The Alcali Silica reaction occurs through alkali in the cement, reactive silica, and moisture in the aggregate. Active silica, alkali and moisture react together, and then they become gelatinous, which is a compound of alkali and silica. These compounds expand in the concrete and start to crack the concrete. The alkali-silica reaction is a long-term continuous process and once the cement starts to crack, there is no way to remedy it. Remedial measures must be taken during the design phase of the concrete.
ASR test chamber contains samples in an environment of %100 relative humidity
Between 20° C – 70° C, the accuracy is 0.5K.
The temperature is continuously saved and displayed as a graph.
ASR sample jars are made of 2mm thick stainless steel and have internal dimensions of 280 x 130 x 400
(length-and-height) cm.
The optional ASR steam discharge system can produce almost up to 100% moisture at 40C or lower air/water temperature. High pressure pump and stainlesss steel spray nozzle is provided with the instrument (1.2 lt. /h capacity).
Standards
| Aplication | Holding the ASR sample pots at 60oC and approx. %100 relative humidity According to RILEM/TC-ARP/01/20 ve ASTM C 1293 standards. |
| Size | 1500 x 1100 x 950 mm (length –with – hight) |
| Water level | 190 mm |
| Shelf for test pot | 2 pcs |
| Internal cabin | Stainless steel |
| Lid | Torque compensation hinge 750 x 120 |
| Sensor | RTD PT100 1/10 DIN B |
| Heating | 2 x 6 kW 3*230 V (or 400 V) excesive temperature protection |
| Controler- heater | 2 constant level relay 3 phase |
| Controler | Wall mountable cabin |
| User interface | Color, tactile screen and online graphic |
| Interface | Ethernet TCP/IP control and data collection |
| Weight | 500 kg |
| Electrical connection | 3 * 32 A 230 / 400 V, CEE socket |
Alkali-Silica Reaction Tester
An alkali-silica reaction test device is used to determine whether the sample containers have a reaction or not. One of the main reasons for using the device is that alkali in cement is formed together with active silica and moisture in aggregates, while some cracks may occur as a result of the combination of silica, alkali and moisture. In this case, it inevitably causes some problems such as swelling in concrete. Using the alkali silica reaction device, it is determined how the reaction level in the sample containers is.
What is Alkali-Silica Reaction?
In concrete aggregates, silica and concrete voids can combine. Naturally, this situation causes some problems such as swelling and cracking in concrete to come to light. As a result of the combined reactions, gel formation occurs in aggregate concrete together with the moisture effect. In the alkali-silica reaction, if cracks occur both long and continuously, then we can say that there will be no definitive solution unfortunately. For this reason, one of the most important solutions to be followed here is to take necessary precautions against reactions. You can determine the degree of reaction by performing alkali-silica reaction tests during the concrete design phase.
Alkali-Silica Reaction Tester Features
The alkali silica reaction test device, which will perform the reaction measurement processes, is also curious. We can say that it is a product made of 2 MM thick stainless steel. The internal size of the device is set as 280x130x400.
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