MgO钢管自应力混凝土试验研究

通过大剂量添加MgO膨胀剂,利用MgO膨胀产生的自应力成功解决了钢管混凝土结构普遍存在的脱粘问题.实验研究了添加MgO膨胀剂混凝土的约束膨胀性能.试验结果表明MgO膨胀剂具有很好的膨胀性能和理想的长期稳定性,在钢管的约束作用下,产生了较高的自应力值,使核心混凝土受压承载力提高,同时使核心混凝土内部更为致密.

Experimental Research on Uusing MgO Expansion Agent Self-stressing Concrete-filled Steel Tube

By using high content of MgO expansion agent which produces self-stress,the problem of interface disengaging is solved.Experimental research on using MgO expansion agent self-stressing concrete-filled steel tube is carried out.The experimental results indicate that the characteristic of delayed expansion of MgO expansion agent can ensure the expansive deformation,keep the self-stress stable for a long time.MgO expansion agent can produce high value of self stress by restraint of steel tube,and thus enhance the ultimate strength of concrete core subjected to axial compressive loading.Meanwhile,the self-stress can further the compaction rate of concrete core.