Rheological and Strength Characteristics of Cement Mortar using Mineral Admixtures

Author(s): Dr.G.Ramakrishna and S.Priyadharshini
Paper category: Proceeding
Book title: International Conference on Advances in Civil Engineering and Sustainable Construction
Editor(s): T.Ch. Madhavi, G. Prabhakar, Santhosh Ram, and P.M. Rameshwaran
Print-ISBN: None
e-ISBN: 978-2-35158-161-2
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 1-6
Total Pages : 6
Language : English

Abstract: Cement paste or mortar matrix is made up of small grained particles of sizes ranging from microns to millimeters. It is popular in current researches of using mineral admixtures as partial replacements for ordinary Portland cement. This addition of mineral admixtures may affect the rheological and flow behavior of the fresh mixes. Therefore it is mandatory to study the rheological behavior of such mixes rather than conducting flow test alone. In this present investigation, the rheological behavior of cement paste and 1:3 mortar with and without mineral admixtures namely fly ash and GGBFS at various water-binder ratios of 0.3 to 0.9 are studied. The fly ash and GGBFS are replaced from 10 to 40% and 10% to 70% as binary and ternary blends. The rheological behavior and flow test are performed using vane shear test and flow tests. Also the strength characteristics such as flexure strength and split tensile strength are performed for mortar mixes at 28 and 56 days of water curing. The results show that the rheological behavior of paste and mortar are similar for fly ash and GGBFS mix, showing increase of cohesion as replacement level increases. On the other hand, the ternary mix enhances the rheological characteristics of mixes by reducing cohesion/shear resistance with increase of replacement levels of admixtures. The rheological behavior of mortar matches with the flow values and this proves that the vane shear test can be a viable option for understanding the fresh behavior of fly ash and GGBFS based cement paste and mortars. The strength characteristics of mortar specimen increase with curing days and W/B ratios and the strengths are better in case of binary blends than that of ternary blends.

Online publication: 2017
Publication type: full_text
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