For each project, a mix design shall be submitted for approval with the project plans and specifications. The following section provides material specifications and requirements for the pervious concrete mix. The seven day compressive strength of pervious concrete pavement mixtures shall range from 3,300 to 2,900 psi.
4.1 Cementitious Materials
Portland cements meeting the criteria of ASTM C 150 and C 1157 may be used as well as blended cements meeting the standards of ASTM C 595 and C 1157. Fly ash and pozzolans meeting the requirements of ASTM C 618 may also be used in the proposed mix. Due to problems with odors and discoloration of any runoff which may occur offsite, blast slag may not be used. Mix proportions for cementitious materials in the proposed mix shall be from 550 to 700 lbs/yd3.
4.2 Aggregate
4.2.1 Aggregate
Aggregate for the pervious concrete batch mix shall be 2000 to 2500 lbs/yd3. The aggregate to cement ratio shall be 4 to 4.5:1. The proportions of course and fine aggregates are presented in the following sections.
4.2.2 Coarse Aggregate
The content of coarse aggregate in the batch mixture shall be narrowly graded and consist of aggregate meeting the requirements of course aggregate conforming to ASTM C 33 No. 67 or No. 8.
4.2.3 Fine Aggregate
The content of fine aggregate to coarse aggregate ratio in the pervious concrete batch mixture shall be limited to range of 0 to 1:1 by mass.
4.3 Water Cement Ratio
The water to cement (w/c) ratio for the project mix shall be 0.27 to 0.30. Water used in the manufacture of the batch shall comply with Section 913.01 of the Indiana Department of Transportation's Standard Specifications, latest edition.
4.4 Admixtures
The use and purpose for admixtures, such as retarding agents, shall be clearly indicated in the mix design submitted for the project. All admixtures shall conform to ASTM C 494.