Accelerated carbonation of reactive MgO and Portland cement blends under flowing CO2 gas

Wang, Lei; Chen, Liang; Provis, John L.; Tsang, Daniel C.W.; Poon, Chi Sun

doi:10.1016/j.cemconcomp.2019.103489

Cited by 137 publications

(22 citation statements)

References 35 publications

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“…With the concrete deterioration caused by freeze-thaw damage, the cracks and micro-cracks interconnect [2] , a concrete structure loses its watertigthness, and becomes vulnerable to one or more processes of deterioration. The permeability is implicated in the mechanisms of expansion and cracking, and becomes a risk factor for concrete durability [3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

Effect of steel fiber on the crack permeability evolution and crack surface topography of concrete subjected to freeze-thaw damage

Zeng

Ding

Zhang

et al. 2020

Cement and Concrete Research

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This paper describes the steel fiber effect on the crack permeability and crack surface topography of concrete subjected to freeze-thaw damage. The sequential crack permeability of steel fiber reinforced concrete are investigated by a vacuum permeability set-up. The topographical analysis is applied on the crack surface by an invented 3-D laser scanning equipment. The results show that the crack permeability of concrete is less than the value predicted by the Poiseuille flow model and their difference decreases gradually with the crack widening. With increment of steel fiber dosage and freeze-thaw damage level, the effect of steel fiber on reducing the crack permeability becomes strong. Topographical analysis illustrates that both steel fiber and freeze-thaw damage enhance the roughness of concrete crack surface. The relationship between roughness number of crack surface and material permeability parameter α follows an exponential function, which can be employed to quickly estimate the crack permeability of concrete.

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Section: Introductionmentioning

confidence: 99%

Effect of steel fiber on the crack permeability evolution and crack surface topography of concrete subjected to freeze-thaw damage

Zeng

Ding

Zhang

et al. 2020

Cement and Concrete Research

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“…where the molar mass of MgO is 40 g/mol and that of MgCl 2 is 95 g/mol. By substituting Equations (5) and (6) into Equation 4, the relationship between the m Br and m MO can be obtained:…”

Section: Derivation Of Formula (Df)mentioning

confidence: 99%

“…Magnesium oxychloride cement (MOC) is formed by mixing magnesium chloride solution (MgCl 2 -H 2 O) with magnesium oxide powder (MgO) [1,2]. As an air-dried gel material, MOC is widely used in several fields, including construction, transportation and technology [3][4][5][6]. At room temperature and pressure, the chemical reactions in the MgO-MgCl 2 -H 2 O system are the following:…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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“…Such binders include magnesium oxide cements which, in combination with other materials, may be used as magnesium oxychloride cements, magnesium phosphate cements, magnesium silicate hydrate cements, etc. [1], [7] Magnesite (MgCO3) calcination is mainly used for the production of magnesium oxide to be used as raw materials of magnesium oxide-based cements [8], [9]. As another source of magnesite serves dolomite (CaMg (CO3)2) with larger deposits than magnesite [8], [10].…”

Section: Introductionmentioning

confidence: 99%

Production of Magnesium Binder Composites Using Local Raw Materials and Technogenic Products

Namsone

Šahmenko

Korjakins

2021

ETR

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Building sector is known as one of the biggest polluters, causing environmental pollution and carbon dioxide emissions, most of which are generated during the production process of building materials. Therefore, researchers and manufacturers have become increasingly interested in environmentally friendly materials with low energy consumption. Magnesium based cements are being studied as an alternative to a widespread material as Portland cement, thus reducing the temperature required for calcination. During this research, magnesium binder-based composites using two types of magnesium (local dolomite waste material and caustic magnesia) were produced. Within the framework of this study, several regimes of thermal treatment were used to produce low carbon dioxide and environmentally friendly magnesium binder composites. Physical, mechanical and thermal properties of obtained specimens were tested.

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Accelerated carbonation of reactive MgO and Portland cement blends under flowing CO2 gas

Abstract: This is a repository copy of Accelerated carbonation of reactive MgO and Portland cement blends under flowing CO2 gas.

Cited by 137 publications

References 35 publications

Effect of steel fiber on the crack permeability evolution and crack surface topography of concrete subjected to freeze-thaw damage

Effect of steel fiber on the crack permeability evolution and crack surface topography of concrete subjected to freeze-thaw damage

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

Production of Magnesium Binder Composites Using Local Raw Materials and Technogenic Products

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