polymer concrete fiber reinforced concrete U-BOOT technology boncrete

1. WE’RE GLAD
YOU’RE
HERE B Y
K . H Y D E R A L I
B . A R U N K U M A R R E D D Y
F R O M
TECH

2. CONTENTS
Polymer concrete
Fibre reinforced concrete
U-BOOT technology
Boncrete

3. WHY WE CHOSEN THOSE CONCRETE
C O N V E N T I O N A L
C O N C R E T E DEFECTS
 High self weight
 Low tensile
 Low impact
 Low fatigue
 Bleeding
 permeability
 Micro cracks are formed
even before loading

4. POLYMER CONCRETE
Introduction
Types of polymer concrete
Properties
Advantages
Disadvantages
Applications

5. INTRODUCTION
 concrete is porous
 The porosity is due to air-voids, water voids or due
to the inherent porosity of gel structure itself.
 Reduces strength.
 reduction of porosity results in increase of strength
of concrete
 vibration, pressure application spinning ,none of
these methods could really help to reduce the water
voids and the inherent porosity of gel, which is
estimated to be about 28%.

7. TYPES OF POLYMER CONCRETE
Polymer concrete
Polymer impregnated concrete
Polymer cement concrete
Partially impregnated and
surface coated polymer concrete

8. POLYMER CONCRETE
 Polymer concrete is a mixture of
aggregate with a polymer as the
sole binder.
 There is no other bonding material
present. i.e.:- Portland cement is
not used
 To minimize the void volume in
aggregates ,we use graded
aggregates and also to reduce the
quantity of polymer needed for
binding aggregates

9. PREPARATION OF POLYMER CONCRETE
Silane
coupling
agent
aggre
gates
monome
r

10.  An important reason for development of this
material is the advantage it offers over
conventional concrete
 In the usage of alkali portland cement on
curing forms internal voids due to these voids
cracks are formed , due to presence of alkali it
can easily by chemically aggressive materials
 Whereas polymer concrete reduces the voids
and resist chemical attack and makes the
concrete high strength within short curing
period

11. POLYMER IMPREGNATED CONCRETE
 A polymer impregnated concrete is one of the
widely used polymer composite.
 It is prepared when the precast conventional
concrete cured and dried in oven or by dielectric
heating from which the air in the open cell is
removed by vaccum.
 Then low viscosity monomer is diffused through
open cell and polymerised by using radiation,
application of heat or by chemical reaction

12. MONOMERS USED:
Acrylonitrile
Styrene
 Based upon volume of voids, the quantity
of monomer decided

13. POLYMER CEMENT CONCRETE
Polymer cement concrete is made by mixing
cement, aggregates, water and monomer.
 it doesn't give much strength and durability as
expected due to in compatible with aqueous
systemur
Russian authors had found that furfuryl alcohol
and aniline hydrochloride in wet mix gives
- high dense - high corrosion resistance - non
shrinkage
- low permeability - high resistance to
vibration

14. MONOMERS USED IN PCC
1.Polyster-styrene
2.Epoxy-styrene
3.Furans
4.Vinylidene chloride

15. PARTIALLY IMPREGNATED AND SURFACE COATED
 Partially impregnation may be sufficient in situation when the
major requirements is surface resisting against chemical and
mechanical attack
 It is produced by initial soaking of dried specimen in liquid
monomer, then sealing them by keeping under hot water at 70 c
 Polymerisation can be done by using thermal catalytic method ,
in which benzoyl peroxide is added to monomer as a catalyst
 Depth of monomer penetration is depends on following
1. pore structure
2. duration of soaking
3. viscosity of monomer

16. HOW TYPICAL SURFACE TREATMENT IN FIELD CAN BE DONE
1. The surface is dried with electrical heating blanket
2. Remove blanket and cover slab with 0.64 m3 oven dried
light weight aggregates per 100 sq.m
3. Apply initially 2000 to 3000 ml of monomer per sq.m
4. Cover the surface with polyethylene to retard evaporation
5. Add periodically additional monomer to keep aggregate
moist for 8 hours
6. Apply heat to polymerise the monomer , heating blanket ,
steam or hot water can be used for this purpose

17. MONOMERS USED IN THIS CONCRETE
 Methylmethacrylate
 Isodecyl methacrylate
 Isobutyl methacrylate
 Trimethylopropane trimethacrylate

18. PROPERTIES OF POLYMER CONCRETE
Stress strain relationship compressive
strength

19. Tensile strength
It increases as 3.9 times that of control specimen for a
polymer loading of 6.4% MMA, it means impregnated concrete
have shown tensile strength of order of 11.6 mpa compared to
strength of control specimen of 3 mpa
Flexural strength
With polymer loading of 5.6% MMA and
polymerised by radiation have shown flexural
strength 3.6 times more than that of the control
specimen

20. Creep
Compressive Creep deformation of MMA impregnated concrete and
styrene—
impregnated concrete has been observed to be in direction opposite to that of the
applied
load i.e., Negative Creep. After the typical initial movement during load application,
these
concretes expand under sustained compression
Shrinking due to Polymerisation
Shrinkage occurs through two stages of impregnation treatment i.e., through
initial drying and through polymerisation.
 Water Absorption
A maximum reduction of 95 per cent in water absorption has been
observed with concrete containing 5.9 per cent polymer loading.

