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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
