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Closing remarks from Econf Moderators

 
This forum is locked: you cannot post, reply to, or edit topics.This topic is locked: you cannot edit posts or make replies. Thank Post    www.sefindia.org Forum Index -> E-conference on Durability of Concrete - Feb 27 to March 11 - 2012
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Econf_Moderator
E-Conference Moderator


Joined: 26 Feb 2012
Posts: 23

PostPosted: Sun Mar 11, 2012 6:00 pm    Post subject: Closing remarks from Econf Moderators Reply with quote

We thank all those who participated in the two weeks E-conference on Durability of Concrete structures. From the discussions made by the participants, the following points emerged



1.       All RMC suppliers should cultivate the habit of quality control in their plants.

2.       Provisions of IS 456 should be revised to keep pace with research especially with respect to concrete durability.

3.       Though the addition of fly ash and other admixtures improve the properties of concrete, several senior engineers are reluctant to use them due to lack of information.

4.       There is also an urgent need to educate people in the field about concrete chemistry, use of admixtures and properties of concrete.

5.       There is a need to study the effect of concrete with fly ash under high temperatures.

6.       In many parts of our country there is a shortage of fine aggregates and good quality water. Hence we may be using rock dust and foundry sand to replace fine aggregate. IS 456 should incorporate provisions for the same and also the 28 day strength as applicable to normal concrete should not be applicable to Concrete containing fly ash.

7.       Concrete containing fly ash should be cured for longer time than ordinary concrete, since they have lower strength at early ages, forms should also be kept for a longer time.

8.       It is necessary for the cement manufactures to make available different grades of cement so that the users will have a choice to use for their structures.

9.       When using fly ash care should be exercised and choosing the right ingredients for concrete is important for durability.

10.   Though it is well known that w/c are w/cm ratio is important for the durability and the strength of concrete it is not maintained properly.

11.   Certification for all persons engaged in construction is necessary in order to obtain durable structures.

12.   Currently only slump and cube test are conducted at site. Other tests such as water penetration test, rabid chloride iron, permeability test, etc should also be made mandatory.

13.   It is important for engineers to follow the technical developments by attending seminars or by reading technical journals.

14.   As modern cements contain high C3S content, it is important to start the curing as early as possible to reduce cracking.

15.   Compatibility of super plastiziers and other chemicals admixtures should be carefully studies.

16.   Mix design is very important especially for FVHA and self-compacting concrete.

17.   Several software tools are available for QA/QC, service life assessment of structures.

18.   It is important to maintain the temperature of fresh concrete at placement to about 30o in general works and less than 20o in special structures.

19.   Performance based specifications for concrete should be developed and they should be used in some special challenging projects.

20.   Cover is the only thing that is protecting reinforcement from corroding, hence proper cover should be maintained and the quality should be ensured by using proper cover blocks.

21.   Durable concrete is a team work of engineers, contractors, consultants, owners and those responsible of maintenance.

22.   In severe environments steel reinforcements may be protected by using galvanization and fusion bonded epoxy coating. It may also be necessary in some cases to use surface quoting of concrete.

23.   Engineers who are having field experience and actual hands-on experience should participate in IS code committees.

With best regards

Econf-Moderators
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