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建筑石膏与胶凝材料
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有机增稠剂对后张法预应力管道压浆料性能的影响

作者：史艳娜1，2，彭小芹2，王淑萍2，孙科科2，曾路2

关键字：有机,增稠剂,对,后,张法,预应力,管道,压,浆料,

　
（1.重庆建研科之杰新材料有限公司，重庆  402761；2.重庆大学 材料科学与工程学院，重庆  400045）
    摘要：压浆料的稳定性是影响压浆料施工性能，确保预应力结构安全性和耐久性的重要技术参数，主要研究了纤维素醚、淀粉醚和麦芽糊精3种有机增稠剂对压浆料浆体稳定性、流动度及凝结硬化性能的影响。结果表明：3种有机增稠剂均能提高浆体的稳定性，其中淀粉醚掺量为0.011%时，压浆料的初始、0.5 h和1.0 h流动度最佳，分别为15.1、15.9、16.7 s；当麦芽糊精掺量为0.15%时，压浆料终凝时间大于24 h；当淀粉醚掺量为0.009%时，压浆料的抗折、抗压强度最高，分别为13.8、71.3 MPa。综合考虑压浆料的各项性能，建议选用淀粉醚作为压浆料的有机增稠剂，最佳掺量为0.009%~0.013%。
    关键词：压浆料；有机增稠剂；稳定性；流动度；凝结时间；力学性能
    中图分类号：TU57+8.1        文献标识码：A        文章编号：1001-702X（2019）09-0048-05
 
Influence of organic viscosity-enhancing admixtures on post-tensioned pre-stress duct grouting material
SHI Yanna1，2，PENG Xiaoqin2，WANG Shuping2，SUN Keke2，ZENG Lu2
（1.Chongqing Jianyan Kezhijie New Material Co. Ltd.，Chongqing 402761，China；
2.College of Material Science and Engineering，Chongqing University，Chongqing 400045，China）
    Abstract：The stability of the duct grouts is an important technical parameter that affects the performance of the duct grouts and ensures the safety and durability of the pre-stress structure. In this paper，the effects of three organic viscosity-enhancing admixtures，cellulose ether，starch ether and maltodextrin，on the stability，fluidity and setting and hardening of the duct grouts were studied. The results showed that three organic viscosity-enhancing admixtures improve the stability of the duct grouts，when the content of starch ether was 0.011%，the fluidity of the initial duct grouts，0.5 h and 1.0 h was the best，which were 15.1 s，15.9 s and 16.7 s respectively，when maltodextrin content is 0.15%，the final setting time of the duct grouts exceeds the standard requirement of 24 h. When the starch ether content is 0.009%，the flexural and compressive strength values of the duct grouts are the largest，respectively 13.8 MPa，71.3 MPa. Considering，it is found that starch ether is more suitable as a viscosity-enhancing admixtures for duct grouts，and the optimum dosage is 0.009%~0.013%.
    Key words：duct grouts，organic viscosity-enhancing admixtures，stability，fluidity，setting time，mechanical property