WELCOME! Joseph Ortega, Chapter President Precision Concrete - - PowerPoint PPT Presentation

WELCOME!

Joseph Ortega, Chapter President Precision Concrete Cutting Introductions

2020 Chapter Supporters

Gold Level

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January Luncheon Chapter Supporters

Harris & Associates

45 Years of Serving the Public

Since 1974, Harris & Associates has improved communities and created better places to live through smart, safe, and sustainable public works services.

Harris & Associates’ Services

Providing Value to Public Works Teams

100 % Employee-Owned

Accountable and Invested Across the Board

 Harris & Associates is a 100% Employee Stock Ownership Plan (ESOP)

• firm. Everyone at Harris has skin in the game.

 Clients always deal directly with the firm’s principals. Everyone at Harris is accountable for the success of your projects!  This ESOP structure laid the foundation for a financially-sound future so we aggressively invest in all employee owners’ professional development.

Why Harris?

People Values Cultur e Vision Expertis e

Learn more about how we partner with

• ur communities!

www.WeAreHarris.com

OUR BUSINESS

FOUR OFFICES SERVING N. CA CLIENTS

Santa Rosa Pleasant Hill Fairfield Auburn

AREAS OF SERVICE

Engineering CM & Inspection Building Dept. Services

APWA NORCAL CHAPTER CLIENTS

CITIES/TOWNS SPECIAL DISTRICTS

Alameda El Cerrito Rohnert Park Bodega Bay PUD * Albany Emeryville * Ross Callayomi Water District * American Canyon * Fairfax San Anselmo Konocti Water District Antioch Fairfield * San Rafael Hidden Valley Lake CSD * Benicia Healdsburg * Santa Rosa * Presidio Trust of S.F. Berkeley Mill Valley

• St. Helena

Ross Valley Sanitary District Calistoga * Napa Suisun * Sonoma County Water Agency * Clearlake * Novato * Tiburon Sweetwater Springs Water District * Cloverdale * Piedmont * Ukiah Corte Madera Pinole Vacaville *

COUNTIES

Cotati Windsor * Marin Solano Napa Sonoma

* - Denotes Agencies where our current staff has served as City/District Engineer.

THE COASTLAND DIFFERENCE

MUNICIPAL EXPERIENCE

• Sole Focus is Municipal Clients.
• Our City or District Engineer/Director Experience.
• Over 160 combined years’ experience at 26 different agencies.

OUTSTANDING EMPLOYEES

• Client Testimonials
• “Coastland’s design and construction teams take the time to understand and

appreciate project goals and provide invaluable guidance. They are a tremendous resource to the City……..”

▪ Tetyana (Tanya) Mokvyts, PE, Senior Engineer, City of Santa Rosa.

• “Their staff constantly foresee issues before they happen……... Their in-the-

trenches understanding – literally – of how to build projects and partner with contractors has been a benefit to our community.”

▪ Hunter Young, PE, Senior Civil Engineer, City of San Rafael.

• “Coastland’s people are of solid integrity, easy to work with, and excellent

ambassadors in representing our interests.”

▪ Chester Nakahara, Public Works Director, City of Piedmont.

CLIENT FOCUSED

• Client Satisfaction is Our Primary Goal.
• We are experienced, engaged and proactive.
• We employ a true partnering approach.
• We are professional and put our clients in a positive light.
• The Results:
• Coastland has a 92% Repeat Business Rate!!!

Featured Agency

13

Featured Agency January 23, 2020

Mission

The Public Works employees deliver cost effective, safe, reliable and sustainable projects, programs and quality services with a focus on our communities and provide support services that are competitive, attentive, responsive, efficient, and safe to enable County Departments to provide high quality services to the public.

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Vision

• Well trained quality

staff that uses a collaborative approach

• A leader in service

delivery through teamwork in cooperation with our communities

• Flexible and creative in finding solutions
• A culture of great customer service
• Work with a common vision of success within our Department and our communities
• Steward of the environment for future generations
• Employer of choice that promotes professional development and work life balance
• Explore and apply cost effective technology
• Celebrate staff and successes
• Promote strategic thinking and implementation
• Provide quality products and services
• A safe environment for employees and the public we serve

15

Values

We believe in: OUR PEOPLE We have mutual respect for each

• ther and are a well trained

workforce. OPEN COMMUNICATION We practice active listening and encourage diverse points of view. CUSTOMER SERVICE We are creative and flexible in providing cost effective and timely service delivery. ENVIRONMENTAL STEWARDSHIP We balance environmental sustainability, cost and delivery to provide products and services. TEAMWORK AND COLLABORATION We work together and share a common vision. PARTNERSHIPS We work with outside entities to achieve improved projects, programs, and services. ACCOUNTABILITY We provide cost effective solutions and on-time project delivery. SAFETY We share the responsibility to protect the lives, health and property of our coworkers and the public.

