What is Material Calculation In Civil?
In civil material calculation, especially when it comes to concrete material calculation, it involves determining the required quantities for various tasks such as Concrete, Bar Bending, Plumbing, Flooring, and Electrical.
Material Use in Concrete?
When considering the materials for concrete, it’s composed of different parts of one product. All materials, namely Cement, Sand, Aggregate, Water, and Addmixuer, form a part of concrete.
Concrete is defined as a different grade like M15, M20, M25, as per IS Code 456. All concrete Grade different mix designs. All mix design different materials, different positions.
All different material types of measurement units like Water measurement in liter and Cement in Bag, Aggregate in k.g. But Concrete is a measurement in Cubic Meter.
How to Concrete Material Calculation?
For concrete quantity calculation, especially for specific grades like M 15 concrete, the first step is to determine the proportions of material. For instance, M 15 ratio is 1 : 2 : 4, while M20 is 1 : 1.5 : 3, and so on. Above M 25 Grade concrete requires a mix design.
Here 1 : 2 : 4 is Material how to define which material first number 1 is a Cement, Secon number material is a Fine Aggregate (Sand), here the third number is Coarse Aggregate, as per the sequence of proportions.
This method is based on a principle that the volume of fully compacted concrete is equal to an absolute volume of all the materials of concrete, i.e., cement, sand, coarse aggregates, and water.
This concrete structure may consist of footing, slabs, columns, beams, and foundations, etc. based on the types of structure.
A volume of concrete required for concrete structure may be calculated by summing up to the volumes of each structural member or each part of members.
The volume of a rectangular cross-sectional member may be calculated as Length x Width x Height/Depth/Thickness. The suitable formula shall be used for different cross-sectional shapes of members.
The formula for concrete material calculation for the required volume is given by:
Vc =Volume of Concrete
Vce = Volume of CementÂ
Vf = Volume of Fine AggregateÂ
Vca = Volume of Coarse Aggregate Â
Vw = Volume of Water
Sc = Specific Gravity of Concrete
Sce = Specific Gravity of CementÂ
Sf = Specific Gravity of Fine AggregateÂ
Sca = Specific Gravity of Coarse Aggregate
ce= CementÂ
f = Fine AggregateÂ
ca = Coarse AggregateÂ
dr = Dry Volume
we = Wet Volume
sa =Sum propositions Ratio
Above all Short Form Use in Equation
Lest Go Find Materials of Cement in Concrete
First Grade of Concrete
So We Going M-15 Grade of Concrete.
M-15 Concrete Propositions ratio 1:2:4 (ce:f:ca)
Here, 1 is a Cement, 2 is a Fine Aggregate, 4 is a Course Aggregate.
Dry Volume of concrete = Wet Volume of Concrete X 55 % (Because of working time Dry Volume less as per using qty so, we need 30% and 25 % of wastage qty, Here 30% + 25% = 55% access of this qty)
Sum propositions Ratio (sa)Â = 1+2+4 = 8
Vce = Volume of Cement / Cement Volume
Vce =Â dr x (ce/sa) Cu.m.
Vce = 1.55 x (1/8) Cu.m.
Vce = 1.55 x 0.125 Cu.m.
Vce = 0.19375 Cu.m.
How to Converter Cement Qty in Cu.m. to Bag
The volume of Cement Cu.m. = 0.034722 x Cu.m. qty (0.0347222 is Volume of qty for one bag)
How to find 0.034722 = 50/1440 (Each Cement Bag Weight = 50 kg, Density of Cement / Cement Volume = 1440 kg/ Cu.Meter., Volume of Cement Bag in Cubic Feet = 35.3147 )
Vce in bag = 0.19375 x (1/0.034722)
Vce in bag = 5.58 bag
orÂ
Vce in kg = 0.19375 x 1440 (1440 kg/Cu.m is a cement density)
Vce in kg =279 kg CementÂ
Vce in bag = 279kg /50kg (1 bag = 50 kg) = 5.58 Bag
Vf = Volume of Fine Aggregate/Sand
Vf = dr x (f/sa) Cu.m.
Vf = 1.55 x ( 2/8) Cu.m.
