Ⅲ类再生骨料对C60混凝土性能影响的研究

Research on Performance of C60 Concrete Incorporating with Class Ⅲ Recycled Aggregate

将Ⅲ类再生骨料掺入C60混凝土中,研究其对混凝土性能(抗压强度、抗氯离子渗透性能、抗冻性能和抗收缩性能)的影响;同时掺入混凝土膨胀剂,研究其对混凝土性能改善效果。试验结果表明:Ⅲ类再生骨料替代率为15%时,对C60混凝土抗压强度、抗冻性能和抗氯离子渗透性能无明显影响;Ⅲ类再生骨料替代率为15%时,细骨料对C60混凝土抗收缩性能无不利影响,而粗骨料影响显著;C60混凝土掺入膨胀剂后,仅对抗收缩性能具有一定改善效果,对其他性能无改善作用。

In this paper,the performance（compressive strength,resistance of concrete to chloride penetration,resistance of concrete to freezing and thawing and resistance of concrete to shrinkage）of C60 concrete incorporating with class Ⅲ recycled aggregate would be studied;meanwhile,the improved performance of C60 recycled aggregate concrete incorporating with concrete expansive agent would be studied. The results indicated that there would be no effect on resistance of concrete to chloride penetration,resistance of concrete to freezing and thawing when class Ⅲ recycled aggregate replacement rate was 15%;there would be no effect on resistance of concrete to shrinkage when class Ⅲ recycled fine aggregate replacement rate was 15%;however,there would be some effect on resistance of concrete to shrinkage when class Ⅲ recycled coarse aggregate replacement rate was 15%;the method of incorporating with concrete expansive agent would only have improved resistance of C60 recycled aggregate concrete to shrinkage.