I cant accuratly help you with the cement content but you need about 1 ton of sand and 1 ton of stone for every cubic meter of concrete. The cement content would depend on what you are using the concrete for. At 15 newtons of strength you would ( and this is just an educated guess) need about 95kg of OPC cement, 85kg of GGBS slag, 1.5lt of WRA (water reducing agent) and about 70lt of water to gain a 50mm slump per cubic meter.
If I were you I would get it ready mixed. 70 Cube is a LOT of cocrete. Ready mixed 15 Newton concrete is about £75 inc vat per meter delivered.
Regards
Colin, a Tarmac concrete batcher.
15 milligrams
To determine how many 50 kg cement bags are required for 1 cubic meter of Grade 30 concrete, we need to break down the mix ratio and calculate the cement content based on that. Grade 30 Concrete Mix Ratio Grade 30 concrete typically has a mix ratio of 1:2:3 (Cement: Sand: Aggregate) by volume. This means: 1 part cement 2 parts sand 3 parts aggregate (gravel) However, the actual proportion of cement required can vary slightly depending on the specific mix design used by a contractor or engineer. For standard Grade 30 concrete, the cement content is typically around 350 to 400 kg per cubic meter. Since each cement bag weighs 50 kg, the number of bags required for 1 cubic meter of Grade 30 concrete would be: Number of bags = 350 kg / 50 kg = 7 bags
M20 - 6.20bags
For M25 grade concrete, the mix proportion is typically 1:1:2 (cement:sand:aggregate). This means for 1 cubic meter of concrete, you would need 1/4 cubic meter of cement. As 1 cubic meter is equivalent to 35.32 cubic feet, and one bag of cement usually covers around 0.035 cubic meters, you would need approximately 7-8 bags of cement for 1 cubic meter of M25 grade concrete.
For M10 (1:3:6) Grade of concrete cement bag consumed = 4.4 bags/cum M15(1:2:4) Grade of concrete cement bag consumed = 6.6 bag/cum M20(1:1.5:3) Grade of concrete cement bag consumed = 8.2 bag/cum
To calculate the amount of cement required for 1 cubic meter of M10 grade concrete, which has a mix ratio of 1:3:6 (Cement: Sand: Aggregate), you can use the following formula. The total parts of the mix are 1 + 3 + 6 = 10 parts. For 1 cubic meter, the volume of cement required is approximately 1/10 of the total volume, which is about 0.1 cubic meters. Given that the density of cement is around 1440 kg/m³, you would need approximately 144 kg of cement for 1 cubic meter of M10 concrete.
Well, you make a sidewalk from concrete, not just cement. Concrete consists of cement, sand, gravel and water. You will need 5.5 cubic feet of concrete. A standard sidewalk grade of concrete would be 1 part cement, 2 parts sand, 3 parts gravel- so the sidewalk needs 0.91 cu ft of cement- about 87 pounds worth- plus sand and gravel. If you want to buy the premixed bags of concrete (like Sacrete), you will need about 17 of the 40 pounds bags. And you did not ask, but 3 inches is kind of skinny- I would go for at least a 4 inch thick sidewalk.
M 15 grade proportion - 1:2:4 (cement:FA:CA)Cement required in kgs - 325 kg per cu.mNo. of bags required - 6.50
Which Grade?
in a simple way it is the strength of concrete, which it can bear the loads of its specified grade ex C 25 grade can resist the weight of 25kn/m2 after 28days of 60% after 7 days.
cement consumption in M-25
To make 1 cubic meter of concrete, you typically need about 1.5 cubic meters of sand and gravel combined. The general ratio for mixing concrete is 1 part cement, 2 parts sand, and 3 parts gravel. Therefore, for 1 cubic meter of concrete, you would need 0.5 cubic meters of cement, 0.75 cubic meters of sand, and 0.75 cubic meters of gravel.