01333162

Component

https://doi.org/10.3141/2226-03

http://scholar.google.com...bane&publication_year=2011

In 1978, an experimental two-layer concrete pavement was opened to traffic on SR-45 near Fort Myers, Florida. The experimental pavement included a series of two-layer concrete pavement sections with various design features placed over either a granular or a cement-treated subbase. These sections consisted of a 3-in. (7.5-cm) portland cement concrete (PCC) surface over a 9-in. (23-cm) lean concrete (commonly referred to as econocrete) layer. The control section consisted of a standard PCC 9 in. (23 cm) thick with joints spaced at 20 ft (6 m) on a cement-treated subbase. After 30 years of service, the sections constructed over a granular base performed better than those placed over a cement-treated subbase. The distresses on the two-layer concrete pavement sections built on the granular subbase were minimal, regardless of their slab lengths. In contrast, the control section experienced greater cracking, greater corner deflections, and moderate-to-severe spalling. The findings validate several features of Florida’s current design policies, such as limiting joint spacing to 15 ft and prohibiting cement-treated subbases directly below concrete pavements. Furthermore, this project has demonstrated that a two-layer concrete system consisting of a relatively thin high-quality PCC surface over a lower-quality econocrete layer and a granular subbase can be a sustainable and long-lasting pavement design alternative.

01353811

11-1501

English

pp 21-29

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167369

Print

Figures (7) ; References (19) ; Tables (6)

Concrete pavements; Econocrete; Granular bases; Pavement design; Pavement layers; Pavement performance; Portland cement concrete

Joint spacing; Long term performance; Two-layer concrete pavements

Fort Myers (Florida)

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways

PRP, TRIS, TRB, ATRI

Feb 17 2011 5:49PM

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