Previous in Forum: Unknown   Next in Forum: High-Rise Fire in Dubai, Flammable Windows
Close
Close
Close
34 comments
Power-User
Engineering Fields - Electrical Engineering - New Member Engineering Fields - Power Engineering - New Member

Join Date: Mar 2012
Location: the sandbox
Posts: 340
Good Answers: 6

Airport Runway Pavement Materials and Cracking

03/19/2015 3:02 AM

1. what material (maybe plasticized bitumenous or plasticized asphalt) is used to pave Heathrow and similar large airports? I understand its not concrete anymore becsause of cracking.

2. Our runway handles heavy jets up to about 570,000 lbs (250,000 Kg.). Its touchdown zone is currently paved in 14" (35 cm) of 4000 psi (K-280 or 27,500 kilo pascal) concrete with no steel reinforcing bars but with one layer WWF (woven wire fabric). It is paved with concrete slabs measuring about 6 m x 6m.

3. Beause of cracking at the corners, We replaced these slabs with 16" (40 cm) of 5000 psi (K-350 or 34,400 kilo pascals) concrete, buit the new concrete still cracks at the corners. So we are considering replacing it with some type plasticized asphault or bituminous pavement. What do you recommend we use?

__________________
BSEE but always learning
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Guru
Popular Science - Biology - New Member Hobbies - Musician - New Member APIX Pilot Plant Design Project - Member - New Member Hobbies - CNC - New Member Fans of Old Computers - ZX-81 - New Member

Join Date: Jan 2007
Location: Centurion, South Africa
Posts: 3921
Good Answers: 97
#1

Re: Airport Runway pavement materials and cracking

03/19/2015 4:20 AM

Did you investigate the effect of the geology in your area?

__________________
Never do today what you can put of until tomorrow - Student motto
Register to Reply
Power-User
Engineering Fields - Electrical Engineering - New Member Engineering Fields - Power Engineering - New Member

Join Date: Mar 2012
Location: the sandbox
Posts: 340
Good Answers: 6
#2

Re: Airport Runway pavement materials and cracking

03/19/2015 4:31 AM

well that maybe part of the problem. not only does the native soil contain 5% montmorillonite, which swell when wet, but there is an underlying impervious calcite rock layer only about 1 meter down. however, the soil was well compacted to 96% plus. and there was a sub-base for the concrete. But even our CE is stumpped by this. IMHO a 250,000 kg jet landing at 200mph is a very heavy load for 14" - 18" slabs of 4000 psi concrete with no rebar, only welded wire fabric..

__________________
BSEE but always learning
Register to Reply
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15247
Good Answers: 939
#3

Re: Airport Runway Pavement Materials and Cracking

03/19/2015 9:18 AM

I remember somebody telling me many years back that concrete will always crack. I believe the little grooves put into the thin slab of a sidewalk are to allow aesthetically graceful cracks to happen. I'm mildly surprised that you have no reinforcing bars in a runway. The flexing of that bed from landings and takeoffs will repeatedly put the slab under tension conditions. The rock and aggregate under bed along with the soil compaction, drainage, and composition will also be a factor.

Take my civil engineering comments with a pound of salt. As you know, I'm not a civil engineer. If this is more than just casual speculation, you need a licensed civil engineer to to look at the design and execution of this runway.

Hopefully Capt. Moosie can provide some insight that won't require a fee.

__________________
"Don't disturb my circles." translation of Archimedes last words
Register to Reply
Guru

Join Date: Jul 2008
Posts: 1565
Good Answers: 139
#4

Re: Airport Runway Pavement Materials and Cracking

03/19/2015 9:56 AM

I don't know the answers but this is an interesting post.

I suspect "people in the know" will need to know a little more to give a good answer. What country are you in? You may or may not want to give the exact location but temperature extremes, geology, typical materials/procedures in that area, concrete and water chemistry, woven wire fabric details, etc. might all help.

