TY - JOUR
T1 - Fundamental insights into the compressive and flexural response of binder- and aggregate-optimized ultra-high performance concrete (UHPC)
AU - Arora, Aashay
AU - Yao, Yiming
AU - Mobasher, Barzin
AU - Neithalath, Narayanan
N1 - Funding Information:
The authors sincerely acknowledge the Arizona Department of Transportation (ADOT) for funding this research (Grant no: SPR 745 ). The materials used for this study were provided by U.S. Concrete, BASF Corporation, Salt River Materials Group, Burgess Pigments, and Omya A.G., and their contributions are acknowledged. The authors gratefully acknowledge the contribution of Mr. Manuel Padilla and Mr. Peter Goguen of GCTS in the compression experiments. Farrokh Kianmofrad and Khaled Al-Bannai helped with the mixing and casting of UHPC specimens. The contents of this paper reflect the views of the authors who are responsible for the facts and accuracy of the data presented herein, and do not necessarily reflect the views and policies of the funding agency, nor do the contents constitute a standard, specification, or a regulation.
PY - 2019/4
Y1 - 2019/4
N2 - Ultra-high performance concrete (UHPC) mixtures demonstrating more than 150 MPa compressive strength and 20 MPa flexural strength are proportioned with commonly available cement replacement materials (30% or 50%, mass-based replacement levels) and steel fibers using a recently developed combined binder and aggregate optimization approach. The compressive (axial) stress-strain responses of the unreinforced and fiber-reinforced UHPC mixtures, along with the calculated volumetric strains, are used to define two critical stress states – viz., crack initiation and crack damage stresses. The crack damage stress, being the threshold value at which unstable crack propagation begins, is suggested to be used as the true strength of UHPC in structural design. The influence of matrix composition and fiber volume on these parameters is brought out, to better elucidate the influence of material design on properties. Digital image correlation (DIC) on unnotched beams under flexure is used to show the fundamental differences in the matrix properties that lead to differences in strain localization. The beneficial influence of fibers on strain localization in UHPC mixtures is also brought out.
AB - Ultra-high performance concrete (UHPC) mixtures demonstrating more than 150 MPa compressive strength and 20 MPa flexural strength are proportioned with commonly available cement replacement materials (30% or 50%, mass-based replacement levels) and steel fibers using a recently developed combined binder and aggregate optimization approach. The compressive (axial) stress-strain responses of the unreinforced and fiber-reinforced UHPC mixtures, along with the calculated volumetric strains, are used to define two critical stress states – viz., crack initiation and crack damage stresses. The crack damage stress, being the threshold value at which unstable crack propagation begins, is suggested to be used as the true strength of UHPC in structural design. The influence of matrix composition and fiber volume on these parameters is brought out, to better elucidate the influence of material design on properties. Digital image correlation (DIC) on unnotched beams under flexure is used to show the fundamental differences in the matrix properties that lead to differences in strain localization. The beneficial influence of fibers on strain localization in UHPC mixtures is also brought out.
KW - Compressive strength
KW - Critical stress states
KW - Flexural response
KW - Stress-strain response
KW - Ultra high-performance concrete
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U2 - 10.1016/j.cemconcomp.2019.01.015
DO - 10.1016/j.cemconcomp.2019.01.015
M3 - Article
AN - SCOPUS:85060950922
VL - 98
SP - 1
EP - 13
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
SN - 0958-9465
ER -