How does FMC calculate concrete?
A. Length x Width x Depth (fraction of foot-example 4 in would be 4/12=0.33) Divided by 27. Add 10-15% for spillage/waste and variations in sub-grade. Q. What kinds of cracking occur in concrete surfaces?* A. Concrete, like other construction materials, contracts and expands with changes in moisture content and temperature, and deflects depending on load and support conditions. When provisions for these movements are not made in design and construction, cracks can occur. Some forms of common cracks are: plastic shrink cracking, cracks due to improper jointing, cracks due to continuous external restraint, basement floor cracks, D-cracks from freezing and thawing, craze cracks and settlement cracks. Cracks rarely affect structural integrity. Most random individual cracks look bad and although they permit entrance of water, they do not lead to progressive deterioration. They are simply unsightly. Closely spaced pattern cracks or D-cracks due to freezing and thawing are an exception and ma
