CE3420: Quiz II - March 25, 2011 45 marks

Name: (Yl N V vi KOJ)

For questions 1-15, each answer given 2 marks if it is right and-1 mark if it is wrong. Give these answers in the question paper itself.

Class notes provided a list of major cement manufacturers in India. List two of them .

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2. What are the four major corpponents of Portland cement clinker? [Names and cement chemistry notations] . ~ ~ C ~ ,

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3 ......... Below is a figure showing the evolution of cement hydration products. reaction products on the curves in the figure itself.

Porosity

28 90 ----v------..... o 5 30126 ~ ___ ........_---,J~ Age: rv1inutes , Hours Days

4. Write the overall hydration reaction of Portland cement. What are the hydration products that contribute to the strength of concrete and alkalinity of concrete pore solu.tion.

Overall hydration reaction - -4 14

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CE3420: Quiz II - March 25, 2011 45 marks

5. Wha t is the hexagonal plate like crystals shown in the microstructure of hydrated cement below?

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6 . What is the saturated, surface dry condition of the aggregates? Why is it import ant?

7. List three critical factors that can promote alkali-aggregate reactions in concrete.

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8. Match the following (use arrows)

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Air-entraine~ Lignosulphonate

Plasticizer Sulphonated naphthalene formaldehyde

Corrosion inhibito Vinsol resin 'yJ Superplasticizer Calcium nitri {~

16. Discuss the mechanisms of water-reducing admixtures in concrete? Use diagrams, if necessary. What admixtures would you recommend for ready-mix concrete in Chennai in summer?

.J.-7 . Briefly describe the steps in the manufacturing of cement clinkers? What are the processes/reactions inside the kiln .

..rB. Describe anyone test method for the fresh properties of SCC, including the equipment needed, procedure followed, parameters obtained and the significance.

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