Mike Pleše , PE

AUI, Inc.

PERVIOUS CONCRETE IN

NEW MEXICO

AUI awarded NMDOT NM-47

Reconstruction

Project Utilizes pervious concrete in

roadway section for drainage system

PROJECT REVIEW

COLLABORATIVE

SPECIFICATION

AMENDMENTS

Revised Mix Design Compressive

Strength from 3,800 psi to 2,400 psi

Add Durability Test (ASTM C1747); 35%

to 45% loss.

Voids 18% to 30% - Unchanged

W/C Ratio 0.26 to 0.34 – Unchanged

Minimum Fly Ash 15% - Unchanged

MIX DESIGN AMENDMENTS

Density and Void Content of Freshly Mixed Pervious Concrete (ASTM C1688); +/- 5 lbs. per cubic foot of Design Target; One per Truck

Density and Void Content of Hardened Pervious Concrete (ASTM C1754); One per Day

Infiltration Rate of In-Place Pervious Concrete (ASTM C1701); One per Day

CONTRACTOR QUALITY CONTROL

Compressive Strength Revised from 3,000 psi to Information Only; No Published ASTM or AASHTO Test Method

Density and Void Content of Freshly Mixed Pervious Concrete (ASTM C1688); +/- 5 lbs. per cubic foot of Design Target; One per Truck

Density and Void Content of Hardened Pervious Concrete (ASTM C1754); +/- 5% of Target Value Established by Accepted Test Panel

Infiltration Rate of In-Place Pervious Concrete (ASTM C1701); 100 inches per hour minimum

ACCEPTENCE TESTS

LABORATORY TRIALS

Water/Cementitious Ratio

0.26 0.29 0.34

Specification Limits

Portland Cement 539 lbs. 468 lbs. 384 lbs. Fly Ash 95 lbs. 84 lbs. 68 lbs. Water 165 lbs. 160 lbs. 153 lbs. Course Aggregate 3/8” 2480 lbs. 2500 lbs. 2480 lbs. Unit Weight (ASTM C1688)

124.3 lbs./c.f. 118.1 lbs./c.f. 116.7 lbs./c.f.

Durability (ASTM C1747)

35% to 45% 32.6% loss 41.6% loss 47.8 % loss

Plastic Void Content (ASTM C1688)

18% to 30% 16.9 % 22.4 % 23.3 %

28 day Compressive Strength

2,400 psi min. 2,960 psi 2,460 psi 1,850 psi

Metallic Sheen yes yes yes

Outside Specification Parameters

Seven Test Panels

Mix Setting before placement was complete

Loss of Metallic Sheen

Addition of Hydration Stabilizer – 5X standard dosage

FIELD TRIALS

Deficient Consolidation at Bottom of

Placement

Addition of Vibratory Plate Compactor

FIELD TRIALS

Rough grade ½” high

Flat Plate Compactor

Weighted Roller Screed to Finish Grade

Pan Float to set aggregate

Cure with plastic cover

INSTALLATION PROCESS

Fresh Mix Density (supplier consistency)

ASTM C1688

Proctor Hammer

Acceptable Results + 5 lbs/ft3 of mix design

PERVIOUS CONCRETE TESTS

Hardened Density

(contractor

consistency)

ASTM C1754

Two (2) drying methods:

pick one (1) and stay

with it

Acceptable Result + 5%

of Test Section Density

PERVIOUS CONCRETE TESTS

112.93 lbs./c.f. 106.78 lbs./c.f.

TEST DISCREPANCY

Infiltration Test

ASTM C1701

As defined by contract requirements

PERVIOUS CONCRETE TESTS

Specialized Cleaning Equipment

Determine Frequency

No De-icing Agents

DON’T FORGET MAINTENANCE

Industry is continually refining Pervious Concrete

Attend Conferences

National Ready Mix Concrete Association

American Concrete Institute

National Pervious Concrete Pavement Association

Pervious Roast

Reach out to Industry Experts

EVOLUTION OF PERVIOUS CONCRETE

Michael Pleše, PE

mikep@auiinc.net

QUESTIONS