Improvements of Testing Procedures for Concrete Coefficient of Thermal Expansion

Won, Moon

doi:10.3141/1919-03

Cited by 35 publications

(17 citation statements)

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“…In this study, the rupture modulus, compressive modulus, and Poison ratio were also tested for the mixtures. Similar study has been conducted by several other agencies [21][22][23].…”

Section: Coefficient Of Thermal Expansion (Cte) For Portland Cement Csupporting

confidence: 71%

Mechanistic-empirical pavement design guide (MEPDG): a bird’s-eye view

et al. 2011

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Past editions of the American Association of State Highway and Transportation Officials (AASHTO) Guide for Design of Pavement Structures have served well for several decades; nevertheless, many serious limitations exist for their continued use as the nation's primary pavement design procedures. Researchers are now incorporating the latest advances in pavement design into the new Mechanistic-Empirical Pavement Design Guide (MEPDG), developed under the National Cooperative Highway Research Program (NCHRP) 1-37A project and adopted and published by AASHTO. The MEPDG procedure offers several dramatic improvements over the current pavement design guide and presents a new paradigm in the way pavement design is performed. However, MEPDG is substantially more complex than the AASHTO Design Guide by considering the input parameters that influence pavement performance, including traffic, climate, pavement structure and material properties, and applying the principles of engineering mechanics to predict critical pavement responses. It requires significantly more input from the designer. Some of the required data are either not tracked previously or are stored in locations not familiar to designers, and many data sets need to be preprocessed for use in the MEPDG. As a result, tremendous research work has been conducted and still more challenges need to be tackled both in federal and state levels for the full implementation of MEPDG. This paper, for the first time, provides a comprehensive bird's eye view for the MEPDG procedure, including the evolvement of the design methodology, an overview of the design philosophy and its components, the research conducted during the development, improvement, and implementation phases, and the challenges remained and future developments directions. It is anticipated that the efforts in this paper aid in enhancing the mechanistic-empirical based pavement design for future continuous improvement to keep up with changes in trucking, materials, construction, design concepts, computers, and so on.

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“…In this study, the rupture modulus, compressive modulus, and Poison ratio were also tested for the mixtures. Similar study has been conducted by several other agencies [21][22][23].…”

Section: Coefficient Of Thermal Expansion (Cte) For Portland Cement Csupporting

confidence: 71%

Mechanistic-empirical pavement design guide (MEPDG): a bird’s-eye view

et al. 2011

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“…The CTE is directly influenced by the aggregate type and aggregate volume [6,[11][12][13], as well as internal moisture conditions [14][15][16] and cement paste [17]. The CTE has shown not to be significantly impacted by water-to-cement ratio [17] and concrete age [14,18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Aggregate Mineralogy and Concrete Microstructure on Thermal Expansion and Strength Properties of Concrete

Kim

Nam

et al. 2017

Applied Sciences

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Aggregate type and mineralogy are critical factors that influence the engineering properties of concrete. Temperature variations result in internal volume changes could potentially cause a network of micro-cracks leading to a reduction in the concrete's compressive strength. The study specifically studied the effect of the type and mineralogy of fine and coarse aggregates in the normal strength concrete properties. As performance measures, the coefficient of thermal expansion (CTE) and compressive strength were tested with concrete specimens containing different types of fine aggregates (manufactured and natural sands) and coarse aggregates (dolomite and granite). Petrographic examinations were then performed to determine the mineralogical characteristics of the aggregate and to examine the aggregate and concrete microstructure. The test results indicate the concrete CTE increases with the silicon (Si) volume content in the aggregate. For the concrete specimens with higher CTE, the micro-crack density in the interfacial transition zone (ITZ) tended to be higher. The width of ITZ in one of the concrete specimens with a high CTE displayed the widest core ITZ (approx. 11 µm) while the concrete specimens with a low CTE showed the narrowest core ITZ (approx. 3.5 µm). This was attributed to early-age thermal cracking. Specimens with higher CTE are more susceptible to thermal stress.

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“…Several researchers have indicated that the CoTE of aggregate is the most influencing parameter on the coefficient of expansion of concrete (Jahangirnejad et al, 2009;Mallela et al, 2005;Naik et al, 2010Naik et al, , 2006Ndon and Bergeson, 1995;Olidis and Hein, 2004;Won, 2005). As opposed to single-lift concrete pavements, the use of high-CoTE aggregates in the bottom lift encapsulated by a low-CoTE aggregate in the top lift provides economic and sustainability advantages.…”

Section: Potential Advantages Of Two-lift Concrete Pavementmentioning

confidence: 99%

Two-lift concrete paving for sustainable pavements

Alqarni¹,

Fowler²

2019

Sustainable Construction Materials and Technologies (SCMT)

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Two-lift concrete pavement, sometimes referred to as composite pavement, is an innovative technique that involves placing a thinner portland concrete layer over a thicker portland concrete layer at a specified interval. A shortage of suitable aggregates for use in concrete pavements in some regions of the world has become a very serious concern for some organizations. Importing aggregates from faraway locations is neither economical nor practical/sustainable; therefore, the use of local materials is highly desirable. The strength of two-lift concrete pavement technology lies in being able to utilize any of the following for the bottom lift: locally available aggregates, manufactured sands, highcoefficient of thermal expansion (CoTE) aggregates, recycled concrete aggregates (RCA), fractionated reclaimed asphalt pavements (FRAP), lower cement content, or a higher amount of supplementary cementitious materials (SCMs). Some of these materials, however, may not be allowed to be used in single-lift concrete pavements due to issues related to polishing, durability, or strength gain. This paper gives a thorough overview of the historical background, potential environmental and sustainable advantages, and practical challenges related to two-lift pavement.

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Improvements of Testing Procedures for Concrete Coefficient of Thermal Expansion

Cited by 35 publications

References 0 publications

Mechanistic-empirical pavement design guide (MEPDG): a bird’s-eye view

Mechanistic-empirical pavement design guide (MEPDG): a bird’s-eye view

Effect of Aggregate Mineralogy and Concrete Microstructure on Thermal Expansion and Strength Properties of Concrete

Two-lift concrete paving for sustainable pavements

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