Influence of the mineral composition of cement binder on the ACR reaction in con- crete

Author(s): Petra Štukovnik, Violeta Bokan Bosiljkov, Marjan Marinšek
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials Systems and Structures (SMSS2019) Durability, Monitoring and Repair of Structures
Editor(s): Ana Baričević, Marija Jelčić Rukavina, Domagoj Damjanović, Maurizio Guadagnini
ISBN: 978-2-35158-217-6
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 176-183
Total Pages: 813
Language: English

Abstract: The paper presents a study about differences and similarities in alkali-carbonate reaction (ACR) process inside concrete prepared with the same carbonate aggregate and different cement binders. Used aggregate is typical Slovenian late digenetic dolomite. The first cement binder is pure Portland cement (CEM I) and the second one is Blastfurnace cement (CEM III). The study of the ACR progress was carried out under accelerated conditions simulated by the 1 M aqueous NaOH solution at 60°C, up to 1 year. Analyses on the micro level were carried out using a petrographic microscope and scanning electron microscopy with X-ray microanalysis (SEM/EDS). On the macro level, measurements of specimens’ length and mass changes as well as compressive and flexural tests were carried out parallel to the microscopic investigations. The first results of the study show that the ACR process is slower in concrete with Blastfurnace cement. However, for both compositions the same products that are results of the ACR are formed. We can conclude that the replacement of the CEM I cement with the CEM III cement does not hinder the initialisation and progress of the ACR. It only shifts the formation of the reaction products to a later time.

Online publication :2019
Publication type : full_text
Public price (Euros) : 00