Piloted Quality Control Techniques Using the Plastic Mold Compaction Device for Cement Stabilized Materials

Sullivan, W. Griffin; Howard, Isaac L.

doi:10.1520/acem20160075

Cited by 6 publications

(14 citation statements)

References 8 publications

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“…The PM Device is a metal mold which allows specimens to be compacted into an interior plastic mold with a Proctor hammer. There are two versions: one produces specimens 3 inches in diameter by 6 inches tall which has been documented ( 1 – 3 ); the other produces specimens 4 inches in diameter by 8 inches tall and was first used in the field on I-269. These two versions are denoted hereafter as PM3x6 and PM4x8, respectively.…”

Section: Investigation Of Lots a B And Cmentioning

confidence: 99%

“…First, this was a massive project where over 3 million yd 2 of soil was stabilized; projects of this nature can be all consuming, with those involved often not investing the time to document the project in case study form. Second, the Mississippi Department of Transportation (MDOT) is a heavy user of chemically stabilized soil, exampled by its average annual usage of roughly 30 million yd 2 of soil-cement, in addition to lime stabilization ( 1 ), and is considering changes to stabilization practices, so this project could be viewed as a baseline of sorts. Third, the plastic mold compaction device (PM Device) ( 2 , 3 ), is envisioned to be a key part of MDOT’s updated soil stabilization practices and it was utilized on-site during this project for assessment of current practices and to gain knowledge on how to incorporate protocols more fully into design and construction with this new specimen preparation and testing philosophy.…”

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confidence: 99%

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Case Study of Interstate 269 Corridor through Mississippi Focusing on Chemically Stabilized Pavement Layers

Sullivan

Howard

2019

Transportation Research Record

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The Mississippi corridor of Interstate 269 (I-269) is located in northwest Mississippi and construction of this corridor encompassed approximately 27 miles of new Interstate. This study documents I-269 as a case study of the chemically stabilized soil pavement layers. The evaluation comprises pre-construction activities (material selection, mixture design, pavement design, contract information), construction activities (processes, specifications, as-built quality), and an assessment of three cement stabilized base sections. Detailed assessment included on-site specimen preparation using the plastic mold compaction device (PM Device), core drilling, and subsequent laboratory testing for density, unconfined compressive strength, and elastic modulus. This project was able to document and quantify density variability within current Proctor and nuclear gauge practices to the point where there was noticeable agency and contractor risk. Variability is known to exist in large construction projects, but quantifiable measurements over a large project, as presented in this paper, are more valuable than general expectations for basing future decisions. This paper provides evidence that a construction quality control program where nuclear gauge and Proctor compaction practices are interconnected with mechanical property measurements taken on specimens fabricated with the PM Device is worth considering for implementation. The PM Device fared well for construction, mixture design, and pavement design activities when benchmarked relative to the density, strength, and modulus of the several dozen cores taken and assessed from I-269.

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Section: Investigation Of Lots a B And Cmentioning

confidence: 99%

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confidence: 99%

Case Study of Interstate 269 Corridor through Mississippi Focusing on Chemically Stabilized Pavement Layers

Sullivan

Howard

2019

Transportation Research Record

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“…UCS ranges reported for Groups 1, 2, and 3 were comparable to UCS ranges reported for other MDOT field projects where the PM device was successfully implemented. Average UCS ranges of 261 psi on Interstate 269, 116 psi on U.S. Highway 84, 308 psi on State Route 9, and 257 psi on State Route 475 ( 21 – 23 ). These ranges are comparable to UCS ranges seen in Table 4, indicating the PM device produced similar UCS variability in FDR material as it did with cementitiously stabilized fine-grained soils.…”

Section: Resultsmentioning

confidence: 99%

“…drop). The most unique aspect of the PM device is its ability to interface design processes (i.e., pavement layer thickness design and laboratory mixture design) with field construction activities (i.e., QC/QA testing) ( 20 , 21 ). Figure 1 b shows a photo of a 4 × 8 in.…”

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confidence: 99%

Demonstrating Field Use of the Plastic Mold Device on Full-Depth Reclamation Projects in Mississippi

Carey¹,

Sullivan²,

Ayers

et al. 2023

Transportation Research Record: Journal of the Transportation R

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This paper documents the use of the 4 x 8 in. plastic mold (PM) device on two full-depth reclamation (FDR) field projects where cement-stabilized material containing large aggregates were used. PM device specimens were assessed to understand project variability as well as investigate potential in-field curing protocols for early-age roadway trafficability. Additionally, PM device specimens were compared with cores to quantify early-age mechanical properties and relationships. The density of PM device specimens and cores were, on average, within 2% of one another. In some cases, on-site curing protocols produced strengths that were not statistically different from cores. Ultimately, the PM device was successfully implemented and capable of producing reliable and repeatable results that captured project variability.

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“…Over the last 15 years, MDOT has funded several soilcement studies focusing on design, construction, and performance (17)(18)(19)(20)(21)(22)(23)(24). George (17) conducted full-scale field trials to examine reflective cracking and overall field performance of cement treated base pavement layers.…”

Section: Literature and Practice Reviewmentioning

confidence: 99%

Time Delay Effects on Compactability of Soil-Cement Materials during Proctor Testing

Sullivan

Howard

2021

Transportation Research Record

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The Proctor test method, as specified in AASHTO T134 and ASTM D558, continues to play a vital role in design and construction quality control for soil-cement materials. However, neither test method establishes a methodology or standardized protocols to characterize the effects of time delay between cement addition and compaction, also known as compaction delay. Compaction delay has been well documented to have a notably negative effect on compactability, compressive strength, and overall performance of soil-cement materials, but specification tools to address this behavior are not prevalent. This paper aims to demonstrate the extent of compaction delay effects on several soil-cement mixtures used in Mississippi and to present recommended new test method protocols for AASHTO T134 to characterize compaction delay effects. Data presented showed that not all soil-cement mixtures are sensitive to compaction delay, but some mixtures can be very sensitive and lead to a meaningful decrease in specimen dry density. Recommended test method protocols were presented for AASHTO T134 and commentary was presented to provide state Departments of Transportation and other specifying agencies a few examples of how the new compaction delay protocols could be implemented.

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Piloted Quality Control Techniques Using the Plastic Mold Compaction Device for Cement Stabilized Materials

Cited by 6 publications

References 8 publications

Case Study of Interstate 269 Corridor through Mississippi Focusing on Chemically Stabilized Pavement Layers

Case Study of Interstate 269 Corridor through Mississippi Focusing on Chemically Stabilized Pavement Layers

Demonstrating Field Use of the Plastic Mold Device on Full-Depth Reclamation Projects in Mississippi

Time Delay Effects on Compactability of Soil-Cement Materials during Proctor Testing

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