National Research Council of Canada. NRC Institute for Research in Construction
Text, Technical Report
This report focuses on the development of the apparent viscosity test method. This test uses a modified version of the Brookfield rotational viscometer. Based on the results of this study, the measured apparent viscosity of hot-poured crack sealant using SC4-27 spindle at 60rpm (20.4s-1) at the recommended installation temperature was determined to be reasonably representative of sealant viscosity at shear rates resembling field application. To ensure measurement consistency and stability, a 20min melting time and a 30-s waiting time prior to data collection are recommended. To establish precision and bias for the test, a round robin testing was conducted among seven laboratories. Average coefficient of variation within and between laboratories was found to be 2% and 6%, respectively. Using the data from the round robintesting, and based on ASTM precision and bias standard (ASTM practices C802 and C670), maximumpermissible differences within a laboratory and between laboratories were found to be 4.6% and 16.9%.Considering the high polymer or crumb rubber content in crack sealants and sealant temperature sensitivity, the repeatability and reproducibility of the developed test is within an acceptable range. These values arecomparable to those of asphalt binder: 3.5% and 14.5% based on ASTM D4402-02 and 3.5% and 12.1% based on AASHTO 2006 T316.
University of Illinois at Urbana-Champaign. Illinois Center for Transportation
Civil Engineering Studies. Illinois Center for Transportation Series, no. ICT-08-027 (1 November 2008).
Al-Qadi, I. L., E. H. Fini, J.-F. Masson, A. Loulizi, K. K. McGhee, and M. A. Elsefi. ‘Development of Apparent Viscosity Test for Hot-Poured Crack Sealants’. National Research Council of Canada, March 2010. https://doi.org/10.4224/20374664.