Optimization of production variables of natural fibers- cement composites by response surface methodology (RSM)

Document Type : Research Paper

Authors

1 Ph.D. student Department of Wood and Paper Sciences and Industries, Agricultural science and Natural Resource University of Gorgan, Iran.

2 Associate professor, Department of Bio-systems, Faculty of New technologies Engineering, Shahid Beheshti University,Tehran, Iran

3 Academic Staff Member at University of Zabol

4 Academic Staff Member at University of Zabol.

Abstract

The objective of this
study was to investigate the production of natural-cement composite fiber using
poplar, wheat straw and three types of additives. In this study, variables in
making the boards were: usage percent of wheat straw (0, 15 and 30%) and fibers
of poplar (70, 85 and 100%), and levels and types of additives (three levels
and three types of additives, i.e. calcium chloride, magnesium chloride and
calcium hydroxide, respectively). After producing test specimens, compressive
strength (1, 3, 7 and 28 days), thickness swelling (TS), the modulus of rupture
(MOR), and internal bond (IB), were evaluated. The highest and the lowest
compressive strength (32.5 and 7.1 MPa) after 28 days were respectively for
samples containing 7% calcium hydroxide and 3% magnesium chloride. Also, the
boards with 30 percent wheat straw and 70 percent poplar wood fiber with the
amount of 3% calcium chloride had a higher MOR compared to other boards. In
general, the results suggest that calcium chloride additives with amount of 5%
and the average value of 15% straw to 85% poplar is the appropriate amount for
achieving acceptable values of IB and MOR. Due to its significance in the
statistical analysis, the model presented by Response Surface Methodology
provided a suitable and significant estimate to determine the application of
the variables.

Keywords

Main Subjects

References

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Iranian Journal of Wood and Paper Industries
Volume 11, Issue 1
June 2020
Pages 97-108

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