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AASHTO Soil Classification System - Revision history
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<p><b>New page</b></p><div>{{Short description|Classification of soils for road-construction purposes}}<br />
The '''AASHTO Soil Classification System''' was developed by the [[American Association of State Highway and Transportation Officials]], and is used as a guide for the [[soil classification|classification of soils]] and soil-aggregate mixtures for [[highway construction]] purposes. The classification system was first developed by Hogentogler and [[Karl von Terzaghi|Terzaghi]] in 1929,<ref>{{cite journal |last=Hogentogler |first=C.A. |author2=Terzaghi, K. |title=Interrelationship of load, road and subgrade |journal=Public Roads |date=May 1929 |pages=37–64}}</ref> but has been revised several times since.<br />
<br />
{| class="wikitable"<br />
|+ AASHTO Soil Classification System (from AASHTO M 145 or ASTM D3282) <!-- if required --><br />
|-<br />
! General Classification<br />
! colspan="7" | Granular Materials (35% or less passing the 0.075&nbsp;mm (No. 200) sieve)<br />
! colspan="4" | [[Silt]]-[[Clay]] Materials (>35% passing the 0.075&nbsp;mm (No. 200) sieve)<br />
|-<br />
| rowspan="2" | Group Classification<br />
| colspan="2" | A-1<br />
| rowspan="2" | A-3<br />
| colspan="4" | A-2<br />
| rowspan="2" | A-4<br />
| rowspan="2" | A-5<br />
| rowspan="2" | A-6<br />
| A-7<br />
|-<br />
| A-1-a<br />
| A-1-b<br />
| A-2-4<br />
| A-2-5<br />
| A-2-6<br />
| A-2-7<br />
| A-7-5 A-7-6<br />
|-<br />
| [[Sieve Analysis]], % passing<br />
| colspan="11" |<br />
|-<br />
| 2.00&nbsp;mm (No. 10)<br />
| 50 max<br />
| ...<br />
| ...<br />
| ...<br />
| ...<br />
| ...<br />
| ...<br />
| ...<br />
| ...<br />
| ...<br />
| ...<br />
|-<br />
| 0.4255&nbsp;mm (No. 40)<br />
| 30 max<br />
| 50 max<br />
| 51 min<br />
| ...<br />
| ...<br />
| ...<br />
| ...<br />
| ...<br />
| ...<br />
| ...<br />
| ...<br />
|-<br />
| 0.0755&nbsp;mm (No. 200)<br />
| 15 max<br />
| 25 max<br />
| 10 max<br />
| 35 max<br />
| 35 max<br />
| 35 max<br />
| 35 max<br />
| 36 min<br />
| 36 min<br />
| 36 min<br />
| 36 min<br />
|-<br />
| Characteristics of fraction passing 0.425&nbsp;mm (No. 40)<br />
| colspan="11" |<br />
|-<br />
| [[Liquid Limit]]<br />
| colspan="2" | ...<br />
| ...<br />
| 40 max<br />
| 41 min<br />
| 40 max<br />
| 41 min<br />
| 40 max<br />
| 41 min<br />
| 40 max<br />
| 41 min<br />
|-<br />
| [[Plasticity index]]<br />
| colspan="2" | 6 max<br />
| N.P.<br />
| 10 max<br />
| 10 max<br />
| 11 min<br />
| 11 min<br />
| 10 max<br />
| 10 max<br />
| 11 min<br />
| 11 min<sup id="fn_1_back">[[#fn 1|1]]</sup><br />
|-<br />
| Usual types of significant constituent materials<br />
| colspan="2" | stone fragments, gravel and sand<br />
| fine sand<br />
| colspan="4" | silty or clayey gravel and sand<br />
| colspan="2" | silty soils<br />
| colspan="2" | clayey soils<br />
|-<br />
| General rating as a subgrade<br />
| colspan="7" | excellent to good<br />
| colspan="4" | fair to poor<br />
|}<br />
<br />
Plasticity index of A-7-5 subgroup is equal to or less than the LL - 30. Plasticity index of A-7-6 subgroup is greater than LL - 30.<br />
<br />
== References ==<br />
{{reflist}}<br />
<br />
== See also ==<br />
* [[Unified Soil Classification System]]<br />
<br />
{{Soil type}}<br />
{{DEFAULTSORT:Aashto Soil Classification System}}<br />
[[Category:Soil classification]]</div>
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