Hydration And Dimensional Stability Of Calcium Aluminate Cement Based Systems
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Hydration And Dimensional Stability Of Calcium Aluminate Cement Based Systems
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Author : Julien Bizzozero
language : en
Publisher:
Release Date : 2014
Hydration And Dimensional Stability Of Calcium Aluminate Cement Based Systems written by Julien Bizzozero 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.
Factors Influencing Conversion And Volume Stability In Calcium Aluminate Cement Systems
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Author : Matthew Peter Adams
language : en
Publisher:
Release Date : 2015
Factors Influencing Conversion And Volume Stability In Calcium Aluminate Cement Systems written by Matthew Peter Adams and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Alumina cement categories.
There is renewed interest in North America for the use of calcium aluminate cement (CAC) in infrastructure repair. The interest is driven by the specialty properties that make CAC the ideal candidate for particular applications. These include rapid strength gain, even at temperatures approaching 0°C, the ability to customize fresh property characteristics, high abrasion resistance, and resistance to chemical corrosion. Despite the advantages that CAC can bring to infrastructure repair projects, it is still not well understood within the North American construction community. There are three main topics that are limiting the use of CAC in the construction industry today: (1) a general lack-of-understanding within the construction industry of the conversion process that occurs in CAC systems; (2) there is no standardized accelerated test method for determining the minimum converted strength of CAC concrete; and (3) there are insufficient data on the long-term performance of concrete made with CAC, particularly as a repair material in transportation infrastructure. The work presented in this dissertation addresses these topics in an effort to provide information for and tools for construction professionals interested in using CAC in infrastructure repair situations. Conversion of the hydration products of concrete where CAC is the only binder is a well-known phenomenon which is accompanied by the formation of porosity and strength loss. Presented in this dissertation is an accelerated test method for determining the converted strength of CAC concrete that is convenient for use in the field. Robustness of this test method is examined. The effects of water to cement materials ratio (w/cm), curing temperature during initial 24 hours after casting, length of time prior to being placed in 50°C water bath, and aggregate source are examined. Results indicated that the test method is viable for use in the field, however writing of a standard based on this method will require careful consideration to take into account impact of temperature impact and aggregate source on time to conversion. Variability of the test method between four laboratories was also examined and showed that variability within CAC systems is higher when compared to ordinary portland cement (OPC) systems. Also presented is a study of the impact of replacing CAC with finely ground limestone (FGLS) at rates of 1%, 2%, 5%, and 10%. These results showed that replacement rates up to 5% can significantly improve the converted strength of CAC concrete without impacting rapid strength gain prior to conversion. A further examination of the impact of aggregate type on hydration, conversion, and strength development in CAC systems is also presented. Concrete systems made with nine different coarse aggregate sources and six different fine aggregate sources were cast. Carbonate limestone aggregate systems experienced delayed times to conversion and experienced less strength reduction due to conversion compared to siliceous limestone and siliceous river gravel aggregates. Further examination was done to study the pore solution chemistry, porosity, and microstructure of one carbonate limestone and one siliceous river gravel system. These results indicated that the siliceous river gravel system had lower ionic activity within its pore solution at all ages, and had significantly lower pH compared to the carbonate limestone system. Additionally, the siliceous river gravel system formed poor interfacial transition zones and had higher overall porosity compared to the carbonate limestone system. Theories explaining the differences between these two systems are presented. Finally, an examination of volume stability of CAC systems compared to calcium sulfoaluminate cement (CSA) and OPC systems is presented. Systems based on CAC experienced the highest levels of chemical, autogenous, and drying shrinkage. It was found that the rapid setting nature of CAC and CSA systems caused the pore structures to develop quickly resulting in an increase in the rate of early age shrinkage compared to the OPC system. Additionally, the impact of length of curing on drying shrinkage was examined for CSA and CAC systems. Results showed that length of curing did not impact overall drying shrinkage in either system.
A Practical Guide To Microstructural Analysis Of Cementitious Materials
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Author : Karen Scrivener
language : en
Publisher: CRC Press
Release Date : 2018-10-09
A Practical Guide To Microstructural Analysis Of Cementitious Materials written by Karen Scrivener and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-09 with Technology & Engineering categories.
A Practical Guide from Top-Level Industry Scientists As advanced teaching and training in the development of cementitious materials increase, the need has emerged for an up-to-date practical guide to the field suitable for graduate students and junior and general practitioners. Get the Best Use of Different Techniques and Interpretations of the Results This edited volume provides the cement science community with a state-of-the-art overview of analytical techniques used in cement chemistry to study the hydration and microstructure of cements. Each chapter focuses on a specific technique, not only describing the basic principles behind the technique, but also providing essential, practical details on its application to the study of cement hydration. Each chapter sets out present best practice, and draws attention to the limitations and potential experimental pitfalls of the technique. Databases that supply examples and that support the analysis and interpretation of the experimental results strengthen a very valuable ready reference. Utilizing the day-to-day experience of practical experts in the field, this book: Covers sample preparation issues Discusses commonly used techniques for identifying and quantifying the phases making up cementitious materials (X-ray diffraction and thermogravimetric analysis) Presents good practice oncalorimetry and chemical shrinkage methods for studying cement hydration kinetics Examines two different applications of nuclear magnetic resonance (solid state NMR and proton relaxometry) Takes a look at electron microscopy, the preeminent microstructural characterization technique for cementitious materials Explains how to use and interpret mercury intrusion porosimetry Details techniques for powder characterization of cementitious materials Outlines the practical application of phase diagrams for hydrated cements Avoid common pitfalls by using A Practical Guide to Microstructural Analysis of Cementitious Materials. A one-of-a-kind reference providing the do’s and don’ts of cement chemistry, the book presents the latest research and development of characterisation techniques for cementitious materials, and serves as an invaluable resource for practicing professionals specializing in cement and concrete materials and other areas of cement and concrete technology.
