Influence of Materials Ratio on the Hydration Process of Magnesium Oxychloride Cement

2015 ◽  
Vol 817 ◽  
pp. 180-184 ◽  
Author(s):  
Jing Wen ◽  
Hong Fa Yu ◽  
Xue Ying Xiao ◽  
Jin Mei Dong
Keyword(s):  
Heat Release ◽  
Total Heat ◽  
Hydration Process ◽  
Molar Ratio ◽  
Volume Stability ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Release Ratio ◽  
Induction Stage ◽  
Oxychloride Cement

Magnesium oxychloride cement (MOC) has the characteristics of big heat and heat concentration in the hydration process. During the hydration process there is an adverse effect on the formation of hydration products and strength as well as volume stability. The hydration heat method was used to study the hydration process of MOC and analyze the influence of materials ratio on the hydration process in the present investigation. The results show that the hydration process could be divided into five stages, inclding initial stage, induction stage, acceleration stage, retardation stage and stable stage. It has been found that with the increasing of the molar ratio of MgO/MgCl2, the induction stage and acceleration stage extended, and heat release ratio and total heat of 3 days were reduced. With the increasing of the molar ratio of H2O/MgCl2, the induction stage is cut down, acceleration stage is in advance and heat release ratio first rising and then down, and the total heat of 3 days are reduced. It may be concluded that the influence of ratio on the hydration process of MOC is mastered, providing the bases to further improve the properties of magnesium oxychloride cement products.

Experimental Study on Strength Development Pattern of Magnesium Oxychloride Cement Cured in Chloride Solution

2014 ◽  
Vol 1051 ◽  
pp. 678-682
Author(s):  
Jian Wei Yang ◽  
Jin Pi ◽  
Yang Pan ◽  
Xin Huang
Keyword(s):  
Chloride Solution ◽  
Molar Ratio ◽  
Strength Development ◽  
X Ray Diffraction ◽  
Chloride Solutions ◽  
Low Concentrations ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Hydration Characteristics ◽  
Oxychloride Cement

Based on different molar ratio of MgO/MgCl2, H2O/MgCl2, magnesium oxychloride cement (MOC) paste was prepared, and soaked in chloride solutions of different concentration. The compressive strength of different age was measured and the component and microstructure of the hydrate was tested by X-ray diffraction (XRD) and scanning electron microscopy (SEM) to investigate the hydration characteristics of MOC soaked in chloride solutions of different concentration (10%, 20%, saturated, super-saturated). The results showed that the MOC paste specimen could hydrate, harden, develop and keep strength in saturated chloride solution, but the strength can not maintain in chloride solution of low concentrations; it is found that MOC could hydrate, harden, develop and keep strength in particular chloride solution owing to the formation, development and stabilization of 518.

Influence of MgCl2 Solution Concentration on Strength of Magnesium Oxychloride Cement Concrete

2012 ◽  
Vol 450-451 ◽  
pp. 791-795 ◽  
Author(s):  
Hong Xia Qiao ◽  
Yao Liu ◽  
Ming Ru Zhou ◽  
Hong Fa Yu ◽  
Jian Feng
Keyword(s):  
Solution Concentration ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Cement Concrete ◽  
X Ray ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Mgcl2 Solution ◽  
Scanning Electron ◽  
Oxychloride Cement

The molar ratio of MgO and MgCl2 affects prominently on the strength of Magnesium Oxychloride Cement Concrete. Different ratios were used to explore the optimum mixture proportion with the highest uniaxial compressive strength. The influence of the MgCl2 solution concentration is presented. XRD (X-ray diffraction) and SEM (scanning electron microscope) was used to analyze the micro-mechanism.

Recent Development of Magnesium-Based Cements - Magnesium Phosphate Cement and Magnesium Oxychloride Cement

2010 ◽  
Vol 69 ◽  
pp. 21-30 ◽  
Author(s):  
Zong Jin Li ◽  
Fei Qiao ◽  
Chung Kong Chau
Keyword(s):  
High Strength ◽  
Cementitious Materials ◽  
Patch Repair ◽  
Magnesium Phosphate ◽  
Strength Development ◽  
Volume Stability ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
And Performance ◽  
Oxychloride Cement

The recent development of two types of environmental friendly cementitious materials, magnesium oxychloride cement and magnesium phosphate cement, at HKUST are presented. Both of them can develop high strength without heat treatment under elevated temperature, i.e. the bonding of these cementitious materials can be achieved at low temperature through chemical reaction, as opposed to fusion or sintering at high temperature. The preparation process of the two cements can not only save a lot of energy but also emit no carbon dioxide. For magnesium oxychloride cement, our research includes parametric study of the formulation, strength development, water resistance, and also identification of phase composition in the cement paste. Magnesium phosphate cement is mainly applied as rapid repair material in civil engineering. In this paper, the formulation, mechanical properties and performance in patch repair of mortar specimen including strength, bond ability to old concrete substrate, volume stability are studied.

scholarly journals Magnesium Oxychloride Cement Composites with MWCNT for the Construction Applications

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 484
Author(s):  
Michal Lojka ◽  
Anna-Marie Lauermannová ◽  
David Sedmidubský ◽  
Milena Pavlíková ◽  
Martina Záleská ◽  
...  
Keyword(s):  
Structural Parameters ◽  
Mechanical Resistance ◽  
Cement Composites ◽  
Multi Walled Carbon Nanotubes ◽  
The Subject ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Phase And Chemical Composition ◽  
Walled Carbon Nanotubes ◽  
Oxychloride Cement

In this contribution, composite materials based on magnesium oxychloride cement (MOC) with multi-walled carbon nanotubes (MWCNTs) used as an additive were prepared and characterized. The prepared composites contained 0.5 and 1 wt.% of MWCNTs, and these samples were compared with the pure MOC Phase 5 reference. The composites were characterized using a broad spectrum of analytical methods to determine the phase and chemical composition, morphology, and thermal behavior. In addition, the basic structural parameters, pore size distribution, mechanical strength, stiffness, and hygrothermal performance of the composites, aged 14 days, were also the subject of investigation. The MWCNT-doped composites showed high compactness, increased mechanical resistance, stiffness, and water resistance, which is crucial for their application in the construction industry and their future use in the design and development of alternative building products.

Study on corrosion and anticorrosion of rebar in magnesium oxychloride cement concrete

2019 ◽  
Vol 8 (1) ◽  
pp. 94-104 ◽  
Author(s):  
Wei Gong ◽  
Hongfa Yu ◽  
Haiyan Ma ◽  
Hongxia Qiao ◽  
Guangfeng Chen
Keyword(s):  
Cement Concrete ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Oxychloride Cement
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