Evaluation of mechanical performance of cement matrix composites with dispersed phases used in substitution to asbestos

摘要

Technologies used nowadays require the manufacturing and development of materials with unique properties and performance that can only be achieved by composites, which combine different materials. Because of the chemical and morphological characteristics of asbestos fiber and its efficient anchoring effect, the cement-asbestos composite was widely used in the civil construction up to the 1960s, when handling of this fiber started to be considered hazardous to human health. Since then, researches have been developed in order to obtain alternative products to asbestos. In this work, cement matrices reinforced with different phases were investigated as replacements to asbestos. This investigation was based on the correlation between apparent porosity and four-point flexural resistance. Wollastonite, polypropylene, rice shell ash, and vermiculite were evaluated as substitutes to asbestos.