摘要
为探究废塑料纤维增强聚苯乙烯轻质混凝土的干缩性能,通过制备不同聚苯乙烯掺量和废塑料纤维掺量的轻质混凝土,对试件干缩变形进行实时监测记录,分析废塑料纤维掺量和聚苯乙烯颗粒掺量对干缩变形的影响。结果表明:聚苯乙烯的掺入可提高混凝土的初始坍落度,并延缓其随时间下降的速度,而废塑料纤维则会降低混凝土的坍落度;随着干燥龄期的增加,聚苯乙烯使混凝土收缩应变增长迅速,10%掺量的聚苯乙烯可以降低干燥收缩,其余掺量会增加混凝土的干燥收缩;废塑料纤维可以抑制混凝土的干燥收缩,1.00%~1.50%掺量的废塑料纤维抵抗混凝土干燥的能力较强。聚苯乙烯可提高初始流动性,但高掺量会导致干燥收缩应变增大;废塑料纤维能控制收缩,但会降低流动性。实际工程中需在流动性和收缩控制之间进行权衡。
To explore the dry shrinkage performance of waste plastic fiber-reinforced polystyrene lightweight concrete,lightweight concrete with different dosages of polystyrene and waste plastic fibers was prepared.The dry shrinkage deformation of the specimens was monitored and recorded in real time,and the effects of the dosages of waste plastic fibers and polystyrene particles on the dry shrinkage deformation were analyzed.The results show that the addition of polystyrene can increase the initial slump of concrete and slow down its rate of decline over time,while waste plastic fibers will reduce the slump of concrete.With the increase of the drying age,polystyrene causes the shrinkage strain of concrete to increase rapidly.A 10%dosage of polystyrene can reduce the drying shrinkage,while the remaining dosages will increase the drying shrinkage of concrete.Waste plastic fibers can inhibit the drying shrinkage of concrete.Waste plastic fibers with a dosage of 1.00%~1.50%have a stronger ability to resist the drying of concrete.Polystyrene can improve the initial fluidity,but a high dosage will lead to an increase in the drying shrinkage strain.Waste plastic fibers can control shrinkage,but they will reduce fluidity.In practical engineering,a trade-off needs to be made between fluidity and contraction control.
作者
陈腾龙
CHEN Tenglong(Bodi Construction Group Co.,Ltd.)
出处
《广东建材》
2025年第6期17-20,共4页
Guangdong Building Materials
关键词
废塑料纤维
聚苯乙烯颗粒
轻质混凝土
干缩性能
Waste plastic fiber
Polystyrene particles
Lightweight concrete
Dry shrinkage performance