21. ADVANTAGES
Rapid curing at ambient temperatures
Good resistance against corrosion
High tensile ,flexural and compressive
strengths
Good adhesion to most surfaces
Good Long term durability
Good chemical resistance
Low permeability

22. DISADVANTAGES
The binder is more expensive than cement
Some safety issues arise out of the use of
polymer concrete.
The monomers can be volatile,
combustible, and toxic.
which are used as catalysts, are
combustible and harmful to human skin.

23. APPLICATIONS
 Used for industrial structures and rehabilitation.
 Solid surface countertops for modern kitchens
and baths.
 It can be used for manufacturing electrical poles.
 Prefabricated structural elements.
 Commonly used in areas subject to heavy wear
and high loadings such as car parks, roadways
and industrial areas.
 Marine works and nuclear power plants

24. FIBRE REINFORCED CONCRETE
Introduction
Types of fibres
Factors affecting properties of FRC
Advantages
Disadvantages
Application

25. INTRODUCTION
 Fiber is a small piece of reinforcing material which
increases structural integrity.
 Main role of fibres is to bridge the cracks that
develop in concrete and increases the ductility of
concrete materials
 Fibers include steel fibers, glass fibers, synthetic
fibers and natural fibers.
Why Fibre ?
Concrete:
• Weak in tension
• Brittle

26. TYPES OF FIBRES
1.Steel fibers
2.Glass fibers
3.Plastic fibers
4.Carbon fibers

27. STEEL FIBRES
 They are generally
round.
 The diameter may vary
from 0.25 mm to 0.75
mm.
 Use of steel fiber
makes significant
improvements in
flexural impact
strength of concrete.

28. GLASS FIBRES
 Glass fiber is made up from
2000 - 4000 individual
filaments which are lightly
bonded to make up a stand.
 It is not possible to mix more
than about 2% (by volume) of
glass fibers up to a length of
25mm.
 Glass fiber reinforced concrete
is mostly used for decorative
application rather than
structural purposes.

29. PLASTIC FIBRES
 Fibers such as polypropylene ,
nylon and polyethylene have high
tensile strength but low young’s
modulus thus inhibiting reinforcing
effect.
 The amount of plastic fibers added
to concrete is about 0.25 to 1
percent by volume.
 Polypropylene and nylon fibers are
found to be suitable to increase the
impact strength.

30. CARBON FIBRES
 Carbon fiber comes under
the low modulus of
elasticity and high flexural
strength.
 Their strength & stiffness
characteristics have been
found to be superior even to
those of steel.
 These have the high tensile
strength between 2100 –
2815 N/mm2

32. FACTORS AFFECTING ON FRC
1.Volume of fiber
2.Size of coarse aggregate
3. Mixing of fibres
4.Aspect ratio
5.Orientation of fibres

33. 1.Volume of fibers
It has been found that increase in volume of fibers .
1.Decrease in workability
2.Not easy to compact
2. Size of coarse aggregate
investigations showed that the maximum
size of the coarse aggregate should not exceed 10
mm, to get the concrete into workability.

34. 3. Mixing
To avoid segregation we need to use fibres less
than 2% of total volume of concrete
4.ASPECT RATIO
 L/DIA
 30 – 70 linear
 70 – 150 strength decreases
 Micro fibres are effective

35. 5.ORIENTATION OF FIBRES
_ _ _ _ _ _ _ _ _ _ _ _
_ _
_ _ _ _ _ _ _ _ _ _ _ _
_ _
Parallel
| | | | | | | | | | | | | |
| | | | | | | | | | | | | |
vertical
/ / / / / / / / / / / /
/
/ / / / / / / / / / / /
/
random

36. ADVANTAGES OF FRC
Improves toughness of concrete
Flexural strength is improved by up to 30%
by decreasing the propagation of cracks
Improvement in bond strength
Reduction in shrinkage and cracking
Lower permeability of concrete

37. DISADVANTAGES OF FRC
Low Modulus of Elasticity
More Expensive than Steel
Corrossion
Unable to compact easily
Low workability

38. APPLICATIONS OF FRC
1.Precast products
2.Water retaining structures
3.Air field slabs (runways)
4.Pavement and floors
5.Culvert , bridge deck

39. U-BOOT TECHNOLOGY
Introduction
Process
Advantages
Applications

40. INTRODUCTION
 In 2001 an Italian engineer, Roberto Il Grande,
developed and patented a new system of hollow
formers, in order to decrease the transportation costs
(and CO2 production). The U-Boot formwork is a
modular element made of re-cycled plastic for use in
building lighter structures in reinforced concrete cast
at the work-site The biggest advantage of U-boot is
reduce the concrete quantity
 U-boot earliest projects were executed in 2002
and
since that time it has been used all over the world

41. WHY WE GO FOR U-BOOT
 The main disadvantage of concrete
constructions, incase of horizontal
slabs, is the high weight which
limits the span.
 For this reason, basic research in the
field of reinforced concrete structures
have focused on enhancing the span,
either by reducing the weight or
overcoming concrete's natural
weakness in tension.

42. PLACING OF U-BOOT SHELL

43. COMPARISON BETWEEN ORDINARY AND U-BOOT
STRUCTURE

44. ADVANTAGES
 U boot made up of recycled plastics
 U boot is used for the floor slab or foundation slab
 It is easy design ,easy technical ,economical
 Light weight and thickness of slab reduced
 Stress is discharged to directly to the beam slab
and the load is distributed to column directly and
foundation
 Fire resistance

45. BONCRETE
BONE POWDER MIXING WITH
CEMENT

46. PREPARING OF CONCRETE CUBES