An assessment of the portable seismic pavement analyzer (PSPA) was conducted on three military airfields in order to determine the feasibility of rapidly obtaining the modulus and flexural strength of Portland cement concrete (PCC) pavements. The PSPA is a nondestructive testing device that measures the seismic modulus of concrete pavements using ultrasonic surface waves. The objective of this research was to evaluate the PSPA as an alternative to core sampling. This would potentially reduce the amount of time required for field testing and eliminate the need for laboratory testing ofconcrete cores. Currently, there are no methods other than laboratory testing to determine the flexural strength of PCC. Laboratory and field test results from the PSPA investigation were used to form a relationship between PSPA modulus and flexural strength. Additional laboratory testing was conducted to check the validity of the new relationship. Results of the research showed that with the use of the PSPA, strength parameters of PCC canbe determined within a few seconds. The PSPA is a critical testing deviceneeded by pavement evaluation teams in order to determine PCC strength properties and complete military pavement evaluations in a more effective manner. For the covering abstract see ITRD E139491.
Samenvatting