Improving the performance of reactive MgO cement-based concrete mixes

Dũng, Nguyễn Tiến; Unluer, Cise

doi:10.1016/j.conbuildmat.2016.09.090

Cited by 111 publications

(52 citation statements)

References 35 publications

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“…Among the above, MgO is one of the most excellent expansive agents. It has been widely used because of its stable hydration products, easy regulation of expansion performance, and no shrinkage in the later stage [19,20].…”

Section: Introductionmentioning

confidence: 99%

Influence of Combined Action of Steel Fiber and MgO on Chloride Diffusion Resistance of Concrete

Jiang

Deng

et al. 2020

Crystals

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To improve the chloride diffusion resistance and durability of concrete, a new kind of steel fiber reinforced MgO concrete (SFRMC) was made by adding steel fiber and MgO to concrete simultaneously. With steel fiber for load bearing and expansion limiting, MgO as the expander, SFRMC has both the advantages of fiber reinforced concrete and expansion concrete. The influence of steel fiber and MgO on the strength and chloride diffusion resistance of concrete was evaluated by splitting tensile test and chloride diffusion test. Mercury intrusion porosimeter (MIP) and scanning electron microscopy (SEM) were used to study the microstructure of SFRMC. The results showed that the combined action of steel fiber and MgO reduced the porosity of concrete and the chloride diffusion coefficient (CDC), which could not be achieved by steel fiber and MgO separately. In the free state, the expansion energy produced by the hydration of MgO made the concrete expand outwards. However, under the constraint of steel fiber, the expansion energy was used to tension the fiber, resulting in self-stress. In this way, compared to reference concrete RC, the tensile strength of SFRMC-1, SFRMC-2, and SFRMC-3 increased by 3.1%, 61.3%, and 64.5%, CDC decreased by 8.8%, 36.7%, and 33.1%, and the porosity decreased by 6.2%, 18.4%, and 20.6%, respectively. In addition, the SEM observations demonstrated that the interfacial transition zone (ITZ) between fiber and matrix was denser in SFRMC, which contributed to reduce the diffusion of chloride ions in the concrete.

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Section: Introductionmentioning

confidence: 99%

Influence of Combined Action of Steel Fiber and MgO on Chloride Diffusion Resistance of Concrete

Jiang

Deng

et al. 2020

Crystals

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“…The decomposition of HMCs not only changes the initially dense microstructure but also results in the loss of structural integrity, thereby leading to a reduction in sample performance. previous studies (Dung & Unluer, 2016, 2017c.…”

Section: Designmentioning

confidence: 58%

“…Previous studies on carbonated MgO formulations have reported its hydration and carbonation mechanisms (Dung & Unluer, 2016 and have attempted to improve these via the use of different mix designs Mo & Panesar, 2012;Ruan & Unluer, 2017a), additives Ruan & Unluer, 2017b;) and curing conditions Unluer & Al-Tabbaa, 2014;. Studies performed on the use of reactive MgO as a binder in concrete mixes have shown its capacity to fully carbonate under accelerated carbonation conditions, during which the CO2 concentration is raised from ambient (0.04%) to accelerated (5-20%) levels to increase the rate of the carbonation reaction (Unluer & Al-Tabbaa, 2013.…”

Section: Degree Of Hydrationmentioning

confidence: 99%

Improving the strength and microstructure of reactive magnesia based concrete blocks

Pu¹

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“…Reject brine is a main material used in this study, a comparison on element difference in reject brine with previous study [17] [35]was shown in Some researches revealed the morphology of HMCs played an important role in strength [41]. HMCs have a lot of morphology, such as needle-like fibrous and roselike, those structures affect or lock each other and then lead to high strength, in some case the transfer from brucite would increase the volume and stiffness, lower the porosity.…”

Section: Resultsmentioning

confidence: 80%

Investigation of mechanical properties and associated microstructure of reactive magnesia cement synthesized from reject brine

Sun¹

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Acknowledgements vi Acronyms vii List of Figures viii List of Tables ix Chapter 1 Introduction 9 1.1. Background 9 1.2. Objectives and Scope 1.3 Organization of Report Chapter 2 Literature Review 11 2.1 Introduction 11 2.2 Previous study on recovery reactive MgO from reject brine 11 2.2.1 Desalination plants and reject brine from Singapore 11 2.2.2 Background of synthetic MgO 2.2.3 Several methods that recover brucite from seawater or brine 2.3 Previous study on MgO cement 2.3.1 The relationships between traditional cement and greenhouse effect 2.3.2 Different sources of MgO 2.3.3 The methodology of using MgO as a concrete binder 2.3.4 Key factors that influence the carbonation and hydration of RMC 2.4 Conclusion Chapter 3 Production Scale-up of MgO Cement Synthesized from Reject Brine 18 3.5. Results and discussion 3.5.1. Differences on the raw materials-reject brine 3.

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Improving the performance of reactive MgO cement-based concrete mixes

Cited by 111 publications

References 35 publications

Influence of Combined Action of Steel Fiber and MgO on Chloride Diffusion Resistance of Concrete

Influence of Combined Action of Steel Fiber and MgO on Chloride Diffusion Resistance of Concrete

Improving the strength and microstructure of reactive magnesia based concrete blocks

Investigation of mechanical properties and associated microstructure of reactive magnesia cement synthesized from reject brine

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