AI SearchDevelopment of durable concrete from pulverized fly ash and pozzolan derived from agricultural wastes
Call Number: AIT Thesis no.ST-03-06 Material type:
SeriesSeries: Asian Institute of Technology. Thesis ; no. ST-03-06Publication details: Bangkok : Asian Institute of Technology, 2003Description: 62 leavesSubject(s): Online resources: Dissertation note: Thesis (M.Eng.) - Asian Institute of Technology, 2003 Summary: This research study evaluates the properties of concrete using fly ash and rice husk ash as high volume replacement of cement. Mix proportions were developed for cement replacement of 50% and 70% with fly ash, rice husk ash and the combination of these two. Control mix with no fly ash and rice husk ash was also prepared and tested. The dosage of superplastisizer was maintained at 2% by weight of cement for all cases. For each concrete mix specimens were made to evaluate their compressive strength at different ages up to 91 days, water permeability and resistance against acid attack. These properties were then compared with those of the control mix. Test results showed that the mixes associated with fly ash, rice husk ash and the combination of these two, performed better than the control mix against acid attack. As the weight loss for the mix associated with the pozzolan was less than the control mix. It was observed that the aggressiveness of sulfuric acid on concrete was more severe than hydrochloric acid. As the weight loss for the former was more than the latter. Permeability coefficient of mix containing 50% fly ash was lower than the control mix at every age of testing. The coefficient of permeability increased as the amount of rice husk ash was increased. Furthermore the coefficient of permeability was lower for 50% cement replacement than for 30% cement replacement with fly ash and rice husk ash. The mixes associated with fly ash, rice husk ash and the combination of these two, showed compressive strength lower than that of the control mix. However apart from mixes containing high amount of rice husk ash all other mixes showed compressive strength of more than 25 MPa at 28 days. From the test results obtained it can be concluded that high volume replacement of cement by fly ash and rice husk ash is feasible. However the mix that contained high dosage of rice husk ash showed low compressive strength at early age and there was not substantial rise in the strength at later ages. But this problem can be effectively overcome by blending rice husk ash with fly ash.
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A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Civil Engineering
Thesis (M.Eng.) - Asian Institute of Technology, 2003
This research study evaluates the properties of concrete using fly ash and rice husk ash as high volume replacement of cement. Mix proportions were developed for cement replacement of 50% and 70% with fly ash, rice husk ash and the combination of these two. Control mix with no fly ash and rice husk ash was also prepared and tested. The dosage of superplastisizer was maintained at 2% by weight of cement for all cases. For each concrete mix specimens were made to evaluate their compressive strength at different ages up to 91 days, water permeability and resistance against acid attack. These properties were then compared with those of the control mix. Test results showed that the mixes associated with fly ash, rice husk ash and the combination of these two, performed better than the control mix against acid attack. As the weight loss for the mix associated with the pozzolan was less than the control mix. It was observed that the aggressiveness of sulfuric acid on concrete was more severe than hydrochloric acid. As the weight loss for the former was more than the latter. Permeability coefficient of mix containing 50% fly ash was lower than the control mix at every age of testing. The coefficient of permeability increased as the amount of rice husk ash was increased. Furthermore the coefficient of permeability was lower for 50% cement replacement than for 30% cement replacement with fly ash and rice husk ash. The mixes associated with fly ash, rice husk ash and the combination of these two, showed compressive strength lower than that of the control mix. However apart from mixes containing high amount of rice husk ash all other mixes showed compressive strength of more than 25 MPa at 28 days. From the test results obtained it can be concluded that high volume replacement of cement by fly ash and rice husk ash is feasible. However the mix that contained high dosage of rice husk ash showed low compressive strength at early age and there was not substantial rise in the strength at later ages. But this problem can be effectively overcome by blending rice husk ash with fly ash.
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