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

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

Water content is water content. The water content of sand should be included in the construction mix proportion, and the water introduced by additives, and then the original water consumption should be subtracted from their total. If not added, the final sand consumption will be less, while the water consumption will be more, and the final strength will be lower than that added