Details:

Creators:
Jackson, Eric ; Mahoney, James
Jackson, Eric ; Mahoney, James Less -
Corporate Creators:
Connecticut Advanced Pavement Laboratory
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Acceptance Tests Hot Mix Paving Mixtures Mix Design Quality Assurance Quality Control Specifications
Publication/ Report Number:
CT-2263-F-11-9
Resource Type:
Tech Report
Geographical Coverage:
Connecticut
Corporate Publisher:
Connecticut. Dept. of Transportation
Abstract:
The acceptance testing of Hot Mix Asphalt (HMA) conducted at the HMA production facility is an

important portion of the overall acceptance process used by the Connecticut Department of

Transportation (ConnDOT) for paving projects. In 2004, ConnDOT made the decision to implement a

Quality Assurance (QA) approach to improve the quality of the construction of transportation

facilities in the state. Until the 2009 paving season, ConnDOT had over 26 different Quality

Assurance/Quality Control (QA/QC) criteria that HMA producers must meet (within limits) or face

penalties, rejection of material or plant shutdown. In 2009, ConnDOT reduced the number of quality

assurance metrics from 26 to 8 for the 2009 construction season. These eight metrics are: Va

(Voids); VMA (Voids Mineral Agg); Gmm (Max Theoretical Gravity); Pb (Binder); and, four gradation

control points (each mix has four control points that define the mix). The objective of this study was

to statistically analyze HMA quality assurance data collected by ConnDOT from the 2007, 2008, 2009

and 2010 construction seasons to determine what impact the change in specifications had on the

variability and overall quality of the mixes being produced. The results of this study indicate there

is no overall statistically significant decrease in variability due to the 2009 specification changes.

However, there is also no significant increase in variability due to the reduced testing. According to

ConnDOT, these changes in specifications have eliminated costly plant shutdowns, a monetary

savings to producers that will hopefully be passed down to ConnDOT in reduced pavement costs.

Furthermore, the elimination of plant shutdowns will save ConnDOT and the traveling public costly

project delays due to material not passing stringent quality assurance metrics, while not impacting

the quality of pavement being placed.


Format:
PDF
Funding:
SPR 2263
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:7d97f0df34640c500d55cecfee0f047172529f1c10c3f3143033b54405031ab1
Download URL:
https://rosap.ntl.bts.gov/view/dot/27440/dot_27440_DS1.pdf
File Type:

Supporting Files

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