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采用慢冻法,对LC35纤维轻骨料混凝土进行25次、50次、75次、100次、125次、150次、200次、225次、250次、275次、300次冻融循环,利用压力机及动弹仪,测得了不同冻融循环后混凝土的抗压强度及弹性模量。根据试验结果,得到不同纤维轻骨料混凝土的抗压强度与冻融循环次数的关系、冻融后的损伤度及损伤增量,同时得出不同纤维对轻骨料混凝土性能的改善作用也不尽相同,对抗冻性能的改善顺序依次为:混合纤维>聚丙烯纤维>钢纤维,研究成果可为西北寒冷地区轻骨料混凝土的研究与应用提供实验依据和理论依据。
The LC35 fiber lightweight aggregate concrete was subjected to 25 times, 50 times, 75 times, 100 times, 125 times, 150 times, 200 times, 225 times, 250 times, 275 times and 300 times of freeze-thaw cycles Presses and striker, measuring the compressive strength and elastic modulus of concrete after different freeze-thaw cycles. According to the test results, the relationship between the compressive strength of concrete with different fiber lightweight aggregate concrete and the number of freeze-thaw cycles, the degree of damage after freeze-thaw and the increment of damage were obtained. At the same time, the effect of different fibers on the properties of lightweight aggregate concrete The order of improvement for frost resistance is as follows: mixed fiber> polypropylene fiber> steel fiber. The research results can provide experimental basis and theoretical basis for the research and application of lightweight aggregate concrete in the cold region of Northwest China.