I am not an expert but from experience selling tiles the following are guidelines:
1. The type of surface determines how much cement to use
2.The quality of cement will also affect ratio
3.The area to be tiled e.g. wall or floor determines the quantity
on average 2-3 squares meters will require one 20Kg tile adhesive
FAR=Total floor area of building / Total lot area
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the p/a ratio is the sum of the perimeter divided by the area therefore if perimeter is 20m and the area 25m2 the sum is 20/25=0.8
The Vacuum Dewatered Flooring or VDF Flooring is a system for laying high quality concrete floors where the key is Dewatering of Concrete by Vacuum Process wherein surplus water from the concrete is removed immediately after placing and vibration, thereby reducing the water: cement ratio to the optimum level.
The following areas are to be excluded from gross floor area for the purpose of computing floor area ratio: (FAR)• Basement, underground parking, and attic spaces.• Porches, balconies, patios, breezeways, and decks (as well as overhangs, eaves, cantilevers, awnings and similarfeatures) with a "solid" cover but not enclosed by "solid" walls on more than two sides.• gardens which do not have a "solid" cover.• Parking structures and garages which are incidental to a primary use on the same site in multi-family, commercial,office, industrial and public/semi-public uses.• Air spaces within buildings such as vaulted ceilings or the air space above an atrium in an office or museum building.More specifically, the floor area shall be counted at the actual floor area only and not in the air spaces above.
The type of sand is also important. The right ratio for a mixture of cement and sand is 1:5 to 1:6
dust is not mixed in marble and cement mixture.
mixture of water-cement-fine sand in a certain ratio which is usable to fill gaps, voids and other repairing purpose
Sand / cement ratio = 3 , that means: 1 part of cement to 3 parts of sand by volume , with sufficient water to get workable mixture.
1:4 to 1:6 ratio of cement and sand.
water cement ratoi teel me water cement ratio formula
Target strength is the design strength which is determined by whom ever designed mixture of aggregates and the water/cement ratio.
Slump test
Formula of concrete ratio 1:2:4 means 1 part of cement, 2 parts of fine aggregate(sand) and 3 parts of coarse aggregate(gravel). Other examples of command concrete mixture ratio are 1:3:6 , 1:1.5:3 and 1:4:8. Water use in concrete mixture is based on water/cement ratio, for example 0.5 or 0.6.
The ratios of cement to sand to aggregate for the different grades of concrete are as follows. M10 has a ratio of 1:3:6. M15 has a ratio of 1:2:4. M20 has a ratio of 1:1.5:3. M25 has a ratio of 1:1:2, but M30 has no set ratio. It is a designed mixture to achieve the stress tolerance desired.
The acceptable standard is 4:1 (That is 4 wheelbarrows of sand to TWO bags cement) as the volume of a wheelbarrow is roughly double that of a 50kg bag of cement. Lots of builders get "confused" by this.
1:5 (cement:sand) is the best ratio