__________________
Few things limit our potential as much as knowing answers and setting aside questions.
Register to Reply
Guru

Join Date: Feb 2011
Posts: 7025
Good Answers: 206
#5

Re: Airport Runway Pavement Materials and Cracking

03/19/2015 11:12 AM

you're kidding me right? the soil beneath your surface is known to swell and you're wondering if a different surface wont crack?? where is Moosie and his compaction machine? attempting to patch poor soil preparation is too late, tear it out, do it correctly and move on to other issuers.

Register to Reply
Guru
Popular Science - Biology - New Member Hobbies - Musician - New Member APIX Pilot Plant Design Project - Member - New Member Hobbies - CNC - New Member Fans of Old Computers - ZX-81 - New Member

Join Date: Jan 2007
Location: Centurion, South Africa
Posts: 3921
Good Answers: 97
#6

Re: Airport Runway Pavement Materials and Cracking

03/19/2015 4:01 PM

Now I am curious about the other 95% at the top.

__________________
Never do today what you can put of until tomorrow - Student motto
Register to Reply
Active Contributor

Join Date: Jun 2009
Posts: 23
#7
In reply to #4

Re: Airport Runway Pavement Materials and Cracking

03/19/2015 10:23 PM

Davis??

Register to Reply
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15247
Good Answers: 939
#8
In reply to #7

Re: Airport Runway Pavement Materials and Cracking

03/19/2015 10:29 PM

Who is that?

__________________
"Don't disturb my circles." translation of Archimedes last words
Register to Reply
Guru
Safety - Hazmat - New Member Engineering Fields - Mining Engineering - New Member Engineering Fields - Construction Engineering - New Member Hobbies - Hunting - New Member

Join Date: Dec 2006
Location: Scottsdale, AZ
Posts: 1014
Good Answers: 12
#9

Re: Airport Runway Pavement Materials and Cracking

03/19/2015 10:48 PM

Have you gone on FAA's website. Here in the US they are the ones that design airport runways.

__________________
John J Baker
Register to Reply
Guru
United States - Member - New Member

Join Date: Mar 2010
Location: In the pool because it is too hot.
Posts: 3053
Good Answers: 140
#10

Re: Airport Runway Pavement Materials and Cracking

03/19/2015 11:31 PM

Your slabs are 6 X 6 meters and the corners show cracks?

How are they put in place? Do you have full cut through seems between the panels?

Are they poured on the spot?

What is the distance between the wheels of your jets? Perhaps you should change the

width to a different size (reducton), so that the landing tracks are more diverted away from the edges.

Some pictures would help us show how the cracks occur and what to be done as remedy.

What is your WWF made of and where in the slab is it situated?

__________________
Plenty of room here
Register to Reply
Associate

Join Date: Feb 2015
Location: Canada's West Coast , Pacific.
Posts: 34
#11

Re: Airport Runway Pavement Materials and Cracking

03/19/2015 11:38 PM

You sound as though you are in fact the Civil Engineer in charge of the repavement . Who doesn't know what country Heathrow is in ? Corners cracking is a good one , other than high PSI concrete , in order to increase the weight capacity in your heavy aircraft landing zone you would almost have to experiment with some sort of elastic polymer . I would be interested in finding the one that could withstand large aircraft hitting it myself . May I make a recomendation ? There is a little known technique whereby when concrete is poured and mixed , a polymer fiber is added to enhance concrete's elastic properties . Various strong thread fibres come to mind , the toughest may be Boron . Boron is added to resin matrix for the same reason , it's a fiberous thread , but has qualities which make it one of the toughest re inforcement fibres available .

Dragon113 Canada

__________________
Steele113
Register to Reply
Active Contributor

Join Date: Feb 2014
Posts: 24
#12

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 2:07 AM

I believe that if u want ZERO cracks on the landing patch of a runway (at both ends) U need to drive pillars (stilts) into the ground at the said location. and build on that. I am SURE nothing will give once settled.

An 'exaggerated' runway on stilts is Madeira Airport in Portugal. Nothing moves.

