硅灰对聚羧酸减水剂的吸附作用

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (1): 183-190.

硅灰对聚羧酸减水剂的吸附作用

张建纲¹, 杨勇¹, 毛永琳¹, 周栋梁¹, 李申振¹, 王涛²

1.江苏苏博特新材料股份有限公司,高性能土木工程材料国家重点实验室,南京 211108;
2.南京博特新材料有限公司,江苏省功能性聚醚工程技术研究中心,南京 210047

收稿日期:2023-07-21 修订日期:2023-10-23 出版日期:2024-01-15 发布日期:2024-01-16
作者简介:张建纲(1981—),男,高级工程师。主要从事混凝土化学外加剂的开发与应用技术研究工作。E-mail:zhangjiangang@cnjsjk.cn
基金资助:
国家自然科学基金青年基金(52108218)

Adsorption of Polycarboxylate Superplasticizer by Silica Fume

ZHANG Jiangang¹, YANG Yong¹, MAO Yonglin¹, ZHOU Dongliang¹, LI Shenzhen¹, WANG Tao²

1. State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing 211108, China;
2. Jiangsu Functional Polyether Engineering Technology Research Center Nanjing, Nanjing Bote New Materials Co., Ltd., Nanjing 210047, China

Received:2023-07-21 Revised:2023-10-23 Online:2024-01-15 Published:2024-01-16

摘要/Abstract

摘要： 快速、高效分散含有大掺量硅灰、微珠等超细粉体的胶凝材料是制备超高性能混凝土的关键技术。本文通过Zeta电位和总有机碳方法研究了硅灰与聚羧酸减水剂(PCE)的作用关系。结果表明,在纯水溶液中,硅灰表面呈负电性,对PCE及其侧链单体甲基烯丙基聚氧乙烯醚(HPEG)有极强的吸附能力,而对带有负电荷的主链结构聚丙烯酸钠(PAANa)吸附能力较弱。在水泥浆体孔隙溶液中,硅灰的表面仍然呈负电性,但绝对值明显降低,对PCE及其侧链的吸附量有一定的降低,对主链结构的吸附能力增强。根据Langmuir等温吸附方程对吸附测试结果的拟合以及理论计算,可以推断出硅灰在纯水中对聚羧酸侧链结构的吸附性主要来源于氢键作用,这种作用在水泥孔隙溶液中有所减弱。

关键词: 聚羧酸减水剂, 硅灰, 甲基烯丙基聚氧乙烯醚, Zeta电位, 吸附

Abstract: Rapid and efficient dispersion of cementitious material containing large amounts of silica fume, microspheres, and other ultrafine powders is key technology for preparing ultra-high performance concrete. The interaction relation of polycarboxylate superplasticizer (PCE) and silica fume were studied by Zeta potential and total organic carbon method. The results show that surface charge of silica fume in water is negative, and has strong adsorption to PCE and its side chain monomermethacryloxypropyl polyethylene glycol ether (HPEG), while silica fume has weak adsorption to negatively charged main chain sodium polyacrylate (PAANa). In cement paste pore solution, the Zeta potential of silica fume is still negative, but the absolute value declines significantly, meanwhile the total adsorption amount of PCE and its side chain declines, while the adsorption amount of main chain increases. According to the fitting of Langmuir isotherm equation and theoretical calculation, it suggests that the adsorption of side chain structure of polycarboxylate by silica fume mainly comes from hydrogen bonding, which is weakened in cement paste pore solution.

Key words: polycarboxylate superplasticizer, silica fume, methacryloxypropyl polyethylene glycol ether, Zeta potential, adsorption

中图分类号:

TU528

张建纲, 杨勇, 毛永琳, 周栋梁, 李申振, 王涛. 硅灰对聚羧酸减水剂的吸附作用[J]. 硅酸盐通报, 2024, 43(1): 183-190.

ZHANG Jiangang, YANG Yong, MAO Yonglin, ZHOU Dongliang, LI Shenzhen, WANG Tao. Adsorption of Polycarboxylate Superplasticizer by Silica Fume[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 183-190.

