Static yield stress measurements of fine aggregates

Research output: Contribution to journalConference articleContributedpeer-review

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Abstract

Fine grained concrete with a maximum grain size of D = 2 mm can be designed as high-performance concrete with outstanding properties. Typical applications are 3D-printing, grouts, textile-reinforced concrete and thin high-performance structures. Studies reported in the literature that with decreasing grain size the impact of the granulometric properties of the aggregates is increasing. These properties are not only influencing the water demand but also the rheological behavior, such as the static yield stress. In order to investigate and quantify the effects of granulometry on static yield stress measurements six different sands of three deposits within the range of d/D = 0/2 mm and industrial made glass spheres were tested. The granulometric properties of the materials have been investigated using digital image analyzing. The measurement device was a rotational viscosimeter (Viskomat NT) equipped with a Vane-paddle. Factors as the sample preparation (compaction) and applied shear rate under a constant shear rate protocol (CSR) were analyzed. An optimum measurement procedure for the grain mixtures was found in using 0.2 rpm and a layer-wise static compaction. The analysis showed the importance of the grain size distribution of comparable grain mixtures regarding the static yield torque.

Details

Original languageEnglish
Pages (from-to)MAT-31-1-MAT-31-6
Number of pages6
JournalProceedings of International Structural Engineering and Construction
Volume9
Issue number1
Publication statusPublished - 2022
Peer-reviewedYes

Conference

Title4th European and Mediterranean Structural Engineering and Construction Conference
SubtitleState-of-the-art Materials and Techniques in Structural Engineering and Construction
Abbreviated titleEURO MED SEC 4
Conference number4
Duration20 - 25 June 2022
Degree of recognitionInternational event
LocationHochschule für Technik, Wirtschaft und Kultur Leipzig & online
CityLeipzig
CountryGermany

Keywords

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Keywords

  • Digital image analyzing, Fine-grained concrete, Granulometry, High performance concrete, Particle shape, Rheology, Static yield torque

Library keywords