Civil Engineering Department

CE 501

Fall Semester 2003-04 (031)

Homework # 3

Question (1):

Chemical admixtures are used to improve concrete properties. Explain the major reasons for using such admixtures.

Question (2):

When superplasticizers admixture shall be used?

Question (3):

Water exists in hydrated cement paste in different forms, explain the effect of each on shrinkage of the hcp.

Question (4):

Explain the effect of cement and water content on shrinkage of cement paste.

Question (5):

Explain the characteristics of the transition zone.

Question (6):

Explain the effect w/c on the pore size distribution on hydrated cement.

Question (7):

What are the factors affecting the adhesion force between the hydration products and the aggregate particles (Van der Waals force).