Improvement of properties of high volume fly ash based self-compacting mortar with dolomite and ground granulated blast furnace slag
Abstract
Usage of filler with inert or pozzolanic property has been crucially required for fabricating the practical
self-compacting mortar or self-compacting concrete. The current study investigates the influence of using
the dolomite powder on the enhanced properties of the high volume Class F fly ash self-compacting mortar
with/without addition of ground granulated blast furnace slag (GGBFS/slag). Experimental results showed that
partial replacement of low calcium Class F fly ash with the dolomite powder not only increased the workability of the fresh modified self-compacting mortars but also enhanced the ordinary Portland cement hydration
process at early. The adjustment of dolomite powder addition as partial replacement of fly ash resulted in the
modified self-compacting mortars with the compressive strength increased after 7 days of curing. 30 mass
percent of dolomite powder partially replacing fly ash was considered as the optimum value to induce the hardened modified self-compacting mortars with the compressive strengths increased at 4.2, 10.4, and 10.5% at
3, 7, and 28 days, respectively. With the content of dolomite powder being fixed at 30 and 50 mass percent,
partial replacement of fly ash with slag at 50 mass percent induced the modified self-compacting mortars with
significant enhancement of the engineering properties.
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