Mechanical and durability analysis of fly ash based geopolymer with various compositions for rigid pavement applications
Ordinary Portland cement (OPC) is a conventional material used to construct rigid pave�ment that emits large amounts of carbon dioxide (CO2 ) during its manufacturing process, which is bad for the environment. It is also claimed that OPC is susceptible to acid attack, which increases the maintena...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI
2022
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7234/1/J14295_8c8de227b46e1aef711806205d97c502.pdf http://eprints.uthm.edu.my/7234/ https://doi.org/10.3390/ma15103458 |
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| Summary: | Ordinary Portland cement (OPC) is a conventional material used to construct rigid pave�ment that emits large amounts of carbon dioxide (CO2
) during its manufacturing process, which is
bad for the environment. It is also claimed that OPC is susceptible to acid attack, which increases the
maintenance cost of rigid pavement. Therefore, a fly ash based geopolymer is proposed as a material
for rigid pavement application as it releases lesser amounts of CO2 during the synthesis process and
has higher acid resistance compared to OPC. This current study optimizes the formulation to produce
fly ash based geopolymer with the highest compressive strength. In addition, the durability of fly
ash based geopolymer concrete and OPC concrete in an acidic environment is also determined and
compared. The results show that the optimum value of sodium hydroxide concentration, the ratio of
sodium silicate to sodium hydroxide, and the ratio of solid-to-liquid for fly ash based geopolymer
are 10 M, 2.0, and 2.5, respectively, with a maximum compressive strength of 47 MPa. The results
also highlight that the durability of fly ash based geopolymer is higher than that of OPC concrete,
indicating that fly ash based geopolymer is a better material for rigid pavement applications, with
a percentage of compressive strength loss of 7.38% to 21.94% for OPC concrete. This current study
contributes to the field of knowledge by providing a reference for future development of fly ash
based geopolymer for rigid pavement applications. |
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