### Investigation of the compressive strength of various mix ...

The compressive strength test results of M20 normal concrete (). Type of cylinder specimen Compressive strength (MPa) Symbol 7 days Avg. 14 days Avg. 28 days Avg. C1 (7,14,28) 18 21 26 C2 (7,14,28) 19 19 25 23 25 26 C3 (7,14,28) 20 23 27 Table 4 shows the compressive strength test results of M20 fiber concrete.