Halsey, Nebraska DOR
Transcript of Halsey, Nebraska DOR
OBJECTIVEThis investigation was to evaluate the performance of sealers to prevent moisture penetration into concrete as a preventive maintenance tool for ASR.
##
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
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)
Preliminary Forensic InvestigationAnalysis
1Baseline Chloride Ion Sample Collection by Drilling
2Sample Analysis by Chloride IonAASHTO T260 Test Method I
3
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
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
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
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.
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
Visual Beat Test Horizontal RILEM Tube Test
Sealer Penetration Test
Visual Shading of the Panel Joints
Visual Bead TestTest based on a visual assessment of water beading on a horizontal surface.
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
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
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
Rating based on the giving criteria
PERFORMANCE VALUE
Poor 0
Medium 1
High 2
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.
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.
Deep penetration into substrate No change in surface appearance High resistance to alkali attack by minimizing infiltration
Surface SealantsASR- PREVENTION & MITIGATION
CONCRETE MEDIAN BARRIER SEALERLET PROJECT:-WEST LIMITS - N. 27TH ST. IN LINCOLN
Surface SealantsASR- PREVENTION & MITIGATION
CONCRETE MEDIAN BARRIER SEALERLET PROJECT:-I-80/480/680 IN OMAHA IN COUNTY: DOUGLAS SARPY
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.
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