Influence of blast-furnace slag on behaviour of dolomite used as a raw material of MgO-type expansive agent

Temiz, Hüseyin; Kantarcı, Fatih; İnceer, M. Emin

doi:10.1016/j.conbuildmat.2015.07.059

Cited by 24 publications

(8 citation statements)

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“…Comparing Figures 3 and 4, it can be found that the increased strength grade results in the improvement of limited and free compressive strengths. ment of the compressive strength due to the reaction of calcium hydroxide with fly ash and slag powder, which makes the concrete more dense [18,19]. Comparing Figures 3 and 4, it can be found that the increased strength grade results in the improvement of limited and free compressive strengths.…”

Section: Compressive Strengthmentioning

confidence: 96%

“…This is attributed to the fact that an appropriate amount of expansive agent (lower than 9%) can improve the compactness of cement-based materials [16,17]. Additionally, the increasing dosage of mineral admixtures can decrease the compressive strength of concrete at an early age (less than 28 days) and at the curing age of 56 days the addition of mineral admixtures results in the improvement of the compressive strength due to the reaction of calcium hydroxide with fly ash and slag powder, which makes the concrete more dense [18,19]. Comparing Figures 3 and 4, it can be found that the increased strength grade results in the improvement of limited and free compressive strengths.…”

Section: Compressive Strengthmentioning

confidence: 99%

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Effect of Assembly Unit of Expansive Agents on the Mechanical Performance and Durability of Cement-Based Materials

et al. 2021

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This paper studies the influence of assembly unit of expansive agents (CaO and calcium sulphoaluminate) on the limited and free compressive strengths, the limited expansion rate, carbonation resistance, chloride ion penetration resistance and corrosion resistance of reinforcement concrete. The dosages of expansive agent were 0%, 3%, 6%, 9%, and 12% by the total amount of cementitious materials. Two kinds of mineral admixture (blast furnace slag and fly ash) were applied in this study. Results show that suitable dosage (lower than or equal to 9%) of double expansion agent with a large amount of mineral admixtures can improve the limited and free compressive strengths. However, when the dosage of the double expansion agent is higher than 9%, the addition of the double expansion agent leads to the reduction of limited and free compressive strengths. The variation of the limit expansion rate reaches the maximum value when the curing age is 14 days. The increasing addition of expansive agents and lower water-binder ratio demonstrate positive effect on the limited expansion rate. Concrete with 60% mineral admixtures (fly ash and ground granulated blast furnace slag) shows lower limited expansion rate and higher compressive strength than the concrete with 50% mineral admixtures. Finally, the incorporation of double expansion agent can improve the resistance to carbonation, chloride ion penetration resistance, anti-corrosion of steel bars and mechanical strengths (the limited and free compressive strengths).

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Section: Compressive Strengthmentioning

confidence: 96%

Section: Compressive Strengthmentioning

confidence: 99%

Effect of Assembly Unit of Expansive Agents on the Mechanical Performance and Durability of Cement-Based Materials

et al. 2021

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“…Temiz et al [111] Influence of blast-furnace slag on behavior of dolomite used as a raw material of MgO-type expansive agent…”

Section: Study Of Mineral Composition Microstructure Thermal Expansmentioning

confidence: 99%

Review on the elaboration and characterization of ceramics refractories based on magnesite and dolomite

Sadik

Moudden

Bouari

et al. 2016

Journal of Asian Ceramic Societies

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One of the most important elements of furnaces, boilers and other heating units is the structure (lining), usually made of silica-alumina, basic or special refractories. The basic refractories are materials that are increasingly in demand and whose manufacturing involves necessarily the use of MgO and CaO. In this article, the description and characterization of magnesite (MgCO 3) and dolomite (Mg,Ca(CO 3) 2) and their contribution in industrial ceramics-refractories have been reviewed.

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“…Much higher curing and service temperature and pressure, coupled with more stringent technical requirements such as avoidance of micro-annuli and good bonding strength at cementing interfaces lays the prominent distinguishments of applying the cementitious materials downhole from the civil construction above the ground. Enlightened by the hydration expansion property of magnesia (Thomas J. et al, 2014;Mo et al, 2015;Ye et al, 2015;Temiz et al, 2015;Sherir et al, 2016;Jafariesfad et al, 2016;Qureshi et al, 2016;Sherir et al, 2017;Cao et al, 2018b,a;Srivastava et al, 2018;José et al, 2020;Li et al, 2010;Mo and Al-Tabbaa, 2020) and successful bulk shrinkage prevention case of Baishan dam construction (Mo et al, 2014), incorporating magnesia into Portland cement to address/mitigate its shrinkage issue arouses people's interest rather than simply categorizing magnesia as the detrimental role for the unsoundness of Portland cement application.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Magnesia Blended Cement Studies for Geotechnical Well Construction—A Review

et al. 2021

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The current paper presents a literature review on the studies of incorporation of magnesia (magnesium oxide) into Portland cement material from the geotechnical well construction perspective. Starting with a comparison of application conditions between civil construction and geotechnical well cementing, this work reviewed the Portland cement categorizations, magnesia manufacturing routes at first. Then, the physical-chemical-mechanical properties were investigated which includes the reactivity of magnesia, expansion influence from its hydration, and carbonation/dehydroxylation of magnesia blended Portland cement. The development of cement material hydration modeling methods is also summarized. Moreover, the experimental characterization methods have also been elucidated including composition determination, particle size analysis, volumetric variation measurement, compressive strength testing, shear-bond strength testing, transition state analysis, etc. Meanwhile, the results and conclusions were extracted from the literature. Through this route, a comprehensive understanding of the scientific research progress on magnesia blended Portland cement development for geotechnical well construction is derived. Additionally, it is concluded that incorporating magnesia into Portland cement can provide benefits for this material utilization in geotechnical well constructions provided the reasonable tuning among the characteristics of magnesia, the downhole surrounding conditions, and the formulation of the cement slurry. Satisfying these pre-conditions, the effective expansion not only mitigates the micro-annulus issues but also increases the shear bonding strength at the cementing interfaces. Moreover, the caustic magnesia introduction into Portland cement has the potential advantage on carbon dioxide geological sequestration well integrity compared with the Portland cement sheath without it because of the denser in-situ porous matrix evolvement and more stable carbon fixation features of magnesium carbonate. However, since the impact of magnesia on Portland cement strongly depended on its properties (calcination conditions, particle size, reactivity) and the aging conditions (downhole temperature, pressure, contacting medium), it should be noted that some extended research is worth conducting in the future such as the synchronized hydration between magnesia and Portland cement, the dosage limit of caustic magnesia in Portland cement in terms of CO2 sequestration and the corresponding mechanical properties analysis, and the hybrid method (caustic magnesia, Portland cement, and other supplementary cementitious materials) targeting the co-existence of the geothermal environment and the corrosive medium scenario.

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Influence of blast-furnace slag on behaviour of dolomite used as a raw material of MgO-type expansive agent

Cited by 24 publications

References 24 publications

Effect of Assembly Unit of Expansive Agents on the Mechanical Performance and Durability of Cement-Based Materials

Effect of Assembly Unit of Expansive Agents on the Mechanical Performance and Durability of Cement-Based Materials

Review on the elaboration and characterization of ceramics refractories based on magnesite and dolomite

Recent Advances in Magnesia Blended Cement Studies for Geotechnical Well Construction—A Review

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