Early-Age Temperature Development in Concrete Pavements Containing Microencapsulated Phase Change Materials PDF Download
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Author: ZHENYU SHE
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
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Book Description
This study investigates experimentally and numerically the addition of microencapsulated phase change materials (PCMs) into concrete pavements at early ages to limit (i) temperature rise caused by cement-water hydration, (ii) cooldown rate, and (iii) the associated risk of thermal cracking. First, the effect of water-reducing admixture (WRA) on the heat generation rate from cement hydration was quantified using isothermal calorimetry. Second, large cubic PCM-mortar composite specimens representative of a common pavement geometry were prepared and placed in an environmental test chamber simulating realistic diurnal conditions. The results showed that the presence of PCM can reduce considerably the temperature rise and cooldown rate across the cementitious composite section within the first 24 hours following placement provided the PCM melting temperature is selected carefully. This was in spite of the fact that the lower thermal conductivity of PCM-composites inhibited heat dissipation. A transient 1D thermal model of pavement section was developed to simulate the temperature evolution and the rate of change in temperature within PCM-mortar composite sections. Good agreement was found between model predictions and experimental measurements. In addition, a parametric study was carried out to assess the effects of the PCM melting characteristics (temperature, temperature window, latent heat) on local temperature in PCM-mortar composites. The constitutive relationships and the numerical model developed as part of this study can be used to inform the design of concrete pavements containing PCMs for early-age crack resistance.
Author: ZHENYU SHE
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
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Book Description
This study investigates experimentally and numerically the addition of microencapsulated phase change materials (PCMs) into concrete pavements at early ages to limit (i) temperature rise caused by cement-water hydration, (ii) cooldown rate, and (iii) the associated risk of thermal cracking. First, the effect of water-reducing admixture (WRA) on the heat generation rate from cement hydration was quantified using isothermal calorimetry. Second, large cubic PCM-mortar composite specimens representative of a common pavement geometry were prepared and placed in an environmental test chamber simulating realistic diurnal conditions. The results showed that the presence of PCM can reduce considerably the temperature rise and cooldown rate across the cementitious composite section within the first 24 hours following placement provided the PCM melting temperature is selected carefully. This was in spite of the fact that the lower thermal conductivity of PCM-composites inhibited heat dissipation. A transient 1D thermal model of pavement section was developed to simulate the temperature evolution and the rate of change in temperature within PCM-mortar composite sections. Good agreement was found between model predictions and experimental measurements. In addition, a parametric study was carried out to assess the effects of the PCM melting characteristics (temperature, temperature window, latent heat) on local temperature in PCM-mortar composites. The constitutive relationships and the numerical model developed as part of this study can be used to inform the design of concrete pavements containing PCMs for early-age crack resistance.
Author: Cesare Sangiorgi
Publisher: MDPI
ISBN: 3038973521
Category : Electronic books
Languages : en
Pages : 213
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Book Description
This book is a printed edition of the Special Issue "Recent Advances in Smart Materials for the Built Environment" that was published in Materials
![Temperature Changes and Thermal Cracking in Concrete Pavements at Early Statees [by] J.G. Hunt PDF](https://books.google.com/books/content/images/frontcover/rWsOHAAACAAJ?fife=w80-h100)
Author: J. G. Hunt
Publisher:
ISBN: 9780721008226
Category : Pavements, Concrete
Languages : en
Pages : 24
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Book Description
Author: H.K. Sharma
Publisher: Allied Publishers
ISBN: 939095164X
Category : Business & Economics
Languages : en
Pages : 382
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Book Description
Sustainable development of smart cities infrastructures is of paramount importance and need to be planned, designed, constructed, operated and de-commissioned in a manner that ensures economic, social, environmental and institutional sustainability over the entire infrastructure life cycle. Smart cities infrastructure however be cost effective, disaster resilient, environmentally friendly, conserving natural resources, and sustainable ensuring faster delivery of quality and durable structures which include roads, building, bridges, energy and water infrastructures. Government of India is going to encourage Public Private Partnership (PPP) as an alternate option to build most of the infrastructures, which can be useful both for green-field as well as brown-field smart cities projects. The present book is a collection of contributed research and review papers presented at the ‘National Conference on Sustainable Development of Smart Cities Infrastructure’ (SDSCI-2023) held at National Institute of Technology, Kurukshetra in May 2023.The subject matter is grouped into nine sessions which include research articles pertaining to sustainable development of smart cities, urban and rural planning, transportation, built environment and management, sustainable and smart technologies, materials, construction and maintenance, advance modelling, characterization of structures, energy and environment, performance of smart cities infrastructure under extreme loading conditions, green buildings, structural health monitoring, and ICT in smart cities, data mining and machine learning for sustainable infrastructure, GIS and remote sensing, future trends and prospects of smart cities, innovative technologies, building energy and efficiency and sobriety, and sustainable resilience to natural and man-made disasters, and smart materials, etc. The book would be a valuable reference for researchers, students, structural designers, site engineers, and all related engineers involved in the field of sustainable development of smart cities infrastructure.
