Research on autogenous volume deformation of concrete with MgO

Gao, Peiwei; Xu, Sheng; Xiong, Chen; Li, Jun; Lü, Xiaolin

doi:10.1016/j.conbuildmat.2012.11.025

Cited by 58 publications

(21 citation statements)

References 7 publications

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“…is trend was also observed for MA-20, but not for MG-20, which presented significantly higher shrinkage strain. ese findings are in agreement with those of others [19,66] and can be explained by the aforementioned reason that Mg(OH) 2 presents a greater volume than that of its initial reagents. e specimens' expansion, prompted by the MgO particles' rapid reaction (typical of light-burned MgO [67]), occurred 2-3 days after casting.…”

Section: Water Absorption By Capillarysupporting

confidence: 93%

Hydration of Reactive MgO as Partial Cement Replacement and Its Influence on the Macroperformance of Cementitious Mortars

Gonçalves

Silva

Fernández

et al. 2019

Advances in Materials Science and Engineering

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A recent quest for more sustainable cement-based construction materials has triggered the pursuit of technically viable alternatives of cement, making reactive magnesium oxide (MgO) one of the least known top contenders to reduce this sector’s environmental impact since it participates in the cement’s hydration reactions and presents enhanced carbon capture ability during its life cycle. In this study, two different commercially available reactive MgO samples were evaluated as partial cement replacements (at 10%, 15%, and 20%, by weight) in the production of mortars. Thermogravimetric analysis (TGA), energy-dispersive X-ray (EDX) analysis, differential thermal analysis (DTA), and powder X-ray diffraction (XRD) analysis of cement, MgO samples, and resulting mortars were carried out. All specimens were evaluated in terms of their mechanical and durability-related performance (i.e., flexural and compressive strength, carbonation, water absorption by capillary action, and shrinkage). The main results suggest that, in spite of the decreased, albeit acceptable, performance with increasing incorporation of MgO as partial cement replacement, a significant decrease was observed in the shrinkage strain of cementitious materials.

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Section: Water Absorption By Capillarysupporting

confidence: 93%

Hydration of Reactive MgO as Partial Cement Replacement and Its Influence on the Macroperformance of Cementitious Mortars

Gonçalves

Silva

Fernández

et al. 2019

Advances in Materials Science and Engineering

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“…Besides, air‐entraining and SRAs at dosages of 6‐10 mL/kg, as well as gypsum at 6%, were effective in reducing shrinkage of AAS concrete. For the Portland cement system, it has been reported that when MgO is added, the autogenous shrinkage of paste could be totally compensated due to the formation of Mg(OH) 2 to fill the pores and the denser structures . The results of Shen et al showed that addition of 10% light‐burned dolomite (containing >85% reactive MgO) reduced the shrinkage of sodium silicate‐activated slag/fly ash cement by around 50%, and was only slightly higher than that of PC.…”

Section: Introductionmentioning

confidence: 99%

Autogenous and drying shrinkage of alkali‐activated slag mortars

et al. 2019

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Shrinkage of alkali-activated slag (AAS) cement is a critical issue for its industrial application. This study investigated the mechanisms and effectiveness of shrinkagereducing agent (SRA) and magnesia expansive agent on reducing autogenous and drying shrinkage of AAS mortars that were activated by liquid sodium silicate (LSS) solution with modulus (SiO 2 /Na 2 O molar ratio) of 0-1.5. The results showed that the autogenous shrinkage of AAS mortars increased with the increase of LSS modulus from 0 to 0.5, then decreased as modulus increased up to 1.5. The drying shrinkage consistently increased with the increase in the modulus of LSS. The oxyalkylene alcohol-based SRA could significantly reduce the autogenous and drying shrinkage of AAS mortars while the magnesia expensive agent was comparatively less effective.The autogenous shrinkage of AAS mortars was inversely proportional to the internal relative humidity, while the drying shrinkage was more related to the mass loss of samples. Mathematical models were established to describe the autogenous and drying shrinkage behavior of AAS mortars. K E Y W O R D Sadditives, alkali activation, alkali-activated slag, shrinkage 4964 | HU et al.

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“…This study aims to improve the properties of subgrade using Magnesium Oxide (MgO). MgO is used as an improving additive in Portland cement and concrete technology [22][23][24][25][26]. However, no such research was performed in the domain of subgrade improvement using MgO, to the best knowledge of authors, which leaves a remarkable gap in this domain.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Subgrade Properties Using Magnesium Oxide for Pavement Construction

Salem¹,

Taher²,

Mosa³

2018

IJET

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This study aims to use Magnesium Oxide (MgO) as one of the modern additives to improve the properties of subgrade and consequently improve the pavements system structure and durability as well as reducing the cost of construction and maintenance of the constructed pavements. The study adopted California Bearing Ratio (CBR) testing method and cyclic triaxial compression test (this test is used to determine the soil resilient modulus (Mr)) to investigate the influence of MgO on the properties of a selected soil obtained from Baghdad city. Six doses (0.25%, 0.5%, 0.75%, 1%, 1.25%, and 1.5% of the dry weight of soil) of MgO were added to the selected soil to attain the objective of this study. The results exhibited that CBR values increased from 3.39% to (13.59%, 18.45%, 27.54%, 25.24%, 16.99%, and 14.56%) respectively, the Mr values increased from 35 MPa to (83, 97,150, 137, 110 and 103 MPa) respectively and the swelling ratios decreased from 3.4% to (1.51%, 0.80%, 0.61%, 0.66%, 1.18%, and 1.97%) respectively by adding MgO doses, previously, mentioned. Based on these results the optimum MgO dose is (0.75% by the dry weight of soil) as it satisfies the highest CBR and Mr values and the lowest swelling ratio.

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Research on autogenous volume deformation of concrete with MgO

Cited by 58 publications

References 7 publications

Hydration of Reactive MgO as Partial Cement Replacement and Its Influence on the Macroperformance of Cementitious Mortars

Hydration of Reactive MgO as Partial Cement Replacement and Its Influence on the Macroperformance of Cementitious Mortars

Autogenous and drying shrinkage of alkali‐activated slag mortars

Enhancement of Subgrade Properties Using Magnesium Oxide for Pavement Construction

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