Hw 3 - 4833 psi 5. A cement clinker is produced when the...

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CCEV360-04 February 5, 2008 Dillon Gauthier Atkins Ch. 7 #1-7 1. Main materials manufacturing: Lime, silica, alumina, and iron oxide. The cement compounds produced are: C 3 S, C 2 S, C 3 A, and C 4 AF. Tricalcium silicate, C 3 S, is important for early strength. Dicalcium silicate, C 2 S, is good for long-term strength gain. 2. When water is combined with Portland cement, hydration occurs. To satisfy minimal ‘thirst’ 25% water is needed. To attain workability, at least 40% is needed. Hydration is a chemical reaction that produces heat. 3. Type I – normal, common cement. Used most frequently. Type II – moderate sulphate resistance for use with high sulphate aggregate content. Type III – high early strength, for when you need strength gain to occur faster, such as a bridge deck. Produces more heat. 4. 3580 psi @ 28 days 135% strength at 6 months =
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Unformatted text preview: 4833 psi 5. A cement clinker is produced when the compounds are mixed together and placed in a kiln at 2700 ° F and a small pellet is formed, called a clinker. Gypsum is added to the clinkers and then ground up into a fine powder— Portland Cement. 6. The main difference between Type I and Type III cements is that Type III contains more C 3 S, which would increase the strength at a faster rate, but the heat of hydration will also be increased. It also contains less C 2 S, which hydrates the cement slowly. 7. The water/cement ratio is the mass of the water in the mix divided by the mass of the cement. So a 1m 3 batch may contain 190kg of water and 340kg of cement: w/c = 190/340 = 0.56 The higher the w/c ratio, the more water the mix contains—the less strength the batch will have....
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This homework help was uploaded on 04/07/2008 for the course CCEV 360 taught by Professor Lambrechts during the Spring '08 term at Wentworth Institute of Technology.

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