The ASR test at 60°C and nearly 100% humidty is state of the art for predicting risks of alkali silica reactivity in concrete.
Schleibinger, in ccoperation with BAM, the German Federal Institute for Material Research, has now clearly improved this test.
Up to now the spcemen must be taken out of the test chamber periodically each 28 days for 140 days. Then the length change of each specimen must be measured in teh range and accuracy of several Mikrons.
You got only 5 measurement days in 140 days. This procedure was difficulty to handle with a high risk of failures.
Wilma Wallau, Stephan Pirskawetz, Katja Voland, Birgit Meng, Continuous expansion measurement in accelerated concrete prism testing for verifying ASR-expansion models, Materials and Structures, Open AccessOriginal Article, First Online: 14 June 2018, https://doi.org/10.1617/s11527-018-1205-0
Krütt, E., Wallau, W., Meng, B., Greim, M. and Pirskawetz, S. (2019), Automatisierte AKR‐Prüfung im 60 °C‐Betonversuch. Beton‐ und Stahlbetonbau, 114: 911-918. doi:10.1002/best.201900040 (Abstract English, Text German)
room temperature up to max. 65°C
|temperature deviation||< 1 K|
|Accuracy of the temp. measurement||0.3 °C|
|Outer size (L x W x H)||85 x 63 x 64 cm|
|Water volume||9 l|
|Voltage||200-240 V~ (110V on request)|
|Electrical power||340 W @ 230V|
|Basic distance||0.3 mm|
|Measruement range||3 mm|
|Linearity over full scale||<= 0,25% = 7.5 µm|
|Reproducability||<= 0,05% of full scale|
|Temperature stability||0,025% of full range / K|
|Range of temp. compensation||+10..+125 °C|
|Envirinmental cond. of the sensor||-30°C ..+125°C|
|Environmental cond. controller||-20..+70°C|
|Specimen size (L x W x H)||75 x 75 x 280 cm|
|Outer dimensions (L x W x H)||186 x 186 x 446 cm|
|Water volume||0.25 l|
The AKROMAT data logger is recording the data from the 6 Eddy current sensors and of 2 (max. 6) temperature channels.
The data aquisition can be started and stopped indepnently for each channel / specimen.
If the limit of 0.3 mm/m expansion is exceeded, an alarm message s triggered. The AKROMAT data logger has a network connection and a built in WEB server.
No extra software required. Simply connect the data-logger to your PC or lab network and start any browser like Chrome (R), Firefox, Opera, etc.
The data can be shown in your browser as text or graphically. You export the date to Excel (R) or any other PC programm with one or two mouse clicks.
|Hardware requirements||PC or lab network. No Internet connection required.|
|Software||Windows 7..10, Linux, MacOS, Android with Edge, Firefox, Chrome, ...|
|TCP/IP||fix IP address or DHCP|
|Dimensions||24 x 21 x 6 cm|
|Power||90..240V AC / 50..60 Hz|
Scope of delivery: Data-Logger for 6 AKROMAT container, user manual, network cable, power-supply.