Experimental investigation on the properties and microstructure of magnesium oxychloride cement prepared with caustic magnesite and dolomite

Liu, Zhuangzhuang; Wang, Shuai; Huang, Jian; Wei, Zhenhua; Guan, Bowen; Fang, Jianhong

doi:10.1016/j.conbuildmat.2015.01.056

Cited by 52 publications

(33 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In literature, there are studies that report on improving the poor water resistance of MOC cement. Authors investigated the use of additives as soluble phosphates [18], fly ash [11,17,19,20], rice husk ash with addition of phosphoric acid, calcium lignosulfonate, and acrylic emulsion [21], the phosphoric acid [22,23], silica fudehume [19], and glass powder [21]. The evaluation of the MOC cement composites water-resistance is to date done only by the compressive strength measurement before and after the immersion in water.…”

mentioning

confidence: 99%

Influence of Waste Plastic Aggregate and Water-Repellent Additive on the Properties of Lightweight Magnesium Oxychloride Cement Composite

et al. 2019

View full text Add to dashboard Cite

Featured Application: The results obtained in the paper can find use in the design and development of low-energy and low-carbon construction composites with the incorporation of waste expanded polypropylene. The developed "green materials" possess good thermal insulation function, minimum water absorption, sufficient permeability for water vapor, and resistance against the harmful water action. The mechanical strength of the lightened composites is acceptable for non-bearing purposes but if required, it can be further improved to meet the technical requirements of construction practice. Abstract:The aim of the present study is to improve the thermal and hygric performance of magnesium oxychloride (MOC) cement composites by the incorporation of waste plastic-based aggregate and the use of the inner and surface hydrophobic agents. The crushed waste expanded polypropylene particles were used as a full replacement of natural silica sand. The aggregate properties were evaluated in terms of their physical and thermal parameters. The caustic calcined magnesite was studied by SEM, XRF, and XRD spectroscopy. The MOC cement composites were characterized by SEM/EDS, XRD, and FT-IR spectroscopy and measurement of their structural properties, strength parameters, thermal conductivity, and volumetric heat capacity. Assessment of water-and water vapor transport properties was also conducted. The results show significantly improved thermal parameters of MOC cement composite containing expanded polypropylene (EPP) as aggregate and indicate high efficiency of surface hydrophobic agent (impregnation) as a barrier against the transport of liquid and gaseous moisture. The resulting lightweight EPP-MOC cement composite with improved thermal insulation function and suitable mechanical properties can be used to produce thermal insulation floors, ceilings, or wall panels reducing the operational energy demand of buildings. volume of CO 2 emissions can be attributed to building industry, whether related to construction materials production or energy needed for heating and cooling of insufficiently insulated buildings [1,2]. For example production of Portland cement (PC) contributes to circa 5-7% of the global CO 2 emissions [3,4].At present, there are efforts to find an alternative to PC that would have a low carbon footprint. One of the candidates may be cements based on the magnesium oxide (MgO). Magnesium oxychloride cement (also known as Sorel cement) is formed by the reaction of a light-burnt MgO powder with a solution of magnesium chloride (MgCl 2 ) [5], where the light-burnt (also called caustic c) MgO is produced by calcination of magnesite (MgCO 3 ) at a temperature of circa 750 • C [6]. This lower temperature, compared to~1450 • C used in the production of Portland clinker, allows the use of alternative fuels [3]. MOC cement-based composites are able to absorb high amount of CO 2 from the atmosphere during their service life to form carbonates and hydroxycarbonates, which leads to their denser microstructure and to higher streng...

show abstract

mentioning

confidence: 99%

Influence of Waste Plastic Aggregate and Water-Repellent Additive on the Properties of Lightweight Magnesium Oxychloride Cement Composite

et al. 2019

View full text Add to dashboard Cite

show abstract

“…As shown in Figure 1, Ba' is very close to Ba. The Baumé degree usually involved in the practical application of MOC is between 20 and 30 °Be' [11,15,23]. Although there are large fluctuations below C = 6 % (for example, |Δ 4 | = 1.6), the two curves above 6 % have a very high coincidence Table 2.…”

Section: The Derived Equationsmentioning

confidence: 99%

Application of a New Computational Method to Calculate the Mixture Composition of Magnesium Oxychloride Cement

Zheng¹

2019

Ceramics - Silikaty

View full text Add to dashboard Cite

Magnesium oxychloride cement (MOC) is a kind of pneumatic and hard cementitious material made by mixing magnesium oxide, magnesium chloride and water in certain proportions. The mixture proportion of the magnesium oxychloride cement materials is relatively complicated in a practical application. In this paper, through a physical property experiment on industrial bischofite in tap water, the constant difference of the mass percentage concentration and the Baumé degree of MgCl 2 were studied. The traditional design method was modified and a new simplified method of magnesium oxychloride cement material mixture was established. In order to verify the applicability of the new method, two kinds of MOC foam concretes have been prepared according to the proportions of the raw materials calculated by the traditional and new method, respectively. The performances of the two were analysed carefully, and the results exhibit that the two kinds of samples have similar mechanical properties and microstructures. It is indicated that the simplified process can be applied to the magnesium oxychloride cement material mixture and has important practical significance for the industrial production of magnesium oxychloride cement materials.

show abstract

“…Pressed pellets of dolomite develop calcite at both exterior surfaces and in the interior, where calcite develops as a secondary phase but is not morphologically well-formed crystals. Liu et al [99] Experimental investigation on the properties and microstructure of magnesium oxychloride cement prepared with caustic magnesite and dolomite…”

Section: Study Of Mineral Composition Microstructure Thermal Expansmentioning

confidence: 99%

Review on the elaboration and characterization of ceramics refractories based on magnesite and dolomite

Sadik

Moudden

Bouari

et al. 2016

Journal of Asian Ceramic Societies

View full text Add to dashboard Cite

One of the most important elements of furnaces, boilers and other heating units is the structure (lining), usually made of silica-alumina, basic or special refractories. The basic refractories are materials that are increasingly in demand and whose manufacturing involves necessarily the use of MgO and CaO. In this article, the description and characterization of magnesite (MgCO 3) and dolomite (Mg,Ca(CO 3) 2) and their contribution in industrial ceramics-refractories have been reviewed.

show abstract

Experimental investigation on the properties and microstructure of magnesium oxychloride cement prepared with caustic magnesite and dolomite

Cited by 52 publications

References 15 publications

Influence of Waste Plastic Aggregate and Water-Repellent Additive on the Properties of Lightweight Magnesium Oxychloride Cement Composite

Influence of Waste Plastic Aggregate and Water-Repellent Additive on the Properties of Lightweight Magnesium Oxychloride Cement Composite

Application of a New Computational Method to Calculate the Mixture Composition of Magnesium Oxychloride Cement

Review on the elaboration and characterization of ceramics refractories based on magnesite and dolomite

Contact Info

Product

Resources

About