Superpave Mix Design
LABORATORY REPORT
SUMMARY
This lab report was conducted to design Hot Mix Asphalt for a project in Fayetteville, Arkansas. The tests were conducted in compliance with current specifications for Superpave set forth by AASHTO and AHTD.
The topics covered in the lab report are selection of materials, selection of mix design, and final recommendation.
Even though other properties of the mixture just meet the Superpave design requirements, no job mix formula is drawn from this mix design because the dust proportion of the mixture is far out of the requirements. We may need to change the blend gradation of aggregate.
The blend in this mix design produced a gradation, as shown in Figure 1, that was close to the maximum criteria for the 2.36mm sieve and the 0.075mm sieve and passed above the restricted zone, so this blend was probably a fine blend. Therefore, the dust proportion of mixture was so high that it was far out of the requirements. We may need to change the cold feed so that a new gradation will pass under the gradation of this mix design. Moreover, the new gradation needs to meet the requirements for gradation and consensus/source properties that this blend gradation did not meet and to give safety rooms for other properties of mixture because the construction may have serious problems when most properties of this mix design are just on the criterion lines.
1
LABORATORY REPORT
A. OBJECTIVE This lab report was conducted to design Hot Mix Asphalt for a project in Fayetteville, Arkansas. The tests were conducted in compliance with current specifications for Superpave set forth by AASHTO and AHTD. B. APPLICABLE SPECIFICATIONS 1. Applicable Specifications for Testing: a. AHTD 465: Procedure for Sampling by Random Number Table b. AASHTO T 2 – 91: Standard Specification for Sampling of Aggregates c. AASHTO T 248 – 95: Standard Method of Test for Reducing Samples of Aggregate to Testing Size d. AASHTO T 11 – 91: Standard Specification for Materials
SUMMARY
This lab report was conducted to design Hot Mix Asphalt for a project in Fayetteville, Arkansas. The tests were conducted in compliance with current specifications for Superpave set forth by AASHTO and AHTD.
The topics covered in the lab report are selection of materials, selection of mix design, and final recommendation.
Even though other properties of the mixture just meet the Superpave design requirements, no job mix formula is drawn from this mix design because the dust proportion of the mixture is far out of the requirements. We may need to change the blend gradation of aggregate.
The blend in this mix design produced a gradation, as shown in Figure 1, that was close to the maximum criteria for the 2.36mm sieve and the 0.075mm sieve and passed above the restricted zone, so this blend was probably a fine blend. Therefore, the dust proportion of mixture was so high that it was far out of the requirements. We may need to change the cold feed so that a new gradation will pass under the gradation of this mix design. Moreover, the new gradation needs to meet the requirements for gradation and consensus/source properties that this blend gradation did not meet and to give safety rooms for other properties of mixture because the construction may have serious problems when most properties of this mix design are just on the criterion lines.
1
LABORATORY REPORT
A. OBJECTIVE This lab report was conducted to design Hot Mix Asphalt for a project in Fayetteville, Arkansas. The tests were conducted in compliance with current specifications for Superpave set forth by AASHTO and AHTD. B. APPLICABLE SPECIFICATIONS 1. Applicable Specifications for Testing: a. AHTD 465: Procedure for Sampling by Random Number Table b. AASHTO T 2 – 91: Standard Specification for Sampling of Aggregates c. AASHTO T 248 – 95: Standard Method of Test for Reducing Samples of Aggregate to Testing Size d. AASHTO T 11 – 91: Standard Specification for Materials