NEW TRENDS IN CONCRETE TECHNOLOGY.

There are many new technologies and materials have come forward in day to day progress in concrete technology.

The new technology are as fallows,

New technologies :

Utilization of materials-

The new construction material concrete products and demolition wastes and lime production waste

New construction materials were developed and patented in Brazil, based on concrete production and demolition wastes mixed with lime production waste. The main objective of this research is to utilize these two types of industrial wastes on as large a scale as possible as a new raw materials for the production of concrete.

concrete waste with the lime component, which led to the growth of new amorphous and crystalline calcium hydro -silicates such as Tobermorite, Afwillite and the CSH mineral group. Although this research does not include an economic feasibility study, the zero cost of these novel raw materials for concrete is self-explanatory. However, the main advantage expected from these materials is the environmental conservation they afford, represented by the use of concrete production and demolition wastes and lime production waste.

Fire technology :-

 New construction techniques and the growing number of building materials have resulted in the modification of old fire test methods and the development of new ones. Many otherwise useful materials have failed the highly restrictive no combustibility test that is in use today. The author suggests that tests more basis than the full scale fire endurance tests must be devised to more accurately evaluate the effects of combustible materials under fire conditions.

New Engineering Standards - Develop comprehensive standards for the basic building elements required for rapid-erection approaches. Develop material, component, and system standards for accurate and unambiguous description and specifications for effective communication of needs between engineering, procurement, and site management. Material Utilization Simulation Models - Develop simulation tools for predictive material placement and utilization strategies and for evaluating alternate design scenarios during the project engineering phase.

Improved Testing Methods and Approvals - Refine testing methods and approval processes to accelerate the development of new materials and components and provide materials databases to support the implementation of model-based design

Develop affordable, smart materials and components that support the vision of rapid-erecting and self-erecting facilities; reduce the cost to manufacture and fabricate materials and components; and reduce the cost to place, join, and install them with high labor productivity, zero waste, and zero rework.

Improved Materials Engineering

RECENT PROGRESS IN RESEARCH ON AND CODE EVALUATION OF CONCRETE CREEP AND

SHRINKAGE IN JAPAN 

This paper introduces the recent state of research on creep and shrinkage of concrete in Japan, focusing on several unique advances: new prediction models in design code, development of database, autogenous shrinkage and prediction of cracks in structural members. New prediction models for creep and shrinkage of concrete, which can be applied to high-strength concrete, were adopted in the JSCE standard specification for concrete structures in 2002. A creep and shrinkage database was developed and made available for international use. Thus Japanese researchers can be said to have made important contributions to research on autogenous shrinkage of concrete in the last ten years.

Durability of concrete structures is seriously compromised by cracking in early age concrete, particularly in high-strength or massive concrete structures. Since early age cracking is influenced by various highly interrelated factors that affect the hydration process and stress/strain development, its behavior is highly complex and no rational methodologies for its control have yet been established. On the other hand, demands for high strength and massive concrete structures in modern cities are ever growing, regardless of the many durability problems. More comprehensive methodologies for the control are therefore essential to ensure sustainability of such structures. This report reviews state-of-the-art research on mechanisms that cause complex cracking phenomena and newly developed methodologies to control early age cracking.

Testing of materials is very important one of them is NDT method.

No destructive testing on concrete are said so because these test can be performed in-situ , as well as in laboratory without destructing the concrete member and results about strength and durability can be obtained . NDT method are simple to perform but the analysis and inter presentation of test results are not so easy .

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