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Durability of cellulose fibers reinforced composites

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Author(s):
Silva, Aluízio Caldas e
Total Authors: 1
Document type: Master's Dissertation
Press: São Paulo. [2002]. 128 f.
Institution: Universidade de São Paulo (USP). Escola Politécnica
Defense date:
Examining board members:
John, Vanderley Moacyr; Armelin, Hugo Sogayar; Savastano Junior, Holmer
Advisor: John, Vanderley Moacyr; Savastano Júnior, Holmer
Field of knowledge: Engineering - Civil Engineering
Indexed in: Banco de Dados Bibliográficos da USP-DEDALUS; Biblioteca Digital de Teses e Dissertações - USP
Location: Universidade de São Paulo. Escola Politécnica. Biblioteca de Engenharia Civil; EPEC/FD-3227
Abstract

Vegetable fibers and alternative cements from residues is a good option for replacement asbestos-cement. However, research development has presented no satisfactory results concerning material durability. Methods of performance evaluation to reinforced materials with alcali sensitive fibers are not well developed. The objetives of this research are: a) evaluation of composites behavior produced with blast-furnace slag reinforced with residual cellulose fibers, which were moulded in adapted conventional industrial processes, common in fibercement companies around world and b) durability performance evaluation applying proposed aging tests. Aging tests were based on simulation of main agents and degradation mechanisms. Physical and mechanical behaviour of composites was evaluated considering important properties in building component uses. Cellulose fibers improved the mechanical properties of the composites. Durability presented different results for the two matrices. The matrices activated with gypsum and hydrated lime (EGCH) have been less aggressive than matrix activated with ordinary Portland cement (OPC) in relation to fibers. However, they presented problems concerning to the hydration at early dates and loss of resistance due to carbonation. Matrices activated with OPC presented better results of MOR at the early dates. In fact, they are more alkaline and they decomposed fibers and reduced the mechanical properties during the aging. The carbonation reduced the alkaline attack, stabilizing the MOR and reducing the loss of tenacity. The accelerated methods with carbonation were efficient in the simulation of the natural ageing. (AU)

FAPESP's process: 01/03833-6 - Development of technology for the manufacture of fibro-cement tiles without asbestos
Grantee:Holmer Savastano Junior
Support type: Research Grants - Research Partnership for Technological Innovation - PITE