Register to Reply
Power-User
Engineering Fields - Electrical Engineering - New Member Engineering Fields - Power Engineering - New Member

Join Date: Mar 2012
Location: the sandbox
Posts: 340
Good Answers: 6
#13

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 2:53 AM

Im not the CE in charge of this. The CE, is scratching his head on has no answers to this one. The native soil is "gatch" defined here http://www.sciencedirect.com/science/article/pii/0013795268900136

which does indeed swell when wet. The 6m x 6m slabs are poured in place. And of course the slab is kept wet while curing in the 50 degrees C ambient. Cracking does not occur during the curing process, but for example 6 - 12 months after the pour.

They are poured in checkerboard fashion and dowelled to each other on one side only.

This is in Kuwait desert where temperatures vary from 0 degrees C to 50 degrees C.

It does rain average 4-5" per year. Because of the different planes that use the runway (small F-16, medium C-130, heavy C-17) we cant plan on any specific wheels landing in any exact location.

What I was hoping for is:

1. something like the boron or polyester fiber admix for concrete limit cracking, or

2. a more flexible pavement than concrete, but able to handle a landing of 250,000 kg jet going 200 mph. I really think we need to go to plasticized bituminous or plasticized asphault.

__________________
BSEE but always learning
Register to Reply
Guru

Join Date: Mar 2012
Location: Out of your mind! Not in sight!
Posts: 4424
Good Answers: 107
#14
In reply to #13

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 6:20 AM

The concrete is only as good as the underground. Usually streets need a good preparation for the bottom layers. The same for your runway. I would dig out the soil and replace with sand not Gatch. When reading the description it cries out loud replace me. Then any concrete will be good. Reinforcing it will depend on the loads.

The CE is scratching his head aha. I could come up with a neat little expensive solution, but it has to be paid work.

Runways should not be rocket science. If you want to know about Heathrow why not find out who build it and what they used?

__________________
Common Sense Dictates
Register to Reply
Guru
Safety - Hazmat - New Member Engineering Fields - Mining Engineering - New Member Engineering Fields - Construction Engineering - New Member Hobbies - Hunting - New Member

Join Date: Dec 2006
Location: Scottsdale, AZ
Posts: 1014
Good Answers: 12
#15
In reply to #9

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 7:02 AM

Not sure who did your design work, but FAA requires 7 lifts. Totaling 78" starting below the surface. Usually 6" of asphalt concrete 16" of cement concrete the rest is subgrade Mixture. Concrete slabs are poured slip form, no slabs. This is also the design matrix we used at several military bases here in the US including Luke Airforce base Glendale, AZ.

__________________
John J Baker
Register to Reply
3
Guru
Hobbies - DIY Welding - New Member Hobbies - Target Shooting - New Member Engineering Fields - Civil Engineering - New Member United States - Member - New Member

Join Date: May 2009
Location: Red Hook, New York (Mid-Hudson River Valley)
Posts: 4364
Good Answers: 177
#16

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 8:18 AM

I wonder what the OPs relationship to the Airport is? Comments? Who's the Engineer of Record for this work, and what is his assessment, or is there not an engineer involved at the time? Also, what is the age of the runway concrete panels in question? Approximately how many aircraft landings has it seen, as in equivalent jumbo jet main landing gear loadings?

Okay, I'll be the first to admit that I do not know what the UK and Euro airport design parameters are, but I do know what the US's FAA and DoD design and construction parameters are. But in the end, rigid concrete pavement failure forensics are universal Worldwide.........

Without knowing the particulars, it's is very hard to make any truly "spot-on" engineer assessment in regard to the supposedly concrete panel failures.

First, we would need to know the results of the concrete field and laboratory testing results when the pads were constructed, such as: Concrete Compression tests, concrete temperature, encountered weather conditions, slump tests, additional water added (if any), concrete batch composition, and air entrainment tests. We would also need a copy of the concrete technical specifications to ascertain whether the concrete that was placed within acceptable ranges. How were the concrete panels protected and cured, and for length of time?

Secondly, we would need to know the results of the subgrade field and laboratory testing results when the pads were constructed, such as: modulus of subgrade reaction, sieve analysis, etc. What did the in-situ soil analysis reveal, and what recommendations were offered? Were they followed by the Engineer of Record and the Contractor?

I do question the use of a singular layer of welded-wire-mesh. In what manner was it placed? Was there sufficient mesh overlap? What are the WWM bar sizes and spacings? At what depth in the concrete panels was it installed? Get my drift?

