... N/mm2 ≤ 20 (20 ÷40] (40÷100] ≤ 20 (20 ÷40] (40÷100] XCT34 34 0-4 40 22 0 21 0 20 0 32 31 29 XCT38 38 0-5 00 24 0 23 0 22 0 26 25 23 XCT 42 420 - 520 26 0 25 0 24 0 23 23 22 XCT 52 520 - 620 360 350 350 22 22 21 CỐT ... C20 /25 C25/30 C30/37 C35/45 C40/50 C45/55 C50/60 fck (N/mm2) 20 25 30 35 40 45 50 fctm (N/mm2) 2, 2 2, 6 2, 9 3 ,2 3,5 3,8 4,1 fcm (N/mm2) 28 33 38 43 48 53 58 fctk,0,05 (N/mm2) 1,5 1,8 2, 0 2, 2 2, 5 ... 16,05 M150 B45 57,80 M600 B15 19 ,27 M200 B50 64 ,22 M700 B20 25 ,69 M250 B55 70,64 M700 B 22, 5 28 ,90 M300 B60 77,06 M800 B25 32, 11 M350 B65 83,48 M900 B27,5 35, 32 M350 B70 89,90 M900 B30 38,53 M400...