Influence of Mineral Admixtures on Chloride Binding Capacity of Portland Cement Paste

被引：0
|
作者：
Tang H. [1 ]
Zuo X. [1 ]
Zou Y. [1 ]
Liu J. [1 ]
机构：
[1] Department of Civil Engineering, School of Science, Nanjing University of Science and Technology, Nanjing
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2023年 / 26卷 / 06期
关键词：
blended cement paste; chloride binding capacity; fly ash; ground granulated blast furnace slag; thermodynamic modeling;
D O I：
10.3969/j.issn.1007-9629.2023.06.001
中图分类号：
学科分类号：
摘要：
Some Portland cement pastes with different contents of fly ash（FA） and ground granulated blast furnace slag（GGBS） were immersed in NaCl solution with different concentrations for corrosion experiments. Through silver nitrate titration， X‑ray diffraction（XRD） and thermodynamic simulation， the variation rule of free chloride concentration in solution and the contents of various phases in cement pastes were analyzed. Results show that addition of FA and GGBS will reduce free chloride concentration in NaCl solution and improve the chloride binding capacity of hardened cement pastes. Addition of GGBS will result in an increase of AFm phase and an improvement of chemical binding capacity of chloride in hardened cement pastes. Meanwhile FA can improve the physical binding capacity of C‑（A）‑S‑H in hardened cement pastes， the hardened cement paste with FA content of 40% has the optimum physical binding capacity of chloride. © 2023 Tongji University. All rights reserved.
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页码：571 / 578
页数：7
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  • [1] LU Y Y, XING F, SHI G Y, Et al., Interpretation on the influence of chloride ion on early hydration evolution for cementitious materials by a non‑contact monitoring method［J］, Construction and Building Materials, 199, (2019)
  • [2] GAO Yun, WU Kai, MU Song, A pore structure based prediction of chloride diffusivity for cement paste［J］, Journal of Building Materials, 25, 4, (2022)
  • [3] SUN Congtao, SONG Hua, NIU Ditao, Et al., Chloride binding capacity of fly ash concrete［J］, Journal of Building Materials, 19, 1, (2016)
  • [4] WAN Xiaomei, HAN Xiao, YU Qi, Et al., Solidification of chloride ions in alkali‑activated slag paste［J］, Journal of Building Materials, 24, 5, (2021)
  • [5] GUO Minglei, XIAO Jia, ZUO Shenghao, Chloride binding capacity of hydrated C<sub>3</sub>A pastes［J］, Journal of Building Materials, 22, 3, (2019)
  • [6] YANG Z Q, GAO Y, MU S, Et al., Improving the chloride binding capacity of cement paste by adding nano‑Al<sub>2</sub>O<sub>3</sub>［J］, Construction and Building Materials, 195, (2019)
  • [7] CAO Y Z, GUO L P, CHEN B, Et al., Thermodynamic modelling and experimental investigation on chloride binding in cement exposed to chloride and chloride‑sulfate solution［J］, Construction and Building Materials, 246, (2020)
  • [8] ISMAIL I, BERNAL S A, PROVIS J L, Et al., Influence of fly ash on the water and chloride permeability of alkali‑activated slag mortars and concretes［J］, Construction and Building Materials, 48, 11, (2013)
  • [9] WAN Xiaomei, LIU Guoqiang, ZHAO Tiejun, Et al., Investigation on adsorption behavior of chloride by calcium silicate hydrate and calcium aluminum silicate hydrate［J］, Journal of Building Materials, 22, 1, (2019)
  • [10] LIU Z Y, XU D, GAO S, Et al., Assessing the adsorption and diffusion behavior of multicomponent ions in saturated calcium silicate hydrate gel pores using molecular dynamics［J］, ACS Sustainable Chemistry and Engineering, 8, 9, (2020)
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