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Guidelines for Paving Adjacent Concrete Lanes Seperately

Gatti, Kerri Alyssa (2011) Guidelines for Paving Adjacent Concrete Lanes Seperately. Master's Thesis, University of Pittsburgh.

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    Abstract

    Often times concrete pavements are constructed by first paving the mainline followed by the shoulder some time later. It is important to factor differences in structure, material properties, and climatic conditions between the mainline and shoulder into the design; otherwise, premature cracking can develop. Cracking can occur in the newly paved lane, the existing lane, or both. The primary objective of this research was to develop guidelines to protect against premature cracking from paving adjacent lanes separately. A review of several case studies revealed that longitudinal shear cracking and transverse cracking in the shoulder are the main distresses associated with delayed shoulder construction. Longitudinal shear cracking occurs due to dissimilar transverse joint openings in the mainline and shoulder. In warm weather, shoulder joints close first causing shear stresses to develop in the mainline. Transverse cracking in the shoulder is caused by thermal incompatibility between the mainline and the shoulder and small shoulder widths (less than 5 ft). The following study uses finite element analysis to analyze the causes of longitudinal shear cracking and transverse cracking in the shoulder. A parametric study was developed for each distress so that guidelines could be established and future occurrences of the distresses can be prevented. Thermal incompatibility between the mainline and the shoulder was the primary factor that caused premature cracking for both distresses. Every effort should be made to prevent the difference of the zero-stress temperatures of the mainline and shoulder from going beyond 20°F.


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    Details

    Item Type: University of Pittsburgh ETD
    Creators/Authors:
    CreatorsEmailORCID
    Gatti, Kerri Alyssakerri.gatti@gmail.com
    ETD Committee:
    ETD Committee TypeCommittee MemberEmailORCID
    Committee ChairVandenbossche, Juliejmv7@pitt.edu
    Committee MemberLin, Jeen-Shangjslin@pitt.edu
    Committee MemberBrigham, Johnbrigham@pitt.edu
    Title: Guidelines for Paving Adjacent Concrete Lanes Seperately
    Status: Unpublished
    Abstract: Often times concrete pavements are constructed by first paving the mainline followed by the shoulder some time later. It is important to factor differences in structure, material properties, and climatic conditions between the mainline and shoulder into the design; otherwise, premature cracking can develop. Cracking can occur in the newly paved lane, the existing lane, or both. The primary objective of this research was to develop guidelines to protect against premature cracking from paving adjacent lanes separately. A review of several case studies revealed that longitudinal shear cracking and transverse cracking in the shoulder are the main distresses associated with delayed shoulder construction. Longitudinal shear cracking occurs due to dissimilar transverse joint openings in the mainline and shoulder. In warm weather, shoulder joints close first causing shear stresses to develop in the mainline. Transverse cracking in the shoulder is caused by thermal incompatibility between the mainline and the shoulder and small shoulder widths (less than 5 ft). The following study uses finite element analysis to analyze the causes of longitudinal shear cracking and transverse cracking in the shoulder. A parametric study was developed for each distress so that guidelines could be established and future occurrences of the distresses can be prevented. Thermal incompatibility between the mainline and the shoulder was the primary factor that caused premature cracking for both distresses. Every effort should be made to prevent the difference of the zero-stress temperatures of the mainline and shoulder from going beyond 20°F.
    Date: 26 January 2011
    Date Type: Completion
    Defense Date: 19 November 2010
    Approval Date: 26 January 2011
    Submission Date: 23 November 2010
    Access Restriction: No restriction; The work is available for access worldwide immediately.
    Patent pending: No
    Institution: University of Pittsburgh
    Thesis Type: Master's Thesis
    Refereed: Yes
    Degree: MSCE - Master of Science in Civil Engineering
    URN: etd-11232010-132824
    Uncontrolled Keywords: concrete pavement; finite element analysis
    Schools and Programs: Swanson School of Engineering > Civil and Environmental Engineering
    Date Deposited: 10 Nov 2011 15:06
    Last Modified: 14 May 2012 14:08
    Other ID: http://etd.library.pitt.edu/ETD/available/etd-11232010-132824/, etd-11232010-132824

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