I also question the use of a such a thin concrete panel. It just doesn't "feel" correct, especially in light of the aircraft wheel loads, touchdown speeds, and resulting impacting factor. Even a 5,000 psi concrete compressive strength feels "light".

No way in hell would I have placed new concrete runway panels atop a subgrade material that is known to have undesirable characteristics, especially when it becomes wet. It's nearly unheard of here in the USA to construct a major international runway without a proper thoroughly subbase layer. Typically, the FAA requires geotech fabric or geogrid material at the subgrade-subbase interface AFTER the in-situ subgrade has been thoroughly compacted and able to take wheel-loading tests to demonstrate satisfactory resiliency and stability.

What the OP didn't tell us is the degree of slab corner cracking, crack widths, and if the cracks extend down through the entire slab depth. Have concrete coring samples been done at any of the cracks and examined?

Is there subsurface runway drains in place that collect groundwater and dispose of it? If yes, how were they constructed and are they working adequately, or are they silted-up?

Are the individual concrete panels edges feature smooth dowel bars that are used to transfer shear loadings from one concrete panel to the next? Typically, that is what is used here in the US. Most shear problems in heavily loaded concrete panels are the highest at panel edges and especially at panel corners.

In conclusion, I believe, based on the limited amount of data provided, that the following factors have lead to the concrete panel failures: Insufficient undercutting and removal of unstable subgrade soils; possible insufficient subsurface drainage to aid groundwater removal, and improving the subgrade stability and load carrying capacities; nonexistence of a proper subbase supporting a rigid concrete pavement; insufficient thickness of the rigid concrete panels; possible under-reinforced concrete panels; and, possible absence of smooth dowel bars along the edges of the panels to aid in load transference to adjacent panels.

BTW, I do appreciate the comments from you guys about "Where's Moosie?" LOL

__________________
"Veni, Vidi, Vici"; hendiatris attributed to Gaius Julius Caesar, 47 B.C.
Register to Reply Good Answer (Score 3)
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15247
Good Answers: 939
#17
In reply to #16

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 9:05 AM

Excellent!

I'm so glad you heard our calls. Your "back of the envelope" analysis of the plausible collection of reasons for these ill-defined cracks is again very rewarding for me.

The only remote possibility that comes to my layman's mind that you did not touch upon is a real geologic change in the sub-grade below all previous construction work. This could be from natural (quake, sink hole) or man made (oil extraction, water diversion) origins. Ground penetrating radar or seismic acoustic testing might reveal these possibilities without extensive excavation.

Thank you once again. That was fun.

__________________
"Don't disturb my circles." translation of Archimedes last words
Register to Reply
Guru
Hobbies - DIY Welding - New Member Hobbies - Target Shooting - New Member Engineering Fields - Civil Engineering - New Member United States - Member - New Member

Join Date: May 2009
Location: Red Hook, New York (Mid-Hudson River Valley)
Posts: 4364
Good Answers: 177
#18
In reply to #17

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 9:22 AM

Fred, you're very welcome!

You are correct, I didn't touch on the geology aspects too much. I have no idea if there was any soil borings and other testing conducted. I don't even know if Hydraulic Fracturing is conducted in the UK or if it was done near the airport. I don't think that's an issue here. Crappy soil and inadequate runway design most certainly is.

I don't know about sink holes developing here, as we don't know the full breathe and extent of the problems. If the panel cracking is localized, than sinkholes or subgrade soil subsistence may be a factor. If the problem is more widespread I believe that a weak subgrade and nonexistent subbase grade, coupled with an inadequate rigid pavement is more to blame.

For the life of me, I cannot understand the engineering reasoning behind the resultant construction of the runway for such an important international airport. It just doesn't make sense, or did cost or political considerations enter too much into the mix? Unfortunately, the OP hasn't given us the full history behind the runway project.

I also blame faulty engineering for the panel corner cracking...

