A. S. TAIWO et al.: MECHANICAL PROPERTIES AND WATER-ABSORPTION CHARACTERISTICS OF SELECTED ...
97–104
MECHANICAL PROPERTIES AND WATER-ABSORPTION
CHARACTERISTICS OF SELECTED NATURAL FIBERS AS A
REPLACEMENT FOR ASBESTOS
MEHANSKE LASTNOSTI IN ABSORBCIJA VODE IZBRANIH
NARAVNIH VLAKEN KOT ZAMENJAVA ZA AZBEST
Anuoluwapo Samuel Taiwo
1
, Emmanuel Oseremen Egbodion
1
, Adeolu Adesoji Adediran
2*
,
Samuel Akinyemi Shittu
1
, Samuel Olufemi Balogun
3
, Olanrewaju Seun Adesina
2
1
Department of Metallurgical and Materials Engineering, Federal University of Technology, Akure, PMB 704, Ondo State, Nigeria
2
Department of Mechanical Engineering, College of Engineering, Landmark University, PMB 1001, Omu-Aran, Kwara State, Nigeria
3
Department of Science Laboratory Technology, Ogun State Institute of Technology, Igbesa PMB 2005, Igbesa, Ogun State, Nigeria
Prejem rokopisa – received: 2020-06-22; sprejem za objavo – accepted for publication: 2020-09-17
doi:10.17222/mit.2020.118
This work investigates the influence of banana (Musa Sapientum) and jute fibers as a reinforcement in a cement/waste brown
paper pulp matrix for applications in housing construction in Nigeria. The natural fibers were extracted from banana trunk and
cocoa sack and, thereafter, treated with 1-M sodium hydroxide (NaOH) for2htoe xpose the lignin and cellulose and thus ex-
pose the hemicellulose content of the fibers. The treated fibers were allowed to dry in air for 7 days before cutting into short fi-
bers of 10 mm length. Paper pulp was prepared by soaking waste brown cardboard papers in water for 24 h, thereafter, it was
grinded in the paper pulp machine to form a paper pulp slurry, and then sun-dried for 5 days. The treated fibers were thoroughly
mixed with the dried paper pulp to develop Fiber Cement Board (FCB) samples of varied weight content (5, 10, 15, and 20) w/%
using the hand lay-up technique with the aid of a cold compacting machine. Thereafter, an appropriate quantity of cement as
binder and treated sugarcane bagasse as filler material were added to the mix. The developed FCB samples were allowed to cure
in air in the laboratory for 28 days before testing. Flexural, compressive, thermal conductivity, and water absorption tests were
carried out on the samples using a universal testing machine, Lee's disk apparatus, and the percentage weight of different im-
mersed samples in water, respectively. The results of the mechanical properties examined showed that FCB sample D containing
(10 w/% banana fiber, 10 w/% jute fiber, 15 w/% cement/bagasse and 65 w/% paper pulp) gave the optimum results for the flex-
ural and compressive properties with a respective value of 0.843 MPa and 7.333 MPa, while FCB sample F gave the best results
for the thermal conductivity and water-absorption property.
Keywords: natural fibers, waste papers/cement matrix, mechanical properties, Housing construction
V ~lanku avtorji opisujejo raziskavo izdelave kompozitnega materiala, uporabnega za hi{ne konstrukcije v Nigeriji. Material so
izdelali iz vlaken bananovca (Musa Sapientum) in jute kot oja~itev za ka{nato matrico iz cementa in odpadnega rjavega papirja.
