exam - 2. What benefits may be had through the partial...

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Short Answer 1. What temperature is typically reached in the hottest part of the cement kiln? 2. Why is gypsum added to cement? 3. What is a typical Blaine fineness value for Type I cement? 4. Of the 4 principal components of portland cement, which produces the most heat on hydration? The least? 5. What are the products of hydration of C2S and C3S? Which of these products contributes most to strength of the concrete? 6. Name 3 factors which influence the rate of heat evolution during hydration. 7. Give an example of a Class N pozzolanic material, as defined by ASTM C618. 8. How do the molecular structures of air entraining admixtures differ from water-reducing admixtures? Long Answer/Essay 1. What is the “transition zone” in concrete? How does its presence affect strength and durability?
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Unformatted text preview: 2. What benefits may be had through the partial substitution of pozzolanic materials for cement in concrete? Additional ?s I) What are the major differences between in the physical and chemical composition between ASTM Types II and III portland cement? II) Compare the properties of C-S-H and CH and their roles in determining the properties of hardened cement paste. III) What would be the volume of capillary voids in an 0.25 water/cement ratio paste that is 35 percent hydrated? Also calculate the water-cement ratio needed to obtain zero porosity in a fully hydrated cement paste. Assume that the specific gravity of cement is 3.14....
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