asphalt pavment maintenance filed book

8/20/2019 Asphalt Pavment Maintenance Filed Book

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Asphalt

Pavement M

Field Handbo

RJBUSHED

BY


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LlNMWC

S r o l r l s o l l s

Minnesota Locd

Road

Research

Board

(LRRB)

Rcscwch ImplementationCommittee

Minnesota Depaitment of Transportation

(MnlDoT)

Federal

Highway

Administration (FHWA)

Circut Training and Assistance Program CTM3,

Minnesota Tz/LOUl Technical Assistance

pmOnm (LTAP),

Center for Tnnrportilition S t u d i i CTS),

University of Minnesota

TECHNKAL ADVISORY

PANEL

The Technical Advisory Panel that steered this

proiect was extremely helpful

in

identifying

key

issues and concerns ofthose responsible for

m*ntoinii our asphalt

pavements.

They also

were very

generous with

their

time

to

review

th

merit

and

contribute

to

ts technical

accura

and applicption

to

Minnesota. We appreciate th

as&ance of

the

following p e q k who saved o

the Technical Advisory Panel for this document:

hlaria

Hagen Minnesota T~ILTAP Program

JemyGeib Mn/DOT

~ O l s o nMnlDOT

Gene Skok Department of C i l Engineering

Univenityof Minnesota

Tom

Wood

MnlDOT


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INTRODUCIION

H W

o

USE THIS MANUAL

This

field manual

provides

guidelines for preventiveasphalt pavement main

nance techniques

for a variety of

distmxr

and

d i m .It

COWK:

crack

treatments (dean and real,

rout

and seal,

full-depm

crack

repaid

*

surface tnstments

fog seal,

seal

mat, thin hot-mix owdays

pomok patching

and

mpair ~cdd-miiasphalt,spray in ist ion patching,

hot-

mix asphalt, duny or microsurfacingmatecial)

REUTEDW B U

This

field

manua

Ravemcnt Maint

oflice

of Resear

The Minnesota L

ment

distress ma

pwnmnt

d

are also given, a

tdfic, or

con-.

D i m m

Manual

aconnpanying

re

M i n m o t o Citie

Smrias

at 651-2


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CRACK TREATMENTS


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FuMcph crsck

rep&

involves milling a trench centered over an existing

crack,

pbcing

hot-mix asphalt HMA) into the d r in one or

more

lifts,

and

mpact ing

to a c h i i

density.

Milling depth

varies

from vz inch for sacks in good condition, to

full

depth

for

pawments

with severe deteriontion in the crackvidnity. The mill width

varies

from 10

to

12 inches

for

shallow milling to 3

to4 inches

for deep

milling.

When

W n g

he

con@uration

of

the

area

to

e

milkd,

the

trench

should be wide enough to ensure good compaction.

lt

is difficult to

a c h i i

good

mpaction in a deep and nammtrench.

* Release trafficafter

mixture

has

been

compacted and

c u d .

*

Ropcrfy

drain cradcr mat have been milled and cleaned out if

they

are

albwed

to

stand beforenew asphalt cwry s placed.

WMknunshii an

sequence:

1

Minoutthe

2. If

needed,

u

3. vscuum out

4.

Tsdc

the rrr

5.

Place

hot m

6. C o m p a c

mtnt


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Haawld

lMQl

-NccMlon

3w

m

*

CSS-1

or

CSS-lh diluted

wkh an

equal

arnamt d m h

mdyap d at0.0

surface temperature of

at

kast 509

and

rising

are

recummenfled.

kal coat 2 m Ulc

only

on a

dean

pavement

surface.

ISW II.c

*

X he--

application rates

for binder and

ageregates

Use highqualily

materials.

Minimizethe distancebetween the disttibutor and the

spmada.

Placeaggreg

*

Use

at

least

three ollers, all

at maximum

speed of 5 mph.

Gmpl&e compac

S w n p

the roadway as soon as possible, and no later than the next rnominp.

*

Pwwnent should be

dry and

dean, and

dl

neacrury n@rs or recondi ioning

Place

when

boththe

air

and

pavement

temperature

are at

least

5o.F

and

the

Follow mix

design

carefully.

Ideal for high-volume roads.


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UWRlzl- Fo#sul

A- n d 1ern.ppMonofdhted

asphalt

Hrmkion

wi ihou ta

cowraggre-

9s ,wed ta

seal andmi the a@

pamnentsurfxe,

seal

minor

a d ,

prewnt mding,

and provide shoulder delineation.

Pavement

rhoukl

be

dry and

dean,

and

a l neccrraiy repairs or recondition

ing

w o k should becompleted wior to placing the

fog

seal. Place sealer

wi h

an

asphalt distributor.

0 The app hlio n rate is key. Emulsion rates usually ranw from 0.05 to 0.15

gallsy. Keep the applicationrate

low

to p e n t splashing and decreased

skid

rrriat;mce. A spraying temperatureof 125 to 1

and

surface tem

perature

of

a t least

50°F

and rising are recommended.

