2 Pavement Distress Handout

8/21/2019 2 Pavement Distress Handout

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Pavement Distresses

Flexible Pavement

Sponsored by: Minnesota LTAP Center

Presented by: Michael Marti, P.E.SRF Consulting roup, !nc.

"an #eg$an, P.E.Se$Materials



Various Rating Manuals

% Pa&e$ent Rehabilitation: A Guide for Minnesota Cities andCountiesM' LRR(

% "istress !denti)ication )or theLong Ter$ Pa&e$entPer)or$ance Progra$ S*RP



Identifying the Distress is

the 1st Step in the Process



Identifying Distresses Includes

% 'a$e

% Se&erity

% A$ount

“Rate what you see and not what youthink.”



!rac"ing

% Types + Fatigue

+ Ther$alTrans&erse

+ (loc- + Edge

+ Longitudinal

+ Re)lection

+ Slippage



Fatigue !rac"ing

% Causes

+ !nsu))icient strength

+ End o) pa&e$ent li)e

+ Too hea&y o) loads% Cures

+ Re$o&e and replace

+ Mill and o&erlay



#hermal !rac"ing $#ransverse%

• Causes

+Contraction and

Epansion o) Pa&e$ent

/ith Changing

Te$peratures

• Cures

+Crac- Filling

+Full0"epth Recla$ation

+Thic- 1&erlay



&loc" !rac"ing

% Causes + *igh 2oid Content

+ 1idati&e *ardening o) the AC

+ Ther$al Crac-ing% Cures

+ Crac- FillingSealing

+ Seal Coat

+ Full0"epth Recla$ation

+ Thic- 1&erlay



'dge !rac"ing

% Causes

+ Soil Mo&e$ent (eneath

Pa&e$ent

% Cures + Crac- FillingSealing




(ongitudinal !rac"s

% Causes

+ Lo/ Te$peratures

% Cures

+ Crac- Sealing

+ Thic- 1&erlay



Reflective !rac"ing

% Causes + Eisting crac-s or 3oints in the

underlying structure

+ Concrete slab $o&e$ents

% Cures

+ Crac- Filling + Etensi&e Pre01&erlay Repair

+ Rubbli4ing

+ Crac- 5 Seat

+ Sa/ 5 Seal

+ !nterlayer



Slippage !rac"ing

% "escription

+ 60shaped crac-s in areas o) bra-ing, turning, accelerating

% Causes

+ Poor bond bet/een asphalt sur)ace and underlying layer

% Cures

+ Crac- FillingSealing




Surface Defects

% Rutting% Sho&ing

% (leeding

% Polished Aggregate

% Ra&eling

% Potholes

% Patching



Rutting

% Causes + Lo/ Air 2oids

% Asphalt contenttoo high

+ S$ooth, Rounded Aggregate%

Ecessi&e a$ountso) natural sand

+ Ecess "ust

% Cures + Re$o&eReplace 788 $$ 9 inches;

+ Micro0sur)acing



Shoving

% Causes

+ 6nstable Mi

+ (ra-ing, stopping or

accelerating tra))ic + Slippage bet/een layers

% Cures

+ Re$o&e and Replace

+ Mill and 1&erlay + Thic- 1&erlay



&leeding

% Causes + Too high asphalt content

% too rich a plant $i

% i$properly constructed

seal coat% too hea&y pri$e or tac-

coat

% Cures + Sand blot

+ Micro0sur)acing + Seal coat



Polished )ggregate

% Causes

+ So)t aggregate

+ *ea&y tra))ic

% Cures + Seal coat

+ Micro0sur)acing

+ Thin 1&erlay



Raveling

% Causes + Asphalt binder unable to hold

aggregate in place% dusty aggregates

% segregation

% lo/ in0place density

% aged asphalt binder % Stripping

% Cures + Seal Coat

+ Micro0sur)acing

+ Thin 1&erlay



Potholes

% Causes

+ Ra&eling o) crac-s

+ Moisture da$age

+ Free4e0tha/ + !nsu))icient strength

% Cures

+ Patch



Patch Deterioration

% Causes + Poor bonding to eisting pa&e$ent

+ !$proper co$paction

+ Poor $aterials

+ Propagation o)original distress

% Cures + Re$o&e and replace

+ Re0patch

+ Assess original distress



Miscellaneous Distresses

% Lane0to0shoulder "rop o))

% #ater (leeding and

Pu$ping



(ane to Shoulder Drop off

% Cause

+ "i))erences in $aterials

used )or lane and shoulder

+"i))erential settle$ent

+ !nsu))icient co$paction o)

base

% Cures

+ #edgele&eling o&erlay

+ Micro0sur)acing



*ater &leeding and Pumping

% Causes

+ Crac-s

+ !nade<uate drainage

% Cures + Full0depth patch

+ Crac- seal

Documents

2 Pavement Distress Handout