The house that we have just bought has got sulphate attack so all the ground floor has expanded, cracked and pushed my walls out. Sulphate attack is a major difficulty which has a local effect on the constructional materials, specially the concrete. Power Floated Concrete. The most widespread reported failures to concrete floor slabs involve the use of partially burnt colliery shale (Red Shale). Design Sulfate Class (DS Class) - It is a site classification based on the determined sulfate (including Potential sulfate) contents of the ground and/or groundwater. Clipping is a handy way to collect important slides you want to go back to later. Sulfate attack can be 'external' or 'internal'. If the floor slab becomes damp then a sulphate attack can occur. Sulphates present in contaminated hardcore, together with a source of moisture it reacts with the cement in the concrete causing it to expand and crack. Sulfate attack in cement, mortar and concrete. Sulfate attack in concrete and mortar. I have been told that i need to dig out the concrete and the demolition rubble it sits on my approx 450mm. Next. Now customize the name of a clipboard to store your clips. Our recommended procedure is: Remove the concrete floor slab. A sulphate attack occurs when the infill material beneath the slab contains sulphates and these are taken up into solution by ground moisture, which then migrates into the concrete which forms the floor slab. Over 35 years of concrete flooring and finishing experience. A full removal provides complete assurance of future stability and caters for any uncertainty as to the sulfate attack mechanism that may remain after site investigation. But it may be argued if sulphate attack inherent in the slab when laid the membrane is a red herring. I have just been to view a house that is cash only buyers due to it being diagnosed with sulphur attack in the concrete slab floors. Areas of heavy mining, created colliery shale, which often contains sulphate, which can lead to the problematic “sulphate attack”. Sulphur attack concrete floor. Provides a clean heavy duty Industrial wearing surface. Another serious problem is sulphate attack on ground floor concrete slabs. Sulfates, chemicals and high acidity can cause expansion, cracking and damage to concrete. Moisture can carry the sulphates through the concrete slab, causing them to evaporate at the surface, leaving behind salts. The primary causes of chemical attack on concrete include chloride ion penetration, sulphate attack and carbonation, but technical advances in cementitious coating technology have allowed extended service life solutions to be implemented. Discussion in 'Building' started by Credulous999, 23 Nov 2009. A sulphate attack occurs when hardcore that contains sulphates was used for a the base of concrete floor slabs in a building. Sulphate Attacks; Concrete Contractors; Concrete Experts. The problem occurs when the fill material (hardcore) beneath the slab contains sulphates and these migrate into the concrete. It occurs when concrete comes in contact with water containing sulfates (SO 4 ). Sulfate attack is a common form of concrete deterioration. Providing top quality concrete flooring inside or out. I'd be surprised if it was a concrete floor with no DPM that was then suffering sulphate attack. In the immediate post-war period, when construction materials were in short supply, solid floors, comprising a concrete floor slab over fill material, largely superseded suspended timber floors that were typically used in the 1930s. 3 posts • Page 1 of 1. by kevpeak » Mon Jul 09, 2007 10:07 am . This is where it became common to use what is termed “red ash”. Mapei Mapegrout T60 is a single component, sulphate-resistant, fibre-reinforced, shrinkage compensated, thixotropic mortar for the repair of concrete and reinforced structures. 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