冻融循环下掺锂渣再生混凝土损伤试验
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摘要
针对冻融损伤分析再生粗骨料取代率和锂渣掺量对混凝土质量、动弹性模量以及抗压强度的影响。试验结果表明:过多使用再生粗骨料不利于抗冻性的提高;适量添加锂渣可以有助减轻冻融循环给混凝土带来质量损失的影响,且随着掺入量的增加,抗冻性能呈现先提高后降低的趋势,当掺量为20%时,抗冻性能达到最优。由试验数据拟合得到用再生粗骨料取代率以及锂渣掺量两因素的混凝土冻融后抗压强度劣化方程。
In order to obtain the effects of recycled coarse aggregate replacement rate and lithium slag content on concrete quality,dynamic elastic modulus and compressive strength,the single factor of freeze-thaw damage was used to analyze that. The test results show that excessive use of recycled coarse aggregate is not conducive to the improvement of frost resistance,the proper addition of lithium slag can help to reduce the mass loss caused by the freeze-thaw cycle,and with the increase of the amount of anti-freeze,the frost resistance will increase first and then decrease. The antifreeze performance is optimized when the amount of lithium slag is 20%. At the same time,according to the test results,the regression equation of compressive strength after concrete freeze-thaw is achieved by fitting the replacement ratio of recycled aggregate and the amount of lithium slag.
In order to obtain the effects of recycled coarse aggregate replacement rate and lithium slag content on concrete quality,dynamic elastic modulus and compressive strength,the single factor of freeze-thaw damage was used to analyze that. The test results show that excessive use of recycled coarse aggregate is not conducive to the improvement of frost resistance,the proper addition of lithium slag can help to reduce the mass loss caused by the freeze-thaw cycle,and with the increase of the amount of anti-freeze,the frost resistance will increase first and then decrease. The antifreeze performance is optimized when the amount of lithium slag is 20%. At the same time,according to the test results,the regression equation of compressive strength after concrete freeze-thaw is achieved by fitting the replacement ratio of recycled aggregate and the amount of lithium slag.
引文
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12陈升平,王佳雯.冻融环境下纤维混凝土损伤模型研究[J].混凝土,2017(10):58-61,67Chen Shengping,Wang Jiawen.Damage model of fiber reinforced concrete under freezing and thawing environment[J].Concrete,2017(10):58-61,67
13龙广成,刘赫,马昆林,等.考虑冻融作用的混凝土单轴压缩损伤本构模型[J].中南大学学报(自然科学版),2018,49(8):1884-1892Long Guangcheng,Liu He,Ma Kunlin,et al.Uniaxial compression damage constitutive model of concrete subjected to freezing and thawing[J].Journal of Central South University(Science and Technology),2018,49(8):1884-1892
14田威,邢凯,谢永利.冻融环境下混凝土损伤劣化机制的力学试验研究[J].实验力学,2015,30(3):299-304Tian Wei,Xing Kai,Xie Yongli.Experimental study of damage degradation mechanism of concrete in freeze-thaw environment[J].Journal of Experimental Mechanics,2015,30(3):299-304
2张善德,侍克斌,裴成元,等.高性能锂渣混凝土的试验研究[J].粉煤灰综合利用,2011(3):3-5,24Zhang Shande,Shi Kebin,Pei Chengyuan,et al.Experimental study on high-performance lithium slag concrete[J].Fly Ash Comprehensive Utilization,2011(3):3-5,24
3秦拥军,严文龙,于江.掺锂渣再生混凝土弹性模量及应力-应变曲线试验[J].科学技术与工程,2016,16(16):254-262Qin Yongjun,Yan Wenlong,Yu Jiang.Experimental on elastic modulus and stress-strain curve of recycled concrete incorporated lithium slag[J].Science Technology and Engineering,2016,16(16):254-262
4秦拥军,田盼盼,于江,等.再生混凝土细观层次的数字图像模型分析[J].河南科技大学学报(自然科学版),2017,38(2):54-58,6Qin Yongjun,Tian Panpan,Yu Jiang.Digital image model analysis of recycled concrete in meso-level[J].Journal of Henan University of Science and Technology(Natural Science),2017,38(2):54-58,6
5李振兴,秦拥军,严文龙.掺锂渣再生粗骨料混凝土梁受弯承载力试验研究[J].建筑科学,2017,33(1):29-35Li Zhenxing,Qin Yongjun,Yan Wenlong.Experimental research on the flexural property of doping lithium slag recycled coarse aggregate concrete beams[J].Building Science,2017,33(1):29-35
6陈爱玖,王静,章青.再生粗骨料混凝土抗冻耐久性试验研究[J].新型建筑材料,2008,35(12):1-5Chen Aijiu,Wang Jing,Zhang Qing.Experimental study on frost durability of reclaimed coarse aggregate concrete[J].New Building Materials,2008,35(12):1-5
7邢凯.冻融循环下混凝土力学性能试验及损伤演化研究[D].西安:长安大学,2015Xing Kai.Experimental study on mechanical properties and damage evolution of concrete under freezing-thawing cycles[D].Xi'an:Chang'an University,2015
8肖前慧,牛荻涛,朱文凭.冻融环境下混凝土强度衰减模型与耐久性寿命预测[J].建筑结构,2011,41(增刊2):203-207Xiao Qianhui,Niu Ditao,Zhu Wenping.Strength degradation model and durability service life prediction of concrete in freezing-thawing circumstance[J].Building Structure,2011,41(S2):203-207
9刘博文,彭刚,王孝政,等.不同冻融循环次数混凝土单轴压缩试验[J].水利水运工程学报,2017(1):32-36Liu Bowen,Peng Gang,Wang Xiaozheng,et al.Experimental studies on dynamic properties of concrete under different freeze-thaw cycles[J].Hydro-Science and Engineering,2017(1):32-36
10陈爱玖,章青,王静,等.再生混凝土冻融循环试验与损伤模型研究[J].工程力学,2009,26(11):102-107Chen Aijiu,Zhang Qing,Wang Jing,et al.Freeze-thaw cycle test and a damage mechanics model for recycled concrete[J].Engineering Mechanics,2009,26(11):102-107
11孙丛涛,牛荻涛,元成方,等.混凝土动弹性模量与超声声速及抗压强度的关系研究[J].混凝土,2010(4):14-16Sun Congtao,Niu Ditao,Yuan Chengfang,et al.Study on relation between dynamic modulus of elasticity and velocity of ultrasonic sound and compres[J].Concrete,2010(4):14-16
12陈升平,王佳雯.冻融环境下纤维混凝土损伤模型研究[J].混凝土,2017(10):58-61,67Chen Shengping,Wang Jiawen.Damage model of fiber reinforced concrete under freezing and thawing environment[J].Concrete,2017(10):58-61,67
13龙广成,刘赫,马昆林,等.考虑冻融作用的混凝土单轴压缩损伤本构模型[J].中南大学学报(自然科学版),2018,49(8):1884-1892Long Guangcheng,Liu He,Ma Kunlin,et al.Uniaxial compression damage constitutive model of concrete subjected to freezing and thawing[J].Journal of Central South University(Science and Technology),2018,49(8):1884-1892
14田威,邢凯,谢永利.冻融环境下混凝土损伤劣化机制的力学试验研究[J].实验力学,2015,30(3):299-304Tian Wei,Xing Kai,Xie Yongli.Experimental study of damage degradation mechanism of concrete in freeze-thaw environment[J].Journal of Experimental Mechanics,2015,30(3):299-304