__________________
"Veni, Vidi, Vici"; hendiatris attributed to Gaius Julius Caesar, 47 B.C.
Register to Reply
Guru
Safety - Hazmat - New Member Engineering Fields - Mining Engineering - New Member Engineering Fields - Construction Engineering - New Member Hobbies - Hunting - New Member

Join Date: Dec 2006
Location: Scottsdale, AZ
Posts: 1014
Good Answers: 12
#19
In reply to #16

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 9:32 AM

Moosie

P-501 psi design is 4000. Breaks should usually be around 8-10k at 28 days. As you stated there is very little info. Being in Kuwait in the desert if anything like AZ swelling shouldn't be an issue, as least not enough to cause damage to a runway.

Question was runway built by US military contractors or by Kuwaiti? If by US they should have been following FAA and DOD requirements, which can easily be looked up.

__________________
John J Baker
Register to Reply
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15247
Good Answers: 939
#20
In reply to #19

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 9:37 AM

If this was a US military built runway in Kuwait then there is a possibility the runway was intended to be temporary in the first place.

__________________
"Don't disturb my circles." translation of Archimedes last words
Register to Reply Score 1 for Good Answer
Guru
Safety - Hazmat - New Member Engineering Fields - Mining Engineering - New Member Engineering Fields - Construction Engineering - New Member Hobbies - Hunting - New Member

Join Date: Dec 2006
Location: Scottsdale, AZ
Posts: 1014
Good Answers: 12
#21
In reply to #16

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 9:41 AM
__________________
John J Baker
Register to Reply
Guru
Hobbies - DIY Welding - New Member Hobbies - Target Shooting - New Member Engineering Fields - Civil Engineering - New Member United States - Member - New Member

Join Date: May 2009
Location: Red Hook, New York (Mid-Hudson River Valley)
Posts: 4364
Good Answers: 177
#22

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 9:44 AM

My screw up.....why was I thinking this was at Heathrow in the UK? Ughhhhh...misread a few comments.

__________________
"Veni, Vidi, Vici"; hendiatris attributed to Gaius Julius Caesar, 47 B.C.
Register to Reply
Guru
Safety - Hazmat - New Member Engineering Fields - Mining Engineering - New Member Engineering Fields - Construction Engineering - New Member Hobbies - Hunting - New Member

Join Date: Dec 2006
Location: Scottsdale, AZ
Posts: 1014
Good Answers: 12
#23
In reply to #20

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 9:44 AM

My thought exactly once the OP mentioned military equipment. I though of first Gulf War and the runways the US and allied forces massed produced.

__________________
John J Baker
Register to Reply
Guru
Hobbies - DIY Welding - New Member Hobbies - Target Shooting - New Member Engineering Fields - Civil Engineering - New Member United States - Member - New Member

Join Date: May 2009
Location: Red Hook, New York (Mid-Hudson River Valley)
Posts: 4364
Good Answers: 177
#24

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 9:50 AM

BakerJohn: Although I've never have designed an airport runway using Prestressing tendons, at first glance it looks like it has some advantages and merit.

I tend to like this design approach a lot! Thanks!!!!

__________________
"Veni, Vidi, Vici"; hendiatris attributed to Gaius Julius Caesar, 47 B.C.
Register to Reply
Guru
Hobbies - DIY Welding - New Member Hobbies - Target Shooting - New Member Engineering Fields - Civil Engineering - New Member United States - Member - New Member

Join Date: May 2009
Location: Red Hook, New York (Mid-Hudson River Valley)
Posts: 4364
Good Answers: 177
#25

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 9:53 AM

Who designed this Air Base, the US. Army corps of Engineers, or some engineering firm under contract with the DoD or the Kuwatis?

__________________
"Veni, Vidi, Vici"; hendiatris attributed to Gaius Julius Caesar, 47 B.C.
Register to Reply
Power-User
Engineering Fields - Electrical Engineering - New Member Engineering Fields - Power Engineering - New Member

Join Date: Mar 2012
Location: the sandbox
Posts: 340
Good Answers: 6
#26

Re: Airport Runway Pavement Materials and Cracking

03/20/2015 12:46 PM

Sorry, no records available that old. No records available before 2000.