16

17

Contra Costa County Public Works Department

• 550 Staff – approx. 17-18% vacancy rate in current year
• 19 Divisions
• Includes: Two Airports (Buchanan and Byron) and many of

the General Services operations

• 660 miles of roads – current PCI is about 71
• 79 miles of Flood Control channels/29 Detention Basins
• 200+ County Buildings
• CPM currently working on 83 projects valued at $300M+
• $255 Million Dollar Budget for 2019/2020
• Approx. $39 Million in gas tax, including SB1
• Approx. $125 Million is General Fund (GF) expenditures
• Our Dept. GF costs are approx. $27 Million
• Budget for 2020/2021 looks very similar as previous year

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Contra Costa County Public Works Department

• First County in California to become APWA Accredited in

2001

• Culture of Innovation and Creativity
• Provide our staff with opportunities while maintaining a

strong work/life balance

• Tradition of involvement in Nor Cal APWA, as well as other

professional organizations and partners

• Currently working with our Department on four focus

areas:

• Recruitment/Retention
• Succession Planning
• Training
• Communication

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Contra Costa County Public Works Department

• Given our current vacancy rate, we are almost constantly

recruiting for various positions, please visit our HR website at : https://www.governmentjobs.com/careers/contracosta

• Design/Construction will be soliciting for CM work about

the middle of this year

• Cap Projects will be soliciting for CM work for some fire

stations and eventual demo of our admin bldg.

• Strong history of working with our private sector partners

to solve the issues facing our County and serving the residents of Contra Costa County

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Thank you!

21

• February 4th – 2020 Public Works Conference Planning

Meeting

• February 20th – 2020 Project Awards Luncheon
• March 16th-18th – Public Works Institute Module 4

• Fill out the survey for a chance to win a

Starbucks gift card!

• APWA Gold Name Badges – Purchase for $10

Get involved and help to make our Chapter even better!

Our Failing Pavements – Performance Based Design & Rehabilitation

Presented by: James Signore, PE, PhD NCE

Our Failing Pavements –

A Back to Basics Look at the Design-Performance Relationship

APWA Northern California Chapter Monthly Educational Luncheon

Pleasant Hill, CA January 23, 2020 James Signore, PE, PhD

Ov Overview view

• Pavement Performance
• Pavement Design Principles
• Major Asphalt Concrete (AC) Distresses – Causes and

Design Issues

– Alligator Cracking – Block Cracking – Rutting – Transverse Cracking – Weathering and Raveling

Pave Pavement ent Pe Perfor

• rman

mance ce

Why hy Pave Pavement ment De Deterior teriorates ates

• Environmental

– Sun – Heat/cold – Water – Time

• Traffic Loads
• Trucks

– Freight – Construction – Garbage/Recycling

• Buses
• Airplanes
• Cars

Time Condition

How w Pave Pavement ment De Deterior teriorates ates

Pave Pavement ent De Desi sign gn Pr Prin incipl ciples es

Pavement Pavement De Desi sign gn

• Empirical –

– Design based on observations of performance – ‘This has worked in the past, let’s do the same thing again…’

• Mechanistic

– Design based on combination of fundamental principles of materials and traffic loading and climate

• Mechanistic-Empirical

– Design utilizing Mechanistic principles in conjunction with field evaluated performance

AASH ASHO O Roa Road d Test t - Em Empi pirical rical

Ca Cali lifornia

• rnia Test

st Tracks acks –

Bri righto hton n (1 (194 940) 0) an and S d Stockto kton n (1 (1950 950)

Pavement Pavement De Desi sign gn

• Structural Design

– Material type selection – Layer thickness(s) determination

• Mix/Material Design

– Support structural design

Wheel Load Hot Mix Asphalt Base Subbase Subgrade – Native soil

What’s Happening Within a Pavement

Flexible Pavements

Pavement Pavement Fai ailures lures (D (Dis istresses) tresses)

Descripti criptions ns, , Cau auses, es, & D & Design ign

• Al

Alli ligator gator Crac acking king

• Bloc
• ck

k Crac acking king

• Ru

Rutting ing

• Transver

ansverse se Crac ackin king

• Weathering

athering an and d Rav Raveling eling

Al Alli ligat gator

• r Crackin

cking g (F (Fati tigue gue Cracki cking) ng)

Why hy Fat atigue? igue?

