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Rheological behaviour of fresh cement pastes: Influence of synthetic zeolites, limestone and silica fume
Abstract New generation concretes have specific properties, often obtained by using additives, and these properties are strongly affected by rheological characteristics of the fresh cement paste. In this work small amplitude oscillations were adopted to investigate the effects of synthetic zeolite, limestone and silica fume on the rheological properties of fresh pastes. Time sweep tests were used to describe paste evolution with time evidencing that zeolite is more able to increase the rate of structure development with respect to other additives. Frequency sweep tests evidenced that zeolite, at least at low concentration, is able to improve the mechanical strength and to increase the liquid-like behaviour of the paste. Adopted rheological tests and data analysis are suitable to describe paste structure and evolution with time and synthetic zeolite seems able to give better properties to cement paste than other additives can.
Highlights Rheological behaviour of fresh neat and modified cement pastes was studied. The effects of limestone, silica fume and zeolite were investigated. Early hydration of cement pastes was characterised with dynamic time sweep tests. The rheological Structure Development Rate (SDR) was determined by using dynamic data. Results evidenced zeolite ability to increase SDR and strength in cement paste.
Rheological behaviour of fresh cement pastes: Influence of synthetic zeolites, limestone and silica fume
Abstract New generation concretes have specific properties, often obtained by using additives, and these properties are strongly affected by rheological characteristics of the fresh cement paste. In this work small amplitude oscillations were adopted to investigate the effects of synthetic zeolite, limestone and silica fume on the rheological properties of fresh pastes. Time sweep tests were used to describe paste evolution with time evidencing that zeolite is more able to increase the rate of structure development with respect to other additives. Frequency sweep tests evidenced that zeolite, at least at low concentration, is able to improve the mechanical strength and to increase the liquid-like behaviour of the paste. Adopted rheological tests and data analysis are suitable to describe paste structure and evolution with time and synthetic zeolite seems able to give better properties to cement paste than other additives can.
Highlights Rheological behaviour of fresh neat and modified cement pastes was studied. The effects of limestone, silica fume and zeolite were investigated. Early hydration of cement pastes was characterised with dynamic time sweep tests. The rheological Structure Development Rate (SDR) was determined by using dynamic data. Results evidenced zeolite ability to increase SDR and strength in cement paste.
Rheological behaviour of fresh cement pastes: Influence of synthetic zeolites, limestone and silica fume
Baldino, Noemi (author) / Gabriele, Domenico (author) / Lupi, Francesca R. (author) / Seta, Lucia (author) / Zinno, Raffaele (author)
Cement and Concrete Research ; 63 ; 38-45
2014-04-23
8 pages
Article (Journal)
Electronic Resource
English
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