Physico-mechanical properties of cement bonded ceiling board developed from teak and African locust bean tree wood residue

2021 ◽  
Vol 44 ◽  
pp. 2865-2873
Author(s):  
I.O. Ohijeagbon ◽  
M.U. Bello-Ochende ◽  
A.A. Adeleke ◽  
P.P. Ikubanni ◽  
A.A. Samuel ◽  
...  

The aim of this work was to compare mechanical properties of iroko particle boards produced with two different tannic powders. Two vegetable-based binders were used: African locust bean pod (Parkia Biglobosa (PB)) and bark of India tamarind peel (Pitecllobium Dulce (TD)) to bind the particles of Iroko to produce ecological panels without formaldehyde emission. For this study five binder rate 5%; 7.5%; 10%; 12.5% and 15% were used to make particle board of each binder. Hardness, bending, tensile and internal bound tests were performed in order to assess the mechanical properties (MOE, MOR, E, MOT, IB and HB). The results showed that the mechanical properties increase with binder rate. The mechanical properties of the panels produced from these two different binders met the threshold set by ANSI A208.1 (2009). Moreover, it was found that, the values of MOE, MOR, E, MOT obtained for African locust bean pod (Parkia Biglobosa) where higher than those found for bark of Pitecllobium Dulce On the other side, panels made with bark of Pitecllobium Dulce showed higher HB and IB values than those made with African locust bean pod.


2020 ◽  
Vol 152 ◽  
pp. 15698-15708
Author(s):  
COULIBALY DIAKITE Mariam ◽  
PARKOUDA Charles ◽  
COMPAORE Sidbewendé Clarisse ◽  
SAVADOGO Aly

Les graines de néré (Parkia biglobosa) sont transformées traditionnellement en Afrique de l’Ouest en des condiments fermentés sous différentes appellations : soumbala au Burkina Faso, nététu au Sénégal, soumbara en Guinée Conakry, dawadawa et iru au Nigéria, afitin, iru et sonru au Bénin. Ces produits sont caractérisés par la variabilité de leur qualité et des contraintes liées à leur production. La présente revue a pour objectif d’analyser les technologies traditionnelles utilisées pour la production de ces condiments fermentés à base de graines de néré et de faire ressortir les contraintes/difficultés de production de ces condiments. Les données ont été collectées à travers les documents physiques consultés (thèses et mémoires) et à partir des articles scientifiques et d’autres documents trouvés en ligne. Il en résulte que les technologies de production traditionnelle des condiments à base de graine de néré en Afrique de l’Ouest, incluent principalement selon les zones et les ethnies, une première cuisson des graines allant de 12-48 h, un décorticage manuel des graines cuites, une seconde cuisson des graines décortiquées et lavées variant de 1-4 h et enfin, une fermentation des cotylédons cuits allant de 24-120 h. Ces technologies ont également en commun, des contraintes majeures de pénibilités du processus de cuisson, du décorticage/lavage, de la consommation importante d’énergie, d’eau et de temps. Les données de cette revue ouvrent ainsi de nouvelles pistes de recherche pour l’amélioration des procédés traditionnels de transformation des graines de néré. Mots clés : Graines de néré, condiment, soumbala, procédé, pénibilité. Coulibaly Diakite et al., J. Appl. Biosci. 2020 Technologies traditionnelles de transformation des graines de néré (Parkia biglobosa Jacq. R.Br.) en Afrique de l’Ouest : revue des principaux produits dérivés et contraintes de production 15699 Traditional technologies for processing African locust bean seeds (Parkia biglobosa Jacq. R.Br.) in West Africa: review on the main derivatives and production constraints. ABSTRACT African locust bean (Parkia biglobosa) seeds are traditionally transformed in West Africa into fermented condiments under different names: soumbala in Burkina Faso, netetu in Senegal, soumbara in Guinea Conakry, dawadawa and iru in Nigeria, afitin, iru and sonru in Benin. These products are characterized by the variability of their quality and the constraints linked to their production. The objective of this study is to analyze the traditional technologies used for the production of these fermented condiments and to highlight the constraints/difficulties associated to their production. The data were collected through the physical documents consulted (theses and dissertations) and from scientific articles and other documents found online. It appear that the traditional technologies used to produce P. biglobosa seeds based-condiments in West Africa, mainly include, according to the zones and ethnic groups, a first cooking of the seeds ranging from 12-48 h, a manual dehulling of the cooked seeds, a second cooking of the dehulled and washed seeds varying from 1-4 h and finally, a fermentation of the cooked cotyledons ranging from 24-120 h. These technologies have in common the major constraints of hardness of the process of cooking and dehulling/washing, significant consumption of energy, water and time. Data from this review opens research perspectives for the improvement of the traditional processing of P. biglobosa seeds. Keywords: P. biglobosa seeds, condiment, soumbala, process.


Author(s):  
Jevgenijs Jaunslavietis ◽  
Galia Shulga ◽  
Jurijs Ozolins ◽  
Brigita Neiberte ◽  
Anrijs Verovkins ◽  
...  

The aim of the work was to evaluate the effect of the acidic treatment temperature of aspen sawdust as a filler on the moisture sorption, wetting and mechanical properties of wood-polymer composites. Aspen wood sawdust was treated with the dilute hydrochloric acid solution at 60oC and 90oC during 5 h. Both the treated particles and the filled composites were studied in terms of moisture sorption and wettability; their surface free energy was calculated using the Owens-Wendt-Rabel-Kaelble (OWRK) approach. The obtained results have shown that the acidic treatment of aspen wood sawdust at 90oC leads to an increase in its hydrophobicity that decreases the wettability and moisture sorption of the obtained composite and increases its mechanical properties.


2004 ◽  
Vol 3 (3) ◽  
pp. 140-145 ◽  
Author(s):  
Bridget O. Omafuvbe . ◽  
Olumuyiwa S. Falade . ◽  
Bolanle A. Osuntogun . ◽  
Steve R.A. Adewusi .

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