Experimental evaluation of mechanical properties of Active alkali concrete pavement under high temperature

The use of conventional concrete has always faced challenges due to environmental pollution and low durability against corrosive chemical environments. In this regard, alkaline concrete with high properties and minimal environmental damage has attracted the attention of researchers. In the present laboratory research, a mixing design of control concrete and three mixing designs of reinforced slag concrete containing 0, 4 and 8% nanosilica were constructed. Three designs were selected from reinforced concrete and by adding 1 and 2% of polyolefin fibers to it, two more designs were made (designs 5 and 6). Concrete specimens were tested at 90 days of curing at room temperature and high temperature. The application of heat caused a decrease in the results so that, in high-strength concrete designs, the highest drop under the test of compressive strength, tensile strength and modulus of elasticity was 16, 21 and 42%, respectively, in Figure 2. Scanning electron images (SEM) of concrete microstructure were interpreted in overlap and coordination in interpreting the results of all tests.