Naravna vlakna so pridobili iz debel bananovca in jute iz vre~ za kakav. Sledila je njihova dveurna obdelava v 1M natrijevem
hidroksidu (NaOH) za sprostitev lignina in celuloze. Na ta na~in so iz vlaken izlo~ili lignin in hemicelulozo. Obdelana vlakna so
su{ili sedem dni na zraku in jih nato razrezali na kratka vlakna dol`ine 10 mm. Papirnato ka{o so pripravili s 24-urnim
namakanjem rjavega kartonskega papirja v vodi. Sledilo je drobljenje v stroju za izdelavo papirnate ka{e . Nastala je go{~a, ki so
jo pet dni ponovno su{ili na soncu. Obdelana vlakna so dobro preme{ali s posu{eno papirnato pulpo (5, 10, 15 in 20) w/% in kot
vezivo dodali primerno koli~ino (15 mas. %) cementa in obdelani trsni sladkor. Iz te mase so izdelali preizku{ance; to je
cementne plo{~e, oja~ane z naravnimi vlakni. Pred testiranjem so vzorce su{ili na zraku v laboratoriju {e 28 dni. Na
univerzalnem preizku{evalnem stroju so nato dolo~ili upogibno in tla~no trdnost vzorcev. Poleg tega so dolo~ili {e njihovo
toplotno prevodnost z Leejevim preizku{evalnim aparatom in absorpcijo vode. Vzorci ozna~eni s ~rko D, ki so vsebovali 10
mas. % vlaken bananovca, 10 w/% vlaken jute, 15 w/% cementa/sladkorja in 65 w/% papirne pulpe so imeli optimalno upogibno
(0,843 MPa) oziroma tla~no trdnost (7,333 MPa), medtem ko so imeli vzorci F najmanj{o toplotno prevodnost in absorpcijo
vode.
Klju~ne besede: naravna vlakna, matrica iz odpadnega papirja in cementa, mehanske lastnosti, konstrukcija ostre{ja
1 INTRODUCTION
The increasing interest in the application of natural
fibers in the area of composite materials development is
undisputable. This is primarily due to sustainability, as
well as their appreciable mechanical properties and low
cost.
1–3
The changes perceived amongst diverse natural
fibers are owing to their climatic conditions, chemical
composition and origin.
4
Normally, plant fibers are com-
posed of 10–20 % of hemicellulose, 5–15 % of lignin,
60–70 % of cellulose and approximately2%ofpectin
and waxes.
1
Banana fiber is gotten from the overlaid
leaves forming the quasi-trunk of the plant, which pres-
ently has not been put to any significant use in Nigeria,
except for a very low fraction devoted to livestock feed-
ing, which is less than2%ofthetotal produce of banana
fibers in the country. It, however, falls into the Musa spe-
cies, as a monocotyledonous plant. Banana is one of the
most significant crops planted in Sahara Africa,
5
which
made it the most important producers of banana in Af-
rica. It is imperative to point out here that fibers are ob-
tained from the quasi-trunks of the plant after the fruit
Materiali in tehnologije / Materials and technology 55 (2021) 1, 97–104 97
UDK 67.017:677.1:676.017.66:677.511 ISSN 1580-2949
Original scientific article/Izvirni znanstveni ~lanek MTAEC9, 55(1)97(2021)
*Corresponding author's e-mail:
adediran.adeolu@lmu.edu.ng (Adediran Adeolu)

has been garnered, moreover, each plant bears fruit only
once in its entire life cycle. This is one of the key bene-
fits of banana fibers in contrast with other natural fibers,
as this one is gotten from an agricultural waste.
6
Jute fi-
ber on the other hand, is extracted from cocoa sack by
unweaving the knitted cocoa sack to obtain long strands
of jute fiber.
7
Authors
3
investigated the changes occur-
ring in jute fibers after 5 % NaOH solution treatment for
different periods of (0, 2, 4, 6, and 8) h. A 9.63 % weight
loss was measured during2ho ft h etreatment with a
drop of hemicellulose content from 22 % to 12.90 %.
