Estimating the Unrecovered Strain During a Creep Recovery Test from the Material's Volumetric-flow Rate

Author: Shenoy A.

Source: International Journal of Pavement Engineering, Volume 3, Number 1, 1 January 2002 , pp. 29-34(6)

Publisher: Taylor and Francis Ltd

Abstract:

The ineffectiveness of the Superpave specification parameter |G^*|/sin , in capturing the high temperature performance of paving asphalts, especially some polymer-modified ones, has led researchers to seek other possible parameters that may relate to rutting resistance better. Some researchers suggested a repeated creep and recovery test as a means to obtain a new rutting parameter, while other researchers suggested a refinement to the existing Superpave specification parameter. A new parameter defined as |G^*|/(1-(1/tan sin )) was previously derived from basic principles and proposed as a refined Superpave specification parameter for future use. This new parameter was shown to essentially give the same information as that obtained through a repeated creep and recovery test.

The present work demonstrates a simpler method to obtain the unrecovered strain during a repeated creep and recovery test and uses the material's volumetric-flow rate (MVR) to get this information. While the repeated creep and recovery test as well as the |G^*|/(1-(1/tan sin )) parameter are obtained from the Dynamic Shear Rheometer, the MVR is obtained from a simple Flow Measurement Device (FMD). The FMD is a relatively inexpensive portable piece of equipment with low operational costs, and, through minimal training, the MVR data can be generated with a low level of variability. Thus, the proposed method of estimating the unrecovered strain during a repeated creep and recovery test from the MVR is greatly advantageous.

Keywords: Superpave; Repeated creep; Creep recovery; Rutting resistance; Asphalt rheology; Volumetric-flow rate

Document Type: Research article

Publication date: 2002-01-01

More about this publication?

• Editorial Board
• Information for Authors
• Subscribe to this Title
• ingentaconnect is not responsible for the content or availability of external websites

Related content

• In this: publication
• By this: publisher
• In this Subject: Construction
• By this author: Shenoy A.

Website © Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article.

• Terms and conditions
• Privacy policy
• Information for advertisers