Evaluation of the stability of polypropylene fibers in environments aggressive to cement-based materials
- Univ. Estadual de Campinas, Sao Paulo (Brazil). Inst. de Quimica
Isotactic polypropylene (PPi) fibers were left in NaOH, H{sub 2}SO{sub 4}, synthetic seawater, and cement-with-water solutions at different temperatures and exposure times. Infrared microspectroscopy was used to follow the formation of degradation products. Cement-with-water was the most aggressive bath for the fibers, causing marked oxidation after 100 days exposure; also, the molecular weight of PPi increased as determined by viscosimetry. Mortar test specimens containing PPi fibers and exposed to CO{sub 2}, synthetic seawater, and MgSO{sub 4} 0.25 M showed a decrease in compressive strength after 260 days. The compressive strength of mortar test specimens containing 0.75 kg/m{sup 3} of PPi fibers irradiated with ultraviolet radiation was roughly 10% lower than that of the control specimen, after only 60 days in water.
- OSTI ID:
- 600048
- Journal Information:
- Cement and Concrete Research, Vol. 28, Issue 1; Other Information: PBD: Jan 1998
- Country of Publication:
- United States
- Language:
- English
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