环氧乳液改性水泥基材水化过程的硬化机理

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (4): 1229-1236.

环氧乳液改性水泥基材水化过程的硬化机理

蒋正施¹, 李鹏飞¹, 汪承志¹, 杜三林², 冯冬颖³

1.重庆交通大学河海学院,重庆 400074;
2.华能西藏水电安全工程技术研究中心,林芝 860000;
3.清华大学建筑设计研究院有限公司,北京 100084

收稿日期:2021-10-28 修回日期:2022-01-29 出版日期:2022-04-15 发布日期:2022-04-27
通讯作者: 李鹏飞,副教授。E-mail:lipengfei@cqjtu.edu.cn
作者简介:蒋正施(1996—),女,硕士研究生。主要从事港工新材料的研究。E-mail:Jzs@mails.cqjtu.edu.cn
基金资助:
中国华能研究项目(HNKJ19-H13);重庆市研究生科研创新项目(CYS21349)

Hardening Mechanism on Hydration Process of Epoxy Latexes-Modified Cementitious Materials

JIANG Zhengshi¹, LI Pengfei¹, WANG Chengzhi¹, DU Sanlin², FENG Dongying³

1. College of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
2. Huaneng Tibet Hydropower Safety Engineering Technology Research Center, Linzhi 860000, China;
3. Tsinghua University Architectural Design and Research Institute Co., Ltd., Beijing 100084, China

Received:2021-10-28 Revised:2022-01-29 Online:2022-04-15 Published:2022-04-27

摘要/Abstract

摘要： 极端环境和复杂荷载条件对混凝土结构的材料性能提出了更高的要求,聚合物通过改性水泥基材提高混凝土性能的方法已经得到了广泛应用。本研究为揭示环氧乳液改性水泥基材水化过程的硬化机理,通过等温放热试验分析环氧乳液对水泥水化放热过程的影响,结合原位XRD技术跟踪水泥主要矿物熟料和水化产物在水化反应早期的相含量发展。研究结果表明,环氧乳液对水泥水化的阻滞作用与环氧颗粒、水泥矿物熟料和水化产物之间的相互作用有关,并随着水化时间的延长,相互作用效果越明显。在水泥胶凝体系中,环氧乳液会减缓水化放热速率,降低水化放热峰值,减少累积放热量。环氧乳液通过抑制水泥矿物(C₃S、C₃A、石膏)的溶解和水化产物(钙矾石、氢氧化钙)的析出,延缓硅酸盐反应和铝酸盐反应;环氧乳液对水泥水化的影响随着其掺量的增加而增强。

关键词: 阻滞作用, 环氧乳液, 水泥矿物熟料, 水化放热, 等温放热, 原位XRD

Abstract: Extreme environment and complex load conditions put forward higher requirements for the material properties of concrete. The method of improving concrete performance by modifying cement-based material with polymer has been widely used. To reveal the hardening mechanism of the hydration process of epoxy latexes-modified cementitious materials, the influence of epoxy latexes on the hydration process of cement hydration was studied by isothermal calorimetry, and the phase evolution of the cement clinker minerals and hydration products was tracked by in-situ XRD. The results show that the retardation effect of epoxy latexes on cement hydration is related to the interaction among epoxy particles, cement clinker minerals and hydration products, and the interaction effect becomes more obvious with time-dependent. When epoxy latexes are added into the cement paste, the heat-generation rate slows down, and the heat flow peak and cumulative heat generation reduce. Epoxy latexes can delay silicate reaction and aluminate reaction by inhibiting the dissolution of cement minerals (C₃S, C₃A and gypsum) and the precipitation of hydration products (ettringite and portlandite). The effect of epoxy latexes on cement hydration increases with the increase of its content.

Key words: retardation effect, epoxy latexes, cement clinker mineral, heat generation, isothermal calorimetry, in-situ XRD

中图分类号:

TQ172.79

蒋正施, 李鹏飞, 汪承志, 杜三林, 冯冬颖. 环氧乳液改性水泥基材水化过程的硬化机理[J]. 硅酸盐通报, 2022, 41(4): 1229-1236.

JIANG Zhengshi, LI Pengfei, WANG Chengzhi, DU Sanlin, FENG Dongying. Hardening Mechanism on Hydration Process of Epoxy Latexes-Modified Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(4): 1229-1236.

