Michael D.A. Thomas

TL;DR: In this article, the authors analyzed data from long-term field and laboratory studies of concrete exposed to chloride environments using a chloride transport model developed at the University of Toronto and found that the incorporation of fly ash and slag may have little impact on transport properties determined at early ages (e.g., 28 days), but can lead to order of magnitude improvements in the long term.

TL;DR: In this article, the authors summarize the current state of understanding and the existing knowledge gaps with respect to reaction mechanisms and the roles of aggregate properties (e.g., composition, mineralogy, size, and surface characteristics), pore solution composition, pH, alkalis, calcium, aluminum, and exposure conditions, such as temperature, humidity) on the rate and magnitude of alkali-silica reaction.

TL;DR: In this article, the effect of supplementary cementing materials (SCM) on alkali-silica reaction (ASR) was studied and it was shown that the efficacy of SCM is dependent on the composition of the SCM.

TL;DR: In this article, the impact of different binding relations on the time-dependent chloride penetration profiles is investigated by solving the chloride mass conservation statement with a finite-difference approach, and the implication of accounting for chloride binding in service life estimations is discussed.

TL;DR: In this article, the results from expansion tests on concrete prisms and mortar bars containing reactive aggregate and different types and levels of fly ash were tested, and the results show that the bulk chemical composition of the fly ash provides a reasonable indication of its performance in physical expansion tests but cannot be used to accurately predict the degree of expansion or the minimum safe level of fly ashes required to suppress expansion to an acceptable limit.