摘要
石粉对混凝土性能的影响一直存在争议,其含量的确定是机制砂混凝土研究的热点问题之一。以中低强度等级、不同流动性能的混凝土为研究对象,对比研究了石灰岩机制砂的石粉含量对混凝土坍落度、抗压强度的影响规律。试验结果表明,混凝土的类型不同,在坍落度、抗压强度为最佳值时,机制砂的石粉含量也不同,分别为5%、10%、20%,但对应的水粉比均为0.4。由此推断,在进行中低强度等级机制砂混凝土设计时,可采用水粉比0.4来预测机制砂的最佳石粉含量。
There are some controversies on influences of stone powder on performances of concrete,and its content determination is one of the hot issues of manufactured fine aggregate（MFA） concrete.Slump and compressive strength of limestone MFA concrete were analyzed on contents of stone powder for middle-low strength and different flowability concrete.The experiment results show that there are different optimums percent of stone powder of MFA,such as 5,10,and 20 for different types of concrete,but the water-powder ratio for them is 0.4.It is concluded that optimum percent of stone powder may be predicted by water-powder 0.4 for middle and low strength MFA concrete.
出处
《土木建筑与环境工程》
CSCD
北大核心
2012年第5期154-158,共5页
Journal of Civil,Architectural & Environment Engineering
基金
国家自然科学基金资助(50908076)
河南省教育厅自然科学研究计划项目(2010A560009)
关键词
机制砂
混凝土
石粉含量
水粉比
manufactured fine aggregate（MFA）
concrete
content of aggregate micro fines（CAMF）
water-powder ratio
