CAJ | 학술논문

为了探讨废弃再生混凝土作骨料制备结构混凝土的可行性，从强度性能入手，首先用加速碳化试验制备了相当于在保护层混凝土碳化引起钢筋锈蚀的一般环境下先后使用了2个50年的循环再生混凝土骨料，然后试验分析了循环再生混凝土强度与循环再生骨料取代方式及取代率之间的关系。结果表明：仅用循环再生粗骨料取代天然粗骨料的循环再生混凝土立方体抗压强度和劈裂抗拉强度与循环再生粗骨料取代率均呈三次抛物线关系，但拐点（最优与最不利取代率）与合理取代区间不一致；仅用循环再生细骨料取代天然细骨料及循环再生粗细骨料同时取代天然骨料条件下，强度与循环再生细骨料取代率、循环再生粗细骨料取代率呈直线下降关系；两种强度之间呈指数函数关系；以短期强度性能考核，循环再生粗细骨料分别达到GB/T 25177—2010《混凝土用再生粗骨料》II类与GB/T 25176—2010《混凝土和砂浆用再生细骨料》III类标准要求，在循环再生粗细骨料单独与同时取代天然粗细骨料不超过70％与50％条件下用于制备C30结构混凝土是可行的。
위료탐토폐기재생혼응토작골료제비결구혼응토적가행성，종강도성능입수，수선용가속탄화시험제비료상당우재보호층혼응토탄화인기강근수식적일반배경하선후사용료2개50년적순배재생혼응토골료，연후시험분석료순배재생혼응토강도여순배재생골료취대방식급취대솔지간적관계。결과표명：부용순배재생조골료취대천연조골료적순배재생혼응토립방체항압강도화벽렬항랍강도여순배재생조골료취대솔균정삼차포물선관계，단괴점（최우여최불리취대솔）여합리취대구간불일치；부용순배재생세골료취대천연세골료급순배재생조세골료동시취대천연골료조건하，강도여순배재생세골료취대솔、순배재생조세골료취대솔정직선하강관계；량충강도지간정지수함수관계；이단기강도성능고핵，순배재생조세골료분별체도GB/T 25177—2010《혼응토용재생조골료》II류여GB/T 25176—2010《혼응토화사장용재생세골료》III류표준요구，재순배재생조세골료단독여동시취대천연조세골료불초과70％여50％조건하용우제비C30결구혼응토시가행적。
The strength properties of recycled aggregate concrete( RAC)using aggregates from repeatedly recycling concrete waste were studied. The relationships between cube compressive strength and splitting tensile strength and between each strength and replacement ra-tio of recycled aggregate to natural aggregate were established. The results show that the strength properties of RAC with the design strength of 30MPa can be satisfied when the quality of recycled coarse and fine aggregates met respectively the needs of Grade II in GB/T 25177—2010 and Grade III in GB/T 25176—2010,with the replacement ratio to natural coarse aggregate and natural fine aggre-gate no more than 70%and 50%. Both strengths decreased and then increas for a while before descending again with increasing replace-ment ratio of recycled coarse aggregate,and decreas continuously with the increase of replacement ratio of recycled fine aggregate. The relationship between cube compressive strength and splitting tensile strength of RAC is found to be exponential function.