Object: Costing of concrete cube & cylinder for compressive & tensile strength test.
Apparatus:
- Cube Mould
- Cylinder Mould
- Physical Balance
- Concrete Mixture
- Ramping Rod
Material:
Ingredients of concrete (cement, fine aggregate, coarse aggregate, water)
Theory and procedure :
Calculate the volume of cube from its dimensions which are 0.5’ height, 0.5’ length and 0.5’ width
V=L x W x H at least 3 samples are to be cast so
V3 = V x 3= _________ cubic fit,
V 3 = _________ cubic feet
Calculate the volume of cylinder from its dimensions which are 0.5’ Dia 1’ length
V= π/4 x d2 at least 3 samples are to be cast so
V3 = V x 3= _________ cubic fit,
V 3 = _________ cubic feet
Volume of 3cubes _____________ + volume of 3cylinders _____________
= total Volume ____________
Density of concrete = _________ lb/ft
Density = mass/volume
Mass = density x volume __________ x ___________ = ___________lbs
____________/2.2046 = kgs
Ratio = 1:2:4 and water cement ration is 0.5 so it can be written as 1:2:4:0.5
Cement will be taken as __________________ kgs
Fine aggregate will be taken as _____________ kgs
Course aggregate will be taken as _____________ kgs
Water will be taken as _____________ liters
All weighted materials should be mixed in mixer first without water and then add water. When you fell concrete is properly mixed pour it out and start filling the cube moulds & cylinder moulds. Fill 1/3 and ram it 25 times with steel rod do same after 2/3 is filled and also ram it for 25 times then put the moulds one by one on vibrating table.
After 24 hours take out concrete cubes & cylinders from mould and put them in water for ____ days.
Review Questions
- What is a standard density of concrete?
- What are the standard dimensions of a cube?
- Where do we use the cubical strength?
- What are the standard dimensions of a cylinder?
- Where do we use the cylindrical strength?
- What lessons do we learn from this test?
- How will you calculate the volume of Cylinder?
- How will you calculate the volume of Cube?