The tenacity and modulus of the treated fibers improved
by 45 % and 79 %, respectively, and the breaking strain
was reduced by 23 % after 8 hr of treatment. The
crystallinity of the fibers increased only after 6 hr of
treatment. It was also reported that the impact fatigue be-
haviour of vinylester matrix composites reinforced with
untreated and alkali-treated jute fibers showed that a lon-
ger duration of the alkali treatment increased the
crystallinity and gave a better fiber dispersion due to the
removal of hemicellulose, while the alkalization for 4 h
was the optimum treatment time to improve the interfa-
cial bonding and fiber strength. Furthermore, the flexural
strength of the alkali-treated jute fiber composites was
higher than that of untreated jute fiber composites.
5,7
The
practice of using natural fibers in the strengthening of
polymeric parts has been extensively studied, particu-
larly focusing on injection-molding technology. It is re-
ported that an approximate 21,000 tons of natural fibers
were used in European industry in 2003.
1
In another re-
port, the essential fibers for the industrial manufacturing
of polymeric composites are sisal, hemp and flax fi-
bers.
1,5
Furthermore, research has shown that natural fibers
have little or no detrimental effect on the environment,
humans, and machinery, thus being considered as a close
substitute for asbestos and glass fiber.
8
Some research
has also been carried out to understand the compression
molding technique, with a view to strengthening its us-
age in natural-fiber-reinforced composite development,
some with elongated fibers and others with entwined fi-
bers, both for thermoplastic and thermosetting polymers.
These studies revealed that certain mechanical properties
of natural-fiber-reinforced composites were comparable
with those reinforced with glass fiber, though the me-
chanical properties under moist conditions demonstrate a
significant decrease in the natural fiber composites, due
to their nature being hydrophilic or moisture absorbent.
6
However, it has been established that the mechanical
properties of composites strongly hinge on the alignment
of the fibers, resulting in enhanced properties when the
fiber is knitted and positioned in the composite in a
proper orientation. Interestingly, several researches have
been done on the manufacturing of natural-fiber-rein-
forced composite materials using fibers such as jute,
hemp, and flax in knitted and un-knitted forms; however,
little or no research has been found to report the use of
banana fibers to develop composite materials. Further-
more, only a few researches have reported the use of ba-
nana fibers to produce yarns for technical textile prod-
ucts.
1
Banana fibers consist of 11 % lignin, 14 %
hemicellulose, 43.6 % cellulose and other substances
(such as pectin and waxes) making up the remaining
31.4 %.
4,7
Chemical methods for fiber extraction are
commonly performed with NaOH, although other chemi-
cals (such as stearic acid, benzoyl chloride, KMnO
4
among others) can also be used.
7,9
These processes may
however, result in ecological problems as a result of the
need to treat the remains produced. The mechanical
methods are not capable of eliminating the lignin
(non-cellulosic constituents). An alternative method is
the use of organic processes, such as the immersed
10
or
solid-state
11
fermentations. Enzymatic approaches are
considered to be more ecologically friendly and circum-
vent the fibers' fracture, while altering the properties of
the cellulosic fibers.
12
Consequently, certain factors
might influence the choice of enzymes, this includes:
lignin content, composition, type of substrate, size, etc.
12
Previous studies revealed that pectinase
13
and xylanase
14
are the most appropriate enzymes for fiber extraction.
However, enzymatic approaches have been applied to
pineapple, flax or hemp for fiber treatment. Celluloses
are applied to eliminate fibrils from the surfaces of the fi-
bers and improve the surface smoothness of the fiber.
15
Moreover, this treatment might also destroy the fibers
and weaken their mechanical properties.
15
The present
study investigates the influence of banana (Musa
Sapientum) and jute fibers as reinforcement in ce-
ment/waste brown paper pulp matrix with potential ap-
plications in housing construction (particularly intended
for areas such as internal roofing/ceiling and partition-
ing) in Nigeria.
