硬脂酸钠对碱激发矿渣-赤泥胶凝材料吸水速率的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (5): 1778-1784.

所属专题：资源综合利用

硬脂酸钠对碱激发矿渣-赤泥胶凝材料吸水速率的影响

姚凯^1,2,3, 李青^1,2,3,4, 王鹏淮^1,2,3, 陈平^1,2,3,4, 李俊潼^1,2,3, 明阳^2,3,4

1.桂林理工大学材料科学与工程学院,桂林 541004;
2.广西建筑新能源与节能重点实验室,桂林 541004;
3.广西北部湾绿色海工材料工程研究中心,桂林 541004;
4.有色金属矿产勘查与资源高效利用省部共建协同创新中心,桂林 541004

收稿日期:2022-12-30 修订日期:2023-03-15 出版日期:2023-05-15 发布日期:2023-06-01
通信作者: 陈平,博士,教授。E-mail: chenping8383@188.com
作者简介:姚凯(1997—),男,硕士研究生。主要从事碱激发胶凝材料制备及耐久性的研究。E-mail:1499253969@qq.com
基金资助:
国家自然科学基金(52268039);国家重点研发计划(2019YFC1906202);广西青年基金(2021GXNSFBA220047);广西人才专项(2021AC19339); 广西建筑新能源与节能重点实验室项目(桂科能22-J-21-21)

Effect of Sodium Stearate on Water Absorption Rate of Alkali-Activated Slag-Red Mud Cementitious Material

YAO Kai^1,2,3, LI Qing^1,2,3,4, WANG Penghuai^1,2,3, CHEN Ping^1,2,3,4, LI Juntong^1,2,3, MING Yang^2,3,4

1. School of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China;
2. Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin 541004, China;
3. Guangxi Beibu Gulf Engineering Research Center for Green Marine Materials, Guilin 541004, China;
4. Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi, Guilin 541004, China

Received:2022-12-30 Revised:2023-03-15 Online:2023-05-15 Published:2023-06-01

摘要/Abstract

摘要： 碱激发矿渣-赤泥胶凝材料(AASR)由于吸水速率较大,水分和侵蚀性离子易进入AASR内部,对其耐久性构成重大威胁。本文利用硬脂酸钠(NaSt)改善AASR的孔结构,并在孔隙壁上引入憎水膜,降低AASR的吸水速率。通过对AASR孔结构、接触角和微观形貌的分析,揭示了NaSt对AASR吸水速率的改善机理。结果表明:NaSt在AASR内部引入了较多的封闭孔,内部孔隙之间的连通性会被这些封闭气孔阻断,从而阻断水分在AASR孔径中的传输;NaSt在毛细孔壁形成憎水膜,增大了孔壁接触角,降低了毛细管吸力;掺入质量分数为0.5%的NaSt后,AASR的初始吸水速率的降低幅度高达83%,但对力学性能影响较小。

关键词: 碱矿渣-赤泥胶凝材料, 硬脂酸钠, 吸水速率, 孔结构, 憎水膜, 力学性能

Abstract: Due to alkali-activated slag-red mud cementitious material (AASR) with high water absorption rate, water and erosive ions are easily enter into AASR interior, which poses a great threat to AASR durability. Sodium stearate (NaSt) was used to improve the pore structure of AASR, and a water-repellent film was introduced on the pore wall, which reduces its water absorption rate of AASR. The improvement mechanism of NaSt on the water absorption rate of AASR was revealed by analysing of the pore structure, contact angle and micromorphology of AASR. The results shows that NaSt introduces more closed pores into AASR interior and the connectivity of the internal pores will be blocked by these closed pores, thus the water transport is blocked in the AASR pore size. A water-repellent film formed by NaSt is formed in the capillary wall, which increases the contact angle of the pore wall and reduces the capillary suction. The reduction of initial water absorption rate of AASR with adding 0.5% (mass fraction) NaSt is up to 83%, but it has less effect on mechanical properties.

Key words: alkali-activated slag-red mud cementitious material, sodium stearate, water absorption rate, pore structure, hydrophobic film, mechanical property

中图分类号:

TU528

姚凯, 李青, 王鹏淮, 陈平, 李俊潼, 明阳. 硬脂酸钠对碱激发矿渣-赤泥胶凝材料吸水速率的影响[J]. 硅酸盐通报, 2023, 42(5): 1778-1784.

YAO Kai, LI Qing, WANG Penghuai, CHEN Ping, LI Juntong, MING Yang. Effect of Sodium Stearate on Water Absorption Rate of Alkali-Activated Slag-Red Mud Cementitious Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(5): 1778-1784.

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硬脂酸钠对碱激发矿渣-赤泥胶凝材料吸水速率的影响

Effect of Sodium Stearate on Water Absorption Rate of Alkali-Activated Slag-Red Mud Cementitious Material

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