Author: Ting Tsui
Publisher: MDPI
ISBN: 3038427497
Category : Technology & Engineering
Languages : en
Pages : 237
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Book Description
This book is a printed edition of the Special Issue "Advanced Nanoindentation in Materials" that was published in Materials
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Steven H. Kosmatka
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 224
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Book Description
Portland Cement Association reference, dealing with fundamentals, cold weather concreting, curing, admixtures, aggregates, mixing, and much more.
Author: Herbert Pöllmann
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110473720
Category : Science
Languages : en
Pages : 518
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Book Description
Aside from water the materials which are used by mankind in highest quantities arecementitious materials and concrete. This book shows how the quality of the technical product depends on mineral phases and their reactions during the hydration and strengthening process. Additives and admixtures infl uence the course of hydration and the properties. Options of reducing the CO2-production in cementitious materials are presented and numerous examples of unhydrous and hydrous phases and their formation conditions are discussed. This editorial work consists of four parts including cement composition and hydration, Special cement and binder mineral phases, Cementitious and binder materials, and Measurement and properties. Every part contains different contributions and covers a broad range within the area. Contents Part I: Cement composition and hydration Diffraction and crystallography applied to anhydrous cements Diffraction and crystallography applied to hydrating cements Synthesis of highly reactive pure cement phases Thermodynamic modelling of cement hydration: Portland cements – blended cements – calcium sulfoaluminate cements Part II: Special cement and binder mineral phases Role of hydrotalcite-type layered double hydroxides in delayed pozzolanic reactions and their bearing on mortar dating Setting control of CAC by substituted acetic acids and crystal structures of their calcium salts Crystallography and crystal chemistry of AFm phases related to cement chemistry Part III: Cementitious and binder materials Chemistry, design and application of hybrid alkali activated binders Binding materials based on calcium sulphates Magnesia building material (Sorel cement) – from basics to application New CO2-reduced cementitious systems Composition and properties of ternary binders Part IV: Measurement and properties Characterization of microstructural properties of Portland cements by analytical scanning electron microscopy Correlating XRD data with technological properties No cement production without refractories
Author: Fernando Pacheco-Torgal
Publisher: Woodhead Publishing
ISBN: 0128189827
Category : Technology & Engineering
Languages : en
Pages : 422
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Book Description
Eco-efficient Pavement Construction Materials acquaints engineers with research findings on new eco-efficient pavement materials and how they can be incorporated into future pavements. Divided into three distinctive parts, the book emphasizes current research topics such as pavements with recycled waste, pavements for climate change mitigation, self-healing pavements, and pavements with energy harvesting potential. Part One considers techniques for recycling, Part Two reviews the contribution of pavements for climate change mitigation, including cool pavements, the development of new coatings for high albedo targets, and the design of pervious pavements. Finally, Part Three focuses on self-healing pavements, addressing novel materials and design and performance. Finally, the book discusses the case of pavements with energy harvesting potential, addressing different technologies on this field. Offers a clear and concise lifecycle assessment of asphalt pavement recycling for greenhouse gas emission with temporal aspects Applies key research trends to green the pavement industry Includes techniques for recycling waste materials, the design of cool pavements, self-healing mechanisms, and key steps in energy harvesting
Author: P. O. Fanger
Publisher: McGraw-Hill Companies
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 250
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Book Description
