利用硬脂酸钙改善孔结构以降低碱矿渣水泥石吸水速率

doi:10.11896/cldb.20100086

Abstract
Figure/Table
References
Related Citation (15)

Download:

Full Text ( PDF ) (7586KB)
Export: BibTeX | EndNote (RIS)

Abstract The water sorptivity of alkali-activated slag cement is usually 3—5 times higher than that of ordinary Portland cement, which has serious negative effect on its durability. It is difficult to effectively reduce the water sorptivity of alkali-activated slag cement by traditional methods (such as increasing the compactness and adjusting the mix proportion). In this work, calcium stearate (CaSt) was used to improve the pore structure of alkali-activated slag, and calcium stearate hydrophobic film was introduced into the pore wall to reduce the water sorptivity of AAS. The effect of CaSt on the pore structure and water sorptivity of AAS was studied by means of MIP and SEM. The results show that CaSt can improve microstructure of AAS, reduce the hydration product defects, reduce the pore connectivity, and be able to form CaSt film on the surface of the hydration products, and thus the water sorptivity of AAS was reduced by about 80%. Meanwhile, it should be highlighted that in the AAS system, calcium stearate is not only a hydrophobic component, but also a pore structure modifier, making it have a good promotion potential.

Key words： calcium stearate alkali activated slag water sorptivity pore structure

Published: 10 December 2021 Online: 2021-12-23

CLC number:

TU528

Fund:National Key Research and Development Program of China (2019YFC1906202), the Innovation Driven Major Projects in Guangxi (2018AA23004) and Guike Neng (19-J-22-3)

Corresponding Authors: yang.kai@cqu.edu.cn

About author: Qing Li, a teacher of Guilin University of Technology, graduated from College of Materials Science and Engineering in Chongqing University, received his Ph. D. degree in June 2020. He has published about 10 papers in SCI/EI journals, and applied for 2 national invention patents. His research work mainly focuses on cement-based materials and alkali activated materials.
Kai Yang, graduated from Chongqing University from 2001 to 2008. From 2008 to 2012, he obtained a Ph.D. degree in engineering from the School of Civil Enginee-ring of Queen's University. From 2013 to now, he has taught in the Department of Buil-ding Materials at Chongqing University. In 2015, he won the first prize in the second young teachers' lecture competition of building materials; in 2015, he was a senior visiting scholar of UCL School of Civil and Environmental Engineering; in 2015, he was a visiting scholar of the School of Civil Engineering of Queen's University of England; He has published more than 30 papers in SCI/EI journals at home and abroad, and applied for 4 national invention patents.

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	LI Qing
	YANG Changhui
	CHEN Ping
	YANG Kai
	MING Yang
	ZHAO Yanrong

Cite this article:

LI Qing,YANG Changhui,CHEN Ping, et al. Improving Pore Structure by Calcium Stearate to Reduce Water Sorptivity of Alkali-Activated Slag[J]. Materials Reports, 2021, 35(23): 23241-23245.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20100086 OR http://www.mater-rep.com/EN/Y2021/V35/I23/23241

1 Pu X C, Gan C C. Concrete, 1991(5), 13 (in Chinese).
蒲心诚,甘昌成. 混凝土,1991(5),13.
2 Pu X C, Gan C C, Wu L X, et al. Building Energy Efficiency, 1988(1), 8 (in Chinese).
蒲心诚,甘昌成,吴礼贤,等.建筑节能,1988(1),8.
3 Pu X C, Gan C C. China Concrete and Cement Products, 1991(6), 4 (in Chinese).
蒲心诚,甘昌成.混凝土与水泥制品,1991(6),4.
4 Yang K, Yang C H, Magee B, et al. Cement and Concrete Composites, 2016 (73), 19.
5 Collins F G, Sanjayan J G. Journal of Materials in Civil Engineering, 2010, 22 (3), 260.
6 Law D, Adam A, Molyneaux T, et al. Materials and Structures, 2012, 45 (9), 1425.
7 Rostami M, Behfarnia K. Construction and Building Materials, 2017, 134, 262.
8 Ismail I, Bernal S A, Provis J L, et al. Construction and Building Mate-rials, 2013, 48, 1187.
9 Behfarnia K, Rostami M. Construction and Building Materials, 2017, 131, 205.
10 Jiang R, Zhang P, Zhao T J, et al. New Building Materials, 2010, 37 (9), 61 (in Chinese).
姜蓉,张鹏,赵铁军,等.新型建筑材料,2010,37(9),61.
11 Ge Z M. Concrete admixture (second edition), Chemical Industry Publishing House, China,2015 (in Chinese).
葛兆明. 混凝土外加剂(第二版),化学工业出版社,2015.
12 Maryoto A. Procedia Engineering, 2017, 171, 511.
13 Falchi L, Muller U, Fontana P, et al. Construction and Building Mate-rials, 2013, 49, 272.
14 Pu X C. Alkali-activated slag cement and concrete, Science Publishing House,China, 2010 (in Chinese).
蒲心诚. 碱矿渣水泥与混凝土, 科学出版社,2010.
15 Li Q, Yang Y, Yang K, et al. Cement and Concrete Composites, 2019, 103, 242.
16 Hewlett P, Chem C, Frsc F, et al. Lea's chemistry of cement and concrete, John Wiley and Sons, USA, 2003, pp. 471.
17 Law D W, Adam A A, Molyneaux T K. et al. Materials and Structures, 2012, 45(9), 1425.
18 Zeng Q, Li K F, Chong T, et al. Cement and Concrete Composites, 2012, 34(9), 1053.
19 Shi D, Winslow D N. Cement and Concrete Research, 1985, 15,135.
20 George P A, Constantinos E S. Chemical Engineering Communications, 2000, 81(1), 179.
21 Rajabipour F, Weiss J. Materials and Structures, 2007, 40(10), 1143.
22 Song S, Sohn D, Jennings H, et al. Journal of Materials Science, 2000, 35, 249.