226 research outputs found
An early childhood investment with a high public return
No full textEarly childhood education ; Education - Economic aspects
Optimization of flowable concrete for structural design: Progress report of fib task group 8.8
No full textWith the tendency to apply concrete with a higher workability and the use of new concrete components more options are available to design concrete. New concrete types like self-compacting concrete (SCC), ultra-high performance fibre reinforced concrete (UHPFRC) and high performance fibre reinforced cementitious composite (HPFRCC) also require adopted mix designs and in case, a new engineering approach. Flowable concrete not only is an innovative material, but its application can lead to innovative structures, combinations of building materials and alternative and efficient production methods. fib Task Group 8.8 aims at facilitating the use of innovative flowable materials for the design of concrete structures and considers three aspects of flowable concrete for structural design: material properties, production effects and structural boundary conditions. The main objectives of this group of experts are to combine research findings with practical experience and to write a state of-the-art report and a recommendation on the structural design with flowable concrete. Areas of structural design where flowable concrete differs from traditional vibrated concrete have to be identified. This paper reports about the progress of fib TG 8.8 and discusses important aspects related to flowable concrete.Structural EngineeringCivil Engineering and Geoscience
Increasing science, technology, engineering, and mathematics skills using Project Lead the Way
No full textIncludes bibliographical references
Flowable fibre-reinforced concrete: Progress in understanding and development of design standards
No full textSignificant progress has been achieved during the past years in the understanding of the behaviour of fibres in flowable concrete clearly indicating the link between mix design, casting conditions and structural behaviour. With mix-designs deviating more or less from conventional vibrated concrete (CVC), constitutive laws and code provisions related to the structural behaviour, as established so far, might no longer be applicable. Transferring the research-garnered knowledge into design prescriptions is an effort made by fib Task Group 4.3. ModelCode 2010 has introduced the K-factor concept, a factor that takes into account fibre orientation to consistently identify the mechanical properties of the material to be employed for structural design. The current design approach is determining the highest K-factor of a structure by experimental testing to assure a safe design. Flow simulations can assist in the design and adequate test methods have been developed to assure the required quality level.
This paper compiles recent research findings with regard to the flow behaviour and the standardisation of flowable fibre-reinforced concrete, a concrete type with a very high potential for production efficiency and the development of innovative products and structural applications. The synergy between tailored mixture composition, structural design methodologies and effective manufacturing/casting processes at a high level of quality is a strong engineering need to remain competitive and to fully exploit the potential that this category of advanced cement-based materials has for the construction industry
Shear strengthening of prestressed concrete beams with UHPFRC – a numerical study
No full textAccepted Author ManuscriptConcrete Structure
A jobless expansion isn't all bad news
No full textEmployment (Economic theory) ; Federal Reserve District, 9th ; Forecasting
A dynamic economy means churning employment
No full textEconomic conditions ; Employment ; Federal Reserve District, 9th ; Regional economics
Farmers are growing an appreciating crop of land
No full textFarm real estate values have increased despite ag conditions.Agriculture ; Farms - Valuation ; Federal Reserve District, 9th
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