Effect of Changes in Matrix Properties With Time on the Measured and Predicted Long Term Properties of Fiber Reinforced Cement

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Title: Effect of Changes in Matrix Properties With Time on the Measured and Predicted Long Term Properties of Fiber Reinforced Cement

Author(s): D J. Hannan

Publication: Special Publication

Volume: 126

Issue:

Appears on pages(s): 783-798

Keywords: durability; fiber reinforced cement; flexure; polypropylene; tension; Materials Research

Date: 8/1/1991

Abstract:
Natural weathering, dry air storage, and water curing for long periods of time will have different effects on matrix properties in most fiber reinforced cements. Changes in matrix properties are shown to effect the cracking stress of the composite that will change with time and curing conditions, regardless of changes in fiber properties. The reasons for the differences in the critical fiber volume in uniaxial tension and flexure are explained, and examples are given of 10-year tests on thin cement-based sheets containing networks of fibrillated polypropylene film in which the effects are demonstrated. It is shown that the manufacturer of the composite needs to have an understanding of these problems if the component is to remain ductile for many years in natural weathering conditions.