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首页 > 过刊浏览>2023年第26卷第11期 >1214-1219. DOI:10.3969/j.issn.1007-9629.2023.11.010
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碱激发体系凝结时间和早期抗压强度变化规律
作者:
作者单位:

河海大学 土木与交通学院，江苏 南京 210024

作者简介:

郑蕻陈（2000—），男，山东枣庄人，河海大学硕士生.E-mail： 2802872945@qq.com

通讯作者:

刘 琳（1983—），女，河北衡水人，河海大学教授，博士生导师，博士.E-mail： liulin@hhu.edu.cn

中图分类号:

TU526

基金项目:

国家自然科学基金资助项目（52322805，51978241）


Variation of Setting Time and Early Age Compressive Strength of Alkali Activated System
Author:
Affiliation:

College of Civil and Transportation Engineering， Hohai University， Nanjing 210024， China

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    摘要:

    系统研究了以NaOH、水玻璃以及NaOH复掺Na2CO3为激发剂，激发矿渣、粉煤灰、矿渣/粉煤灰和矿渣/水泥4种胶凝体系的凝结时间和7 d抗压强度变化规律，获得了凝结时间与掺量变化公式及早期抗压强度预测公式.结果表明：单一NaOH或水玻璃激发矿渣条件下，掺入少量粉煤灰、水泥对改善复掺体系凝结时间的效果不显著，并且均会降低早期抗压强度；采用NaOH/Na2CO3复合激发剂后，能够有效延长体系凝结时间，在一定程度上提高体系抗压强度.针对NaOH/Na2CO3复掺激发矿渣/水泥体系凝结时间和抗压强度出现“不增却减”的现象，深入讨论了掺NaOH/Na2CO3复合激发剂的作用机理.

    Abstract:

    Using NaOH， waterglass and a mixture of NaOH and Na2CO3 as activators， changes of setting time and 7 d compressive strength for four kinds of binding systems including alkali activated slag， fly ash， slag/fly ash and slag/cement were studied systematically， and the fitting formulas for the changes in setting time and the prediction of early age compressive strength were obtained. The results show that under the condition of single NaOH or waterglass activating slag， adding a small amount of fly ash or cement has no significant effect on the setting time， but will reduce the compressive strength at early age. NaOH/Na2CO3 compound activator can effectively prolong the setting time and improve the compressive strength to a certain extent. In addition， the setting time and compressive strength of slag/cement system activated by NaOH do not increase but decrease due to the addition of Na2CO3. The mechanism of the effect of NaOH/Na2CO3 compound activator is discussed.

    表 3 Na2CO3对碱激发胶凝材料凝结时间与早期抗压强度的影响Table 3 Effect of sodium carbonate on setting time and early age compressive strength of alkali activated materials
    表 1 各胶凝材料化学组成Table 1 Chemical compositions of cementitious materials
    表 2 单一胶凝材料凝结时间与早期抗压强度Table 2 Setting time and early age compressive strength of single binding materials
    参考文献
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郑蕻陈,刘琳.碱激发体系凝结时间和早期抗压强度变化规律[J].建筑材料学报,2023,26(11):1214-1219

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  • 收稿日期:2023-03-16
  • 最后修改日期:2023-07-16
  • 在线发布日期: 2024-01-26
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