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cement in the mixture will determine the strength; usually at a cure time of 28 days to measure strength in psi (pounds per square inch). While most concrete is a minimum of 3000 psi strength, some may run as high as 14,500 psi for specialty applications. Some applications may require reinforced concrete that incorporates steel mesh or re-bar set in the forms before pouring.
A basic guideline is the rule of 6: * At least 6 bags of Portland cement per cubic yard. * No more than 6 gallons of water per cubic yard. * A minimum of 6 days curing time, while keeping concrete moist by misting several times each day. * When concrete will be subjected to freezing and thawing, an air content of 6% is necessary. * For most applications such as concrete steps, sidewalks, floors, driveways, etc, mix using this 6 part ratio; 1 part Portland cement, 2 parts sand, 3 parts gravel or crushed rock. In addition to accurate mixing, properly pouring concrete involves several aspects: screeding (leveling), vibrating (eliminating voids in the slab), troweling (finishing the surface), and jointing (adding expansion joints for large slabs to expand and contract without breaking or cracking). Consider a Professional my building, for uilder online, Best Builder, My London builder, my London decorator, my Home project, my First home, The next-generation system that Vangent is building, EFAST 2, will save the government money by reducing manual operations and speeding delivery of the data to the various agencies, Curtis said. my Second home, my first decorators, my Martin home, my Builder in Britain, abc for builders, my home project, it's first home, our second home, uk decorators, uk home builder, the builder, Builder board, GB-uk builders, Build home, how to builders, If this all sounds more complicated than what you are willing to undertake, consider enlisting the services of a reliable concrete masonry contractor or concrete construction contractor for the job. 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