CAJ | 학술논문

采用再生粗骨料取代天然粗骨料(取代率z =0，50%，100%)，研究再生粗骨料品质和取代率对再生混凝土收缩性能的影响。结果显示：简单破碎再生粗骨料混凝土的收缩率随着z 的增大而增大，与普通混凝土相比，60 d收缩率增大14.8%～55.8%，即收缩性能劣于普通混凝土；一次颗粒整形再生粗骨料混凝土的收缩率随着z 的增大变化很小，其收缩性能与普通混凝土接近；二次颗粒整形再生粗骨料混凝土的收缩率随着z 的增大而减小，与普通混凝土相比，60 d 收缩率减小了2.8%～14.6%，即收缩性能优于普通混凝土。
채용재생조골료취대천연조골료(취대솔z =0，50%，100%)，연구재생조골료품질화취대솔대재생혼응토수축성능적영향。결과현시：간단파쇄재생조골료혼응토적수축솔수착z 적증대이증대，여보통혼응토상비，60 d수축솔증대14.8%～55.8%，즉수축성능렬우보통혼응토；일차과립정형재생조골료혼응토적수축솔수착z 적증대변화흔소，기수축성능여보통혼응토접근；이차과립정형재생조골료혼응토적수축솔수착z 적증대이감소，여보통혼응토상비，60 d 수축솔감소료2.8%～14.6%，즉수축성능우우보통혼응토。
T he paper takes recycled coarse aggregate ( rather than natural aggregate,w ith the substitution rate z stands at 0,50% and 100%) as the study object and looks into the influence of its quality and substitution rate to the shrinkage performance of regenerating concrete. T he results indicate that the shrinkage rate for concrete of merely crushed aggregate goes up with the increase of z. T he shrinkage performance delivered fails to outshine that of ordinary concrete,as the rate for a 60 d period varies w ithin a range of 14. 8% ~55. 8%. In regard to concrete of re-profiled primary particle,the shrinkage rate shows only slight changes asz goes up,in other word its performance comes closer to that of the ordinary concrete. By contrast,concrete of re-profiled secondary particle displays a decline in shrinkage rate with the increase of z,meaning that the sample outperforms the ordinary sample in comparison. W ithin a period of 60 d,the shrinkage rate drops by a margin of 2. 8% ~14. 6%.