Concrete Resistivity Meter: Proceq Resipod, 1.5in (38mm)
What is Resistivity
Resistivity is a material property that measures how well a material resists the flow of electric current. In concrete structures, accurate resistivity is a critical parameter that affects the durability and corrosion resistance of reinforced concrete. Resistivity of concrete is influenced by the type of cement, aggregate and supplementary cementitious materials used, as well as the moisture content and temperature of the concrete. Accurate resistivity measurements are essential to assess the concrete’s ability to resist chloride ion penetration which directly affects its durability and life. Understanding resistivity is key to assessing the condition of concrete structures and predicting its life. Using a concrete specimen in resistivity measurements ensures reliable and consistent results to evaluate concrete performance.
Measuring Resistivity
Measuring resistivity is a crucial step in assessing the durability and corrosion resistance of concrete structures, especially those made of reinforced concrete. Resistivity of concrete is a measure of the ability of concrete to resist electric current flow which is closely related to its electrical conductivity. Resistivity of concrete is an important parameter to evaluate concrete performance as it can indicate the likelihood of reinforcing steel corrosion. Higher resistivity generally means lower corrosion risk and lower resistivity means higher corrosion risk. Use of supplementary cementitious materials like fly ash or silica fume can affect the resistivity of concrete making it more resistant to chloride penetration. Concrete resistivity meters like Resipod meter are used to measure the resistivity of concrete. These meters use a four-probe Wenner array to measure the surface electrical resistance of concrete, a reliable method to assess resistivity.
Proceq Resipod Concrete Resistivity Meter, 1.5" (38mm)
The Proceq Resipod Concrete Resistivity Meter measures the resistivity of concrete surfaces which correlates to the rate of fluid permeability to chloride ion penetration. These properties allow for reliable predictions of chloride diffusion in lab and in field and rate of reinforcing steel corrosion in concrete structures. The simple new test method is a fast, accurate and economical alternative to ASTM C1202 Rapid Chloride Permeability testing.Resistivity measurements can indicate corrosion rates and help assess the durability of concrete structures.
Bulk resistivity accessories enhance the functionality of the Resipod meter and allow for measurements under various conditions and improve the precision of resistivity readings.
Resipod readings from standard concrete test cylinders establish base resistivity values in the lab. The cylinders are still good for compressive strength and unit weight testing to verify mix design characteristics. Structural elements in the field are easily checked with the same meter to get comparative values of different concrete specimens.
Specific mix designs can be tested in the lab and areas within an existing structure can be quickly mapped for chloride induced corrosion of reinforcing steel.
The four-probe Wenner array of the Resipod measures the surface resistivity of concrete from 1 to 1000 kΩcm. Current is supplied at variable settings from 10 to 50µA or at full 200µA. Each contact point in the probe array has a small water reservoir to ensure good electrical contact with the specimen surface using electrodes. Up to 500 measurements are stored in the meter’s non-volatile memory. Resipod Link Windows-based software is included to download measurements to the PC for analysis and reporting. User defined correction factors can be defined in the software and uploaded to the device, in most cases minimizing the interference from the reinforcing steel. The rebar locator and covermeter is designed for precise detection and analysis of rebar locations and concrete cover.
One piece, handheld meter with rugged, IP67 rated waterproof enclosure and instant results on large 3.5 digit LCD display.
Available in two models for lab or field resistivity applications. Measurements are obtained in 2 seconds.
The device is also capable of on-site tests, ensuring accurate and reliable results in real-world environments.
HM-952 has the probe spacing fixed at 1.5in (38mm) as required in AASHTO T 358.
Features:
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Easy to use, little training required
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Fast and accurate measurement results
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Dedicated Windows-based software
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Includes access to Digital Pocket Thermometers for precise temperature testing
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Charger connects to standard USB computer or laptop ports via USB cable
Included Items:
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Resipod Concrete Resistivity Meter (38mm or 50mm Probe Spacing)
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Foam contact pads
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USB charger
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Resipod Link software
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Carrying strap
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Case* Range: 0.1 – 1000 kΩcm
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200μA ±0.2 kΩcm or ±1%
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50μA ±0.3 kΩcm or ±2%
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< 50μA ±2 kΩcm or ±5%
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40 Hz
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500 measured values
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50 hours autonomy
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USB type B, (5V, 100mA)
For full moisture analysis get the Humidity Monitoring with Tec RH Meter Kit.
3.5-digit LCD
40Hz
7.1 x 2.1 x 2.7in (197 x 53 x 69.7mm) WxDxH
Features and Applications
The Proceq Resipod is a concrete resistivity meter with many features and applications. Measures surface electrical resistance in lab and in the field. Rugged, waterproof enclosure and 3.5 digit LCD display. 2 models, 38mm and 50mm probe spacing. For engineers, researchers and contractors working with structures to check the condition and predict its life.
Also to assess to chloride ions penetration which is crucial to determine its durability and life in environments.
Probe Spacing and Accuracy
The probe spacing of a concrete resistivity meter is a key factor in the accuracy. A bigger sampling size, achieved with a larger probe spacing, will give a more representative of the concrete’s resistivity. However the probe spacing must be carefully chosen to avoid interference from the surface or other external factors. The Resipod has 2 models with different probe spacings, so you can choose the one that fits your application. The use of foam contact pads and conductive gel can also help to ensure good contact between the probe and the concrete surface, reducing the risk of inaccurate measurement. Regular calibration and maintenance of the meter is also essential to get accurate and reliable measurement. By choosing the right probe spacing and following the right procedure you will get accurate and reliable measurement of concrete resistivity which is key to assess the durability to corrosion of structures.
In summary, measuring concrete resistivity is key to assessing concrete durability to corrosion. A concrete resistivity meter like the Resipod will give you accurate and reliable readings of concrete resistivity so you can evaluate concrete performance and predict reinforcing corrosion. Additionally, using Concrete Maturity Meters is essential for monitoring the degree of hydration and strength of concrete. Make sure to maintain and calibrate your meter regularly.
Follow proper procedures: choose the right probe spacing, use foam contact pads and conductive gel to ensure good contact between the probe and the surface. By following these tips and using a good concrete resistivity meter along with the Concrete Penetrometer and the Windsor Probe Chart, you’ll get accurate and reliable readings of concrete resistivity and strength. Sign up for our newsletters or promotions to get exclusive deals and subscribe to our PC software to analyze and interpret your data and make informed decisions on concrete maintenance and repair.
