The expansive behaviors of the expensive concrete under different restraining conditions were systemically studied.The experimental results indicate that expansive deformation obviously increases before 10 days and tends to be constant after 25 days regardless of the restraining conditions.The mixture ratio of expansive cement and restraining conditions are the main factors affecting expansive deformation.Self-stress can be obtained when the expansive deformation is restrained.The higher self-stress could be obtained when the expensive concrete is restrained by steel tube.For specimens under steel tube restraining,the wall thickness and the length of the steel tube have important influence on self-stress.Both the radial self-stress and axial self-stress in concrete core increase when wall thickness or length of the steel tube increases.
参考文献
| [1] | Peiyu Yan;Xiao Qin .The effect of expansive agent and possibility of delayed ettringite formation in shrinkage-compensating massive concrete[J].Cement and Concrete Research,2001(2):335-337. |
| [2] | Chang Xu;Lin Haixiao;Huang Chengkui .Experimental Study On Shear Resistance Of Self-stressing Concrete Filled Circular Steel Tubes[J].Journal of Constructional Steel Research,2009(4):801-807. |
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