Monsanto Company

University of Illinois

Astroturf Industries, Inc.

Barry J Dempsey

Joseph Mantarro

William G Buttlar

Muhammad T Mukhtar

Charles R McQuary

Alex K Apeagyei

Douglas M Senso

Keh-Chang Liu

A combination of antioxidants and method of incorporating the antioxidants into an asphalt binder to make a modified asphalt binder are described. The antioxidants comprise a thioester and an aldehyde. The aldehyde and thioester, in a ratio between about 1:100 and about 100:1 parts by weight, are added to an asphalt binder. An acidic catalyst is also added in a concentration between about 0.1 wt % and about 18 wt % of the asphalt binder. The antioxidants, asphalt binder, and catalyst are mixed at a temperature between about 85&#xb0; C. and about 135&#xb0; C. for a time between about 30 minutes and about 6 hours. The antioxidants are capable of improving the performance grade of the asphalt binder. The modified asphalt binder possesses superior resistance to oxidative age hardening compared to other modified asphalt binder compositions that incorporate various antioxidants.

Antioxidant treatment of asphalt binders

The present invention provides a stress absorbing composite for road repair that comprises a low stiffness geotextile, a viscoelastic material disposed over the low stiffness geotextile, and a high stiffness geotextile disposed over the viscoelastic material. Also provided is a method for retarding reflective cracking in an overlay using a stress absorbing composite and a repaired road containing a stress absorbing composite.

Stress absorbing composite for road repair and method

An artificial turf assembly has a permeable section formed of an upper layer of artificial turf and a lower layer of shock absorbing material positioned below the upper layer. An impermeable layer is positioned below the permeable section for collecting water flowing downward through the permeable section. The permeable section is separable from the impermeable layer to form a space for the water flow away from the assembly. The space may be formed by having the permeable section lying on the impermeable layer so that it lifts off the impermeable layer and floats on the water that flows through the permeable section. Alternatively, rigid spacing members may be provided for maintaining space between the permeable and impermeable layers in the absence of water.

Drainable artificial turf assembly

Drainage mat comprising three-dimensional openwork covered on at least a major surface with a water permeable fabric having a permittivity from 0.2 seconds.sup.-1 to 2.0 seconds.sup.-1 and exhibiting a dynamic permeability after 10.sup.6 loadings of at least 10.sup.-4 centimeters per second.

Drainage mat

Method and apparatus for inserting an elongated bendable drainage mat having a rectangular cross section below the surface of the ground in a vertical orientation in an advancing trench segment.

Method and apparatus for installing highway drainage mat

Elongated, bendable drainage mat having a rectangular transverse cross section and comprising a polymeric core having a plurality of substantially rigid fingers extending from one side of a layer and an enveloping water permeable fabric having a permittivity from 0.2 seconds.sup.-1 to 2.0 seconds.sup.-1 and a dynamic permeability after 10.sup.6 loadings of at least 10.sup.-4 centimeters per second. Apparatus and systems using such drainage mat.

Growing community of inventors

White Heath, IL, United States of America

Barry J Dempsey