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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Fiber cement boards modified with styrene-acrylic copolymer: An approach to address dimensional stability and cellulose fiber preservation

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Author(s):
Cruz, E. O. [1] ; Radler, M. J. [2] ; Perello, M. [3] ; Savastano Jr, H.
Total Authors: 4
Affiliation:
[1] Dow Brazil SA, Av Andre Costa 2201, BR-13214730 Jundiai, SP - Brazil
[2] Dow Chem Co USA, Midland, MI 48674 - USA
[3] Dow Europe GmbH, Horgen - Switzerland
Total Affiliations: 3
Document type: Review article
Source: JOURNAL OF COMPOSITE MATERIALS; v. 55, n. 3 AUG 2020.
Web of Science Citations: 0
Abstract

The performance of polymers such as acrylics, styrene-acrylics, styrene-butadiene, ethylene vinyl acetate, type added in cementitious composites are well reported in the literature to boost properties in the fresh mortar stage as workability, anti-bleeding, and hard stage as deformation, adhesion strength, crack bridging, cohesion, durability and reduced water uptake. Polymer treatment was performed in fiber cement boards by adding 5% w/w (dry basis) of styrene-acrylic copolymer aiming to investigate the impact on the mechanical and physical properties at initial curing period (28 days) and after the 200 soak and drying ageing cycles. Dimensional stability at 28 days and the cellulose fiber/cement interface transition zone were assessed by scanning electron microscopy combined with dispersive energy X-ray spectroscopy (EDS). These experiments confirmed that the water absorption value in polymer modified cement boards was reduced by 50% after the ageing cycles when compared to the unmodified boards. Additionally, improvements on board's rigidity with reduction of modulus of elasticity (MOE) values up to 40% and 15% reduction of board shrinkage was noticed, enhancing boards dimensional stability and preventing fibers from the mineralization process by keeping the cellulose fiber adhered on the cementitious matrix, providing a dense and cohesive fiber-cement interface transition zone after the ageing cycles. This achievement can open important fields of application for the reinforcement of flat panels. (AU)

FAPESP's process: 14/50948-3 - INCT 2014: advanced eco-efficient technologies in cementitious products
Grantee:Vanderley Moacyr John
Support Opportunities: Research Projects - Thematic Grants