Preetham Granites are largest manufacturers, suppliers and exporters of INDIAN GRANITES, especially, Black Galaxy Granite, Absolute Black Granite, Black Forest Granite, Black Pearl Granite, Stel Grey Granite, Viscont White Granite, Imperial White Granite, Colonial White Granite, Asian Top Granite, Shiva Gold Granite, Dindigul pink Granite, Ghibli Pink Granite, Ghibli Grey Granite, Paradiso Granite, Tan Brown Granite,Red Multi Granite, Columbu Juparana Granite, Colonial Gold Granite, Imperial Gold granite slabs and countertops. These  granite slabs and countertops are mainly exported to USA, Europe, Canada and Australia.

Cracks in Building – Sulphates Attack

Preetham Granite M.D addressed the gathering of engineers (Association of Madurai Civil Engineers) on Cracks in Buildings – Causes & Remedies at Hotel Weshtern Park ( 01.09.2016).

Sulphate attack

Soluble sulphates present in soil, ground water or clay bricks react with tricalcium aluminate of cement in the presence of moisture and form products which are bulky  and much bigger volume.

This expansive reaction results in weakening of masonry and concrete

General measures for avoidance of sulphate attack :

In case of structural concrete in foundation if sulphate content in soil exceeds 0.2 percent or in ground water exceeds 300ppm use very dense concrete and either increase richness of mix to 1:1:1/2:3 or use sulphate resisting of Portland cement super – sulphate cement or adopt a combination of the two methods depending upon  the sulphate content of  the soil . Similarly  in case of mortar  for masonry increase the richness of mix (1:1/2:4 ½: or 1:1:1/4:3, cement; lime : sand or use special cement as mentioned above or adopt a combination of the two methods.