Study on flexural behavior of CO2 cured recycled coarse aggregate concrete steel bar trusses composite slab

IF 6.5 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials Pub Date : 2025-06-19 DOI:10.1016/j.cscm.2025.e04940

Yueqing Gao , Sijie Shen , Ke Ye , Zeshen Li , Wei Wang , Jingyi Lu , Shaodan Hou , Yangyang Yin , Chaofeng Liang

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引用次数: 0

Abstract

The effects of aggregate carbonation, overall specimen carbonation, and the combined method of aggregate carbonation and overall specimen carbonation on the mechanical properties of recycled coarse aggregate concrete (RAC) were investigated. Furthermore, the flexural behaviors of steel bar trusses composite slab (SBTCS) prepared by RAC and cured by the three carbonation methods were studied through experiments and numerical analysis. The results indicated that: (1) The mechanical properties of RAC after carbonation were significantly improved, and the concrete prepared by the combined method of aggregate carbonation and overall specimen carbonation showed the highest strength. (2) The stress-strain constitutive models of RAC under different carbonation methods were built according to the experimental results. (3) The failure modes of the carbonated concrete SBTCSs were basically consistent and the precast layer and the cast-in-situ layer deformed coordinately during the loading process. (4) The SBTCS prepared by the combined method of aggregate carbonation and overall specimen carbonation showed the best bending performance, and the ultimate load bearing capacity increased by 16.2 % compared to the SBTCS made by non-carbonated RAC. (5) The load-displacement curves and damage contours of the SBTCSs obtained from the numerical analysis were in good agreement with the experimental results, and the maximum deviation between the simulated ultimate load and the experimental value was 8.8 %.

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CO2固化再生粗骨料混凝土钢筋桁架组合板抗弯性能研究

研究了骨料碳化、整体试件碳化以及骨料碳化与整体试件碳化联合方法对再生粗骨料混凝土（RAC）力学性能的影响。通过试验和数值分析，研究了RAC制备的钢筋桁架组合板（SBTCS）经三种碳化方法固化后的抗弯性能。结果表明：(1)碳化后RAC的力学性能得到显著改善，骨料碳化与整体试件碳化相结合制备的混凝土强度最高。(2)根据实验结果，建立了不同碳化方式下RAC的应力-应变本构模型。(3)碳化混凝土sbtcs在加载过程中破坏模式基本一致，预制层和现浇层变形协调。(4)骨料碳化与试件整体碳化相结合制备的SBTCS抗弯性能最佳，极限承载力比未碳化RAC制备的SBTCS提高16.2 %。(5)数值分析得到的sbtcs的荷载-位移曲线和损伤轮廓与试验结果吻合较好，模拟极限荷载与试验值的最大偏差为8.8 %。

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来源期刊

Case Studies in Construction Materials Multiple-

CiteScore

7.60

自引率

19.40%

发文量

842

审稿时长

63 days

期刊介绍： Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.