AGGREGATES - Materials for Civil and Construction Engineers - page 200

5.31 Three aggregates are blended by weight in the following percentages:

50% Crushed limestone Bulk dry Sp. Gr. = 2.702

30% Blast furnace slag Bulk dry Sp. Gr. = 2.331

20% Natural sand Bulk dry Sp. Gr. = 2.609

What is the bulk specific gravity of the blended aggregates?
5.32 What is alkali-silica reactivity? What kind of problems are caused
by ASR? Mention two ways to minimize ASR.
5.33 What are the typical deleterious substances in aggregates that affect
portland cement concrete? Discuss these effects.

5.1 References

Arizona Department of Transportation. Standard Specifications for Roads
and Bridge Construction. Phoenix, AZ: Arizona Department of Trans-
portation, 2000.
The Asphalt Institute. Mix Design Methods for Asphalt Concrete and Other
Hot-Mix Types. 6th ed. Manual Series No. 2 (MS-2). Lexington, KY:
The Asphalt Institute, 1995.
Barksdale, R. D., ed. Aggregate Handbook. Washington, DC: National Stone
Association, 1991.
Federal Highway Administration. Asphalt Concrete Mix Design and Field
Control. Technical Advisory T 5040.27. Washington, DC: Federal High-
way Administration, 1988.
Goetz, W. H. and L. E. Wood. Bituminous Materials and Mixtures. Highway
Engineering Handbook, Section 18. New York: McGraw-Hill, 1960.
Kosmatka, S. H., B. Kerkhoff, and W. C. Panarese. Design and Control of
Concrete Mixtures. 14th ed. Skokie, IL: Portland Cement Association,
2002.
McGennis, R. B., et al. Background of Superpave Asphalt Mixture Design
and Analysis. Publication no. FHWA-SA-95-003. Washington, DC: Fed-
eral Highway Administration, 1995.
Meininger, R. C. and F. P. Nichols. Highway Materials Engineering, Aggre-
gates and Unbound Bases. Publication no. FHWA-HI-90-007, NHI
Course No. 13123. Washington, DC: Federal Highway Administration,
1990.