TY - JOUR
T1 - Fracture process zone and tensile behavior of blended binders containing limestone powder
AU - Das, Sumanta
AU - Aguayo, Matthew
AU - Sant, Gaurav
AU - Mobasher, Barzin
AU - Neithalath, Narayanan
N1 - Funding Information:
The authors gratefully acknowledge the National Science Foundation for the financial support for this research (CMMI: 1068985 ). The materials were provided by U.S. Concrete, OMYA A.G, Headwaters Inc., and Burgess Pigments, and are acknowledged. This research was conducted in the Laboratory for the Science of Sustainable Infrastructural Materials and the Structural Engineering Laboratory at Arizona State University and the supports that have made these laboratories possible are acknowledged. 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.
Publisher Copyright:
© 2015 Elsevier Ltd. All Rights reserved.
PY - 2015/7
Y1 - 2015/7
N2 - Abstract Higher volumes of limestone can be used as OPC replacement by exploiting its increased reactivity in the presence of aluminous sources, thereby ensuring property-equivalence or improvements (e.g., strength, ionic transport). To examine the improvements in matrix fracture response in blended binder systems, this study characterizes and quantifies the flexural fracture process zone (FPZ) using digital image correlation. For the traditional OPC mortar, the localized strain intensity in the crack vicinity is the highest, FPZ initiates at a lower crack mouth opening displacement (CMOD), and its width is the lowest, while OPC-limestone-metakaolin blends show the lowest localized strain intensity, higher CMOD at FPZ initiation, and the highest FPZ width. The ultimate tensile strain and tensile toughness, extracted via inverse analysis, are found to be the highest for the ternary blends. The tensile modulus and the area under the softening region of the tensile constitutive relationship correlate well to the FPZ parameters.
AB - Abstract Higher volumes of limestone can be used as OPC replacement by exploiting its increased reactivity in the presence of aluminous sources, thereby ensuring property-equivalence or improvements (e.g., strength, ionic transport). To examine the improvements in matrix fracture response in blended binder systems, this study characterizes and quantifies the flexural fracture process zone (FPZ) using digital image correlation. For the traditional OPC mortar, the localized strain intensity in the crack vicinity is the highest, FPZ initiates at a lower crack mouth opening displacement (CMOD), and its width is the lowest, while OPC-limestone-metakaolin blends show the lowest localized strain intensity, higher CMOD at FPZ initiation, and the highest FPZ width. The ultimate tensile strain and tensile toughness, extracted via inverse analysis, are found to be the highest for the ternary blends. The tensile modulus and the area under the softening region of the tensile constitutive relationship correlate well to the FPZ parameters.
KW - CaCO (D)
KW - Fracture process zone
KW - Fracture toughness (C)
KW - Pozzolan (D)
KW - Tensile properties (B)
UR - http://www.scopus.com/inward/record.url?scp=84924965746&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84924965746&partnerID=8YFLogxK
U2 - 10.1016/j.cemconres.2015.03.002
DO - 10.1016/j.cemconres.2015.03.002
M3 - Article
AN - SCOPUS:84924965746
SN - 0008-8846
VL - 73
SP - 51
EP - 62
JO - Cement and Concrete Research
JF - Cement and Concrete Research
M1 - 4922
ER -