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Home / DOT Specifications / Pennsylvania / Publication 408 — Specifications / 220
Earthwork (200-299)

220FLOWABLE BACKFILL

PA · 2026 Standard SpecificationsBook pages 208–210View official source ↗

303.1 303.3(e)

303.1DESCRIPTION —This w ork is the construction of a cement treated permeable base course (CTPBC)

on a prepared surface. If placed on subgrade, this work includes the preparation of subgrade as specified in Section 210.

303.2MATERIAL —

(a)Aggregate. Coarse Aggregate, Type A or Type B Section 703.2 for AASHTO No. 67 or No. 57, except

restrict the material passing the No. 200 sieve to a maximum of 2%. Determine the loss by washing according to PTM No. 100 . Do not use fine aggregate in the mixture. The use of blast furnace slag or crushed gravel is allowed. When using crushed gravel, provide a minimum of 75% crushed particles with at least two faces resulting from fracture.

(b)Cement. Type I or Type II cement, Section 701.
(c)Water. Section 720.1 .
(d)Supplementa ry Cementitious Material . Section 724.2(b) .
(e)Mixture Design. Provide a mix design as follows:

• Submit, for review by the Representative, a mix design using 200 pounds of cement per cubic yard based on the saturated surface -dry rodded unit weight of aggregate. Fly ash may be substituted for up to 10% of the required cement, with a substitution ratio of 3.3 pound of fly ash for each 2.2 pound of cement. Design and proportion the cement and water based on the saturated surface -dry weight of the aggregate. Do not exceed a water -cement ratio of 0.40. Provide a mix with 100% coverage of aggregate without r unoff. Mix and proportion as specified in Section 704.

• Certify as specified in Section 106.03(b)

(f)Concrete Curing Material. Section 711.1(a) , 711.1(e) , and 711.2(a) Type 2
(g)Admixtures. Section 711.3

303.3CONSTRUCTION —

(a)General. The Contractor may perform half -pavement or full -pavement width construction.
(b)Weather Restrictions. Section 501.3(b) .1
(c)Concrete Mixtures. Section 501.3(c)
(d)Conditioning of Rubblized Pavement/Subbase. Thoroughly sprinkle water on the rubblized

pavement/subbase before placing CTPBC, if necessary to ensure a moist condition. Sprinkle with as much water as it readily absorbs, well in advance of CTPBC placement.

(e)Placement and Compaction . Use an approved asphalt paver or mechanical spreader, equipped with

screed, plate vibrator, and fully automated sensors to control profile and transverse grade. Use mechanical equipment for the entire lane width or as much lane width as practical. Adjust screed a ssemblies to provide the required cross section and depth. Compact the CTPBC using steel -wheel power rollers having a manufacturer’s certified metal weight from 8 tons to 10 tons. Use of vibratory paver screed as sole means of attaining compaction is not allowed. Perform a minimum of one pass with the roller to achieve compaction and do not compact material t

Source: Pennsylvania Department of Transportation Specifications, 2026 Edition. Pages 208–210 of 1,522.
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