CAJ | 학술논문

为探讨将废弃混凝土反复循环再生用作结构混凝土粗骨料的可行性,试验研究了5个系列普通混凝土经二次循环制备的再生混凝土粗骨料性能。分析了其矿物与化学成分,并依据不同的粗骨料质量等级标准对试验结果进行了等级评定。结果表明：随着循环次数增加,再生混凝土粗骨料表观密度、堆积密度与吸水率降低,压碎值、吸附的砂浆质量分数与微粉质量分数增大；第二次循环再生混凝土粗骨料性能指标趋于稳定,化学成分中 CaO 质量分数增大了49.7%,SiO2与Al2 O3质量分数降低了33.90%与9.78%,满足RILEM、英国BS 标准和国标GB/T 25177-2010中结构混凝土用粗骨料性能要求。
위탐토장폐기혼응토반복순배재생용작결구혼응토조골료적가행성,시험연구료5개계렬보통혼응토경이차순배제비적재생혼응토조골료성능。분석료기광물여화학성분,병의거불동적조골료질량등급표준대시험결과진행료등급평정。결과표명：수착순배차수증가,재생혼응토조골료표관밀도、퇴적밀도여흡수솔강저,압쇄치、흡부적사장질량분수여미분질량분수증대；제이차순배재생혼응토조골료성능지표추우은정,화학성분중 CaO 질량분수증대료49.7%,SiO2여Al2 O3질량분수강저료33.90%여9.78%,만족RILEM、영국BS 표준화국표GB/T 25177-2010중결구혼응토용조골료성능요구。
To evaluate the feasibility of using the repeatedly recycled concrete as the coarse aggregate for structural concrete,the properties of recycled coarse aggregate prepared by recirculation of five series of natural aggregate concrete mixtures are researched. Their mineral and chemical compositions are analyzed,and the experimental results are graded according to different quality grade standards of coarse aggregate. The results show:with the increase of the recycling number,the apparent density, bulk density and water absorption ratio of the recycled coarse aggregate reduce,and the mass fraction of the attached mortar content and powder content and the crushing value increase. The performance indexes of the second repeatedly recycled coarse aggregate are steady. The mass fraction of CaO increases 49. 7%,the mass fractions of Al2 O3 and SiO2 decrease 33. 90% and 9. 78%,which satisfy the performance requirements of coarse aggregate for structural concrete of RILEM, BS standard of the United Kingdom and GB/T 25177-2010 .