Abstract
A cement powder, composed of belite, alite and ye’elimite, was blended with 0, 15 and 30 wt% of fly ash and the resulting blended cements were further characterized. During hydration, the presence of fly ash caused the partial inhibition of both AFt degradation and belite reactivity, even after 180 days. The compressive strength of the corresponding mortars increased by increasing the fly ash content (68, 73 and 82 MPa for mortars with 0, 15 and 30 wt% of fly ash, respectively, at 180 curing days), mainly due to the diminishing porosity and pore size values. Although pozzolanic reaction has not been directly proved there are indirect evidences.
Highlights
Introduction first pageLine 37: Change coal-firing to coal-fired; Change from power station perspective to From the power station's perspective
From the 4175 building industry's perspective, Fly ash (FA) is looked upon as a supplementary cementitious material (SCM) which is used in mass as a cement replacement material [3]
The addition of FA to cement can modify its properties, such as reduced hydration heat and thermal cracking in concrete at early ages, durability, enhanced ultimate strength, and improved workability of fresh mortar/concrete when cement is replaced by FA [3, 4]
Summary
Introduction first pageLine 37: Change coal-firing to coal-fired; Change from power station perspective to From the power station's perspective. Line 42: Change building industry perspective to building industry's perspective. Line 7: Cements is plural, use have, not has. Line 37: PC not OPC, add a in front of pozzolanic and filler Answer: Done. Line 39: Change to focused on the effects of FA on. An environmental strategy to reduce the negative effect of the CO2 footprint of the Portland Cement (PC). Industry consists on its partial substitution by reactive industrial by-products, such as fly ash [1, 2]. Fly ash (FA) is the major solid waste generated from coal-fired power stations. From the power station's perspective, there are methods to exploit fly ash disposal in an economically advantageous way. Despite the benefits offered by PC cement/concrete blended with FA, there are some limitations related to the variability of the mineralogy and chemical composition of the FA [5], and the maximum amount of FA that can be added
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