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中文摘要：
为了简化废弃混凝土的循环利用过程,笔者所在课题组提出了采用明显大于传统再生骨料的大尺度废弃混凝土的再生混合构件概念,将废弃混凝土循环利用从骨料层次（不大于40 mm）提升为大尺度的块体或节段层次（块体尺寸为50～300 mm;节段尺寸长度方向大于500mm）.简要回顾和总结了笔者及笔者所带领的课题组近年来在再生混合构件方面的研究成果,介绍了其在工程中的初步应用,并指出了再生混合构件今后的研究发展方向.研究和应用表明：废弃混凝土大尺度回收利用省去了再生骨料的繁琐生产过程及二次能源消耗,经济性优于骨料层次的回收利用;再生混合构件的基本性能和抗震性能总体上接近或略低于全现浇混凝土构件;基于新、旧混凝土组合强度的概念,现行规范有关全现浇混凝土构件的计算公式可直接或略作修正后应用于再生混合构件的设计计算;再生混合构件特别是外置薄壁型钢再生混合构件应用于实际工程完全可行,是废弃混凝土循环利用的一条有效途径.
英文摘要：
In order to simplify the recycling process of demolished concrete, the authors and their team have pro- posed the concept of the regeneration structural members containing the demolished concrete with a significantly lar- ger size than those of conventional recycled aggregates. In the proposed structural members, the recycling of the de- molished concrete is promoted fi＇om an aggregate level of not more than 40 mm to a distinctly larger size level of 50 - 300 mm for the demolished concrete blocks （DCBs） or of more than 500ram in the length direction for the demo- lished concrete segments （DCSs）. This paper presents a brief review of the studies conducted by the authors and their team on the proposed structural members in recent years, and introduces preliminary engineering applications of these members to real-life structures. Moreover, the research and development orientation of the proposed struc- tural members is pointed out. The results of the studies and applications indicate that （ 1 ） the method of recycling demolished concrete through the proposed members not only simplifies the tedious production process of the recycled aggregates but also reduces the corresponding secondary energy consumption, so the method is more economical than that of using the recycled aggregates; （2） the fundamental properties and seismic performance of the proposed members are close to or slightly inferior to those of the counterpart members made only from cast-in-situ concrete; （3） based on the concept of the combined strength of the new and old concrete used in the proposed members, the formulas specified in current design codes for members made only from east-in-situ concrete can be applied to the proposed members directly or after a slight modification; and （4） applying the proposed structural members, espe- cially the thin-walled steel-concrete composite members containing large-size demolished concrete, to practical engi- neering is feasible and dependable, so it is an effective approach to the dem
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