The effect of artificial leaching with HCl on chloride binding in ordinary Portland cement paste

被引：67
作者：
Hemstad, Petter [1 ]
Machner, Alisa [1 ]
De Weerdt, Klaartje [1 ]
机构：
[1] NTNU, Dept Struct Engn, Richard Birkelands Vei 1a, N-7491 Trondheim, Norway
来源：
CEMENT AND CONCRETE RESEARCH | 2020年 / 130卷
关键词：
PHASE ASSEMBLAGE; PORE SOLUTION; CONCRETE; CALCIUM; IMPACT; PREDICTION; METAKAOLIN; STABILITY; PROFILES; DOLOMITE;
D O I：
10.1016/j.cemconres.2020.105976
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This study investigates how the pH in the pore solution influences the chloride binding in Portland cement pastes. Cement paste samples were exposed to NaCl, CaCl2 and HCl solutions. The mechanisms of changes in chloride binding were investigated using a wide variety of techniques both for the liquid and solid phase. Lowering the pH from 13 to 12 with CaCl2 or HCl greatly increased chloride binding compared to NaCl, which was associated with increased amounts of chlorides in the AFm-phases. Lowering the pH below 12 lead to reduced chloride binding in part due to dissolution of AFm. Chloride binding approached zero at a pH of 9. The influence of C-S-H on changes in chloride binding could not be conclusively determined. The impact of leaching and low pH on chloride binding is key to explaining the peaking behaviour of chloride profiles in concrete submerged in chloride containing solutions like sea water.
引用
收藏
页数：17
相关论文
共 43 条
  • [1] Critical chloride content in reinforced concrete - A review
    Angst, Ueli
    Elsener, Bernhard
    Larsen, Claus K.
    Vennesland, Oystein
    [J]. CEMENT AND CONCRETE RESEARCH, 2009, 39 (12) : 1122 - 1138
  • [2] [Anonymous], 2006, MOD COD SERV LIF DES
  • [3] [Anonymous], 2013, Model Code for Concrete Structures 2010
  • [4] Balonis M., 2012, THESIS
  • [5] Impact of chloride on the mineralogy of hydrated Portland cement systems
    Balonis, Magdalena
    Lothenbach, Barbara
    Le Saout, Gwenn
    Glasser, Fredrik P.
    [J]. CEMENT AND CONCRETE RESEARCH, 2010, 40 (07) : 1009 - 1022
  • [6] Comparing chloride ingress from seawater and NaCl solution in Portland cement mortar
    De Weerdt, K.
    Lothenbach, B.
    Geiker, M. R.
    [J]. CEMENT AND CONCRETE RESEARCH, 2019, 115 : 80 - 89
  • [7] Impact of the associated cation on chloride binding of Portland cement paste
    De Weerdt, K.
    Colombo, A.
    Coppola, L.
    Justnes, H.
    Geiker, M. R.
    [J]. CEMENT AND CONCRETE RESEARCH, 2015, 68 : 196 - 202
  • [8] The impact of sulphate and magnesium on chloride binding in Portland cement paste
    De Weerdt, K.
    Orsakova, D.
    Geiker, M. R.
    [J]. CEMENT AND CONCRETE RESEARCH, 2014, 65 : 30 - 40
  • [9] Towards the understanding of chloride profiles in marine exposed concrete, impact of leaching and moisture content
    De Weerdt, Klaartje
    Orsakova, Denisa
    Muller, Arnaud C. A.
    Larsen, Claus K.
    Pedersen, Bard
    Geiker, Mette R.
    [J]. CONSTRUCTION AND BUILDING MATERIALS, 2016, 120 : 418 - 431
  • [10] Changes in the phase assemblage of concrete exposed to sea water
    De Weerdt, Klaartje
    Justnes, Harald
    Geiker, Mette R.
    [J]. CEMENT & CONCRETE COMPOSITES, 2014, 47 : 53 - 63
12345