低钙粉煤灰-水泥浆液可注性试验研究

摘要/Abstract

摘要： 为了探究低钙粉煤灰在注浆法中的应用,本文以加固低强度破碎顶板为工程背景,进行了相应的室内试验,探究在不同水固比和粉煤灰掺量的影响因素下,浆液析水率、结石率、粘度、凝结时间以及注浆结石体强度的变化规律,并结合扫描电镜(SEM)以及X-射线衍射(XRD)等分析注浆体的微观结构。结果表明,当浆液的水固比为0.7:1(质量比)、粉煤灰掺量为70%(质量分数)时,浆液的性能参数最优。此时,浆液的粘度为55.50 s,析水率为3.89%(体积分数),结石率为94.16%(体积分数),3 d、7 d和28 d三个龄期浆液结石体的抗压强度分别为0.67 MPa,1.77 MPa和3.10 MPa。XRD定性物相分析表明,碱性激发剂的加入使体系中Ca(OH)₂衍射峰增高,随着期龄的增加,Ca(OH)₂、石英和莫来石相衍射峰明显减小,促进了粉煤灰潜在活性的释放。SEM微观结构形貌分析可知,早期浆体微观结构疏松,存在薄板状的Ca(OH)₂,并伴有少量针状的AFt(钙矾石),后期浆体内部的薄板状晶体Ca(OH)₂和絮凝状C-S-H凝胶交织在一起,形成密实的网络结构。

关键词: 粉煤灰-水泥浆液, 注浆材料, 可注性, 水化产物, 微观机理

Abstract: In order to explore the application of low calcium fly ash in the grouting method, based on the engineering background of strengthening low strength broken roof, the corresponding laboratory tests were carried out. The variation law of bleeding rate, concretion rate, viscosity, setting time, and grouting stone body strength of slurry were investigated under the influence of different water-solid ratios and fly ash content. The microstructure of the grouting body was analyzed by the scanning electron microscope (SEM) and the X-ray diffraction (XRD). The results show that when the water-solid ratio of the slurry is 0.7:1 (mass ratio) and fly ash content is 70% (mass fraction), the performance parameters of the slurry are optimal. At this time, the viscosity of the slurry is 55.50 s, the bleeding rate is 3.89% (volume fraction), and the concretion rate is 94.16% (volume fraction). The compressive strength of the slurry stone at three curing age stages of 3 d, 7 d, and 28 d are 0.67 MPa, 1.77 MPa, and 3.10 MPa, respectively. XRD qualitative phase analysis shows that the addition of alkaline activator increases the diffraction peak of Ca(OH)₂ in the system. And with the increase of curing age, the diffraction peak of Ca(OH)₂, quartz, and mullite phase decrease significantly, which promote the release of the potential activity of fly ash. SEM microstructure and morphology analysis reveal that the microstructure of slurry is loose in the early stage, with thin-plate crystal Ca(OH)₂ and a small amount of acicular AFt (ettringite). At the later stage, the thin-plate crystal Ca(OH)₂ and the flocculated C-S-H gel intertwine together to form a dense network structure.

Key words: fly ash-cement slurry, grouting material, groutability, hydration product, micro mechanism

中图分类号:

TQ502

周盛全, 陈伟, 李剑伟, 李栋伟. 低钙粉煤灰-水泥浆液可注性试验研究[J]. 硅酸盐通报, 2021, 40(5): 1554-1563.

ZHOU Shengquan, CHEN Wei, LI Jianwei, LI Dongwei. Experimental Study on Groutability of Low Calcium Fly Ash-Cement Slurry[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1554-1563.

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