Young’s modulus and thermophysical performances of bio-sourced materials based on date palm fibers

Published Date
1 October 2016, Vol.129:589–597, doi:10.1016/j.enbuild.2016.08.034

Author 

• Mourad Chikhi ^,

• Unité de Développement des Equipements Solaires, UDES/Centre de Développement des Energies Renouvelables, CDER, Bou Ismail, 42415, W. Tipaza, Algeria

Received 6 April 2016. Revised 26 July 2016. Accepted 9 August 2016. Available online 10 August 2016.

Highlights

• Thermomechanical investigations of bio-sourced composite were interested.
• •
  Thermal resistance and time lag properties of composites were studied.
• •
  E of composites is mainly affected by the interfacial adhesion between components.
• •
  Effect of DPF sizes and loadings is highly significant on the stiffness of gypsum.
• •
  DPF adding on gypsum increases both time lag and thermal resistance of composites.

Abstract 

The present work is a part of a large project aimed at design and development of new composite materials containing date palm fibers (DPF) primarily suitable for thermal insulation in various sectors, especially in the building sector. On one hand, porosity (P) and Young’s modulus (E) of gypsum based composites reinforced with DPF were investigated. On other hand, thermal resistance and time lag of composites were also studied. The results showed that E of DPF reinforced gypsum materials is mainly affected by the interfacial adhesion between matrix and DPF. The effect of DPF sizes and loadings is highly significant on the stiffness of gypsum. It’s noted that the adding of DPF on gypsum induces an increase of both time lag and thermal resistance of composites. This new biocomposite can be used as a raw material for reinforcement gypsum materials in order to produce a friendly biocomposite materials to use for thermal insulation in buildings.

Keywords

Young’s modulus

Porosity

Thermal resistance

Date palm fibers (DPF)

Building materials

Nomenclature

R_th

Thermal resistance (W⁻¹ m² K)

t

Thickness of the material (m)

k

Thermal conductivity (W m⁻¹ K⁻¹)

T

Periodic cycle of temperature variation (h)

cp

Specific heat (Wh kg⁻¹ K⁻¹)

ρ

Density (kg m⁻³)

Φ

Time lag (h)

F

Applied force (N)

L

Support span (m)

l

Width of sample (m)

d

sample deflection under F (m)

E

Young’s modulus (Mpa)

φf

Masse weight fraction of fibers (wt.%)

a

Diffusivity (m² s⁻¹)

m

Weight (Kg)

Weight fraction of fibers (%)

P

Porosity (%)

Subscript

m

matrix

f

fiber

r

real density

b

bulk density

 Table 1

Table 1.

 Table 2

Table 2.

Fig. 1.

 Table 3

Table 3.

Fig. 2.

Fig. 3.

Fig. 4.

Fig. 5.

Fig. 6.

Fig. 7.

 Table 4

Table 4.

• ⁎ 
  Corresponding author.

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