NDLI: Characterizing the setting of cement when mixed with cork, blue gum, or maritime pine, grown in Portugal II: X-ray diffraction and differential thermal analyzes

Content Provider	Springer Nature Link
Author	Pereira, Catarina Caldeira Jorge, Fernando Irle, Mark Ferreira, José Maria
Copyright Year	2006
Abstract	It is already known by the scientific and industrial communities that lignocellulosic substrates are, to a certain extent, inhibitors of the hydration reaction of cement. The extent to which and how they influence such reactions is still a matter of debate. Several techniques, such as calorimetry, i.e., the measurement of the heat evolved or obtaining temperature profiles during the hydration, the determination of extractive contents of lignocellulosic substrates and their relation with the characteristics of the hydration curves, or even testing of the mechanical properties of the wood-cement composites, have been used in previous research. This study complements past research using two techniques that have been used in the analysis of cement hydration but are not usually applied to lignocellulose-cement mixes, namely X-ray diffraction (XRD) and differential thermal analysis (DTA). The raw materials for this study were three lignocellulosic materials of Portuguese origin: cork (the bark of Quercus suber L.), blue gum (Eucalyptus globulus Labill.), and maritime pine (Pinus pinaster Ait); and Portland cement. The two techniques allowed tracking of the evolution of the main cement constituents during hydration. It was found that all the lignocellulosic substrates had detrimental effects on cement hydration. The blue gum exhibited the fastest hydration kinetics in the initial stage of reaction, but was then overtaken by cork, which at the end gave the highest hydration conversion amongst the three lignocellulosic substrates. Although pine caused the slowest initial hydration kinetics, with the passage of time its effect approached that of blue gum. At the end of the hydration period, specimens containing either species had similar quantities of hydration reaction products. The DTA and XRD results were consistent and are in good agreement with the temperature profiles and compatibility indexes reported in a previous work.
Starting Page	318
Ending Page	324
Page Count	7
File Format	PDF
ISSN	14350211
Journal	Journal of Wood Science
Volume Number	52
Issue Number	4
e-ISSN	16114663
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-03-02
Publisher Place	Tokyo
Access Restriction	Subscribed
Subject Keyword	Cement Wood Cork X-ray diffraction Differential thermal analysis Materials Science Characterization and Evaluation Materials Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Biomaterials Forestry

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