纤维混凝土抗冻性能研究

Study on frost resistance of fiber reinforced concrete

为研究冻融循环条件下纤维混凝土抗冻性能,采取快速冻融试验对不同掺加方式下钢纤维、聚丙烯纤维混凝土性能进行研究。并通过SEM分析了其微观结构。试验结果表明,在纤维掺量固定时,不同纤维掺加方式的混凝土性能有显著不同。随冻融循环次数的增加,其质量损失、动弹性模量、抗压、抗折强度都有显著不同变化,混杂纤维混凝土性能较单一纤维混凝土好,层布式纤维混凝土性能较整体式纤维混凝土好。

In order to study the frost resistance performance of fiber reinforced concrete under freeze-thaw cycle, the performance of steel fiber and polypropylene fiber concrete under different mixing methods was studied by rapid freezing and thawing test. And its microstructure was analyzed by SEM. The test results show that the concrete properties of different fibers were significantly different when the fiber content was fixed. With the increase of the number of freeze-thaw cycles, the mass loss, the dynamic elastic modulus, the compression strength and the flexural strength had different changes. The performance of the hybrid fiber concrete was better than that of the single fiber concrete and the layer fabric fiber. The performance of layered fiber reinforced concrete was better than that of integral fiber reinforced concrete.