循环流化床灰蒸压加气混凝土中延迟形成钙矾石的研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (7): 2439-2446.

所属专题：资源综合利用

循环流化床灰蒸压加气混凝土中延迟形成钙矾石的研究

房天齐, 黄舒, 乔秀臣

华东理工大学资源与环境工程学院,上海 200030

收稿日期:2023-01-16 修订日期:2023-05-03 出版日期:2023-07-15 发布日期:2023-07-25
通信作者: 乔秀臣,博士,教授。E-mail: xiuchenqiao@ecust.edu.cn
作者简介:房天齐(1996—),男,硕士研究生。主要从事固废资源化利用的研究。E-mail: 2489813594@qq.com

Delayed Formation of Ettringite in Autoclaved Aerated Concrete with Circulating Fluidized Bed Fly Ash

FANG Tianqi, HUANG Shu, QIAO Xiuchen

School of Resources and Environment Engineering, East China University of Science and Technology, Shanghai 200030, China

Received:2023-01-16 Revised:2023-05-03 Online:2023-07-15 Published:2023-07-25

摘要/Abstract

摘要： 以循环流化床灰(CFBA)取代煤粉炉粉煤灰(PFA),研究不同CFBA取代量和水泥掺量对蒸压加气混凝土(AAC)抗压强度和干密度的影响,借助化学滴定、X射线衍射(XRD)和扫描电子显微镜(SEM)探究钙矾石(AFt)在AAC中延迟形成的特点。结果表明,CFBA取代40%(质量分数)PFA、水泥掺量为20.0%(质量分数)条件下,能够制备满足干密度级别B05和强度级别A3.5要求的AAC。当CFBA分别取代40% PFA、100% PFA后,未经蒸压处理的空气养护试样中AFt含量于7 d达到最大值,分别为7.71%(质量分数)和18.60%;经过蒸压制得AAC后,再空气养护28 d,试样中延迟生成的AFt量均少于1.00%;而蒸压处理制得AAC后,再泡水养护28 d,CFBA取代40% PFA的试样中AFt生成量为2.57%,CFBA取代100% PFA的试样中AFt生成量达4.46%;CFBA取代100% PFA的AAC试样中延迟形成的AFt为典型高长径比针棒状晶体,存在体积安定性风险。

关键词: 蒸压加气混凝土, 循环流化床, 钙矾石, 煤粉炉粉煤灰, 干密度, 抗压强度

Abstract: Circulating fluidized bed fly ash (CFBA) was used to replace pulverized fuel ash (PFA). The effects of different CFBA substitution amount and cement content on compressive strength and dry density of autoclaved aerated concrete (AAC) were studied. Then, chemical titration, X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to explore the characteristics of delayed formation of ettringite (AFt) in AAC. The results show that when CFBA replaces 40% (mass fraction) PFA and cement content is 20.0% (mass fraction), AAC meeting the requirements of dry density grade B05 and strength grade A3.5 is prepared. When CFBA replaces 40% PFA and 100% PFA, the AFt content in 7 d air cured sample without autoclaved treatment reaches the maximum value of 7.71% (mass fraction) and 18.60%, respectively. After AAC obtained by autoclaved treatment and then air curing for 28 d, the amount of AFt delayed in sample is less than 1.00%. After AAC prepared by autoclaved treatment, and then soaked in water for 28 d, the AFt production in sample with CFBA replacing 40% PFA is 2.57%, and the AFt production in sample with CFBA replacing 100% PFA is 4.46%. The delayed AFt formed in AAC sample with CFBA replacing 100% PFA is a typical needle-rod crystal with high aspect ratio, which has the risk of volume stability.

Key words: autoclaved aerated concrete, circulating fluidized bed, ettringite, pulverized fuel ash, dry density, compressive strength

中图分类号:

TU526

房天齐, 黄舒, 乔秀臣. 循环流化床灰蒸压加气混凝土中延迟形成钙矾石的研究[J]. 硅酸盐通报, 2023, 42(7): 2439-2446.

FANG Tianqi, HUANG Shu, QIAO Xiuchen. Delayed Formation of Ettringite in Autoclaved Aerated Concrete with Circulating Fluidized Bed Fly Ash[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2439-2446.

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循环流化床灰蒸压加气混凝土中延迟形成钙矾石的研究

Delayed Formation of Ettringite in Autoclaved Aerated Concrete with Circulating Fluidized Bed Fly Ash

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