冻融循环后自密实混凝土单轴受压应力-应变曲线试验研究

发布时间：2018-09-07 20:37

【摘要】：为研究新疆地区自密实混凝土冻融循环后单轴受压应力-应变曲线,采用新疆地区原材料配制自密实混凝土,制作27个100 mm×100 mm×400 mm棱柱体抗压试件,经历0、25、50、75、100、125、150、175、200次冻融循环后,进行单轴受压应力-应变曲线试验。分析了不同冻融循环次数对自密实混凝土峰值应力、峰值应变、泊松比、和单轴受压应力-应变曲线的影响。结果表明:峰值应力随着冻融循环次数的增加而降低;在25、50次冻融循环时,峰值应变逐渐减小,50~200次冻融循环时,峰值应变随着冻融循环次数的增加逐渐增大;泊松比随着冻融循环次数的增加而减小;纵向应力-应变曲线随着冻融循环次数的增加渐趋扁平,与横轴的包围面积减小,自密实混凝土吸收能量的能力变弱。
[Abstract]:In order to study the stress-strain curve of self-compacting concrete under uniaxial compression after freeze-thaw cycle in Xinjiang area, the self-compacted concrete was prepared from raw materials in Xinjiang area. 27 specimens of self-compacted concrete were made by using 100 mm 脳 100 mm 脳 400 mm prism. The results showed that the concrete was subjected to the freezing and thawing cycles of 025255075100125150175200 times. The stress-strain curves under uniaxial compression were tested. The effects of different freeze-thaw cycles on the peak stress, peak strain, Poisson's ratio and uniaxial compressive stress-strain curve of self-compacting concrete are analyzed. The results show that the peak stress decreases with the increase of freeze-thaw cycles, and increases with the increase of freezing and thawing cycles when the peak strain decreases gradually with the increase of freezing and thawing cycles, and the peak strain decreases gradually with the increase of freeze-thaw cycles. Poisson's ratio decreases with the increase of freeze-thaw cycles, and the longitudinal stress-strain curves flatten with the increase of freeze-thaw cycles, and the surrounding area decreases with the increase of freeze-thaw cycles, and the ability of self-compacting concrete to absorb energy becomes weaker.
【作者单位】：新疆大学建筑工程学院;
【基金】：国家自然科学基金资助项目(51368057);国家自然科学基金资助项目(51468061)
【分类号】：TU528.01

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