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Title:

Effects of Base Course Restraint on Early Age Transverse Cracking in CRCP

Accession Number:

01552174

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Asphalt Interlayer (AIL) is planned to be placed between a concrete slab and base course in continuously reinforced concrete pavement (CRCP) in a super express highway in Japan. In this study, the effects of AIL are investigated based on observations on a test CRCP and simulations of three dimensional finite element method (3DFEM). The test pavement has two sections with and without AIL and strains and temperatures in the slab were measured. Investigation of the test pavement revealed that air temperature at the time of concrete casting affected the strains in the slab and crack pattern. Also, three closely spaced cracks were observed in the AIL section. To examine how AIL affects cracking situations, numerical simulations were conducted using a 3DFE model that was developed in this study. The model employs an incremental algorithm to consider variations of free contraction strain (FCS) and material properties of concrete at the early age. Mechanical interaction between steel and concrete was modeled with three nonlinear springs. The model was validated by simulating early age cracking of the slab and comparing the predicted cracking with the observed one on the test pavement. Effects of AIL on spacing and width of transverse crack were investigated with the model. The simulations of the 3DFE model revealed that the crack spacing does not change by using AIL, while AIL narrows the crack width. It was found that a small peak in tensile stress on the top of the slab near the crack appears in the AIL section. The peak of tensile stress might cause “secondary” crack near “primary” crack. The peak disappears after the secondary crack occurs near the primary crack, resulting in a cluster cracking observed in the test pavement.

Supplemental Notes:

This paper was sponsored by TRB committee AFD50 Rigid Pavement Design.

Monograph Accession #:

01550057

Report/Paper Numbers:

15-5318

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Nishizawa, Tatsuo
Kazato, Yoshitaka
Motomatsu, Shiro
Taketsu, Hitomi

Pagination:

17p

Publication Date:

2015

Conference:

Transportation Research Board 94th Annual Meeting

Location: Washington DC, United States
Date: 2015-1-11 to 2015-1-15
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Geographic Terms:

Japan

Subject Areas:

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces

Source Data:

Transportation Research Board Annual Meeting 2015 Paper #15-5318

Files:

TRIS, TRB, ATRI

Created Date:

Dec 30 2014 1:47PM