Evaluation Of Portland Cement Concrete Coefficient Of Thermal Expansion Test Protocol And The Impact Of Cte On Performance Of Jointed Concrete Pavements
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Evaluation Of Portland Cement Concrete Coefficient Of Thermal Expansion Test Protocol And The Impact Of Cte On Performance Of Jointed Concrete Pavements
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Author : Shervin Jahangirnejad
language : en
Publisher:
Release Date : 2009
Evaluation Of Portland Cement Concrete Coefficient Of Thermal Expansion Test Protocol And The Impact Of Cte On Performance Of Jointed Concrete Pavements written by Shervin Jahangirnejad and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Aggregates (Building materials) categories.
Construction Materials And Structures
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Author : S.O. Ekolu
language : en
Publisher: IOS Press
Release Date : 2014-12-05
Construction Materials And Structures written by S.O. Ekolu and has been published by IOS Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-12-05 with Technology & Engineering categories.
The two volumes of these Proceedings contain about 200 conference papers and 10 keynote papers presented at the First International Conference on Construction Materials and Structures, held in Johannesburg, South Africa from 24 to 26 November 2014. It includes sections on Materials and characterization; Durability of construction materials; Structural implications, performance, service life; Sustainability, waste utilization, the environment; and Building science and construction.
Summary Report On The Evaluation Of Rigid Pavement Long Life Strategies
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Author : David Jones (Engineer)
language : en
Publisher:
Release Date : 2007
Summary Report On The Evaluation Of Rigid Pavement Long Life Strategies written by David Jones (Engineer) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Pavements, Concrete categories.
Aggregate Tests For Portland Cement Concrete Pavements
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Author : Amir Naoum Hanna
language : en
Publisher:
Release Date : 2003
Aggregate Tests For Portland Cement Concrete Pavements written by Amir Naoum Hanna and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Pavements, Concrete categories.
"This digest summarizes the findings from NCHRP Project 4-20C, 'Aggregate Tests Related to Performance of Portland cement concrete Pavements: State of the Knowledge.' It was prepared by Dr. Amir N. Hanna ... from the contractor's final report authored by Dr. Kevin J. Folliard and Mr. Kurt D. Smith ..."--Page 1
Effect Of Portland Cement Concrete Characteristics And Constituents On Thermal Expansion
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Author : Md Sarwar Siddiqui
language : en
Publisher:
Release Date : 2014
Effect Of Portland Cement Concrete Characteristics And Constituents On Thermal Expansion written by Md Sarwar Siddiqui and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
The coefficient of thermal expansion (CTE) is one of the major factors responsible for distresses in concrete pavements and structures. Continuously reinforced concrete pavements (CRCPs) in particular are highly susceptible to distresses caused by high CTE in concrete. CRCP is a popular choice across the U.S. and around the world for its long service life and minimal maintenance requirements. CRCP has been built in more than 35 states in the U.S., including Texas. In order to prevent CRCP distresses, the Texas Department of Transportation (TxDOT) has limited the CTE of CRCP concrete to a maximum of 5.5 x10-6 strain/oF (9.9 x10-6 strain/oC). Coarse aggregate sources that produce concrete with CTE higher than the allowable limit are no longer accepted in the TxDOT CRCP projects. Moreover, CTE is an important input in the Mechanistic-Empirical Pavement Design Guide (MEPDG). Small deviations in input CTE can affect the pavement thickness significantly in MEPDG designs. Therefore, accurate determination of concrete CTE is important, as it allows for enhanced concrete structure and pavement design as well as accurate screening of CRCP coarse aggregates. Moreover, optimizing the CTE of concrete according to a structure's needs can reduce that structure's cracking potential. This will result in significant savings in repair and rehabilitation costs and will improve the durability and longevity of concrete structures. This study found that the CTEs determined from saturated concrete samples were affected by the internal water pressure. As a result, the TxDOT method yielded higher values than did the American Association of State Highway and Transportation Officials (AASHTO) method. To further investigate the effect of internal water pressure, an analytical model was developed based on the poroelastic phenomenon of concrete. According to the model, porosity, permeability, and the rate of temperature change are the major factors that influence the internal water pressure development. Increasing the permeability of concrete can reduce the internal water pressure development and can thus improve the consistency of measured CTE values. Preconditioning concrete samples by subjecting them to several heating and cooling cycles prior to CTE testing and reducing the rate of temperature change improved the consistency of the CTE test results. Concrete CTE can be reduced by blending low-CTE aggregates with high-CTE aggregates and reducing the cement paste volume. Based on these findings, a concrete CTE optimization technique was developed that provides guidelines for the selection of concrete constituents to achieve target concrete CTE. A concrete proportioning technique was also developed to meet the need for CTE optimization. This concrete proportioning technique can use aggregate from any sources, irrespective of gradation, shape, and texture. The proposed technique has the potential to reduce the cement requirement without sacrificing performance and provides guidelines for multiple coarse and fine aggregate blends.
