COMPARING LABORATORY AND FIELD POLISH RATES OF COARSE AGGREGATES FOR SKID RESISTANCE PURPOSES
This report describes a method and analysis of comparing laboratory and field information concerning coarse aggregate polish rates. The laboratory polish rates resulted from the use of a British Wheel whereas field polish rates were obtained from information previously collected with a skid test unit. The analysis consisted of correlating the laboratory and field polish rates using several commercial aggregate sources in or near the State. The results indicated various levels of skid resistance depending on the aggregate source. However, the comparison of polish rates revealed a confused relationship due to the data scatter in the field polish rate. Examples of variables which probably affect the variation found are (1) the effect of seasonal changes on a pavement surface as measured by a skid test unit, (2) the effect of climatological changes on a pavement surface as measured by a skid test unit, (3) the effect of different construction techniques on the pavement surface as measured by a skid test unit, and (4) the validity of the field data for this purpose, since the indicated SN is an average value for a section of the project. Even though asphaltic concrete surfaces were considered, the field study eventually involved chip seals and surface treatments because these surfaces closely resembled the surface used in the laboratory test. Even though the relationship between the field and laboratory polish rates is inconclusive, a relationship between ultimate polish levels does exist. This relationship indicates the laboratory "Polish Value" can predict the ultimate field polish level for an aggregate source where the field polish level would represent the average condition found on a roadway in the state which uses the aggregate for a seal coat or surface treatment. /Author/
- This report was prepared in cooperation with FHWA, DOT.
Texas State Department of Highways & Public TranspP.O. Box 5051
Austin, TX USA 78763
- Elmore, W E
- Hankins, K D
- Publication Date: 1977-7
- Features: Appendices; Figures; Tables;
- Pagination: 34 p.
- TRT Terms: Alternatives analysis; Asphalt concrete; Chippings; Climate; Cluster analysis; Field studies; Laboratory studies; Pavements; Paving; Polishing (Aggregates); Seal coats; Seasons; Skid resistance; Surface course (Pavements); Surface treating; Texture
- Uncontrolled Terms: Clustering
- Old TRIS Terms: Chips; Polishing characteristics
- Subject Areas: Highways; Pavements;
- Accession Number: 00176636
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: FHWATX77216-1F Final Rpt.
- Contract Numbers: DHT-1-9/10-75-216
- Files: TRIS, STATEDOT
- Created Date: Jul 29 1978 12:00AM