Details:

Creators:
Cooper, Samuel B.
Corporate Creators:
Louisiana Transportation Research Center
Subject/TRT Terms:
[+]
Asphalt Concrete Hot Mix Asphalt Loaded Wheel Tracking (LWT) Tests Semi-circular Bending (SCB)
Publication/ Report Number:
LTRC Report 536
Resource Type:
Tech Report
Geographical Coverage:
Louisiana
Corporate Publisher:
Louisiana Transportation Research Center
Abstract:
For pavement to perform well in the fi eld, a balance of both rut and crack resistance in response to the traffi c loads

and environment conditions is required. Controlling volumetric properties of a hot mix asphalt (HMA) mixture is not

enough to ensure good pavement performance because pavements often do not perform as they are designed. DOTD

specifi cations were designed to target rutting as the major distress impacting Louisiana roadways. However, an adverse

eff ect of that specifi cation was the production of “dry” mixtures. The reduced asphalt content in the mixtures resulted in

questionable durability of the roadway. A possible solution would be the development of laboratory test procedures to

evaluate the as-built pavement-qualities to predict the pavement performance and life. In so doing, numerous agencies

around the United States are incorporating mechanical tests to evaluate the rutting potential, cracking potential, and

moisture susceptibility of HMA mixtures. Recent DOTD specifi cation changes were implemented and evaluated using

semi-circular bending (SCB) and loaded wheel tracking (LWT) tests. The results of these

specifi cations were used to implement balanced mixture design practices. This study

evaluated the use of the LWT and SCB tests as end result parameters to indicate the

stability and durability of HMA mixtures. As part of this study, an attempt was made

to develop a simplifi ed and reasonable SCB test procedure so that the commonly used

Marshall Load frame device would be adapted for plant and district laboratory testing.


Format:
PDF
Funding:
SIO No. 30000220 / LTRC Project No. 11-3B
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:487e7303eca7f0a5e752d4d87a67dc3756d0e8a1534b5610b5b5cabe3a2194ef
Download URL:
https://rosap.ntl.bts.gov/view/dot/30894/dot_30894_DS1.pdf
File Type:

Supporting Files

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