铁尾矿-钢渣集料混凝土力学性能及体积稳定性试验研究

Experimental Study of Mechanical Properties and Volume Stability of Iron Tailing-Steel Slag Aggregate Concrete

采用铁尾矿砂取代河砂充当混凝土细集料、钢渣取代碎石充当混凝土粗集料配制铁尾矿-钢渣集料水泥混凝土,并对混凝土强度、早期抗裂性能和长期体积变形等性能进行试验研究。结果表明:铁尾矿砂充当细集料不利于混凝土强度,而当钢渣以小掺量加入铁尾矿砂混凝土时,可以减弱铁尾矿砂对混凝土强度的劣化效应;适当掺量铁尾矿砂可以抑制由钢渣引起的混凝土膨胀变形,从而提高钢渣混凝土的早期抗裂性能与体积稳定性。

Sands were partially replaced by iron tailings as fine aggregates and stones were partially replaced by steel slags as coarse aggregates to prepare iron tailing-steel slag concrete in this research.And the strength,early crack resistance and long-term volume deformation of iron tailing-steel slag concrete were tested.The results show that iron tailings have negative effect on concrete strength when used as fine aggregates and steel slags are beneficial to concrete strength with a small adding amount.In addition,iron tailings with proper adding amount can inhibit the deformation of concrete caused by steel slags,in consequence of which early crack resistance and volume stability of concrete are improved.