An ambt study on the effect of limestone on ASR mitigation: ground limestone vs. interground limestone in cements

Author(s): Marie Joshua Tapas, Kirk Vessalas, Paul Thomas, Vute Sirivivatnanon
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: 201-207
Total Pages: 813
Language: English

Abstract: This study reports on the effect of cement limestone addition on alkali-silica reaction (ASR) induced expansion for binder systems with and without supplementary cementitious materials (SCMs) using accelerated mortar bar test. Two (2) approaches were carried out to obtain the desired amount of limestone in the binder: one by adding ground limestone to 0% Limestone General Portland cement (LC) and another by combining 17% LC (interground limestone source) with 0% LC to get desired limestone content. The combined effect of limestone and SCMs was also evaluated by replacing part of the cement with nominated percentages of fly ash and ground granulated blast furnace slag. AMBT expansion results show that regardless of limestone source (ground or interground), limestone does not influence the efficacy of SCMs in ASR mitigation. Further, it shows that there is no difference in expansion regardless of limestone content in specimens with and without SCMs suggesting that limestone has no mitigating effects. Thermogravimetric analysis (TG) results however show that portlandite content decreases with respect to increasing limestone content consistent with cement dilution. As there was no observable difference in expansion corresponding to limestone content, this suggests that the effect of cement dilution maybe beyond the capacity of AMBT. Additional work however needs to be done to verify the hypothesis.

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