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Effects of fly ash and silica fume on disintegration of alkali-activated slag at temperature exposure of 50°C

conference contribution
posted on 2012-01-01, 00:00 authored by Z R Li, Y Liu, Z Pan, W H Duan, Frank CollinsFrank Collins, J Sanjayan
The compressive strength of alkali-activated slag (AAS) paste can be adversely affected by temperature. AAS paste loses its strength when exposed to 50°C for 24 hours. The objective of the current investigation is to evaluate two different mineral admixtures, i.e. fly ash and silica fume, in preventing AAS paste from strength loss. The effect of the above admixtures at various dosages on strength loss was assessed by measuring the retention of compressive strength of samples after exposed to 50°C. Results indicate that the admixtures reduced strength loss. Compared with the fly ash, the silica fume performs better at preventing AAS paste from strength loss. After exposure to 50°C, the use of silica fume to replace 15% of slag reduces the strength loss by 70%. The possible reason for this is discussed based on x-ray diffraction results.

History

Event

ACUN-6 Composites and Nanocomposites in Civil, Offshore and Mining Infrastructure. International Composites Conference (6th : 2012 : Melbourne, Victoria)

Series

ACUN International Composites Conference

Pagination

227 - 232

Publisher

Monash Univesity

Location

Melbourne, Victoria

Place of publication

Clayton, Vic.

Start date

2012-11-14

End date

2016-11-16

ISBN-13

9780646585895

Language

eng

Publication classification

E Conference publication; E1.1 Full written paper - refereed

Copyright notice

2012, ACUN-6 Monash University

Editor/Contributor(s)

Y Bai, S Bandyopadhyay, X-L Zhao, R Singh, S Rizkalla

Title of proceedings

ACUN-6 2012 –Proceedings of the 6th International Composites Conference on Composites and Nanocomposites in Civil, Offshore and Mining Infrastructure

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