CONTROLLING AUTOGENOUS SHRINKAGE OF GREEN ULTRA- HIGH PERFORMANCE GLASS CONCRETE

Author(s): Arezki Tagnit-Hamou, Nancy Soliman, Hisseine Ousmane and William Wilson
Paper category: Proceedings
Book title: Proceedings of the 2nd International Conference on UHPC Materials and Structures (UHPC2018-China)
Editor(s): Caijun Shi and Baochun Chen
ISBN: 978-2-35158-219-0
e-ISBN: 978-2-35158-220-6
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 110
Total Pages: 1
Language : English

Abstract: Ultra-high-performance concrete (UHPC) is defined worldwide as concrete with superior
mechanical, ductility, and durability properties, making it a strong contender for many concrete
applications. The novel ecological UHPC using waste-glass materials ground to different
particle-size distributions (named ultra-high-performance-glass concrete or UHPGC) was
recently developed. UHPGC has several technological, economical, and environmental
advantages. For example, it reduces the production cost and carbon footprint of conventional
UHPC structures. Despite its outstanding properties, like the UHPC, UHPGC is designed with
a very low water-to-cement ratio and large amounts of cementitious materials, which increases
its tendency to undergo early-age shrinkage and cracking with a risk of decreasing its durability.
This study investigates an approach for mitigating autogenous deformations in UHPGC through
the use of a new nanocellulosic material, namely, cellulose filaments (CF). CF was incorporated
in a recently developed recycled glass-based UHPC at rates of 0% and 0.3 wt.% while the silica
fume (SF) content was varied from 15 to 25% of cement weight. Results demonstrated that CF
was particularly more beneficial in reducing autogenous shrinkage at early age (up to 7 days)
than at later ages. A reduction in autogenous shrinkage strains of up to 31–51% was obtained
between 1 and 7 days as compared to 11% at 91 days. While, the results indicated that adjusting
the SF content from 25 to 15% reduces the autogenous shrinkage –within the first seven days–by
up to 18%, but negatively affects the flexural capacity (32% drop).

Online publication : 2018
Publication type : full_text
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