大掺量粉煤灰注浆充填材料试验研究  

Experimental research on grouting material with large volume fly ash

作　　者：童立元[1] 潘石[1] 邱钰[1] 宣国良[1] 刘松玉[1] 

机构地区：[1]东南大学交通学院,南京210096

出　　处：《东南大学学报（自然科学版）》2002年第4期643-647,共5页Journal of Southeast University：Natural Science Edition

摘　　要：为了解大掺量粉煤灰的水泥粉煤灰注浆材料的物理力学性能 ,通过室内试验 ,探讨了在大掺量粉煤灰情况下 ,不同水灰质量比、固相质量比及不同外加剂用量与硬化体抗压强度、浆体凝结时间、流动度、粘度、结石率之间的相互关系 .试验表明 ,随粉煤灰掺量的增加 ,硬化体抗压强度、浆体流动度降低 ,而凝结时间延长 ,结石率和粘度增大 ;硬化体早期强度较低 ,后期强度有较大增长 ( 1 2 0d后仍有所增长 ) ;适量水玻璃的掺入 (水玻璃占水泥质量分数不大于 3% )使凝结时间缩短 ,结石率增大 ,但导致硬化体抗压强度降低 ,浆体流动性变差 ;浆体凝结时间较长 ,水灰质量比 ( 0 .7～ 1 .0 )∶1 .0 ,粉煤灰掺量质量分数为 60 %～ 90 %时 ,初凝一般大于 1 2h ,终凝一般大于2 0h .Experiments on cement and fly ash grouting material with large volume fly ash were carried out in laboratory in order to understand the correlation between different water cement ratio, solid phase proportion, additive proportion and setting time, viscidity, fluidity, hardening rate, and concretion strength. The results show that with the increase of fly ash proportion the concretion strength and serum fluidity decrease, while setting time, hardening rate and viscidity increase. The early strength of concretion is low while the late strength increases remarkable even after 120 d. With soluble glass mixed(≤3%), setting time decreases and hardening rate increases,but at the same time the concretion strength and fluidity decrease. The setting time is quite long, when the water cement ratio is (0.7-1.0)∶1 and the proportion of fly ash is 60%-90%, the early setting time is longer than 12 hours and the last setting time is longer than 20 hours.

关 键 词：注浆充填材料 试验研究 大掺量粉煤灰 注浆充填法 水灰质量比 固相质量比 采空区 高速公路 

分 类 号：U414.03[交通运输工程—道路与铁道工程] U412.366