Early detection of joint distress in portland cement concrete pavements.
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2015-03-01
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Abstract:INDOT (as well as several surrounding states) have observed that certain concrete pavements may show a susceptibility to joint ; deterioration. Unfortunately, by the time that this joint deterioration is observed it is often too late and costly partial depth repairs are ; needed. The deterioration is generally occurring in the joint behind the backer rod and joint sealant; as such, it is difficult to detect even ; if one is standing directly above the joint. This project investigated the use of electrical resistivity and ground penetrating radar as two ; techniques to detect premature joint deterioration. The thought process was that if the joint deterioration is determined at an early stage, ; low cost corrective actions can be taken to extend the life of the concrete. The electrical response was measured for mortars subjected to ; a temperature cycle from 23 °C to ‐35 °C, with varying degrees of saturation, and varying salt concentrations. The resistivity increased as ; the degree of saturation was reduced due to the reduction in the volume of the conductive medium and increase in tortuosity. Changes ; in resistivity were detected when cracking occurred in the sample. The magnitude of these changes was similar to that detected using ; changes in the ultrasonic wave speed. Ground penetrating radar (GPR) was used effectively to detect fluid accumulation in the saw‐cut ; joint behind the joint sealant. The typical GPR waveforms are however difficult and time consuming to interpret. A signal processing ; approach called, referred to as the CID, was used to obtain a single number that reflects the potential for fluid in the joint. Scalar waveform ; features and the computed CID can be used to estimate which joints may contain fluid thereby providing insights into which joint sealant ; sections may need to be repaired or when a sufficient number of joints may contain fluid suggesting a larger joint maintenance effort be ; performed to seal the joints or the concrete.
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Main Document Checksum:urn:sha256:434f15456349183d171b97a964711b9041c6367025cf6f8c7481306504ab4172