M20 give you strength of 20Mpa and M25 give you strength of 25 Mpa after 28 days of curing.
90 miles taking this route:Take A264 from Horsham to M25 via M23. Once you are at M25, follow signs to M25 to MAIDSTONE (via M20).Take M25 to M20 to DOVER via M26 at J5.Take M20 & A20 to Dover.
100 miles taking this route:Take A10 LONDON, from Hertford, to M25(E) STANSTED AIRPORT (to M20).Take M25 (London Orbital), around London, to M20 to DOVER and the CHANNEL TUNNEL at J3.Take M20/A20 to DOVER.
130 miles taking this route:Take A12 LONDON, from Ipswich, to M25 at J11 in London; follow signs to M25 (S) to DARTFORD CROSSING (to M20).Take M25 down to M20 to DOVER and the CHANNEL TUNNEL at J3.Take M20 & A20 to Dover.
270 miles taking this route:Take M4(E) CARDIFF, from Swansea, to M25(S) GATWICK AIRPORT at J4B.Take M25 (London Orbital), around London, to M20 to the CHANNEL TUNNEL and DOVER, via M26 (at J5 on M25).Take M20/A20 to DOVER.
It depends on the Grade of Concrete. general grades are M15, M20, M25 etc. here are the nos. of bag required -------------------Bag for 1 cum---------------Bag for 5 cum M15------------------- 6.4----------------------------32 M20-------------------- 8-----------------------------40 M25--------------------12----------------------------60
m15- 6.25 m20 - 6.8 m25 - 7.5 m30- 8.5 m35- 9 m40 - 10
197 miles via the CHUNNEL, M20 (W), M25 (N), A12 (E)
225 miles taking this route:Take M4 (EAST) from Swansea to M25 (SOUTH) towards GATWICK (airport) and HEATHROW (airport) (Terminals 4, 5 & Cargo) at JCT 4B outside of London.Take M25 to M20 to MAIDSTONE CHANNEL TUNNEL and DOVER via M26 (JCT 5 on M25).Take M20 to Folkestone.
M2,m20,m25,m26
M20 refers to the grade of the concrete generally used in construction purpose. Here, M refers to mix & number 20 refers to the characteristic strength of concrete. the proportions of this grade is (1:1 1/2: 3). Along with this there are some more grades used in constructions i.e., M5, M7.5, M10, M15, M25, M30................. M80
For nominal Mix Cement consumption for M25 will be 570 kg per cum. and for Design Mix it can be optimised to 510 kg per cum.
190 miles taking this route:Take M4 LONDON, from Bristol, to M25(S) GATWICK @J4B.Take M25, around London, to M20 to the CHANNEL TUNNEL and DOVER (via M26 @ J5).Take M20 to the CHANNEL TUNNEL @J11A.