TY - JOUR
T1 - An electrical impedance investigation into the chloride ion transport resistance of alkali silicate powder activated slag concretes
AU - Ravikumar, Deepak
AU - Neithalath, Narayanan
N1 - Funding Information:
The authors sincerely acknowledge the funding from New York State Energy Research and Development Authority (NYSERDA) towards the conduct of this study. The materials were supplied by Holcim US and PQ Corporation, which is gratefully acknowledged. The experimental work was carried out in the Laboratory for the Science of Sustainable Infrastructural Materials (LS-SIM) at Arizona State University (ASU). 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 2017 Elsevier B.V., All rights reserved.
PY - 2013
Y1 - 2013
N2 - The chloride transport resistance of alkali silicate powder activated slag concretes is evaluated. Two different Na2O-to-source material ratios (n) and two SiO2-to-Na2O ratios of the activator (M s) are used on concretes proportioned using two slag contents (300 kg/m3 and 400 kg/m3). Rapid chloride permeability (RCP) and non-steady state migration (NSSM) tests are used to evaluate the chloride transport behavior. Alkali silicate powder activated concretes demonstrate comparable or better chloride transport resistance than OPC concretes when evaluated using RCP and NSSM tests. The relationships between the activator parameter, n·Ms, and the critical pore sizes (dcl) or the RCP and NSSM values demonstrate similar trends showing the influence of dc in determining the ionic transport response. Electrical impedance spectroscopy (EIS) is used to relate the material response before and after the transport tests, and equivalent circuit models are used to extract the parameters that relate to the pore structure. EIS coupled with circuit modeling clearly brings out the differences between the RCP and NSSM test on their influences in the microstructure of alkali activated slag concretes.
AB - The chloride transport resistance of alkali silicate powder activated slag concretes is evaluated. Two different Na2O-to-source material ratios (n) and two SiO2-to-Na2O ratios of the activator (M s) are used on concretes proportioned using two slag contents (300 kg/m3 and 400 kg/m3). Rapid chloride permeability (RCP) and non-steady state migration (NSSM) tests are used to evaluate the chloride transport behavior. Alkali silicate powder activated concretes demonstrate comparable or better chloride transport resistance than OPC concretes when evaluated using RCP and NSSM tests. The relationships between the activator parameter, n·Ms, and the critical pore sizes (dcl) or the RCP and NSSM values demonstrate similar trends showing the influence of dc in determining the ionic transport response. Electrical impedance spectroscopy (EIS) is used to relate the material response before and after the transport tests, and equivalent circuit models are used to extract the parameters that relate to the pore structure. EIS coupled with circuit modeling clearly brings out the differences between the RCP and NSSM test on their influences in the microstructure of alkali activated slag concretes.
KW - Alkali activated slag
KW - Circuit models
KW - Electrical impedance Pore structure
KW - Non-steady state migration
KW - Powder activator
KW - Rapid chloride permeability
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U2 - 10.1016/j.cemconcomp.2013.06.002
DO - 10.1016/j.cemconcomp.2013.06.002
M3 - Article
AN - SCOPUS:84885387144
VL - 44
SP - 58
EP - 68
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
SN - 0958-9465
ER -