Effects Of Concrete Age On Coefficient Of Thermal Expansion Of Paving Mixes And Its Significance In Unbonded Overlay Design
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Author : Gauhar Sabih
language : en
Publisher:
Release Date : 2020
Effects Of Concrete Age On Coefficient Of Thermal Expansion Of Paving Mixes And Its Significance In Unbonded Overlay Design written by Gauhar Sabih and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Pavements, Asphalt categories.
With the advancement in rigid pavement design and advent of AASHTOWare Pavement Mechanistic-Empirical (ME) Design (American Association of State Highway and Transportation Officials, Washington, DC) as the latest design tool, increasing emphasis is being laid on the coefficient of thermal expansion (CTE) of concrete. The CTE affects the performance of rigid pavements in a significant manner, with a higher CTE corresponding to greater curling and resulting in greater pavement distresses. Prior research has conflicting views regarding CTE variation with age, and there has been very little to no research on the effects of CTE on the performance of unbonded concrete overlays (UBCOs). This study is performed to investigate the variation of CTE with concrete age through laboratory testing and further quantify the effects of CTE variation on UBCO design. To facilitate, four concrete paving mixes with different types of coarse aggregates and different mix properties from different districts of New Mexico were collected. The cast specimens from each of the mixes were tested for CTE as per the AASHTO T-336, Coefficient of Thermal Expansion of Hydraulic Cement Concrete , protocol, at the ages of 7, 14, 28, 60, 90, 120, and 180 days, respectively. The test results were analyzed, and it was observed that there is an increase in CTE over the range of 3.49 % to 9.77 %, between 28 days and 180 days. Further analysis was conducted with simulations in Pavement ME Design Version 2.3 ® that indicated a significantly deteriorated performance of the UBCO with increased CTE. The impact on transverse cracking and joint faulting is the most significant, with up to 13.3 % increase in cracking and up to 19.7 % increase in faulting distress. An unbonded overlay designed with 28 days CTE value may not perform for the design life because of the increase in CTE with age progression.
Quantifying Coefficient Of Thermal Expansion Values Of Typical Hydraulic Cement Concrete Paving Mixtures
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Author : Neeraj J. Buch
language : en
Publisher:
Release Date : 2008
Quantifying Coefficient Of Thermal Expansion Values Of Typical Hydraulic Cement Concrete Paving Mixtures written by Neeraj J. Buch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Aggregates (Building materials) categories.
A laboratory investigation was conducted to determine the coefficient of thermal expansion (CTE) of a typical Michigan Department of Transportation (MDOT) concrete paving mixture made with coarse aggregate from eight different sources. The primary aggregate class included limestone, dolomite, slag, gravel and trap rock. The CTE was determined using the provisional AASHTO TP60 protocol. Three replicate test specimens were fabricated for each mixture-age combination. Furthermore, the report also discusses the practical (significance) impact of the test variables on the transverse cracking performance of jointed plain concrete pavements.
