Durability of UHPC Under Complex Environments

Author(s): An M.Z., Wang V., Yu. Z.R., Ji W.Y., Han S
Paper category: Proceedings
Book title: 1st International Conference on UHPC Materials and Structures
Editor(s): Caijun Shi and Dehui Wang
ISBN: 978-2-35158-164-3
e-ISBN: 978-2-35158-165-O
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 380-394
Total Pages: 15
Language: English

Abstract: The structure working under marine and saline-alkali environment in severe cold regions is extremely easy to be destroyed by the coupling effect of various environmental factors. With the features such as high durability, super strength, high toughness and high temperature adaptability, ultra-high performance concrete (UHPC) is suitable for being used as the main structure material and protective material under complex environments. Through the coupling
experiments of chlorine salt erosion and freeze-thaw cycle, sea water freeze-thaw cycle, and sulfate drying-wetting alternation and freeze-thaw cycle, this paper studies the change rules of the physical and mechanical properties of UHPC, proposes the rules of how mix proportion parameters influence the durability of UHPC, and combines microscopic experiments with
theoretical analysis to elaborate on the failure mechanism. The experimental results show that the mass loss rate of UHPC should not be used as the evaluation index of the durability of UHPC, and the relative dynamic elasticity modulus should not be used as the single evaluation index of the durability of UHPC under the chlorine salt freeze-thaw environment. After 1500 chlorine salt freeze-thaw cycling, the compressive strength decreased by 41.6%; after 800 times of sea water freeze-thaw cycling, the compressive strength decreased by 20.4%. The mixture of fly ash improved the resistance of UHPC towards the coupling effect of sulfate dry-wet cycling and freeze-thaw cycling, but it did not mean more mixture of fly ash was better. UHPC has an excellent durability under complex environments, and the research results can provide
theoretical basis for the structural design and protection design which using UHPC under complex working environments.

Online publication: 2016
Publication type : full_text
Public price (Euros): 0.00

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