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SIGNIFICANCE OF RUBBER MIX
CONCRETE
INTRODUCTION
The main purpose of this research is to investigate the
potential of rubberised concrete to be used in
structural applications as structural concrete
...
Nevertheless, it should be analysed how
much the rubber affects the main properties of
concrete in small percentage of substitution especially
the compressive strength
...
Through the experimental procedure the basic
properties of rubberised concrete are analysed
carrying out conclusions on how these properties
could be negative or positive for future potential
applications
NEED TO STUDY
Disposal of waste tyres is becoming a major waste
management problem
...
2 billion of waste tyre rubber is produced globally
per year
...
Micro–organisms may take more than 100 years to
biodegrade them
...
Waste tyres disposal areas contribute to the reduction
of biodiversity also the tyres hold toxic and soluble
components
...
OBJECTIVES
Alternative way of recycling tyres
...
To enhance the understanding of rubber concrete
properties
...
To evaluate the possible advantages of using rubber in
concrete
...
Vamshi krishna, J
...
38% to 16
...
1% to 0
...
As the fiber content is increased from 0
...
3% in weight of cement there is an increase in
the split tensile strength from 12
...
78%
compared to the conventional concrete at 28 days
...
The test results for compressive strength, fourpoint flexural bending, elasticity modulus and
fatigue life on RRAC showed that the compressive
strength of recycled aggregate concrete (RAC)
increased by 10
...
An analysis of the damage characteristics
showed that both recycled aggregate and
rubber particle could enhance the concrete’s
fatigue life
...
Porous concrete pavement
is being used as one of the solutions to
decrease the stormwater runoff by capturing
and allowing rainwater to drain into the land
surface
...
From the literature, the best procedure is by using
the standard Proctor hammer(2
...
TOMAS U
...
Human hair is strong in tension and can be used as a
fibre reinforcement material
...
Adding of both cement
and human hair to asphalt mixture improves the load
bearing capacity of the mixture and exhibits superior
resistance to both deformation and fatigue
...
Our review focused on SIW represented by rubber tires and
plastics as tow very effective modifiers for the improvements
of asphalt pavement material
...
ABDESSSEMED
Airport flexible pavements are subjected during their use to
continuous stresses from mainly dynamic repeated aircraft loads,
environmental climatic conditions and hence the risk of fatigue and
deterioration
...
An experimental study was made by measuring deflections by HWD
on flexible asphalt runway, before and after strengthening by geogrid,
to monitor its short-term behavior by measurement of deflections
and tensile stresses
...
RoadCem is a fine powder containing alkali metals and
synthetic zeolites which are complemented with a
complex activator ,two different mixes determined the
effect of adding RoadCem in terms of compressive and
flexural strengths, breaking strain, thermal expansion
and contraction behavior, permeability using a falling
head, and Young’s modulus
...
DINESH KUMAR
This paper emphasizes the effect of molasses the
byproduct from sugar industries
...
The
binding properties of molasses will reduce the
water content in concrete mix to enhance the
properties of concrete
...
1% the compressive strength of
concrete also increased
...
The compressive
strength of concrete measured for both admixtures after
7 and 28 days The only reason for improvement of
strength was bonding
...
Segregation and bleeding is less due to admixture and
initial and final setting time is delayed by use of
molasses and jaggery as compare to sugar and lingo
sulphate as admixture
NAVEEN, SUMIT BANSAL
Replacement of cement by rice husk ash
showed inM30 grade concrete compressive
strength improvement up to the replacement of
10% in all ages
...
Rice husk ash levels of
15 to 20% showed reduction in compressive
strength in all ages
MATERIALS USED
1
...
Coarse Aggregate
3
...
Rubber
CEMENT
A cement is a binder, a substance that sets
and hardens and can bind other materials
together
...
Hardens early
...
An excellent building material
...
Good moisture-resistant
...
76mm
...
COARSE AGGREGATE
Naturally occurring, processed or
manufactured, inorganic particles in prescribed
gradation or size range, the smallest size of
which will be retained on the 4
...
RUBBER
Chipped Rubber The rubber has a
dimension of about 25-30 mm
...
CRUMB RUBBER
These particles are highly irregular, in the
range of 3–10 mm
...
ASH RUBBER
The rubber consists of particles smaller than 1
mm
...
It could be used as a filler in
concrete due to its size
...
Therefore
the mix design is generally carried out for a
particular compressive strength of concrete
with adequate workability so that the fresh
concrete can be properly mixed, placed and
compacted
...
More is the fineness of cement
more will be the rate of hydration
...
b)Soundness
Soundness is the ability of a hardened paste
to retain its volume after setting
...
e
...
Unsoundness of
cement is due to presence of excessive
amount of hard-burned free lime or
magnesia
...
d)Initial and Final Setting Time
“Initial setting time is that time period between the
time water is added to cement and time at which 1
mm square section needle fails to penetrate the
cement paste, placed in the Vicat’s mould 5 mm to 7
mm from the bottom of the mould”
...
2)TESTS OF AGGREGATE
a)
Aggregate Abrasion Test
This test helps to determine the abrasion
value
of
coarse
aggregates
...
7mm, Abrasive charge – 12 nos
...
and each weighing between
390 and 445g ensuring that the total
weight of charge is 5000 +25g and Oven
...
The
apparatus used for determining aggregate
impact value of coarse aggregates is Impact
testing machine Sieves of sizes – 12
...
36mm, A cylindrical metal
measure of 75mm dia
...
c)Aggregate Crushing Test
This test helps to determine the aggregate
crushing value of coarse aggregates as per
IS: 2386 (Part IV) – 1963
...
5mm, 10mm and 2
...
Slump test as
per IS: 1199 – 1959 is followed
...
b)Compressive Strength of Concrete
The tests are required to determine the
strength of concrete and therefore its
suitability for the job
...
As expected, the higher the rubber content in
the mix, the higher the reduction in
compressive strength
...
b)Relation Between Stress and Strain for
different Rubber Content
With increase in the crumb rubber the tensile
strength decreases
...
The split tensile strength of the concrete
decreases about 30% when 20% sand is
replaced by crumb rubber