08-12-2012, 06:24 PM
Self Compacting Concrete
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Introduction
It is highly flowable , non segregating concrete that can spread into place , fill the formwork and encapsulate the reinforcement without any mechanical vibration.
It is the concrete which flows to a virtually uniform level under the influence of gravity without segregation due to which it completely fill the spaces between reinforcement
It is able to consolidate under its own weight
Development
Developed by OZAWA n OKAMURA in the university of Tokyo.
When the construction industry in Japan experienced a decline in the availability of skilled labour in the 1980s, a need was felt for a concrete that could overcome the problems of defective workmanship.
The first usable version of self-compacting concrete was completed in 1988 and was named “High Performance Concrete”, and later proposed as “Self Compacting High Performance Concrete”.
Study n Research
(i) use of rheometers to obtain data about flow behavior of cement paste and concrete
(ii) mixture proportioning methods for SCC,
(iii) characterization of SCC using laboratory test methods
(iv) durability and hardened properties of SCC and their comparison with normal concrete,
(v) construction issues related to SCC
SOME MORE PERSPECTIVES
(i) development of mixture design guideline tables similar to those for normal concrete,
(ii) a shift to more ‘normal’ powder contents in SCC, from the existing high powder mixtures,
(iii) better understanding of the problems of autogenous and plastic shrinkage in SCC,
(iv) development of site quality control parameters such as in ‘all-in-one’, acceptance tests.