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Concrete Mix Design Calculation

This document outlines the steps to calculate a concrete mix design. It provides details on the materials used including aggregate properties and cement specifications. The design calls for a Class A concrete with a minimum compressive strength of 20.7 MPa. Calculations are shown to determine the absolute volumes and uncorrected weights of cement, sand, gravel, and water per bag of cement. Corrections are then applied based on moisture contents and absorption rates to determine the adjusted and corrected weights of materials per cubic meter of concrete.

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William Lim
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250 views3 pages

Concrete Mix Design Calculation

This document outlines the steps to calculate a concrete mix design. It provides details on the materials used including aggregate properties and cement specifications. The design calls for a Class A concrete with a minimum compressive strength of 20.7 MPa. Calculations are shown to determine the absolute volumes and uncorrected weights of cement, sand, gravel, and water per bag of cement. Corrections are then applied based on moisture contents and absorption rates to determine the adjusted and corrected weights of materials per cubic meter of concrete.

Uploaded by

William Lim
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Concrete Mix Design Calculation

1. Data of Materials

Coarse Aggregate Fine Aggregate


Specific Gravity 2.677 Specific Gravity 2.64
Moisture Content 1.19% Moisture Content 4.50%
Water Absorption 1.08% Water Absorption 2.733
Loose Unit Weight 1553.5 Loose Unit Weight 1680.5
Nominal Max Size 19mm Fineness Modulus 3.38
Abrasion Loss Cement
Type of Aggregate Angular Specific Gravity 3.02

2. Design Specification Requirement

Class of Concrete Class A


Minimum Compressive Strength 20.7 MPa
Cement Factor 9
Slump 75mm
Mass of 1 bag cement 40 kg
Required Amount of Water 199 kg

3. Design Mix Per Bag Cement

Absolute Volume of Concrete 1 = 0.1111 m3


Cf bag

Absolute Volume of Cement Wc = 0.013245 m3


Gc Pw bag

Absolute Volume of Water Wc = 0.022111 m3


CF Pw bag

Absolute Volume of Aggregate Vcon - (Vc+Vw) 0.075744 m3


bag

3
Absolute Volume of Sand Va*%FA 0.040871 m
bag

Absolute Volume of Gravel Va-Vs 0.034872 m3


bag
4. Net Water Cement Correction
Value 199.0 kg
4.1 Approximate Sand Content for Concrete
Fine Aggregate 51%
4.2 Percentage Sand Correction
a. Less Workable Concrete 0%
b. Manufactured Sand 0%

c. Water Cement Ratio w = 0.533


c

Difference w -0.57 -0.017


c

Percent Correction d x 1.0% -0.34%


0.05
d. Fineness Modulus
Difference FM - 2.75 = 0.63

Percent Correction d*.5% = 3.15


0.1

4.3 Total Correction of Fine Aggregate 53.96%

5. Uncorrected Weights of Material per Bag of Cement

Cement Wc= GcVcPc = 40 kg/bag


Sand Ws= GsVsPs = 107.9005 kg/bag
Gravel Wg= GgVgPg = 93.35361 kg/bag
Water Ww= GwVwPw = 22.11111 kg/bag

6. Adjusted Weights of Material per Bag of Cement

Cement Wc1= 40 kg/bag

Sand Ws1= Ws*(1 +MC/100) = 112.756 kg/bag

Gravel Wg1= Wg*(1+ MC/100) = 94.46451 kg/bag

Water Ww1= Ww- Ws*(MC-As)/100 - Wg*(MC-Ag)/100 20.10071 kg/bag


7. Corrected Weight of Materials per cu.m.

Cement Wc2= Wc1*CF = 360 kg/cu.m.

Sand Ws2= Ws2*CF = 1014.804 kg/cu.m.

Gravel Wg2= Wg2*CF = 850.1806 kg/cu.m.

Water Ww2= Ww2*CF = 180.9064 kg/cu.m.


***NOTHING FOLLOWS***

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