NEW INSIGHT INTO THE EQUIVALENT CONCRETE MORTAR APPROACH FOR SELF CONSOLIDATING CONCRETE

Author(s): Ammar Yahia, Paco Diederich and Daddy K. Kabagire
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: 72
Total Pages : 1
Language : English

Abstract: Concrete Equivalent Mortar (CEM) approach consists in replacing the mass of coarse aggregate by an equivalent mass of sand to provide an equivalent specific surface area. The approach is useful for determining optimum admixtures dosages to ensure proper workability characteristics Such approach can reduce time, effort, and cost needed to develop and control complex flowable materials, such as self-consolidating concrete (SCC). It is also extended with less success to evaluate rheological properties of SCC using those of the corresponding CEM. The limitation of the approach is mainly due to the fact that the surface area of aggregate is the only criterion used to design CEM. The objective of this investigation is to evaluate the applicability of the original CEM approach to optimize SCC and establish correlations between rheological properties of SCC and CEM. Various SCC mixtures were proportioned with different coarse aggregate content ranging from 27 to 36% and binder content between 300 and 500 kg/m3. Test results showed that at concrete scale, flow properties are dominated by the internal friction between coarse aggregate, whereas at CEM scale properties are dominated by the excess paste thickness and paste rheology. Good correlations between CEM flow properties and those of SCC are obtained when the excess paste thickness and coarse aggregate content are taken into account. The established correlations are useful to predict flow properties of SCC from those of corresponding CEM mixtures.

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