Graduation Semester and Year

2019

Language

English

Document Type

Dissertation

Degree Name

Doctor of Philosophy in Civil Engineering

Department

Civil Engineering

First Advisor

Mohammad Najafi

Abstract

Millions of culverts under road embankments provide drainage for U.S. transportation network system and are in need of maintenance, repair, and renewal. Over time culverts, like any other asset, deteriorate due to many factors. Spray applied pipe lining (SAPL) is one of the trenchless technology methods applicable for culverts renewal. In the SAPL method, polymers or cementitious materials are sprayed by machine or manually in different lifts to achieve required thickness based on the design criteria. The scope of this dissertation includes reinforced concrete pipe and corrugated metal pipe (RCP and CMP) culverts renewal with cementitious and polymer SAPLs. The objectives of this dissertation are to develop a framework for design and installation of SAPL. Due to lack of standards for structural design of SAPL, different vendors and contractors have come up with different design methodologies. Data collected through this research shows that with the same material properties, different thicknesses were applied with similar host culvert conditions. The methodology used in this dissertation includes literature review, evaluation of contractors’ practices, survey of U.S. departments of transportations (DOTs) and Canadian transportation agencies, and numerical analysis of deteriorated CMP lined with cementitious SAPL. The results of this dissertation show that (1) Different contractors/vendors use different design equations, (2) CMP culverts with deteriorated inverts and RCP culverts with longitudinal cracking and joint separation are the most common reasons for considering condition of a culvert as fully deteriorated, (3) The most common installation problems in cementitious SAPLs are longitudinal and circumferential cracking, hairline cracking, and cracking at joints, (4) The expected design life of SAPL is 50 to 75 years, (5) The structural behavior of SAPLs is related to many variables, such as, soil embedment of the host culvert, SAPL thickness, and shapes of host culvert, and (6) Compared with circular-shape CMP lined with cementitious SAPL, a lined arch-shape CMP deflects in the range of 15 to 40% more than circular-shape.

Keywords

Culvert, Spray applied pipe linings

Disciplines

Civil and Environmental Engineering | Civil Engineering | Engineering

Comments

Degree granted by The University of Texas at Arlington

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