Development of apparent viscosity test for hot-poured crack sealants

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TypeTechnical Report
Physical description26 p.
SubjectMasony walls
AbstractThis 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.
Publication date
PublisherNational Research Council Canada
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AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC numberNRCC 53255
NPARC number20374664
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Record identifier369d1660-01b0-45b0-b5ae-9e9035bfe4e0
Record created2012-07-23
Record modified2017-07-05
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