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2017 San Antonio

Capital Improvements Design

& Construction Seminar

January 27, 2017

Presented By: Dean Bayer, P.E. Ruben Guerrero, P.E.

Pavement Committee

Why a

Committee?

TCI proposed change to UDC to eliminate

classification of Residential A w/o Bus

Traffic.

Changes ESAL’s from 100,000 to

1,000,000

Adds 1.5 in. of asphalt or 4 in. of base

for typical road

Real Estate Community wanted further

evaluation of the proposal

Formed a committee to evaluate the

problem and propose solutions.

The BIG Picture

Unified Development Code

Design Guidance Manual

Standard Specifications for

Construction

Standard Details

Construction and Inspection Manual

Must be Consistent, Working Towards

One Goal:

Long-Term Performance!

BEFORE WE INVEST MORE $$$ WE NEED TO EVALUATE OUR PROCESS

Committee

Members

Technical Background

Capital and Development Projects

Design and Construction Experience

Private and Government Process

Areawide Representation

Decision Makers

Committee

Members

Razi Hosseini, P.E., COSA TCI | Co-Chair

Chris Schultz, P.E., Raba Kistner |Co-Chair

Cara Tackett, P.E., Pape Dawson

Frank Jaster, P.E., CEC

Tom Wesling, P.E., HDR

Chuck Gregory, P.E., Terracon

Bob Brach, P.E., Bexar County

Subcommittee Additions

Clint Henson, Jordan Foster Infrastructure

Arnold Briones, P.E. Yantis Company

Ruben Guerrero, P.E., CEC

Luis Maltos, P.E., COSA TCI

Anthony Chukwudole, P.E., COSA TCI

Dean Bayer, P.E., COSA TCI

Al Siam Ferdous, P.E., COSA TCI

Pablo G. Martinez, P.E., COSA DSD

Juan Ramirez , P.E., COSA DSD

Previous Efforts

1993 COSA adopted new pavement design procedures for residential streets

2007 COSA modified process due to premature failures

Modified typical details and specifications

Developed design guidance manual

Developed construction inspection manual.

Only applied to COSA Projects

2016 Pavement Committee

Starting with lightly loaded, residential pavements

Expanding to CIP programs

Evaluating four areas

Typical Details and Specifications

Design Procedures

Construction

Maintenance

Pavement Distress Throughout the Area

100

80

60

40

20

10 20 30

Expected performance WITH

entire process executed as

designed

Expected performance WITH

timely maintenance

Crack Seal

Slurry Seal

Overlay

Very Good

Good

Fair

Poor

Failed

PAVEMENT AGE (years)

PAVEMENT

QUALITY

40

Expected

Actual

What Causes

PAVEMENT

DISTRESS?

Overloading due to Heavy Trucks and

Buses

Age

Utility Cuts

Poor Drainage

Soil Conditions (clay)

Extreme Temperatures

Adverse Weather Conditions

PAVEMENT

DISTRESS

by Design

Not Following Pavement Design

Guidelines

Use of High Performance Pavement

Swelling Soils

Inconsistent Material Testing

Disregarding Standard Specifications

for Construction

Ineffective Maintenance Program

Circle of Life

Recommendations

Short term:

Evaluate/Update Guidelines

Analyze Specifications

Develop Full-Depth Moisture Barrier

Develop a Centralized Division

Efficient and Cost Effective Maintenance

Long term:

Revise the UDC and DGM toward Consistency

Create Uniform Design and Construction Standards

Moisture Control of Subgrade

*ACPA

Specification Revisions & Process Guidelines

Maintenance

Strategies

PCI

Ranges

Condition

Categories

Maintenance

Strategy

Maintenance Treatments

86-100 Excellent Routine Repair Joint And Crack Seal

71-85 Good Surface Seal Slurry Seal

Micro Surface

Chip Seal

40-70 Fair Base Repair and

Riding Surface

Replacement

Mill and Asphalt Overlay

Asphalt Recycling and

Overlay

0-39 Poor Reconstruction Full-Depth Reclamation

Remove and Replace

Steps to

Consistency

Future let projects will reflect within the asphalt bid line item

the specific type, binder, and aggregate quality.

Item 205 : HMA TY-D (SAC-A) PG76-22

Surface mixes on arterial and collector streets will meet the

Item 205 PG expectation.

Aggregate SAC-A will be required on all arterial and

collector streets for structural and skid resistant

improvements.

RAP use will be evaluated and approved by the engineer.

RAS will not be allowed on the surface mat.

References

COSA Design Guidance Manual

Area Standard Specifications for Construction

COSA Construction Inspection Manual

TXDOT Design Standards

UTSA Pavement Design Report

Capital Area Pavement Engineers Council (CAPEC)

Initiative

AASHTO Pavement Design

Area Maintenance Program

Thank You

Dean Bayer, P.E. Then & Now

2017 San Antonio

Capital Improvements Design

& Construction Seminar

January 27, 2017

Presented By: Dean Bayer, P.E. Ruben Guerrero, P.E.

Pavement Committee