不同粒径砂粒水泥砂浆冻融破坏实验研究
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摘要
为研究颗粒粒径差异对水泥砂浆冻融破坏的影响,对不同粒径砂粒水泥砂浆试件进行冻融循环实验,测试不同冻融循环周期后水泥砂浆立方体抗压强度,并利用扫描电子显微镜(SEM)对不同粒径砂粒试件破坏面进行观察,分析冻融循环条件对不同粒径砂粒试件破坏形态及其物理力学性质变化规律的影响。结果表明:随冻融周期增加,粒径30目试件表面以颗粒脱落为主,粒径40目试件表面以片状剥落为主。纵波波速以及单次冻融前后质量差值均随冻融周期增加而降低。在冻融循环前期,水化反应对试件力学性能影响占主导地位,造成试件抗压强度、弹性模量增加,冻融循环后期,冻融损伤加剧,微裂纹、微孔洞扩展造成抗压强度、弹性模量降低。相同冻融周期后,纵波波速、抗压强度和弹性模量随粒径减小而降低。提出改进的微观颗粒胶结物理模型,解释了不同粒径水泥砂浆冻融破坏机制。
In order to study the effect of grain size difference on the freeze-thaw damage of cement mortar,freezing-thawing cycle experiment was carried out for cement mortar specimens with different sand grain sizes,and the compressive strength of cement mortar cube was measured after different freezing-thawing cycles.The failure surface of samples with different grain sizes was observed by scanning electron microscope(SEM),and the influence of freezing-thawing cycle conditions on the failure patterns and physical and mechanical properties of cement mortar with different grain sizes was analyzed.Results indicate that with the increase of freezing-thawing cycles,when sand grain size30 mesh,grains on specimen surface fall off mainly.When sand grain size 40 mesh,grains mainly flake off from specimen surface.The difference of quality before and after single freezing-thawing and P wave velocity decreases with the increase of freezing and thawing cycles.In the early stage of freezethaw cycle,the hydration reaction has a dominant effect on the mechanical properties of the specimen,resulting in the increase of compressive strength and elastic modulus.In the later stage of freeze-thaw cycle,the effect of freeze-thaw damage is enhanced,and micro-cracks and micro-hole expanded causing the decrease of compressive strength and elastic modulus.The compressive strength and elastic modulus decreased with the decrease of particle size after the same freezing and thawing cycle.The improved micro-particle cementing model is proposed to explain the freeze-thaw damage characteristics of cement mortar with different particle size.
In order to study the effect of grain size difference on the freeze-thaw damage of cement mortar,freezing-thawing cycle experiment was carried out for cement mortar specimens with different sand grain sizes,and the compressive strength of cement mortar cube was measured after different freezing-thawing cycles.The failure surface of samples with different grain sizes was observed by scanning electron microscope(SEM),and the influence of freezing-thawing cycle conditions on the failure patterns and physical and mechanical properties of cement mortar with different grain sizes was analyzed.Results indicate that with the increase of freezing-thawing cycles,when sand grain size30 mesh,grains on specimen surface fall off mainly.When sand grain size 40 mesh,grains mainly flake off from specimen surface.The difference of quality before and after single freezing-thawing and P wave velocity decreases with the increase of freezing and thawing cycles.In the early stage of freezethaw cycle,the hydration reaction has a dominant effect on the mechanical properties of the specimen,resulting in the increase of compressive strength and elastic modulus.In the later stage of freeze-thaw cycle,the effect of freeze-thaw damage is enhanced,and micro-cracks and micro-hole expanded causing the decrease of compressive strength and elastic modulus.The compressive strength and elastic modulus decreased with the decrease of particle size after the same freezing and thawing cycle.The improved micro-particle cementing model is proposed to explain the freeze-thaw damage characteristics of cement mortar with different particle size.
引文
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[13] Powers T C.Void spacing as a basis for producing air-entrained concrete[J].ACI Journal,1954,50(9):741-760.
