Impact of Mixing And Curing Temperatures on Fresh and Hardened States Properties of UHPC

Abstract of a journal article published in the Canadian Journal of Civil Engineering 2021

Cédric Androuët, Canadian Nuclear Safety Commission
Olivier Deaux, SNC Lavalin
Jean-Philippe Charron, Polytechnique Montréal

Abstract

New Canadian and American standards for concrete and bridges now provide guidelines for the design, production, curing, material characterization and installation of Ultra-High Performance Fiber Reinforced Concretes (UHPFRC, or UHPC) on structures. However, some technical aspects require more research since fundamental knowledge about UHPC is not as complete as for normal strength concretes (NSC). Among these aspects, knowledge of the properties of UHPC produced under field conditions is scarce. The main goal of the research project was to evaluate the fresh state properties (slump flow, air content, mass density, hydration heat) and hardened state properties (elastic modulus, Poisson ratio, compressive and flexural strengths) of a UHPC subjected to various mixing temperatures (10, 20 and 30°C) and curing temperatures (10, 23 and 35°C) encountered in field conditions. The impact of mixing and curing temperatures on each property is discussed and practical information is provided to help engineers plan UHPC curing durations and formwork stripping.

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