Microstructural Development Of Calcium Aluminate Cement Based Systems With And Without Supplementary Cementitious Materials
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Author : Christophe Gosselin
language : en
Publisher:
Release Date : 2009
Microstructural Development Of Calcium Aluminate Cement Based Systems With And Without Supplementary Cementitious Materials written by Christophe Gosselin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Calcium Aluminates
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Author : Charles Fentiman
language : en
Publisher: Bre Press
Release Date : 2014-05-16
Calcium Aluminates written by Charles Fentiman and has been published by Bre Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-05-16 with Technology & Engineering categories.
The first industrial process for the production of a cement based on calcium aluminates was patented in 1908 and since then these cements have become hugely important for a wide range of applications. This volume presents the proceedings of the international conference held in Avignon, France, in May 2014, close to the site of the invention. The papers come from Europe, North America, the Far East, the Middle East and South Africa and demonstrate a strong continuing interest, and real progression, in the knowledge and understanding of this important class of cement, demonstrating that CAs are well placed to continue extending their field of applications for, hopefully, the next hundred years. New developments and applications covered in the 60 papers include offshore applications, encapsulation, wastewater treatment, self-levelling flooring, refractory applications and biogenics. Various studies also demonstrate the increasing importance of CAs in formulations, with much interest in blended systems, and especially the ternary system with calcium sulfate and Portland cement. In addition, strong contributions relate to the phase systems, CA types, hydration, mechanical properties and durability.
Calcium Aluminate Cements
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Author : R.J. Mangabhai
language : en
Publisher: CRC Press
Release Date : 1990-07-05
Calcium Aluminate Cements written by R.J. Mangabhai and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990-07-05 with Architecture categories.
The special properties of calcium aluminate cements make them of value in the construction, mining and refractory industries. This book brings together new international research information on their performance. As well as a state-of-the-art review, it includes reports on studies of: mineralogy, hydration and microstructure; rheology of pastes, mo
Early Age Behavior Of Calcium Aluminate Cement Systems
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Author : Jason H. Ideker
language : en
Publisher:
Release Date : 2008
Early Age Behavior Of Calcium Aluminate Cement Systems written by Jason H. Ideker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Calcium aluminate categories.
Compared to the knowledge base for ordinary portland cement concrete (OPCC), relatively little information exists for calcium aluminate cement concrete (CACC), despite its existence for over 100 years. There is particularly a lack of knowledge related to early-age behavior of CACC, specifically volume change and cracking potential. To assess these early-age properties, two unique pieces of equipment were developed and employed: a rigid cracking frame and free deformation frame which enabled quantification of restrained stress generation and unrestrained autogenous deformation, respectively. These two pieces of equipment employed active temperature control and allowed a wide range of isothermal and realistic temperature conditions to be imposed upon hydrating cementitious samples. Match-cured samples (i.e. identical temperature curing to that in the frames) enabled the quantification of mechanical property development. Samples cured at discrete isothermal temperatures up to 30 °C developed tensile forces in the rigid cracking frame and exhibited shrinkage phenomena in the free deformation frame. At temperatures above 30 °C, the converse was true and significant compressive forces developed in restrained testing and expansion was observed in unrestrained testing. It was found that this was a direct result of microstructural development related to the formation of metastable phases (associated with shrinkage) and stable phases (expansion as a result of conversion from metastable to stable phases). Proper use of this material must take into account behavior associated with both types of hydrate assemblages, metastable and stable. Realistic time-temperature histories were also investigated based on field-scale concrete cast as part of this research project. It was found that volume change at earlyage was dominantly controlled by thermal history. Furthermore, it was not simply the maximum temperature reached, but the rate of temperature rise during hydration and the resulting duration of time spent at high temperature that profoundly influenced volume change and property development. The research described in this dissertation represents a significant advancement of the state-of-knowledge of this unique material and has further elucidated the role of temperature during hydration of CACC.
Strontium Aluminate
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Author : Petr Ptáček
language : en
Publisher: BoD – Books on Demand
Release Date : 2014-07-02
Strontium Aluminate written by Petr Ptáček and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-07-02 with Technology & Engineering categories.
Strontium aluminate cement is special inorganic cement with the properties which make it favorable for various special applications such as refractory products, macro defect free (MDF) composites, blended cements and expansive cements for high temperature applications. There is an immense number of possible combinations which can be made to prepare blended and multicomponent cements and to investigate the influence of substitutions on the properties of strontium aluminate. Divided into ten sections, this book provides the latest research achievements in many aspects of this binder. The manufacturing, the hydration process, the setting behavior and the properties are described. The book contains many original and firstly published experimental research results obtained during writing. Currently there is no comprehensive work on this topic in literature. From this point of view, the book is a pilot work on this topic and should attract the attention of researchers and bring further progress of this topic.
Hydration Microstructural Development And Dimensional Stability Of Cementitious Materials Made Of Portland Cement Clinker And Fluoroanhydrite
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Author : Carolina Prieto Gómez
language : en
Publisher:
Release Date : 2010
Hydration Microstructural Development And Dimensional Stability Of Cementitious Materials Made Of Portland Cement Clinker And Fluoroanhydrite written by Carolina Prieto Gómez and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Hydration And Setting Of Cements
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Author : J. C. Mutin
language : en
Publisher: Spon Press
Release Date : 1992
Hydration And Setting Of Cements written by J. C. Mutin and has been published by Spon Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Technology & Engineering categories.
Rapid advances in understanding the complex behaviour of cement-based systems are being made by researchers in many countries. This volume offers a series of contributions from those working with cement, with applications in long-term nuclear-waste storage and in construction materials.