English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

no-slump concrete (nsLc) and self-compacting concrete (scc) are two types of concretes, which became increasingly adapted by the concrete industry because of their specific rheological characteristics. For nsLc mixtures the high shape holding ability allows formworks to be removed shortly after concrete placing. However, nsLc needs a large amount of energy to be properly compacted. For scc mixtures it is the high flowability and self-compactability that makes them unique. However, as scc is not able to preserve its shape right after placing, formwork cannot be removed directly after casting. By comparing these two extreme cases, an ideal mixture would have been obtained, i.e. a self-compacting no-slump concrete (scnsLc), which can compact under its own weight and maintains its shape right after casting. in this paper the possibility of a self-compacting no-slump concrete (scnsLc) is discussed. the rheological behaviour of these mixtures in the dormant period is in focus, when the degree of hydration is still very limited. the shape holding ability of both mixtures is characterized by a shape preservation factor 0<sPF≤1. sPF shows the ability of a mixture to preserve its shape after lifting the cone during a slump test. sPF is the ratio of the vertical cross sectional area of a sample after and before lifting the cone. By increasing flowability of a mixture, the sPF decreases. results show how to design such mixtures having optimized rheological properties between those of nsLc and scc. keywords: rheological behaviour, self-compacting no-slump concrete, two-phase aggregate-paste model, shape preservation factor kulcsszavak: reológiai viselkedés, roskadásmentes öntömörödő beton, kétfázisú adalékanyagpép modell, alaktényező hooman hOORNAhAD received his PhD from Faculty of civil engineering and Geosciences, Delft university of technology. His field of interest is rheology of paste, mortar, concrete and granular material. He is riLem member and (co-)author of about 20 conference and journal papers. He was a lecturer and research associate in American concrete institute (Aci), iran chapter. Eduardus A. B. kOENDERS is Full Professor and Head of the institute for construction and Building materials, Faculty of civil and environmental engineering, technical university of Darmstadt. His research interests include multi-scale modeling of hydration and moisture transport, sustainable and durable materials, recycled aggregates and energy saving material concepts for construction. He is riLem member and chairman of the riLem eAc mmc course on multi-scale modeling of concrete. klaas van BREUGEL is Full Professor and Head of the section materials and environment, Faculty of civil engineering and Geosciences, Delft university of technology. His fields of expertise concerns design of concrete containment structures, extreme load conditions, early age concrete and modelling and simulation for materials and structures. He is member of several international organisations Aci, riLem, iABse and fib. He has chaired several national and international research committees. in 2013 the Ageing centre for materials, structures and systems was launched under his supervision.

Towards the development of self-compacting no-slump concrete mixtures