ECO-FRIENDLY CONCRETE INNOVATION WITH SHELL ASH AS SUBTITUTE

NUR DHINI LESTARI 5113413056

CONCRETE

What is Concrete ?

What is the advantages of concrete ?

Does concrete has disadvantages ?

PORTLAND CEMENT AS ONE OF CONCRETE MATERIAL MIXTURE

HAS SOME DISADVANTAGES

Limestone mining process

PORTLAND CEMENT AS ONE OF CONCRETE MATERIAL MIXTURE

HAS SOME DISADVANTAGES

Cement production process polluting the environment

And the solution is. . .

ECO-FRIENDLY CONCRETE

Green environment

Shells ash

The benefits

Eco-friendly concret

e

WHY SHELL ?

Amount of shell is abundant

Few amount of shells are only made to traditional craft

WHY SHELL ASH ?

Shell contains pozzolanic chemical compound

Burn the shell until grey and fragile

Anadara Granosa

Filter the ash shell until we get the fine

gradation that resembles portland

cement

HOW TO OBTAIN SHELL ASH?

Jenis Bahan Persen (%)

Batu Kapur (CaO)

Pasir Silikat (SiO2)

Tanah Liat (Al2O3)

Bijih Besi (Fe2O3)

Magnesia (MgO)

Sulfur (SO3)

Soda/Potash (Na2O+K2O)

60-65

17-25

3-8

0,5-6

0,5-4

1-2

0,5-1

Composition of portland cement

Sumber: Teknologi Beton, Kardiyono, 1996

Composition of shell ash

Sumber: Pengaruh Substitusi Abu Kulit Kerang terhadap Sifat Mekanik Beton, Rezeki, S. A. & Karolina, Rahmi, 2013

KOMPONENKADAR ABU KULIT KERANG (%

BERAT)

CaO 55,1038

SiO2 0,924

Fe2O3 0,0017

MgO 0,9475

Al2O3 1,2283

MATERIALS NEEDED TO PRODUCE A SAMPLE OF CONCRETE ARE:

Tiga Roda PCC cement

MATERIALS NEEDED TO PRODUCE A SAMPLE OF CONCRETE ARE:

Coarse agregat in 20 mm gradation

MATERIALS NEEDED TO PRODUCE A SAMPLE OF CONCRETE ARE:

Fine aggregat which obtained from Muntilan sand

MATERIALS NEEDED TO PRODUCE A SAMPLE OF CONCRETE ARE:

Shell ash

TOOLS NEEDED TO PRODUCE A SAMPLE OF CONCRETE ARE:

Pail Sieve number 200 Scales with 0,05 gram accuracy Concrete mixer (molen) Cilindrical mold with 15cm x 30 cm

dimension Digital compression machine (ELE

International 36-3090/01)

THE RESULT OF CONCRETE SAMPLES TESTING

0% 5% 10% 15% 20%

Komposisi Limbah abu kulit kerang

39.63 33.59 38.61 31.86 31.11

2.5

7.5

12.5

17.5

22.5

27.5

32.5

37.5

Com

pre

ssio

n S

trength

(M

Pa)

BUDGET PLAN FOR 1 M CUBIC CONCRETE WITH SHELL ASH

SUBSTITUTION

Construction materials prices in Semarang, on March 2015

No Material Vol Satuan Harga Satuan Jumlah

1. Tiga Roda cement 405 Kg Rp. 1.300,- Rp. 526.500,-

2. Muntilan fine aggregate 708 Kg Rp. 89,- Rp. 63.012,-

3. Water 180 Liter Rp. 5,- Rp. 900,-

4. Coarse aggregate 20 mm 1062 Kg Rp. 117,- Rp. 124.254,-

5. Shell ash 45 Kg Rp. 0,- Rp. 0,-

Total Rp. 714.666,-

THE CONCLUSIONConcrete with shell ash substitution has

optimum compression strength 38,61 MPa with addition 10% of shell ash composition. Besides, price of concrete with shell ash subtitute is 40% cheaper than normal concrete K-500 (fc’41,5 MPa) in market which price is Rp. 1200.000,00.

THANK YOU