The increase of coarse aggregate content decreases the shrinkage of concrete, decreases the cost of concrete production as well as reduces the carbon dioxide emission to the environment. In this study, the mixture proportions of PFCC (post-filling coarse aggregate concrete) for C40, C50, and C60 were designed and the comprehensive performances of workability, compressive strength and elastic modulus were conducted experimentally. Then, 15 reinforced concrete columns made by PFCC with different concrete grades and post filling rates (PFR) were designed and tested. The failure mode, load-deflection curve, load-strain curve and load bearing capacity were analyzed and elaborated. Results showed that, compared with the conventional concrete, the compressive strength and elastic modulus of the post filling coarse aggregate concrete were improved, which reached the highest when the post filling rate is 20%. At the same time, the load bearing capacity of column specimen increased first and then decreased as the post filling rate increased, with the transition point being at 10% post filling rate. This study provides reference and research data for technical regulations and design specifications of structural members made of post filling coarse aggregate concrete.

中文翻译：

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环保型后灌粗骨料工艺钢筋混凝土柱轴压试验研究

粗骨料含量的增加减少了混凝土的收缩，降低了混凝土的生产成本，减少了对环境的二氧化碳排放。本研究设计了C40、C50和C60的PFCC（后填充粗骨料混凝土）配合比，并对和易性、抗压强度和弹性模量的综合性能进行了试验。然后，设计并测试了 15 根由 PFCC 制成的具有不同混凝土等级和后填充率 (PFR) 的钢筋混凝土柱。对失效模式、载荷-挠度曲线、载荷-应变曲线和承载能力进行了分析和阐述。结果表明，与常规混凝土相比，后充填粗骨料混凝土的抗压强度和弹性模量均有所提高，后填充率为20%时达到最高。同时，柱试件的承载能力随着后填充率的增加先增加后下降，过渡点在后填充率10%处。本研究为后填充粗骨料混凝土结构构件的技术规范和设计规范提供参考和研究数据。