The hydration mechanism and performance of Modified magnesium oxysulfate cement by tartaric acid

Wu, Chengyou; Chen, Wenhai; Zhang, Huifang; Yu, Hongfa; Zhang, Wuyu; Jiang, Ningshan; Liu, Lianxin

doi:10.1016/j.conbuildmat.2017.03.222

Cited by 165 publications

(50 citation statements)

References 22 publications

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“…The observation shows that the M-S-H was less crystalline as observed and when this becomes more crystalline then the strength gain is reduced [24]. The process of increasing the Mg(OH) 2 and other magnesium hydration products improve the mechanical strength and specimen's microstructure as it is observed [21]. The addition of UFNSP has induced the magnesium based hydration products, and the results were little bit contrary to earlier studies [12,13].…”

Section: Microstructure and Elemental Mapping On 56 Days' Hardened Spcontrasting

confidence: 55%

“…The concrete attains its strength through the UFNSP; the reason behind this is the presence of Mg and reduced particle size of UFNSP, which facilitates the intrusion of particle in cement matrix [11][12][13][14]. The higher hydration rate is the main cause of early age strength attainment [21]. From the result it was clear that the strength attainment can be achieved until 20% replacement.…”

Section: Compressive Strength On Hardened Concrete At Variousmentioning

confidence: 73%

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An Investigation on Self-Compacting Concrete Using Ultrafine Natural Steatite Powder as Replacement to Cement

Kumar¹,

Sudalaimani²,

Shanmugasundaram³

2017

Advances in Materials Science and Engineering

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An experimental investigation was made on flow properties and compressive strength of self-compacting concrete (SCC) with ultrafine natural steatite powder (UFNSP) as replacement to cement. The tests were conducted on specimens with 5%, 10%, 15%, 20%, and 25% of replacement of UFNSP to the weight of cement and compared to the control specimens. The flow properties of all specimens were tested and checked for their limit with the existing guidelines. The compressive strength test was done on all specimens for strength of 7 days, 14 days, 28 days, and 56 days. The hardened samples were tested for their microstructural behavior and the elements Mg, Ca, and Si were mapped. Through mapping, the formations of M-S-H along with C-S-H are observed. The results show that the addition of UFNSP influences the flow property, by reducing the flow, and increases the compressive strength till 20% replacement. Further the addition of UFNSP increases the denseness of microstructure of the specimens thus resulting in the strength increment.

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Section: Microstructure and Elemental Mapping On 56 Days' Hardened Spcontrasting

confidence: 55%

Section: Compressive Strength On Hardened Concrete At Variousmentioning

confidence: 73%

An Investigation on Self-Compacting Concrete Using Ultrafine Natural Steatite Powder as Replacement to Cement

Kumar¹,

Sudalaimani²,

Shanmugasundaram³

2017

Advances in Materials Science and Engineering

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“…In our previous study, not the 3•1•8 phase, but Mg(OH) 2 was found in the hydrated MOS cement with the mole ratio of active MgO to MgSO 4 being more than 3. In recent years, many researchers have shown that the use of additives such as citric acid (CA) (Wu et al 2014;Wang et al 2018 ), tartaric acid (Wu et al 2017), phosphoric acid ( Wu et al 2015( Wu et al , 2016, and their acid salts can improve the strength of MOS cement. By controlling the process of hydration of active MgO in magnesium sulfate solution, the addition of additives, such as CA, favored the formation of large amounts of the 5Mg(OH) 2 •MgSO 4 •7H 2 O (5•1•7 phase), which resulted in MOS cements with high strength and high volume stability.…”

Section: Introductionmentioning

confidence: 99%

“…However, all the reported additives that can obviously improve the compression strength of the MOS cement have strong retardation effects, and the higher the additive content, the longer the final setting time. For example (Wu et al 2017), the final setting time of MOS cement with 0%, 0.13%, and 1% of tartaric acid are 2 hours, 6 hours, and 14 hours, respectively. This retardation could result in a lower strength development curve at the early stages such as 12 hours and 1 day, which will seriously reduce the production efficiency of MOS cement products.…”

Section: Introductionmentioning

confidence: 99%

Effects of 5•1•7 Phase Seed Crystal on Performance of Magnesium Oxysulfate Cement

