| Durability and Mechanical Behavior of Fly Ash-GGBFS
Geopolymer Concrete Utilizing Bottom Ash as
Fine Aggregate |
Rachit Ghosh,a,* Sunil Kumar Gupta,b Anil Kumarc and Sanjay Kumara
Pages : 24-33
DOI : 10.1080/0371750X.2019.1581092 |
| Abstract |
| The mechanical properties and durability parameters such as wet-dry cycles, water
sorptivity, efflorescence and acid resistance of geopolymer concrete synthesized
from fly ash of three different origins were evaluated. Scanning electron microscopy
with energy dispersive X-ray spectroscopy and X-ray diffraction tests were
conducted to examine the microstructure and mineralogical changes. It has been
observed that the performance of geopolymer concrete containing fly ash with
more glass content was better. The concrete samples were exposed to atmosphere
for 180 days under a wide range of temperature (11o to 39oC) and relative humidity
(42 to 82%). But the efflorescence was very low and the compressive strength
deterioration was <10% from reference sample kept under controlled condition.
This indicates good durability characteristic of fly ash based geopolymer concrete.
[Keywords: Fly ash, Geopolymer concrete, Residual strength, Weight loss,
Acid resistance] |
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