Water Resistance of Flue Gas Desulfurization Building Gypsum Modified by Ordinary Portland Cement

Abstract

Abstract: The gypsum has been limited in building field due to its poor water resistance. The modified flue gas desulfurization (FGD) building gypsum with well water resistance and low cost was fabricated with the FGD building gypsum and ordinary Portland cement as raw materials in this paper. The effect of cement content on physical properties, phase composition, and microstructure of hydrated samples was systematically investigated. Results show that with the increase of the ordinary Portland cement content, the content of AFt, CH, and C-S-H increases, which fill the pores, so that the water absorption decreases first and then increases, while the softening coefficient, contact angle, and hardness show an opposite trend. When the content of cement is 18% (mass fraction), the hydrated sample shows a well water resistance. This study provides a technical basis for the preparation of the FGD building gypsum and its products with well water resistance, low-cost, and environment-friendly, which also has an important significance to the popularization and application of the FGD gypsum.

Key words: flue gas desulfurization building gypsum, ordinary Portland cement, water resistance, contact angle

CLC Number:

TU526

GUO Huishi, WANG Qingpei, ZHANG Guo, LI Wenfeng, MENG Erchao, CHEN Wenliang, HUI Shouhua, ZHOU Liming. Water Resistance of Flue Gas Desulfurization Building Gypsum Modified by Ordinary Portland Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2288-2295.

