Comparison of setting time measured using ultrasonic wave propagation with saw-cutting times on pavements.

Details

• Creators:
  Taylor, Peter ; Wang, Xuhao
• Corporate Creators:
  Iowa State University. National Concrete Pavement Technology Center
• Corporate Contributors:
  Iowa. Dept. of Transportation ; Iowa. Highway Research Board
• Subject/TRT Terms:
  • Sawed joints
  • Sawing
  • Setting (Concrete)
  • Ultrasonic waves
  • Field studies
  • Calorimeters
  • Contractors
  • Concrete pavements
  • Admixtures
• Publication/ Report Number:
  IHRB Project TR-675;InTrans Project 14-498
• Resource Type:
  Tech Report
• Geographical Coverage:
  Iowa
• Corporate Publisher:
  Iowa State University. Institute for Transportation
• Abstract:
  At present, there is little fundamental guidance available to assist contractors in choosing when to schedule saw cuts on joints. To ; conduct pavement finishing and sawing activities effectively, however, contractors need to know when a concrete mixture is going to ; reach initial set, or when the sawing window will open. Previous research investigated the use of the ultrasonic pulse velocity (UPV) ; method to predict the saw-cutting window for early entry sawing. The results indicated that the method has the potential to provide ; effective guidance to contractors as to when to conduct early entry sawing. ; The aim of this project was to conduct similar work to observe the correlation between initial setting and conventional sawing time. ; Sixteen construction sites were visited in Minnesota and Missouri over a two-year period. At each site, initial set was determined using a ; p-wave propagation technique with a commercial device. Calorimetric data were collected using a commercial semi-adiabatic device at ; a majority of the sites. Concrete samples were collected in front of the paver and tested using both methods with equipment that was set ; up next to the pavement during paving. ; The data collected revealed that the UPV method looks promising for early entry and conventional sawing in the field, both early entry ; and conventional sawing times can be predicted for the range of mixtures tested.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29593/dot_29593_DS1.pdf
• File Type:
  [PDF - 1009.57 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:d8fa505759a75cc4393c778c0f9c3bd0e06be234e18008e59700bf4ef69ddae66f94a7cf909236017d447539ea19a1ae411f675975bb6eb580b432e2982300ea