Coefficient Of Thermal Expansion Of Portland Cement Concrete In Utah And Pavement Performance
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Author : Michael Thomas Rigby
language : en
Publisher:
Release Date : 2010
Coefficient Of Thermal Expansion Of Portland Cement Concrete In Utah And Pavement Performance written by Michael Thomas Rigby and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Concrete categories.
Task 6
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Author : Kejin Wang
language : en
Publisher:
Release Date : 2008
Task 6 written by Kejin Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Concrete categories.
The present research project was designed to determine thermal properties, such as coefficient of thermal expansion (CTE) and thermal conductivity, of Iowa concrete pavement materials. These properties are required as input values by the Mechanistic-Empirical Pavement Design Guide (MEPDG). In this project, a literature review was conducted to determine the factors that affect thermal properties of concrete and the existing prediction equations for CTE and thermal conductivity of concrete. CTE tests were performed on various lab and field samples of portland cement concrete (PCC) at the Iowa Department of Transportation and Iowa State University. The variations due to the test procedure, the equipment used, and the consistency of field batch materials were evaluated. The test results showed that the CTE variations due to test procedure and batch consistency were less than 5%. Concrete CTE values were significantly affected by different types of coarse aggregate. The CTE values of Iowa concrete made with limestone+gravel, quartzite, dolomite, limestone+dolomite, and limestone were 7.27, 6.86, 6.68, 5.83, and 5.69 microstrain/degree F (13.08, 12.35, 12.03, 10.50, and 10.25 microstrain/degree C), respectively, which were all higher than the default value of 5.50 microstrain/degree F in the MEPDG program. The thermal conductivity of a typical Iowa PCC mix and an asphalt cement concrete (ACC) mix (both with limestone as coarse aggregate) were tested at Concrete Technology Laboratory in Skokie, Illinois. The thermal conductivity was 0.77 Btu/hr ft degree F (1.33 W/m K) for PCC and 1.21 Btu/hr ft degree F (2.09 W/m K) for ACC, which are different from the default values (1.25 Btu/hr ft degree F or 2.16 W/m K for PCC and 0.067 Btu/hr ft degree F or 1.16 W/m K for ACC) in the MEPDG program. The investigations onto the CTE of ACC and the effects of concrete materials (such as cementitious material and aggregate types) and mix proportions on concrete thermal conductivity are recommended to be considered in future studies.
Measurement And Evaluation Of Asphalt Concrete Thermal Expansion And Contraction
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Author : Qinwu Xu
language : en
Publisher:
Release Date : 2008
Measurement And Evaluation Of Asphalt Concrete Thermal Expansion And Contraction written by Qinwu Xu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Asphalt concrete categories.
Thermal expansion and contraction (TE/TC) of asphalt concrete (AC) play a significant role in both the thermal fatigue and low-temperature cracking of AC pavements. This paper discusses a test method and procedure developed to determine the AC coefficients of thermal expansion and contraction (CTE and CTC, respectively). Cylindrical specimens were subjected to temperature variations in an environmental chamber and specimen deformations were measured using extensometers. Temperature was applied in the range of -5°C to 40°C during both expansion and contraction phases. A specimen made from ceramic with very low CTE/CTC was also tested so that the influence of the self TE/TC of extensometers could be accounted for, and therefore, the measured deformation of an AC specimen was properly adjusted. A finite element (FE) model was developed to simulate the thermal stresses and strains inside the specimen, and to provide means for reliable computation of CTE/CTC. For this FE model, required AC viscoelastic properties were determined from the dynamic modulus test. The CTE/CTC of AC were then determined by using the calibrated deformation-temperature relationship. The standard aluminum and rubber specimens were also tested for TE/TC within a temperature range to validate the developed test method and computation approach. It was found that the CTE/CTC of AC were nonlinear and temperature dependent. The CTE/CTC determined for the aluminum and rubber specimens were found to be close to the standard values, therefore, validating the proposed approach for determination of CTE/CTC of AC.