不同冻融环境下机场道面纤维混凝土力学性能和微观结构劣化试验研究

Experimental Study on the Mechanical Properties and Microstructure Degradation of Fiber Reinforced Concrete for Airport Pavement under Different Freeze-thaw Environments

研究对钢纤维混凝土在5种冻融环境中的抗压强度、抗压强度损失率和SEM进行了分析。结果表明,冻融循环对钢纤维混凝土的影响最为显著的是氯化钠溶液冻融、硫酸钠与氯化钠混合溶液冻融下的混凝土试件;在冻融循环45次、90次和180次时的钢纤维混凝土表面上发现裂纹,由于水冰相变引起的冻胀引起微裂纹的扩展,钢纤维混凝土试件的裂缝宽度和深度随着冻融循环次数的增加而增加。

The study analyzed the compressive strength,compressive strength loss rate,and SEM of steel fiber reinforced concrete in five freeze-thaw environments.The results show that the most significant impact of freeze-thaw cycles on steel fiber reinforced concrete is the concrete specimens subjected to freeze-thaw with sodium chloride solution or a mixture of sodium sulfate and sodium chloride solution;Cracks were found on the surface of steel fiber reinforced concrete after 45,90,and 180 freeze-thaw cycles.The expansion of microcracks was caused by frost heave caused by water ice phase transformation.The crack width and depth of steel fiber reinforced concrete specimens increased with the increase of freeze-thaw cycles.