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首页 > 过刊浏览>2024年第27卷第12期 >1159-1168. DOI:10.3969/j.issn.1007-9629.2024.12.011
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水胶比对碱激发矿渣早期反应动力学的影响
作者:
作者单位:

青岛理工大学 土木工程学院， 山东 青岛 266520

作者简介:

张兆瑞 （1995—），男，山东菏泽人，青岛理工大学博士生.E-mail：zhangzhaoruisdhz@163.com

通讯作者:

金祖权（1977—），男，四川阆中人，青岛理工大学教授，博士生导师，博士.E-mail：jinzuquan@126.com

中图分类号:

TU521

基金项目:

国家自然科学基金资助项目（52078259）；交通运输行业重点项目（2021-ZD1-012）


Effect of Water-Binder Ratio on Early Reaction Kinetics of Alkali-Activated Slag
Author:
Affiliation:

School of Civil Engineering， Qingdao University of Technology， Qingdao 266520， China

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    摘要:

    为研究水胶比对碱激发矿渣早期反应动力学的影响，采用1H低场核磁共振测试了矿渣浆体碱激发3 d的横向弛豫时间与不同状态水相对含量的变化，并通过29Si魔角自旋核磁共振、等温量热、热重分析和傅里叶变换红外光谱测试，揭示了早期矿渣碱激发过程的机理. 结果表明：不同水胶比下矿渣浆体的横向弛豫时间随着碱激发反应的进行逐渐减小，可动水逐渐转化为不可动水；在碱激发3 d时，随着水胶比的增加，高聚合度碱激发产物增加；［AlO4］-四面体提高了［SiO4］4-四面体的聚合程度和连接作用.

    Abstract:

    To investigate the effect of water-binder ratio on the early reaction kinetics of alkali-activated slag， 1H low-field nuclear magnetic resonance was used to measure the transverse relaxation time of the slag slurry in the first 3 d of alkali-activation and the relative content changes of water in different states. 29Si magic-angle spinning nuclear magnetic resonance， isothermal calorimetry， thermogravimetric analysis and Fourier transform infrared spectroscopy were used to reveal the reaction mechanism of slag alkali-activated at the early stage. The results show that the transverse relaxation time of slag slurry under different water-binder ratio conditions decreases gradually with the alkali-activated reaction， and the movable water is gradually transformed to immovable. After 3 d of alkaline-activation， the high degree polymerization of alkaline-activated products increases with the increase in water-binder ratio. ［AlO4］- tetrahedra increase the degree of polymerization and linkage of ［SiO4］4- tetrahedra.

    图1 矿渣的SEM照片和XRD图谱Fig.1 SEM image and XRD pattern of slag
    图2 矿渣浆体的T2分布Fig.2 T2 distributions of slag pastes
    图3 不同mW/mB下矿渣碱激发3 d时的29Si 魔角自旋核磁共振谱Fig.3 29Si magic-angle spinning nuclear magnetic resonance spectra of slag with different mW/mB under 3 d of alkali-activation
    图4 矿渣浆体的放热曲线Fig.4 Heat release curves of slag pastes
    图5 不同mW/mB矿渣浆体碱激发2 h的TG数据Fig.5 TG data of slag pastes with different mW/mB under 2 h of alkali-activation
    图6 矿渣浆体在不同碱激发时间下的FTIR图谱Fig.6 FTIR spectra of slag pastes at different alkali-activation time（mW/mB=0.45）
    图7 矿渣浆体碱激发3 d时T2wav与累计碱激发放热量的比较Fig.7 Comparison between T2wav and cumulative heat of alkali-activated of slag paste at alkali-activated 3 d
    图8 2种测试方法之间的关系Fig.8 Relationship between two testing methods
    表 1 矿渣的化学组成Table 1 Chemical composition（by mass） of slag
    表 2 矿渣浆体的配合比Table 2 Mix proportions of slag pastes
    表 3 不同mW/mB矿渣浆体中不动水和可动水含量随时间的变化Table 3 Time-dependent variation of immovable and mobile water contents（by mass） of slag pastes with different mW/mB
    图1 矿渣的SEM照片和XRD图谱Fig.1 SEM image and XRD pattern of slag
    图2 矿渣浆体的T2分布Fig.2 T2 distributions of slag pastes
    图3 不同mW/mB下矿渣碱激发3 d时的29Si 魔角自旋核磁共振谱Fig.3 29Si magic-angle spinning nuclear magnetic resonance spectra of slag with different mW/mB under 3 d of alkali-activation
    图4 矿渣浆体的放热曲线Fig.4 Heat release curves of slag pastes
    图5 不同mW/mB矿渣浆体碱激发2 h的TG数据Fig.5 TG data of slag pastes with different mW/mB under 2 h of alkali-activation
    图6 矿渣浆体在不同碱激发时间下的FTIR图谱Fig.6 FTIR spectra of slag pastes at different alkali-activation time（mW/mB=0.45）
    图7 矿渣浆体碱激发3 d时T2wav与累计碱激发放热量的比较Fig.7 Comparison between T2wav and cumulative heat of alkali-activated of slag paste at alkali-activated 3 d
    图8 2种测试方法之间的关系Fig.8 Relationship between two testing methods
    表 1 矿渣的化学组成Table 1 Chemical composition（by mass） of slag
    表 2 矿渣浆体的配合比Table 2 Mix proportions of slag pastes
    表 3 不同mW/mB矿渣浆体中不动水和可动水含量随时间的变化Table 3 Time-dependent variation of immovable and mobile water contents（by mass） of slag pastes with different mW/mB
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张兆瑞,金祖权,李宁.水胶比对碱激发矿渣早期反应动力学的影响[J].建筑材料学报,2024,27(12):1159-1168

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