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木质生物质飞灰与F类飞灰作为砂浆中辅助胶凝材料的对比分析

Comparative Analysis of Woody Biomass Fly Ash and Class F Fly Ash as Supplementary Cementitious Materials in Mortar.

作者信息

Yang Yaru, Takasu Koji, Suyama Hiroki, Ji Xiangnan, Xu Murong, Liu Zihao

机构信息

Architecture Course, Graduate School of Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino Wakamatsu, Kitakyushu 808-0135, Fukuoka, Japan.

Department of Architecture, Faculty of Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino Wakamatsu, Kitakyushu 808-0135, Fukuoka, Japan.

出版信息

Materials (Basel). 2024 Jul 27;17(15):3723. doi: 10.3390/ma17153723.

DOI:10.3390/ma17153723
PMID:39124386
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11312832/
Abstract

Biomass fly ash is a sustainable, eco-friendly cement substitute with economic and performance benefits, being renewable compared to coal fly ash. This study examines using biomass fly ash (BFA) as a sustainable cement substitute, comparing it with Class F fly ash (CFA). With a water-binder ratio of 0.5 and replacement rates of 10%, 15%, 20%, 25%, and 30% (by mass), the research highlights BFA's promising applications. BFA and CFA were mixed into cement paste/mortar to analyze their reactivity and properties, with hydration products CH and C-S-H evaluated at 7, 28, and 91 days. Compressive strength, micro-pore structure, and drying shrinkage (assessed from 7 to 182 days) were tested. Results showed BFA had similar pozzolanic reactions to CFA at later stages. While compressive strength decreased with higher BFA replacement rates, early-stage performance matched CFA; growth was CFA-10 (18 MPa) and BFA-10 (17.6 MPa). BFA mortars exhibited slightly better deformation properties. BFA-30 cement had superior performance, with a lower drying shrinkage rate of 65.7% from 14 to 56 days compared to CFA-10's 73.4% and a more stable shrinkage growth rate decrease to 8.4% versus CFA-10's 6.4% after 56 days. This study concluded that BFA, usable without preprocessing, performed best at a 10-15% replacement rate.

摘要

生物质粉煤灰是一种可持续、环保的水泥替代品，具有经济和性能优势，与煤粉煤灰相比具有可再生性。本研究考察了使用生物质粉煤灰（BFA）作为可持续水泥替代品，并将其与F类粉煤灰（CFA）进行比较。在水胶比为0.5且替代率为10%、15%、20%、25%和30%（质量分数）的情况下，该研究突出了BFA的应用前景。将BFA和CFA掺入水泥浆体/砂浆中，分析它们的反应活性和性能，并在7天、28天和91天评估水化产物CH和C-S-H。测试了抗压强度、微孔结构和干燥收缩（从7天到182天进行评估）。结果表明，BFA在后期具有与CFA相似的火山灰反应。虽然随着BFA替代率的提高抗压强度降低，但早期性能与CFA相当；强度增长情况为CFA-10（18MPa）和BFA-10（17.6MPa）。BFA砂浆表现出稍好的变形性能。BFA-30水泥具有优异的性能，与CFA-10在14至56天73.4%的干燥收缩率相比，其干燥收缩率为65.7%，且在56天后收缩增长率更稳定地降至8.4%，而CFA-10为6.4%。本研究得出结论，无需预处理即可使用的BFA在替代率为10-15%时性能最佳。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7bc2/11312832/d328e6ef7770/materials-17-03723-g010.jpg
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