Characterization, pretreatment, and valorization of wood biomass fly ash in a binary cement-free binder

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2025-06-27 DOI:10.1016/j.dibe.2025.100700

Xuhui Liang , Hua Dong , Zhenming Li , Chen Liu , Shizhe Zhang , Guang Ye

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引用次数: 0

Abstract

This research investigated the use of wood biomass fly ash (WBFA) as a key component in developing low-carbon cementitious materials. WBFA was first subjected to water pretreatment and grinding to remove metallic aluminum and free lime, reducing expansion and cracking risks. Characterization of WBFA showed its high calcium and alkali-bearing phases but limited aluminosilicates. Dissolution test showed WBFA had strong alkalinity, suggesting its role as an activator for aluminosilicate-bearing minerals. A novel cement- and chemical-free binary binder was developed using 50 % treated WBFA and 50 % blast furnace slag (BFS). Paste with a water-to-binder ratio of 0.4 achieved 40 MPa compressive strength at 60 days. The use of superplasticizer significantly improved flowability, allowing the water-to-binder ratio to be reduced to 0.25, which resulted in compressive strength up to 58 MPa at 60 days. Calcium aluminate silicate hydrates (C-A-S-H) gels and ettringite were identified as the main reaction products in the pastes.

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木材生物质粉煤灰在二元无水泥粘结剂中的表征、预处理和增值

研究了利用木材生物质粉煤灰作为低碳胶凝材料的关键成分。WBFA首先进行水预处理和研磨，去除金属铝和游离石灰，降低膨胀和开裂风险。表征结果表明，WBFA具有高钙相和高碱相，但铝硅酸盐含量有限。溶解试验表明，白硼酸钠具有较强的碱性，是铝硅酸盐矿物的活化剂。以50%处理过的白白fa和50%高炉矿渣为原料，研制了一种新型的无水泥、无化学物质二元粘结剂。水胶比为0.4的膏体60天抗压强度达到40 MPa。高效减水剂的使用显著改善了流动性，使水胶比降至0.25，在60天内抗压强度达到58 MPa。浆料的主要反应产物为铝酸钙硅酸盐水合物（C-A-S-H）凝胶和钙矾石。

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.