CAJ | 학술논문

通过改变再生粗骨料取代率，并考虑引气剂的影响，对再生混凝土长龄期下的立方体抗压强度和收缩性能进行试验；采用不同的加载龄期，对再生粗骨料取代率为50％的再生混凝土徐变性能进行试验研究；建立了再生混凝土长龄期强度推算公式。结果表明：长龄期下再生混凝土的立方体抗压强度变化规律与普通混凝土基本一致，28 d龄期再生混凝土的立方体抗压强度随再生粗骨料取代率的增加而降低；再生混凝土的收缩随再生粗骨料取代率的增加而增加，添加粉煤灰、矿粉等矿物外掺料可以使再生混凝土收缩降低；加载龄期对于再生混凝土徐变值有影响，加载龄期越早，再生混凝土徐变值越大；利用所建立的强度推算公式计算得到的强度值与试验结果比较吻合，并且优于欧洲CEB‐FIP M odel Code 1990规范建议公式的计算结果。
통과개변재생조골료취대솔，병고필인기제적영향，대재생혼응토장령기하적립방체항압강도화수축성능진행시험；채용불동적가재령기，대재생조골료취대솔위50％적재생혼응토서변성능진행시험연구；건립료재생혼응토장령기강도추산공식。결과표명：장령기하재생혼응토적립방체항압강도변화규률여보통혼응토기본일치，28 d령기재생혼응토적립방체항압강도수재생조골료취대솔적증가이강저；재생혼응토적수축수재생조골료취대솔적증가이증가，첨가분매회、광분등광물외참료가이사재생혼응토수축강저；가재령기대우재생혼응토서변치유영향，가재령기월조，재생혼응토서변치월대；이용소건립적강도추산공식계산득도적강도치여시험결과비교문합，병차우우구주CEB‐FIP M odel Code 1990규범건의공식적계산결과。
The effects of the recycled coarse aggregate(RCA)replacement ratio and air‐entraining agent on cube compressive strength and shrinkage of recycled aggregate concrete(RAC) were experimentally investigated .The creep of RAC with 50% RCA replacement ratio was also studied by varying the loading time .Meanwhile ,the calculation formula for the compressive strength of RAC at various ages was established .The experimental results reveal that the long‐term strength increasing rule of RAC is similar to that of natural aggregate concrete .The cube compressive strength of RAC at 28 d reduces whereas the shrinkage increases with the increase of RCA replacement ratio . In addition , adding reasonable amount of slag and fly ash can reduce the shrinkage of RAC .The loading time has an effect on the creep of RAC as the creep is greater when the specimens are loaded at an earlier age .The compressive strength values calculated by the proposed formula are in good agreement with the experiment results and more accurate than the outcomes deprived from the suggested formula in CEB‐FIP Model Code 1990 .