02-05-2012, 04:47 PM
A DETAILED CASE STUDY OF CONCRETE IN NEXT GENERATION
moulali ppt on futue concrete.doc (Size: 70.5 KB / Downloads: 79)
ABSTRACT:
The paper describes the new changes in concrete technology over in the fourth coming periods and its use. This innovative technology of concrete was introduced to make the work easier and immediate or any architectural effects are to be enhanced.
It is not possible to know even 10% of the total available knowledge about concrete, but it is possible to learn how to function as a forward-looking, receptive, discriminating and contributing member of the concrete fraternity.
Introduction:
I describe myself as “A detailed report of concrete in 22nd century” suggesting that concrete technology is my religion and I preach it to anyone who will listen to me. Developing and maintaining world’s infrastructure to meet the future needs of industrialized and developing countries is necessary to economically grow and improve the quality of life. The quality and performance of concrete plays a key role for most of infrastructure including commercial, industrial, residential and military structures, dams, power plants. Concrete is the single largest manufactured material in the world and accounts for more than 6 billion metric tons of materials annually. Initial and life-cycle costs play a major role in today’s infrastructure development. There have been number of notable advancements made in concrete technology in the last fifty years. We should be aware that concrete can be made without cement and reinforced without steel. It is sometimes made without coarse aggregate and often without natural sand.
Difference between concrete at present and in future:
There is already a rapidly increasing trend to the use of self-compacting concrete (SCC). It can be anticipated that this trend will continue and the need to vibrate concrete may become relatively rare. Such concrete requires an adequate proportion of fine material and fly ash is likely to be used in substantial proportion. There may be a tendency to use a smaller maximum size of aggregate, although for under-reinforced slabs, 40mm may still be desirable to provide shear resistance across a cracked
Another development is reactive powder concrete (RPC), Ductal, and the like, offering strength of several hundred MPa. This material is essentially mortar with nothing coarser than a fine sand and often containing fibres. Currently it appears justified only for very limited small scale use, but this could change.Both these materials rely heavily on the use of admixtures and further development of admixtures
could greatly affect the competitiveness of these materials.
Advances in Concrete Technology:
The development of chemical admixtures has revolutionized concrete technology in the last fifty years. The use of air entraining admixtures, accelerators, retarders, water reducers and corrosion inbitititors are commonly used for bridges.
Recycled concrete aggregates and slag aggregates are being used where appropriate. As the useable sources for natural aggregates for concrete are depleted utilization of these products will increase.
Recycled concrete aggregates and slag aggregates are being used where appropriate. As the useable sources for natural aggregates for concrete are depleted utilization of these products will increase.
Continuous gradation and consideration of workability during laboratory testing are slowly gaining acceptance in practice.
Higher strength concrete for bridges is commonly used for columns and beams. Higher strength concrete usually provides higher abrasion resistance and where appropriate this is considered in the bridge deck and pavement designs. “Rapid Chloride Permeability Test.”
This is a surrogate procedure which measures flow of electrical current comes in lead. In-situ concrete testing, effective curing practices and utilization of computer software to monitor concrete strength development as well as minimizing cracking potential are used on major transportation projects.
.Good life span, economy &difference:
Concrete meeting special performance requirements that cannot always be achieved routinely using conventional constituents and normal mixing, placing, and curing practices Many conferences and publications since 1990s.
Many structures are demolished because they have become unsuitable for society’s needs rather than because they did not last. “Life cycle costing” may be ruthlessly applied, paying for better concrete only when financially justified. On the other hand untold millions are being consumed in repairing structures that should, and could, have been built better and “durability of appearance” may be considered alongside structural durability.
Concrete: advantages in the Next Generation:
CONCRETE: The Next Generation incorporates new songs into the material of the original CONCRETE. The work is structured around several "internal discussions" reflecting the jumble of everyday thoughts about ideas which are "right in front of section us," and for which the singers use a rapid and rhythmically altered conversational style. Interjected into these discussions are solo arias which tell the "secret" lives of people the old man has known - ordinary people who did extraordinary things for which they will never be recognized