Extra%20Notes%20Chapter%207%20Portland%20Cement%20Concrete%281%29

Extra%20Notes%20Chapter%207%20Portland%20Cement%20Concrete%281%29

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Unformatted text preview: American University of Sharjah College of Engineering College of Engineering Department of Civil Engineering CVE221: Construction Materials & Quality Control Chapter 7 Portland Cement Concrete Dr Adil K A Tamim Dr. Adil K. Al-Tamimi / Associate Professor of Civil Engineering 1 Dr. Adil K. Al-Tamimi Associate Professor of Civil Engineering Chapter 7 Outcomes are: You will Learn: 1. Design mix proportions of concrete materials Using ACI method 2. Calculate the yield of concrete mixes according ACI method 3. Apply basic statistics to predict target mean strength Dr. Adil K. Al-Tamimi / Associate Professor of Civil Engineering 2 mean strength 4. Analyze the results of concrete mix design in term of strength and workability Concrete Advantages: 1. Cheapest and most readily available materials 2. It can be formed into complicated shapes & sizes on the construction site 3 Low energy consumption for production Dr. Adil K. Al-Tamimi / Associate Professor of Civil Engineering 3 3. Low energy consumption for production 4. High temperature resistance Concrete Disadvantages : 1. Very brittle, bulky and heavy 2. Low in tensile strength 3. Form work is needed 4. Labor intense and time consuming for Dr. Adil K. Al-Tamimi / Associate Professor of Civil Engineering 4 strength to develop Concrete Compositions Portland cement Fine aggregate Coarse aggregate Air Water Dr. Adil K. Al-Tamimi / Associate Professor of Civil Engineering 5 Admixtures Concrete Design Four variables to achieve the desired strength: • Water/cement ratio • Cement/aggregate ratio • Size of coarse aggregate • Ratio of coarse and fine aggregate Dr. Adil K. Al-Tamimi / Associate Professor of Civil Engineering 6 • Types of cement • Admixtures Concrete Design Procedures Guide-line is available from ACI ACI-211.1 “recommendation Practice for Selecting Proportions for Normal and Heavy Weight Concrete. Dr. Adil K. Al-Tamimi / Associate Professor of Civil Engineering 7 ACI-211.2 for light weight concrete Tests on Fresh Concrete 1. Slump test (ASTM C143) 5 sec to pull up 12” cone, and from pulling the cone to the end of the test without interruption is 2.5 minutes. (Figure 7 3) Shown on the Next Slide Dr. Adil K. Al-Tamimi / Associate Professor of Civil Engineering 8 (Figure 7.3) Shown on the Next Slide Dr. Adil K. Al-Tamimi / Associate Professor of Civil Engineering 9 12” S h s = slump h = measured height True Slump Shear Slump Collapse slump True slump – consists of a general subsidence of the mass without any breaking up. Dr. Adil K. Al-Tamimi / Associate Professor of Civil Engineering 10 Shear slump – indicates a lack of cohesion occurs in harsh mixtures. The mixture is unsuitable to be used....
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Extra%20Notes%20Chapter%207%20Portland%20Cement%20Concrete%281%29

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