Abstract
In order to study the effect of polypropylene fibers on the durability of cementitious composites, several experimental tests have been carried out in the laboratory. The composite was tested with different volume fractions of polypropylene fibers (0.05%, 0.10%, 0.30% and 0.50%). All the results relating to the indicators (porosity accessible to water εb, to the oxygen permeability Kapp.gas and diffusivity Dns) indicate that the addition of polypropylene fibers in a cement matrix represents only a small effect on durability. This panel of general sustainability indicators can be supplemented by indicators more specific to each degradation process identified or envisaged depending on the environmental conditions of the structure. However, the addition of the volume fraction of polypropylene fibers (0.50%) in a cementitious composite, increases fire resistance. Such behavior gives fiber composites interesting properties which favor their use in structures exposed to fire risks.
Highlights
Nowadays, the addition of fibers to a cement matrix is a technique to be explored in the field of polymer reinforced materials [1,2,3,4]
The results of durability indicators of laboratory samples in a cured state according to the different volume fractions of polypropylene fibers are presented in Tab. 3
This porosity remains low compared to other matrices with other types of fibers; in the case of steel fibers [28], a study showed that the addition of these fibers with a length of 30 mm, did not affect the porosity when the volume fraction varied from 0.50 to 1% but, beyond 1%, there was a slight increase in porosity
Summary
The addition of fibers to a cement matrix is a technique to be explored in the field of polymer reinforced materials [1,2,3,4]. A cement matrix structure must resist various aggressions or stresses (physical, mechanical, chemical, etc.), it can be subjected to various actions such as wind, rain, cold, heat, ambient environment, while maintaining its aesthetics It must meet the needs of users at a constant level during its lifetime. Durability is directly linked to the immediate or future environment of the structures and is today the important parameter to consider in order to optimize the resistance of concrete to external influences: bad weather, soil aggressiveness, and chemically aggressive atmospheres [16]. The aim of this work is to study the influence of the addition of polypropylene fibers in a cement matrix on the durability and fire resistance of the composite. The conclusion summarizes the main results related to the durability of the cementitious composite and the identification of the best fiber composition in the cement matrix in terms of fire resistance as well as its benefits and future prospects
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