Bond strength, long term performance and temperature induced stresses in polymer concrete-portland cement concrete composite members

Miscellaneous · Fri Jan 01 00:00:00 EST 1988

OSTI ID:6384332

Al-Negheimish, A I

A comprehensive investigation of the causes of delamination of polymer concrete (PC) overlays was undertaken. Part I covers the material properties of PC and portland cement concrete (PCC). Part II was an experimental test program to study the performance of PC-PCC composite beams under static and fatigue loads. Parameters such as overlay thickness, reinforcement ratio, temperature, and the presence of a pre-crack at the composite interface were studied. For the fatigue tests, a cyclic load simulating the maximum applied interface shear stresses in a typical highway bridge slab with a PC overlay was applied to PC-PCC composite beams with the objective of finding the effect of 2 million cycles of repeated loadings on the composite interface. Part III covers experimental as well as analytical studies of thermally-induced stresses in PC-PCC composite members. The results from the static tests showed that delamination of the PC overlays with excellent initial bond can not be attributed solely to mechanical load or overload of the highway bridge deck. In the thermal stresses investigation, it was found that interface shear stresses in composite members resulting from uniform temperature changes are edge-bound and concentrated in a narrow region near the ends of the members. The finite element analysis showed that interface stresses consist of shear as well as normal stresses with the normal stresses being tensile at temperatures below room temperature. The results from the finite element analysis showed presence of significant tensile stresses in the PCC below the interface near the end of the beam. Thermal fatigue was found not to be a problem with the bond of PC-PCC slabs made of good quality PCC. However, slabs made of poor quality PCC showed some deterioration of the bond with freeze-thaw cycling.

• Research Organization: Texas Univ., Austin, TX (USA)
• OSTI ID: 6384332
• Resource Relation: Other Information: Thesis (Ph.D)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
MECHANICAL PROPERTIES
CONCRETES
POLYMERS
BRIDGES
CRACK PROPAGATION
DYNAMIC LOADS
FATIGUE
FINITE ELEMENT METHOD
FREEZING
INTERFACES
PERFORMANCE TESTING
PORTLAND CEMENT
ROADS
STATIC LOADS
STRESSES
SURFACE COATING
THAWING
THERMAL CYCLING
THERMAL STRESSES
THICKNESS
BUILDING MATERIALS
CEMENTS
DEPOSITION
DIMENSIONS
MATERIALS
MECHANICAL STRUCTURES
NUMERICAL SOLUTION
TESTING
360603* - Materials- Properties