Impact of addition of greasy diamide on the rheological-mechanical properties of warm-mix asphalt

•The densification through SGC reduces the compaction temperature of WMA.•Adding 1.5 and 3% of greasy diamide (additive) reduces the compaction temperature.•Additive reduces the phase angle and increase the dynamic shear rheological modulus.•Greasy diamide added up to 3% improved the viscosity and t...

Full description

Saved in:
Bibliographic Details
Published in:Construction & building materials 2019-06, Vol.211, p.308-316
Main Authors: Covarrubias, Pedro Limón, Galaviz-González, José Roberto, Cueva, David Ávalos, Aguilar, Saúl Castillo
Format: Article
Language:English
Subjects:
Analysis
Asphalt concrete
Asphalt industry
Compaction temperature
Construction industry
Deformation
Energy consumption
Environmental aspects
Greasy diamide
Mechanical properties
Properties
Warm-mix asphalt
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•The densification through SGC reduces the compaction temperature of WMA.•Adding 1.5 and 3% of greasy diamide (additive) reduces the compaction temperature.•Additive reduces the phase angle and increase the dynamic shear rheological modulus.•Greasy diamide added up to 3% improved the viscosity and the lubricity of the WMA.•The rheological and mechanical properties of WMA reach the same level as HMA. Warm-mix asphalt (WMA) containing additives is used to decrease both the costs and harmful effects to the environment by reducing the viscosity, mixing temperature and compaction energy of asphalt without affecting its mechanical and dynamic properties. The lubricity effect is important in the densification of the mixture and must be measured during compaction (using a Superpave gyratory compactor). This work analyzes the impact of the addition of greasy diamide (DG) on the rheological-mechanical properties of dense-grade mixtures manufactured with asphalt AC-20 by examining a reference sample (HMA) and three improved samples (WMAs) with different percentages (1.5, 3.0 and 4.5%) of greasy diamide. The type of aggregate, content and type of asphalt and compaction energy were found to remain constant in the test mixtures. The rheological properties were measured according to current regulations, and the deformation was determined using a uniaxial cyclic compressive tester and a Hamburg loaded wheel. The results showed that the addition of greasy diamide to WMA improved the rheological properties while decreasing the compaction temperature and maintaining densification without significantly affecting the mechanical behavior.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2019.03.149