2 EXPERIMENTAL PART
2.1 Materials
The banana and jute fibers used in this present study
were gotten from the stem of a plant obtained at
Apatapiti layout, FUTA south gate, Akure, Ondo State,
Nigeria, and cocoa sack obtained from Oja Oba market
in Akure, Ondo State, Nigeria. The agricultural waste
(sugarcane bagasse) was obtained locally from already
sucked sugar cane, The Portland cement matrix used in
the study was gotten from Apatapiti layout, FUTA south
gate, Akure, Ondo State, Nigeria. The reagent sodium
hydroxide (NaOH) used for the treatment of the fibers
was obtained from Pascal's Scientific Limited, Akure,
Ondo State. The distilled water used in this work, was
obtained from the Department of Chemistry, Federal
University of Technology, Akure, Nigeria.
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98 Materiali in tehnologije / Materials and technology 55 (2021) 1, 97–104

2.2 Methods
2.2.1 Extraction of fibers
Banana fibers were extracted manually from the
quasi-trunk of the plant after the fruit has been harvested;
thereafter, the quasi-trunk of the plant was subjected to
water retting process by soaking it in distilled water,
which allowed the swelling of the trunk and loosening of
the strands of the fiber. The loosened strands were ex-
tracted manually from the water-retting process and then
sun-dried for 3 days, as shown in Figures 1a and 1b,
prior to chemical treatment using NaOH solution. Jute fi-
bers were extracted from cocoa sack by unweaving the
knitted cocoa sack to obtain long strands of jute fiber, as
shown in Figure 2b, before the chemical treatment with
NaOH solution.
2.2.2 Preparation of paper pulp
Paper pulp was prepared by first soaking waste
brown carton paper in water for 24 h in order to soften it
and make it easy for the fibers to separate from each
other and also to reduce the grinding time; this was in
agreement with previous work.
16
Thereafter, the soaked
paper was charged into the paper pulping machine and
allowed to grind for about 10–15 minutes to obtain paper
pulp slurry, which was then sun dried for 5 days before
using it to develop the fiber cement boards.
2.2.3 Treatment of fibers with 1-M NaOH
The extracted banana and jute fibers were treated
separately with 1-M NaOH solution, which was prepared
in the laboratory by weighing 40 g of NaOH pellet into
1000 ml of distilled water. The treatment was done at
room temperature for 2 h to expose the soluble lignin
and cellulose and attack the hemicellulose content from
the surface of the fibers. In this way, the interfacial bond-
ing strength between the fibers and the matrix is im-
proved.
6
The treated fibers were allowed to dry in air at
room temperature for 7 days before cutting into short fi-
bers of 10 mm to give room for good adhesion of the fi-
bers with other constituent materials, which was used for
the development of the fiber cement boards.
2.2.4 Production of fiber cement boards or composite
samples
Natural-fiber-reinforced composite samples were de-
veloped using the compression-molding technique. A
predetermined proportion of fibers, paper pulp, and ce-
ment matrix was mixed vigorously in a plastic mold in
other to obtain a homogeneous mixture due to the differ-
ent proportions. The production was carried out at room
temperature. The mixed proportion was poured into
compression, flexural, and thermal conductivity molds.
The filled mold was then placed in between the lower
and the upper plates of the cold-compression machine at
room temperature for 2 min under an applied pressure of
0.2 kPa. In this way, composite samples filled with vary-
ing weight fractions of natural fibers (5, 10, 15, and
20) w/% were produced while using teflon sheet to cover
the top and bottom part of the mold for easy release after
molding. Figures 2a to 2b shows the composite samples
produced for flexural and thermal conductivity tests re-
spectively.
