Properties of Organic Acid Activated Metakaolin Concrete

Abstract

Abstract: Kaolin is a common clay minerals in nature and a layered aluminosilicate mineral. Small molecule oxalic acid and citric acid were selected as composite organic acids, and kaolin was subjected to acid activation treatment to prepare an organic acid activated metakaolin by high temperature calcination and mechanical grinding. The influences of organic acid activation methods on the microstructure of kaolin were analyzed through SEM and TEM, and the influence of organic acid activated metakaolin on macroscopic properties such as mechanical properties, drying shrinkage performance, electrical flux of concrete and microscopic pore structure was studied, and its microscopic mechanism of action was revealed. The results show that organic acid activation leads to the dissolution of some Si and Al in kaolin, causing damage to the edges and interlayer of the layered structure, resulting in a relatively rough microstructure. The calcination temperature decreases by 160 ℃ and the specific surface area increases. Adding organic acid activated metakaolin to concrete can improve the comprehensive performance of concrete by enhancing the compactness of concrete. The compressive strength at 28 d increases by 23.2%, and the 28 d electric flux is reduced by 51.8%, which is superior to metakaolin and silica fume.

Key words: kaolin, organic acid activation, organic acid, concrete, macro performance, microstructure

CLC Number:

TU526

LI An, WANG Yanjun, ZHANG Zhijie, FAN Zhihong. Properties of Organic Acid Activated Metakaolin Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(7): 2434-2440.

References

[1] 任超, 倪文, 王勇华. 湿选钢渣尾泥的机械活化及其在混凝土中的应用[J]. 混凝土, 2023(2): 114-118.
REN C, NI W, WANG Y H. Mechanical activation of wet sorted steel slag mud and its application in concrete[J]. Concrete, 2023(2): 114-118 (in Chinese).
[2] 张涛, 陈铁军, 陈永亮, 等. 机械活化和不锈钢渣掺量对矿渣胶凝材料性能的影响[J]. 硅酸盐通报, 2022, 41(2): 553-561.
ZHANG T, CHEN T J, CHEN Y L, et al. Effects of mechanical activation and stainless steel slag content on properties of slag cementitious materials[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(2): 553-561 (in Chinese).
[3] 梁志鹏, 孙畅, 毕万利, 等. 高硅型铁尾矿机械活化效果及机理研究[J]. 硅酸盐通报, 2022, 41(8): 2810-2818.
LIANG Z P, SUN C, BI W L, et al. Mechanical activation of high silicon iron tailings and its mechanism[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(8): 2810-2818 (in Chinese).
[4] 张晓林, 夏光华, 曹文. 机械活化强化二氧化硫脲漂白高岭土的试验研究[J]. 硅酸盐通报, 2016, 35(4): 1053-1056+1073.
ZHANG X L, XIA G H, CAO W. Bleaching kaolin with thiourea dioxide strengthened by mechanical activation[J]. Bulletin of the Chinese Ceramic Society, 2016, 35(4): 1053-1056+1073 (in Chinese).
[5] 李城林, 张超, 李润国, 等. 热活化中级铝硅比煤矸石对复合水泥性能及水化的影响[J]. 西南科技大学学报, 2023, 38(3): 8-15.
LI C L, ZHANG C, LI R G, et al. Mass ratio on the performance and hydration of compound cement[J]. Journal of Southwest University of Science and Technology, 2023, 38(3): 8-15 (in Chinese).
[6] 胡彪, 李先海, 晏祥政, 等. 热活化煤矸石粉对基体-骨料界面过渡区性能的影响[J]. 硅酸盐通报, 2023, 42(4): 1315-1322.
HU B, LI X H, YAN X Z, et al. Influence of thermal activated coal gangue powder on properties of interface transition zone between matrix and aggregate[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(4): 1315-1322 (in Chinese).
[7] 杜晓伟, 刘辉, 李文举, 等. 掺加热活化油页岩半焦混凝土的耐久性[J]. 硅酸盐通报, 2023, 42(4): 1428-1436+1465.
DU X W, LIU H, LI W J, et al. Durability of heat activated oil shale semi-coke concrete[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(4): 1428-1436+1465 (in Chinese).
[8] ZHANG L J, HE Y, LÜ P, et al. Comparison of microwave and conventional heating routes for kaolin thermal activation[J]. Journal of Central South University, 2020, 27(9): 2494-2506.
[9] 盖珂瑜, 王桂明, 孙涛, 等. 水洗高岭土活化特性及评价方法[J]. 硅酸盐通报, 2020, 39(11): 3601-3608.
GE K Y, WANG G M, SUN T, et al. Activation characteristics and evaluation of water-washed kaolin[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(11): 3601-3608 (in Chinese).
[10] 盖珂瑜. 不同成因高岭土热活化特性比较研究[D]. 武汉: 武汉理工大学, 2019.
GE K Y. Comparative study on thermal activation characteristic of kaolin with different origins[D].Wuhan: Wuhan University of Technology, 2019 (in Chinese).
[11] CASTILLO L A, BARBOSA S E, MAIZA P, et al. Surface modifications of talcs. Effects of inorganic and organic acid treatments[J]. Journal of Materials Science, 2011, 46(8): 2578-2586.
[12] STEUDEL A, BATENBURG L F, FISCHER H R, et al. Alteration of swelling clay minerals by acid activation[J]. Applied Clay Science, 2009(44): 95-104.
[13] 欧延, 林敬东, 陈文瑞, 等. 酸改性高岭土的结构与性能的研究[J]. 厦门大学学报(自然科学版), 2004, 43(2): 272-274.
OU Y, LIN J D, CHEN W R, et al. A study on structure and characteristic of acid-modified kaolin[J]. Journal of Xiamen University (Natural Science), 2004, 43(2): 272-274 (in Chinese).
[14] 徐晓燕. 复合有机酸活化高岭土及其在陶瓷工业上的应用研究[D]. 广州: 华南理工大学, 2014.
XU X Y. Kaolinite modified by compound organic acids and its application in ceramic industry[D].Guangzhou: South China University of Technology, 2014 (in Chinese).
[15] 彭能. 有机酸活化高岭土及其在碱激发胶凝材料中的应用研究[D]. 武汉: 湖北大学, 2018.
PENG N. Application of organic acid to kaolin and its application in alkali activated cementitious materials[D].Wuhan: Hubei University, 2018 (in Chinese).
[16] LIN S M, YU Y L, ZHANG Z J, et al. The synergistic mechanisms of citric acid and oxalic acid on the rapid dissolution of kaolinite[J]. Applied Clay Science, 2020, 196: 105756.