Luo

Zhang

et al. 2019

ACT

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Magnesium oxysulfate (MOS) cement is lightweight, offers fire resistance, and has good aesthetics. Although the addition of citric acid improves the cement's late strength, the concomitant retardation of hydration of MOS by citric acid results in slow setting and low early strength. This may in return decrease the production efficiency of MOS cement products. In this study, 5•1•7 phase (5Mg(OH) 2 •MgSO 4 •7H 2 O) seed crystal (SC) is used as a modifier that works as a seed nucleus and accelerates the hydration of MOS cement in the early stages, in the absence or presence of citric acid. The effect of SC on compressive strength, setting time, and volume change is investigated in detail. X-ray diffraction, scanning electronic microscopy, hydration-heat release rate, and mercury intrusion porosimeter are performed to explain the influence mechanism of SC on the performance of the MOS cement. The results revealed that the in situ formation and growth of the new 5•1•7 phase crystals on the SC surface by the addition of SC can significantly accelerate the setting, improve the 12 h and 28 d compressive strengths, and reduce shrinkage of MOS cement without or with 0.05% citric acid.

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“…Magnesium oxysulfate (MOS) cement is a new kind of magnesia cementitious material which is energy saving, environmentally friendly and air dried. It is also well known because it offers certain advantages, including light weight, high strength, good fire resistance, strong water resistance and steel protection following the addition of additives such as citric and phosphoric acids (Kahle, 1972;Kishimoto and Yamamoto, 2009;Wu et al, 2015Wu et al, , 2017. MOS cement is typically generated by mixing a certain concentration of magnesium sulfate solution with active magnesium oxide (α-MgO) (Runčevski et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Study of using light-burned dolomite ores as raw material to produce magnesium oxysulfate cement

Chen

et al. 2018

Advances in Cement Research

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Magnesium oxysulfate cement (MOS) prepared by light-burned dolomite has excellent performance in terms of light weight, high strength and low carbon dioxide emission. In this research, dolomite ores are used to produce MOS cement at different calcination temperatures and calcination times; the parameters investigated are the rate of loss on ignition, free lime (f-CaO), dihydrate gypsum (CaSO 4 Â2H 2 O) and impact of active magnesium oxide (α-MgO) content exerted on the setting time and compressive strength of the MOS cement. X-ray diffraction analysis, scanning electron microscopy, the time of colour change for citric acid and hydration-heat release rate were adopted to assess the effects of calcination temperature, calcination time and the molar ratio of α-magnesium oxide/magnesium sulfate on the MOS cement. The experimental results showed that the MOS cement prepared by dolomite ores at the calcination temperature of 850°C for 30 min with the α-magnesium oxide/magnesium sulfate molar ratio of 4 demonstrates better mechanical properties than those made in other circumstances. In addition, the main strength phase of MOS cement with tri-sodium citrate dihydrate (Na 3 C 6 H 5 O 7 •2H 2 O) generated by light-burned dolomite ores is the needle-like 5Mg(OH) 2 •MgSO 4 •7H 2 O crystal phase. Notation M MgO molecular weight of magnesium oxide M H2O molecular weight of water m 1 , m 2 mass of magnesium oxide before and after reacting with water for 3 h at a temperature of 105°C, respectively W 1 , W 2 mass of dolomite before and after calcinating, respectively ω(CaO) content of calcium oxide ω(MgO) content of magnesium oxide ΔG gibbs free energy Cite this article Chen Y, Wu C, Yu H et al. (2018) Study of using light-burned dolomite ores as raw material to produce magnesium oxysulfate cement.

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The hydration mechanism and performance of Modified magnesium oxysulfate cement by tartaric acid

Cited by 165 publications

References 22 publications

An Investigation on Self-Compacting Concrete Using Ultrafine Natural Steatite Powder as Replacement to Cement

An Investigation on Self-Compacting Concrete Using Ultrafine Natural Steatite Powder as Replacement to Cement

Effects of 5•1•7 Phase Seed Crystal on Performance of Magnesium Oxysulfate Cement

Study of using light-burned dolomite ores as raw material to produce magnesium oxysulfate cement

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