A Test Protocol for Evaluating Absorption of Joints in Concrete Pavements PDF Download
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Author: M. Tiznobaik
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 14
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Book Description
Premature deterioration at joint spresents a critical durability issue of concrete pavements associated with considerable repair costs. Durability of concrete exposed to aggressive environments depends mainly on the penetrability of its pore structure. Because absorption has been used as an important indicator for quantifying the durability of concrete, the aim of this study was to develop a customized test protocol for determining the absorption capacity of joints in concrete pavements. The study involved three phases with thorough statistical analyses of results. In Phase I, different absorption procedures were applied to laboratory specimens prepared with water-to-binder ratios (w/b) of 0.3, 0.5, and 0.6, representing variable qualities of concrete. The most efficient procedure was identified from Phase I and further verified in Phase II on concrete specimens prepared with a close range of w/b (0.35 and 0.40). In Phase III, the performance of the absorption protocol selected from the previous phases was assessed on cores extracted from recently constructed pavement sections in Winnipeg, Manitoba, Canada. To further complement and verify the trends obtained from the absorption protocol, mercury intrusion porosimetry tests were conducted on the field cores to capture the characteristics of the pore structure. The results indicated that the proposed absorption protocol was efficient, robust, and reliable in reflecting the physical features of the microstructure of field pavement sections, including joint locations.
Author: M. Tiznobaik
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 14
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Book Description
Premature deterioration at joint spresents a critical durability issue of concrete pavements associated with considerable repair costs. Durability of concrete exposed to aggressive environments depends mainly on the penetrability of its pore structure. Because absorption has been used as an important indicator for quantifying the durability of concrete, the aim of this study was to develop a customized test protocol for determining the absorption capacity of joints in concrete pavements. The study involved three phases with thorough statistical analyses of results. In Phase I, different absorption procedures were applied to laboratory specimens prepared with water-to-binder ratios (w/b) of 0.3, 0.5, and 0.6, representing variable qualities of concrete. The most efficient procedure was identified from Phase I and further verified in Phase II on concrete specimens prepared with a close range of w/b (0.35 and 0.40). In Phase III, the performance of the absorption protocol selected from the previous phases was assessed on cores extracted from recently constructed pavement sections in Winnipeg, Manitoba, Canada. To further complement and verify the trends obtained from the absorption protocol, mercury intrusion porosimetry tests were conducted on the field cores to capture the characteristics of the pore structure. The results indicated that the proposed absorption protocol was efficient, robust, and reliable in reflecting the physical features of the microstructure of field pavement sections, including joint locations.
Author: Mohammad Tiznobaik
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Optimum curing is essential in controlling durability performance of concrete. Absorption has been used as an indicator for quantifying the concrete durability, while the reliability of current absorption test methods with respect to curing efficiency and geometry of joints in concrete pavements is still unexplored. Curing efficiency of joints at early-age may be compromised due to uncontrolled evaporation resulting from saw-cutting processes. Therefore, providing an optimum curing and monitoring its efficiency with a real-time continuous measure is appealing. Also, a quantitative model of unsaturated flow ingress with respect to curing applications may provide a holistic understanding to predict the concrete durability. Therefore, this thesis aimed at assessing the effect of different curing compound applications on concrete pavements and overfilling joints with curing compound immediately after saw-cutting on improving the quality of concrete microstructure. Also, an effort was made to develop a customized test protocol for determining the absorption capacity of joints in concrete pavements. In addition, this thesis explored the correlation between the dielectric response of real-time sensor embedded in concrete with hydration development of paste as well as setting time. Moreover, this thesis investigated and developed an analytical model based on Katz-Thompson relationship to determine the absorption capacity of joints in concrete pavements according to an absorption test customized to the joint geometry of pavements. This thesis program involved experiments on laboratory specimens as well as cores extracted from field pavement and laboratory slabs. Absorption, rapid chloride penetrability, maturity, thermogravimetry, mercury intrusion porosimetry, and scanning electron microscopy tests were conducted. The results indicated applying a thorough coat and overfilling the joints with curing compound immediately after saw-cutting significantly improved concrete microstructure. Also, the proposed absorption protocol was efficient, robust and reliable in reflecting concrete microstructure of field pavement sections. Moreover, the dielectric response of concrete is strongly correlated to the hardening threshold and strength/hydration development of concrete, and thus it may be potentially used as a field indicator. Finally, the unsaturated flow model reliably simulated fluid transport at joint locations in concrete with accurate predictions relative to experimental results.
Author: Charnchai Siriwat
Publisher:
ISBN:
Category :
Languages : en
Pages : 236
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Book Description
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages :
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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 1408
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Book Description
Author: Alvin S. Nishikawa
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 130
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Book Description
Author:
Publisher:
ISBN:
Category : Testing
Languages : en
Pages : 260
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Book Description
Author:
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 364
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Book Description
Author: Andrew Wiese
Publisher:
ISBN: 9781622603664
Category :
Languages : en
Pages :
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Book Description
Concrete pavements represent a large portion of the transportation infrastructure. While the vast majority of concrete pavements provide excellent long-term performance, a portion of these pavements have recently shown premature joint deterioration. Substantial interest has developed in understanding why premature joint deterioration is being observed in jointed portland cement concrete pavements (PCCP). While some have attributed this damage to insufficient air void systems, poor mixture design, or chemical reaction between the salt and the paste, it is the hypothesis of this work that a component of this damage can be attributed to fluid absorption at the joints and chemical reactions between the salt and chemistry of the matrix. This paper discusses the role of soy methyl ester - polystyrene blends (SME-PS) as a potential method to extend the service life of concrete pavements by limiting the ingress of salt solutions. The report discusses field application of the SME-PS blends for field investigation in Lafayette and Fishers. Low temperature-differential scanning calorimetry (LT-DSC) techniques identified noticeable differences between plain mortar samples and mortar treated with SME-PS. The report also discusses the development of a test to assess chloride solution ingress during temperature cycling. The aim of this work is to provide background on some aspects that can lead to joint deterioration and provide early documentation showing that sealers may help to reduce the impact of deicers on joint damage, thereby extending the life of the concrete pavement. It should be noted that these sites as well as others are still ongoing and should be monitored for long term performance. Application procedure for SME-PS should follow manufacturer's recommendation.
Author:
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 212
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Book Description
The objective of this research was to develop guidelines to provide pavement engineers and field and laboratory personnel with a systematic procedure for the identification, evaluation, treatment, and prevention of materials-related distress in portland cement concrete pavements.
