Effect of superplasticiser mixing time on pumping characteristics of concrete mixtures Online publication date: Mon, 07-Oct-2024
by Quang-Nhat Pham; Van-Nhan Vu; Phu-Anh-Huy Pham
International Journal of Structural Engineering (IJSTRUCTE), Vol. 14, No. 4, 2024
Abstract: This article discusses experimental results related to the assessment of concrete slump and pump parameters utilising varying proportions of superplasticisers at two distinct time intervals: the initiation of mixing and the end of curing period. The test findings indicate that the pumpability of concrete mixes depends on the specific superplasticiser ratio used during each designated time. Furthermore, the slump of concrete mixes exhibits notable recovery when utilising a specific admixture ratio at the end of the concrete curing process. Additionally, the friction parameters, represented as shear stress (τ) and viscous surface friction (η), exhibit improvement with the gradual incorporation of admixture content at different stages of the concrete's curing period. The optimal proportion of admixture introduced at mixing initiation falls within the range of 20%-40%. Importantly, the addition of additives in various stages during the concrete mixing period, at judicious ratios, does not have adverse effects on concrete strength.
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