Carbonated MgO concrete with improved performance: The influence of temperature and hydration agent on hydration, carbonation and strength gain

Dũng, Nguyễn Tiến; Unluer, Cise

doi:10.1016/j.cemconcomp.2017.06.006

Cited by 146 publications

(74 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

“…Another practical feature of using reactive MgO-based cementitious composites is their ability to capture a considerable amount of CO 2 thereby further decreasing the material's environmental impact throughout its life cycle. Furthermore, the carbonation of brucite may result in phases (i.e., magnesium carbonate hydrates such as nesquehonite, hydromagnesite, dypingite, and artinite) capable of significantly increasing the strength of the matrix [29,30].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

Section: Water Absorption By Capillarymentioning

confidence: 99%

Section: Introductionmentioning

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

View full text Add to dashboard Cite

show abstract

“…as expansive agents in mass construction) (Gao et al, 2008;Mo et al, 2014) since their hydration rate is lower than those of reactive MgO or Portland cement (PC). Alternatively, the use of reactive MgO in cement-based formulations does not create any potential late expansion problems due to its similar hydration rate to PC (Dung and Unluer, 2017a;Dung and Unluer, 2017b).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the properties of MgO recovered from reject brine obtained from desalination plants

Dong

Yang

Unluer

et al. 2018

Journal of Cleaner Production

View full text Add to dashboard Cite

In addition to its use in various applications such as those in the agriculture, pharmaceutical and refractory industries, MgO is being investigated as a cement binder due to the low calcination temperatures used during its production and its ability to gain strength by absorbing CO2 in construction products. Similar to the dry-route, the reactivity of MgO synthesised from waste water or reject brine via the calcination of the precipitated Mg(OH)2 depends on the calcination conditions. This study investigated the influence of two bases, namely ammonia solution (NH4OH) and sodium hydroxide (NaOH), on the properties of Mg(OH)2 precipitated and consequently the characteristics of MgO produced under different calcination conditions. The energy consumption of the production of reactive MgO from reject brine via the addition of NH4OH and NaOH was also reported and compared with the industrial production routes to assess the sustainability of the production procedure. The final products were characterised in terms of their specific surface area (SSA) and microstructure. Results indicated that Mg(OH)2 synthesised via the addition of NH4OH into reject brine generated a more porous, flakelike morphology than those obtained via the use of NaOH. The SSA and reactivity of NH4OH-based MgO demonstrated a sharper decrease with increasing temperature and duration compared to NaOH-based MgO. Out of all samples, NH4OH-based MgO calcined at 500 °C for 2 hours revealed the highest reactivity (SSA of 78.8 m 2 /g), which was higher than NaOH-based MgO (SSA of 51.4 m 2 /g).

show abstract

“…However, because the production of Portland cement will release a large amount of carbon dioxide (0.7–1.0 tons of carbon dioxide per ton of OPC), consume the excessive non-renewable mineral resources (limestone), and require higher calcination temperatures (1450 °C). Traditional Portland cement is leading to severe environmental, energy and resource problems during the production process [2] , [3] , [4] . Therefore, the development of sustainable alternative cementitious materials is an urgent need for sustainable development.…”

Section: Introductionmentioning

confidence: 99%

Properties and microstructure of basic magnesium sulfate cement: Influence of silica fume

Tan

Sun

et al. 2021

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

Carbonated MgO concrete with improved performance: The influence of temperature and hydration agent on hydration, carbonation and strength gain

Cited by 146 publications

References 37 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

Investigation of the properties of MgO recovered from reject brine obtained from desalination plants

Properties and microstructure of basic magnesium sulfate cement: Influence of silica fume

Contact Info

Product

Resources

About