It can be seen that TESC sample with size of 200 100 15 mm3 was placed in central position of wooden-box top surface. Sample top surface was right inside the hollow PVC envelope, and the bottom surface was directly contacted with wooden-box inner air. Still, as shown in Fig. 3b and c, the rest surfaces covered inside hollow PVC envelope were coated with reflective paper to prevent heat transfer through them into wooden-box.
In this test, duration of heating process was 150 min. After that, infrared lamp was automatically switched off, and sample was naturally cooled down without auxiliary for another 75 min. NC and TESC-30 samples were prepared and cured in standard curing room till the day of testing (28 days).