* Apply when temperatulw are

warm

or hot

Cool

temperatures require

k q e r curing times prior to opming

the

roadway to M c .

*

Keep

tra off the emulsion until it has cured. Sand cover may also be

used to improvethe surface friction.

* UK asphalt

em

CSS-1 H) or pro

Don’t over-app

Use CSS-1

or -

mvement surfa

.,

Pavementshould be


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k n a t ~ * r ( l k . n * r + ~ r o a d r w c . k n u n l i l * J I ~ k r c

3. Apply cover a

~ ~ ~ * ~ ~ k

4.

Roll

the

~

chip-s

.nvdMe kas.

should be the

m==

5. Sweep excess

WFhMrdunuw l

n n m c r s e

face.

This m a

~ * r + d a h

are used.

2 Usea

minimum o


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D a W - p d d

ut-mlx

we- are wcd to impfwe

the

undiond hen-

Specification

23

stwcWrd9

condihn

of the

pavement.

Thicktwwes wc

l ess than

2

inches.

Compaction

is

* Milling

or w i n g

a

leveling w x

should

precede thin

HMAs where

pave- 31n-inch minus

ments

need

crewsection improvements.

In

addkion,

d cracks

should

be

Isskd

@or

to

apphtion. Tack coats

are ne esmy

when

using

thin

HhlAs.

N*ximum

aggmgate size is

haif

the

i f t thidcmrr.

Asgmgate one-third

times the

l i f t

thickness

is

preferred.

*

Mixes

should

k

placed

in

warm

wdt ter

(55T

minimum) and must

be

ro#ed immediitely. Due to

their

bow

mais

they

lose

heat

veiy

quickly, and

achieving

density

is only

possible

if

they am compacted

while

still

hot.


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Thir s w b h nduda inkmulion on both permanent and smporary W n g .

3.

Backfill

the exc

F 6 r b o * ( y p c r o f ~

directly from t

*

Urc high-qUJicI

patding mabtial.

the mix carefu

C0mp.a-

pa6ch, even

by

driving overthe patch with

a

truck center of the p

* h w wclld

WD

ylu pakh Hu-don’t mmW it

in.

should be flush


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-siwwpMvlrukran

bcornpti bk with

water,

the

crack

dar not

Hot Mi


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Technique

All

Tip

Quality control and density are very important to obtaining good performanc

Use

high-qua li i patching materials, which are cost-effective compared with

Hot

Mix

Cold Mix

because

they

don’t

last.

Use high-qualii mix on permanent patches.

*

when using cold mix in heated hoppers, watch temperatures. Do not heat m

temperatures, binder

may

harden.

Use year-round for t e m m w Datches


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M c m i ~wch.12

somaimr

d e d stockpile

patching

mixture, consists of a

plant-mixed material made

of

a suitable binder, a mnpatbk rggrcgate,and

an ;irddi iucb rnoisture resistance.

Use a mqurlty material. Severalpmprietary mixes are .v*kMc as

well

as Mn/D


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I


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Uuny

or rnlawurfadng crack Wing involves pk ing a slurry-which is a

mixture

of

aggregate, asphalt emulsion, and a mineral

filler such

as Portland

cernen-into a wide crack and striking

it

off with a squeegee. Slurry-filling

cracks

s good for roadways with severe transverse cracks and/or depressed

transverse cracks. A 3-foot-widesqueegee, with sideboards,

is

typically used

to

feather the material into the depressed areas.

Aggregates for slurry mixes may consist

of

most hard-crushed aggregates

such as granite, limestone, trap tu slag, and taconite tailings. They conform

to

one

of three gradations: MnlDOT 3139 Type 1 Type 2, and Type

3.

The

maximum size for slurry aggrevtes is 2.36 mm X8 sieve) for Type 1 and 9.5

mm

Wkinch sieve) for Type

2

and

3.

Type

3 h a s a coarser

gradationthan

Type 2. All slurry gradations have between

5

and 15

percent

passing the 75-

micron sieve X200).

*

Crack preparation should indude milling and blowing loose materialfrom

the cracks The cure rate ranges from 30 minutes to 1 hour, depending on

the air temperature, humidity, and materials used.

* Because

of

required cure period, do not

use

slurry to MI deep

cracks

or cracks

tha

Avoid late se

Allow materi

*

Rut W i g

s

o

paction of the

or structurall

~ d o l i n e s

Ruts

114

to

314

Ruts greater th

Ruts

gm ter th

The maximum


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Sluny or

Microsurfacing

Material continued

The construction

sequence

is:

1.

Mi ll and blow o ut existing depressions, if d esired.

2.

Position slurry unit o ver the crack or depression

to

be filled.

3.

Deposit sufficie

c a d c

4. Strike off the m

Deposit suficient

sluny

to fill

crack.

2 Strike off

slurty

material.


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asphalt pavment maintenance filed book

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