Wheel load

All lligator igator / F Fat atigue igue Me Mechanism chanism

Propaga

• pagation

tion of f Fatigue igue Crack acking ing

Distress is worse towards the bottom

• f the pavement section

Al Alli ligat gator

• r Crackin

cking

How w Do Do We De Desi sign gn Agains ainst t Fat atigue? igue?

• Trucks and buses cause pavements to bend

=> Design to tolerate bending

• Want AC thick enough and pavement section stiff

enough so that:

– Bending is small for the expected traffic – Cracks do not go through AC with expected traffic

• Specifications and inspection for compaction are

vital

Bl Bloc

• ck

k Crack cking ing

Bl Bloc

• ck

k Crack cking ing

• Pavement cracks into interconnected, roughly

rectangular shaped pieces

• Attributed to daily temperature cycling and HMA mix

that is not ductile enough over time

• Aging and oxidation of the asphalt
• Brittle failure

Bl Bloc

• ck

k Crack cking ing

10

Source of Asphalt

Bl Bloc

• ck

k Crack cking ing

Asph phal alt t Compos position ition – Why hy Aging? ng?

Asphaltenes Maltenes Rostler

(Acid Separation)

paraffins second acidaffins first acidaffins nitrogen bases Represent 5% to 25% of the asphalt

• Insoluble
• Black
• Hard
• Glassy

Represent remainder of the asphalt

• Soft
• Flowable

Aging: Maltenes Asphaltenes

Courtesy FHWA

X

How

• w Do

Do We De e Desi sign gn Aga gain inst t Bl Bloc

• ck

k Crack cking? ing?

• Binders age at different rates. Predicting?
• Ensure that AC mix design has sufficient binder
• Ensure that AC mix is ‘compactable’ -> Specs

– High air voids in compacted mix accelerate block cracking – Some ‘high performance’ mixes may be challenging to compact if contractors are not used to them

• Long term performance is more about climate and

maintenance

Ru Rutt tting ing

Ru Rutt tting ing

• Depressed pavement area in wheelpaths resulting

from:

– Wheel loads

• Slow or parked vehicles more damaging

– High temperatures – Poorly compacted and/or unstable AC mix – Soft/poorly compacted AB or native

Soil Subbase Base HMA Surface Wheel load

Ru Rutt tting ing (P (Perma rmanent nent Deformati

• rmation)

n)

Courtesy FHWA

Mod

• der

erate te to Seve

• Severe

re Ru Rutt ttin ing g

In Pave n Paveme ment nt Se Sectio tion

Mod

• der

erate te to Seve

• Severe

re Ru Rutt ttin ing

Conf nfin ined ed to HMA MA Layer ayer/Wh Wheel eelpath paths

Ru Rutt tting ing from m Fai aile led U d Uti tili lity ty Pat Patch

How w Do Do We De Desi sign gn Agains ainst t Ru Rutti tting? ng?

• Sufficient AC (and AB) thickness to reduce pressure
• n native ground
• Material selection:

– Modified binders or stiffer binder – Higher crush count aggregates for more stable mix – though density still crucial

• Proper compaction to minimize excess ‘traffic

compaction’ (specifications)

Transver sverse se (Th (Ther ermal mal) ) Crackin cking

The hermal rmal Cr Cracking acking

• As temperature fluctuates over course of a day or year,

pavement responds

• Cold Temperatures

– Binder in HMA stiffens, length

• Hot Temperatures –

– More ‘flexible”, less stability, length

• As pavement ages, HMA becomes more brittle
• When cold enough - stress from shrinkage builds to

cracking point

Location Along HMA Surface Contraction HMA surface Friction on Underside of HMA Surface Tensile Stress in HMA Surface Existing Crack or Cold Joint Existing Crack or Cold Joint layer

The hermal rmal (T (Transver ansverse) se) Cr Cracking acking

Courtesy FHWA

Th Ther ermal mal (T (Transver sverse) se) Crackin cking wit ith h sp spalli lling ng

Th Ther ermal mal (T (Transver sverse) se) Crackin cking Reg egular lar Sp Spaci cing

Wid ide

Th Ther ermal mal (T (Transver sverse) se) Crackin cking Se Seale led

How w Do Do We De Desi sign gn Agains ainst t The hermal rmal Cr Cracking? acking?

