纳米SiO2改性再生砂浆性能研究
Study on properties of nano-SiO2 modified recycled mortar
赵玉厦 1王玲玲1
作者信息
- 1. 沈阳建筑大学 材料科学与工程学院,沈阳 110168
- 折叠
摘要
采用水泥净浆、纳米SiO2、水泥净浆和纳米SiO2三种强化工艺对再生骨料进行处理,并对比分析.结果表明,纳米SiO2强化后的再生骨料吸水率为2.4%,压碎指标为4%.当再生骨料替代率为40%时,纳米SiO2强化后的再生砂浆7d抗折强度达到26.72MPa,28d抗折强度达到34.04MPa;7d抗压强度达到57.55MPa,28d抗压强度达到68.46MPa;冻融循环50次时质量损失率下降,相对动弹性模量提高,抗冻性能明显改善.
Abstract
Three reinforcement processes,cement slurry,nano-SiO2,and a combination of cement slurry and nano-SiO2,are used to treat recycled aggregates,and comparative analysis is conducted.The results show that the water absorption rate of the recycled aggregates reinforced with nano-SiO2 is 2.4%,and the crushing index is 4%.When the replacement rate of recycled aggregates is 40%,the 7-day flexural strength of the recycled mortar reinforced with nano-SiO2 reaches 26.72MPa,the 28-day flexural strength reaches 34.04MPa,and the 7-day compressive strength reaches 57.55MPa,the 28-day compressive strength reaches 68.46MPa.After 50 freeze-thaw cycles,the mass loss rate of the recycled mortar reinforced with nano-SiO2 decreases,its relative dynamic elastic modulus increases,and the frost resistance performance is significantly improved.
关键词
再生砂浆/纳米SiO2/抗折强度/抗压强度/抗冻性Key words
recycled mortar/nano-SiO2/flexural strength/compressive strength/frost resistance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据