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6505r4 - 6 How many types of water are associated with a...

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CGN 6505 REVIEW QUESTIONS - SET NO. 4 Spring 2010 The Structure of Concrete 1. Describe the effects of the aggregate phase on the properties of concrete. 2. Know how to compute the solids-to-space ratio of a hydrated cement paste for different levels of hydration when the w/c ratio is known. Describe how the strength and the permeability of the hydrated cement paste is related to the solids-to-space ratio of the hcp. 3. Describe the properties of the transition zone in concrete, and how they are different from the properties of the hydrated cement paste. 4. Describe the characteristics of the C-S-H, calcium hydroxide, ettringite and monosulfate hydrated in a Portland cement paste. 5. How many types of voids are present in a hydrated cement paste? What are their typical dimensions? Describe how they may affect the properties of the Portland cement paste.
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Unformatted text preview: 6. How many types of water are associated with a saturated cement paste? Describe how they affect the properties of the Portland cement paste. 7. Explain the following: (A) Why concrete fails at a stress lower than the strength of either the aggregate or the hardened cement paste. (B) Why the aggregate and hcp remain elastic until fracture in uniaxial compression test, whereas concrete shows inelastic behavior. (C) Why concrete fails in a brittle manner in tension, but is relatively tougher in compression. (D) Why the stiffness of concrete is less than either that of the aggregate or the hcp. (E) Why the permeability of concrete is higher than that of the hcp or the aggregate. (F) Why the strength of concrete decreases as the aggregate size increases....
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