The Design of Plant Mix Bituminous Base (PMBB) Course

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来源：epg.modot.org 发布日期：2007-3-20

Use of PMBB courses should be limited to bituminous bases beneath Plant Mix Bituminous Pavement (PMBP) surface mixtures on full depth light duty pavements, as base widening on routes designated as light duty corridors, or on any bypasses or temporary roadways, regardless of the corridor designation. A SP250 mixture may be used in lieu of a PMBB mixture when ADT is less than or equal to 3500. Such a substitution should be limited and requires approval by the District Operations Engineer. A PMBB mixture cannot be placed in lifts of less than 3 in. (75 mm). Mineral aggregate-gradation requirements are set forth in the standard specifications. An approved commercial mixture may be used in lieu of PMBB mixtures for minor roads with low traffic in accordance with guidance in Thickness Determination for work that is considered temporary construction, primarily defined as work that is to be removed prior to completion of the contract, pavement that will become non-mainline pavement, or pavement that will not remain in MoDOT inventory. The Construction and Materials Division Pavment Team should be contacted to determine whether commercial mixture would be an appropriate substitution. After concurrence from Pavement Team, the designer should note on the 2B sheets in the “Remarks” section where a commercial mixture may be substituted for a PMBB mixture and on the typical section.