Halsey, Nebraska DOR

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Transcript of Halsey, Nebraska DOR

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OBJECTIVEThis investigation was to evaluate the performance of sealers to prevent moisture penetration into concrete as a preventive maintenance tool for ASR.

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Determine the effect of sealers in delaying ASR

Determine how long the sealers could provide protection in a heavy traffic surface

Evaluate and Test seven sealers in PCC Pavement

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Old Cheney Segment between 62nd and Frontier Rd

Old Cheney Rd

Frontier Rd

S 62nd S

t

North

(Lancaster County/City of Lincoln GIS Map, 2013)

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Preliminary Forensic InvestigationAnalysis

1Baseline Chloride Ion Sample Collection by Drilling

2Sample Analysis by Chloride IonAASHTO T260 Test Method I

3

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100% Silane solvent-based

40% silane solvent-based

Untreated

100% acrylic polymer

100% acrylic polymer

100% acrylic polymer

Untreated

Untreated

100% reactive waterborne silane-siloxane w/ high solids100% reactive waterborne silane-siloxane w/ high solidslPlus100% reactive waterborne silane-siloxane w/ high solidsUntreated

Untreated

100% reactive waterborne silane-siloxane100% reactive waterborne silane-siloxane100% reactive waterborne silane-siloxaneUntreated

40% silane solvent-based HZHZHZ40% silane solvent-based

Untreated

Untreated

40% Silane water based

40% Silane water based

40% Silane water based

40% Silane water based

Untreated

100% Silane solvent-based

100% Silane solvent-based

Untreated

UntreatedBlend of lithium and Silane/Siloxane

Blend of lithium and Silane/Siloxane

Untreated

Untreated

East

100% acrylic polymer

Frontier Rd

(Lancaster County/City of Lincoln GIS Map, 2013)

Layout of Experimental Sealer Test Sections

100% acrylic polymer

100% reactive waterborne Silane-siloxane w/ high solids

100% reactive waterborne Silane-siloxane

40% Silane solvent-based

100% Silane solvent-based

Blend of lithium and Silane/Siloxane

Untreated

40% Silane water based

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The results from the chloride ion analysis showed large datascatter on the first year test results, the research teamconsidered looking at the data trend to analyze data fieldcollection.

Added samples at depth increments of 0- ½”, ½”-1” and1”-1 ½” in the middle of the pavement for all testsections treated and untreated .

The strategy was to evaluate the effectiveness ofsealers away from the joint, since the joint allowsmoisture and chemicals to go through thepavement.

Four additional observations were also added to the field-testing for further information into the performance of thesealers. Visual Bead Test Horizontal RILEM Tube Test Sealer Penetration Test Shading of the Panel Joints

Total 420 samples / year

Presenter
Presentation Notes
The middle left and middle right were added to provide consistent results that are mainly effected by the penetration of the chloride ions through the surface sealer and not from the joint where there is a greater penetration of moisture and chemicals.
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Change Chloride Ion testing by automatic titrator according to NDR (AASHTO) T 260 Method III

Sealers Performance additional field observations Visual Bead Test Horizontal RILEM Tube Test Sealer Penetration Test Shading of the Panel Joints

Analysis

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Chloride Ion Analysis2012 thru 2014

2012 thru 2014 data Analysis was based by depth

420 Samples/yrfrom

Right & Left Joint (RT)& (LT)

Center Panel Left & Right (ML) & (MR)

The deviations in the samples from one data point to another data point

continue

Extreme Studentized Deviate

(ESD) testwas used to detect

outliers

Detected outliers within a 90 percent

confidence level

The analysis by the Extreme Studentized

Deviate shows samples taken at the RT and LT, presented more outliers than

the ML and MR

ML & MR were added to RT & LT provide consistentresults that are mainly effected by the penetration ofthe sealers to prevent chloride ions through thesurface and not from joint where there is a greaterpenetration of moisture and chemicals.

Presenter
Presentation Notes
This evaluation proves the sensitive nature of the test for AASTHO T 260
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100% Silane solvent-based

40% silane solvent-based

Untreated

100% acrylic polymer

100% acrylic polymer

100% acrylic polymer

Untreated

Untreated

100% reactive waterborne silane-siloxane w/ high solids100% reactive waterborne silane-siloxane w/ high solidslPlus100% reactive waterborne silane-siloxane w/ high solidsUntreated

Untreated

100% reactive waterborne silane-siloxane100% reactive waterborne silane-siloxane100% reactive waterborne silane-siloxaneUntreated

