HPMC及硼砂对新型防漏高强注浆料性能及微观结构的影响

摘要/Abstract

摘要： 与传统注浆料相比,防漏高强注浆料具有防漏和高强两大特性,但其过快的凝结速度严重影响施工质量。为了解决凝结速度过快以及泌水问题,研究了羟丙基甲基纤维素(HPMC)和硼砂对防漏高强注浆料凝结温度、凝结时间、保水率、抗折强度和抗压强度的影响。结果表明:当HPMC掺量在0.20%~0.30%(以下掺量均为质量分数)时,硼砂掺量的增加会导致最高凝结温度上升以及恒温时间缩短;掺入HPMC不仅可以提高浆料的保水率,且对注浆料具有一定的缓凝效果,与硼砂同时使用时能增强注浆料的缓凝效果;随着硼砂掺量的增加,浆液结石体的抗折强度和抗压强度呈先增大后减小的变化趋势, HPMC可以减弱硼砂对浆液结石体强度的影响,但是,随着HPMC掺量的增加,浆液结石体强度逐渐降低。当硼砂掺量为0.07%、HPMC掺量为0.25%时,防漏高强注浆料能够在保证良好力学性能条件下获得更好的工作性能,此时,初凝时间达到1 h以上,3 d抗压强度达到36.58 MPa。增加HPMC掺量会导致钙矾石(AFt)晶体由柱状向针状转变,片状单硫型水化硫铝酸钙(AFm)逐渐减少,使结构松散,硼砂掺量为0.07%、HPMC掺量为0.25%时,AFt晶体呈柱状且分布均匀,相互之间具有较多的搭接点,结构更为致密。

关键词: 硼砂, 羟丙基甲基纤维素, 防漏高强注浆料, 凝结时间, 保水率, 抗压强度, 微观测试

Abstract: Compared with traditional grouting materials, leak-proof and high-strength grouting material has two characteristics of leak-proof and high-strength, but the setting speed is too fast, which seriously affects the construction quality. In order to solve the problems of too fast setting speed and bleeding, the effects of hydroxypropyl methyl cellulose (HPMC) and borax on the setting temperature, setting time, water retention rate and flexural strength and compressive strength of leak-proof and high-strength grouting material were studied. The results show that when the HPMC content is between0.20%～0.30% (the following content are all mass fraction), increasing of the borax content will increase the maximum setting temperature and shorten the constant temperature period time.The addition of HPMC not only improves the water retention rate of the slurry, but also has a certain retarding effect on the grouting material, and the retarding effect of the grouting material is enhanced when it is used together with borax. With the increase of the borax content, the flexural strength and compressive strength of the grouting concretion body increase first and then decrease. HPMC weakens the influence of borax on strength of the grouting concretion body. However, with the increase of HPMC content, the strength of grouting concretion body gradually decreases. When borax content is 0.07% and HPMC content is 0.25%, the leak-proof and high-strength grouting material obtains better working performance under the condition of ensuring good mechanical properties. At the same time, the initial setting time reaches more than 1 h, and the 3 d strength reaches 36.58 MPa. It is found that increasing of HPMC content leads to the transformation of vanadite (AFt) crystal from columnar to acicular, and the flaky mono-sulfur calcium sulphoaluminate hydrate (AFm) gradually decreases, making the structure loose. When borax content is 0.07% and HPMC content is 0.25%, AFt crystal is columnar and evenly distributed, which makes more overlapping points between them, and the structure more compact.

Key words: borax, HPMC, leak-proof and high-strength grouting material, setting time, water retention rate, compressive strength, microscopic test

中图分类号:

TU528

陈新明, 张浩文, 焦华喆, 杨柳华, 荣阳阳. HPMC及硼砂对新型防漏高强注浆料性能及微观结构的影响[J]. 硅酸盐通报, 2023, 42(3): 861-870.

CHEN Xinming, ZHANG Haowen, JIAO Huazhe, YANG Liuhua, RONG Yangyang. Effects of HPMC and Borax on Properties and Microstructure of New Leak-Proof and High-Strength Grouting Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 861-870.

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