive strength of recycled concrete mixed with lithium slag is fitted,and it is found that the agreement between the calculated value and the test result is higher.
引文
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[3]肖建庄,胡博,丁陶.再生混凝土早期抗开裂性能试验研究[J].同济大学学报(自然科学版),2015,43(10):1574.
[4]于江,严文龙,秦拥军,等.掺锂渣再生粗骨料混凝土抗压强度试验研究[J].混凝土与水泥制品,2015(8):94-98.
[5]严文龙,于江,秦拥军,等.掺锂渣再生混凝土劈裂抗拉强度试验研究[J].新疆大学学报(自然科学版),2015(3):362-367.
[6]侯勇辉,秦拥军,李振兴,等.掺锂渣再生粗骨料混凝土力学性能试验研究[J].新型建筑材料,2016,43(11):17-19,42.
[7]王利夫.建筑废料再生混凝土基本力学性能试验研究[D].杨凌:西北农林科技大学,2017.
[8]霍洪媛,范程程,陈爱玖,等.不同强度等级的再生骨料对再生混凝土基本力学性能影响[J].混凝土,2017(2):60-62,65.
[9]郭樟根,陈晨,范秉杰,等.再生粗细骨料混凝土基本力学性能试验研究[J].建筑结构学报,2016,37(S2):94-102.
[10]梁炯丰,谢挺挺,顾连胜,等.橡胶取代率对再生混凝土基本力学性能的影响[J].混凝土,2016(4):91-93.
[11]古松,苏燕,胡宏骏.再生混凝土基本力学性能及开发研究[J].混凝土,2015(4):90-94.
[12]何盛东,栗蕾,李广慧,等.机制砂混凝土劈裂抗拉强度的试验研究[J].混凝土,2014(11):50-52.
[13]再生混凝土应用技术规程:DG/TJ 08-2018-2007[S].
[14]再生混凝土技术规程:XJJ076-2017[S].乌鲁木齐:新疆维吾尔自治区住建厅,2017.
[15]XU B W,SHI H S.Correlations among mechanical properties of steel fiber reinforced concrete[J].Construction and Building Materials,2009,23(12):3468-3474.
[16]ZAIN M F M,MAHMUD H B,ILHAM A,et al.Predictionof splitting tensile strength of high-performance concrete[J].Cement and Concrete Research,2002,32(8):1251-1258.