Using ultrasonic wave to study modulus of elasticity, shear modulus and poissons's ratio of polymer concrete.

Chemistry and Materials Research www.iiste.org
ISSN 2224- 3224 (Print) ISSN 2225- 0956 (Online)
Vol.6 No.8, 2014
Using Ultrasonic Wave to Study Modulus of Elasticity, Shear
Modulus and Poissons's Ratio of Polymer Concrete.
Meethaq M. Abed1*
1. Karbelaa Technical Institute, Foundation of Technical Education, Iraq.
* E-mail: mee1sa2012@gmail.com
Abstract
The main aim of this study is assess the modulus of elasticity , shear modulus and Poissons's ratio of polymer
concrete (PC).Polymer concrete is a composite material realized with resin and aggregates.The Unsaturated
polyester composite resin was used for binding the aggregates. The silica foam and glass fibers were introduced
in the composition as filler.Some mechanical properties of polymer concrete have been investigated, by non-destructive
method. The experimental results of ultrasonic wave at 26 KHz test were correlated with, modulus of
elasticity, shear modulus and Poissons's ratio. The fiber percentage and silica foam was constant, the unsaturated
polyester resin and the Silica sand dosages were varied.The results showed that by increase the percentage of
sand aggregate (%W) in all groups the Poissons's ratio,Pulse Velocity,Modulus of Elasticity and Shear Modulus
are increased.
Keywords: Shear Modulus, Polymer Concrete, Modulus of Elasticity, Poissons's ratio,Ultrasonic wave.
1. Introduction
The work in this investigation was planned in order to obtain further information about the effect of addition of
Silica sand to the Unsaturated polyester resin on the some mechanical properties of PC such as modulus of
elasticity, shear modulus and Poissons's ratio .PC has been used for decades in engineering construction like
machine foundations, in the building industry for façade products and sanitary parts, in electrical engineering for
isolation devices and especially in the chemical industry for all types of ducts due to favorable properties,
especially its corrosion resistance as well as its strength and elasticity [Lang G. 2005].PC is a composite material
in which resin is used as binder for aggregates such as Sand or gravel instead of Portland cement [Castello X,
Estefen S. 2008]. PC is an inert product that can be cast in almost any shape [Zou G.P, Taheri F. 2006]. Due to its
rapid setting, high strength properties and ability to withstand a corrosive environment. It is increasingly being
used as an alternate to cement concrete in many applications, construction and repair of structures, highway
pavements, bridge decks, waste water pipes and decorative construction panels[Garas Victor Y, Vipulanandan
C.1998]. However, the growing need for durable materials to replace portland concrete, particularly with regards
to chemical strength properties, has not been translated into widespread usage of PC.The most likely reasons
behind this are a lack of information on the properties of PC, the technology employed in its production and its
higher cost. The major cost component in these materials is the resin used in their production [E.B.
Mano,1991].The importance in assessing the modulus of elasticity of the PC compositions in this study stems
from the fact that this property is one of the most important characteristics of these materials. There are also
polymers with low modulus of elasticity values (classified as thermoplastics) which, if used in PC compositions,
can result in low modulus of elasticity values in the final product. However, as the polyester resins used in the
production of PC are dissolved in a styrene monomer, cross-linking occurs during polymerization and a
tridimensional reticulate structure (a thermoset) results. This thermosetting polymer is insoluble, infusible and
displays improved mechanical properties when compared with thermoplastics. These characteristics require the
use of different technologies in the mode of application of these polymers[Jane P. Gorninski, Denise C. Dal
Molin, Claudio S. Kazmierczak. 2004].Typical properties of polymer concrete are given in Table (1-1).The three
compositions in this study used fixed concentrations.This concentrations are (85,65,55,40,25%) unsaturated
polyester resin of all specimens group and (15,35,45,60,75%) sand as a aggregate in group-1 and (4%) silica
foam as a filler with (11,34,41,56,71%) sand in group-2 and (1%) fiber glass with (4%) silica foam and
(10,25,40,55,70%) sand in group-3.This filler is used between aggregate and silica foam and also in different
concentrations to provide a more comprehensive assessment of the effect of silica foam on the elasticity modulus
of PC compounds.
2.EXPERIMENTAL PORGRAM
2.1. Materials
2.1.1 Resin
Unsaturated polyester resin (UPS) was used as the matrix in the preparation of composite material polymeric
and manufactured by the (Industrial Chemical of resins Co. LTD) in Saudi Arabia. This resin transforms from
liquid to solid state by adding (Hardener) and this hardener is manufactured by the company itself and it is a
(Methyl Ethyl Keton Peroxide) coded (MEKP) and be in the form of a transparent liquid. It is added to the
41

