Light weight self compacting concrete

1. LIGHT WEIGHT SELF COMPACTING CONCRETE
INCORPORATING POLYSTYRENE, PERLITE AND SCORIA
GUIDED BY
Dr. BIJU LONGHINOS PRESENTED BY
ZAMEER NABI WANI
S5C1
ROLL NO. 70

2. CONTENTS :-
 Introduction
 Self Compacting Concrete-advantages and
disadvantages
 Light Weight Self Compacting Concrete:-
 Incorporated materials
 Conclusion

3. INTRODUCTION:-
 Self Compacting Concrete(SCC) is a highly
fluid form of concrete that can consolidate
under its own weight.
 Light weight Concrete (LWC) is the concrete
which incorporates the use of lightweight
aggregates .
 Light weight self compacting concrete
(LWSWCC) is the combination of both SCC
and LWC, that aims to combine benefits of
both the concretes

4. SELF COMPACTING CONCRETE:-
 By the early 1990s ,Japan has developed and
used SCC
 Self-compacting concrete(SCC) is a highly
workable concrete that can flow and
consolidate under its own self weight without
the use of mechanical vibration.
 It is primarily used to decrease construction
time , ensure sufficient compaction, moreover
to eliminate noises associated with
mechanical vibration.

5. PROPERTIES OF SCC
 Filling ability(excellent deformability)-flows easily
into formwork.
 Passing ability-passes through reinforcements
without blocking.
 High resistance to segregation-the distribution
of aggregate particles remains homogeneous in
both vertical and horizontal direction.
 This resistance to segregation is mainly due to
the high viscosity and counter effect of fine
particles in the admixture.

6. ADVANTAGES OF SCC
 Elimination of problems associated with
vibration
 Faster construction
 Improves working conditions and productivity
in construction industry
 Ease of placement results in cost savings
through reduced equipment and labour
requirement
 Reduced wear and tear on forms from
vibration

7. DISADVANTAGES OF SCC
 More precise measurements and monitoring
of the constituent materials.
 High cost of the materials necessary to
produce SCC
 More stringent requirements on the selection
of materials
 The resulting high unit weight of SCC is the
main problem

8. LIGHT WEIGHT SELF COMPACTING CONCRETE
 Light weight self compacting concrete
(LWSCC) is the combination of Light weight
concrete(LWC) and Self compacting concrete
(SCC).
 This concrete offers engineers greater
freedom when it comes to design efficient
concrete structures with respect to project cost
and time.
 The addition of Light Weight Aggregates
(LWAs) in concrete to produce LWC can result
in a higher strength-to-weight ratio.

9. Cont…..
 The enhanced thermal and fire resistance is
achieved.
 Considerable reduction in dead load is
achieved.

10. INCORPORATIVE MATERIALS USED IN LWSCC
1) POLYSTYRENE:-
 Polystyrene is the main constituent of electronic
plastic waste from outdated computers and their
accessories.
 Disposing this waste into construction materials is an
eco-friendly and efficient solution to protect the
environment.
 It has been found the strength of SCC increases by
replacing the some proportion of sand/coarse
aggregate with electronic waste, namely, High Impact
Polystyrene(HIPS) plastic granules.

11. Cont…
 Polystyrene is termed as the Building System
Technology(BST).
 Up to 30 percentage of HIPS replacement for
sand is desirable.
 If the above limit exceeds there may have
some problems like segregation of SCC, as
HIPS is ultra light in weight.

12. EXPERIMENT DONE BY THE UNIVERSITY
OF WESTERN AUSTRALIA

13. POLYTSYRENE MIXED WITH AGGREGATES OF
CONCRETE

14. 2) PERLITE:-
 Perlite is an amorphous volcanic glass that has
relatively high water content(2-5%).
 It occurs naturally and has the property of
greatly expanding when heated sufficiently.
 Because of its insulating characteristics and low
weight it is used as aggregate in LWSCC.
 The compressive strength values of LWSCC
decrease with increase in Perlite aggregate
content from 0% to 80%.
 This decrease in compressive strength is due to
the lower strength and porosity of perlite.

15. Cont…
 It has been found that the compressive strength
values increased as the curing period increased
from 3 to 28 days.
 The unit weight of concrete can be significantly
reduced by replacing natural aggregate by
expanded perlite aggregate(EPA).
 The unit weight can be reduced from 1710
kg/m^3 at 0% of EPA to 560 kg/m^3 at 80% of
EPA.
 It also increases the thermal insulation of
LWSCC.

16. AVAIL ABLE FORMS OF PERLITE AGGREGATE

17. 3) SCORIA:-
 Scoria is a rock of volcanic origin, with basic
composition of basalt.
 It is light weighted and strong enough to be
used as light weight aggregate.
 LWSCC containing scoria aggregates ,
provides engineers and construction industry
with an alternative for conventional concrete
because of it reduced self weight.
 Also , concrete produced using scoria
aggregates can insulate heat 5 to7 times better
than conventional concrete.

18. Cont…
 The average density decreases as the
percentage of coarse aggregate replacement
with scoria increases.
 The average density of 2584 kg/m^3 at 0% of
scoria reduced to 800 kg/m^3 at 100% 0f scoria
aggregate.
 Water absorption increased with increase in
scoria as a replacement to coarse aggregate in
concrete.

19. SCORIA STONE
Crushed form of scoria stone

20. MANUFACTURING
SITE OF LWSCC
AGGREGATES
A 54 storey building
constructed

21. CONCLUSION:-
 Polystyrene is eco-friendly and economical.
 There is a problem associated with segregation
which can be checked by adding specific
binders.
 Perlite provides good insulation effect in LWSCC.
 Scoria also provides insulation effect.
 Scoria is a good absorbent of water.
 All the three incorporative aggregates reduces
the dead load of LWSCC.

22. REFRENCES:-
 Abdelaziz, G. E.
 Abouhussien
 A. A. A. Hassan
 M. K. Ismail.
 ACI (American Concrete Institute). 2003. Guide for
structural lightweight aggregate

23. THANKYOU !