不同孔隙率的碾压混凝土力学性能试验研究

Experimental study on mechanical properties of RCC with different porosity

混凝土的破坏受其内部缺陷影响,为了研究孔隙含量对碾压混凝土力学性能的影响,探讨碾压混凝土的力学性能和尺寸效应随孔隙率的变化规律,采用预制孔隙法模拟碾压混凝土中的孔隙开展力学性能试验,分析3种尺寸C20碾压混凝土试件在4种不同孔隙率情况下的抗压强度和劈拉强度的变化情况。结果表明:同一尺寸下,C20碾压混凝土的抗压强度和劈拉强度随着孔隙率增加逐渐降低,碾压混凝土孔隙含量增加对其强度产生了负面影响;碾压混凝土拥有明显的尺寸效应,孔隙率越大,碾压混凝土强度的尺寸效应越显著。

The damage of concrete is affected by its internal defects.In order to study the influence of the porosity content on the mechanical properties of RCC and discuss the mechanical properties of roller compacted concrete and size effect as the rule of variation of porosity,the pore of roller compacted concrete is simulated by using pore method for mechanical properties test.We analyze three-dimensional C20 roller compacted concrete specimen under the condition of four different porosity of compressive strength and splitting tensile strength of the changes.The results show that at the same size,the compressive strength and splitting strength of C20 RCC decrease gradually with the increase of porosity,and the increase of pore content has a negative effect on the strength.RCC has an obvious size effect:with the increase of porosity,the size effect of RCC strength becomes more significant.