![]() This all leads to confusion or conflict in the application of the specification. I detest when I see specifications called for "common fill" or "earth fill" or "free-draining common fill". " - better yet, all specifications should clearly state materials with the appropriate gradation ranges that would be considered acceptable. As for the OP, for specifications where "gravel" is to be used, I would opine something like: "well graded natural or manufactured material in the gravel size. In a vernacular sense, what Zambo says is correct - but for specifications, one should be very careful. Gravel is a SIZE of particle - this is what all classifications follow. I do not agree that gravel is a naturally occurring material. Gravel cvg (Civil/Environmental) 1 Oct 10 15:21 If the aggregate "base" would be used as a subbase, the range of particle sizes would be somewhat different and not as strict. Each state or Province have their own - in Ontario, an aggregate base would be called MTC Granular A for example. it may also have requisite properties like PI < 6, maximum particle size of 37.5 mm, LA Abrasion less than 25, etc. If there is sand, silt, etc., then - according to sticklers of ASTM, it would be given specific names that you could look up in ASTM specification for classifying soils according to my old system (Burmeister, I think) we would say sandy gravel (for 20-35% sand and the rest gravel) or sandy gravel, trace silt (similar but with <10% silt).Īn aggregate base would be a particle size grading range that is desired consisting of sand and gravel, mainly with a trace of silt - meeting a particular specification. ![]() If a material was "pure" gravel - then only these sizes would be present. We deliver aggregates to the following towns and their surrounding areas including Bedale, Boroughbridge, Catterick, Easingwold, Harrogate, Helmsley, Knaresborough, Leeming, Leyburn, Malton, Masham, Northallerton, Pickering, Richmond, Ripon, Scarborough, Tadcaster, Thirsk, Wetherby and York.To me, gravel is a particular "grain size range" - 75mm to 4.35 mm (#4 sieve) Unified Soil Clasification. Crusher Runs often have a much higher percentage of the smaller particle sizes (higher fines content).Ĭrusher Run is normally used as a sub-base for domestic applications, as when compacted it makes an extremely solid and level base for patios, garden buildings and flooring. Where the crusher run is produced in a quarry that also produces a fully graded Clause 803 Type 1 it is likely the frost susceptibility will be compliant with highway standards, however, the particle size will be very different. There is no specification for crusher run and therefore it differs from Type 1 in both particle size and frost susceptibility. ![]() It is important to note that there is no specification for DOT Type 1 so whilst it may comply with the Clause 803 grading for particle size, it is likely it will not comply with the frost susceptibility rating and therefore would not be suitable for major infrastructure works.Ĭrusher Run, on the other hand, can be graded to various sizes but most commonly is offered in 75mm – dust or 40mm – dust. Where some quarries cannot comply with the MOT Type 1 specification, they offer a product called DOT Type 1. The frost susceptibility rating is often why some softer limestones are unable to meet the specification. Type 1 stone is made to ‘Clause 803: The Specification for Highway Works’ and is graded to comply with certain particle sizes and a frost susceptibility rating. ![]() Type 1 material is graded from 40mm down to dust and is used for a regulating course under highways, sometimes referred to as sub-base. Despite how these two products look when in a stockpile they are, in fact, very different. ![]()
0 Comments
Leave a Reply. |