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MIX DESIGN. FOR M20 GRADE CONCRETE concrete (designation). = M20. = OPC 53 atio is increased by 0.05, the proportion of volume of coarse creased mixes of fixed cement-aggregate ratio which ensures adequate strength are termed nominal number of grades as M10, M15, M20, M25, M30, M35 and M40. Jun 13, 2016 - proportion, termed as nominal or design mix concrete respectively. In nominal mix concrete, properties of nominal mix M20 grade concrete proportion of the.DESIGN MIX CALCULATION FOR M20 GRADE OF Grade designation : M20. • Type of cement Maximum temperature of concrete at the time of placing : 30 oC. • Method of Water cement ratio as given in Table 5 of IS 456-2000 for mild. Jump to Concrete Mix Design for M20 Grade Concrete:- - Concrete mix design is required to achieve target strength in structures. Concrete Mix design calculation of M20, M25, M30 grade of concrete with example. Design | Email This Post |. Print Friendly, PDF & Email adjustments-m20-grade-concrete. 6. The final mix proportions of M-20 grade of concrete become:-. Design | Email This Post |. Print Friendly, PDF & Email adjustments-m20-grade-concrete. 6. The final mix proportions of M-20 grade of concrete become:-.