Treatments of residual pine strands: characterization and wood-cement-compatibility

Author(s)

Cabral, Matheus R. ^{[1, 2]} ; Nakanishi, Erika Y. ^[1] ; Franco, Mayara S. R. ^[1] ; Santos, Sergio F. ^[3] ; Fiorelli, Juliano ^[1]

Affiliation

^[1] Univ Sao Paulo, Fac Anim Sci & Food Engn, Dept Biosyst Engn, Pirassununga - Brazil

^[2] Laval Univ, Forest & Wood Sci Dept, NSERC Ind Res Chair Ecoresponsible Wood Construct, Quebec City, PQ - Canada

^[3] Sao Paulo State Univ UNESP, Sch Engn, Dept Mat & Technol, Guaratingueta - Brazil

• Document type: Journal article
• Source: JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY; v. 40, n. 6, p. 396-407, OCT 7 2020.
• Web of Science Citations: 0

Abstract

This paper aims to evaluate treatments on pine strands as well as wood-cement compatibility. The strands were prepared and then were submitted to four treatments (untreated; cold water, hot water and NaOH). Physical, chemical, thermal and mechanical properties of the strands were measured. Wood-cement composites were produced with all strand treatments. To evaluate the strand effects on the cement hydration, axial compression tests were conducted at 28-day. The phases of the matrix of the composites at 24 h 7- and 28-day were also determinate. Fourier transform infrared spectra shows that, although the treatments partially removed the hemicellulose and extractives, they also reduced the cellulose and lignin bands. Axial compression results indicated that there were no differences between values for the composites with untreated and treated strands. For the phase analyses, in the initial ages (24 h and 7-day), it was identified that portlandite for cement sample (control) is higher than those containing the strands. At 28-day, it was found that among the strands, the untreated have the lower portlandite content and the higher calcium carbonate content. Indicating the cement carbonation over time as presented in the cement sample (control). Therefore, the untreated pine residual strand showed good compatibility with cement and for this study there were no benefits on treating the strands. (AU)

• FAPESP's process: 16/07372-9 - Particleboard based on biomaterials with functional gradation for using as piglet shelter
• Grantee: Erika Yukari Nakanishi
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 17/18076-4 - Flat and trapezoidal/corrugated OSB particle board of residual forest biomass: numerical and experimental analyses
• Grantee: Juliano Fiorelli
• Support Opportunities: Regular Research Grants