Details:

Creators:
Rahman, Farhana ; Hossain, Mustaque
Rahman, Farhana ; Hossain, Mustaque Less -
Corporate Creators:
Kansas State University. Transportation Center
Subject/TRT Terms:
[+]
Aggregates Air Voids Asphalt Concrete Pavements Binder Content Mix Design Moisture Damage Pavement Cracking Pavement Performance Rutting Superpave Thermal Stresses Waste Products
Publication/ Report Number:
KS-14-1
Resource Type:
Tech Report
Geographical Coverage:
Kansas
Corporate Publisher:
Kansas. Dept. of Transportation. Bureau of Materials & Research
Abstract:
The Hamburg Wheel Tracking Device (HWTD) test (TEX-242-F) and the Kansas Test Method KT-56 (KT-56), or

modified Lottman test, have been used in Kansas for the last 10 years or so to predict rutting and moisture damage potential of

Superpave mixes, especially mixes containing Reclaimed Asphalt Pavement (RAP). Thermal Stress Restrained Specimen Test

(TSRST) was performed on selected mixes following AASHTO TP 10. All specimens tested were prepared with the Superpave

gyratory compacter.

Results showed that the number of wheel passes and rut depth from the HWTD test are significantly different for

Superpave mixes with various RAP content. Recycled Superpave mixtures with crushed gravel aggregates and sand significantly

improve overall rutting performance compared to crushed stone or crushed stone and gravel combinations in the mix. Aggregate

type also influences rutting performance of virgin Superpave mixtures. Rutting performance of Superpave mixes with or without

RAP is significantly affected by the binder source.

Statistical analysis proved that the total number of wheel passes, creep slope, and stripping slope of Superpave mixes with

RAP in HWTD tests are significantly affected by RAP content, binder grade, and asphalt sources at 90% confidence interval. RAP

percentage in the mix, aggregate type, and interaction between RAP content and aggregate type also affect the pure stripping

failure phase (stripping slope) and total wheel passes at the stripping inflection point. Analysis of variance (ANOVA) on Superpave

mixtures with RAP showed the number of wheel passes at stripping inflection point and stripping slope are significantly affected

by mix type and binder source. Rutting performance is highly influenced by voids in mineral aggregate (VMA) and RAP asphalt

content. Superpave mixtures with higher RAP content also tend to fracture at higher temperatures in the Thermal Stress Restrained

Specimen Test, indicating that these mixtures are more vulnerable to low-temperature cracking. Thus, low-temperature cracking

potential of high RAP mixture must be evaluated during the mixture design process.


Format:
PDF
Funding:
C1886
Collection(s):
US Transportation Collection University Transportation Centers
Main Document Checksum:
[+]
urn:sha256:ede0c9fef45e17418cac61a70f211827e71281462c6c301874b28d6ee0ed5c44
Download URL:
https://rosap.ntl.bts.gov/view/dot/27034/dot_27034_DS1.pdf
File Type:

Supporting Files

• No Additional Files

More +