Adsorption of Polycarboxylate Superplasticizer by Silica Fume

Abstract

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

CLC Number:

TU528

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.

References

[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).