A. S. TAIWO et al.: MECHANICAL PROPERTIES AND WATER-ABSORPTION CHARACTERISTICS OF SELECTED ...
Materiali in tehnologije / Materials and technology 55 (2021) 1, 97–104 99
Figure 2: Showing a) flexural samples, b) thermal conductivity samples
Figure 1: Showing a) sun dried strands of banana fiber, b) strands of jute fibers unwoven from cocoa sack

Table 1: Composition/percentage weight for composite samples
(flexural, compressive, and thermal conductivity)
Sample
designation
Matrix
(paper pulp)
w/%
Reinforcement
(jute/banana)
w/%
Binder
(cement)
w/%
Control (O) 100 – –
A8 5–1 5
B 65 20/– 15
C 65 15/5 15
D 65 10/10 15
E 65 5/15 15
F 65 –/20 15
2.3 Characterization and water-absorption properties
The various mechanical tests carried out on the devel-
oped composite samples are as follows:
2.3.1 Compressive test
A compressive test is generally carried out on cylin-
drical samples to determine the compressive modulus,
compressive strength at peak, and compressive strength
at the break of the samples were determined using an
Instron 5966 tester with a load cell of 10 kN in accor-
dance with the standard.
17
2.3.2 Flexural test
The flexural strength of the composite was evaluated
by performing flexural three-point bending test on the
composite. The test was performed at room temperature
using Testometric Universal testing Machine operated at
a crosshead speed of 3.0 mm/min. The test procedure
and the flexural strength determination were performed
in accordance with the standard.
18
2.3.3 Thermal conductivity
Thermal conductivity is the measure of the heat
passed through a material at a given temperature. The
thermal conductivity was determined using Lee’s disk
apparatus.
19
The time at each temperature interval is re-
corded and used in calculating the value of k using Equa-
tion (1).
k
mc d T/ t
AT T
=
−
p
()
()
∂∂
12
(1)
where K is the thermal conductivity (W/mK), m is the
mass of the disk (kg), and C
p
is the specific heat capac-
ity of the metal (kJ/kgK) as presented in Equation (2):
∂TTT =− (( )
12
)K (2)
A is the area (m
2
) and t is the time (s).
2.3.4 Water-absorption test
The water-absorption test for the developed compos-
ite samples was carried out in accordance with ASTM
D570-10, a standard test method for the water absorption
of plastics.
20
Composite samples were weighed and im-
mersed in distilled water at room temperature. The
weight of the samples prior to immersion was taken as
W
1
. The samples were then taken out and weighed at 24
h intervals for up to 5 days. This was after water satura-
tion in all the samples had been observed. The samples
were weighed immediately after wiping out the water on
the sample surface. The readings were taken with a digi-
tal weighing balance and the weight of the samples after
immersion was taken as W
2
. The percentage water ab-
sorption was calculated using Equation (3).
6
W
WW
W
A
(%)
()
=
−
×
21
1
100 (3)
Where W
1
is the initial weight of the sample prior to
immersion (g), W
2
is the weight of the sample after 24 h
of immersion (g), W
A
is the percentage of absorption.
From Equation (3), the graphs of weight gain vs. im-
mersion time, percentage water absorption vs. immersion
time were plotted.
3 RESULTS
The representative variations of the flexural proper-
ties are as shown in Figures 3 to 5, respectively. The
flexural modulus is presented in Figure 6, while Figures
7 and 8 show the compressive properties. The variation
in the composites compressive moduli are as shown in
Figure 9. The thermal property variations are in Figures
10 to 13, showing the variation in the weight gained, the
percentage of water absorption and the SEM images for
samples A and D, respectively.
