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AECT250-Lecture 21

AECT250-Lecture 21 - Lecture 21 Reinforced Concrete...

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Lecture 21 - Page 1 of 8 Lecture 21 – Reinforced Concrete Properties Reinforced concrete structures are typified by their strength, beauty, bulk and longevity. It is the material of choice for many structures where these characteristics are required. Concrete-framed structures have many desirable advantages over other construction materials including: Concrete can be “molded” to form almost any imaginable shape The entire building can be made of concrete – walls, floors, structure Concrete frames are inherently stable (vs. steel & wood) Concrete structures are heavy – excellent for wind-prone areas Concrete is a readily-available material Concrete is very fire-resistant Weather-resistant (if built properly) Relatively inexpensive material However, reinforced concrete structures have several shortcomings which may preclude it as a building material, including: Very labor-intensive Quality control Formwork Longer construction schedule due to curing time Much larger, heavier member sizes (vs. steel-framed) Poor insulation values
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Lecture 21 - Page 2 of 8 Concrete Materials: Concrete is a mixture of the following materials: 1. Portland Cement – The active ingredient that “glues” the other materials together, conforming to ASTM C 150-99a. The raw materials used in portland cement consist mainly of limestone, and clays & shales. Different types of Portland cement include: a) Type I – General purpose b) Type II – Moderate sulfate protection and lower heat of hydration c) Type III – High-early strength d) Type IV – Low heat of hydration used for massive concrete structures such as dams e) Type V – High sulfate resistance 2. Water – Water is necessary to create the chemical reaction of hardening the cement called “hydration.” It should be clean and free from any impurities (i.e., potable). 3. Aggregates
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AECT250-Lecture 21 - Lecture 21 Reinforced Concrete...

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