Prepreation
Design and Control of Concrete Mixtures
Calculate Air Content
to reduce segregation
kg (per unit of concrete)
NAIT Mix Design Handout
from Table 12-7: query for the min required cement (pay attention to the note)
Tool: Processon; Date: March 2017
water reducer agent agent (kg reduced to ml)
air entrainment agent (kg)
or
from Table 12-1: query for recommended air content category
Compare and Select the Greater
Estimate Admixture Content
calculate the required cement based on w/c ratio and the water content (after reduction adjustment)
max allowable air content for batch design
Use Standard Deviation to calculate f'cr
Air Entrained
Cast Strength Cylinders Speciment
air entrainment agent (kg reduced to ml)
12-6 Recommended Slumps for Various Type of Construction
Table 12-3 Relations Between Water to Cementing Materials Ratio and Compressive Strength of Concrete
Butter the Mixer
Choose Requried Compression Strength (f'cr)
ACI 211
Estimate Coarse Aggregate Content
%
Table 12-7 Minimum Requirement of Cementing Materials for Concrete Use in Flatwork
water (kg) refer to the value from the previous step
Add 1／2 of Initial Water to the Mixer
Determine Air Content
Proportioning
cement (kg)
f'c: specified comp. strength
Select Water Cement Ratio
kg (per unit of required concrete)
Run the Mixer
from Table 12-3: calculate max w/cbased on f'cr
When With Statistics Data:
Batching
Trial Mix
Perform Slump Test
Estimate Fine Aggregate Content
Portland Cement ConcreteMix Design ACI Method
Mix the Batch
input the dry bulk rodded density of CA
ACI 211.1
When No Statistics Data:
physical dimensions of concrete element
Sumarize Batch Amount
Fresh Concrete Testing
FA wet (kg)
Table 11-1 CSA A23.1-09 Exposure Classes
Table 12-4 Bulk Volume of Coarse Aggregate Per Unit Volume of Concrete
Compare and Select the Lower
all quantities other than FA are known
Until all ingredients are added
Add all of the air entraining agent to the initial water
Add All Coarse Aggregate
air content volume is calculated by percentage
Density Testing
Choose Maximum Aggregate Size
Use Table 12-11 to calculate f'cr
More Trial Bathes Test
Non Air Entrained
subtract the sum of 1 cub meters
Test Fresh Concrete
decimal #
purpose and environmental setting
requirement from table 12-1
Determine Density
Table 12-5 Approximate Water and Air Content Required for Different Slumps and Nominal Maximum Sizes of Aggregate
from Table 12-1: query for the max w/c ratio based on exposure class
the initial water will be added to mixer
Sample the Aggregate for Moisture Condition
Table 12-11 Required Average Compressive Strength f'cr
Compressive Strength Test
Add 1/4 of Cement
Slum Selection
Adjust for Aggregate Moisture
Calculate Cement Content
CSA A23.2-2C
water (kg)
Calculate Concrete Density
mix for a few revolutions
Calculate Water Content
CA wet (kg)
Compiled by Yun peng Qin
water reducer agent (kg)
