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Portland cement concrete, like most granular materials, exhibits an increase in compressive strength when subjected to confinement. This characteristic is advantageously used in the design of reinforced concrete columns, for instance, in which the load capacity is considerably increased when the column is properly confined with stirr-ups or spiral reinforcement. Recently, exterior reinforcement in the form of fiberglass composite wrapping has been used to retrofit or repair concrete columns. Wrapping with fiberglass composites increases the capacity of columns to withstand axial as well as eccentric loading. This paper presents comparative test results of small concrete specimens subjected to axial loading and tested under unconfined conditions and confined conditions produced by fiberglass composite wrapping. The test results show a considerable increase in the compressive strength and an increase in the toughness in the fiberglass confined specimens.
Associate professor, California State University Fresno, Fresno, CA
Stock #: CCA10016J