Vol.6 No.8, 2014
unsaturated polyester resin 1% percent at room temperature, and in order to increase the speed of hardening,
catalyzer materials on interaction is used as a catalyst (Catalyst) called accelerators.Cobalt Napthenate which
are mixed directly with the resin and manufactured by the same company.
2.1.2 Aggregate
Aggregate used in PC with gradation of 0-2mm,2-8mm and 8-16mm. In this research,we used it between 0-
2mm.Silica sand is the main component of the polymer Concrete used in this study. It is brought from (General
Company for Mechanical Industries in Al-Eskandria ).
2.1.3 Filler
Silica foam is used as filler in order to achieve chemical resistance, impact and erosion strength and to increase
bonding between matrix and reinforcement phase. Silica foam was brought from "Nippon AEROSIL CO. LTD
JAPAN, NFPA, NO.77-1984".
2.1.4 Fibers
In this research glass fibers used from type (E-Glass) as strengthening phase in the form of choppy glass fibers,
average diameter of filament for this choppy glass fibers is (4–6 μm ) and with length is (10-15 mm ).These
fibers provided by (Mowding LTD. UK)English Company.
2.2 Moulds for Plate
The moulds used for casting of the specimens comprised of a square steel frame measureing 50*50*50 mm by
ASTM C579 – 01 Method –B (see fig.1).
2.3. Samples Design
By rule of mixture, design of mixtures for all groups are showed in the following manner:-
GROUP-1: Samples for studying the effect of silica sand particles volume fraction with particle size rang (300μm
≥ p.s > 74μm).
GROUP-2: The effect of particle size and volume fraction for silica sand particles on UPS matrix with added
4% silica foam (0.02-0.5 μm) for all samples.
GROUP-3: Samples with different volume fractions of silica sand and adding percent of silica foam is 4% at
(0.02-0.5 μm) and fiber glass 1%. Samples these groups are designed as shown in table (1-2).
2.3 Method
The test of static modulus of elasticity, shear modulus and Poissons's ratio was performed using ultrasonic pulse
velocity test ( U.P.V ) to find longitudinal and transverse velocity (VL , VT ) respectively.To find the values of
static modulus of elasticity, shear modulus and Poissons's ratio we used equations (1,2,3):
Poissons's Ratio (ѵ) ѵ = (1-2(VT/VL)2) / (2-2(VT/VL)2) ……..(1)
2 ρ (1+ ѵ) (1-2 ѵ) / (1- ѵ) ………(2)
42
Static Modulus of Elasticity
(KN/mm2 )
E = VL
Shear Modulus (KN/mm2 ) G = VT
2 ρ …………………………......(3)
3.Results and discussion
The results obtained in the ultrasonic wave test are presented and discussed in this section.
3.1 Non–Destructive Test( Ultrasonic Pulse Velocity test ( U.P.V ))
The cubes samples were tested using non-destructive methods namely ultrasonic pulse velocity test. The
Ultrasonic pulse velocity was measured by an ultrasonic concrete tester ( CSI ), type cc – 4 at 26 KHz.The test
method is prescribed by BS. 1881 : part 203 : 1986 specifications (see Fig 2).
Fig.3 shows effect of Fillers on Pulse velocity for all concentrations.The results summarized in Fig.3 show that
high pulse velocity values were obtained in group-2 because adding silica foam as filler which leads to chemical
bond between sand and binder. As a result, increasing of pulse velocity.When adding fiber glass (group-2) we
showed slightly low in values because the fiber glass hinders formation of chemical bond.
3.2 Poissons's ratio
Fig.4 shows variation of Poissons's ratio with Pulse velocity for all concentrations.The results summarized in
Fig.4 show that Poissons's ratio values increase with increasing pulse velocity for all groups.In this figure,The
maximum value Poissons's ratio is 0.2 nearly of all groups.This value decrease to reach -0.2 in group-1, -0.55 in
group-2 and -1 in group-3.This decline of values indicates that the decreasing of adhesion properties between
strengthening and matrix phases.

