C30 concrete should be prepared for 100t cement, 250t sand and 300t stone in a construction site. The starting mix ratio is 1:2.04:3.47, and the cement consumption per cubic meter is 350kg How many cubic meters of concrete can be mixed with the materials stored in the next yard?

C30 concrete should be prepared for 100t cement, 250t sand and 300t stone in a construction site. The starting mix ratio is 1:2.04:3.47, and the cement consumption per cubic meter is 350kg How many cubic meters of concrete can be mixed with the materials stored in the next yard?

The mixture ratio is 1:2.04:3.47,
Converted into material consumption: per cubic meter: cement consumption = 350kg * 1 = 350kg, sand consumption = 350 * 2.04 = 714kg, stone consumption = 350 * 3.47 = 1214.5kg
Calculation of available material production:
Cement 100t / 0.35 = 285.7m3
Sand 250t / 0.714 = 350.1m3
Stone 300t / 1.2145 = 247.0m3
It can be seen that the quantity of stones is the least, which restricts the production of 247 cubic meters of concrete

In the design of a concrete mix proportion, it is known that the unit water consumption is 180kg, the water cement ratio is 0.7, and the mass sand ratio is 35%. According to the mass method, the unit stone consumption is () kg, and the apparent density of concrete is 2400KG / m. A.687 b.733 c.1276 d.1362

180 / 0.7 = 257kg cement
Concrete bulk density: 2350-2450, take the middle value of 2400KG / m3
2400-180-257 = 1963kg, which is the total weight of sand
1963 * 35% = 687kg this is the weight of sand
1963-687 = 1276kg this is the weight of the stone

When C30 concrete is prepared, the unit water consumption is 180kg, the water cement ratio is 0.45, the sand ratio is 35%, and the apparent density of concrete is 2400KG / m3 without admixtures, the unit sand consumption is () kg

45 = 400, cement dosage 400kg, apparent density 2400, sand dosage 2400-400-180 = 1820kg, sand ratio 35%, sand dosage 1820 × 35% = 637kg