Experimental investigation on UHPC shrinkage of full-scale steel-UHPC composite bridge deck

Chuanxi Li; Yu Shi; Jiale Zhou; Changle Fang; Jun He; Longfei He

Developments in the Built Environment (Dec 2023)

Experimental investigation on UHPC shrinkage of full-scale steel-UHPC composite bridge deck

Chuanxi Li,
Yu Shi,
Jiale Zhou,
Changle Fang,
Jun He,
Longfei He

Affiliations

Chuanxi Li: Key Laboratory of Bridge Engineering Safety Control by Department of Education, Changsha University of Science & Technology, China; School of Civil Engineering, Changsha University of Science & Technology, China
Yu Shi: Key Laboratory of Bridge Engineering Safety Control by Department of Education, Changsha University of Science & Technology, China; School of Civil Engineering, Changsha University of Science & Technology, China; Corresponding author. Key Laboratory of Bridge Engineering Safety Control by Department of Education, Changsha University of Science & Technology, China.
Jiale Zhou: School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, China; Corresponding author. School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, China.
Changle Fang: Key Laboratory of Bridge Engineering Safety Control by Department of Education, Changsha University of Science & Technology, China; School of Civil Engineering, Changsha University of Science & Technology, China
Jun He: Key Laboratory of Bridge Engineering Safety Control by Department of Education, Changsha University of Science & Technology, China; School of Civil Engineering, Changsha University of Science & Technology, China
Longfei He: Key Laboratory of Bridge Engineering Safety Control by Department of Education, Changsha University of Science & Technology, China; School of Civil Engineering, Changsha University of Science & Technology, China

Journal volume & issue: Vol. 16
p. 100281

Abstract

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Three full-scale composite bridge deck segments with various steel-to-UHPC area ratios, as well as free shrinkage specimens, were tested to investigate the restrained shrinkage and cracking behaviors. Based on the measured UHPC strain and temperature, the variations in shrinkage strain were analyzed, and a time-varying analysis theory for calculating elastic modulus and shrinkage stress during UHPC curing process was proposed. The results revealed that UHPC free shrinkage strain (after 30 days) was within 700–750 με. The variation trend in UHPC elastic modulus and shrinkage stress were basically consistent the development of shrinkage strain. The shrinkage tensile stress at UHPC upper surface was approximately 2 MPa, equaling to the difference between cracking stress and axial tensile strength. Based on the free and restrained strains, a time-dependent equivalent stress method was found to be effective for calculating UHPC elastic modulus and shrinkage stress in the composite deck.

Published in Developments in the Built Environment

ISSN: 2666-1659 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Engineering (General). Civil engineering (General); Technology: Building construction
Website: https://www.journals.elsevier.com/developments-in-the-built-environment/

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