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Combined Aggregate Gradation
as a Method for Mitigating
Studded Tire Wear on PCC
WARD 663.2Keith W. Anderson
Jeff Sublayer
Mark Russell June 2009WSDOT Research Report
Office of Research & Library
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How to fill out combined aggregate gradation

How to fill out combined aggregate gradation
01
Step 1: Determine the combined aggregate gradation requirements specified in the project or design specifications.
02
Step 2: Collect the necessary materials for gradation testing, including sieves, sieve shakers, pans, and a balance.
03
Step 3: Start by weighing the empty pan and record the weight as W1.
04
Step 4: Weigh approximately 500 grams of the combined aggregate sample and record the weight as W2.
05
Step 5: Place the sample on the top sieve and set up the sieves in descending order of opening size.
06
Step 6: Cover the sieves and start the sieve shaker for a specific duration, usually 10-15 minutes.
07
Step 7: After sieving, remove each sieve from the stack and weigh the retained material on each sieve. Record the weights as R1, R2, R3, etc.
08
Step 8: Calculate the cumulative weight percentages for each sieve by dividing the retained weight on each sieve by the initial sample weight (W2) and multiplying by 100.
09
Step 9: Plot the cumulative weight percentages on a graph with sieve size on the x-axis and cumulative percentage on the y-axis.
10
Step 10: Analyze the gradation curve to determine if it meets the specified requirements. Adjust the mix proportions if necessary.
Who needs combined aggregate gradation?
01
Combined aggregate gradation is needed by civil engineers, construction companies, and paving contractors involved in designing and producing asphalt or concrete mixtures.
02
It is also important for quality control technicians, material testing laboratories, and government agencies responsible for ensuring the compliance of construction materials with standards and specifications.
03
Road construction projects, building construction, and infrastructure development often require the use of combined aggregate gradation to achieve the desired properties and performance of the finished pavement or concrete structure.
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What is combined aggregate gradation?
Combined aggregate gradation refers to the distribution of particle sizes in a soil, asphalt, or concrete mixture.
Who is required to file combined aggregate gradation?
Contractors or construction companies working on projects that involve the use of aggregates must file combined aggregate gradation.
How to fill out combined aggregate gradation?
To fill out combined aggregate gradation, one must conduct sieve analysis on the aggregates and report the percentages of each particle size.
What is the purpose of combined aggregate gradation?
The purpose of combined aggregate gradation is to ensure the proper distribution of particle sizes in a construction material for optimal performance.
What information must be reported on combined aggregate gradation?
The report on combined aggregate gradation must include the percentages of various particle sizes present in the aggregate mixture.
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