MgO-SiO2水泥中的碳化和相位演变:对强度的影响
Gonzalo Mármol1, Ana Fernández-Jiménez1, María-Teresa Blanco-Varela1
1Eduardo Torroja Institute for Construction Science (IETcc-CSIC), Serrano Galvache, 4, 28033 Madrid, Spain.
Molecules (Basel, Switzerland)
|March 13, 2025
概括
早期碳化酸水合物 (M-S-H) 结合剂,使用和,影响相位演变和机械性能. 这一过程影响了MgO-SiO2水泥系统中的强度发展和矿物学.
科学领域:
- 材料科学 材料科学 材料科学
- 地质化学 地质化学
- 土木工程 土木工程是指土木工程.
背景情况:
- 酸水合物 (M-S-H) 结合剂具有潜力,但由于MgO溶解速度缓慢和水化动力学,由于早期的强度而扎.
- 了解碳化等环境因素的影响对于优化MgO-SiO2水泥系统至关重要.
研究的目的:
- 研究早期碳化对MgO-SiO2水泥系统的影响.
- 分析二氧化碳暴露对相位演变,M-S-H凝形成和机械性能的影响.
- 确定增强这些结合剂早期强度发展的策略.
主要方法:
- 在早期阶段,MgO-SiO2水泥系统暴露于CO2和的大气中.
- 使用X射线衍射 (XRD),热重力测量分析 (TGA),扫描电子显微镜与能量分散光谱学 (SEM-EDS) 和富里埃变换红外光谱学 (FTIR) 的表征.
- 评估机械强度的发展和阶段组成.
主要成果:
- 早期碳化促进了水合碳酸 (HMHC) 的形成,改变了水化途径.
- 增加的碳化水平与降低的氧化 (Mg(OH) 2) 稳定性和M-S-H凝含量相关.
- 观察到对矿物学和早期机械强度的重大影响,受配方和水与水泥比率的影响.
结论:
- 早期碳化显著影响MgO-SiO2水泥系统中的相位演变和机械性能.
- 由于碳化而形成HMHC阶段会影响Mg(OH) 2的稳定性和整体M-S-H凝含量.
- 优化配方,水与水泥的比率和早期碳化暴露是开发高效的MgO-SiO2水泥系统的关键,其强度提高并减少对反应性的依赖.
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