The electrical resistivity of concrete surfaces correlates directly to permeability, the likelihood, and rate of reinforcing steel corrosion, as well as chloride diffusion rate. The Resipod Meter by Proceq, available in two models, features a Wenner four-probe array fully integrated into an electronic meter with digital display, ready to use for laboratory or field resistivity applications. This simple new test method is based on resistivity readings from standard concrete test cylinders and is a fast, accurate, and economical alternative to ASTM C1202 Rapid Chloride Permeability testing. The same cylinder can be used for compressive strength testing, and structural elements in the field can also be checked with the same meter for comparative values. Specific mix designs can be evaluated in the lab, and areas within an existing structure can be quickly mapped for their susceptibility to chloride-induced corrosion of reinforcing steel.
Resistance in both models is measured from 1 to 1000 kΩcm and current is supplied at a variable 10 to 50µA or a full 200µA. The non-volatile memory stores up to 500 measured values for transfer to a PC using the included Resipod Link software.
The one-piece, handheld Resipod provides instantaneous and reliable readings on the unit’s large, 3.5-digit LCD display, and is housed in a rugged, IP67 rated waterproof enclosure. Each contact point of the probe array carries a small water reservoir to ensure reliable electrical contact with the specimen surface. The optional HMA-844 Geometric Accessory is a four-probe Wenner array attachment with probe spacing variable from 40 to 70mm (1.57 to 2.76in) for testing of a wide range of concrete sample types and mix designs. HMA-843 Bulk Resistivity Accessory used for taking resistivity measurements on 4x8in concrete cylinders is purchased separately and includes measurement plates with conductive foam inserts and an instrument stand with cable connections. Both accessories connect to the Resipod Meter for operation. The Resipod Meter Kit includes a test strip, foam contact pads, a charger with a USB cable, ResipodlLink software, carrying strap, documentation, and case. ResipodLink Windows-based software is used to download all measurements from the device to the PC for analysis and reporting. User-defined correction factors can also be defined in the software and uploaded to the device. The charger connects to standard USB ports on computers and laptops.
HM-952 has probe spacing fixed at 38mm (1.5in) as required in AASHTO T 358.
HM-954 comes with 50mm (1.97in) probe spacing. The wider spacing allows a greater sampling size but is still narrow enough to avoid interference from reinforcing steel in most cases.
- Easy to use, little training required
- Delivers fast, accurate measurement results
- Wide range of resistance measurement, 1 to 1000 kΩcm
- Dedicated Windows-based software
- The charger connects to a standard USB computer or laptop ports
- Resipod Concrete Resistivity Meter (38mm or 50mm Probe Spacing)