By National Research Council, Division on Engineering and Physical Sciences, National Materials Advisory Board, Commission on Engineering and Technical Systems, Committee on Nonconventional Concrete Technologies for Renewal of the Highway Infrastructure
Nonconventional Concrete applied sciences: Renewal of the street Infrastructure identifies study and improvement possibilities in leading edge, nonconventional fabrics and tactics that experience the capability to speed up the development technique, enhance the sturdiness of street pavement and bridges, and improve the serviceability and sturdiness of recent development below antagonistic conditions.
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ASSESSMENT OF CONVENTIONAL CONCRETE TECHNOLOGY This section summarizes the advantages and disadvantages of conventional concrete technologies. About this PDF file: This new digital representation of the original work has been recomposed from XML files created from the original paper book, not from the original typesetting files. Page breaks are true to the original; line lengths, word breaks, heading styles, and other typesetting-specific formatting, however, cannot be retained, and some typographic errors may have been accidentally inserted.
Techniques to enhance this process should be investigated. • Accelerators are used to increase the rate of hydration, particularly in cold climates. The most effective accelerator is CaCl2, but chlorides cause corrosion of the steel reinforcement. The use of CaCl2 is therefore severely limited and controlled. There has been considerable research in recent years to develop nonchloride accelerators that are effective without detrimental secondary effects. Another secondary effect of accelerators is that acceleration of the hydration reaction tends to result in a coarser porosity or a more open microstructure than in nonaccelerated concrete.
Such materials might be of use by releasing water in a controlled manner and thus regulating the temperature cycle and maintaining more constant hydrationreaction conditions, albeit at the expense of increasing the amount of water required for effective processing. They could also prevent water from draining out of forms and have a beneficial effect on the rheology and workability of concrete. Additionally, fibers used for these purposes might increase the strength of the cement during the sol-gel transition and, because they shrink when dry, help to prevent cracking by putting the material in a mildly compressive state.