Effect of Mixing Method On The Rheology And Hardened Properties of Concrete With Low Water/Binder Ratio
|International Journal of Civil Engineering|
|© 2021 by SSRG - IJCE Journal|
|Volume 8 Issue 10|
|Year of Publication : 2021|
|Authors : Isaiah Kiburi Achini, David Otieno Koteng, John Nyiro Mwero|
How to Cite?
Isaiah Kiburi Achini, David Otieno Koteng, John Nyiro Mwero, "Effect of Mixing Method On The Rheology And Hardened Properties of Concrete With Low Water/Binder Ratio," SSRG International Journal of Civil Engineering, vol. 8, no. 10, pp. 1-8, 2021. Crossref, https://doi.org/10.14445/23488352/IJCE-V8I10P101
The amount of water used in concrete mixing is often reduced to a minimum required to hydrate the cementing paste, which increases its strength and durability. Workability is enhanced by addition of a plasticizing admixture. Any loss of moisture during mixing can result in incomplete hydration of the paste and loss of strength. On the other hand, the effectiveness of the mixing method affects the homogeneity of the mix and can also affect its hardened characteristics such as strength. Loss of moisture and homogeneity of the mix reduces the initial workability increasing plasticizer demand. This paper explores the effects of some common mixing methods on the initial workability and strength of concrete of low water/binder ratio. The effects of a paddle (active) mixer and a rotating drum (passive) mixer are also investigated. Results show that material preparation, the sequence of loading, and the type of mixer all have significant effect on initial workability and strength. In general, lower workability and strength was obtained when a rotating drum mixer was used.
Mixer type, loading sequence, workability, strength.
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