The specific requirements are as follows: WHEN TO USE PROTOCOL P51A Generally, Protocol P51A shall only be used on subgrade soils with estimated classifications of A-1, A-2 or A-3 by the AASHTO classification system and which meet certain specified conditions with respect to coatings on the coarse aggregate and clay lumps contained in the sample. The general definition of "clean" for Protocol P51A is outlined below. The purpose of LTPP P51A is to allow, at the Laboratory Manager's discretion, a dry sieving (in place of a wet and dry sieving-i.e., Protocol P51) procedure to be conducted on very "clean" subgrade soils. All other sections of this protocol shall be followed as herein written. Those sections of the AASHTO standard included in this protocol by reference and without modifications shall be strictly followed. The tests shall be carried out in accordance with AASHTO T27-88I), as modified herein. This protocol is based on test standard AASHTO T27-88I (Sieve Analysis of Fine and Coarse Aggregates) and is designated as LTPP Test SS01 for subgrade soils. This LTPP protocol covers the determination of the gradation of subgrade soils by dry sieve analysis. Long Term Pavement Performance Project Laboratory Materials Testing and Handling Guide Protocol P51A Test Method for Dry Sieve Analysisof Subgrade Soils (SS01)
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