Details:

Creators:
Masad, Eyad ; Kassem, Emad ; Chowdhury, Arif ; You, Zhanping
Masad, Eyad ; Kassem, Emad ; Chowdhury, Arif ; You, Zhanping Less -
Corporate Creators:
Texas Transportation Institute
Corporate Contributors:
Texas. Dept. of Transportation. Research and Technology Implementation Office
Subject/TRT Terms:
[+]
Aggregates Aggregates (Building Materials) Asphalt Concrete Asphalt Concrete--Evaluation Pavements Pavements--Performance--Texas
Publication/ Report Number:
FHWA/TX-09/0-5261-2
Resource Type:
Tech Report
Geographical Coverage:
Texas
Edition:
Technical report; Jan. 2008-Aug. 2008.
Corporate Publisher:
Texas Transportation Institute
Abstract:
This project aimed at providing better understanding of the factors affecting the uniformity and level

of compaction; and the performance of asphalt pavements. TxDOT research report 0-5261-1 documented

some of the findings of this research project. This research report documents the efforts and findings of

experiments conducted with more test sections. In the first phase of this report, a number of field test sections

were compacted, and field cores were extracted. These cores were scanned using X-ray Computed

Tomography (X-ray CT) to capture the air void distributions in these cores. The air void distribution

correlated well with the compaction effort across the mat. The compaction effort was found to be a function

of the number of roller passes and the relative location of each pass across the mat. The Compaction Index

(CI) developed in the TxDOT research report 0-5261-1 was used to quantify the compaction effort at any

point in the pavement. This index combines the number of roller passes along with the effectiveness of each

pass on the mat. The compactability of asphalt mixtures in the field correlated well with compactability of

asphalt mixtures in the laboratory. The CI was used to quantify the compactability of asphalt mixtures in the

field while the slope of the compaction curves obtained from Superpave Gyratory Compactor was used to

quantify the compactability of asphalt mixtures in the laboratory.

In the second phase of this report, the effect of different levels of compaction on the performance of

asphalt mixtures was studied using a fracture mechanics approach and DEM models. The results showed that

test specimens with less percent air voids performed better than the ones with higher percent air voids. In

addition moisture-conditioned specimens performed worse than the dry ones at the same compaction levels.

Furthermore, guidelines were developed to assist in predicting the compactability in the field based on

laboratory measurements during the mixture design stage; and to improve the field compaction.


Format:
PDF
Funding:
0-5261
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:21afe3b6e60ee97b5e7d3f30332c95b22953498d55e6cdfd56abbd64ef3e05a9
Download URL:
https://rosap.ntl.bts.gov/view/dot/16836/dot_16836_DS1.pdf
File Type:

Supporting Files

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