doi:10.3850/978-981-08-7920-4_S3-M027-cd

ABSTRACT

This paper reports an investigation into compressive strength development of high volume ultra fine fly ash mortar produced using different types of mixing water. The fineness of ultra fine fly ash was achieved by grinding raw fly ash with a micronizer, a jet mill, using compressed air or gas. Two different mixing water types were used, tap water and saturated lime water. The compressive strength development of normal cement mortar and high volume fly ash mortar were also investigated as control tests. The mortars were tested for their compressive strength at the ages of 7 days, 14 days, 21 days, 28 days, and 56 days. Setting time of binder and absorption of mortar were also tested. The results showed that the high volume fly ash as binder can act as a water reducer in mortar and this reduction, therefore; leads to the increase of mortar solidity. In comparison to normal cement mortar, the use of high volume fly ash in mortar makes its strength development slow and decreases its final strength. On the other hand, the use of saturated lime water in high volume ultra fine fly ash mortar gives the same compressive strength and strength development as those in normal cement mortar.

Keywords: Mortar, High volume ultra fine fly ash, Lime water, Compressive strength.

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