钢板混凝土组合剪力墙早期裂缝试验研究

Early Crack Experiments of Steel Plate Concrete Composite Shear Wall

针对钢板混凝土组合剪力墙结构早期开裂问题,设计了混凝土中掺加膨胀剂、内养护剂、钢纤维、膨胀剂与内养护剂复掺4种情况下的早期收缩及早期平板约束开裂试验,以此来研究钢板混凝土组合剪力墙中高强高性能混凝土的抗裂减缩效果。结果表明:膨胀剂、内养护剂、钢纤维、膨胀剂与内养护剂复掺都可以降低混凝土的早期收缩;膨胀剂与内养护剂复掺明显改善了膨胀剂的膨胀效果,使混凝土的膨胀应变及膨胀时间得到显著提升,降低28d收缩达87.6%,且混凝土早期开裂时间推迟,裂缝宽度和数量都明显降低。本文的研究结果为钢板混凝土组合剪力墙早期裂缝的控制提供了参考。

The early shrinkage and early flat restraint cracking experiments of concrete were designed to study the crack resistance and shrinkage-reducing performance of high strength and high performance concrete in steel plate concrete composite shear wall. Four kinds of conditions were considered in the experiment, such as adding expansive agent, internal curing agent, steel fiber and the mixture of expansive agent and internal curing agent. The results show that the early shrinkage of concrete can be reduced by adding expansive agent, internal curing agent, steel fiber and the mixture of expansive agent and internal curing agent. And for the mixture of expansive agent and internal curing agent, it significantly improves the expansion effect of the expansive agent, so that the expansion strain and the expansion time of the concrete are increased,and the 28 d shrinkage is reduced by 87. 6%. It also makes the concrete early cracking time delay, the crack width and number are significantly reduced. These results are good references for the the control of the early crack of steel plate concrete composite shear wall.