掺粘土砖再生骨料钢筋混凝土柱的小偏心受压性能分析
Analysis of Small Eccentric Compression Performance of Recycled Aggregate Reinforced Concrete Column Mixed with Clay Brick

通过混凝土柱的小偏心受压性能试验，对三根不同偏心距砖骨料再生混凝土柱和一根相同原材料且同强度的普通骨料混凝土柱进行研究。砖骨料再生混凝土强度按照C30、砖骨料替代率为35% (砖骨料质量占所有粗骨料的质量比例)进行配合比设计，水灰比、骨料用量、用水量与普通混凝土构件不同。分析砖骨料再生混凝土柱和同强度普通骨料混凝土柱在受力过程、破坏特征、变形能力与承载力等方面的差异。试验结果发现：砖骨料再生混凝土柱从加载到破坏的过程中具有和普通混凝土柱相似的受力阶段和破坏形态。相同的偏心距与同强度的普通骨料混凝土柱相比，略有降低，但承载力变化不大，可能因为砖骨料表面有较多缺陷和微裂缝且二次利用，导致强度难以满足要求。
Three brick aggregate recycled concrete columns with different eccentric distances and one ordinary aggregate concrete column with the same raw material and the same strength were studied through the small eccentric compression performance test of the concrete column. The strength of the recycled concrete of brick aggregate is designed according to C30 and the replacement rate of brick aggregate is 35% (the quality of brick aggregate accounts for the quality ratio of all coarse aggregate). The water-cement ratio, aggregate consumption and water consumption are different from ordinary concrete components. The study analyzed the differences between brick aggregate recycled concrete columns and ordinary aggregate concrete columns of the same strength in terms of stress process, failure characteristics, deformation capacity and bearing capacity. The test results show that the recycled concrete column of brick aggregate has a similar stress stage and failure form to the ordinary concrete column. Compared with the ordinary aggregate concrete column of the same strength, the same eccentric distance is slightly reduced, but the bearing capacity does not change much. It may be because the brick aggregate surface has many defects and microcracks and secondary utilization, making it difficult to meet strength requirements.