Table 2: Weight gained and immersion time of the composite samples
for the water-absorption test
Immersion time (h)/weight gained
Samples
designation
24 h 48 h 72 h 96 h 120 h
O 1.646 1.761 1.779 1.785 2.062
A 1.423 1.501 1.557 1.558 1.629
B 1.649 1.721 1.782 1.799 1.963
C 1.499 1.596 1.625 1.664 1.665
D 1.485 1.649 1.705 1.753 1.799
E 1.461 1.617 1.663 1.677 1.777
F 1.213 1.311 1.375 1.378 1.466
4 DISCUSSION
Figure 3 shows the variation of the flexural strength
at the peak with the composite samples. It was observed
that all the composites samples with fiber reinforcement
showed a better flexural strength at the peak than the
control sample 'O', which has no fiber addition. This
demonstrates that the addition of the selected natural fi-
bers contributed to the improved flexural strength at the
peak of the composite samples. However, the optimum
flexural strength at the peak was observed in the FCB
sample 'D' with 10/10 w/% of jute/banana (JB) fibers
with a value of 0.84343 MPa. This can be attributed to
the equivalent percentages of fiber addition and the dis-
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100 Materiali in tehnologije / Materials and technology 55 (2021) 1, 97–104

tribution between the JB fibers within the paper pulp/ce-
ment matrix. Furthermore, the FCB sample 'B' with a
single reinforcement of 20/0 w/% JB fibers content with
a value of 0.77946 MPa; tend to give a better result when
compared with sample F having a single reinforcement
of 0/20 w/% JB fibers. This suggests that jute fiber was
more responsible for the improved strength in the com-
posite. Although a gradual increase in the percentage of
banana fiber resulted in an increase of the flexural
strength at the peak of the composite sample, as ob-
served in sample D. This trend, however, agrees with
previous findings,
21
which reported that the flexural
strength of composites could increase with a gradual in-
crease in the percentage of reinforcement. Figure 4
shows the variation of flexural strength at the break with
composite samples. It was also observed that all the
composites samples with fiber reinforcement had better
flexural strength at the break, compared to the control
sample 'O', which had no fiber addition. It is evident that
the addition of the selected natural fibers has contributed
to the improved strength of the composite samples.
Moreover, the optimum flexural strength at the break
was observed in the FCB sample 'D' with 10/10 w/% of
JB fibers with a value of 0.7473 MPa. This may be at-
tributed to the equal percentages of fiber addition and
distribution between the jute/banana fibers within the pa-
per pulp/cement matrix. A similar trend was observed for
composite samples with individual fiber reinforcement
evident in FCB sample B, and F with 20/0 and 0/20 w/%
of JB fibers content with a value of 0.73623 MPa and
0.42723 MPa, respectively. However, sample 'E' with
5/15 w/% of JB fibers content gave the minimum flexural
strength at break with a value of 0.34676 MPa. This can
be attributed to the lower percentage of jute fiber in the
composite sample, which resulted in the poor flexural
strength at the break property. Figure 5 shows the varia-
tion in flexural strength at yield with composite samples.
A similar trend was observed for all the collections of
FCB samples. It was noted that the flexural strength at
yield was optimum in sample 'D', which has 10/10 w/%
of JB fibers as reinforcement content with a value of
0.84343 MPa. This was followed by FCB sample 'B'
with 20/0 w/% of JB fibers content with a value of
0.77946 MPa. However, the composite sample 'E' with
5/15 w/% of JB fibers content gave the least result with a
value of 0.43855 MPa.
From the result in Figure 6, it was observed that the
FCB composite sample 'D' with 10/10 w/% of JB fibers
showed the best flexural modulus with a value of 0.029
MPa. This gave a very high stiffness and rigidity when
compared to the control sample 'O' with a value of 0.02
MPa. Afterwards, there seems to be a linear decrease in
the flexural modulus of the FCB composite samples as
the percentage of jute fiber reduces. This showed that the
treated banana fiber can be abruptly responsible for the
enhanced flexural modulus of the composite samples.
