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Extra info for Vegetable Plants and their Fibres as Building Materials: Proceedings of the Second International RILEM Symposium (RILEM Proceedings 7)

Example text

A “*” in this table represents moderately significant effects, and “**” represents major effects at 5% level of significance From the results it can be concluded that the effect of fiber mass content was quite significant for setting time, fresh mix unit weight, and hardened material water absorption and specific gravity, while it was moderate for flow, air content and void content. Table 3. Factorial Analysis of Fresh Mix and Hardened Material Properties Property Fiber Cont. Flow * Initial Setting ** Final Setting ** Unit Weight ** Air Content * Void Content * Water Absorption ** Specific Gravity ** In order to see if there is any relationship between the fresh mix air content, and the hardened material void content, specific gravity and water absorption correlation coefficients were calculated analyzed statistically.

Mechanical pulps also contain lignin, which dissolves in water and interferes with the process of cement hydration, thereby further retarding the setting time of the fibrous cement composites. Wood fibers are observed in Table 2 to reduce the unit weight of fresh mixtures. The reduction in unit weight was 15% when 2% mass fractions of mechanical pulps was added. This is due to the fact that the air content in cementitious matrices tends to increase in the presence of fibers, as discussed below.

1579–1584. MARIKUNTE Department of Civil and Environmental Engineering, Michigan State University, East Lansing, USA Abstract Wood fiber reinforced cement can provide the highest performanceto-cost ratio among fibrous cement composites considered for the replacement of asbestos cement. Such composites can find applications in the production of thin flat and corrugated cement sheets, nonpressure pipes and many other thin-sheet cement products. There are, however, concerns regarding the moisture-sensitivity of wood fibercement composites.

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