不同养护条件下掺循环流化床固硫灰硬化水泥浆的膨胀性能

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (12): 4332-4341.

所属专题：资源综合利用

不同养护条件下掺循环流化床固硫灰硬化水泥浆的膨胀性能

韩东霄, 阎蕊珍, 李倩, 赵盛林, 贾科瑞

太原理工大学土木工程学院,太原 030024

收稿日期:2022-07-07 修订日期:2022-08-22 出版日期:2022-12-15 发布日期:2023-01-11
通信作者: 阎蕊珍,博士,副教授。E-mail:yanruizhen2266@163.com
作者简介:韩东霄(1998—),男,硕士研究生。主要从事建筑固废利用的研究。E-mail:18814728180@163.com
基金资助:
山西省自然科学基金(20210302124674)

Expansion Performance of Hardened Cement Paste with Circulating Fluidized Bed Fly Ash under Different Curing Conditions

HAN Dongxiao, YAN Ruizhen, LI Qian, ZHAO Shenglin, JIA Kerui

College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Received:2022-07-07 Revised:2022-08-22 Online:2022-12-15 Published:2023-01-11

摘要/Abstract

摘要： 为探讨掺循环流化床固硫灰(简称固硫灰)硬化水泥浆的体积变化规律,将固硫灰以不同质量取代水泥制备水泥浆试件,结合扫描电子显微镜、压汞仪、X射线衍射仪及TG-DSC同步热分析仪分析了固硫灰及试件的微观形貌、矿物组成和热效应,对三种养护条件下试件的体积膨胀性能进行了试验研究。结果表明:固硫灰的掺入能显著提高浆体标稠用水量,固硫灰掺量80%(质量分数,下同)的浆体标稠用水量是基准组的1.6倍;封闭养护时,硬化浆体体积随固硫灰掺量的增加由收缩(掺量低于40%)变为膨胀(掺量高于60%),且收缩率高于基准组;相较于封闭养护,标准养护使硬化浆体内部水化更充分,大毛细孔含量减少,微观结构更密实,硬化浆体体积膨胀,固硫灰掺量80%的试件28 d膨胀率最高达0.42%;空气养护的试件体积均呈收缩趋势,80%固硫灰掺量的试件水灰比较大,但干燥引起的收缩变形高于膨胀产物产生的膨胀变形。

关键词: 循环流化床固硫灰, 钙矾石, 膨胀性能, 养护条件, 封闭养护, 标准养护

Abstract: To reveal the volume variation of hardened cement paste with circulating fluidized bed fly ash (CFBFA), CFBFA was employed to replace cement by mass to prepare the cement paste specimens. The volume expansion of the specimens were studied under different curing conditions. Meanwhile, the micro morphology, mineral composition and thermal effect of the CFBFA and paste specimens were analyzed by using scanning electron microscope (SEM), X-ray diffraction (XRD), mercury porosimeter and TG-DSC thermal analyzer. The results show that the water requirement for standard consistency of the blended paste significantly increases with the incorporation of the CFBFA due to the rough and porous surface of the particles. The water requirement for standard consistency of the blended paste with 80% (mass fraction, the same bellow) CFBFA content is 1.6 times as much as that of the neat cement paste. Moreover, the specimens with CFBFA content less than 40% exhibit shrinkage cured under the closed condition, specimens with over 60% CFBFA present remarkable expansion. The internal hydration of the specimens under the standard curing condition are sufficient, the specimens exhibit expansion which increased with CFBFA content under the standard curing condition. The expansion ratio of the specimens with 80% CFBFA content reaches 0.42% after 28 d. All the specimens presented drying shrinkage when they are exposed to the ambient air. However, the specimens with 80% CFBFA content gained more shrinkage over the expansion induced by the inclusion of CFBFA, which is attributed to the higher water to cement ratio.

Key words: circulating fluidized bed fly ash, ettringite, expansion performance, curing condition, closed curing condition, standard curing condition

中图分类号:

TU521.4

韩东霄, 阎蕊珍, 李倩, 赵盛林, 贾科瑞. 不同养护条件下掺循环流化床固硫灰硬化水泥浆的膨胀性能[J]. 硅酸盐通报, 2022, 41(12): 4332-4341.

HAN Dongxiao, YAN Ruizhen, LI Qian, ZHAO Shenglin, JIA Kerui. Expansion Performance of Hardened Cement Paste with Circulating Fluidized Bed Fly Ash under Different Curing Conditions[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(12): 4332-4341.

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不同养护条件下掺循环流化床固硫灰硬化水泥浆的膨胀性能

Expansion Performance of Hardened Cement Paste with Circulating Fluidized Bed Fly Ash under Different Curing Conditions

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