尾矿砂石混凝土的干缩性能研究

Investigation of drying shrinkage of concrete prepared with iron mine tailings

分别以铁尾矿砂和铁尾矿石代替天然砂和普通碎石配制了C30和C60两个强度等级的混凝土。测定了试件在自然养护条件下的干燥收缩率。结果表明,不论是C30等级,还是C60等级,尾矿砂石混凝土的干燥收缩率均小于天然砂石混凝土的收缩率。不论是天然砂石混凝土,还是尾矿砂石混凝土,C60强度等级的混凝土的干燥收缩率均大于C30强度等级的混凝土。

Concretes of C30 and C60 were prepared with iron mine tailings as fine aggregate and coarse aggregate and with natural sand and common crushed stone separately.The drying shrinkage of concretes cured under the natural condition in the laboratory was tested.The results showed that whether C30 or C60 the shrinkage of concrete prepared with iron mine tailings was a little smaller than that of concrete with natural sand and common crushed stone.It was also found that whether the concrete with iron mine tailings or the concrete with natural sand and common crushed stone the shrinkage of C60 concrete was larger than that of C30 concrete.