INFLUENCE OF FLY ASH AND RUBBER IN CONCRETE

(M20 GRADE) BY (BATCH-7)

ABHISHEK.K(11241A0132)

REDDY

PRASHANTH(12245A0117)

BHARADWAJ.S(11241A01A9)

MD.FAISAL

FARZAN(11241A0195)

NITHIN REDDY.B(11241A0166)

PROJECT GUIDE:

Mr. V.MALLIKARJUNA REDDY

DEPARTMENT OF CIVIL ENGINEERING

ABSTRACTThe results of an experimental investigation to study the effects of partial

replacement of cement with flay ash in rubberized concrete. The percentage of rubber used in this study was 5% replaced with coarse aggregate and fly ash varies from 0-20% were replaced with cement in conventional concrete. One size of tire rubber chips are used of about 10mm.The mix design was targeted to be M20 grade of concrete. The mix proportion of concrete was 1:1.5:3 with water cement ratio of 0.45.The fresh and hardened properties of rubberized concrete produced at two different replacements ratios of fly ash compared to the conventional concrete without rubber and fly ash .The test result indicate that there was a small reduction in the strength with the 5% replacement in rubber content as compared with the conventional concrete. However, the increase of fly ash from 10% to 20% improved the mechanical properties of rubberized concrete. This study explores the effects of rubber particles on some properties of concrete.

Key words: Fly ash, rubber, coarse aggregate, fine aggregate, cement

INTRODUCTION

Concrete is one of the main component in any

concrete masonry construction

Concrete composes of cement ,fine aggregate,

coarse aggregate

Researches have shown that these components

can be replaced to some extent by fly ash,

rubber, plastic, stone dust etc..,

Waste or worn out rubber can be used as

replacement to the coarse aggregate to about

5% instead of disposing it out as waste material

(from "influence of fly ash on mechanical

properties of rubberized concrete” by

M.Mishra,K.C.Panda)

Fly ash to be replaced to about 20% of cement.

Studies are made on both fresh as well as

hardened properties of rubberized concrete and

compare with normal concrete.

NEED FOR REPLACEMENT

Growth of cement usage leads to the greater

production of CO gas which is one of the major

cause for GLOBAL WARMING2

Excavation of sand and stones from river banks is

one of the main cause for disasters caused due to

FLOODS

REPLACING MATERIALS Materials like rubber, fly ash, stone dust, waste

materials, etc.., Can be used to replace

aggregates and cement

But these materials cannot be replaced fully but

they are partially replaced to about 5% to 20%

(by “influence of fly ash on mechanical

properties of rubberised concrete” by

M.Mishra,K.C.Panda).

Their strength would not be as high as the

traditional concrete but this can be used for

domestic concrete works.

USING WASTE TYRE RUBBER IN CONCRETE

The disposal of waste or worn out tyres have

become a global problem

It is a potential fire hazard and as well as health

risks due to growth of mosquitoes breed in

stagnant water which accumulates in tyres

Rubber from scrap tyres is one of the most

recent waste materials investigated for its

potential use in construction industry

MATERIALS USEDFLY ASH Fly ash is finely divided residue obtained from

the combustion of powdered coal

CLASS F fly ash from thermal power plants

collected and is used for about 5%to 20%to

replace cement.

10% and 20% replacement of cement

specimens have been prepared.

WASTE TYRE RUBBER

Bike tyre is trimmed into pieces of about 10 mm

size by means of wood cutter and by using knifes.

This rubber would be used to replace for about 5%

with course aggregate(as per “influence of fly ash

on mechanical properties of rubberized concrete”

by M.Mishra,K.C.Panda.)

Two waste bike tyres from nearby puncher shop

has been collected for the project

PROCESS OF CUTTING RUBBER

CEMENT Ordinary Portland cement (53 grade) Ultratech

cement is used

COARSE AGGREGATE

Normal coarse aggregate of 20 mm size is used

FINE AGGREGATE River sand which is available locally is used as

fine aggregate for entire process

GRADE OF CONCRETE The mix is targeted for M20 grade(Nominal

mix).

WATER-CEMENT RATIO Water-cement ratio is be taken as 0.45.

SPECIMENS PREPAREDCONCRETE MIX PROPORTION

MIX IDENTITY NO. OF SPECIMENS

Concrete mix with 100%NCA+100%cement+0%rubber+ 0%fly ash

CR0F0 6

95%NCA+90%cement+5%rubber+10%fly ash

CR5F10 6

95%NCA+80%cement+5%rubber+20%fly ash

CR5F20 6

QUANTITY OF MATERIALS USEDMIX IDENTITY(kg)

NO. OF BLOCKS

CEMENT(kg)

SAND(kg)

NORMAL COARSE AGGREGATE(NCA)(kg)

RUBBER CHIPS(kg)

FLY ASH (kg)

WATER(ml) (w/c ratio =0.45)

CR0F0 6 10 15 30 -- -- 4500

CR5F10

6 9 15 28.5 1.5(5% replacement of NCA)

1(10%replacement to cement)

4500

CR5F20

6 8 15 28.5 1.5(5% replacement of NCA)

2(20% replacement to cement)

4500

TESTS CONDUCTED

FRESH CONCRETE TEST

Slump cone test

HARDENED CONCRETE TEST

Compressive strength test

Slump cone test

TEST RESULTS

S.NO

MIX IDENTITY SLUMP

VALUE(mm)

1 CR0F0 45

2 CR5F10 40

3 CR5F20 43.5

Slump cone test values

Slump chart

CR0F0

CR5F10

CR5F20

3.7 3.8 3.9 4 4.1 4.2 4.3 4.4 4.5 4.6

SLUMP

SLUMP

Compressive strength test

MIX PROPORTION MIX IDENTITY

AVERAGE COMPRESSIVE STRENGTH

7 DAYS 28 DAYS

Concrete mix with 100% NCA

+ 100% Cement + 0% Rubber chips + 0% FA

CR0F0 17.96 23.70

Concrete mix with 95% NCA + 90% Cement + 5% Rubber chips + 10% FA

CR5F10 15.23 19.04

Concrete mix with 95% NCA + 80% Cement + 5% Rubber chips + 20% FA

CR5F20 18.09 23.80

Compressive strength test results

CR0F0 CR5F10 CR5F200

5

10

15

20

25

7 days

28 days

Compressive strength variation for 7 &28 days

(N

/mm

^2)

OBSERVATIONS

The workability decreases when we replace

coarse aggregate with 5% rubber and cement

by 10% fly ash

Again the workability increases as greater

percentage of fly ash increases the workability

The strength of concrete decreases with

increase in percentage of fly ash first and again

increases as the percentage of fly ash increases.

REFERENCES/LITERATURE “Influence of fly ash on mechanical properties

of rubberized concrete” by M.Mishra,K.C.Panda. “Rubber tyre particles as coarse aggregate” by

N.N.Eldin ,A.B.Senouci ,journal of materials in civil engineering,vol-5,pp.478-96.

I.B.Topcu,(1995),”The properties of rubberized concrete", cement concrete research,vol.25(2),pp.304-310.

A.Yilmaz&N.Degirmenci,(2009),”Possibility of using waste tyre rubber and fly ash with Portland cement concrete as construction materials", waste managements,vol29(5),pp.1541-1546.