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Electrical Testing Of Cement-Based Materials: Role Of Testing Techniques, Sample Conditioning, And Accelerated Curing, Robert Spragg, Yiwen Bu, Kenneth Snyder, Dale Bentz, Jason Weiss
Electrical Testing Of Cement-Based Materials: Role Of Testing Techniques, Sample Conditioning, And Accelerated Curing, Robert Spragg, Yiwen Bu, Kenneth Snyder, Dale Bentz, Jason Weiss
JTRP Technical Reports
These projects examined the potential for using electrical testing on concrete as a potential surrogate for obtaining information on ion and fluid transport. Electrical measurements are particularly attractive for use in quality control as they are easy to perform, are performed rapidly, and can be directly related to fluid transport. This work describes how electrical resistance measurements should be corrected for geometry to obtain a geometry independent resistivity or conductivity. Further, this work reviews and discusses several factors that influence the resistivity that is measured including porosity, pore connectivity, the role of temperature on degree of hydration (activation energy), temperature …
Post-Tensioning Technologies, Ryan W. Jenkins, Michael E. Kreger, Robert J. Frosch
Post-Tensioning Technologies, Ryan W. Jenkins, Michael E. Kreger, Robert J. Frosch
JTRP Technical Reports
Post-tensioned bridge construction has become increasingly popular and financially competitive with traditional prestressed concrete and steel plate girder bridges. Unfortunately, Indiana has experienced several construction-related problems in the few post-tensioned structures built, some of which have caused significant long-term durability concerns. Indiana’s problems have generally been attributed to a lack of a standard set of specifications for post-tensioned construction as well as inexperience and inadequate training of contractors and inspectors. These types of issues, however, were once more prevalent throughout the industry and much work has been accomplished in recent years to address these issues. This research program had two …