建筑纤维增强复合水泥耐老化性能试验研究

Experimental study on aging resistance of building fiber reinforced composite cement

为了确定影响建筑纤维增强复合水泥耐老化性能的因素,进行了建筑纤维增强复合水泥耐老化性能试验研究。选择水泥和PVA纤维为实验材料,按照1∶1.5∶0.6的配合比,将水泥、水和纤维混合,制备了厚度分别为10、20、30 cm的建筑纤维增强复合水泥试件,通过模拟紫外光照和高温环境,测试了建筑纤维增强复合水泥试件经过紫外光老化和热老化之后的吸水率、氯离子扩散系数和耐磨度。结果显示,不同厚度水泥试件的吸水率和氯离子扩散系数随着老化时间的延长而增大,耐磨度随老化时间的延长而下降,而且紫外光老化对建筑纤维增强复合水泥耐老化性能的影响较大,水泥试件的耐老化性能在厚度上存在明显差异。

In order to determine the factors affecting the aging resistance of building fiber reinforced composite cement,the aging resistance of building fiber reinforced composite cement was studied.Cement and PVA fiber were selected as experimental materials,and cement,water and fiber were mixed according to the ratio of 1∶1.5∶0.6,and building fiber reinforced composite cement specimens with thickness of 10 cm,20 cm and 30 cm were prepared.The water absorption,chloride diffusion coefficient and wear resistance of building fiber reinforced composite cement specimens after ultraviolet light aging and thermal aging were tested by simulating ultraviolet light and high temperature environment.The results showed that the water absorption rate and chloride ion diffusion coefficient of cement samples with different thicknesses increased with the aging time,but the wear resistance decreased with the aging time.Moreover,ultraviolet aging had a great influence on the aging resistance of building fiber reinforced composite cement,and there were obvious differences in the thickness of the aging resistance of cement specimens.