Modeling of Thermal Effects During the Curing of Concrete Pavements PDF Download
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Author: Jeffrey Falkowsky
Publisher:
ISBN:
Category :
Languages : en
Pages : 110
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Author: Jeffrey Falkowsky
Publisher:
ISBN:
Category :
Languages : en
Pages : 110
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Book Description
Author: Wade H. Shafer
Publisher: Springer Science & Business Media
ISBN: 1461303931
Category : Science
Languages : en
Pages : 427
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Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS)* at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dis semination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volumes were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 39 (thesis year 1994) a total of 13,953 thesis titles from 21 Canadian and 159 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this impor tant annual reference work. While Volume 39 reports theses submitted in 1994, on occasion, certain uni versities do report theses submitted in previous years but not reported at the time.
Author: Muhammad Ehsanul Bari
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Understanding the early age behavior of concrete is an important issue in construction of concrete structures since different factors during construction, such as design consideration, material usage, and environmental influence, can alter the original configuration of the structure intended by the engineers and hence the structure may experience and exhibit undesired consequences. The primary interest of this research was to model the behavior of concrete under environmental excitations, such as the variation of temperature and relative humidity, during the early age after concrete placement. Experimental test results were obtained and mathematical models were developed for this research. Modeling the effect of curing process in response to the relative humidity variation was one of the main objectives of this research. A mathematical model for back-calculating the diffusion coefficient of cured concrete from experimental test was proposed. This back-calculated diffusion coefficient of concrete was indicative of the effectiveness of curing application provided during construction. Corner deflection model for predicting lift-off displacement and climatic stress model for predicting crack formations were formulated in order to predict the distress behavior of concrete for a given design and construction scenario. Probabilistic models for lift-off displacement and cracking were formulated to predict the probabilities of such distresses. Material properties, such as strength, elastic modulus, creep, drying shrinkage, were obtained from experimental program and were used as input in these distress prediction models. In order to assess the effectiveness of different curing compounds, two indices, such as curing index and overall curing index, were proposed. These indices were able to distinguish the difference in performance among different curing compounds. For validating the proposed corner lift-off displacement model and climatic stress model, numerical simulations were performed and the obtained results were compared with the field observations. The probabilistic models for predicting lift-off displacement and cracking behavior were validated by comparing the numerical simulation results with the field observations at Houston Intercontinental, TX. The predictions from these models were found to be in close agreement with the experimental observations. Furthermore, in order to assess the impact of a given design and construction, analytical study was performed with these models. In the sensitivity analysis, parameters of interest were the geometry of the structure, the effect of curing application, and the influence of time as well as the season of construction on the distress potentials. Numerical simulations indicated that the curing application was able to lower the early age distress potentials. The thicker slabs/overlays versus the thinner ones exhibited differences in performance in terms of distress potentials. The analytical study also revealed that it was possible to vary the distress potentials by varying the time as well as the season of construction. Finally, a constructability index was proposed in order to assist in decision making with regard to different designs and construction scenarios with a view to minimize the distress potentials in concrete structure. The results indicated that the constructability index was able to capture and demonstrate the effect of different parameters mentioned above on the constructability of rigid pavement/overlay projects. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/152618
Author: Per Just Andersen
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 118
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Book Description
This report describes the use of tables developed to help determine problems that may result from early thermal effects in concrete. The thermal behavior of concrete can be estimated from a knowledge of concrete temperature, air temperature, type of cement, and content of cement in the mixture. The thermal effects tables can be used to predict whether too high a temperature will be reached in the pavement; whether early thermal cracking will result from larger differences between the temperature of the concrete slab and the temperature of either the air or the base; or whether there is a risk of early cracking of the concrete. Examples of the use of the table are given along with guidelines for avoiding undesirable thermal effects.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 412
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Author: Eduardo M.R. Fairbairn
Publisher: Springer
ISBN: 3319766171
Category : Technology & Engineering
Languages : en
Pages : 432
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Book Description
This book provides a State of the Art Report (STAR) produced by RILEM Technical Committee 254-CMS ‘Thermal Cracking of Mas-sive Concrete Structures’. Several recent developments related to the old problem of understanding/predicting stresses originated from the evolution of the hydration of concrete are at the origin of the creation this technical committee. Having identified a lack in the organization of up-to-date scientific and technological knowledge about cracking induced by hydration heat effects, this STAR aims to provide both practitioners and scientists with a deep integrated overview of consolidated knowledge, together with recent developments on this subject.
Author: C. Petit
Publisher: RILEM Publications
ISBN: 9782912143471
Category : Pavements
Languages : en
Pages : 748
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Author:
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 682
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Book Description
Author: Dejian Shen
Publisher: Springer Nature
ISBN: 9811983984
Category : Technology & Engineering
Languages : en
Pages : 348
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Book Description
This monograph is written based on the author's research on the assessment, control, and repair of cracking of early-age concrete in the recent decade. The technique of internal curing for increasing cracking resistance of early-age concrete is further developed through experimental and theoretical research. It establishes models for predicting the internal relative humidity and autogenous shrinkage of internally cured concrete at early age; reveals the variation law and mechanism of early-age tensile creep of internally cured concrete; and explores the variation law and mechanism of early-age cracking resistance of internally cured concrete under continuous restrained condition or uniaxial restrained condition. It is designed as a reference work for professionals or practitioners and a textbook for undergraduates or postgraduates. As such, this book provides valuable knowledge, useful methods, and practical experience that can be considered in the field of concrete cracking control.
Author: Dan Ye
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Concrete curing has long been realized to be important to produce durable concrete. Curing compound is widely used to cure concrete in the field. The current curing membrane evaluation method ASTM C 156, however, is incapable of distinguishing the curing compound quality and guiding the curing practice in the field. A new laboratory curing membrane evaluation protocol is developed in this study. It has the ability to rank the quality of curing compound and guide curing practice in the field according to the field ambient weather conditions and the type of curing compound. A series of field tests were conducted to investigate the key factors that affect the curing effectiveness in the field conditions. A finite element program, temperature and moisture analysis for curing concrete (TMAC2), is updated to solve the coupled and nonlinear heat transfer and moisture transport problems in early-age concrete. Moisture capacity is induced into the TMAC2, which makes it unique to characterize the self-desiccation. A full scale concrete pavement test study was conducted at the FAA National Airport Pavement Test Facility (NAPTF) near Atlantic City, New Jersey. In this study, the material properties, i.e. thermal conductivity and moisture diffusivity, were backcalculated from field data. Thereafter, backcalculated material properties were used to forward-calculate the temperature and moisture histories of all other sections. High order shear deformable theory is used to model the concrete slab curling and warping behavior because of highly nonlinear temperature and moisture gradients. The maximum shear strain is obtained a couple of inches below the concrete slab. This might account for the occurrence of delamination.
