2 Pavement Distress Handout
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Transcript of 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
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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
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Identifying the Distress is
the 1st Step in the Process
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Identifying Distresses Includes
% 'a$e
% Se&erity
% A$ount
“Rate what you see and not what youthink.”
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!rac"ing
% Types + Fatigue
+ Ther$alTrans&erse
+ (loc- + Edge
+ Longitudinal
+ Re)lection
+ Slippage
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Fatigue !rac"ing
% Causes
+ !nsu))icient strength
+ End o) pa&e$ent li)e
+ Too hea&y o) loads% Cures
+ Re$o&e and replace
+ Mill and o&erlay
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#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
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&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
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'dge !rac"ing
% Causes
+ Soil Mo&e$ent (eneath
Pa&e$ent
% Cures + Crac- FillingSealing
+ Full0"epth Recla$ation
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(ongitudinal !rac"s
% Causes
+ Lo/ Te$peratures
% Cures
+ Crac- Sealing
+ Thic- 1&erlay
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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
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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
+ Full0"epth Recla$ation
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Surface Defects
% Rutting% Sho&ing
% (leeding
% Polished Aggregate
% Ra&eling
% Potholes
% Patching
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Rutting
% Causes + Lo/ Air 2oids
% Asphalt contenttoo high
+ S$ooth, Rounded Aggregate%
Ecessi&e a$ountso) natural sand
+ Ecess "ust
% Cures + Re$o&eReplace 788 $$ 9 inches;
+ Micro0sur)acing
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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
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&leeding
% Causes + Too high asphalt content
% too rich a plant $i
% i$properly constructed
seal coat% too hea&y pri$e or tac-
coat
% Cures + Sand blot
+ Micro0sur)acing + Seal coat
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Polished )ggregate
% Causes
+ So)t aggregate
+ *ea&y tra))ic
% Cures + Seal coat
+ Micro0sur)acing
+ Thin 1&erlay
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Raveling
% Causes + Asphalt binder unable to hold
aggregate in place% dusty aggregates
% segregation
% lo/ in0place density
% aged asphalt binder % Stripping
% Cures + Seal Coat
+ Micro0sur)acing
+ Thin 1&erlay
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Potholes
% Causes
+ Ra&eling o) crac-s
+ Moisture da$age
+ Free4e0tha/ + !nsu))icient strength
% Cures
+ Patch
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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
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Miscellaneous Distresses
% Lane0to0shoulder "rop o))
% #ater (leeding and
Pu$ping
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(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
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*ater &leeding and Pumping
% Causes
+ Crac-s
+ !nade<uate drainage
% Cures + Full0depth patch
+ Crac- seal