Effects of sodium chloride and magnesium sulfate concentration on the durability of cement mortar with and without fly ash

Yıldırım, Korkmaz; Sümer, Mansur

doi:10.1016/j.compositesb.2013.03.040

Cited by 54 publications

(15 citation statements)

References 5 publications

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“…In previous experimental studies, significant losses were observed in the modulus of elasticity, stiffness, compressive and flexural strengths of the structural elements exposed to MgSO 4 effect. As a result of hydration process, the formation of the C-S-H bond structure, which has quite a vital role in the gain of mechanical strength, is reduced by Mg salts and the formation of C-S-H is partially replaced by magnesium-silicate-hydrate (M-S-H) structure which is very fragile and does not have the capability of binding [15]. In order to reduce the negative effect of MgSO 4 on C-S-H structure, low porosity material designs are frequently examined through alternatives such as designs with high cement dosage, low water/binder ratio, and various saltresistant mineral added binders.…”

Section: Effect Of Various Curing Methods and Addition Of Silica Aeromentioning

confidence: 99%

Effect of various curing methods and addition of silica aerogel on mortar properties

Bostancı¹,

Ustundag²,

Sola³

et al. 2019

JCE

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Effect of various curing methods and addition of silica aerogel on mortar properties Mechanical and thermal properties and porosity of aerogel-incorporated mortars exposed to various curing conditions (curing by wetting-drying, curing by magnesium sulphate (MgSO 4), and water curing) are experimentally investigated in this study. Maximum compressive strengths at 0.5 % aerogel content under the effects of wetting-drying and MgSO 4 curing conditions amounted to 60.8 MPa and 44.3 MPa, respectively. In addition, compared to the other curing methods, the gel pores formation in mortars exposed to MgSO 4 effects increased with an increase in aerogel content.

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Section: Effect Of Various Curing Methods and Addition Of Silica Aeromentioning

confidence: 99%

Effect of various curing methods and addition of silica aerogel on mortar properties

Bostancı¹,

Ustundag²,

Sola³

et al. 2019

JCE

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“…The mass variation is a common parameter used in the literature for checking the performance of cement-based materials exposed to aggressive media, such as sulphate attack [49,50]. In this work, the mass variation has been measured until 600 days of exposure to sodium sulphate solution in prisms of dimensions 4 cm × 4 cm × 5.3 cm, which were also used to determine the compressive strength.…”

Section: Methodsmentioning

confidence: 99%

Long-Term Behaviour of Fly Ash and Slag Cement Grouts for Micropiles Exposed to a Sulphate Aggressive Medium

et al. 2017

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Nowadays, one of the most popular ways to get a more sustainable cement industry is using additions as cement replacement. However, there are many civil engineering applications in which the use of sustainable cements is not extended yet, such as special foundations, and particularly micropiles, even though the standards do not restrict the cement type to use. These elements are frequently exposed to the sulphates present in soils. The purpose of this research is to study the effects in the very long-term (until 600 days) of sulphate attack in the microstructure of micropiles grouts, prepared with ordinary Portland cement, fly ash and slag commercial cements, continuing a previous work, in which these effects were studied in the short-term. The microstructure changes have been analysed with the non-destructive impedance spectroscopy technique, mercury intrusion porosimetry and the “Wenner” resistivity test. The mass variation and the compressive strength have also been studied. The impedance spectroscopy has been the most sensitive technique for following the sulphate attack process. Considering the results obtained, micropiles grouts with slag and fly ash, exposed to an aggressive medium with high content of sulphates, have shown good behaviour in the very long-term (600 days) compared to grouts made with OPC.

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“…The results of sulphate attack are generally related to the volume change, cracking and hence the deterioration of concrete. Magnesium sulphate (MgSO 4 ) is responsible for the fastest, most severe attacks on concrete [1]. According to Golop and Taylor [2], magnesium sulphate is more severe than sodium sulphate.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the long-term performance of SCC incorporating different mineral admixtures in a magnesium sulphate environment

Siad

Lachemi

Kamali-Bernard

et al. 2015

Construction and Building Materials

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International audienceThe effects of mineral admixture type on the behaviour of self-consolidating concrete (SCC) in magnesium sulphate environments were investigated over the course of four years of exposure. Three mineral admixtures (limestone filler, fly ash and natural pozzolan) representing a wide range of compositions were used in the study. Twelve formulations covering three strength classes (30, 50 and 70 MPa) and four concrete mixtures were studied. Mass loss with physical deterioration, and dimensional and compressive strength changes due to magnesium sulphate attack were determined through microstructural analysis. The sulphate profiles of sulphur, magnesium, silicon, calcium and aluminium elements were also quantified through analyses of the samples. A complementary analysis by phase assemblages was performed on the degraded layers of concrete specimens. These test results indicate that the mineral admixture type greatly affects the durability performance of SCC under magnesium sulphate exposure. Among the tested mineral admixtures, natural pozzolan showed better long-term durability performance in the magnesium sulphate environment. The interaction between vibrated concrete and SCC is related to the nature of the mineral admixtures

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Effects of sodium chloride and magnesium sulfate concentration on the durability of cement mortar with and without fly ash

Cited by 54 publications

References 5 publications

Effect of various curing methods and addition of silica aerogel on mortar properties

Effect of various curing methods and addition of silica aerogel on mortar properties

Long-Term Behaviour of Fly Ash and Slag Cement Grouts for Micropiles Exposed to a Sulphate Aggressive Medium

Assessment of the long-term performance of SCC incorporating different mineral admixtures in a magnesium sulphate environment

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