TY - JOUR
T1 - The fracture response of blended formulations containing limestone powder
T2 - Evaluations using two-parameter fracture model and digital image correlation
AU - Das, Sumanta
AU - Aguayo, Matthew
AU - Dey, Vikram
AU - Kachala, Robert
AU - Mobasher, Barzin
AU - Sant, Gaurav
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 Resources, 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.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/10
Y1 - 2014/10
N2 - The fracture response of mortars in which OPC is partially replaced by limestone or a combination of limestone and fly ash/metakaolin (i.e., for total OPC replacement levels of 20% and 35% by volume) is reported. The blended mortars demonstrate fracture parameters (fracture toughness, KIC S and critical crack tip opening displacement, CTODc, determined using the two-parameter fracture model, TPFM) that are comparable to or better than those of pure OPC formulations in spite of having slightly lower compressive strengths than the OPC systems. The ternary blends containing limestone and metakaolin at 20% OPC replacement show the best performance: a consequence of the beneficial limestone-alumina synergy that has been previously established. The strain energy release rates also show trends that are in line with the other fracture parameters. The fracture parameters for selected mixtures evaluated through a non-contact digital image correlation technique are found to correspond well to those determined from TPFM. The outcomes highlight that improved ductility can be attained through the judicious use of limestone and synergistic OPC replacement materials.
AB - The fracture response of mortars in which OPC is partially replaced by limestone or a combination of limestone and fly ash/metakaolin (i.e., for total OPC replacement levels of 20% and 35% by volume) is reported. The blended mortars demonstrate fracture parameters (fracture toughness, KIC S and critical crack tip opening displacement, CTODc, determined using the two-parameter fracture model, TPFM) that are comparable to or better than those of pure OPC formulations in spite of having slightly lower compressive strengths than the OPC systems. The ternary blends containing limestone and metakaolin at 20% OPC replacement show the best performance: a consequence of the beneficial limestone-alumina synergy that has been previously established. The strain energy release rates also show trends that are in line with the other fracture parameters. The fracture parameters for selected mixtures evaluated through a non-contact digital image correlation technique are found to correspond well to those determined from TPFM. The outcomes highlight that improved ductility can be attained through the judicious use of limestone and synergistic OPC replacement materials.
KW - Digital image correlation
KW - Fracture toughness
KW - Limestone
KW - Pore structure
KW - Two-parameter fracture model
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U2 - 10.1016/j.cemconcomp.2014.07.018
DO - 10.1016/j.cemconcomp.2014.07.018
M3 - Article
AN - SCOPUS:84907324318
SN - 0958-9465
VL - 53
SP - 316
EP - 326
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
ER -