Author
J.F. Dorion
Bio: J.F. Dorion is an academic researcher from Laval University. The author has contributed to research in topics: Alkali–silica reaction & Alkali–aggregate reaction. The author has an hindex of 3, co-authored 3 publications receiving 133 citations.
Papers
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TL;DR: In this article, particles from 17 different aggregates, 1.25-5 mm in size, were immersed in continuously agitated solutions at 38 °C: distilled water, Ca(OH)2-saturated solution, 0.7 M NaOH (measurement of K supply), and 0.5 M KOH (metric measurement of Na supply).
119 citations
TL;DR: In this paper, high and low-alkali cements were used to make concrete cylinders, 255 mm in diameter, with a highly alkali-silica-reactive coarse aggregate, and subjected to various conditions at 38 � C: immersion in 3% NaCl solution; immersion in 6% NaC solution; humidity at 100% RH; and 14-day cycles including 12 days in humid air, 2 days of drying, and 3 h in 6%.
31 citations
TL;DR: Berube et al. as mentioned in this paper used immersion tests in NAOH and KOH solutions and considered the role of solution-to-aggregate ratio in determining available alkalis from aggregates.
8 citations
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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.
355 citations
TL;DR: In this paper, the authors discuss which parameters must be considered to be able to develop reliable ASR performance testing methods and provide some tentative recommendations, including the internal humidity in the test specimens, the extent of alkali leaching and the storage temperature.
240 citations
TL;DR: The damaging impact of various deicing chemicals and exposure conditions on concrete materials was investigated in this paper, where five deicing agents (sodium chloride, calcium chloride with and without a corrosion inhibitor, potassium acetate, and an agricultural product) were studied.
Abstract: The damaging impact of various deicing chemicals and exposure conditions on concrete materials was investigated. Five deicing chemicals (sodium chloride, calcium chloride with and without a corrosion inhibitor, potassium acetate, and an agricultural product) were studied. Freezing–thawing (F–T) and wetting–drying (W–D) exposure conditions were considered. Mass loss, scaling, compressive strength, chemical penetration, and micro-structure of the paste and concrete subjected to these deicing chemicals and exposure conditions were evaluated. Results indicated that the various deicing chemicals penetrated at different rates into a given paste and concrete, resulting in different degrees of damage. Among the deicing chemicals tested, two calcium chloride solutions caused the most damage. Addition of a corrosion inhibitor into the calcium chloride solution delayed the onset of damage, but it did not reduce the ultimate damage. Chloride-related deicing chemicals often brought about leaching of calcium hydroxide, as well as chemical alterations in concrete. Potassium acetate caused minor scaling, associated with alkali carbonation of the surface layer of concrete. Although producing a considerable number of micro-pores on the surface of the samples, the agricultural deicing product resulted in the least chemical penetration and scaling damage of paste and concrete.
235 citations
TL;DR: In this paper, the authors presented the mechanical, durability, and microstructural characterization of unstressed glass-fiber-reinforced-polymer (GFRP) reinforcing bars exposed to concrete environment and saline solutions under accelerating conditions.
207 citations
TL;DR: A literature review of methods for determining the pH and/or the free alkali metal content in the pore solution of concrete is presented in this paper, where three ex situ leaching methods (ESL) applied to Portland CEM I and CEM II mortars are compared.
146 citations