Effect of temperature and type of sand on the magnesium sulphate attack in sulphate resisting Portland cement mortars

External Sulphate Attack on sulphate-resisting Portland cement concretes is a well-researched field. However, the effect of temperature on the performance of sulphate attack requires further attention. For this purpose, cubic mortars were made with sulphate resisting Portland cement (low C 3 A) and...

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Bibliographic Details
Published in:Journal of adhesion science and technology 2018-02, Vol.32 (3), p.272-290
Main Authors: AZIEZ, M. N., Bezzar, A.
Format: Article
Language:English
Subjects:
Cement
Compressive strength
ettringite
High temperature
Limestone
Magnesium
magnesium sulphate attack
Mechanical properties
Mortars (material)
Porosity
Portland cements
Sand
Silicon dioxide
sulphate resisting Portland cement
Temperature
Temperature effects
Thaumasite
Tricalcium aluminum ferrite
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Summary:External Sulphate Attack on sulphate-resisting Portland cement concretes is a well-researched field. However, the effect of temperature on the performance of sulphate attack requires further attention. For this purpose, cubic mortars were made with sulphate resisting Portland cement (low C 3 A) and two types of sand, silica and limestone, which were then immersed in a 5% MgSO 4 solution at different temperatures: 5, 20 and 50 °C, for 24 months. The deterioration of mortars due to magnesium sulphate attack was evaluated by measuring changes in mass, compressive strength, porosity and sorptivity. The X-ray diffraction was also used to determine the different mineral phases, and the pH of the conservation solutions was monitored. No damage was observed on the samples exposed at 50 °C. However, serious damage was noted on mortars made with silica sand exposed at 5 °C. Results show that high temperature improved some physical and mechanical properties and do not necessarily accelerate the degradation due to magnesium sulphate attack. Sulphate-resisting Portland cements with limited C 3 A content was found to be susceptible to Thaumasite Sulphate Attack. The type of sand has a remarkable effect on the performance of mortars at low temperature compared to high temperature. The samples with limestone sand showed better resistance against magnesium sulphate attacks.
ISSN:0169-4243
1568-5616
DOI:10.1080/01694243.2017.1353398