粉煤灰和PVA纤维复掺水泥基材料微观机理分析  

Micro-mechanism Analysis on Cement-based Materials with Fly Ash and PVA Fiber

作　　者：何芸[1,2] 何真[2] 孙海燕[2,3] 

机构地区：[1]江西宜春市水利局,江西宜春336000 [2]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [3]云南农业大学水利水电与建筑学院,云南昆明650201

出　　处：《水利与建筑工程学报》2014年第5期205-210,共6页Journal of Water Resources and Architectural Engineering

摘　　要：目前关于粉煤灰对PVA纤维与基体间粘结界面,以及对直接拉伸和韧性的影响研究还较少,通过采用PVA纤维、粉煤灰两种材料复掺,研究制备出一类具有超高抗拉韧性和优异裂缝无害化分散能力的纤维增韧水泥基材料。采用扫描电镜从微观机理上对其增韧机理进行了深入剖析,研究结果表明,采用纤维与粉煤灰复掺的方式,既能控制好纤维与基体界面之间的特征参数即化学粘结强度和摩擦粘结强度,保证硬化水泥石具有良好的化学粘结强度,同时又利用粉煤灰的颗粒微珠效应使其不至过高,从而使滑移-硬化效应更好地得以发挥。At present ,there’s only a few research of the influences of adding fly ash on the bonding interface between PVA fiber and matrix as well as the direct tensile and toughness .Accordingly ,a toughness-enhanced cement-based mate-rial was developed by mixing PVA fiber and fly ash .This material possesses excellent properties of ultra-high tensile toughness and dispersive capacity of anti-crack treatment .SEM was adopted to analyse the toughness-enhancing property of PVA fiber from the perspective of micromechanism .The results indicate that by adding PVA fiber and fly ash ,the pa-rameters of bond strength between fiber and matrix ,which are chemical bond strength and friction bond strength ,can be well controlled ,thus the hardened set cement is given excellent chemical bond strength ,which is controlled from exceed-ing a certain level by the microsphere effect of the fly ash .This will give full play in effect of sliding and strain hardening of PVA fiber .

关 键 词：聚乙烯醇(PVA)纤维 粉煤灰 增韧 多裂缝开裂 化学粘结强度 摩擦粘结强度 

分 类 号：TU502[建筑科学—建筑技术科学]