Determination of resistance to thermal shock

According to CEN EN 1367-5 (2011), test samples of aggregate particles 14 mm/10 mm and about 1000 g in mass are immersed in a water bath at room temperature for 2 0.5 h. They are then placed onto a pan and then in an oven after they have been surface dried with the aid of absorbent paper or cloth. 

After removing the aggregates from the oven, they are allowed to cool at room temperature. The procedure is repeated in 1000 g increments until a sufficient amount of aggregate for the fragmentation test according to CEN EN 1097-2 (2010) is obtained. 

Once a sufficient amount is obtained, the whole mass of aggregate is sieved through a 5 mm sieve. The mass passing through the sieve is recorded (M2). 

The percentage of undersized aggregates passing through the 5 mm sieve due to exposure to thermal shock is determined using the following equation  

the Los Angeles fragmentation test or the impact test is carried out on two test samples in accordance to CEN EN 1097-2 (2010). The first test uses aggregates that underwent thermal shock and the second one uses aggregates that did not undergo thermal shock. 

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CEN EN 1367-5.2011. Tests for thermal and weathering properties of aggregates - Part 1 Determination of resistance to thermal shock. Brussels CEN. 

DIN 51068-1-1976. Testing of ceramic materials determination of resistance to thermal shock water quenching method for refractory bricks. 

DIN EN 993-11. Methods of test for dense shaped refractory products -Part 11 Determination of resistance to thermal shock. 

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