The seeming drop in the flexural modulus showed by
samples 'B' and 'C' may be due to a factor such as fiber
pulling. Fiber pulling occurs occasionally as a result of
experimental imperfections that reduce the fiber distribu-
tion and/or dispersion. Since good fiber distribution has
been known to promote good interfacial bonding, and re-
A. S. TAIWO et al.: MECHANICAL PROPERTIES AND WATER-ABSORPTION CHARACTERISTICS OF SELECTED ...
Materiali in tehnologije / Materials and technology 55 (2021) 1, 97–104 101
Figure 4: Flexural strength at the breaking point of the composite
samples
Figure 3: Variation of the flexural strength at the peak with the com-
posite samples
Figure 6: Flexural modulus of the composite samples
Figure 5: Flexural strength at the yield point of the composite samples

duce voids by ensuring that filler agglomerate is fully
surrounded by the matrix, thereby giving room for the
improved flexural modulus. The variations in the com-
pressive strength at peak for the developed FCB compos-
ite samples is as presented in Figure 7. It is evident from
the chart that a gradual increment in the compressive
strength at the peak of the composite sample was ob-
served from 10/10 w/%, 5/15 w/% and 0/20 w/%. The JB
fibers content had a compressive strength value of
(1.6756; 1.6877 and 1.7836) MPa, respectively. Further-
more, it was observed that the composite sample 'F'
which has 0/20 w/% JB fibers had the optimum result for
the compressive strength at the peak with a value of
1.7836 MPa. This might be attributed to the higher per-
centage of treated banana fiber that was responsible for
the optimum result in the composite sample. Figure 8
shows the variation in compressive strength at break with
composite samples. It is inferred that the composite sam-
ples D, E, and F with fiber reinforcement had a better
compressive strength at the break compared to the con-
trol sample 'O', which had no fiber addition. This shows
that the addition of the selected natural fibers contributed
to the improved strength of the composite samples. It
was observed that an optimum compressive strength at
the break was recorded in the FCB sample 'D' with 10/10
w/% of JB fibers with a value of 2.102 MPa. This can
also be attributed to the equivalent percentages of fibers
addition and distribution between jute/banana fibers
within the paper pulp/cement matrix. This was followed
by FCB sample 'F' with 0/20 w/% of JB fibers content
with a value of 1.7836 MPa. However, sample 'C' with
15/5 w/%of JB fibers content gave the minimum com-
pressive strength at the break with a value of 0.8276
MPa. This can be due to the lower percentage of banana
fiber in the composite sample, which resulted in the poor
compressive strength at the break.
From the result in Figure 9, it was also observed that
the FCB composite sample 'D' with 10/10 w/% of JB fi-
bers showed the best compressive modulus with a value
of 7.333 MPa. This showed a very high stiffness and ri-
gidity value when compared with the control sample 'O',
with a value of 6.667 MPa. However, there appeared to
be a linear decrease in the compressive modulus of the
FCB composite samples as the percentage of jute fiber
reduces. It is inferred that the treated banana fiber was
abruptly responsible for the enhanced compressive
modulus of the composite samples. Thermal conductivity
is a measure of the ability of a material to conduct heat.
Heat transfer occurs at a lower rate in materials of low
thermal conductivity than in materials of high thermal
conductivity. The thermal conductivity of the material
can depend on the temperature. The thermal conductivity
of the developed FCB composite samples is shown in
Figure 10.
A representative plot showing the thermal conductiv-
ity of composites samples is as presented in Figure 10.It
is revealed that the composite samples with individual fi-
ber addition; i.e., samples 'B' and 'F', gave a respective
value of 0.129 W/mK and 0.111 W/mK. These appeared
to be the optimum results; an indication that there seems
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102 Materiali in tehnologije / Materials and technology 55 (2021) 1, 97–104
Figure 10: Variation of the thermal conductivity with the composite
samples
Figure 9: Variation of the compressive modulus with the composite
samples
Figure 8: Variation of the compressive strength at the breaking point
with the composite samples
Figure 7: Variation of the compressive strength at the peak with the
composite samples

to be a high rate of heat conduction due to high level of
dispersion of the individual fibers within the paper
pulp/cement matrix. This trend was in agreement with
the work of,
22
which reported that the thermal conductiv-
ity of composites was found to have increased with an
increase in the volume fraction of thermally conductive
filler. However, composite samples with 5/15 w/% and
15/5 w/% JB fibers showed minimum results for the ther-
mal conductivity with a respective value of 0.051W/mK
and 0.040 W/mK. This reduction in the thermal conduc-
tivity can be attributed to the presence of combined JB
fibers in the composite samples. This implies that the
best thermal conductivity can be achieved mainly in
composite samples with an individual fiber addition.
