Cement-based corrugated sheets reinforced with polypropylene fibres subjected to a high-performance curing method

Author(s)

Fioroni, Carlos Alexandre ^[1] ; de Mello Innocentini, Murilo Daniel ^[2] ; de Los Dolores, Gonzalo Marmol ^[1] ; Denzin Tonoli, Gustavo Henrique ^[3] ; de Paula, Gustavo Rocha ^[4] ; Savastano, Holmer ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Biosyst Engn, Res Nucleus Mat Biosyst, Ave Duque de Caxias Norte 225, BR-13635900 Pirassununga, SP - Brazil

^[2] Univ Ribeirao Preto UNAERP, Course Chem Engn, Ave Costabile Romano 2201, BR-14096900 Ribeirao Preto, SP - Brazil

^[3] Univ Lavras UFLA, Dept Forest Sci, BR-37200000 Lavras, MG - Brazil

^[4] Infibra SA, Rd Anhanguera Km 186, BR-13612200 Leme, SP - Brazil

• Document type: Journal article
• Source: CONSTRUCTION AND BUILDING MATERIALS; v. 262, NOV 30 2020.
• Web of Science Citations: 0

Abstract

This work proposes and evaluates a curing method based on the accelerated carbonation (AC) for cement-based corrugated sheets reinforced with polypropylene (PP) fibres produced by the Hatschek process. These corrugated sheets were experimentally evaluated in order to identify how the AC affects the fibre-cement composites. The obtained performance was compared with air-cured corrugated sheets reinforced with PP fibres and air-cured corrugated sheets reinforced with polyvinyl alcohol (PVA) fibres. The AC conferred a high carbonation degree (86%) increasing bulk density (13%) and decreasing apparent porosity (22%) and water absorption (28%) by means of calcium carbonate formation. The modulus of elasticity (10.7 GPa) and limit of proportionality (8.3 MPa) doubled in comparison with air-cured corrugated sheets. The Darcian (k(1)) and non-Darcian (k(2)) permeability coefficients were retrieved from the Forchheimer's equation. The clogging of the permeable pores caused by the AC resulted in a reduction of 49% and 95% in k(1) and k(2), respectively. The drying shrinkage halved (1 mm/m) by the influence of AC which clogged pores with carbonates in the range 0.06-1.50 mm. Water-tightness test and its evaluation through digital image analysis showed a reduced moistened area in the AC cured corrugated sheets (22% lower) and enabled the identification of the cracks, which have a great influence on water tightness and permeability. The AC mitigated defects and conferred lower permeability and higher physical-mechanical performance in comparison to the air-cured PP and PVA reinforced corrugated sheets. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 13/50897-7 - Curing technology in CO2 saturated environment for constructive components based on fiber-cement
• Grantee: Holmer Savastano Junior
• Support Opportunities: Research Grants - Research Partnership for Technological Innovation - PITE