Transcription of Concrete - Columbia University
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Concrete - Columbia University
Concrete 1. common cement is Type I. Type III cement is used Concrete if more rapid strength development is required. The A composite material that consists essentially of a other types are characterized by either lower heat binding medium, such as a mixture of portland ce- of hydration or better sulfate resistance than that of ment and water, within which are embedded parti- Type I cement. cles or fragments of aggregate, usually a combination Aggregate. The aggregate is a granular material, such of fine and coarse aggregate. as sand, gravel, crushed stone, or iron-blast furnace Concrete is by far the most versatile and most slag. It is graded by passing it through a set of sieves widely used construction material worldwide. It can with progressively smaller mesh sizes. All material be engineered to satisfy a wide range of performance that passes through sieve #4 [ in.]
Concrete 3 concrete, care should be taken to avoid segregation. For example, if dropped too far, the heavy or big aggregate particles can settle and lighter mix com-
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