Pitt | Swanson Engineering
BCOA-ME Technical Documents


Theory Manual Picture

Theory Manual

This document provides an overview of the theory used in the development of the BCOA-ME. The traffic induced loading, climate induced loading, stress calculations, fatigue damage accumulation and calibration are discussed.

Theory Manual (PDF 1.20 MB)
Survey of Existing Projects

Performance of Past Projects

This document reviews the performance of previously constructed bonded concrete overlay of asphalt. The progression of distresses, as well as the predominant failure mode are discussed.

Performance of Past Projects (PDF 3.06 MB)

Failure Modes For 6x6 Slabs

Longitudinal Cracking Structural Model

This document reviews the derivation of the structural models for longitudinal cracking in 6'x6' slabs. The longitudinal cracking failure mode was determined to be the critical failure mode for these slabs, based on observed distresses and supported by a computational analysis. Longitudinal Cracking Structural Models (PDF XXX KB)

Climactic Considerations

Climactic Considerations

This document explains, in-depth, the theory on how climatic effects were accounted for within the BCOA-ME. Both the effect of temperature on the stiffness of the hot mix asphalt and the effect of temperature gradients that develop in the overlay are incorporated in the design process.

See Training Tools Page for a presentation on this topic. Climactic Considerations (PDF 20.6 MB)

Effects of Fiber on Performance

This paper characterizes the effect of structural fibers on the joint performance for BCOA. Effects of Fiber on Performance (PDF XXX KB)

Debonding Models

This document characterizes the bond between the concrete overlay and the existing asphalt structure. Small scale and full scale laboratory testing was performed to determine the fracture mechanics properties of the bond between the concrete and the asphalt and to validate debonding models.

Debonding Models (PDF XXX KB)

Failure Modes For 6x6 Slabs

Identifying Failure Modes of slabs with 1.8 m x 1.8 m (6 ft x 6 ft) Joint Spacing

This paper identifies a longitudinal crack in the wheel path as the predominant failure mechanism in BCOA with joint spacing of 1.8 m x 1.8 m (6 ft x 6 ft). This paper was published in the Transportation Research Record: The Journal of the Transportation Research Board. 

Identifying Failure Modes (Abstract and Citation) (PDF 9 KB)