08-12-2014, 04:53 AM
Plz Provide Any (Title: Suitability of HVFA concrete for pavements) project report on the above title.....
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suitability of hvfa concrete for pavements
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Plz Provide Any (Title: Suitability of HVFA concrete for pavements) project report on the above title.....
07-04-2017, 11:19 AM
Concrete pavements that use between 40 and 60 percent of quality fly ash can be characterized as high volume flywheel concrete (HVFA). The use of HVFA concrete can not only lead to the sustainable development of the cement and concrete industries, but also provide a durable and economical alternative. To achieve the desired properties of strength and durability, maintaining a low water-cement ratio is essential along with the use of a superplasticizer. The pore-filling effect and pozzolanic properties of fly ash improve the properties of fresh and hardened concrete. Properties such as higher bending strength, low temperature regimen, low water / gas absorption and permeability and suitable abrasion resistance can be used in the manufacture of concrete pavers with high volume fly ash. The economy in construction can be achieved through the use of fly ash and the reduction of pavement thickness.
The use of Fly Ash high volume concrete in construction is a solution to the environmental degradation caused by the cement industry. The concept is very much in line with the era of sustainable development. As the cement industry alone is responsible for 7% of the world's carbon dioxide emissions, ¹ responsible for global warming, the construction industry needs attention to solve the problem. Volatile ash The concrete mix contains smaller amounts of cement and higher volumes of fly ash (up to 60%) ². From the available literature, it is found that the proportions of fly ash in concrete can vary from 30% - 80% for several grades of concrete.
The use of fly ash in high performance concrete has been tested for a long time and sufficient literature and data are available on the subject but very little research has been done in India on this front. In addition, the fly ash properties available from various sources and even from the same source at different times are not constant. Therefore, the results available on a particular fly ash in a particular country can not be installed in all places. Therefore, there is a scope of study of the effect of variable percentages of fly ash on various properties of different grades of concrete in India. Flying ash is more commonly used as a pozzolone in particular. Pozzolones are siliceous or siliceous and aluminous materials, which in a finely divided form and in the presence of water, react with calcium hydroxide at ordinary temperatures to produce cementitious compounds. The spherical shape and particle size distribution of the fly ash improves the flow ability of the fluid filler, thus reducing the demand for mixing water and contributing to the long-term strength of the high-strength fly ash concrete. The use of fly ash in HSC and HPC has been studied by several researchers in the past. The use of fly ash in concrete has been promoted around the world, Adams [1988] 10. Naik et al. [1989] 11 replaced 40% of cement by fly ash and achieved an increase in concrete strength of 23% and 38% at 28 days and 56 days, respectively. Raju et al. [1994] 12 also tested a 40% replacement of cement by fly ash and achieved a characteristic strength of 45 MPa at 28 days with a W / C ratio of 0.4. The benefits of incorporating fly ash into concrete have been demonstrated through extensive research and innumerable highway and bridge construction projects. Benefits for concrete vary depending on the type of fly ash, the ratio used and other ingredients of the mixture, the mixing procedure, field conditions and placement.
The use of Fly Ash high volume concrete in construction is a solution to the environmental degradation caused by the cement industry. The concept is very much in line with the era of sustainable development. As the cement industry alone is responsible for 7% of the world's carbon dioxide emissions, ¹ responsible for global warming, the construction industry needs attention to solve the problem. Volatile ash The concrete mix contains smaller amounts of cement and higher volumes of fly ash (up to 60%) ². From the available literature, it is found that the proportions of fly ash in concrete can vary from 30% - 80% for several grades of concrete.
The use of fly ash in high performance concrete has been tested for a long time and sufficient literature and data are available on the subject but very little research has been done in India on this front. In addition, the fly ash properties available from various sources and even from the same source at different times are not constant. Therefore, the results available on a particular fly ash in a particular country can not be installed in all places. Therefore, there is a scope of study of the effect of variable percentages of fly ash on various properties of different grades of concrete in India. Flying ash is more commonly used as a pozzolone in particular. Pozzolones are siliceous or siliceous and aluminous materials, which in a finely divided form and in the presence of water, react with calcium hydroxide at ordinary temperatures to produce cementitious compounds. The spherical shape and particle size distribution of the fly ash improves the flow ability of the fluid filler, thus reducing the demand for mixing water and contributing to the long-term strength of the high-strength fly ash concrete. The use of fly ash in HSC and HPC has been studied by several researchers in the past. The use of fly ash in concrete has been promoted around the world, Adams [1988] 10. Naik et al. [1989] 11 replaced 40% of cement by fly ash and achieved an increase in concrete strength of 23% and 38% at 28 days and 56 days, respectively. Raju et al. [1994] 12 also tested a 40% replacement of cement by fly ash and achieved a characteristic strength of 45 MPa at 28 days with a W / C ratio of 0.4. The benefits of incorporating fly ash into concrete have been demonstrated through extensive research and innumerable highway and bridge construction projects. Benefits for concrete vary depending on the type of fly ash, the ratio used and other ingredients of the mixture, the mixing procedure, field conditions and placement.
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