橡胶颗粒对再生混凝土耐久性影响

Influence of rubber particles on durability of recycled coarse aggregate concrete

摘要:

为研究橡胶颗粒粒径和掺量对再生混凝土耐久性的影响,针对水灰比为0.50再生混凝土设计了橡胶粒径60目、1～3 mm和3～6 mm与掺量10、20、30 kg／m³的6组混凝土配合比,对再生混凝土进行了抗压强度、抗氯离子渗透和抗冻性试验．结果表明:掺入橡胶颗粒降低了再生混凝土的抗压强度,再生混凝土的抗压强度随着橡胶颗粒掺量和粒径的增加而减小;橡胶颗粒的掺入能改善再生混凝土的抗氯离子渗透性能和抗冻性能,再生混凝土的抗氯离子渗透和抗冻性随着橡胶颗粒掺量增大和粒径的减小而提高,当橡胶颗粒的粒径为60目、掺量为30 kg／m³时,再生混凝土的耐久性能最好．

Abstract:

The influence of rubber particles on recycled aggregate concrete durability was studied in this paper. Compressive strength, permeability, and frost resistance were carried out to investigate the effect of rubber particles with different size of 60 mesh, 1-3 mm and 3-6 mm and replacement content replacing fine aggregate of 10 kg／m³,0 kg／m³ and 30 kg／m³ on recycled aggregate concrete. The results show that the compressive strength of recycled aggregate concrete is reduced with the addition of rubber particle, and the compressive strength is decreased with the addition of particles replacement content and particles size. The permeability and frost resistance of recycled aggregate concrete is improved by the addition of rubber particle and is raised with the increase of particles replacement content and decrease of particles size, and the recycled aggregate concrete expressed the best durability performance with rubber particles of 60 mesh and replacement content of 30 kg／m³.