SmartBox™ | Wireless Concrete Resistivity

Wireless Concrete Resistivity

Giatec SmartBox™ is a compact wireless device for the measurement and monitoring of electrical resistance and temperature in fresh concrete. The continuous measurements are recorded on SmartBox™ and can be downloaded using the mobile application on Android smartphone/tablet.

The electrical resistivity of fresh concrete has been shown to provide a good indication on the water content as well as setting and hardening of concrete. SmartBox™ provides an efficient tool for various research studies in these areas.

Wireless monitoring of concrete resistivity and temperature Wireless monitoring of concrete resistivity and temperature Wireless monitoring of concrete resistivity and temperature Wireless monitoring of concrete resistivity and temperature SWireless monitoring of concrete resistivity and temperature Wireless monitoring of concrete resistivity and temperature

remove_circle_outlineadd_circle Applications

SmartBox™ can be used to monitor the electrical resistivity and temperature of fresh concrete. This can provide information on:

  • Water content in fresh concrete
  • Prediction of setting
  • Setting time measurement
  • Crack detection in concrete

remove_circle_outlineadd_circle Features

  • Wireless technology
  • Compact design
  • Simultaneous measurement of electrical resistance and temperature
  • Optimized frequency for fresh concrete
  • Long battery life on a single charge(about 3 months*)
  • Mobile application for Android smartphone and tablet
  • Easy data sharing
  • Patent pending

remove_circle_outlineadd_circle Standardization

    This method of resistivity measurement is not standardized and is suitable for various research applications. However, AASHTO TP 95-11 provides the test standard for surface electrical resistivity measurement. An ASTM standard is also under development for this test. A copy of the AASHTO test specification entitled "Standard Method of Test for Surface Resistivity Indication of Concrete's Ability to Resist Chloride Ion Penetration" can be obtained from here.

remove_circle_outlineadd_circle Technical Specifications

General
Reading Range Measurement Frequency Accuracy Measurement Time
1 – 3000 Ω 10 kHz ± 2% <1 second

Operating conditions
Type Value
Operating temperature -20 ~ 45 °C
Operating humidity 10 ~ 90%
Battery Charger Specification Input:100-240Vac (50-60Hz)/Output:5Vdc(500mA)
Dimensions of SmartBox™ unit 85 x 55 x 22 mm

remove_circle_outlineadd_circle Purchase Items

Part No. Item Description
900088 SmartBox™ Full Package SmartBox™ unit, Plastic spacer for rods, 10 pairs of customized rods, 10 temperature sensors, USB charger and cable, Ruggedized tablet, Android application for Tablet, user manual (Tablet is included)
900089 SmartBox™ Essential Package SmartBox™ unit, One pair of customized rods, Temperature sensor, USB charger and cable, Android application for Smartphone, user manual (Smartphone is not included)

The following replacement parts are available upon request:

Accessories
Part No. Item Description
900086 SmartBox™ Unit Measurement unit - should be purchased with one of the packages
900085 SmartBox™ rods 10 pairs of customized rods
900087 SmartBox™ temperature sensors pack of 10 temperature sensors

remove_circle_outlineadd_circle FAQ

Q1: How long is the battery life?
A: The battery life on a single charge is about 3 months for basic data log under room temperature.
Q2: What is the log interval for resistance and temperature?
A: The standard log follows this schedule:
a. First 24 hours: every 5 minutes
b. Next 72 hours: every 1 hour
c. After that: every 6 hours
We also have custom log which provides a fix log interval in minutes (1 min to a couple of days). This can be changed by the user in the app menu.
Q3: What is the maximum number of data that can be recorded on the SmartBox?
A: The device can store 1024 data points in the following format:
Time | Date | Temp (C) | Resistance (ohm)
10:20 | 10/02/2015 | 23 | 789

remove_circle_outlineadd_circle Publications

  1. M. Mancio, J. R. Moore, Z. Brooks, P. J. M. Monteiro, S. D. Glaser, : Instantaneous In-Situ Determination of Water-Cement Ratio of Fresh Concrete, ACI materials Journal (2010), 107, 587-593.
  2. Ranade, R., J. Zhang, J.P. Lynch, & V.C. Li (2014). Influence of Micro-Cracking on the Composite Resistivity of ECC. Cement and Concrete Research, 58, 1-12.
  3. Bentz, D. P.; Snyder, K. A.; Ahmed, A. M. (2014). Anticipating the Setting Time of High-Volume Fly Ash Concretes Using Electrical Measurements: Feasibility Studies Using Pastes J of Materials in Civil Engineering, 6 p
  4. Nikkanen, P. (1962). On the Electrical Properties of Concrete and Their Applications. Vaftion Tebsilliren Tutkirndaitos, Tiedotus, Sarja III, Rakennus 60, 75 pages. In Finnish with English summary.
  5. Andrade, C. (2010). Types of Models of Service Life of Reinforcement: The Case of the Resistivity. Concrete Research Letters, 1(2), 73- 80.
  6. Bertolini, L., & Polder, R. B. (1997). Concrete Resistivity and Reinforcement Corrosion Rate as a Function of Temperature and Humidity of the Environment. TNO report 97-BT-R0574, Netherland.
  7. Florida DOT FM 5-578. (2004). Method of Test for Concrete Resistivity as an Electrical Indicator of Its Permeability, 226.
  8. Forster, S.W. (2000). Concrete Durability-Influencing Factors and Testing. Farmington Hills, MI. Durability of Concrete, ACI Committee, Vol. 191, 1-10.
  9. Gowers, K. R. & Millard, S. G. (1999). Measurement of Concrete Resistivity for Assessment of Corrosion Severity of Steel Using Wenner Technique. ACI Material Journal, 96(5), 536-541.
  10. Hooton, R.D., Thomas, M.D.A., & Stanish, K., (2001). Prediction of Chloride Penetration in Concrete. Federal Highway Administration, Report No. FHWA-RD-00-142.
  11. Millard, S. G., Harrison, J. A., & Edwards, A. J. (1989). Measurements of the Electrical Resistivity of Reinforced Concrete Structures for the Assessment of Corrosion Risk. British Journal of NDT, 13(11), 617-621.
  12. Monfore, G. E. (1968). The Electrical Resistivity of Concrete. Journal of the PCA Research Development Laboratories, 10(2), 35-48.
  13. Morris, W., Moreno, E. I., & Sagues, A. A. (1996). Practical Evaluation of Resistivity of Concrete in Test Cylinders Using A Wenner Array Probe. Cement and Concrete Research, 26(12), 1779-1787.
  14. Nokken, M. R. & Hooton, R. D. (2006). Electrical Conductivity as a Prequalification and Quality Control. Concrete International, 28(10), 61-66.
  15. RILEM Technical Committee. (2005). Update of the Recommendation of RILEM TC 189-NEC Non-destructive Evaluation of the Concrete Cover (Comparative Test Part I, Comparative Test of Penetrability Methods). Materials & Structures, 38(284), 895-906.
  16. Sengul, O. & Gjorv, O. E. (2008). Electrical Resistivity Measurements for Quality Control During Concrete Construction. ACI Materials Journal, 105(6), 541-547.
  17. Sengul, O. & Gjorv, O. E. (2009). Effect of Embedded steel on Electrical Resistivity Measurements on Concrete Structures. ACI Materials Journal, 106(1), 11-18.

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