快硬微膨胀高强锚杆注浆材料的研制  

Development of Rapid-hardening,Expansive,High-strength Grouting Mortar

作　　者：戴银所[1,2] 谭跃虎[1] 杨庆恒[1] 王在晖[1] 丁建党[1] 谢江南[1] 

机构地区：[1]解放军理工大学国防工程学院,南京210007 [2]南京工业大学材料化学工程国家重点实验室,南京210009

出　　处：《土木建筑与环境工程》2013年第4期128-132,共5页Journal of Civil,Architectural & Environment Engineering

基　　金：南京工业大学材料化学工程国家重点实验室开放课题(KL10-07);江苏省高校省级重点实验室开放研究课题(Wjjqfhcl200802);军队防护工程科研项目(KYGYZXJK0904、KYFYZXJK1207)

摘　　要：为了解决传统锚固材料早期强度低、体积收缩等问题,开发具有快硬、微膨胀、高强的锚固材料对满足锚杆支护快速施工具有重要的价值。以铝酸盐和硫酸盐生成钙矾石的反应具有快速和膨胀的特点为理论依据,选用明矾石、石膏对注浆材料进行改性研究。结果表明:注浆材料具有早期膨胀迅速、后期膨胀稳定的特点,硬化时间能控制在0.5～1.5h时之间,1、3d强度分别达到20、40MPa;微观测试发现随养护时间的增加硬化浆体中生成了大量钙矾石,孔隙率逐渐降低。通过锚杆拉拔试验发现其1m长砂浆锚固体14d极限抗拔力达到93kN,超过1.5～2m砂浆锚固体极限抗拔力的平均水平。In order to solve the problem that the cement-based anchoring material has low early-strength and its volume contracts obviously,it is necessary to develop anchoring material which has characteristics of early-strength,expansion,high strength etc.Based on the ettringite with characteristic of early strong and expansion,the properties of the grouting mortars modified with alunite and gypsum were studied.The results show that at early stage the expansion is rapid and expansion is stabilized at later stage.The setting time can be controlled in 0.5～1.5 hours,and compressive strength of 1 day and 3 days reaches 20 and 40Mpa,respectively.The micro-analysis shows that with the increase of curing-time there are plenty of expansive ettringite crystals and porosity decreases.The limit load test shows that the pullout force of 1metre sample at 14 days is 93 KN,which is larger than the average lever of 1.5～2 meters samples.

关 键 词：锚杆 锚固材料 明矾石 钙矾石 早强 微膨胀 

分 类 号：TU525.9[建筑科学—建筑技术科学] TU751