01122030

Component

This study evaluated the properties of two high performance concrete paving projects in Richmond and Lynchburg, Virginia. These continuously reinforced concrete pavements were placed on State Route (SR) 288 in Richmond and the Madison Heights Bypass (US 29) in Lynchburg, and each required a minimum flexural strength of 650 psi at 28 days. Although pavement designs are based on flexural strength, compressive strength tests are more convenient and less variable than flexural strength tests. Therefore, a correlation was established between flexural and compressive strength and acceptance was based on the compressive strength. Reduced shrinkage was sought for crack control through the use of large maximum size and dense grading of aggregates and proper curing. Satisfactory strengths can be obtained at 28 days; however, several batches required more time to reach the specified strength. Use of pozzolans may delay strength development; therefore, a test age longer than 28 days should be considered. Concretes with the lowest water content had the lowest shrinkage, as expected. For desired performance, good construction practices including a level base, correct steel placement, proper consolidation, timely texturing, and effective curing are emphasized. A test section at the beginning of the project was found very helpful and is recommended.

01120148

09-0677

English

14p

2009

Transportation Research Board 88th Annual Meeting

DVD

Figures (4) ; References (8) ; Tables (7)

Compressive strength; Concrete curing; Continuously reinforced concrete pavements; Flexural strength; Pavement design; Portland pozzolan cement; Road construction; Shrinkage

Lynchburg (Virginia); Richmond (Virginia)

Construction; Highways; Materials; Pavements; I52: Construction of Pavements and Surfacings

Transportation Research Board Annual Meeting 2009 Paper #09-0677

TRIS, TRB

Jan 30 2009 4:55PM