Effect Of Curing Temperature On The Initial Thermal Expansion Of Calcium Aluminate Cement
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Effect Of Curing Temperature On The Initial Thermal Expansion Of Calcium Aluminate Cement
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Author : Kenneth William Davido
language : en
Publisher:
Release Date : 1968
Effect Of Curing Temperature On The Initial Thermal Expansion Of Calcium Aluminate Cement written by Kenneth William Davido and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with categories.
Effect Of Curing Time And Temperature On The Differential Thermal Analysis Of Calcium Aluminate Cement
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Author : George I. Reini
language : en
Publisher:
Release Date : 1972
Effect Of Curing Time And Temperature On The Differential Thermal Analysis Of Calcium Aluminate Cement written by George I. Reini and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with categories.
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.
Cement And Concrete Chemistry
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Author : Wieslaw Kurdowski
language : en
Publisher: Springer Science & Business
Release Date : 2014-04-24
Cement And Concrete Chemistry written by Wieslaw Kurdowski and has been published by Springer Science & Business this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-04-24 with Science categories.
This monograph describes cement clinker formation. It covers multicomponent systems, clinker phase structures and their reactions with water, hydrate composition and structure, as well as their physical properties. The mineral additions to cement are described as are their influence on cement-paste properties. Special cements are also discussed. The microstructure of concrete is then presented, and special emphasis is given to the role of the interfacial transition zone, and the corrosion processes in the light of cement-phase composition, mineral additions and w/c ratio. The admixtures' role in modern concrete technology is described with an emphasis on superplasticizer chemistry and its cement-paste rheological modification mechanism. Cement with atypical properties, such as calcium aluminate, white, low energy and expansive cements are characterized. The last part of the book is devoted to special types of concrete such as self compacting and to reactive powders.
Effect Of Initial Curing Temperatures On The Compressive Strength And Durability Of Concrete
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Author :
language : en
Publisher:
Release Date : 1952
Effect Of Initial Curing Temperatures On The Compressive Strength And Durability Of Concrete written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1952 with categories.
Thermophysical Properties Research Literature Retrieval Guides 1900 1980
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Author : J. F. Chaney
language : en
Publisher: Springer
Release Date : 1982-04-30
Thermophysical Properties Research Literature Retrieval Guides 1900 1980 written by J. F. Chaney and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982-04-30 with Technology & Engineering categories.
Building Science Abstracts
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Author : Building Research Station (Great Britain)
language : en
Publisher:
Release Date : 1972
Building Science Abstracts written by Building Research Station (Great Britain) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Building 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.
Evaluation Of A Procedure For Determining The Converted Strength Of Calcium Aluminate Cement Concrete
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Author : Matthew P. Adams
language : en
Publisher:
Release Date : 2018
Evaluation Of A Procedure For Determining The Converted Strength Of Calcium Aluminate Cement Concrete written by Matthew P. Adams and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Betong categories.
There is renewed interest in North America for the use of calcium aluminate cement (CAC) in infrastructure repair because of its ability to gain strength rapidly even at low temperatures, the ability to customize its fresh workability, and its durability in adverse environments. Conversion of the hydration products of concrete where CAC is the only binder is a well-known phenomenon that is typically accompanied by strength loss, the rate and extent of which is dependent on the temperature history of the concrete, the w/cm, the cement content, and the concrete mixture design. An accelerated method of determining the converted strength of CAC concrete that is convenient for use in the field is presented. This test allows the samples to be cast in the field and left at ambient field temperatures for the first 24 hours; then the specimens are moved to the laboratory and placed in a water bath at 50°C to promote conversion. Robustness testing results are presented for the test method. The effects of the water to cement ratio, the initial (first 24 hours) curing temperature, the length of time before placing the specimens in the 50°C water bath, and the aggregate type are examined. The impact of the low replacement rates (up to 10 %) of finely ground limestone (FGLS) for CAC in concrete mixtures on converted concrete strengths was also studied. Results from testing showed that the majority of mixtures converted 48 hours after submersion in the 50°C water bath; however, differences in the initial curing temperature or aggregate type can delay conversion up to 11 days when specimens are cured following this procedure. Results also indicate that FGLS at replacement rates of 5 % and below in CAC systems may help increase the converted strength observed without reducing initial early strength gain.
Canmet Report 77
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Author : Dhh Quon
language : en
Publisher:
Release Date : 1977
Canmet Report 77 written by Dhh Quon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.