scholarly journals Water-to-Cement Ratio of Magnesium Oxychloride Cement Foam Concrete with Caustic Dolomite Powder

2021 ◽  
Vol 13 (5) ◽  
pp. 2429
Author(s):  
Weixin Zheng ◽  
Xueying Xiao ◽  
Jing Wen ◽  
Chenggong Chang ◽  
Shengxia An ◽  
...  
Keyword(s):  
Magnesium Chloride ◽  
Chloride Solution ◽  
Salt Lake ◽  
Foam Concrete ◽  
Magnesium Chloride Solution ◽  
Cement Ratio ◽  
Water To Cement Ratio ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Oxychloride Cement

Magnesium oxychloride cement (MOC) foam concrete (MOCFC) is an air-hardening cementing material formed by mixing magnesium chloride solution (MgCl2) and light-burned magnesia (i.e., active MgO). In application, adding caustic dolomite powder into light-burned magnesite powder can reduce the MOCFC production cost. The brine content of MOC changes with the incorporation of caustic dolomite powder. This study investigated the relationship between the mass percent concentration and the Baumé degree of a magnesium chloride solution after bischofite (MgCl2·6H2O) from a salt lake was dissolved in water. The proportional relationship between the amount of water in brine and bischofite, and the functional formula for the water-to-cement ratio (W/C) of MOC mixed with caustic dolomite powder were deduced. The functional relationship was verified as feasible for preparing MOC through the experiment.

scholarly journals Preparation of Low-Cost Magnesium Oxychloride Cement Using Magnesium Residue Byproducts from the Production of Lithium Carbonate from Salt Lakes

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3899
Author(s):  
Pan Liu ◽  
Jinmei Dong ◽  
Chenggong Chang ◽  
Weixin Zheng ◽  
Xiuquan Liu ◽  
...  
Keyword(s):  
Magnesium Chloride ◽  
Chloride Solution ◽  
Low Cost ◽  
Setting Time ◽  
Raw Material ◽  
Salt Lakes ◽  
Magnesium Chloride Solution ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Oxychloride Cement

Magnesium oxychloride cement (abbreviated as MOC) was prepared using magnesium residue obtained from Li2CO3 extraction from salt lakes as raw material instead of light magnesium oxide. The properties of magnesium residue calcined at different temperatures were researched by XRD, SEM, LSPA, and SNAA. The preparation of MOC specimens with magnesium residue at different calcination temperatures (from 500 °C to 800 °C) and magnesium chloride solutions with different Baume degrees (24 Baume and 28 Baume) were studied. Compression strength tests were conducted at different curing ages from 3 d to 28 d. The hydration products, microstructure, and porosity of the specimens were analyzed by XRD, SEM, and MIP, respectively. The experimental results showed that magnesium residue’s properties, the BET surface gradually decreased and the crystal size increased with increasing calcination temperature, resulting in a longer setting time of MOC cement. Additionally, the experiment also indicated that magnesium chloride solution with a high Baume makes the MOC cement have higher strength. The MOC specimens prepared by magnesium residue at 800 °C and magnesium chloride solution Baume 28 exhibited a compressive of 123.3 MPa at 28 d, which met the mechanical property requirement of MOC materials. At the same time, magnesium oxychloride cement can be an effective alternative to Portland cement-based materials. In addition, it can reduce environmental pollution and improve the environmental impact of the construction industry, which is of great significance for sustainable development.

Experimental Study of Mix Proportion of Magnesium Oxychloride Cement

2012 ◽  
Vol 188 ◽  
pp. 183-188 ◽  
Author(s):  
Zhan Hong Qiu ◽  
Jin Rong Feng ◽  
Lei Xiao ◽  
Zhi Yong Zeng
Keyword(s):  
Magnesium Oxide ◽  
Magnesium Chloride ◽  
Bending Strength ◽  
Influence Factor ◽  
Immersion Test ◽  
Magnesium Chloride Solution ◽  
Two Factors ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Oxychloride Cement

Based on the results of compression and bending tests of fifty eight magnesium oxychloride cement test cubes, the influences of two factors on compression and bending strength have been analyzed which includes the mole ratio of magnesium oxide and magnesium chloride and Baum degree of magnesium chloride solution. Softening coefficient of magnesium oxychloride cement and its influence factor have been studied by immersion test of twelve test cubes. The results show when the mole ratio of magnesium oxide and magnesium chloride is 7.0, the strength and water resistance performance of magnesium oxychloride cement is best. This work is very important to the application and dissemination of magnesium oxychloride cement bearing structural member in southern wetter areas of china.

