摘要
通过考察细粉(石粉和泥粉)对水泥砂浆工作性、抗压强度和干燥收缩的影响,研究了机制砂中细粉的危害性,提出了基于细粉特性和含量的改进MB值(亚甲蓝值),并分析了采用该指标评价细粉危害性的可行性.结果表明:机制砂中石粉含量较高,其危害性极其有限;泥粉含量较低,但危害性较大.细粉的危害性不仅与其含量有关,更取决于其矿物特性.改进MB值与水泥砂浆工作性、抗压强度和干燥收缩均存在较强相关性,可用于评价细粉危害性.
Harmfulness of various microfines in manufactured sand was studied by investigating effects of microfines on workability,compressive strength and drying shrinkage of cement mortars.A modified methylene blue（MB）value based on microfine characteristic and content was proposed.Meanwhile,feasibility of employing the index of modified MB value to evaluate microfine harmfulness was also analyzed.The results indicate that harmfulness of stone powder is quite limited though its content is relatively high,while that of clay is considerable though clay content is low,which confirms that harmfulness of microfines is not only related with microfine content but depended more on microfine mineralogy;strong correlation is found between modified MB value and workability,drying shrinkage and compressive strength of cement mortar,so it can be applied in evaluating microfine harmfulness.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2015年第1期150-155,共6页
Journal of Building Materials
基金
西部交通建设科技项目(2009318811082)
关键词
细粉
亚甲蓝(MB)值
机制砂
集料
砂浆
microfine
MB（methylene blue）value
manufactured sand
aggregate
mortar