40% silane solvent-based HZHZHZ40% silane solvent-based

Untreated

Untreated

40% Silane water based

40% Silane water based

40% Silane water based

40% Silane water based

Untreated

100% Silane solvent-based

100% Silane solvent-based

Untreated

UntreatedBlend of lithium and Silane/Siloxane

Blend of lithium and Silane/Siloxane

Untreated

Untreated

East

100% acrylic polymer

Frontier Rd

(Lancaster County/City of Lincoln GIS Map, 2013)

Layout of Experimental Sealer Test Sections

100% acrylic polymer

100% reactive waterborne Silane-siloxane w/ high solids

100% reactive waterborne Silane-siloxane

40% Silane solvent-based

100% Silane solvent-based

Blend of lithium and Silane/Siloxane

Untreated

40% Silane water based

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Visual Beat Test Horizontal RILEM Tube Test

Sealer Penetration Test

Visual Shading of the Panel Joints

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Visual Bead TestTest based on a visual assessment of water beading on a horizontal surface.

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Horizontal RILEM Tube TestThe Horizontal RILEM Tube Test is a measurement of water absorption under low-pressure (pipe method). The absorption is measured by tracking the change of water volume by time intervals.

Leakage of the Measuring Fluid

Presenter
Presentation Notes
, was evaluated in 2012 to measure absorption of water on the pavement surface for informational purposes.
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Sealer PenetrationTest based on visual assessment of a core taken from each treated section. 2 x 2 inch cores were taken, split lengthwise, and the inner top surface saturated with distilled water.

Sealed SectionSealer Penetration Visible

2014

Sealed SectionSealer Penetration Not Visible

2014

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Visual Shading of the Panel JointsShading is an early sign of ASR. It was observed at the joints of the pavement in 2012 prompting future monitoring of the panels for this indication. Pictures were taken for the years 2012-2014 at the joints.

Shading of Panel Joint No Shading of Panel Joint

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Rating based on the giving criteria

PERFORMANCE VALUE

Poor 0

Medium 1

High 2

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Sealer Field Performance Summary Solvent-based products were found to have greater visible/measured

depths of penetration than water-based siloxane or lithium-based.

The depth of penetration of the solvent based was found to be 1/8 to ¼ inch compared to water-based, siloxane or lithium-based, which exhibited no penetration depth.

When comparing the laboratory testing and the field-testing performed in this study

– 100% and 40% Silane Solvent Based exhibited consistently good performance throughout all the tests and offered the best protection against chloride ion intrusion.

– 40% Water-Based Silane and Blend of Lithium and Silane/Siloxane exhibited intermediate performance.

– Waterborne Silane-Siloxane Based and the Acrylic Based Polymer exhibited lowest performance.

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Sealer Field Performance Summary The major finding during this study was the depth of penetration by

coring which resulted in a very effective tool for screening the sealers depth of penetration.

The results from the chloride ion analysis showed large scatter, which made it difficult to evaluate the performance from year to year. This study increased the testing by tripling the testing by depth and by sampling; this increased the time/cost and did not increase the consistency of the data.

Chloride ion content measurements proved inconclusive and a poor indicator of sealer performance. Water resistance in core observations were found to be consistent and indicative of sealer performance.

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Deep penetration into substrate No change in surface appearance High resistance to alkali attack by minimizing infiltration

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Surface SealantsASR- PREVENTION & MITIGATION

CONCRETE MEDIAN BARRIER SEALERLET PROJECT:-WEST LIMITS - N. 27TH ST. IN LINCOLN

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Surface SealantsASR- PREVENTION & MITIGATION

CONCRETE MEDIAN BARRIER SEALERLET PROJECT:-I-80/480/680 IN OMAHA IN COUNTY: DOUGLAS SARPY

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Material RequirementsThe concrete sealer shall be 100 percent Active Silane. The sealer shall meet the requirements of Bridge Penetrating Concrete Sealers on the Nebraska’s Approved Product List (APL).

Prior to Applications• The sealer shall be placed on concrete that has cured for a minimum of 28 days.• All surfaces shall be cleaned • Pressure water washer capable of delivering water at not less than 2,000 psi• Surfaces shall be allowed to air dry for a minimum of 48 hours.

ApplicationsHorizontal Application: Concrete Sealer shall be applied with low pressure sprayer (10 -25 psi) or roller so as to thoroughly saturate the concrete surface.

Vertical Application: Apply from bottom up with low pressure sprayer (10 - 25 psi) or roller so as to thoroughly saturate the concrete surface and create a uniform wet appearance.

Application Rates: Minimum rate is 350 sq. ft. per gallon. The concrete sealer shall be applied according to the manufacture recommended rate.

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Duration of sealers dry time Skid resistance if open to traffic early Re-application of solvent based sealers When you would reapply Would the reapplication have an effect reducing

the optimum penetration

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