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Effect of Ggbfs and Micro-silica on Mechanical Properties, Shrinkage and Microstructure of Alkali-activated Fly Ash Mortar
| Content Provider | Semantic Scholar |
|---|---|
| Author | Tajunnisa, Yuyun |
| Copyright Year | 2017 |
| Abstract | Performance of drying shrinkage, flow rate, mechanical properties, and microstructure of three materials alkali-activated fly ash (FA); ground granulated blast-furnaced slag (GGBFS); and un-densified micro-silica (M) are investigated. Mixtures used herein are referred to as AAM – alkali activated materials – of four types according to composition: AAM-IV, AAM-V, AAM-VI and AAM-VII (note: types 1 through 3 were investigated in previous research) with corresponding mixture FA, GGBFS and M ratios of 47.5/47.5/5, 45/45/10, 42.5/42.5/15, 40/40/20 by weight percentage. The AAM samples were air-cured under a sealed condition for 6 days followed by unsealed curing up to the test at 18-20° C and a low relative humidity of 3050%. The samples AAM-IV through VII were composed of a progressive decrease of fly ash and GGBFS and an increase in M content. Results show that flow rate and compressive strength increased from AAM-IV to AAM-VI; contrarily, it decreased in AAM-VII. Both flexural strength – a positive aspect and drying shrinkage – negative as it leads to cracking increased in all samples. Incorporation of both GGBFS and M in alkaliactivated fly ash mortar was found to improve performance compared to that incorporated solely of GGBFS in alkali-activated fly ash. The incorporation of M of certain values improves strength and flowability of AAM; conversely, it results in a higher drying shrinkage value, which leads to increased cracking. SEM and XRD results confirm these results. Unreacted particles of AAM-VI and AAM-VII appear to act as a ‘microaggregate,’ resulting in increased compressive and flexural strength. |
| File Format | PDF HTM / HTML |
| DOI | 10.21660/2017.39.11341 |
| Alternate Webpage(s) | http://www.geomatejournal.com/sites/default/files/articles/87-94-11341-Yuyun-Nov-2017.pdf |
| Alternate Webpage(s) | https://doi.org/10.21660/2017.39.11341 |
| Volume Number | 13 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
