Determination of free chloride in seawater cement paste with low water-binder ratio

Published on Nov 1, 2021in Cement & Concrete Composites7.586
· DOI :10.1016/J.CEMCONCOMP.2021.104217
Yifan Zhao1
Estimated H-index: 1
,
Xiang Hu11
Estimated H-index: 11
+ 2 AuthorsDeju Zhu30
Estimated H-index: 30
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Abstract
References30
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#1Zongyun Mo (HIT: Harbin Institute of Technology)H-Index: 2
#2Rui Wang (Beijing University of Technology)H-Index: 3
Last. Xiaojian Gao (HIT: Harbin Institute of Technology)H-Index: 25
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Abstract In this paper, the hydration process and mechanical properties of UHPC matrix incorporated with limestone (LS) and different substitution rates of metakaolin (MK) were investigated. MK was added with five levels of substitution (0, 5%, 10%, 15% and 20%) and LS was kept at 30% of the total binder mass. Mechanical properties, hydration heat, hydration products and pore structure measurements were carried out for every mixture. The results show that the hydration rate as well as the hydrat...
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#1Peiran Li (UTS: University of Technology, Sydney)H-Index: 3
#2Wengui Li (UTS: University of Technology, Sydney)H-Index: 37
Last. Vivian W.Y. Tam (USYD: University of Sydney)H-Index: 73
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Abstract Using seawater for concrete manufacturing promisingly provides significant economical and environmental benefits. In this study, ordinary Portland cement (OPC) hydration in distilled water and seawater and the corresponding evolution of solid phases was investigated by heat evolution, hydrated phase, hydration kinetics, and microstructure characterization. The results show that seawater can promote the early hydration of tricalcium silicate (C3S) during the hydration acceleration period...
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#1Xiang Hu (Hunan University)H-Index: 11
#2Caijun Shi (Hunan University)H-Index: 73
Last. Geert De Schutter (UGent: Ghent University)H-Index: 39
view all 5 authors...
Abstract Pore solution expression is a widely accepted approach to extract pore solution of cement-based materials by appllying high pressure. In this study, the variations of pore solution distribution and chloride content in cement pastes before and after pore solution expression were examined. The results showed that the value of chloride concentration index Nc were mostly higher than 1.0 for cement pastes immersed in NaCl solution, and decreased with the chloride concentration of soaking sol...
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#1Xiang Hu (Hunan University)H-Index: 11
#2Caijun Shi (Hunan University)H-Index: 73
Last. Geert De Schutter (UGent: Ghent University)H-Index: 39
view all 4 authors...
Abstract In this study, the effects of different factors on chloride concentration index (Nc) of cement paste were studied. The factors including chloride concentration in soaking solution, slag replacement, external applied voltage and cation ions of soaking solution were all studied from the electrical double layer (EDL) properties point of view. Zeta potential and proton Nuclear Magnetic Resonance (1H NMR) measurements were conducted to investigate the properties of electrical double layer fo...
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#1Shiyu Sui (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 2
#2William Wilson (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 10
Last. Karen Scrivener (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 87
view all 7 authors...
Abstract This paper presents a comparison of methods to quantify the chloride binding capacity for cementitious materials composed of Ordinary Portland Cement (OPC) and Limestone (LS, 0 to 55% replacement). Physical and chemical chloride bindings were investigated to better understand the binding capacity of the different systems and to provide basic information for modelling. Cement pastes samples were exposed to a 0.5 M NaCl solution and their chloride contents were quantified as free ions in ...
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#1Yunyao Wang (WUT: Wuhan University of Technology)H-Index: 10
#2Zhonghe Shui (WUT: Wuhan University of Technology)H-Index: 30
Last. Xunguang Xiao (WUT: Wuhan University of Technology)H-Index: 3
view all 6 authors...
Abstract This study investigates the effects of aluminum compound on the binding of admixed chloride in cementitious materials. Three commonly available aluminum compounds, aluminum oxide, aluminum hydroxide and colloidal nano-alumina are applied. The bound chloride content, hydration products and calcium hydroxide content are analyzed. The results show that aluminum compounds transform to AFm phases such as carboaluminate, monosulfoaluminate if there is no available chloride. When the mixing wa...
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#1Ippei Maruyama (Nagoya University)H-Index: 23
#2Takahiro Ohkubo (Chiba University)H-Index: 11
Last. Ryo Kurihara (Nagoya University)H-Index: 5
view all 4 authors...
Abstract In this study, the rate of change of microstructural re-organization in hardened cement paste under the first drying, which is caused by the colloidal nature of calcium-silicate-hydrate (C-S-H), is confirmed via 1 H nuclear magnetic resonance relaxometry. Under the first drying, water evaporates from larger pores, while the interlayer water begins to increase. During the mass change, interlayer water continues to increase until reaching a peak. After the peak has been reached, interlaye...
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#3Liang Li (NYUAD: New York University Abu Dhabi)H-Index: 2
Abstract The freshwater consumption in concrete production has been notably increased, owing to the worldwide demand from the construction sector for the industrial and urban developments. To meet the requirements in the long term, reconsidering the seawater usage in concrete production, as an alternative to freshwater, perhaps can be a sustainable solution. Doing that, the freshwater resource can be effectively preserved, also the durability issues of concrete materials and structures based on ...
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#2Nima Farzadnia (Hunan University)H-Index: 23
#3Caijun Shi (Hunan University)H-Index: 73
Abstract Very low water-to-binder ratio of ultra-high performance concrete (UHPC) may facilitate using seawater as the mixing water, as there may not be sufficient moisture and air in its dense matrix to initiate the corrosion of steel reinforcements. However, extensive research is needed to investigate the effects of intermixed chloride from seawater on fresh and hardened properties UHPC. This study investigated the role of seawater in the interaction of slag and silica fume with cement in very...
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#1Xiang Hu (Hunan University)H-Index: 11
#2Caijun Shi (Hunan University)H-Index: 73
Last. Geert De Schutter (UGent: Ghent University)H-Index: 39
view all 5 authors...
In this paper, the zeta potential of freshly mixed cement paste and hardened cement pastes, as well as the concentration index, was measured. The influences of chloride concentration in mixing water and slag content on zeta potential of freshly mixed pastes were studied. A proposed model was expressed to explain the relationship of zeta potential and concentration index of hardened cement pastes immersed in chloride solution. The results showed that the increase of chloride concentration in mixi...
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