| 摘要: |
| 研究了不同种类及掺量的膨胀剂对水泥基灌浆料早期收缩、流动度、硬化后强度等性能的影响.结果表明：硫铝酸盐膨胀剂掺入后，水泥基灌浆料后期膨胀效果较好，但其早期膨胀效果不理想；氧化钙膨胀剂掺入后，水泥基灌浆料早期与后期膨胀效果均较好，但对其流动度与强度有明显不利的影响；塑性膨胀剂能够显著提高浆体塑性阶段的竖向膨胀率，但对水泥基灌浆料早期强度影响较大；在掺有塑性膨胀剂的水泥基灌浆料中掺入消泡剂，在保证膨胀性的前提下，可有效细化水泥基灌浆料的孔隙，改善其孔隙结构，同时对其强度提升作用明显，具有较好的综合技术效果. |
| 关键词: 灌浆料 收缩 膨胀剂 消泡剂 |
| DOI：10.3969/j.issn.1007-9629.2022.03.013 |
| 分类号:TU528.44 |
| 基金项目:陕西省重点研发计划（2020SF-360） |
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| Effect of Different Expanders on Properties of Cement Based Grouting Material |
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LIU Yunxiao, CHI Yinyin, TIAN Wei, HOU Yingjie, ZHANG Jiahang
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School of Civil Engineering， Chang′an University， Xi′an 710061， China
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| Abstract: |
| The effects of different types and dosages of expanders on the early shrinkage， fluidity， and strength after hardening of cement based grouting material were studied. The results show that after adding sulphoaluminate expander， the late expansion effect of cement based grouting material is better， but its early expansion effect is not ideal. After the calcium oxide expander is incorporated， both early and late expansion effects are improved， but it has adverse effects on its fluidity and strength. Plastic expander can significantly increase the vertical expansion rate of slurry in the plastic stage， but has a great influence on the early strength of cement based grouting material. Adding defoaming agent into the cement based grouting material with the plastic expander can effectively reduce the size of air bubbles and improve its pore structure on the premise of ensuring the expansibility，and it also has a great effect on improving the strength and achieving a better comprehensive technical effect. |
| Key words: grouting material shrinkage expander defoaming agent |
