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Abstract Currently, composite mineral admixtures are mostly obtained through blended grinding processes, and the particle sizes of each component cannot be effectively controlled which causes some issues such as over-grinding or under-grinding, leading to high water demand or low reactivity. The separate grinding process can achieve separate control of particle sizes for each component, but it requires large equipment investment, high retrofitting costs and high space requirements, so it has not been widely applied in traditional production enterprises. This study investigates the effects of slag and fly ash particle size on the performance of composite mineral admixtures. Taking advantage of the large number of mills in Songji New Materials Company, multiple ball mills were used in series with segmented feeding techniques to separately control the particle sizes of slag and fly ash, and blended mineral admixtures with different reactivity indices were prepared by this way. When the feeding rate is 37.5 tons per hour, the energy consumption and carbon emissions of this preparation technique are 40.5 kWh per ton and 48. 6 kg per ton respectively. The 7 d reactivity index of the blended mineral admixture reaches 71.1%, indicating optimal comprehensive benefits. When the feeding rate is reduced to 28.8 tons per hour, the 7 d reactivity index of the blended mineral admixture can be increased from 68.4% at 40.0 tons per hour to 74.8%. However, there is a higher energy consumption and carbon emissions associated with this lower feeding rate
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Published: 28 June 2024
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2024, Vol. 0 
