Elbasir, Othman Mosbah Mohamed (2018) Characterization And Evaluation Of Alkaline Activated Mortars Synthesized From Binary And Ternary Blends Of Palm Oil Fuel Ash, Ground Granulated Blast Furnace Slag And Fly Ash. PhD thesis, Universiti Sains Malaysia.
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Abstract
Abu bahanapi kelapa sawit (POFA) dengan kehalusan yang berbeza (t-POFA, f-POFA dan u-POFA) memberi kesan kekuatan mampatan dan mikrostruktur mortar yang berasaskan POFA alkali teraktif. Campuran mortar ultrahalus POFA (u-POFA) alkali teraktif menunjukkan kekuatan mampatan yang tertinggi yang diukur antara 7 dan 28 hari. Pelbagai teknik penganalisaan (XRD, FTIR, dan FESEM-EDX) yang dilakukan pada sampel menunjukkan wujudnya pembentukan C-S-H dan N-A-S-H. Perbandingan telah dibuat secara individu untuk POFA, FA dan GGBFS sebagai mortar alkali teraktif menggunakan kaedah Taguchi. Keputusan kajian menunjukkan bahawa kekuatan mampatan tertinggi pada 28 hari rawatan secara individu POFA, FA dan GGBFS sebagai mortar alkali teraktif adalah masing-masing 41.20 MPa, 51.14 MPa dan 93.97 MPa. Kekuatan mampatan yang tinggi ini boleh dikaitkan dengan pembentukan pengikat gel (C-S-H dan N-A-S-H) dalam mortar alkali teraktif, seperti yang dibuktikan oleh analisis XRD, FTIR dan FESM-EDX. Mortar alkali teraktif binari dan ternari daripada tiga bahan (POFA, FA dan GGBFS) menunjukkan peningkatan kekuatan mampatan yang ketara apabila ditambah kepada kira-kira 25% berat u-POFA untuk campuran binari. Walau bagaimanapun, dalam ternari, kekuatan tertinggi diperolehi daripada 40% berat u-POFA, 20% berat FA dan 40% berat GGBFS. Kajian ini mengesahkan bahawa mortar alkali teraktif yang telah dibangunkan dalam kajian ini mempunyai prestasi yang amat baik apabila terdedah kepada pelbagai persekitaran yang agresif dan menunjukkan kestabilan terma yang tinggi apabila terdedah kepada suhu tinggi sehingga 1000 °C. _______________________________________________________________________________________________________ Palm oil fuel ash (POFA) with different fineness (t-POFA, f-POFA and u- POFA) has affected the compressive strength and the microstructure of the POFAbased alkaline activated mortars. The ultrafine POFA (u-POFA) alkaline activated mortar mixture exhibits the highest compressive strength measured between 7 and 28 days of age. Various analyses techniques (XRD, FTIR, and FESEM-EDX) were performed on the samples which showed the formation of C–S–H and N–A–S–H. Comparison has been made for individual POFA, FA and GGBFS as alkali activated mortars using Taguchi method. The results showed that the highest compressive strength at 28 days of curing individual POFA, FA and GGBFS as alkali activated mortars are 41.20 MPa, 51.14 MPa, and 93.97 MPa, respectively. This high compressive strength can be attributed to the formation of gel binder (C–S–H and N– A–S–H) in the alkali activated mortars, as proven by XRD, FTIR and FESM-EDX analyses. The binary and ternary blended alkaline activated mortars of three materials (POFA, FA and GGBFS) showed significant compressive strength improvement when added to about 25 wt% u-POFA for the binary blend. However, in ternary the highest strength obtained from 40 wt% u-POFA, 20 wt% FA and 40 wt% GGBFS. This research confirmed that the alkali activated mortar developed in this study has superior performance when exposed to various aggressive environments and exhibited high thermal stability when exposed to elevated temperature up to 1000 °C.
| Item Type: | Thesis (PhD) |
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| Additional Information: | Full text is available at http://irplus.eng.usm.my:8080/ir_plus/institutionalPublicationPublicView.action?institutionalItemId=4734 |
| Subjects: | T Technology T Technology > TA Engineering (General). Civil engineering (General) > TA1-2040 Engineering (General). Civil engineering (General) |
| Divisions: | Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Kimia (School of Chemical Engineering) > Thesis |
| Depositing User: | Mr Mohd Jasnizam Mohd Salleh |
| Date Deposited: | 19 Jun 2019 09:54 |
| Last Modified: | 19 Jun 2019 09:54 |
| URI: | http://eprints.usm.my/id/eprint/44681 |
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