长江科学院院报 ›› 2016, Vol. 33 ›› Issue (9): 143-148.DOI: 10.11988/ckyyb.20150501

• 水工结构与材料 • 上一篇    下一篇

水灰比和偏高岭土掺量对硫铝酸盐水泥基材料性能的影响

何凯1,严绍军1,赵莽1,窦彦1,翟国林2   

  1. 1.中国地质大学武汉 工程学院,武汉 430074;
    2.广州市地下铁道总公司,广州 510000
  • 收稿日期:2015-06-15 修回日期:2015-08-14 出版日期:2016-09-25 发布日期:2016-09-22
  • 通讯作者: 严绍军(1973-),男,四川绵竹人,副教授,博士,主要从事岩土文物保护和地质工程等方面的研究, (电话)18971675062(电子信箱)Shaojuncug@qq.com。
  • 作者简介:何 凯(1991-),男,湖北武汉人,硕士研究生,主要从事地质工程和岩土文物保护工作研究,(电话)18140533542(电子信箱)18140533542@163.com。
  • 基金资助:
    国家文物局项目(40972183)

Effects of Water-cement Ratio and Metakaolin Blending Ratio on the Performance of Sulphoaluminate Cement-based Material

HE Kai1,YAN Shao-jun1,ZHAO Mang1,DOU Yan1,ZHAI Guo-lin2   

  1. 1.Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;
    2.Guangzhou Metro Corporation,Guangzhou 510000,China
  • Received:2015-06-15 Revised:2015-08-14 Online:2016-09-25 Published:2016-09-22

摘要: 为了研究水灰比和偏高岭土掺量对硫酸铝盐水泥的流动度、收缩率和力学性能的影响,以龙门石窟裂隙防渗的灌浆工程为例,开展流动性试验、力学性能试验及干缩性能试验。结果表明硫铝酸盐水泥初始流动度大小与水灰比、偏高岭土掺量均成正比;水灰比越高,微膨胀率越低,甚至出现一定收缩,整体上膨胀率随偏高岭土掺量增大而变大;抗压强度大小与水灰比、偏高岭土掺量均成反比;7 d的抗折强度随偏高岭土掺量增大而减小,养护28 d的抗折强度恰恰相反;抗折强度随水灰比的增大而减小,且回落幅度相对较大;黏结强度随水灰比先增大后减小,随偏高岭土掺量增加,黏结强度整体上有所增加,在水灰比为0.5时,出现1个峰值。 试验结果可为龙门石窟的现场灌浆试验提供理论依据,也可为同类石质文物的灌浆修复研究提供参考。

关键词: 硫铝酸盐水泥, 水灰比, 偏高岭土掺量, 流动度, 力学性能

Abstract: To study the influences of water-cement ratio and metakaolin blending ratio on the fluidity, shrinkage and mechanical properties of sulphoaluminate cement, we take Longmen Grottoes as an example, and carry out tests on fluidity, mechanical properties and dry shrinkage property. The results show that, firstly, the initial fluidity of sulphoaluminate cement is proportional to water-cement ratio and metakaolin blending ratio; secondly, the higher water-cement ratio is, the lower microexpansion rate is, even with a little contraction. In general , expansion rate increases with metakaolin blending ratio; compressive strength is inversely proportional to water-cement ratio and metakaolin blending ratio; the flexural strength of specimens cured for 7 days decreases with the increasing metakaolin blending ratio, while the flexural strength of specimens cured for 28 days is on the contrary; flexural strength decreases with the increasing water-cement ratio, and the decline rate is relatively large; bonding strength increases first and then decreases with the increasing water-cement ratio; while with increasing metakaolin blending ratio, bonding strength increases overall, and in particular, peak value occurs under water-cement ratio of 0.5. The experimental results provide theoretical basis for the field grouting test in Longmen Grottoes, and also provide reference for grouting repair in similar stone cultural relics.

Key words: sulphoaluminate cement, water-cement ratio, metakaolin blending ratio, fluidity, mechanical properties

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