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程 猛,张经双,段雪雷,等. 冻融循环作用下混杂纤维粉煤灰混凝土力学性能试验[J]. 科学技术与工程, 2020, 20(27): 11288-11294.
chengmeng,duanxuelei,et al.Experimental Study on Mechanical Properties of Concrete Reinforced With Hybrid Fiber and Fly Ash Subjected to Freeze-thaw Cycles[J].Science Technology and Engineering,2020,20(27):11288-11294.
冻融循环作用下混杂纤维粉煤灰混凝土力学性能试验
Experimental Study on Mechanical Properties of Concrete Reinforced With Hybrid Fiber and Fly Ash Subjected to Freeze-thaw Cycles
投稿时间:2019-11-15  修订日期:2020-06-26
DOI:
中文关键词:  混凝土 冻融循环 混杂纤维 粉煤灰 抗压强度 相对动弹性模量
英文关键词:concrete  freeze-thaw cycles  hybrid fiber  fly ash  compressive strength  relative dynamic elastic modulus
基金项目:安徽省高校自然科学研究重点项目 (KJ2015A135)
           
作者单位
程 猛 安徽理工大学
张经双 安徽理工大学 土木建筑学院
安徽理工大学 矿山地下工程教育部工程研究中心
段雪雷 安徽理工大学
朱建华 安徽理工大学
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中文摘要:
      为了研究混杂纤维和粉煤灰增强混凝土在冻融循环作用下的损伤程度,通过对基准混凝土、混杂纤维混凝土和混杂纤维粉煤灰混凝土试样在冻融循环条件下进行抗压强度试验及超声波检测试验,得到冻融破坏后混凝土的抗压强度和相对动弹性模量,分析抗压强度损伤量、相对动弹性模量损伤量和内部结构破坏机制,建立了基于相对动弹性模量的强度衰减方程。试验结果表明:基准混凝土、混杂纤维混凝土和混杂纤维粉煤灰混凝土的抗压强度和相对动弹性模量均随着冻融循环次数的增加而减小;经历60次冻融循环时,其抗压强度和相对动弹性模量都有不同程度的下降;混杂纤维粉煤灰混凝土抗压强度和动弹性模量的损伤量在粉煤灰掺量小于10%时整体小于基准混凝土,而在粉煤灰掺量为20%和30%时大于基准混凝土;通过对冻融循环作用下混凝土相对抗压强度与相对动弹性模量的关系拟合,得到相关系数良好的相对抗压强度与相对动弹性模量的指数函数关系表达式;分析了混凝土冻融损伤、纤维和粉煤灰增强混凝土抗冻融机理。掺入适量纤维和粉煤灰能增强混凝土的抗冻融破坏能力。
英文摘要:
      In order to study the damage degree of both hybrid fiber and fly ash reinforced concrete under freeze-thaw cycle, the compressive strength test and ultrasonic testing test of normal concrete, hybrid fiber concrete as well as hybrid fiber fly ash concrete were carried out under freeze-thaw cycle conditions, the compressive strength and relative dynamic elastic modulus of concrete after freeze-thaw damage are obtained, the compressive strength damage, relative dynamic elastic modulus damage and internal structure failure mechanism are analyzed, and the strength attenuation equation based on relative dynamic elastic modulus is established. The test results show that the compressive strength and relative dynamic elastic modulus of normal concrete, hybrid fiber concrete and hybrid fiber fly ash concrete decrease with the increase of freeze-thaw cycles; after 60 freeze-thaw cycles, its compressive strength and relative dynamic elastic modulus decreased to varying degrees; the damage of compressive strength and dynamic elastic modulus of hybrid fiber fly ash concrete is smaller than that of reference concrete when the fly ash content is less than 10%, but larger than that of reference concrete when the fly ash content is 20% and 30%; by fitting the relationship between relative compressive strength and relative dynamic elastic modulus of concrete under freeze-thaw cycle, the exponential function expression of relative compressive strength and relative dynamic elastic modulus with good correlation coefficient is obtained; the freeze-thaw damage of concrete and the freeze-thaw resistance mechanism of fiber and fly ash reinforced concrete are analyzed. The research shows that fiber and proper amount of fly ash can enhance the freeze-thaw damage resistance of concrete.
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