Major Concrete Issues Found in Silver Line Metro Extension

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Major Concrete Issues Found in Silver Line Metro Extension

Postby davinp » Wed Apr 25, 2018 12:29 pm

Significant concrete issues have been found in potentially thousands of locations along the second phase of the $2.7-billion Silver Line Metro extension in Northern Virginia, project officials say.

https://www.nbcwashington.com/traffic/t ... 29661.html
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby JDC » Wed Apr 25, 2018 12:39 pm

davinp wrote:Significant concrete issues have been found in potentially thousands of locations along the second phase of the $2.7-billion Silver Line Metro extension in Northern Virginia, project officials say.

https://www.nbcwashington.com/traffic/t ... 29661.html


I think the key takeaway is that most of the 'locations' are the pre-cast station 'walls' with a smaller amount in other areas. None seemed directly to have to do with structures holding up the rails.
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby YamaOfParadise » Wed Apr 25, 2018 1:02 pm

Were there separate contractors for the stations themselves?
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby Sand Box John » Wed Apr 25, 2018 1:10 pm

It would seem to me that somebody in quality control would have kept track of the weights of the raw material coming in and compared that to the weight of the finished product going out. The weight of the portland cement coming in not jiving with the cubic yards of the finished product going out should automatically throw up a red flag. Residencies in quality control should easily discover measuring calibration issues in the batch plant.
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby Chris Brown » Wed Apr 25, 2018 6:10 pm

Someone is definitely getting fired. Heads will roll.
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby JackRussell » Thu Apr 26, 2018 6:42 pm

JDC wrote:
davinp wrote:Significant concrete issues have been found in potentially thousands of locations along the second phase of the $2.7-billion Silver Line Metro extension in Northern Virginia, project officials say.

https://www.nbcwashington.com/traffic/t ... 29661.html


I think the key takeaway is that most of the 'locations' are the pre-cast station 'walls' with a smaller amount in other areas. None seemed directly to have to do with structures holding up the rails.


It isn't just walls, but there were precast sections that were assembled for the platform itself.
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby YOLO » Wed May 16, 2018 1:52 pm

Feds have stepped in and are now investigating a whistleblower claim for this: https://twitter.com/AdamTuss/status/996825463216594947

Looks like contractors falsified the QC data: https://pbs.twimg.com/media/DdV9mC6W0AA9fO8.jpg
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby Sand Box John » Wed May 16, 2018 7:54 pm

Silver Line concrete problems flagged a year earlier in whistleblower lawsuit
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What makes this more incredible is, someone in the food chain knew something was not as it was suppose to be around the time precast panel deliveries were beginning to be ramped up.
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby MCL1981 » Wed May 30, 2018 5:10 am

Sounds like the contractor held themselves to the same standard that WMATA employees hold themselves to...
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby Sand Box John » Fri Jun 01, 2018 8:58 pm

Things are really getting interesting:

Silver Line extension to Dulles awaiting test results on concrete issue
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby JackRussell » Wed Jul 11, 2018 4:40 am

Lawsuit in the works, and it is going to be ugly:

https://www.nbcwashington.com/news/loca ... wt_DCBrand


A whistleblower filed a civil lawsuit in 2016 alleging the concrete company altered testing results, including about water-to-cement ratios in some of the materials.

"I am being asked to constantly falsigy data that we send out to our clients in order to appear that the concrete is in specification," the whistleblower wrote in an email, according to the lawsuit.


So they knew about the problem back in 2016.
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby STrRedWolf » Thu Jul 12, 2018 7:56 pm

JackRussell wrote:Lawsuit in the works, and it is going to be ugly:

https://www.nbcwashington.com/news/loca ... wt_DCBrand


A whistleblower filed a civil lawsuit in 2016 alleging the concrete company altered testing results, including about water-to-cement ratios in some of the materials.

"I am being asked to constantly falsigy data that we send out to our clients in order to appear that the concrete is in specification," the whistleblower wrote in an email, according to the lawsuit.


So they knew about the problem back in 2016.


I wonder if it's the same concrete used in the Silver Spring Transit Center rebuild.
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby JDC » Thu Jul 19, 2018 7:57 am

STrRedWolf wrote:
JackRussell wrote:Lawsuit in the works, and it is going to be ugly:

https://www.nbcwashington.com/news/loca ... wt_DCBrand


A whistleblower filed a civil lawsuit in 2016 alleging the concrete company altered testing results, including about water-to-cement ratios in some of the materials.

"I am being asked to constantly falsigy data that we send out to our clients in order to appear that the concrete is in specification," the whistleblower wrote in an email, according to the lawsuit.


So they knew about the problem back in 2016.


I wonder if it's the same concrete used in the Silver Spring Transit Center rebuild.


I don't think it's the concrete itself, but the manufacturer/supplier. For Silver Spring, wasn't the issue how it was poured on site? i.e. it was done negligently/shoddily? For the Silver Line, it sounds like blatant fraud is the issue.
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby Sand Box John » Fri Jul 20, 2018 7:13 am

"JDC"

I don't think it's the concrete itself, but the manufacturer/supplier. For Silver Spring, wasn't the issue how it was poured on site? i.e. it was done negligently/shoddily? For the Silver Line, it sounds like blatant fraud is the issue.


STrRedWolf's comment should be place in a context of sarcasm.

The issues on each are totally different.

The Silver Spring Transit Center issue was about the post tension reinforcement in the cast in place concrete and how it was not done to designed specification buy the contractor that poured the concrete.

The Silver line Phase II issue is about the supplier of off site manufactured precast concrete panels not following the aggregate, porland and hydration specifications for the concrete mix use in the precast concrete panels.

Turns out I may not have been a bad as originally believed:

Tests: Silver Line concrete problem may not be as bad as feared
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Re: Major Concrete Issues Found in Silver Line Metro Extensi

Postby STrRedWolf » Sat Jul 21, 2018 6:41 am

Sand Box John wrote:STrRedWolf's comment should be place in a context of sarcasm.

The issues on each are totally different.

The Silver Spring Transit Center issue was about the post tension reinforcement in the cast in place concrete and how it was not done to designed specification buy the contractor that poured the concrete.


No sarcasm intended. I had not heard the final diagnosis of what the SSTC's concrete problems were, and barely remember the reporting; all I knew was it was a concrete problem.

(It's the old proverb: Advanced stupidity is indistinguishable from malice)
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