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Fresh state properties of conventional range concretes containing blast furnace slag

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Peer-reviewed

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Authors

Lees, Janet 

Abstract

The utilisation of blast furnace slag as a supplementary cementitious material is increasing. Still, there remains uncertainty surrounding its effects on the fresh state performance of concrete mixes, leading to inefficiency and waste in practice. Many studies have attempted to address this uncertainty, but various influencing factors, such as the use of admixtures and the aggregate-binder and water-binder ratios, have not been well controlled. As a result, inconsistent trends and magnitudes of the effect of slag have been reported. This study examines how slag affects fresh state performance without the use of an admixture while maintaining a fixed water-binder and aggregate-binder ratio. Tests were con ducted on various binder contents ranging from 200-550 kg/m3, with slag content varying by 0-70%. The results demonstrate that slag generally has a negative im pact on workability. While minor changes in total slump height (-7%) and static yield stress (+7%) were observed in mixes containing up to 20% slag, significant alterations in total slump height (-40%) and static yield (+69%) were seen for intermediate binder contents at 70% slag inclusion. This study finds that Lyse's rule is less applicable in the presence of slag given the observed variations in the fresh state properties of slag mixes with different binder contents.

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1st International Conference on Net-Zero Built Environment: Innovations in Materials, Structures, and Management Practices

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Engineering and Physical Sciences Research Council (EP/S02302X/1)
Engineering and Physical Sciences Research Council (2275026)