(L) Seeds on Germination of Striga Hermonthica (Del.) Benth Seeds

JOURNAL OF FOREST PRODUCTS & INDUSTRIES, 2013, 2(4), 16-21 ISSN:2325–4513(PRINT) ISSN 2325 - 453X (ONLINE)21affect the process of cement setting. Which result in poorcoating of wood particles with cement, so when subjected tomoisture, they absorbed large quantity of water.IV. CONCLUSIONSBased on the findings and results of this study, the followingconclusions can be drawn:-- Mesquite (Prosopis chilensis) wood extractives cansuccessfully be removed or minimized by soaking incold water.- Mesquite wood can combine well with cement evenwithout treatment.- Addition of gypsum (10% based on cement weight)increased the compressive strength more than 100%when compared with the other treatments.- The addition of gypsum resulted in better performancethan the addition of Calcium chloride.- Increasing cement portion resulted in increasedaggregates density, increased compressive strengthand lower percentage of water absorption.- The gypsum partial substitute of 10% increased thecompressive strength more than hundred percent whencompared with the percentage 30 and 50, thisexpressed that the partial substitute of cement bygypsum in fewer amount is sufficient to improve theaggregates compressive strength.REFERNCES[1] Sandermann, H.J. Preusser, and W. Shweers. 1960. The effect of woodextractives on the setting of cement-bonded wood materials.Holzforschung 14(3):70-77.[2] Simatupang, M.H. 1979. The water requirement of manufacturedcement-bonded particleboard. Holz Roh-Werkst 37:379-382.[3] Miller, D. P. 1987: Wood-cement composite: interactions of woodcomponents with Portland cement Ph.D. Dissertation, University of Idaho,and Moscow, Idaho, USA.[4] Abdelgadir, A.Y. and M.F.S. Ibrahim 2003. Effect of pretreatments andcement/wood ratio on compatibility of wood with Portland cement. SudanSilva 9(2): 77-85.[5] Ashraf M.A. Abdalla and A.Y. Abdelgadir. 2006. Effect of particle size andcement/wood ratio on some properties of Acacia nilotica wood-cementaggregates. Sudan Silva 12(1): 41-52[6] Bashir, Amel, A; Abdelazim Y. A. and Osman T. Elzaki 2007. Effect ofCement/Wood Ratio, Calcium Chloride Content and Pressure oncompressive Strength of Acacia seyal Wood-Cement Aggregates. SudanSilva 13 (1): 25-35.[7] Ashraf Mohamed Ahmed Abdalla; Tarig Tag Elsir Hassan; Abdelazim YassinAbdelgadir and Abdael Lateif El Tayeb Mahoumd. 2010. Effect of coldwater duration extraction and calcium chloride treatment on physicalproperties of Acacia nilotica wood-cement aggregates. Sudan Silva 14(1):1-9[8] Dinwoodie, J. M.; Paxon, B. M. 1983: wood cement particleboard- Atechnical assessment. Building Research Establishment informationpaper. IP 4/83:1-4.[9] Paramenwaran, V. N.; Broker, F. W.and Simatupang, M. H. 1977: Micromorphological studies on mineral-bonded wood composite. Interactionbetween binders and wood. Holzforschung 31: 173-178.[10] Parameswaran, V. N.; Broker, F. W. 1979; Micro morphologicalinvestigation on wood- cement composite after long –term use.Holzforchung 33:97-102.[11] Abdelazim Yassin Abdelgadir and Ashraf M. Ahmed Abdalla. 2005.Effect of wood pretreatments on the modulus of rupture of Acacia niloticawood-cement aggregate. Sudan Silva 11(1): 79-84[12] Gnannaharan, R, and T. K. Dhamodaran, 1985. Suitability of sometropical hard wood for cement-bonded wood-wool board manufacturesHolzforschung 39(6):337-340.[13] American Society of Testing and Materials 1956 (ASTM). Annual Bookof ASTM Standards, Vol. 04-02. C39-83b.[14] SAS Institute Inc. 1990. SAS/STAT Guide for Personal computers. Version6 Ed. SAS Institute Inc., Carry, NC.[15] Mohammed, A.A 1999.The effect of wood extractives of someSudanese tree species on Portland cement setting M.Scthesis submitted tothe University Khartoum.[16] Ahn, W. Y.; Moslemi,A.A. 1980. SEM examination of Portland cementbonds. Wood Sciences and Technology. 13: 17-82.[17] Hassan, T.T.E. 1999. Effect of Some Physical and Chemical additives onthe mechanical and physical properties of Acacia nilotica wood cementmixture. M.Sc. Thesis submitted to the University of Khartoum.[18] Ibrahim. M. F. 1995. Effect of Species Treatment and Cement woodRatios on the Compressive Strength of Wood-Cement Mixture. M.Sc.Thesis, Faculty of Forestry, University of Khartoum-Sudan.[19] Zhou, Y.; Kamdem, D.P. 2002. Effect of cement/wood ratio on theproperties of cement-bonded particleboard using CCA-treated woodremoved from service. Forest Products Journal 52 (2): 73-81.[20] Oyagade, A.O.; S.O.O. Badejo, and O. A. Omole 1995. A preliminaryevaluation of flexural properties of wood-veneer laminatedcement-bonded particleboard from tropical hardwood species. Journal oftropical forestry and wood technology of the timber Developmentassociation of India 41 (3): 25-29.[21] Elten, G.V. 2000. Production, Properties and application of various woodscement products. Especially wood Journal. September/October2000:18-24.