Coarse Aggregate Gradations for P.C. Concrete, MLR-94-8, 1995

(1995) Coarse Aggregate Gradations for P.C. Concrete, MLR-94-8, 1995. Transportation, Department of

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Abstract

The effect of coarse aggregate gradation and cement content on strength of concrete was studied. Concrete made of Iowa Department of Transportation Standard Mix C-3 and Aggregate Gradation No. 3 were selected as reference. C-3 proportions were used for mixes #1 and #2. C-3 mix with 10% reduction of the cement content was used for mix #3. C-3 mix with 20% reduction of the cement content was used for mix #4. On the other hand, mix #1 used coarse aggregate of Gradation No. 3, while mixes #2, #3, and #4 used coarse aggregate mix of 65% concrete stone and 35% 3/8 in. chips. It was found that strengths of portland cement concrete decrease with decreasing cement factor. On the other hand, 35% of chip replacement for coarse aggregate increases strengths of concrete. By replacing 35% of coarse aggregate with chips, one could reduce cement factor 10% and achieve equivalent strengths.

Item Type: Departmental Report
Keywords: Aggregate gradation, Cement content, Coarse aggregates, Concrete, Portland cement concrete, Strength of materials
Subjects: Transportation
Transportation > Materials
Transportation > Materials > Gravel and aggregates
Transportation > Roads and highways
Transportation > Research
Transportation > Research > Concrete
ID Code: 16757
Deposited By: Iowa DOT Library
Deposited On: 02 May 2014 11:38
Last Modified: 07 Jan 2015 21:16
URI: http://publications.iowa.gov/id/eprint/16757