Extrusion of MOC-Based Panel

2008 ◽  
Vol 400-402 ◽  
pp. 263-267
Author(s):  
Xiang Yu Li ◽  
Hui Su Chen ◽  
Chung Kong Chau ◽  
Zong Jin Li
Keyword(s):  
Mechanical Properties ◽  
Cross Sections ◽  
Chloride Solution ◽  
Extrusion Process ◽  
Wood Composites ◽  
Magnesium Chloride Solution ◽  
Wood Particles ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Extrusion Technology

Magnesium Oxychloride Cement (MOC) is an air-hardened material with chemical reaction between magnesium oxide and magnesium chloride solution. It has many properties superior to Portland cement. It does not need wet curing, has very good fire resistance, low thermal conductivity. In this study, wood composites were developed by using MOC as binder and wood powders as filler. It was demonstrated that MOC was suitable for binding wood particles in large quantities. In order to ensure smooth extrusion process, additives and rheological modifiers were used to modify the rheology behaviors and properties of the mixture and the rheology behaviors of fresh materials were also investigated with upsetting and relaxation tests simultaneously. Then MOC-based panels with different cross-sections were produced by using extrusion technology and mechanical properties of them were investigated.

Leaching and Detecting Free Magnesium Chloride for Magnesium Oxychloride Cement

2011 ◽  
Vol 328-330 ◽  
pp. 1347-1350 ◽  
Author(s):  
Ying Li ◽  
Hong Fa Yu
Keyword(s):  
Solvent Extraction ◽  
Magnesium Chloride ◽  
Absolute Ethyl Alcohol ◽  
Influence Of Temperature ◽  
Solid Ratio ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Key Indicators ◽  
Free Magnesium ◽  
Oxychloride Cement

The content of free MgCl2 is one of the key indicators of deliquescence, dehalogenation and efflorescence for Magnesium Oxychloride Cement (MOC). A range of possible techniques for assessing the free MgCl2 content of MOC have been investigated. The techniques are based on mixing powdered samples with absolute ethyl alcohol and measuring the amount of MgCl2 passing into solution. The influence of temperature of solvent, extraction time, fineness, agitation and liquid to solid ratio (L/S) are discussed. The results of recovery tests ranged 96.37% or above. The method is successfully applied to leaching and detecting free MgCl2 in commercial magnesium oxychloride cement fireproof board.

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.

scholarly journals Magnesium Oxychloride Cement Composites Lightened with Granulated Scrap Tires and Expanded Glass

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4828 ◽  
Author(s):  
Milena Pavlíková ◽  
Adam Pivák ◽  
Martina Záleská ◽  
Ondřej Jankovský ◽  
Pavel Reiterman ◽  
...  
Keyword(s):  
Resistance Coefficient ◽  
Added Value ◽  
Silica Sand ◽  
Low Carbon ◽  
Magnesium Chloride Solution ◽  
Scrap Tires ◽  
Filling Materials ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Oxychloride Cement

In this paper, light burned magnesia dispersed in the magnesium chloride solution was used for the manufacturing of magnesium oxychloride cement-based composites which were lightened by granulated scrap tires and expanded glass. In a reference composite, silica sand was used only as filler. In the lightened materials, granulated shredded tires were used as 100%, 90%, 80%, and 70% silica sand volumetric replacement. The rest was compensated by the addition of expanded glass granules. The filling materials were characterized by particle size distribution, specific density, dry powder density, and thermal properties that were analyzed for both loose and compacted aggregates. For the hardened air-cured samples, macrostructural parameters, mechanical properties, and hygric and thermal parameters were investigated. Specific attention was paid to the penetration of water and water-damage, which were considered as crucial durability parameters. Therefore, the compressive strength of samples retained after immersion for 24 h in water was tested and the water resistance coefficient was assessed. The use of processed waste rubber and expanded glass granulate enabled the development of lightweight materials with sufficient mechanical strength and stiffness, low permeability for water, enhanced thermal insulation properties, and durability in contact with water. These properties make the produced composites an interesting alternative to Portland cement-based materials. Moreover, the use of low-carbon binder and waste tires can be considered as an eco-efficient added value of these products which could improve the environmental impact of the construction industry.

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