载荷对掺合料高强混凝土吸水性能的影响

发布时间：2018-06-10 02:50

  本文选题：载荷等级 + 矿物掺合料　； 参考：《建筑技术》2017年03期

【摘要】：对经过0%σ_c,50%σ_c,65%σ_c,80%σ_c(压缩强度极限)4种载荷等级循环加载后的单掺粉煤灰、单掺矿粉和复合掺料混凝土进行吸水性试验研究。观察其表面吸水概貌,分析载荷等级对吸水高度和吸水率参数的影响。结果表明,当载荷小于50%σ_c时,孔隙结构发生弹性变形,微裂纹发展缓慢;当载荷在50%σ_c~65%σ_c范围内,混凝土试件中出现少数裂纹;当载荷大于65%σ_c时,混凝土试件中出现较多数贯穿裂纹;随着载荷等级增大,混凝土的吸水高度和吸水率明显增大,吸水高度h与t~(1/2)呈负指数关系。
[Abstract]:An experimental study on water absorption of concrete with single fly ash, mineral powder and compound admixture was carried out after cyclic loading of 80% 蟽 C (compressive strength limit), 50% 蟽 C, 65% 蟽 C, 65% 蟽 C, and 80% 蟽 C (compressive strength limit) after cyclic loading with coal ash, mineral powder and compound admixture concrete. The surface water absorption profile was observed and the influence of load grade on water absorption height and water absorption rate parameters was analyzed. The results show that when the load is less than 50% 蟽 _ C, elastic deformation occurs in the pore structure and the micro-crack develops slowly; when the load is in the range of 50% 蟽 _ c, 65% 蟽 _ c, a few cracks appear in the concrete specimen, and when the load is greater than 65% 蟽 _ c, there are a few cracks in the concrete specimen. With the increase of load grade, the water absorption height and water absorption rate of concrete obviously increase, and the water absorption height h has a negative exponential relationship with t ~ (1 / 2).
【作者单位】： 徐州工程学院土木工程学院;
【基金】：江苏省“333工程”科研项目(BRA2015065) 住房和城乡建设部科技计划项目(2011-K6-15)
【分类号】：TU528
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本文编号：2001722