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6/24/75 AC 150/5300-4B <br />e. Other chemical stabilizers such as resins, plastics, and metallic <br />salts have been used as a means of improving the stability of <br />soils. These methods are in various stages of development and more <br />work is necessary to determine their effectiveness. None of these <br />materials or processes have so far been developed to the stage that <br />they can be utilized effectively in the construction of civil air- <br />ports. <br />67. AGGREGATE -TURF. Aggregate -turf strips differ from the usual turf strip <br />in that the stability of the soil has been increased by the addition of <br />granular materials prior to establishment of the turf. The objective <br />of this type of construction is to provide a landing area that will not <br />soften appreciably during wet weather and yet will retain sufficient <br />soil to promote the growing of turf. Such a strip is designed to serve <br />airplanes having a gross weight not exceeding 12,500 pounds, although <br />under certain conditions planes considerably in excess of this weight <br />might be accommodated. <br />a. In general, the material used in the aggregate -turf combination con- <br />sists of whatever suitable supply is locally available to accomplish <br />construction as economically as possible. <br />b. The desizable thickness to be stabilized with the granular <br />materials varies with the type of soil and the drainage and <br />climatic conditions and is determined by use of Figure 12-1. For <br />instance, to handle airplanes weighing 9,000 pounds on a subgrade <br />classification of F6, the thickness should be 10 inches. <br />Chap 12 <br />Par 66 <br />Page 77 <br />