煤矸石混凝土冻融损伤本构关系试验研究
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摘要
通过对冻融后煤矸石混凝土的单轴受压试验,研究了冻融循环次数和煤矸石取代率对煤矸石混凝土力学性能的影响,提出了冻融作用下煤矸石混凝土峰值应力、峰值应变的退化规律,并拟合应力-应变曲线,提出了煤矸石混凝土冻融损伤单轴受压本构关系。试验结果表明,随着冻融循环次数的增加,煤矸石混凝土峰值应力逐渐降低,峰值应变和极限应变逐渐增加,应力-应变曲线趋于扁平,受压早期压实效应尤为明显,弹性模量迅速降低,应力-应变曲线前端部分出现下凹。此本构关系精度较好,对煤矸石混凝土的推广应用和进一步改性研究有一定参考价值。
The effect of freezing-thawing cycle and replacement ratio of coal gangue on the mechanical properties of coal gangue concrete was studied,and it was put forwarded the degradation rule of peak stress and peak strain of coal gangue concrete under the freezing-thawing action,and stress-strain curve was fitted,and it was put forwarded the freezing-thawing damage uniaxial compression constitutive relationship of coal gangue concrete,by uniaxial compression test of coal gangue concrete experienced freezing-thawing. The test results show that with the increase of the freezing-thawing cycles number,the peak stress decreased gradually,the peak strain and ultimate strain increased gradually,the stress-strain curve tends to be flat,the compaction effect was obvious of the early compaction,the elastic modulus decreases rapidly,the concave was appeared in the front of stress-strain curve.This constitutive relation has a good accuracy,and has some consultative value of application and further study on modification of coal gangue concrete.
The effect of freezing-thawing cycle and replacement ratio of coal gangue on the mechanical properties of coal gangue concrete was studied,and it was put forwarded the degradation rule of peak stress and peak strain of coal gangue concrete under the freezing-thawing action,and stress-strain curve was fitted,and it was put forwarded the freezing-thawing damage uniaxial compression constitutive relationship of coal gangue concrete,by uniaxial compression test of coal gangue concrete experienced freezing-thawing. The test results show that with the increase of the freezing-thawing cycles number,the peak stress decreased gradually,the peak strain and ultimate strain increased gradually,the stress-strain curve tends to be flat,the compaction effect was obvious of the early compaction,the elastic modulus decreases rapidly,the concave was appeared in the front of stress-strain curve.This constitutive relation has a good accuracy,and has some consultative value of application and further study on modification of coal gangue concrete.
引文
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13 邹超英,赵娟,梁锋,等.冻融作用后混凝土力学性能的衰减规律.建筑结构学报,2008;29(1):117—123,138Zou Chaoying,Zhao Juan,Liang Feng,et al.Degradation of mechanical properties of concrete caused by freeze-thaw action.Journal of Building Structures,2008;29(1):117—123,138
14 过镇海.混凝土的强度和本构关系.北京:中国建筑工业出版社,1997:35—38Guo Zhenhai.Intensity and constitutive relation of the concrete.Beijing:Chinaarchitecture and Buildingpress,1997:35—38
15 曹大富,富立志,杨忠伟,等.冻融循环作用下混凝土受压本构特征研究.建筑材料学报,2013;16(1):17—23,32Cao Dafu,Fu Lizhi,Yang Zhongwei,et al.Study on constitutive relations of compressed concrete subjected to action of freezing-thawing cycles.Journal of Building Materials,2013;16(1):17—23,32
16王家滨,牛荻涛,袁斌,等.冻融损伤喷射混凝土本构关系及微观结构.土木建筑与环境工程,2016;38(1):30—39Wang Jiabin,Niu Ditao,Yuan Bin,et al.Constitutive relation and microstructure on shotcrete after freeze and thaw damage.Journal of Chongqing Jianzhu University,2016;38(1):30—39
