CONCRETE ADMIXTURES – INTERACTIONS WITH CEMENT, SUPPLEMENTARY CEMENTING MATERIALS AND FILLERS

Author(s): Harald Justnes and Serina Ng
Paper category: Proceeding
Book title: Design, Performance and Use of Self-Consolidating Concrete
Editor(s): Caijun Shi, Zhihua Ou and Kamal Henri Khayat
Print-ISBN: 978-2-35158-143-8
e-ISBN: 978-2-35158-144-5
Publisher: RILEM Publications SARL
Publication year: 2014
Pages: 138
Total Pages : 1
Language : English

Abstract: The trend in modern concrete technology is to make blended cement where the clinker is partly substituted with supplementary cementing materials (SCMs) or to replace some of the cement in concrete with SCMs. Concrete also contains deliberately added mineral fillers or simply mineral fines from the aggregate. Plasticizers are usually designed with the cement in mind, but they will interact with all surfaces of the concrete constituents both physically and chemically.
These interactions are discussed for the three categories of plasticizers; lignosulphonate (LS), naphthalene sulphonate-formaldehyde condensate (NSF) and polycarboxylic ethers (PCEs). SCMs like silica fume, fly ash and calcined clays are focused upon and a variety of mineral fillers including calcite being of such importance for self-consolidating concrete (SCC).
It is shown that fly ash interacts much less with plasticizers than calcined clay, and that among the fillers calcite lead to better flow than predicted from the linear relation between flow and specific surface of the other mineral fillers.

Online publication: 2017
Publication type: full_text
Public price (Euros): 0.00