赤泥基胶凝材料的水化动力学过程及其水化机制研究  

Hydration kinetics and hydration mechanism of red mud-based cementitious materials

作　　者：崔雯雯 董晓强[1,2] 刘晓勇 赵睿阳 贺高乐 张蒙 周磊 武学文 CUI Wen-wen;DONG Xiao-qiang;LIU Xiao-yong;ZHAO Rui-yang;HE Gao-le;ZHANG Meng;ZHOU Lei;WU Xue-wen(College of Civil Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Shanxi Provincial Key Laboratory of Civil Engineering Disaster Prevention and Control,Taiyuan,Shanxi 030024,China;China Railway Urban Construction Group the 1st Engineering Corporation Limited,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学土木工程学院,山西太原030024 [2]山西省土木工程防灾与控制重点实验室,山西太原030024 [3]中铁城建集团第一工程有限公司,山西太原030024

出　　处：《岩土力学》2025年第3期867-880,共14页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.52378360,No.51978438);山西省研究生研究与创新项目(No.2023KY173);山西省科技创新人才团队专项资助。

摘　　要：随着工业的迅速发展,对传统混凝土原料的需求不断增加,促使研究者探索新的替代材料。赤泥等工业副产品被认为在节约资源、降低成本和减少环境影响方面具有一定潜力。然而这些固废材料在胶凝材料中的水化机制仍不明确。利用低场核磁共振和等温量热法对含赤泥、钢渣、粉煤灰和磷石膏的胶凝材料水化动力学进行了综合分析。研究表明,赤泥基胶凝材料的水化过程可分为结晶成核、相边界反应和扩散3个阶段,其中结晶成核阶段的反应速率最高。钢渣和磷石膏能加速水化反应,改善材料的孔隙结构,而粉煤灰虽反应较慢,但同样有助于最终促进孔隙结构的改善。统计结果显示,早期水化放热量与7 d抗压强度具有较强的相关性,可有效预测材料初期强度。With the rapid development of the engineering industry,the demand for traditional concrete materials has been steadily increasing,prompting researchers to explore new alternative materials.Industrial by-products such as red mud are believed to have potential in resource conservation,cost reduction,and mitigating environmental impact.However,the hydration mechanism of these solid waste materials in cementitious materials remain unclear.In this study,comprehensive analysis of the hydration kinetics of cementitious materials containing red mud,steel slag,fly ash,and phosphogypsum was conducted using low-field nuclear magnetic resonance and isothermal calorimetry.The study indicates that the hydration process of red mud-based cementitious materials can be divided into three stages:nucleation and crystallization,phase boundary reactions,and diffusion,with the reaction rate being highest during the nucleation and crystallization stage.Steel slag and phosphogypsum accelerate the hydration reaction and improve the material’s pore structure,while fly ash,although reacting more slowly,also contributes to the eventual improvement of the pore structure.Statistical results show that early hydration heat release is strongly correlated with the compressive strength at 7 days,which can effectively predict the material’s early strength.

关 键 词：赤泥 无侧限抗压强度 水化动力学 低场核磁共振 等温量热法 

分 类 号：TU411[建筑科学—岩土工程]