The representative variation in weight gained is as
displayed in Figure 11. It was observed that the water
absorption with the composites increases with immersion
time, although the rate of absorption decreases with in-
creased time. It is also noticed that the water absorption
attains equilibrium after 120 h. At this stage, the com-
posites were observed to have attained the saturation
point as far as water absorption is concerned. However, it
was noted from Figure 12 that the amount of water ab-
sorbed by the composite samples showed a sinusoidal
wave pattern, i.e., increases/decreases as the fiber con-
tent in the composites changes. The percentage water ab-
sorption for the control and sample A, which has no fiber
addition as shown in Figure 12, are 1.806 % and
1.533 %, respectively. It is evident from the results that
less absorption took place in composite sample F with
0/20 w/% jute/banana fiber content with an average value
of 1.348 %, followed by composite sample C with
15/5 w/% JB fibers content with a value of 1.609 %. This
showed that composite samples with individual fiber
content (in this case banana fiber) absorbed less water
when compared with composite samples having both fi-
ber contents. Authors
23
reported that the water-absorp-
tion property of polymer matrix composites reinforced
with natural fiber, particulate and their derivatives, is de-
pendent on the amount of the fiber/particulate, the fiber
orientation or the degree of particles dispersion, immer-
sion temperature, and the area of the exposed surface to
water. The morphology of the developed composites was
examined using a scanning electron microscope (SEM)
and the results revealed that composite samples without
any fiber addition. Figure 13a has a noticeable level of
fine and coarse aggregate of paper pulp/cement matrix as
well as microcavities, which cannot be seen in the com-
posite sample with jute/banana fiber addition Figure
13b. This shows that the fiber addition was able to fill
the cavities, which were not seen in the FCB sample D in
Figure 13b, as reported by
24,25
the mechanical treatment
given to the fibres was also responsible for the good in-
terfacial bonding formed at the fibre/matrix and/or fi-
ber/fiber interface as observed in Figure 13b. Further-
more, the good interfacial bonding between the fibres
and the matrix also contributed to the improved mechani-
cal properties observed in the composite sample D, as re-
ported previously in this research.
A. S. TAIWO et al.: MECHANICAL PROPERTIES AND WATER-ABSORPTION CHARACTERISTICS OF SELECTED ...
Materiali in tehnologije / Materials and technology 55 (2021) 1, 97–104 103
Figure 12: Percentage of water absorption of the composite samples
Figure 11: Plot showing the variation in the weight gained for the
composites samples
Figure 13: a) SEM image for sample A, b) SEM image for sample D

5 CONCLUSIONS
Based on the current studies involving the use of se-
lected naturally occurring fiber such as jute and banana
fiber to serve as reinforcing material in paper pulp/ce-
ment-based composites. The following conclusions were
drawn:
a) FCB sample D with 10 w/% jute and 10 w/% ba-
nana fiber content has the best flexural strength with a
value of 0.84343 MPa, followed by 20 w/% jute with a
value of 0.77946 MPa. Although the incorporation of
both fiber contents causes an enhancement in the flexural
strength at yield of all the composites developed, but it
was discovered that the jute fiber was more responsible
for the improved strength when the FCB samples B and
F with individual fiber content were compared.
b) The amount of water absorbed by the composites
increases with the increase in the fiber content. This is
due to the agglomeration of the fibers within the com-
posite at higher fiber loading, which led to cracks and the
formation of cavities at the fiber-matrix interphase,
which allow the transmission of water into the composite
at higher fiber loadings.
c) A fiber cement board composite sample D with
10 w/% jute, and 10 w/% banana fiber in combination
with 15 w/% cement/bagasse and 65 w/% paper pulp can
be used to develop a composite material which may
serve as a close substitute for asbestos in housing con-
struction in Nigeria.
Acknowledgment
The authors appreciate Landmark University Centre
for Research, Innovation and Development (LUCRID)
through SDGs-9 (Industry, Innovation and Infrastructure)
for their support.
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