堆石混凝土(rock-filled concrete,RFC)独特的施工技术导致其缺陷与传统混凝土不一样.通过物理试验与真实破坏过程分析(realistic failure process analysis,RFPA)数值模拟探讨了堆石混凝土中堆石与自密实混凝土(self-compacting concrete,SCC)胶结面缺陷及自密实缺陷对其抗压性能的影响.结果表明:随着缺陷数量的增加,堆石混凝土的无侧限抗压强度下降.同等缺陷数量下,胶结面缺陷试件的抗压强度低于自密实缺陷试件.同时,声发射分析显示,胶结面缺陷试件破坏所需能量更低,表明胶结面缺陷对材料力学性能有更为显著的负面影响.这些发现为理解和改善堆石混凝土结构设计与耐久性提供了重要参考.
Effect of Cement Surface Defects on Compressive Strength of Rock-Filled Concrete
The unique construction technique of rock-filled concrete causes its defects to be different from those of conventional concrete.We investigate the effects of defects in the cementing surface of stacked stone and self-compacting concrete and the defects in self-compacting concrete on the compressive properties of rock-filled concrete through physical tests and RFPA(realistic failure process analysis)numerical simulations.The result shows that the unconfined compressive strength of rock-filled concrete decreases with the increase of the number of defects.For the same number of defects,the compressive strength of cementitious surface defect specimens was lower than that of self-compacting defect specimens.Also,acoustic emission analysis reveals that the energy required to destroy specimens with defects in the cement surface is lower,indicating that defects in the cement surface have a more significant negative impact on the mechanical properties of materials.These findings facilitates understanding and improving the design and durability of rock-fill concrete structures.
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