In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Chat with Us Online Now
Feedback via Email
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: EFFECT OF NATURAL POZZOLANS ON PORTLAND CEMENT PASTE REOLOLOGY.
Author(s): Viviana F. Rahhal, César Pedrajas, Fabián Irassar y Rafael Talero.
Appears on pages(s): 2-11
Keywords: reology, cement pastes, natural pozzolans.
Abstract:In this paper the influence of three spanish natural pozzolans of different chemical character were analyzed on twoportland cements with very different mineralogical composition (with opposite C3A and C3S content) and with different replacement percentages. All determinations were made at 25°C and just at the dormant periods of their hydration. The results showed that the cement with low C3A and high C3S, had higher shear stress than the cement with high C3A and low C3S; but its recovery was lower. In the pastes with natural pozzolans, the shear stress increased when the proportion of reactive alumina was higher for a particular replacement percentage. At the time the rotor stopped, the shear stress increase was more significant in the case of cement mixtures with high C3A. Finally as the shear stress increased, with higher percentage replacement for the pozzolans A and C; while for the pozzolan O it decreased, possibly due to its low adsorption.
Mexican Institute of cement and concrete, International Partner Access.
View Resource »