Mechanical properties and rapid chloride permeability of carbonated concrete containing reactive MgO

Zhang, Runxiao; Panesar, Daman K.

doi:10.1016/j.conbuildmat.2018.03.223

Cited by 28 publications

(16 citation statements)

References 24 publications

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“…Figure 8 and Table 4 present the results of the water absorption by capillary action of MA and MG. As expected, there was a slight increase in water absorption with increasing MgO content, though not as obvious for MG10 and MG15. Even though the hydration of MgO may result in the formation of a phase that exhibits higher volume than that of the initial constituents, replacing a part of the cement will directly decrease the amount of C-S-H that is capable of producing a more tortuous and less interconnected porous network [37], especially after carbonation of the specimen [62,64]. However, lower total pore volume and water absorption would likely be observed over time with ensuing carbonation reactions and formation of additional magnesium carbonate hydrates [30,37,65].…”

Section: Water Absorption By Capillarymentioning

confidence: 99%

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 Capillarymentioning

confidence: 99%

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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“…[2], the water demand for the hydration of 100 g r‐MgO and 100 g PC are 39.8 and 20.9 g, respectively, based on the chemical composition of r‐MgO and PC in Table . (b) A higher w/b ratio of r‐MgO‐PC systems results in a greater initial pore volume and greater moisture evaporation during the drying process, compared to mixes with lower w/b ratios . Higher w/b ratios are required for the specimens with high r‐MgO replacement levels to maintain satisfactory flow‐abilities, compared to the specimens with low r‐MgO replacement levels.…”

Section: Resultsmentioning

confidence: 99%

“…(b) A higher w/b ratio of r-MgO-PC systems results in a greater initial pore volume and greater moisture evaporation during the drying process, compared to mixes with lower w/b ratios. 6 Higher w/b ratios are required for the specimens with high r-MgO replacement levels to maintain satisfactory flow-abilities, 17 compared to the specimens with low r-MgO replacement levels. Therefore, the specimens with high r-MgO replacement levels inherently possess more chances of gaseous CO 2 penetration, which largely determines the carbonation rate of mortar or concrete.…”

Section: T a B L E 4 Crystalline Proportion (%)mentioning

confidence: 99%

“…However, the hydration product of r‐MgO is found to make a minimal contribution to the compressive strength of the matrix . Therefore, accelerated carbonation with an elevated CO 2 concentration (>50%) is usually employed as the curing technique for paste, mortar, or concrete containing r‐MgO to enhance the mechanical properties . The design of an r‐MgO‐PC system involves the selection of r‐MgO replacement level, the corresponding water‐to‐binder (w/b) ratio and curing regime.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5] Therefore, accelerated carbonation with an elevated CO 2 concentration (>50%) is usually employed as the curing technique for paste, mortar, or concrete containing r-MgO to enhance the mechanical properties. [6][7][8] The design of an r-MgO-PC system involves the selection of r-MgO replacement level, the corresponding water-to-binder (w/b) ratio and curing regime. A relative humidity greater than 75% and a CO 2 concentration greater than 50% have already been identified to benefit the carbonation degree of an r-MgO-PC system.…”

Section: Introductionmentioning

confidence: 99%

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Design of carbonated r‐MgO‐PC binder system: Effect of r‐MgO replacement level and water‐to‐binder ratio

Zhang

Panesar

2019

J Am Ceram Soc

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This study investigates the influence of reactive MgO (r‐MgO) replacement levels and water‐to‐binder (w/b) ratios on the compressive strength, carbonation front, and pore structure of mortars with r‐MgO and Portland cement (r‐MgO‐PC) as binder. The experimental results reveal that an increase in the w/b ratio decreases the carbonation degree for mortars with 20% r‐MgO, but increases the carbonation degree for mortars with 60% r‐MgO. The r‐MgO replacement level together with the w/b ratio and carbonation degree impacts the type and quantity of the carbonation products, namely Mg‐calcite, nesquehonite and the hydrated amorphous Mg carbonate, which affects the pore structure and compressive strength of the matrix. The maximum strength for mortars with 20% r‐MgO occurs at the lowest w/b ratio (0.45), while the maximum strength for mortars with 60% r‐MgO occurs at the intermediate w/b ratio (0.65). A design of r‐MgO replacement level, w/b ratio in conjunction with the drying and carbonation curing regimes is needed for further advancement and application r‐MgO‐PC system.

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Cellular Structure Formation of Composite Materials

Miryuk

2021

Lecture Notes in Civil Engineering

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Mechanical properties and rapid chloride permeability of carbonated concrete containing reactive MgO

Cited by 28 publications

References 24 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

Design of carbonated r‐MgO‐PC binder system: Effect of r‐MgO replacement level and water‐to‐binder ratio

Cellular Structure Formation of Composite Materials

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