Exam (elaborations)
PLACING REINFORCING BARS: KEY CONCEPTS || ALL QUESTIONS ANSWERED CORRECTLY.
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Concrete is a mixture of one part cement, of about 1.5 to 2.5 parts fine aggregate (usually sand) and of about 3 of 5 parts coarse aggregate (such as gravel, crushed stone, or blast-furnace slag), and clean water. By varying the proportions of the mixture, concrete with different crushing strengths...
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