Measuring Long-Term Strength of Concrete Using Time-Domain Reflectometry

Back to all technologies
Download as PDF
63081
Current techniques for measuring the properties of concrete, such as water-cement ratios and compressive strengths, are often destructive and time consuming. New technologies are needed to increase the efficiency of concrete property testing.

Researchers at Purdue University have developed a method for measuring the water and cement content, water-cement ratio, and compressive strength of concrete from time domain-reflectometry in a nondestructive, quick manner. This method uses a step electrical pulse that is applied to a simple, rugged, disposable probe embedded in concrete and the principle of time-domain reflectometry to estimate the free water and the cement content that are used to calculate the water-cement ratio. Monitoring the signal and temperature with time allows for the calculation of long-term strength estimates based on the data gathered at short times, typically within one day.

Advantages:
-Nondestructive testing
-Fast test times

Potential Applications:
-Construction industry
-Cement companies
Feb 28, 2005
United States
7,289,916
Oct 30, 2007

Feb 28, 2005
PCT-Patent
WO
(None)
(None)

Feb 28, 2005
NATL-Patent
Canada
(None)
(None)

Feb 26, 2004
Provisional-Patent
United States
(None)
(None)

(None)
NATL-Patent
Australia
(None)
(None)
Purdue Office of Technology Commercialization
1801 Newman Road
West Lafayette, IN 47906

Phone: (765) 588-3475
Fax: (765) 463-3486
Email: otcip@prf.org