参考文献

[1] 史庆轩,戎翀,陈云枭.FRP-钢-混凝土组合柱的研究现状[J].建筑材料学报,2019,22(3):431-439.
SHI Q X, RONG C, CHEN Y X. Research status of FRP-steel-concrete composite columns[J]. Journal of Building Materials, 2019, 22(3): 431-439 (in Chinese).
[2] 宋东方,刘富强,罗闯旦,等.聚合物改性水泥基材料力学性能研究[J].中国科技论文,2019,14(12):1311-1316.
SONG D F, LIU F Q, LUO C D, et al. Study on mechanical properties of cement materials modified by polymer[J]. China Sciencepaper, 2019, 14(12): 1311-1316 (in Chinese).
[3] 邓春林,范洪浩,张琴飞,等.船闸工程混凝土裂缝控制技术[J].水运工程,2015(3):123-127.
DENG C L, FAN H H, ZHANG Q F, et al. Cracks control of concrete for locks[J]. Port & Waterway Engineering, 2015(3): 123-127 (in Chinese).
[4] 钟世云,王培铭.聚合物改性砂浆和混凝土的微观形貌[J].建筑材料学报,2004,7(2):168-173.
ZHONG S Y, WANG P M. Study of morphology of polymer-modified mortar and concrete[J]. Journal of Building Materials, 2004, 7(2): 168-173 (in Chinese).
[5] 张爱勤,贾坚,刘芝敏,等.环氧树脂对混凝土抗盐冻能力的影响研究[J].硅酸盐通报,2019,38(4):1278-1283.
ZHANG A Q, JIA J, LIU Z M, et al. Influence of epoxy resin on salt scaling resistance of concrete[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(4): 1278-1283 (in Chinese).
[6] LI P F, LU W, AN X H, et al. Effect of epoxy latexes on the mechanical behavior and porosity property of cement mortar with different degrees of hydration and polymerization[J]. Materials, 2021, 14(3): 517.
[7] 黄华,朱亮,黄敏,等.不同材料改性混凝土的性能研究及现状分析[J].硅酸盐通报,2018,37(6):1887-1896.
HUANG H, ZHU L, HUANG M, et al. Research and analysis on the performance of modified concrete with different materials[J]. Bulletin of the Chinese Ceramic Society, 2018, 37(6): 1887-1896 (in Chinese).
[8] 衡艳阳,赵文杰.聚合物改性水泥基材料的研究进展[J].硅酸盐通报,2014,33(2):365-371.
HENG Y Y, ZHAO W J. Research development of polymer modified cement based materials[J]. Bulletin of the Chinese Ceramic Society, 2014, 33(2): 365-371 (in Chinese).
[9] FERNÁNDEZ-RUIZ M A, GIL-MARTÍN L M, CARBONELL-MÁRQUEZ J F, et al. Epoxy resin and ground tyre rubber replacement for cement in concrete: compressive behaviour and durability properties[J]. Construction and Building Materials, 2018, 173: 49-57.
[10] 王茹,姚丽娟,王培铭.水泥基材料聚合物改性机理研究的最新进展[J].硅酸盐通报,2011,30(4):818-821.
WANG R, YAO L J, WANG P M. Recent research development on mechanism of polymer modification to cement-based materials[J]. Bulletin of the Chinese Ceramic Society, 2011, 30(4): 818-821 (in Chinese).
[11] 华先乐,王鑫鹏,胡晓霞,等.聚合物水泥混凝土的研究和应用进展[J].青岛理工大学学报,2020,41(5):133-140.
HUA X L, WANG X P, HU X X, et al. Advances in polymer cement concrete: research and application[J]. Journal of Qingdao University of Technology, 2020, 41(5): 133-140 (in Chinese).
[12] ZHANG Y Y, CHANG J, JI J. AH₃ phase in the hydration product system of AFt-AFm-AH₃ in calcium sulfoaluminate cements: a microstructural study[J]. Construction and Building Materials, 2018, 167: 587-596.
[13] CHANG J, ZHANG Y Y, SHANG X P, et al. Effects of amorphous AH₃ phase on mechanical properties and hydration process of C₄A₃$\bar{S}$-C$\bar{S}$H₂-CH-H₂O system[J]. Construction and Building Materials, 2017, 133: 314-322.
[14] CHEN C J, AN X H. Model for simulating the effects of particle size distribution on the hydration process of cement[J]. Computers & Concrete, 2012, 9(3): 179-193.
[15] LI Y, GUO Y C, LYU Z H, et al. Investigation of the effect of waterborne epoxy resins on the hydration kinetics and performance of cement blends[J]. Construction and Building Materials, 2021, 301: 124045.
[16] JANSEN D, GOETZ-NEUNHOEFFER F, STABLER C, et al. A remastered external standard method applied to the quantification of early OPC hydration[J]. Cement and Concrete Research, 2011, 41(6): 602-608.
[17] VALENTINI L, DALCONI M C, FAVERO M, et al. In-situ XRD measurement and quantitative analysis of hydrating cement: implications for sulfate incorporation in C-S-H[J]. Journal of the American Ceramic Society, 2015, 98(4): 1259-1264.
[18] JUILLAND P, GALLUCCI E, FLATT R, et al. Dissolution theory applied to the induction period in alite hydration[J]. Cement and Concrete Research, 2010, 40(6): 831-844.
[19] KONG X M, PAKUSCH J, JANSEN D, et al. Effect of polymer latexes with cleaned serum on the phase development of hydrating cement pastes[J]. Cement and Concrete Research, 2016, 84: 30-40.
[20] PLANK J, HIRSCH C. Impact of zeta potential of early cement hydration phases on superplasticizer adsorption[J]. Cement and Concrete Research, 2007, 37(4): 537-542.