Vol.6 No.8, 2014
3.3 Modulus of Elasticity
Fig.5 shows variation of Modulus of Elasticity with percentage of fillers for all concentrations. The results
summarized in Fig.5 show that Modulus of Elasticity values increase with increasing percentage of fillers for all
groups.In this figure,the maximum values of Modulus of Elasticity are (0.0023, 0.0025 (KN/mm2)) nearly of
group-2 and group-3 respectively while the value of Modulus of Elasticity is (0.0015 (KN/mm2)) of group-1.In
general,increasing percentage of fillers leads to increase of Modulus of Elasticity because load distribution on
the fillers particles and matrix.
3.4 Shear Modulus
Fig.6 shows variation of Shear Modulus with percentage of fillers for all concentrations.The results summarized
in Fig.6 show that Shear Modulus values increase with increasing percentage of fillers for all groups.In this
figure,the maximum value Shear Modulus is (0.11*10-5 (KN/mm2)) nearly of group-2 while the value of Shear
Modulus is (0.3*10-6,0.62*10-6 (KN/mm2)) of group-1and group-3 respectively.In general,increasing fillers leads
to increase of Shear Modulus because transformation of the stress from matrix to particales.
5. Conclusion
There was an increase in Pulse Velocity as concentrations of percentage of fillers increased and an increase in
Poissons's ratio as pulse velocity increased.The maximum value of Poissons's ratio is 0.2 and then decreasing
values to -1 and -0.55 in group-2 and group-1 respectively.High modulus of elasticity values were obtained and
the peak value was 0.0025 (KN/mm2).These values are approach to those observed in group-2.High shear
modulus values were obtained and the peak value was 0.11*10-5(KN/mm2) and then decreasing values to
(0.3*10-6,0.62*10-6 (KN/mm2)) in group-1 and group-3 respectively.
References
Castello X, Estefen S.,(2008),"Sandwich Pipes for Ultra Deepwater Applications " COPPE/UFRJ, Department of
Ocean Engineering, Offshore Technology Conference,Houston,Texas,USA, 5-8 May.
E.B. Mano, (1991),"Polı´meros como materiais de engenharia" Edgard Blucher, Sa˜o Paulo, 197 pp. Jane P.
Gorninski, Denise C. Dal Molin, Claudio S. Kazmierczak.,(2004)," Study of the modulus of elasticity of polymer
concrete compounds and comparative assessment of polymer concrete and Portland cement concrete" , cement
and concrete research,2091-2095. Garas Victor Y, Vipulanandan C.,(1998),"Review of
Polyester Polymer Concrete properties ", Center for Innovative Grouting Materials and Technology (CIGMAT),
University of Housten, Department of Civil and Environmenta Engineering.
Lang G.., (2005), "Case histories of polymer concrete application in the US: pipes, manholes, structures ",North
American Society for Trenchless Technology (NASTT),Orlando, Florida,April 24-25.2007. Walter O.
Oyawa., (2005)," Steel encased polymer concrete under axial compressive loading: Analytical formulations" ,
Construction and Buliding Materials, Elsevier,volume 21,Issue 1, January 2007,P 57-65. Zou G.P, Taheri
F.,(2006),"Stress analysis of adhesively bonded sandwich pipe joints subjected to torsional loading"Dalhousie
University,Department of Civil Eng.,International Journal of Solids and Structures,volume 34,Issue 20, P5953-
5968.
Figure 1. Moulds and Specimens
43

Vol.6 No.8, 2014
Fig.(2): Ultrasonic Pulse Velocity device.
Figure 3: Effect of Fillers on Pulse velocity for all groups.
Figure 4: Variation of Poissons's ratio with Pulse velocity for all groups.
44

Vol.6 No.8, 2014
Figure 5: Variation of Modulus of Elasticity with Fillers for all groups.
Fig 9: Variation of Shear Modulus with Fillers for all groups.
Table 1-1: Physical Properties of some of Polymer Concrete[Walter O. Oyawa. 2005].
Table (1-2):Samples design.
45
Material
NO
UPS
(%W)
Group-1 Group-2 Group-3
Silica sand
(%W)
Silica sand+4% Silica
foam
(%W)
Silica sand+4% Silica
foam+1%fiber glass
(%W)
1 85 15 11 10
2 65 30 26 25
3 55 45 41 40
4 40 60 56 55
5 25 75 71 70

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