随着我国城市化和现代化建设的快速发展,大量老旧建筑的拆除、改造会产生大量的建筑废料,其中粘土砖的占比约为40%。将废旧粘土砖破碎、筛分处理后制得再生砖骨料,使用该骨料拌制的再生混凝土称为再生砖骨料混凝土(Recycled Brick Aggre...随着我国城市化和现代化建设的快速发展,大量老旧建筑的拆除、改造会产生大量的建筑废料,其中粘土砖的占比约为40%。将废旧粘土砖破碎、筛分处理后制得再生砖骨料,使用该骨料拌制的再生混凝土称为再生砖骨料混凝土(Recycled Brick Aggregate Concrete, RBAC)。从砖骨料基本性能、RBAC力学性能、RBAC性能影响因素以及骨料强化方法4个方面综述了再生砖骨料和RBAC的研究现况,并从骨料大规模制备、骨料强化标准、混凝土性能优化、试件长期性研究几个方面提出对未来的展望。With the rapid development of urbanization and modernization in our country, a large number of old buildings are demolished and renovated, resulting in a significant amount of construction waste, with clay bricks accounting for about 40% of this waste. Recycled brick aggregate is obtained by crushing and screening waste clay bricks, and the concrete prepared with this aggregate is called Recycled Brick Aggregate Concrete (RBAC). This paper reviews the current state of research on recycled brick aggregate and RBAC from four aspects: the basic properties of brick aggregate, the mechanical properties of RBAC, the factors affecting the performance of RBAC, and methods of aggregate reinforcement. It also proposes future prospects in terms of large-scale production of aggregates, standards for aggregate reinforcement, optimization of concrete performance, and long-term research on specimens.展开更多
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,...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.展开更多
文摘随着我国城市化和现代化建设的快速发展,大量老旧建筑的拆除、改造会产生大量的建筑废料,其中粘土砖的占比约为40%。将废旧粘土砖破碎、筛分处理后制得再生砖骨料,使用该骨料拌制的再生混凝土称为再生砖骨料混凝土(Recycled Brick Aggregate Concrete, RBAC)。从砖骨料基本性能、RBAC力学性能、RBAC性能影响因素以及骨料强化方法4个方面综述了再生砖骨料和RBAC的研究现况,并从骨料大规模制备、骨料强化标准、混凝土性能优化、试件长期性研究几个方面提出对未来的展望。With the rapid development of urbanization and modernization in our country, a large number of old buildings are demolished and renovated, resulting in a significant amount of construction waste, with clay bricks accounting for about 40% of this waste. Recycled brick aggregate is obtained by crushing and screening waste clay bricks, and the concrete prepared with this aggregate is called Recycled Brick Aggregate Concrete (RBAC). This paper reviews the current state of research on recycled brick aggregate and RBAC from four aspects: the basic properties of brick aggregate, the mechanical properties of RBAC, the factors affecting the performance of RBAC, and methods of aggregate reinforcement. It also proposes future prospects in terms of large-scale production of aggregates, standards for aggregate reinforcement, optimization of concrete performance, and long-term research on specimens.
文摘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.
