Bonding Strength Characteristics of FA-Based Geopolymer Paste as a Repair Material When Applied on OPC Substrate
This investigative study aims to study the mechanical and morphological properties of fly ash (FA)-based geopolymer paste as a repair material when applied on ordinary Portland cement (OPC) overlay concrete. The first part of this study investigates the optimal mix design of FA-based geopolymer past...
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| Format: | Article |
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MDPI AG
2020-05-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/9/3321 |
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| author | Warid Wazien Ahmad Zailani Aissa Bouaissi Mohd Mustafa Al Bakri Abdullah Rafiza Abd Razak Sorachon Yoriya Mohd Arif Anuar Mohd Salleh Mohd Remy Rozainy M. A. Z. Hamzah Fansuri |
| author_facet | Warid Wazien Ahmad Zailani Aissa Bouaissi Mohd Mustafa Al Bakri Abdullah Rafiza Abd Razak Sorachon Yoriya Mohd Arif Anuar Mohd Salleh Mohd Remy Rozainy M. A. Z. Hamzah Fansuri |
| author_sort | Warid Wazien Ahmad Zailani |
| collection | DOAJ |
| description | This investigative study aims to study the mechanical and morphological properties of fly ash (FA)-based geopolymer paste as a repair material when applied on ordinary Portland cement (OPC) overlay concrete. The first part of this study investigates the optimal mix design of FA-based geopolymer paste with various NaOH concentrations of 8, 10, 12, and 14 M, which were used later as a repair material. The second part studies the bonding strength using a slant shear test between the geopolymer repair material and OPC substrate concrete. The results showed that a shorter setting time corresponds to the higher NaOH molarity, within the range of 53 and 30 min at 8 and 14 M, respectively. The compressive strength of FA-based geopolymer paste was found to reach 92.5 MPa at 60 days. Also, from the slant shear test results, prism specimens with 125 mm length and 50 mm wide have a large bond strength of 11 MPa at 12 M. The scanning electron microscopy/energy-dispersive X-ray (SEM/EDX) analysis showed that the OPC substrate has a significant effect on slant shear bond strength, where the presence of free cations of Ca<sup>2+</sup> on the OPC substrate surface contributed to the formation of calcium alumina-silicate hydrate gel (C-A-S-H) by building various cross-links of Ca-O-Si. |
| first_indexed | 2024-03-10T19:55:07Z |
| format | Article |
| id | doaj.art-0ac92adedf9344f4bbbdfcd78d1224a8 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T19:55:07Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-0ac92adedf9344f4bbbdfcd78d1224a82023-11-19T23:59:41ZengMDPI AGApplied Sciences2076-34172020-05-01109332110.3390/app10093321Bonding Strength Characteristics of FA-Based Geopolymer Paste as a Repair Material When Applied on OPC SubstrateWarid Wazien Ahmad Zailani0Aissa Bouaissi1Mohd Mustafa Al Bakri Abdullah2Rafiza Abd Razak3Sorachon Yoriya4Mohd Arif Anuar Mohd Salleh5Mohd Remy Rozainy M. A. Z.6Hamzah Fansuri7Center of Excellence Geopolymer and Green Technology (CEGeoGTech), School of Materials Engineering, Universiti Malaysia Perlis (UniMAP), Perlis 01000, MalaysiaSchool of Marine Science and Engineering, University of Plymouth, Plymouth PL4 8AA, UKCenter of Excellence Geopolymer and Green Technology (CEGeoGTech), School of Materials Engineering, Universiti Malaysia Perlis (UniMAP), Perlis 01000, MalaysiaCenter of Excellence Geopolymer and Green Technology (CEGeoGTech), School of Materials Engineering, Universiti Malaysia Perlis (UniMAP), Perlis 01000, MalaysiaNational Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, ThailandCenter of Excellence Geopolymer and Green Technology (CEGeoGTech), School of Materials Engineering, Universiti Malaysia Perlis (UniMAP), Perlis 01000, MalaysiaSchool of Civil Engineering, Engineering Campus, Universiti Sains Malaysia (USM), Penang 11800, MalaysiaDepartment of Chemistry, Institut Teknologi Sepuluh Nopember (ITS), Surabaya 60111, IndonesiaThis investigative study aims to study the mechanical and morphological properties of fly ash (FA)-based geopolymer paste as a repair material when applied on ordinary Portland cement (OPC) overlay concrete. The first part of this study investigates the optimal mix design of FA-based geopolymer paste with various NaOH concentrations of 8, 10, 12, and 14 M, which were used later as a repair material. The second part studies the bonding strength using a slant shear test between the geopolymer repair material and OPC substrate concrete. The results showed that a shorter setting time corresponds to the higher NaOH molarity, within the range of 53 and 30 min at 8 and 14 M, respectively. The compressive strength of FA-based geopolymer paste was found to reach 92.5 MPa at 60 days. Also, from the slant shear test results, prism specimens with 125 mm length and 50 mm wide have a large bond strength of 11 MPa at 12 M. The scanning electron microscopy/energy-dispersive X-ray (SEM/EDX) analysis showed that the OPC substrate has a significant effect on slant shear bond strength, where the presence of free cations of Ca<sup>2+</sup> on the OPC substrate surface contributed to the formation of calcium alumina-silicate hydrate gel (C-A-S-H) by building various cross-links of Ca-O-Si.https://www.mdpi.com/2076-3417/10/9/3321fly ashgeopolymer repair materialcompressive strengthbonding strengthbonding zone |
| spellingShingle | Warid Wazien Ahmad Zailani Aissa Bouaissi Mohd Mustafa Al Bakri Abdullah Rafiza Abd Razak Sorachon Yoriya Mohd Arif Anuar Mohd Salleh Mohd Remy Rozainy M. A. Z. Hamzah Fansuri Bonding Strength Characteristics of FA-Based Geopolymer Paste as a Repair Material When Applied on OPC Substrate Applied Sciences fly ash geopolymer repair material compressive strength bonding strength bonding zone |
| title | Bonding Strength Characteristics of FA-Based Geopolymer Paste as a Repair Material When Applied on OPC Substrate |
| title_full | Bonding Strength Characteristics of FA-Based Geopolymer Paste as a Repair Material When Applied on OPC Substrate |
| title_fullStr | Bonding Strength Characteristics of FA-Based Geopolymer Paste as a Repair Material When Applied on OPC Substrate |
| title_full_unstemmed | Bonding Strength Characteristics of FA-Based Geopolymer Paste as a Repair Material When Applied on OPC Substrate |
| title_short | Bonding Strength Characteristics of FA-Based Geopolymer Paste as a Repair Material When Applied on OPC Substrate |
| title_sort | bonding strength characteristics of fa based geopolymer paste as a repair material when applied on opc substrate |
| topic | fly ash geopolymer repair material compressive strength bonding strength bonding zone |
| url | https://www.mdpi.com/2076-3417/10/9/3321 |
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