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.

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.

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 Investigation of magnesium oxychloride cement at the initial hardening stage

2018 ◽  
Vol 143 ◽  
pp. 02012
Author(s):  
Galina Averina ◽  
Tamara Chernykh ◽  
Aleksandr Orlov ◽  
Lyudmila Kramar
Keyword(s):  
Magnesium Oxide ◽  
Magnesium Hydroxide ◽  
Crack Formation ◽  
Source Material ◽  
Oxide Powder ◽  
Pure Magnesium ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Source Materials ◽  
Oxychloride Cement

The paper investigates the process of variation of magnesium oxychloride cement deformations at the initial hardening stage depending on the activity of magnesium oxide powder which is determined by the parameters of the source material burning. Investigation is focused on magnesium cements obtained from pure magnesium hydroxide. Source materials were burnt at various temperatures with the purpose to obtain magnesium oxide powder with different activity. Regular content of hydrated phases was determined in hardened magnesium cement prepared on the basis of binders with different activity. The study reveals the influence of magnesium oxide powder activity on the process of deformation occurrence in hardened magnesium cement and its tendency to crack formation.

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.

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.

scholarly journals Effect of Admixing Fly Ash on Cementing Characteristics of Magnesium Oxychloride Cement

2021 ◽  
Vol 9 (5) ◽  
pp. 248-253
Author(s):  
Rekha Sharma ◽  
R. N. Yadav
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Magnesium Chloride ◽  
Setting Times ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Oxychloride Cement

Investigations pertaining to the effect of admixing different amounts of fly ash on setting characteristics and compressive strength of magnesium oxychloride cement has been carried out in this paper. For this purpose, two different dry mix compositions (1:0 and 1:1) of magnesia and dolomite were prepared and 5 %, 10 %, 15 % and 20 % fly ash were added in dry mixes. The dry mixes were then gauged with 24 °Be concentration of magnesium chloride gauging solution. It was observed that initial and final setting times of cement blocks tend to increase with increasing amount of fly ash in dry mix. MOC cement blocks of 1:1 composition admixed with fly ash displayed good cementing characteristics.

Sign in / Sign up

Export Citation Format

Share Document