Process and means for the protection of roadway dressings against crack initiation
US4834577A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 1986 |
| Grant date | May 30, 1989 |
| Priority date | — |
| Expiry date | Dec 29, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31815
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The protection of roadway surface dressings against the initiation and the propagation of cracks is accomplished by interposition between the base layer and the surfacing layer of a binding layer consisting of a nonwoven geotextile interface impregnated with modified bituminous binders. The textile interface is a nonwoven fabric composed of continuous synthetic filaments of flat cross-section (width-to-thickness ratio of between 10/1 and 5/1), and are resistant to the temperatures of application of bitumen or of bituminous materials, have a low void index, are resistant to aromatic and aliphatic solvents, have a low compressibility, are deformable in the plane of laying and have a surface density preferably of between 100 grams and 300 grams per square meter. The modified bitumen is preferably based on styrene/butadiene/styrene copolymer and has characteristics such as: penetration 180/220, ring and ball 74.degree. C., penetration index 1.7, and is used in a quantity of between 300 grams and 800 grams per square meter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.