MATERIALS FORMULATION AND SERVICEABILITY DESIGN FOR ULTRA-HIGH PERFORMANCE CONCRETE

Author(s): Yiming Yao, Aashay Arora, Narayanan Neithalath and Barzin Mobasher
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: 373-387
Total Pages: 15
Language : English

Abstract: Materials and mechanical design procedures for ultra-high performance cement composites
(UHPC) members based on analytical models are addressed. A procedure for the design of
blended components of UHPC is proposed using quaternary cementitious materials
incorporating commonly available cement replacement (fly ash, slag, microsilica, metakaolin)
and fine filler (limestone) materials. A packing algorithm is used to extract the number
density, mean centroidal distance, and coordination number of the microstructure. Similarly,
rheological studies on the pastes provide yield stress, plastic viscosity, and min-slump spread.
The blending procedures are based on a packing and rheology optimization approach, which
is flexible enough to allow users modify the constraints depending on the application.
Mechanical characterization is conducted on the developed UHPC mixtures by means of
compression, tension and bending tests. The multiple cracking and associated deflection
hardening behavior is characterized using digital image correlation (DIC) method. Closed-
form solutions of moment-curvature responses of UHPC are derived based on elastic-plastic
compressive model and trilinear strain hardening tension stress strain responses. Tension
stiffening behavior of UHPC due to fiber toughening and distributed cracking is then
incorporated in the cross-sectional analysis. Load-deflection responses for beam members are
obtained using moment-area, and direct integration approach. The proposed models provide
insights in the design of UHPC to utilize the hardening properties after cracking.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00