Use Of Permeable Formwork In Placing And Curing Concrete
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Use of Permeable Formwork in Placing and Curing Concrete
Permeable framework is a special class of lined formwork used to produce improvements in the strength and durability of concrete. The bracing and the liner in the formwork are engineered to resist the pressure of plastic (or fresh) concrete, but to allow trapped air and excess water to pass through and be removed during concrete placement and consolidation. The objective in using permeable formwork is to eliminate voids on the surface of the concrete (bug holes) and to increase the strength and durability of the concrete surface immediately behind the formwork. A review of permeable formwork and its use in placing concrete was conducted. Methods, techniques, and materials are discussed, and example applications are described. Benefits of using permeable formwork include a reduction in bug holes and surface defects, improved resistance to freezing and thawing, reduced rates of surface carbonation and chloride-ion infiltration, increased surface strength, reduced form coating requirements, reduced efforts in curing, and reduced surface preparation for coating. The cost of using permeable formwork varies greatly among job sites. However, the cost of using permeable formwork will generally be double that for conventional impermeable formwork. Cost savings can be realized in the extended life of any wooden formwork used behind the filter fabric, the ability to proceed without applying form-release compounds, the decreased cost of final surface preparation (if coatings are to be applied to the finished concrete), and the increased service life of the finished concrete.
Concrete Permeability and Durability Performance
Durability and service life design of concrete constructions have considerable socio-economic and environmental consequences, in which the permeability of concrete to aggressive intruders plays a vital role. Concrete Permeability and Durability Performance provides deep insight into the permeability of concrete, moving from theory to practice, and presents over 20 real cases, such as Tokyo’s Museum of Western Art, Port of Miami Tunnel and Hong Kong-Zhuhai-Macao sea-link, including field tests in the Antarctic and Atacama Desert. It stresses the importance of site testing for a realistic durability assessment and details the "Torrent Method" for non-destructive measurement of air-permeability. It also delivers answers for some vexing questions: Should the coefficient of permeability be expressed in m2 or m/s? How to get a "mean" pore radius of concrete from gas-permeability tests? Why should permeability preferably be measured on site? How can service life of reinforced concrete structures be predicted by site testing of gas-permeability and cover thickness? Practitioners will find stimulating examples on how to predict the coming service life of new structures and the remaining life of existing structures, based on site testing of air-permeability and cover thickness. Researchers will value theoretical principles, testing methods, as well as how test results reflect the influence of concrete mix composition and processing.
International Research in Engineering Sciences V
Author: Prof. Dr. Servet Soygüder
language: en
Publisher: EĞİTİM YAYINEVİ
Release Date: 2023-03-29
First of all, I wish Allah's mercy to our brothers and sisters who passed away in the earthquake disaster in Kahramanmaraş on February 6, 2023, patience to their families, and healing to the injured. There is a known fact that it is clearly seen that no other science can develop and be applied without engineering science. From medical devices to space vehicles, from agricultural machinery and robots to underwater robots, from unmanned aerial vehicles to defense robots and vehicles, engineering science and technology are required in all scientific fields and applications. Although engineering science has been widely used in the defense fields of countries in recent years, there is a known fact that it is an indispensable building block of medicine and health fields. We hope that engineering science will serve people and all living things more in peace, tranquility, comfortable life and most importantly in health. The saying "To do business with wisdom is with science" is the energy source that science needs.