Environmental and Load Effect on Dowelled and Undowelled Portland Cement Concrete Slab | Perpustakaan Direktorat Bina Teknik Jalan dan Jembatan

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Environmental and Load Effect on Dowelled and Undowelled Portland Cement Concrete Slab

S.M. Sargand - Nama Orang; I Khoury - Nama Orang;

Two Portland Cement Concrete (PCC) slabs, one dowelled and one undowelled, were placed and instrumented in the Accelerated Pavement Load Test Facility in Lancaster, Ohio. The objectives of the study were to determine the forces generated in steel dowel bars and in the surrounding concrete resulting from PCC slab deformations during curing, thermal cycling, and moving wheel loads; monitor PCC slab shape during curing and thermal cycling with LVDTs and a Dipstick®; measure strain generated in the PCC slabs from moving wheel roads traversing the slab; and determine the magnitude of residual stress remaining in the slabs by taking cores at the rosette locations at the conclusion of testing. The slabs were cured at a constant temperature, and then subjected to temperature variations and wheel loads. Data were collected from the sensors and a Dipstick® was used to measure the shape of the slabs as they cured and when subjected to temperature gradients. It was found that slab temperature gradients were moderate during the curing period because of constant room temperature. LVDT data indicated that the amount of warping on undowelled slabs was much greater than on the dowelled slabs. As slab temperature gradients changed, the undowelled section had greater deflection than the dowelled section. Corner deflection increased with time during the period of constant temperature. Dowels restrained joint movement, thus reducing the amount of curling. Therefore, dowel bars not only transferred load but also reduced loss of support.

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Judul Seri: Advances in Pavement Design through Full-scale Accelerated Pavement Testing (R)
No. Panggil: -
Penerbit: London : ., 2012
Deskripsi Fisik: -
Bahasa: English
ISBN/ISSN: 978-0-415-62138-0
Klasifikasi: NONE
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