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首页 > 过刊浏览>2023年第26卷第7期 >816-822. DOI:10.3969/j.issn.1007-9629.2023.07.015
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机械-水热联合法制备高活性硅酸二钙
作者:
作者单位:

1.同济大学 材料科学与工程学院，上海 201804;2.同济大学 先进土木工程材料教育部重点实验室，上海 201804

作者简介:

杨正宏（1967—），男，安徽六安人，同济大学教授，博士生导师，博士. E-mail：tjzhy92037@163.com

通讯作者:

徐玲琳（1986—），女，江苏建湖人，同济大学副教授，博士生导师，博士. E-mail：xulinglin@126.com

中图分类号:

TU528

基金项目:

国家自然科学基金资助项目（52172022）；同济大学大型仪器开放测试基金项目（2022GX010）


Preparation of Highly Reactive Dicalcium Silicate by Mechano- Hydrothermal Processing
Author:
Affiliation:

1.School of Materials Science and Engineering， Tongji University， Shanghai 201804， China;2.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education， Tongji University， Shanghai 201804， China

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    摘要:

    以稻壳灰和Ca（OH）2为原料，B2O3为稳定剂，通过机械-水热联合法制备了高活性硅酸二钙（C2S），研究了预处理工艺对稻壳灰活性以及烧成制度对硅酸二钙活性的影响.结果表明：稻壳灰经1%稀硫酸溶液预处理2.5 h后煅烧，可使稻壳灰活性增高，有利于提高水热合成的效率；分段煅烧和掺入0.5%的B2O3促进了β-C2S的形成，并提升了其早期水化活性，有利于强度发展；按钙硅比为2配制的物料经球磨2.0 h、水热4.0 h后，先在500 ℃下预烧1.0 h，再升温至600 ℃煅烧1.0 h，可得到高活性硅酸二钙，其水化7、28 d后的抗压强度分别为33.0 、41.1 MPa.

    Abstract:

    Highly reactive dicalcium silicate was prepared by mechano-hydrothermal processing using rice husk ash and Ca（OH）2 as raw materials， and B2O3 as stabilizer. The effects of pretreatment process on the activity of rice husk ash and calcination system were studied. The results show that the rice husk ash is highly activated by pretreating with 1% dilute sulfuric acid solution for 2.5 h and calcining， which favors to the efficiency improvement of hydrothermal synthesis. Both annealing and addition of 0.5% B2O3 contribute to the formation of β-C2S and enhance its early hydration activity， which is beneficial to the strength development. The optimum procedure is ball-milling for 2.0 h， then hydrothermal condition for 4.0 h， followed by preheating at 500 ℃ for 1.0 h， and finally calcining at 600 ℃ for 1.0 h. The compressive strength of highly reactive dicalcium silicate reaches 33.0 MPa and 41.1 MPa after 7 d and 28 d of curing， respectively.

    表 1 P600和R500的化学组成Table 1 Chemical compositions of P600 and R500
    表 2 样品的配合比Table 2 Mix proportions of samples
    图1 不同稻壳灰与Ca（OH）2反应3 d后水化产物的XRD谱图Fig.1 XRD patterns of hydration products from reaction of different rice husk ashes and Ca（OH）2 for 3 d
    图2 不同温度下煅烧所得稻壳灰与Ca（OH）2反应3 d水化产物的TG-DTG曲线Fig.2 TG-DTG patterns of hydration products from reaction of Ca（OH）2 and rice husk ash calcinated at different temperatures
    图3 样品的XRD图谱Fig.3 XRD patterns of samples
    图4 样品HPB水热产物经不同烧成制度所得硅酸二钙的XRD图谱Fig.4 XRD patterns of C2S from products of sample HPB
    图5 不同烧成制度所得硅酸二钙水化放热速率和累计放热曲线Fig.5 Rate of heat flow and cumulative heat of C2S obtained at different sintering regimes
    图6 水化时间为30 h内硅酸二钙水化产物的XRD图谱Fig.6 XRD patterns of C2S hydration products with of hydration time at 30 h
    图7 水化时间为7、28 d的硅酸二钙水化产物的XRD图谱Fig.7 XRD patterns of C2S hydration products with hydration time at 7 d and 28 d
    表 3 不同烧成制度所得硅酸二钙水化7、28 d后的抗压强度Table 3 7 d and 28 d compressive strength of C2S obtained at different sintering regimes
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杨正宏,何翠兰,李祯,李博,徐玲琳.机械-水热联合法制备高活性硅酸二钙[J].建筑材料学报,2023,26(7):816-822

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  • 收稿日期:2022-07-09
  • 最后修改日期:2022-09-08
  • 在线发布日期: 2023-09-15
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