References

[1] 张绍奇,郭荣鑫,林志伟,等.工业副产石膏制备半水硫酸钙晶须的研究现状[J].硅酸盐通报,2020,39(11):3528-3534.
ZHANG S Q, GUO R X, LIN Z W, et al. Research status of preparation of calcium sulfate hemihydrate whisker from industrial by-product gypsum[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(11): 3528-3534 (in Chinese).
[2] 刘鹏强,钟雯,赵云龙.针式冲击磨在脱硫建筑石膏中的应用[J].粉煤灰综合利用,2016,29(3):45-46.
LIU P Q, ZHONG W, ZHAO Y L. Application of needle type impact grinding on desulfurization calcined gypsum[J]. Fly Ash Comprehensive Utilization, 2016, 29(3): 45-46 (in Chinese).
[3] YAKOVLEV G, POLYANSKIKH I, FEDOROVA G, et al. Anhydrite and gypsum compositions modified with ultrafine man-made admixtures[J]. Procedia Engineering, 2015, 108: 13-21.
[4] 郭会师,杨政宏,李文凤,等.蓝晶石基微孔莫来石陶瓷分离膜支撑体的制备、结构与性能研究[J].硅酸盐通报,2015,34(12):3546-3550+3556.
GUO H S, YANG Z H, LI W F, et al. Preparation, microstructure and properties of microporous mullite ceramic membrane supports based on kyanite[J]. Bulletin of the Chinese Ceramic Society, 2015, 34(12): 3546-3550+3556 (in Chinese).
[5] 陈燕,岳文海,董若兰.石膏建筑材料[M].2版.北京:中国建材工业出版社,2012:30-50.
CHEN Y, YUE W H, DONG R L. Gypsum building material[M]. 2nd ed. Beijing: China Building Materials Press, 2012: 30-50 (in Chinese).
[6] VIDALES-BARRIGUETE A, ATANES-SÁNCHEZ E, DEL RÍO-MERINO M, et al. Analysis of the improved water-resistant properties of plaster compounds with the addition of plastic waste[J]. Construction and Building Materials, 2020, 230: 116956.
[7] 王栋民,张琳.干混砂浆原理与配方指南[M].北京:化学工业出版社,2010:8-50.
WANG D M, ZHANG L. Guide to principles and formulations of dry mixed mortar[M]. Beijing: Chemical Industry Press, 2010: 8-50 (in Chinese).
[8] 余海燕,王武祥,杨久俊.水泥基多孔材料孔结构与吸声性能关系研究[J].混凝土与水泥制品,2015(5):93-98.
YU H Y, WANG W X, YANG J J. Study on relationship between pore structure and sound absorption performance of cement-based porous materials[J]. China Concrete and Cement Products, 2015(5): 93-98 (in Chinese).
[9] 田佳瑜,王海峰,尤晓宇,等.磷石膏激发预处理及其制备免烧建材的研究[J].硅酸盐通报,2020,39(12):3897-3904.
TIAN J Y, WANG H F, YOU X Y, et al. Excitation pretreatment of phosphogypsum and preparation of non-burning building materials[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(12): 3897-3904 (in Chinese).
[10] 康明,朱洪波,王培铭.矿粉、高钙灰及脱硫石膏对水泥收缩性能的影响[J].建筑材料学报,2008,11(2):189-194.
KANG M, ZHU H B, WANG P M. Effect of grinded blast furnace slag high-calcium fly ash and desulfurized gypsum on shrinkage performance of cement mortars[J]. Journal of Building Materials, 2008, 11(2): 189-194 (in Chinese).
[11] 李志新,徐开东,彭家惠,等.粉煤灰对再生建筑石膏性能的影响[J].材料科学与工程学报,2019,37(3):474-479+508.
LI Z X, XU K D, PENG J H, et al. Influence of fly ash on properties of recycled plaster[J]. Journal of Materials Science and Engineering, 2019, 37(3): 474-479+508 (in Chinese).
[12] AHMED A. Compressive strength and microstructure of soft clay soil stabilized with recycled bassanite[J]. Applied Clay Science, 2015, 104: 27-35.
[13] PUNDIR A, GARG M, SINGH R. Evaluation of properties of gypsum plaster-superplasticizer blends of improved performance[J]. Journal of Building Engineering, 2015, 4: 223-230.
[14] 温久然,耿飞,高妮,等.氯化钡和聚乙烯醇复掺改性石膏正交试验研究[J].硅酸盐通报,2017,36(9):3144-3149.
WEN J R, GENG F, GAO N, et al. Orthogonal test of modified gypsum by Barium chloride and polyvinyl alcohol[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(9): 3144-3149 (in Chinese).
[15] PERVYSHIN G N, YAKOVLEV G I, GORDINA A F, et al. Water-resistant gypsum compositions with man-made modifiers[J]. Procedia Engineering, 2017, 172: 867-874.
[16] 王东.不同有机硅憎水剂对建筑石膏性能的影响[J].新型建筑材料,2014,41(2):68-70+89.
WANG D. Effect of different organic silicone hydrophobic agent on properties of building gypsum[J]. New Building Materials, 2014, 41(2): 68-70+89 (in Chinese).
[17] 沈威,黄文熙,闵盘荣.水泥工艺学[M].武汉:武汉理工大学出版社,1991:6-8.
SHEN W, HUANG W X, MIN P R. Cement technology[M]. Wuhan: Wuhan University of Technology Press, 1991: 6-8 (in Chinese).
[18] 马红恩,吴其胜,钱旭阳,等.硅烷改性苯丙乳液对脱硫石膏防水性能的影响[J].材料科学与工程学报,2020,38(2):269-273+307.
MA H E, WU Q S, QIAN X Y, et al. Effect of silane modified styrene-acrylic emulsion on waterproof properties of desulfurized gypsum[J]. Journal of Materials Science and Engineering, 2020, 38(2): 269-273+307 (in Chinese).
[19] 耿飞,桂敬能,曹欣欣,等.脱硫石膏基复合胶凝材料的物理力学性能试验[J].南京航空航天大学学报,2019,51(1):124-130.
GENG F, GUI J N, CAO X X, et al. Study on physical and mechanical properties of FGD gypsum-based cementitious materials[J]. Journal of Nanjing University of Aeronautics & Astronautics, 2019, 51(1): 124-130 (in Chinese).
[20] 袁英豪,蔡基伟,罗斐,等.铝酸盐水泥对石膏基材料强度及耐水性的改善[J].化学研究,2018,29(2):208-212.
YUAN Y H, CAI J W, LUO F, et al. Improving effect of aluminate cement on strength and water resistance of gypsum-based materials[J]. Chemical Research, 2018, 29(2): 208-212 (in Chinese).
[21] 彭家惠,楼宗汉.钙矾石形成机理的研究[J].硅酸盐学报,2000,28(6):511-515.
PENG J H, LOU Z H. Study on the mechanism of ettringite formation[J]. Journal of the Chinese Ceramic Society, 2000, 28(6): 511-515 (in Chinese).
[22] 江嘉运,毕菲,肖姗姗.石膏基复合胶凝材料的物理力学性能研究[J].硅酸盐通报,2017,36(11):3803-3809.
JIANG J Y, BI F, XIAO S S. Physical and mechanical properties of gypsum based compound cementing materials[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(11): 3803-3809 (in Chinese).