掺钢和玄武岩纤维混凝土的冻融循环试验研究  

Experimental study on freeze-thaw cycling of concrete mixed with steel and basalt fiber

作　　者：杨益[1] 宁翠萍[1] 程瑞芳[1] 李萍萍[1] 

机构地区：[1]杨凌职业技术学院建筑工程分院,陕西杨凌712100

出　　处：《水资源与水工程学报》2017年第4期182-186,192,共6页Journal of Water Resources and Water Engineering

基　　金：杨凌职业技术学院自然科学研究基金项目(A2015014)

摘　　要：钢纤维和玄武岩纤维能够有效提高混凝土耐久性,利用冻融循环试验,对掺钢和玄武岩纤维的混凝土抗冻性能及其冻融损伤计算模式进行研究。试验结果表明:混凝土抗冻性受到纤维种类和纤维体积掺量影响明显,当掺加体积率1.5%钢纤维和0.05%玄武岩纤维时混凝土抗冻性能最优,可达到F250等级水平。并对混凝土的冻融损伤机理和纤维的增强作用进行深入分析,确定了基于相对动弹性模量的冻融损伤计算模式和基于冻融累积损伤的冻融损伤计算模式。经过试验数据的对比分析,得出基于相对动弹性模量的冻融损伤计算模式精度更高,拟合而成的一元二次函数衰减模式比指数函数衰减模式具有更高的精度,相关系数均达到0.99以上,更适合用来预测纤维混凝土的冻融耐久性。Steel fiber and basalt fiber can effectively improve the durability of concrete.Using the freeze-thaw cycle test, the steel and basalt fiber reinforced concrete frost resistance and freeze-thaw damage calculation model were studied.The results show that the frost resistance of concrete is obviously affected by the fiber type and fiber volume.When the volume fraction is 1.5% steel fiber and 0.05% basalt fiber, the frost resistance of concrete is the best, which can reach the level of F250.The freezing and thawing damage mechanism and the enhancement of fiber were analyzed, which determined the freeze-thaw damage calculation model based on relative elastic modulus and freeze-thaw cumulative damage.Based on the comparative analysis of the experimental data, it is concluded that the freeze-thaw damage calculation model based on the relative dynamic elastic modulus is more accurate.The decay mode of the quadratic function is better than that of the exponential function decay mode.The correlation coefficient of the quadratic function decay mode reached 0.99 or higher, which is more suitable for predicting the freeze-thaw durability of fiber concrete.

关 键 词：钢纤维 玄武岩纤维 混凝土 冻融循环试验 损伤计算模式 相对动弹性模量 冻融累积损伤 

分 类 号：TU528.572[建筑科学—建筑技术科学] TU502