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When used with an effectiveness index (EI), the dielectric constant (DC) is a valid means to measure curing membrane performance, say Alireza Joshaghani, Richa Bhardwaj, Dan Zollinger, Ph.D., P.E., Zachry Department of Civil Engineering at Texas A&M University, and Anol Kanti Mukhopadhyay, Texas A&M Transportation Institute, in their TRB paper.
"Therefore, a new curing membrane protocol is needed to evaluate the quality of curing under a range of the weather conditions (i.e., temperature, relative humidity and wind speed), as well as the curing compound quality within a single index representing the effectiveness of the curing process," that is, the effectiveness index.