CSH-蒙脱石界面能对水泥固化蒙脱土抗压强度的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (3): 827-836.

所属专题：水泥混凝土

CSH-蒙脱石界面能对水泥固化蒙脱土抗压强度的影响

葛津宇¹, 韦华¹, 徐菲¹, 韩雪松¹, 朱鹏飞¹, 肖怀前², 李怀森¹

1.南京水利科学研究院,材料结构研究所,南京 210029;
2.江苏省淮沭新河管理处,淮安 223001

收稿日期:2022-10-20 修订日期:2022-12-14 出版日期:2023-03-15 发布日期:2023-03-31
通信作者: 徐菲,博士,高级工程师。E-mail:fxu@nhri.cn
作者简介:葛津宇(1998—),男,硕士研究生。主要从事水泥黏土复合材料的研究。E-mail:w8880600@163.com
基金资助:
国家自然科学基金(52109161);中国博士后科学基金(2021M691630);水利部技术示范项目(SF202109);中央级公益性科研院所基本科研业务费专项资金(Y421002);新沂河海口枢纽水利科技项目(HKZJG-KY-01)

Influence of CSH-Montmorillonite Interface Energy on Compressive Strength of Cement-Stabilized Montmorillonite Clay

GE Jinyu¹, WEI Hua¹, XU Fei¹, HAN Xuesong¹, ZHU Pengfei¹, XIAO Huaiqian², LI Huaisen¹

1. Materials & Structural Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029, China;
2. Jiangsu Huaishuxin River Administration Office, Huai’an 223001, China

Received:2022-10-20 Revised:2022-12-14 Online:2023-03-15 Published:2023-03-31

摘要/Abstract

摘要： 为探明水化硅酸钙(CSH)凝胶-蒙脱石界面能对水泥固化蒙脱土无侧限抗压强度的影响,通过分子动力学模拟方法对蒙脱石和CSH结合界面区能量进行定量计算,并结合灰色关联度分析和X射线衍射(XRD)表征,讨论模型的正确性和偏差来源。研究表明:CSH-蒙脱石界面能由范德华力、氢键能与静电作用组成;CSH-蒙脱石界面能与水泥固化蒙脱土无侧限抗压强度具有较好的相关性,界面能随着水分子数增加而降低,随着蒙脱石层数增多而先减小后增大;通过调整水胶比及胶土比可使CSH-蒙脱石界面处斥力达到最大或引力达到最小,进而控制水泥固化蒙脱土无侧限抗压强度性能达到最优。

关键词: 分子动力学, 水泥固化蒙脱土, 界面能, 无侧限抗压强度, 微观物相, 灰色关联度分析

Abstract: In order to investigate the influence of calcium silicate hydrate (CSH) gel-montmorillonite interface energy on unconfined compressive strength of cement-stabilized montmorillonite clay, the energy of the interface area between montmorillonite and CSH was quantitatively calculated by molecular dynamics simulation method. Then, combining with the grey correlation degree analysis and X-ray diffraction (XRD), the correctness and deviation sources of the model were discussed. The results show that the CSH-montmorillonite interface energy consists of van der Waals force, hydrogen bonding energy and electrostatic interaction. There is a good correlation between the CSH-montmorillonite interface energy and unconfined compressive strength of cement-stabilized montmorillonite clay. The interface energy decreases with the increase of water molecules, and decreases first and then increases with the increase of montmorillonite layers. At the CSH-montmorillonite interface, the repulsive force can be maximized or the gravitational force can be minimized by adjusting the water-to-cement ratio and the cement-to-soil ratio to obtain an optimal unconfined compressive strength of the cement-stabilized montmorillonite clay.

Key words: molecular dynamic, cement-stabilized montmorillonite clay, interface energy, unconfined compressive strength, microscopic phase, grey relational degree analysis

中图分类号:

TU526

葛津宇, 韦华, 徐菲, 韩雪松, 朱鹏飞, 肖怀前, 李怀森. CSH-蒙脱石界面能对水泥固化蒙脱土抗压强度的影响[J]. 硅酸盐通报, 2023, 42(3): 827-836.

GE Jinyu, WEI Hua, XU Fei, HAN Xuesong, ZHU Pengfei, XIAO Huaiqian, LI Huaisen. Influence of CSH-Montmorillonite Interface Energy on Compressive Strength of Cement-Stabilized Montmorillonite Clay[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 827-836.

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CSH-蒙脱石界面能对水泥固化蒙脱土抗压强度的影响

Influence of CSH-Montmorillonite Interface Energy on Compressive Strength of Cement-Stabilized Montmorillonite Clay

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