2 宿辉,李琦,屈春来,等.高温养护条件下早龄期煤矸石混凝土单轴压缩声发射特性试验研究.科学技术与工程,2018;18(8):120—124Su Hui,Li Qi,Qu Chunlai,et al.Experimental study on acoustic emission characteristics of coal-gangue concrete in early age under high temperature curing conditions and uniaxial compression.Science Technology and Engineering,2018;18(8):120—124
3 郭彦霞,张圆圆,程芳琴,等.煤矸石综合利用的产业化及其展望.化工学报,2014;(7):2443—2453Guo Yanxia,Zhang Yuanyuan,Cheng Fangqin,et al.Industrial development and prospect about comprehensive utilization of coal gangue.CIESC Jorunal,2014;(7):2443—2453
4 张凯峰,吴雄,杨文,等.煤矸石建材资源化的研究进展.材料导报,2013;27(增刊1):290—293Zhang Kaifeng,Wu Xiong,Yang Wen,et al.Research progress of utilizing coal gangue as resource building materials.Materials Review,2013;27(S1):290—293
5 周梅,李高年,张倩,等.自燃煤矸石骨料在预拌混凝土中的应用研究.建筑材料学报,2015;18(5):830—835Zhou Mei,Li Gaonian,Zhang Qian,et al.Study on application of spontaneous combustion coal gangue aggregate in ready-mixed concrete.Journal of Building Materials,2015;18(5):830—835
6 周梅,田博宇,王强,等.自燃煤矸石粗集料对砂轻混凝土性能影响的试验研究.硅酸盐通报,2013;32(11):2231—2237Zhou Mei,Tian Boyu,Wang Qiang,et al.Experimental study on the influence of spontaneous combustion gangue coarse aggregate on sand lightweight concrete performance.Bulletin of the Chinese Ceramic Society,2013;32(11):2231—2237
7 刘鸽,任鹏飞,李珠,等.煤矸石保温混凝土抗压强度与弹性模量试验研究.科学技术与工程,2016;16(15):282—286Liu Ge,Ren Pengfei,Li Zhu,et al.Experimental study on compressive strength and elastic modulus of coal gangue thermal insulation concrete.Science Technology and Engineering,2016;16(15):282 —286
8 李永靖,韩俊俊,邢洋,等.煤矸石骨料混凝土的冻融循环试验研究.混凝土,2013;(12):100—102Li Yongjing,Han Junjun,Xing Yang,et al.Research on the freezing and thawing cycle test of coal gangue aggregate concrete.Concrete,2013;(12):100—102
9 郭金敏.煤矸石混凝土耐久性的试验研究.混凝土,2011;(7):56 —58Guo Jinmin.Experimental research on durabilities of coal gangue concrete.Concrete,2011;(7):56—58
10 宿晓萍,王清.复合盐浸-冻融-干湿多因素作用下的混凝土腐蚀破坏.吉林大学学报(工学版),2015;45(1):112—120Su Xiaoping,Wang Qing.Corrosion damage of concrete under multi-salt soaking,freezing-thawing and dry-wet cycles.Journal of Jilin University(Engineering and Technology Edition),2015;45(1):112—120
11 刘倩,金会心,朱明燕,等.煤矸石焙烧过程中的物相转化及铝硅活性研究.湿法冶金,2014;(3):222—225Liu Qian,Jin Huixin,Zhu Mingyan,et al.Phases transformation and activity of aluminum and silicon during roasting process of coal gangue.Hydrometallurgy of China,2014;(3):222—225
12 徐善华,王友德,李安邦,等.冻融损伤混凝土重复受压本构关系.哈尔滨工业大学学报,2015;(4):104—110Xu Shanhua,Wang Youde,Li Anbang,et al.Dynamic constitutive relation of concrete with freeze-thaw damage under repeated loading.Journal of Harbin Institute of Technology,2015;(4):104—110
13 邹超英,赵娟,梁锋,等.冻融作用后混凝土力学性能的衰减规律.建筑结构学报,2008;29(1):117—123,138Zou Chaoying,Zhao Juan,Liang Feng,et al.Degradation of mechanical properties of concrete caused by freeze-thaw action.Journal of Building Structures,2008;29(1):117—123,138
14 过镇海.混凝土的强度和本构关系.北京:中国建筑工业出版社,1997:35—38Guo Zhenhai.Intensity and constitutive relation of the concrete.Beijing:Chinaarchitecture and Buildingpress,1997:35—38
15 曹大富,富立志,杨忠伟,等.冻融循环作用下混凝土受压本构特征研究.建筑材料学报,2013;16(1):17—23,32Cao Dafu,Fu Lizhi,Yang Zhongwei,et al.Study on constitutive relations of compressed concrete subjected to action of freezing-thawing cycles.Journal of Building Materials,2013;16(1):17—23,32
16王家滨,牛荻涛,袁斌,等.冻融损伤喷射混凝土本构关系及微观结构.土木建筑与环境工程,2016;38(1):30—39Wang Jiabin,Niu Ditao,Yuan Bin,et al.Constitutive relation and microstructure on shotcrete after freeze and thaw damage.Journal of Chongqing Jianzhu University,2016;38(1):30—39