Effect of Cement/Wood Ratio on Bending Properties of Cement-Bonded Southern Pine Excelsior Board
Keywords:Cement excelsior board, southern pine, Portland cement, cement/wood ratio, bending properties
AbstractThe price of southern pine excelsior is much higher than that of Portland cement on the weight basis. This study was undertaken to investigate the possibility of using more cement and less excelsior in order to reduce the manufacturing cost of cement excelsior board (CEB). The experimental boards were made at three cement/wood (oven-dry weight basis) ratios: 2.0/1, 2.3/1, and 2.6/1. The results indicated that the bending properties of CEB made at these cement/wood ratios met the requirements of commercial standards. However, the increase of cement/wood ratio above 2.0/1 had an adverse effect on bending properties of CEB.
American Society for Testing and Materials. 1978. Annual book of ASTM standards, Part 22. Philadelphia, PA.nBiblis, E. J., and C. F. Lo. 1968. Sugars and other wood extractives effect on the setting of southern pine-cement mixtures. For. Prod. J.18(8):28-34.nConcrete Products, Inc. 1984. Personal communication. Brunswick, GA.nLee, W. C. 1984. Physical and mechanical properties of cement bonded southern pine excelsior board. For. Prod. J.34(4):30-34.nMoslemi, A. A., J. F. Garcia, and A. D. Hofstrand. 1983. Effect of various treatments and additives on wood-Portland cement-water systems. Wood Fiber Sci.15(2):164-176.nPrestemon, D. R. 1976. Preliminary evaluation of a wood-cement composite. For. Prod. J.26(2):43-45.nStructural Cement-Fiber Products Association. 1970. Uniform standards and specifications. Washington, DC.nWeatherwax, R. C, and H. Tarkow. 1964. Effect of wood on setting of Portland cement. For. Prod. J.14(12):567-570.nWeatherwax, R. C, and H. Tarkow. 1967. Effect of wood on the setting of Portland cement: Decayed wood as an inhibitor. For. Prod. J.17(7):30-32.n
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