Effects of calcination condition on expansion property of MgO-type expansive agent used in cement-based materials

Mo, H. J.; Deng, Min; Tang, Mingshu

doi:10.1016/j.cemconres.2009.09.025

Cited by 305 publications

(164 citation statements)

References 13 publications

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“…However, it is known that the characteristics of reactive MgO vary significantly [19], depending on their raw material, calcination conditions and the type of impurities and their content [20,21], which may affect their performance in the activation process. None of the above studies investigated the hydration kinetics of reactive MgO-GGBS paste or the effect of different types of reactive MgO on the hydration process.…”

Section: Introductionmentioning

confidence: 99%

Strength and hydration properties of reactive MgO-activated ground granulated blastfurnace slag paste

Jin

Al‐Tabbaa

2015

Cement and Concrete Composites

260

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a b s t r a c tGround granulated blastfurnace slag (GGBS) is widely used as a partial replacement for Portland cement or as the major component in the alkali-activated cement to give a clinker-free binder. In this study, reactive MgO is investigated as a potentially more practical and greener alternative as a GGBS activator. This paper focuses on of the hydration of GGBS, activated by two commercial reactive MgOs, with contents ranging from 2.5% to 20% up to 90 days. The hydration kinetics and products of MgO-GGBS blends were investigated by selective dissolution, thermogravimetric analysis, X-ray diffraction and scanning electron microscopy techniques. It was found that reactive MgO was more effective than hydrated lime in activating the GGBS based on unconfined compressive strength and the efficiency increased with the reactivity and the content of the MgO. It is hence proposed that reactive MgO has the potential to serve as an effective and economical activator for GGBS.

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Section: Introductionmentioning

confidence: 99%

Strength and hydration properties of reactive MgO-activated ground granulated blastfurnace slag paste

Jin

Al‐Tabbaa

2015

Cement and Concrete Composites

260

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“…As the surface area increases, the quality of caustic calcined magnesite increases. In the study, caustic calcined magnesites with the highest surface area were obtained at 750 o C. [19] tarafından da ortaya konmuĢtur.…”

Section: Determination Of Surface Areas and Porosities Of Caustic Calmentioning

confidence: 99%

Farklı Kalsinasyon Sıcaklıklarında Elde Edilen Kostik Kalsine Manyezitlerin Yüzey Alanlarının ve Porozitelerinin Belirlenmesi

Türkmenoğlu¹,

Kiliç²,

Anil³

et al. 2017

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖzBu çalıĢmada, manyezit cevherinin 650 o C ile 850 o C arasındaki sıcaklıklarda kalsine edilmesi ile elde edilen kostik kalsine manyezitlerin yüzey alanları ve poroziteleri belirlenmiĢtir. Kimyasal analiz sonuçlarına göre, manyezit örneği %97,02 oranında magnezyum karbonattan oluĢmaktadır. Determination of Surface Areas and Porosities of Caustic Calcined Magnesites Obtained at Different Calcination Temperatures AbstractIn this study, surface areas and porosities of caustic calcined magnesites were determined by calcining magnesite ore at temperatures between 650 o C and 850 o C. According to the results of the chemical analysis, the magnesite sample is 97,02% magnesium carbonate. Along with the release of carbon dioxide gas during calcination, the BET surface area of the magnesite ore increased from 2,71 m 2 /g to 70,49 m 2 /g, the Langmuir surface area increased from 3,45 m 2 /g to 91,29 m 2 /g. The total pore volume increased from 5,89 mm 3 /g to 172,70 mm 3 /g with an increase of about 25 times in the surface area. Parameters affecting the quality of caustic calcined magnesite are; The calcination duration and temperature, the chemical purity of the crude ore, and the surface area of the obtained caustic calcined magnesite. As the surface area increases, the quality of caustic calcined magnesite increases. In the study, caustic calcined magnesites with the highest surface area were obtained at 750 o C.

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“…CaO-type and sulfoaluminate-type expansive additives cause mainly early stage expansion; therefore, long-term shrinkage would not be compensated (Mo et al, 2010). Calcium sulfoaluminate requires large quantities of water for its hydration product ettringite to form (Nagataki and Gomi, 1998), otherwise it's reaction is hindered.…”

Section: Expansive Additivesmentioning

confidence: 99%

“…It must be calcined at very high temperatures to create low-reactive MgO. (Mo et al, 2010) The expansion of nanosized MgO particles can through synthesis and heat-treatment processes be controlled more precisely than conventional MgO sources. Therefore, their expansive property can be designed to compensate shrinkage in a wide range of temperatures and at different ages (Jafariesfad et al, 2016).…”

Section: Expansive Additivesmentioning

confidence: 99%

Cement sheath modification using nanomaterials for long-term zonal isolation of oil wells: Review

Jafariesfad

Geiker

Gong

et al. 2017

Journal of Petroleum Science and Engineering

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Well cementing is an important operation during drilling and completion of oil wells. The cement sheath must maintain well integrity behind the casing and provide long-term zonal isolation to ensure safety and prevent environmental problems. Despite recent technological advancement in smart polymeric materials, fibers and self-healing materials, it is still a big challenge to provide adequate long-term zonal isolation in severe oil well conditions. This review provides an overview of challenges faced in oil wells compromising the long-term ability of the cement sheath to provide zonal isolation. Factors controlling the long-term performance of cement sheath are discussed, in terms of shrinkage, tensile strength and flexibility. The use of nanomaterials as cement additive to fabricate flexible, high-tensile strength, and low-shrinkage cement system are reviewed.Introduction of nanomaterials into the cement system is a promising approach to design a sealant for the entire life of the well, thereby avoiding potential remedial costs and environmental impacts.

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Effects of calcination condition on expansion property of MgO-type expansive agent used in cement-based materials

Cited by 305 publications

References 13 publications

Strength and hydration properties of reactive MgO-activated ground granulated blastfurnace slag paste

Strength and hydration properties of reactive MgO-activated ground granulated blastfurnace slag paste

Farklı Kalsinasyon Sıcaklıklarında Elde Edilen Kostik Kalsine Manyezitlerin Yüzey Alanlarının ve Porozitelerinin Belirlenmesi

Cement sheath modification using nanomaterials for long-term zonal isolation of oil wells: Review

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