But I found what I need:

Marshall Asphault

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/33545/spec_132009.pdf

__________________
BSEE but always learning
Register to Reply
Active Contributor

Join Date: Jun 2009
Posts: 23
#27
In reply to #26

Re: Airport Runway Pavement Materials and Cracking

03/22/2015 7:00 PM

Two questions:

What will be the surface temperature of the runway in 50 degree C full sun?

Will the Marshall Asphalt support landing load stresses at that temp?

Register to Reply
Power-User
Engineering Fields - Electrical Engineering - New Member Engineering Fields - Power Engineering - New Member

Join Date: Mar 2012
Location: the sandbox
Posts: 340
Good Answers: 6
#28

Re: Airport Runway Pavement Materials and Cracking

03/23/2015 1:42 AM

GoodGuy, this is is the same material used in military airfields (including Little Heathrow) is southern Afghanistan desert at similar climate. One of its advantages is easy maintenance, the top 4" or so is millable and replaceable as needed.

__________________
BSEE but always learning
Register to Reply
Active Contributor

Join Date: Jun 2009
Posts: 23
#29
In reply to #28

Re: Airport Runway Pavement Materials and Cracking

03/23/2015 11:59 AM

Glad to know that considered that.

Happy landings!

Register to Reply
Guru

Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4333
Good Answers: 130
#30
In reply to #15

Re: Airport Runway Pavement Materials and Cracking

04/25/2015 4:27 AM

You mean with no rebars? I'd be as surprprised by that as Redfred in #3, but then I'm not a civil engineer either.

__________________
Give masochists a fair crack of the whip
Register to Reply
Guru
Safety - Hazmat - New Member Engineering Fields - Mining Engineering - New Member Engineering Fields - Construction Engineering - New Member Hobbies - Hunting - New Member

Join Date: Dec 2006
Location: Scottsdale, AZ
Posts: 1014
Good Answers: 12
#31
In reply to #30

Re: Airport Runway Pavement Materials and Cracking

04/25/2015 4:50 AM

Rbear is never used is in slip form for roadways or run ways. The not like something going to be sitting on it. The object is on then off rapidly. You don't believe me ask moosie or read up with a road design manual.

__________________
John J Baker
Register to Reply
Guru

Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4333
Good Answers: 130
#32
In reply to #31

Re: Airport Runway Pavement Materials and Cracking

04/25/2015 6:40 AM

OK I wasn't questioning your ability, just curious

__________________
Give masochists a fair crack of the whip
Register to Reply
Guru
Safety - Hazmat - New Member Engineering Fields - Mining Engineering - New Member Engineering Fields - Construction Engineering - New Member Hobbies - Hunting - New Member

Join Date: Dec 2006
Location: Scottsdale, AZ
Posts: 1014
Good Answers: 12
#33
In reply to #32

Re: Airport Runway Pavement Materials and Cracking

04/25/2015 9:08 AM

It's good to question, it's how we learn. Captain Moose should be able to verify or correct my statement. I've work in heavy construction in all phases design, construction, and maintenaince; but I've specialized in QC, materials, environmental, and safety in those phases.

__________________
John J Baker
Register to Reply
Guru
Hobbies - DIY Welding - New Member Hobbies - Target Shooting - New Member Engineering Fields - Civil Engineering - New Member United States - Member - New Member

Join Date: May 2009
Location: Red Hook, New York (Mid-Hudson River Valley)
Posts: 4364
Good Answers: 177
#34
In reply to #33

Re: Airport Runway Pavement Materials and Cracking

04/25/2015 9:36 AM

BakerJohn is correct. Slip-formed concrete pavements have no rebar.

__________________
"Veni, Vidi, Vici"; hendiatris attributed to Gaius Julius Caesar, 47 B.C.
Register to Reply
Register to Reply 34 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Copy to Clipboard

Users who posted comments:

1capybara (4); Adnaan146 (1); bakerjohn (7); BruceFlorida (1); CaptMoosie (6); Codemaster (2); Dragon113 (1); dvmdsc (1); Fredski (1); GoodGuy (3); Hendrik (2); IdeaSmith (1); redfred (4)

Previous in Forum: Unknown   Next in Forum: High-Rise Fire in Dubai, Flammable Windows

Advertisement