SIFAT MEKANIK BETON GEOPOLIMER DENGAN AGREGAT TAILING
| Main Authors: | , Rudi Setiadji Agustiningtyas, ST., , Dr. Ing. Ir. Andreas Triwiyono |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2011
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/90130/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=50995 |
Daftar Isi:
- Geopolymer allows for replacement of the cement in concrete construction applications. Tailing is material such as sand-sized waste from PT Freeport Indonesia in Timika, Mimika District, Papua Province, with a total production of about 80,000 to 100,000 tons per day. The use of fly ash as a binder geopolymer with tailings as fine aggregate in concrete has the potency to increase the utilization of both the waste. The research goal is to find the influence of factors contributing to the mechanical properties, characteristics of short-term geopolymer concrete, and the optimum mixture composition that produces good mechanical properties. Binder of fly ash type F from Suralaya with activators NaOH and Na2SiO3 are used without the use of cement while the filler material is tailing of PT. Freeport Indonesia. Research activities was conducted through three stages, consisting of the manufacture of mortars (5 x 5 x 5) cm 3 geopolymer with NaOH activator, making mortars (5 x 5 x 5) cm 3 geopolymer with a combination of activators NaOH and Na2SiO3, and the manufacture of geopolymer concrete with a combination of activators NaOH and Na2SiO3 forming cylinder diameter 10 cm high 20 cm and beam (10 x 10 x 40) cm 3 . Review of mechanical properties include compressive strength, flexural strength, modululus elasticity, stress-strain relationship test press, density, absorption, and volume of permeable void. The variation of the concentration of NaOH is 8, 10, and 12 M, Na2SiO3/NaOH ratio of 1, 2, and 3, the ratio of activator/fly ash between 0.3 to 0.5. Compaction method with rodding and curing in room temperature without special treatment. The influence of factors contributing to the mechanical properties has been discovered. Increasing tailing reduced the compressive strength. Activator/fly ash 0.4 to 0.5 decreased the compressive strength. NaOH concentration 8M to 12 M reduced slightly the compressive strength. Optimum value of waterglass/NaOH is 2. Si/Al ratio 3.402 to 3.618 negatively influenced the compressive strength and between 3.646 to 3.787 has an optimum value. Characteristics of short-term geopolymer concrete are as follow. Minimum concrete compressive strength at 7 th days was 28.21 MPa in room temperature curing. Slump value was up to 230 mm. Absorption was less than 4.19%. Permeable void volume were 8.79 � 9.39 %. Modulus of elasticity were lower than calculation of normal concrete by SNI 03- 2847-2002. Flexural tensile strength 28th days were greater than 5.90 MPa. The optimum mixture composition that produces good mechanical properties was at fly ash : aggregate 1: 3, the ratio of tailings : split of 43: 57, the ratio of activator/fly ash by 0.4, NaOH concentration of 10 M, the ratio of Na2SiO3/NaOH as 2 produced 28th days compressive strength and flexural tensile strength up to 44.42 MPa and 5.90 MPa.