参考文献

[1] PLANK J, SAKAI E, MIAO C W, et al. Chemical admixtures: chemistry, applications and their impact on concrete microstructure and durability[J]. Cement and Concrete Research, 2015, 78: 81-99.
[2] JANOWSKA-RENKAS E. The effect of superplasticizers’ chemical structure on their efficiency in cement pastes[J]. Construction and Building Materials, 2013, 38: 1204-1210.
[3] 孙振平. 聚羧酸系减水剂研究亟待解决的6大难题[J]. 建筑材料学报, 2020, 23(1): 128-129.
SUN Z P. Six urgent problems in the further study on polycarboxylate based plasticizers[J]. Journal of Building Materials, 2020, 23(1): 128-129 (in Chinese).
[4] 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.
[5] SHU X, RAN Q P, LIU J P, et al. Tailoring the solution conformation of polycarboxylate superplasticizer toward the improvement of dispersing performance in cement paste[J]. Construction and Building Materials, 2016, 116: 289-298.
[6] 熊军红, 欧阳东. 黏土矿物对聚羧酸减水剂在净浆、砂浆和混凝土中分散性的影响[J]. 硅酸盐通报, 2023, 42(7): 2344-2353.
XIONG J H, OUYANG D. Influences of clay minerals on dispersibility of polycarboxylate superplasticizer in paste, mortar and concrete[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(7): 2344-2353 (in Chinese).
[7] ALONSO M M, PALACIOS M, PUERTAS F. Compatibility between polycarboxylate-based admixtures and blended-cement pastes[J]. Cement and Concrete Composites, 2013, 35(1): 151-162.
[8] 李蒙蒙, 舒鑫, 韩方玉, 等. 聚羧酸减水剂在碱激发矿渣胶凝材料中的研究进展[J]. 硅酸盐通报, 2023, 42(10): 3432-3438.
LI M M, SHU X, HAN F Y, et al. Research progress of polycarboxylate superplasticizer in alkali-activated slag cementitious materials[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(10): 3432-3438 (in Chinese).
[9] 李申桐, 杨勇, 周栋梁, 等. 疏水改性聚醚合成聚羧酸减水剂及其降粘性能研究[J]. 硅酸盐通报, 2022, 41(7): 2251-2257.
LI S T, YANG Y, ZHOU D L, et al. Study on synthesis of polycarboxylic acid water reducer by hydrophobic modified polyether and its viscosity reduction performance[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(7): 2251-2257 (in Chinese).
[10] 王振, 李化建, 黄法礼, 等. 典型岩性机制砂的吸附行为研究[J]. 建筑材料学报, 2023, 26(3): 251-258.
WANG Z, LI H J, HUANG F L, et al. Adsorption behavior of typical lithological manufactured sands[J]. Journal of Building Materials, 2023, 26(3): 251-258 (in Chinese).
[11] 李北星, 吕敦祥, 乔敏. 花岗岩机制砂细粉对聚羧酸减水剂吸附性能的影响[J]. 建筑材料学报, 2022, 25(12): 1284-1292.
LI B X, LÜ D X, QIAO M. Effect of microfines in granite manufactured sand on adsorption characteristics of polycarboxylate superplasticizer[J]. Journal of Building Materials, 2022, 25(12): 1284-1292 (in Chinese).
[12] BURGOS-MONTES O, PALACIOS M, RIVILLA P, et al. Compatibility between superplasticizer admixtures and cements with mineral additions[J]. Construction and Building Materials, 2012, 31: 300-309.
[13] 代柱端. 减水剂对不同胶凝材料的吸附及流变性调控机理[D]. 武汉: 武汉理工大学, 2014.
DAI Z D. Adsorption of water reducer on different cementitious materials and rheological regulation mechanism[D].Wuhan: Wuhan University of Technology, 2014 (in Chinese).
[14] SCHRÖFL C, GRUBER M, PLANK J. Preferential adsorption of polycarboxylate superplasticizers on cement and silica fume in ultra-high performance concrete (UHPC)[J]. Cement and Concrete Research, 2012, 42(11): 1401-1408.
[15] HOMMER H. Interaction of polycarboxylate ether with silica fume[J]. Journal of the European Ceramic Society, 2009, 29(10): 1847-1853.
[16] HIRATA T, BRANICIO P, YE J, et al. Atomistic dynamics simulation to solve conformation of model PCE superplasticisers in water and cement pore solution[J]. Advances in Cement Research, 2017, 29(10): 418-428.
[17] FLATT R J, SCHOBER I, RAPHAEL E, et al. Conformation of adsorbed comb copolymer dispersants[J]. Langmuir, 2009, 25(2): 845-855.
[18] UNGER K K. Chapter 1: general chemistry of silica[J]. Journal of Chromatography Library, 1979, 16: 1-14.
[19] NG S, PLANK J. Interaction mechanisms between Na montmorillonite clay and MPEG-based polycarboxylate superplasticizers[J]. Cement and Concrete Research, 2012, 42(6): 847-854.
[20] 张世城, 陈建国, 蒋亚清, 等. 聚羧酸减水剂在粘土中的插层行为及影响研究进展[J]. 硅酸盐通报, 2018, 37(3): 903-910.
ZHANG S C, CHEN J G, JIANG Y Q, et al. Research on intercalation behavior and influence of polycarboxylate superplasticizer in clay[J]. Bulletin of the Chinese Ceramic Society, 2018, 37(3): 903-910 (in Chinese).