Durability

An Experimental Study on the Mechanical and Durability Properties of UHPFRC for cast-in-place method

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Abstract

In order to repair and reinforce concrete structure, research to develop a method to increase the thickness or replace the surface of concrete members by using UHPFRC has been started. The UHPFRC mix used in the research is characterized by its matrix densified by ettringite (AFt) formation; thus, it is called “Aft-UHPFRC”. The AFt-UHPFRC was originally developed for fabrication of precast members with thermal curing. The paper presents results obtained from a construction project and an experimental investigation in both of which cast-in-place UHPFRC is used. The construction project is to replace the 100-year-old suspension bridge with a girder bridge made of UHPFRC. The experimental investigation is carried out to develop an improving method of existing bridge decks. In order to understand the behavior and durability of cast-in-place AFt-UHPFRC, strength evolution, pore diameter distribution, shrinkage behavior and chloride penetration resistance were investigated. It is understood that the AFt-UHPFRC's excellent mechanical properties and durability are achieved even by cast-in-place method if the AFt-UHPFRC is properly cured at early ages.

Keywords: durability, chloride penetration, curing method, cast-in-place, UHPFRC

How to Cite:

Watanabe, Y., Makita, T., Fujiwara, H. & Yanai, S., (2019) “An Experimental Study on the Mechanical and Durability Properties of UHPFRC for cast-in-place method”, International Interactive Symposium on Ultra-High Performance Concrete 2(1). doi: https://doi.org/10.21838/uhpc.9643