[14]贾海梁,刘清秉,项伟,等.冻融循环作用下饱和砂岩损伤扩展模型研究[J].岩石力学与工程学报,2013,32(S2):3049-3055(JIA Hailiang,LIU Qingbing,XIANG Wei,et al.Damage evolution model of saturated sandstone under freeze-thaw cycles[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(S2):3049-3055(in Chinese))
[15]蒋明镜,周雅萍,陈贺.不同胶结厚度下粒间胶结力学特性的试验研究[J].岩土力学,2013,34(5):1264-1273(JIANG Mingjing,ZHOU Yaping,CHEN He.Experimental study of mechanical behaviors of bonded granules under different bond thicknesses[J].Rock and Soil Mechanics,2013,34(5):1264-1273(in Chinese))
[2]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):299-304(TIAN Wei,XING Kai,XIE Yongli.Experimental study of damage degradation mechanism of concrete in freezethaw environment[J].Journal of Experimental Mechanics,2015,30(3):299-304(in Chinese))
[3]李建新,王起才,李盛,等.含气量对水泥砂浆抗冻耐久性的影响[J].硅酸盐通报,2014,33(7):1781-1787(LI Jianxin,WANG Qicai,LI Sheng,et al.Effect of air content on the frost resistance of the cement mortar[J].Bulletin of the Chinese Ceramic Society,2014,33(7):1781-1787(in Chinese))
[4]李盛,王起才,马莉,等.水泥砂浆冻胀破坏力学模型计算分析[J].硅酸盐通报,2014,33(5):1123-1129(LI Sheng,WANG Qicai,MA Li,et al.Computational analysis of mechanical model for cement mortar frost heaving damage[J].Bulletin of the Chinese Ceramic Society,2014,33(5):1123-1129(in Chinese))
[5]李传明,刘万荣.节理岩体巷道围岩稳定性的颗粒离散元分析[J].中国安全科学学报,2017,27(4):133-138(LI Chuanming,LIU Wanrong.Particle discrete element method based analysis of stability of roadway surrounding joint rock mass[J].China Safety Science Journal,2017,27(4):133-138(in Chinese))
[6]戴北冰,杨峻,周翠英.颗粒大小对颗粒材料力学行为影响初探[J].岩土力学,2014,35(7):1878-1884(DAI Beibing,YANG Jun,ZHOU Cuiying.A preliminary investigation on effect of particle size on mechanical behavior of granular materials[J].Rock and Soil Mechanics,2014,35(7):1878-1884(in Chinese))
[7] Sitharam T G,Nimbkar M S.Micromechanical modeling of granular materials:effect of particle size and gradation[J].Geotechnical and Geological Engineering,2000,18(2):91-112.
[8]王来贵,习彦会,刘向峰,等.不同粒径砂粒水泥胶结体物理力学性质研究[J].硅酸盐通报,2016,35(1):61-67(WANG Laigui,XI Yanhui,LIU Xiangfeng,et al.Physical and mechanical properties of cemented body of sand grains with different diameter[J].Bulletin of the Chinese Ceramic Society,2016,35(1):61-67(in Chinese))
[9]蒋明镜,白闰平,刘静德,等.岩石微观颗粒接触特性的试验研究[J].岩石力学与工程学报,2013,32(6):1121-1128(JIANG Mingjing,BAI Runping,LIU Jingde,et al.Experimental study of inter-granular particles bonding behaviors for rock microstructure[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(6):1121-1128(in Chinese))
[10]蒋明镜,肖俞,孙渝刚,等.水泥胶结颗粒的微观力学模型试验[J].岩土力学,2012,33(5):1293-1299(JIANG Mingjing,XIAO Yu,SUN Yugang,et al.Experimental investigation on micromechanical model of cement-bonded particles[J].Rock and Soil Mechanics,2012,33(5):1293-1299(in Chinese))
[11]张继周,缪林昌,杨振峰.冻融条件下岩石损伤劣化机制和力学特性研究[J].岩石力学与工程学报,2008,27(8):1688-1694(ZHANG Jizhou,MIAO Linchang,YANG Zhenfeng.Research on rock degradation and deterioration mechanisms and mechanical characteristics under cyclic freezing-thawing[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(8):1688-1694(in Chinese))
[12] Powers T C,Helmuth R A.Theory of volume changes in hardened portland cement paste during freezing[J].Proceedings Highway Research Board,1953,32:285-297.
[13] Powers T C.Void spacing as a basis for producing air-entrained concrete[J].ACI Journal,1954,50(9):741-760.
[14]贾海梁,刘清秉,项伟,等.冻融循环作用下饱和砂岩损伤扩展模型研究[J].岩石力学与工程学报,2013,32(S2):3049-3055(JIA Hailiang,LIU Qingbing,XIANG Wei,et al.Damage evolution model of saturated sandstone under freeze-thaw cycles[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(S2):3049-3055(in Chinese))
[15]蒋明镜,周雅萍,陈贺.不同胶结厚度下粒间胶结力学特性的试验研究[J].岩土力学,2013,34(5):1264-1273(JIANG Mingjing,ZHOU Yaping,CHEN He.Experimental study of mechanical behaviors of bonded granules under different bond thicknesses[J].Rock and Soil Mechanics,2013,34(5):1264-1273(in Chinese))
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