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Field experience with concrete exposed to sulphates has often shown that concrete can suffer from surface scaling above the ground level caused by physical sulphate attack. This type of attack has been ignored and, in some instances, confused with chemical sulphate attack. In addition, current standards that evaluate the
temperature in a saturated atmosphere. According to the second mechanism ISA is based on a chain of three essential events (microcracking, late sulfate release, and exposure to water) and DEF could occur even at room temperature. Keywords: Concrete, sulphate attack, ettringite, delayed ettringite formation.
16 Jul 2016 Solution of the sulfates of various bases including sodium, potassium, magnesium and calcium react with hydrated cement paste forming gypsum or a compound called ettringite (sulphoaluminate) which leads to the expansion and disruption of the concrete and mortar this process is referred as sulphate
Combined attack simulates concrete deterioration in marine environments more realistically. However, several factors influence concrete resistance against chlorides and sulphates: cement type and C3A-content, additions, age, temperature, etc. To examine these influences concrete mixtures containing ordinary Portland
On Apr 1, 2007, Jan Tragardh (and others) published the chapter: Sulphate attack in the book: Durability of self-compacting concrete.
QCL Group Technical Note. Page 1. Sulphate Attack and Chloride Ion Penetration: Their Role in Concrete Durability. March 99. SULPHATE ATTACK AND. CHLORIDE ION PENETRATION: THEIR ROLE IN CONCRETE. DURABILITY. Concrete durability continues to be a subject of controversy among design professionals,
Fly Ash Increases Resistance to Sulphate Attack. August 95. FLY ASH INCREASES. RESISTANCE TO. SULPHATE ATTACK. Soluble sulphates which exist in soils, ground waters and sewage waste corrode and eventually destroy Portland cement concrete unless it is designed with fly ash to maximise sulphate resistance.
the explanations put forward to explain sulfate attack, both from a chemical and microstructural perspective. sulfate on cement paste, and therefore concrete. sulphate attack. Cement and Concrete Research 27(4): 1179–. 1189. Kohler S, Heinz D and Urbonas L (2006) Effect of ettringite on thaumasite formation.
A b s t r a c t. Consideration of the concrete durability should take into account sulphate attack which may be significantly various. The destruction of concrete under sulphate attack is particularly related to expansion, however, the dissolution of cement matrix may by considerable. The way of destruction is dependent on the
Sulphate attack on concrete has the potential to cause serious damage or structural failures. Structures in potentially aggressive environments must be designed to recognise the risk of sulphate attack, and speci?c precautions taken in the design process to manage that risk. The use of ?y ash is well documented as a sound.

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February 2018