Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
An Experiment Comparing the Performance of Roadstones Used as Chippings in Rolled Asphalt. A 5111 Derby Ring Road (1953-65)
A full-scale experiment at Harvey Road, Derby, (A 5111) has provided evidence about the performance of several types of roadstones when used as 3/4 in coated chippings at a nominal 100 sq.yd/ton in rolled asphalt. Despite considerable variation in the coverage and degree of embedment of the chippings actually obtained, the experiment has shown that the polished-stone value is the most important property of the aggregate affecting the sideway force coefficient of the surfacing. A minimum polished-stone value (1965) of the order of 45 was needed to ensure maintenance of a mean summer sideway force coefficient of 0.40, the recommended value for this Category C SITE. The traffic was 25,000 ton/day without well-defined wheel lanes. Most of the roadstones provided an asphalt with a good depth of texture after 12 years. Although all of the sections treated with stone of low abrasion resistance gave rather small texture depths, these depths (0.016-0.018 in) were still adequate for this speed-restricted site. Stones that crushed readily in the laboratory test have cracked on the road, but this has not affected their suitability as chippings for rolled asphalt (B.S. 594 : 1961, Schedule 2) in the conditions of the experiment. (Author)
An Experiment Comparing the Performance of Roadstones Used as Chippings in Rolled Asphalt. A 5111 Derby Ring Road (1953-65)
A full-scale experiment at Harvey Road, Derby, (A 5111) has provided evidence about the performance of several types of roadstones when used as 3/4 in coated chippings at a nominal 100 sq.yd/ton in rolled asphalt. Despite considerable variation in the coverage and degree of embedment of the chippings actually obtained, the experiment has shown that the polished-stone value is the most important property of the aggregate affecting the sideway force coefficient of the surfacing. A minimum polished-stone value (1965) of the order of 45 was needed to ensure maintenance of a mean summer sideway force coefficient of 0.40, the recommended value for this Category C SITE. The traffic was 25,000 ton/day without well-defined wheel lanes. Most of the roadstones provided an asphalt with a good depth of texture after 12 years. Although all of the sections treated with stone of low abrasion resistance gave rather small texture depths, these depths (0.016-0.018 in) were still adequate for this speed-restricted site. Stones that crushed readily in the laboratory test have cracked on the road, but this has not affected their suitability as chippings for rolled asphalt (B.S. 594 : 1961, Schedule 2) in the conditions of the experiment. (Author)
An Experiment Comparing the Performance of Roadstones Used as Chippings in Rolled Asphalt. A 5111 Derby Ring Road (1953-65)
J. R. Brown (Autor:in)
1967
17 pages
Report
Keine Angabe
Englisch
Civil Engineering , Roads , Asphalt , Surfaces , Maintenance , Traffic , Performance(Engineering) , Cracks , Wear resistance , Grain size , Binders , Great Britain
Coated chippings for rolled asphalt
| TIBKAT | 1972
Influence of precoated chippings on skid resistance of hot rolled asphalt
| Engineering Index Backfile | 1965
| Engineering Index Backfile | 1967