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| 碱掺量和模数对高炉矿渣/粉煤灰复合胶凝材料全养护龄期水化进程的影响 |
| The effects of the alkali content and modulus on the hydration process of blast furnace slag/fly ash composite cementitious materials throughout the curing age |
| 投稿时间：2025-02-25 修订日期：2025-02-25 |
| DOI： |
| 中文关键词: 粉煤灰 粒化高炉矿渣 实际孔隙液 pH 碱含量 模数 |
| 英文关键词: Fly ash granulated blast furnace slag ion concentration pH Alkali content modulus |
| 基金项目:湖北省自然科学基金创新发展联合基金（2024AFD107）；湖北省教育厅科研计划（Q20221806） |
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| 中文摘要: |
| 摘要：碱激发胶凝材料具有绿色、低碳的优良特点，是重要的建筑材料。本实验以碱激发胶凝材料孔隙液中凝胶骨架核心元素的浓度变化为切入点，系统研究了碱激发剂模数及碱掺量对粒化高炉矿渣-粉煤灰复合材料在养护龄期水化进程的影响。研究结果表明，当碱掺量在2%到8%范围内变化时，与水化进程息息相关的硅元素浓度先增加后减小，当碱掺量为4%时，最有利于水化凝胶的形成。当碱掺量为4%时，相比碱掺量为2%，孔隙液中更高的碱金属离子浓度加速了硅铝酸盐矿物溶解，相比碱掺量为8%，孔隙液更好的离子流动性加速了聚合反应进行；碱激发剂模数在0.5~1范围内变化时，更高的模数不仅可以促进孔隙液中更多的游离碱金属离子参与凝胶的电荷平衡，还能促进硅酸盐矿物的溶解，二者协同作用使碱激发复合胶凝材料的水化过程显著加快。 |
| 英文摘要: |
| Abstract:Alkali-activated cementitious materials exhibit outstanding attributes of being green and low-carbon, serving as significant construction materials. This experiment takes the concentration alterations of the core elements of the gel skeleton in the pore solution of alkali-activated cementitious materials as the starting point and systematically investigates the influences of the alkali dosage within the alkali activator and the modulus on the hydration process of the granulated blast furnace slag-fly ash composite cementitious materials during the curing age. The research findings indicate that when the alkali dosage varies within the range of 2% to 8%, the concentration of silicon, which is closely associated with the hydration process, initially increases and subsequently decreases. When the alkali dosage is 4%, it is most favorable for the formation of the hydration gel. When the alkali dosage is 4%, compared with 2%, the higher concentration of alkali metal ions in the pore solution expedites the dissolution of aluminosilicate minerals. Compared with 8%, the superior ionic mobility in the pore solution accelerates the polymerization reaction. When the modulus of the alkali activator varies within the range of 0.5 to 1, a higher modulus not only promotes a greater number of free alkali metal ions in the pore solution to participate in the charge balance of the gel but also facilitates the dissolution of silicate minerals, being more conducive to the progression of the hydration process of the composite cementitious materials. |
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