非洲磨细天然火山灰对混凝土收缩抗裂性能的影响研究  

Research on the influence of Africa pozzolan on shrinkage and crack resistance of concrete

作　　者：沈玉山 温欣岚 夏京亮[2] 杨芳娃 李涛[3] 周永祥[2] 宋普涛[2] 

机构地区：[1]中国路桥工程有限责任公司,北京100011 [2]中国建筑科学研究院,北京100013 [3]中交第二公路工程局有限公司海外事业部,陕西西安710065

出　　处：《建筑科学》2017年第3期46-50,共5页Building Science

基　　金："十三五"国家科技支撑计划项目课题"利用火山灰渣制备绿色建筑材料关键技术研究与应用"2016YFC0701002

摘　　要：研究两种非洲磨细天然火山灰材料单掺以及与粉煤灰复掺对混凝土收缩抗裂性能的影响。结果表明:磨细凝灰岩增大了混凝土的早期收缩,而磨细火山渣可以有效降低混凝土早期收缩;掺加两种磨细天然火山灰均能降低混凝土长期收缩和水化温升;两种天然火山灰和粉煤灰均对混凝土抗裂性能有所提升,提升效果方面粉煤灰大于磨细火山渣,磨细火山灰大于磨细凝灰岩,磨细火山渣与粉煤灰复掺与单掺等量粉煤灰对混凝土抗裂性能的改善效果相当。The effects of two kinds of African natural volcanic resistance of concrete are studied. The results show that： the ash or mixed with fly ash on the shrinkage and crack grinding fine tuff can increase the early shrinkage of concrete, while the fine grinding cinder would decrease the early shrinkage of concrete; adding two kinds of pozzolan can reduce the long-term shrinkage and hydration temperature rise; two type of pozzolan and fly ash can both enhance the crack resistance of concrete, the fly ash has the better effect than the fine grinding cinder, while the effect of fine grinding cinder is better than that of grinding fine tuff, so the influence of fine grinding cinder mixed with fly ash to the anti-cracking performance of concrete is close to fly ash merely.

关 键 词：磨细天然火山灰 非接触收缩 长期收缩 平板抗裂 

分 类 号：TU521.21[建筑科学—建筑技术科学]