Now we need to prepare M5 mixed mortar, the material is 325 ordinary cement, medium sand (moisture content is 2%, mass density is 1500kg / m3), trial calculation When the discharge capacity of the mixer is 350L, try to calculate the feeding amount of mixing once

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• 1. How to calculate the amount of sand in the mortar mix? Is it not the bulk density when it is dry? Why should the moisture content be added The mix proportion of cement lime mortar should meet the requirements of construction workability (consistency), ensure the design strength, save cement as much as possible and reduce the cost. The mix proportion of M7.5 grade cement lime mortar with consistency of 70-100 mm is used for masonry brick wall （1） Materials 1. Cement: 32.5mpa ordinary portland cement; 2. Lime paste: consistency 120mm; 3. Sand: medium sand, with a bulk density of 1450kg / m3 and a water content of 2%; 4. Construction level: General I don't understand the calculation of sand consumption The answer in the book is: according to the sand bulk density and moisture content, calculate the sand consumption QS QS =1450×(1+2%)=1479(kg/m3) But doesn't the amount of sand refer to the bulk density when it is dry? Why should 2% water be added? Isn't it the bulk density when the sand contains water? What's the matter
• 2. What is the range of bulk density and apparent density of 5-31.5 stones
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• 4. Calculate the density of small stones The mass of small stone is m = 21.6, the volume of water is v = 40, the volume of water and small stone is V2 = 47, the volume of small stone is v = 7, the density of small stone is p = m / v = density!
• 5. Calculation steps of compactness measurement by sand filling method Do not need to write detailed steps, just write the known water content, vertebral mass, cylinder + sand mass, sand density, calculation steps. Calculate wet density, dry density, compactness!
• 6. Compactness calculation formula: mass of soil * density of sand / what / data given by laboratory / (1 + 0.01%). What is the second one? Sand filling method
• 7. Calculation formula of compactness of earthwork subgrade (sand filling method),
• 8. What is the principle of measuring density by sand filling method? I can't find the problems in the exercises at the back of the book
• 9. What is dry density? Field dry density? Measured dry density? Maximum dry density? Wet density? And how to calculate the degree of compaction?
• 10. How many cubic meters is 1 ton pond slag equal to? Or the density of pond slag
• 11. 1-2 gravel density (natural accumulation is 1.423, seismic compaction is 1.573) to find out how many tons there are in one side. The meter stone density (natural accumulation is 1.412, seismic compaction is 1.550) is the same as 1.2
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• 16. Excuse me, what is the bulk density and compact density of sand? Online and so on! What is the bulk density and compact density of medium sand? What is the bulk density and compact density of 5-40mm gravel? What is the bulk density and compact density of 5-40mm pebbles?
• 17. What is the density of sand, stone, cement and water
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