Vf = 1.55 x 0.25 Cu.m.
Vf = 0.3875 Cu.m. This qty of fin aggregate in Cu.m.Â
How to Find Fine Aggregate in Cu.m. to Kg
Sf = Specific Gravity of Fine Aggregate = 1700 kg/ Cu.m.
Vf in kg = 0.3875 Cu.m. x 1700 kg/ cu.m.
Vf in kg = 658.75 kgÂ
Vca = Volume of Coarse Aggregate Â
Vca = dr x (ca/sa) Cu.m.
Vca = 1.55 x (3/8) Cu.m.
Vca = 1.55 x 0.375 Cu.m.
Vca = 0.58125 Cu.m. This qty of Coarse Aggregate in Cu.m.
How to Find Coarse Aggregate in Cu.m. to Kg
Sca = Specific Gravity of Coarse Aggregate = 1650 kg/ Cu.m.
Vca = 0.58125 Cu.m. x 1650 kg/ Cu.m.
Vca in kg= 959.06 kg.
Vw = Volume of Water
w/c = 0.45 as per IS Code 456:2000 Table-5
Required water for 1 cement bag= 0.45 × 0.034722 = 0.015625 cum
1 Cu.m. water = 1000 litr.
Required water for 1 cement bag=0.015625 × 1000 = 15.63Litre.
Vw for 1 Cu.m. Concrete in Water = 15.63 litr x 5.58 bag = 87.22 litr
Vw = 87.22 litr
Summary of Using the concrete material calculator, the Concrete Material Calculation is as follows:
Vce in bag = 5.58 bag (Cement in Bag)
Vf = 658.75 kg (Fine Aggregate in kg)
Vca = 959.06 kg. (Coarse Aggregate in kg)
Vw = 87.22 liters (Water in Liter)
Frequently asked questions (FAQ) related to concrete material calculation in civil engineering:
Why is concrete material calculation important in civil engineering projects?
Concrete material calculation is crucial for determining the exact quantities of materials needed for construction projects. It helps in efficient resource utilization, cost estimation, and ensuring structural integrity.
What are the essential materials used in concrete?
Concrete primarily consists of cement, sand (fine aggregate), coarse aggregate (gravel or crushed stone), water, and sometimes admixtures for specific purposes.
How are concrete grades determined, and why are they important?
Concrete grades such as M15, M20, M25, etc., are determined based on the mix proportions of cement, sand, and aggregates. These grades signify the compressive strength of concrete after 28 days of curing. They are vital for meeting structural requirements and ensuring durability.
What is the process for calculating concrete material quantities?
The process involves understanding the mix design, determining the proportions of each material, calculating the volume of concrete required, and then converting it into quantities of cement, sand, aggregate, and water.
How is the volume of concrete calculated for different structural members?
The volume of concrete is calculated by multiplying the dimensions (length, width, and depth/thickness) of the structural member. Different formulas are used for different cross-sectional shapes, such as rectangular, circular, or trapezoidal.
What role does specific gravity play in concrete material calculation?
Specific gravity helps in converting the volume of materials into their equivalent weight. It is crucial for determining the mass of each material accurately.
Why is it essential to consider the wastage factor in concrete material calculation?
Wastage factors account for material losses during mixing, transportation, and construction processes. Considering wastage ensures that sufficient materials are available on-site and helps in avoiding delays due to material shortages.
What is the significance of the water-cement ratio (w/c) in concrete mix design?
The water-cement ratio influences the strength, workability, and durability of concrete. Maintaining the correct w/c ratio is essential for achieving the desired properties and performance of the concrete mix.
How can concrete material calculation contribute to sustainability in construction projects?
Accurate material calculation reduces unnecessary waste and promotes efficient resource utilization, which aligns with sustainable construction practices. It helps in minimizing environmental impact and conserving natural resources.
What are the common challenges faced during concrete material calculation, and how can they be addressed?
Common challenges include variations in material properties, changes in mix designs, and uncertainties in project requirements. These challenges can be addressed through regular updates on material specifications, collaboration with suppliers, and utilizing advanced software for calculations and simulations.
