摘要
添加不同体积比的玻璃纤维,按照一定比例配制玻璃纤维增强磷酸镁水泥。研究了玻璃纤维增强磷酸镁水泥的抗压强度、抗折强度以及耐水性,并采用电镜扫描的方法对其微观结构进行了观察。研究结果表明,玻璃纤维对磷酸镁水泥的抗压强度和抗折强度都有一定贡献,其中纤维的最佳体积掺量约为2.5%,但超过最佳掺量后,抗压和抗折强度都有所降低。另外,实验结果还表明,稍过量的玻璃纤维能够暂时"包裹"未反应基材,可能在浸水环境中发生又一轮反应,从而抵消因浸水造成的强度损失,这可能是一种改善磷酸镁水泥耐水性的新方法。此外,本工作提供了与实验结果一致的纤维增强机理的可能解释。
An experimental investigation into the compressive strength,the flexural strength and the water resistance of magnesium phosphate cement(MPC)mortar reinforced by glass fiber was conducted.Four fiber volume fractions of 1.5%,2.5%,3%,3.5%were designed for the experiments.The microstructure,mechanical and water resistance properties of fiber-reinforced MPCs were evaluated with respect to the variance in the fiber volume fraction.The results showed that the glass fibers had more pronounced effects on the flexural strength compared to compressive strength.The optimum volume fraction of glass fiber was reported at 2.5%.Furthermore,the effect of glass fiber on the water resistance of MPC was discussed,and a“reserving”method to resist the strength loss by water was provided.In addition,a possible explanation of the fiber reinforcement mechanism which is in agreement with the experimental results was proposed.
作者
方圆
陈兵
FANG Yuan;HEN Bing(College of Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2017年第24期6-9,39,共5页
Materials Reports
基金
国家自然科学基金(51778363)
关键词
玻璃纤维
磷酸镁水泥
抗压强度
抗折强度
耐水性
glass fiber
magnesium phosphate cement
compressive strength
flexural strength
water resistance