• Use of proper PG (performance grade) binder

– For example PG 64-10

• 64 => high temp performance (Rutting)
• -10 => low temperature performance (Thermal Cracking)

– If lower number too high for climate region => may be more susceptible – Can consider lowering lower number but can lead to rutting –> Trade off

• Use of AB (friction) under AC helps to hold cracks

tighter – more cracks but tighter

Wea eatheri thering ng and Rav Ravel eling ing

Wea eatheri thering ng

• Fine portion of HMA wears away due to

embrittlement of binder

• Aging process
• “Toothy” appearance

Rav Ravel eling ing

• The Asphalt pavement becomes “loose” and starts

to break apart due to aggregate segregation

– “Pock-marked” surface

• Raveled areas become unstable if severe and can

lead to other problems

• Can be attributed to improper mix or compaction

techniques or outcome of weathering

How w Do Do We De Desi sign gn Agains ainst t Weat eathering hering an and d Rav Raveling? eling?

• Stable AC mix with proper binder content
• Ensure compactable, high density mix => Specs
• Establish a practice of regular maintenance

– Initial design cannot assume lack of attention

De Design sign Ca Case se Study Study

Co Conclusions nclusions

• Despite their simple appearance, pavements are

complex engineered structures

• Design and performance are tightly integrated

– Their interconnection must be addressed during the life of the structure.

• One size does not fit all

Than Thank k You!

• u!

James Signore, PE, PhD 510-215-3620 jsignore@ncenet.com

How

• w Pave

Pavements ents Ar Are e Mea easu sured: red: Pave Pavement ent Con

• ndition

ition Index

100 70 50 25 Poor/Failed Fair Very Good - Excellent At Risk

PCI > 90

Courtesy NCE

PCI = 75

Courtesy NCE

PCI = 60

Courtesy NCE

PCI = 40

Courtesy NCE

PCI < 20

Courtesy NCE

Surveying Pavements

How w Do Do We Select lect Treatments? eatments? Ex Exam ample ple

• First cut - use of a decision tree for project selection
• Then take each pavement on a case by case basis

Ma Mainte intenance nance for r Fat atigue igue Cr Cracking acking

• Early cracking: first defense – crack sealing
• Local failure: base repair – remove and replace

– Doesn’t offer increased bending resistance unless thicker than original

• Overlay – adds thickness and bending

resistance

– Skin Patch?

• Base repair and overlay – “Belt and

Suspenders”

• Reconstruction

Main intenan tenance ce for

• r Bl

Bloc

• ck

k Crackin cking

• Crack sealing to prevent moisture infiltration

if not too severe

• Surface seals to slow rate of aging and

further deterioration

– Early stages – fog or slurry or micro – Later stages – scrub or chip

• If very severe (and small) remove

and replace

Ma Mainte intenance nance for r Ru Rutti tting ng

• Wide and deep -> Indicates subgrade failure

– $$$$ Reconstruct section – $ Mill AC if deep enough and replace and overlay

• Decreases stress on subgrade to minimize further rutting
• Don’t overlay on top of ruts > ½ inch (mill flat first !)
• Confined to HMA

– Mill and overlay

Ma Mainte intenance nance for r The hermal rmal Cr Cracking acking

• Narrow:

– Crack seal all thermal cracked areas – Observe seals – may fail/open up due to movement

• Wide:

– Remove and replace cracked pavement section (1-4 ft. long) – Mastic (proprietary product) – Cold In-Place Recycling – if severe and frequent – Observe seals – may fail/open up due to movement

• Difficult cracks to maintain

Main intenan tenance ce for

• r Wea

eathe thering ring and Rav Ravel elin ing

• Raveling

– Severe – remove and replace, particularly if fatigue cracking – Slurry/micro/chip seal

• Weathering

– Slurry/micro/chip seal