Department of Civil Engineering
Poojya Doddappa Appa
college of Engineering, Kalaburagi – 585102, Karnataka, India
Abstract:- This paper presents the ductile characteristics of hybrid
Ferro cement slab incorporating polypropylene fibres and GFRP sheet. A total
of 9 slab have been tested under two point flexural loading. The size of the
slab is 1000 mm(length) x1000 mm(width) x 60 mm(thickness). The parameters
studied in this investigation includes the number of weld mesh layers,
polypropylene fibres i.e (0.3%) and GFRP sheet. from the studies, it is
observed that the load carrying capacity and deformation. The stiffness of the
specimens with zero layer weld mesh is lower than that of the specimens with
two layers and three layers bundled. Further, there is reduction in number of
cracks with increase in fibre content.
Keyword:- Ferrocement Slabs, GFRP Wrapping, Fibre Reinforcement,
Ductility Factors, Crack Pattern
I.
Introduction
The development of new technology in the material science is
progressing rapidly. In recent two or three decades, a lot research was carried
out throughout globe for how to improve the performance of concrete in terms of
strength and durability qualities. consequently concrete has no longer remained
as a construction material. A new material consisting of wire meshes and cement
mortar called ferrocement. it is one of the construction materials which may be
able to fill the need for building light structures. ferrocement composite
consist of cement-sand mortar and single or multi-layers of steel wire mesh to
produce elements of small thickness having high durability, and when properly
shaped it has high strength and rigidity. These thin elements can be shaped to
produce structural members such as folded plates, flanged beams, wall pane,. etc
for use in the construction of cheap structures. Ferro
cement elements are generally more ductile when compared to conventional
reinforced concrete elements but post peak portion of load- deflection curve in
bending test of Ferro cement elements reveals that failure occur either due to mortar failure in compression
or due to failure of extreme layers of mesh.
From the above discussions, it can be noted that, research work out on
the ductile behavior of hybrid ferrocement slab with fibre. The present
Investigation is aimed at to investigate the ductile behavior of hybrid
ferrocement slabs with and without Considering the effect of fibres. Compared with the
conventional reinforced concrete, ferrocement is reinforced in two directions;
therefore, it has homogenous-isotropic properties in two directions. Benefiting
from its usual high reinforcement ratio, ferrocement generally has a high
tensile strength and a high modulus of rupture. In addition, since the specific
surface of reinforcement in ferrocement is one to two orders of magnitude
higher than that of reinforced concrete, larger bond forces develop with the
matrix resulting in average crack spacing and width more than one order of
magnitude smaller than in conventional reinforced concrete (Shah and Naaman
1997, Guerra et al 1978). Other appealing features of ferrocement include ease
of prefabrication and low cost in maintenance and repair. Based on the
abovementioned advantages, the typical applications of ferrocement are water
tanks, boats, housing wall panel, roof, formwork and sunscreen (Nimityongskul
et al 1980 and Kadir 1997).. Ferrocement over the years have gained respect in terms of its
superior performance and versatility. Ferrocement is a form of reinforced
concrete using closely spaced multiple layers of mesh and/or small diameter
rods completely infiltrated with, or encapsulated in, mortar. In 1940 Pier
Luigi Nervy, an Italian engineer, architect and contractor, used ferrocement
first for the construction of aircraft hangars, boats and buildings and a
variety of other structures. It is a very durable, cheap and versatile
material.
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