Influence of magnesium sulphate concentration on durability of concrete containing micro-silica, slag and limestone powder using durability index

Mostofinejad, Davood; Nosouhian, Farzaneh; Nazari-Monfared, Hamed

doi:10.1016/j.conbuildmat.2016.04.091

Cited by 47 publications

(20 citation statements)

References 29 publications

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“…For the offshore structures, the concrete corrosions were observed generally no later than 20 years [6][7][8][9]. The damages caused by the concrete corrosion have greatly impeded the local economy development of those areas, and thus the demand for the structural repair and the other anti-corrosion measures are increasing [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Long-term durability testing on the MgO-activated slag cured in brine

Yang

Huang

2017

Construction and Building Materials

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The corrosion of the concrete in the brine environment has been a challenging issue over years. CaO-activated slag was reported to have an improved anti-corrosion property over the ordinary Portland cement, but its shrinkage cracking remained a problem. MgO-activated slag had lower shrinkage and greater potential of improved corrosion resistance. However, its long-term behavior in the brine environment was still unknown. This paper presents an experimental testing on the durability of the MgO-activated slag paste when cured in the brine. Cube samples were prepared and cured in four single salt solutions and three mixed double-salt solutions. Each single salt solution contained one of the four chemicals of NaCl, Na 2 SO 4 , MgCl 2 , MgSO 4. The mixed double-salt solutions were "NaCl + Na 2 SO 4 ", "NaCl + MgCl 2 ", "Na 2 SO 4 + MgSO 4 ", with various molar ratios. The compressive strength of the MgO-activated slag samples cured in the different solutions was tested at different ages up to 365 days. The experimental results indicated that the MgO-activated slag could hardly sustain the strength after 150 days when cured in the brine solutions. It seemed that SO 4 2-> Cland Mg 2+ > Na + in terms of the corrosion damage to the MgO-slag paste. As indicated by the

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Section: Introductionmentioning

confidence: 99%

Long-term durability testing on the MgO-activated slag cured in brine

Yang

Huang

2017

Construction and Building Materials

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“…In studies on ordinary Portland cement, Na 2 SO 4 and magnesium sulfate (MgSO 4 , hereinafter denoted as MS) have been mainly used for sulfate immersion experiments [13]; these sulfates have been studied as important factors causing the deterioration of ordinary Portland cement. Meanwhile, degradation studies by sulfate immersion experiments have also been conducted on AASC [9,14], but some sulfates have also been used as activators in AASC.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Magnesium-Sulfate as Slag Activator

Kang

Kim

2020

Materials

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This study is about the mechanical and microstructural properties of alkali-activated slag (AAS) paste using magnesium sulfate (MS) as an activator. MS is 2%, 4%, 6%, 8% and 10% contents of binder weight and water-binder ratio is 0.35. Compressive strength, X-ray diffraction, mercury-intrusion porosimetry, and thermal analysis were performed for analysis. The MS contents at which the maximum compressive strength appeared varied according to the measurement age. Hydration products affecting compressive strength and pore structure were ettringite and gypsum. As a result, the changes of ettringite and gypsum depending on the contents of MS have a great influence on the pore structure, which causes the change of compressive strength. The high MS contents increases the amount of gypsum in the hydration products, and the excess gypsum causes high expansion, which increases the diameter and amount of pores, thereby reducing the compressive strength.

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“…Up to now, the effects of magnesium sulfate on ordinary concrete have been studied extensively, and there are a lot of investigations conducted into these effects [7][8][9][10][11]. The study on the impact of fly ash on the sulfate resistance properties by Sumer [8] has indicated that the addition of fly ash can significantly increase the resistance to magnesium sulfate attack.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the use of fly ash is conducive to resisting the magnesium sulfate attack into concrete, because the microstructure of concrete becomes more compact due to the pozzolanic reaction [12]. Mostofinejad et al [10] have carried out a research on the influence of magnesium sulfate concentration on durability of concrete. The results suggested that the 5% magnesium sulfate solution is considered to be the most deteriorating environment from the compressive strength reduction viewpoint, while the 14.7% magnesium sulfate solution is observed as the most severe environment from expansion aspect.…”

Section: Introductionmentioning

confidence: 99%

“…Harbec et al [16] have carried out an investigation on mechanical and durability properties of HPC, and the findings demonstrated that the pozzolanic reaction of glass fume contributes to controlling the expansion of HPC due to sulfate attack. In addition, it has been testified that the deterioration of concrete under sulfate attack is affected by many parameters, such as sulfate concentration [10], water to binder ratio [17,18], participant cation [3,[19][20][21], temperature [22], pH [23], and even specimen's size [24].…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Mechanical Properties and Damage of High Performance Concrete Subjected to Magnesium Sulfate Environment

Cang

Bao

2017

Advances in Materials Science and Engineering

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Sulfate attack is one of the most important problems affecting concrete structures, especially magnesium sulfate attack. This paper presents an investigation on the mechanical properties and damage evolution of high performance concrete (HPC) with different contents of fly ash exposure to magnesium sulfate environment. The microstructure, porosity, mass loss, dimensional variation, compressive strength, and splitting tensile strength of HPC were investigated at various erosion times up to 392 days. The ultrasonic pulse velocity (UPV) propagation in HPC at different erosion time was determined by using ultrasonic testing technique. A relationship between damage and UPV of HPC was derived according to damage mechanics, and a correlation between the damage of HPC and erosion time was obtained eventually. The results indicated that (1) the average increasing amplitude of porosity for HPCs was 34.01% before and after exposure to magnesium sulfate solution; (2) the damage evolution of HPCs under sulfate attack could be described by an exponential fitting; (3) HPC containing 20% fly ash had the strongest resistance to magnesium sulfate attack.

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Influence of magnesium sulphate concentration on durability of concrete containing micro-silica, slag and limestone powder using durability index

Cited by 47 publications

References 29 publications

Long-term durability testing on the MgO-activated slag cured in brine

Long-term durability testing on the MgO-activated slag cured in brine

Investigation of the Effects of Magnesium-Sulfate as Slag Activator

Assessment of Mechanical Properties and Damage of High Performance Concrete Subjected to Magnesium Sulfate Environment

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