www.sefindia.org

STRUCTURAL ENGINEERING FORUM OF INDIA [SEFI]

 Forum SubscriptionsSubscriptions DigestDigest Preferences   FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups  RegisterRegister FAQSecurity Tips FAQDonate
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log in to websiteLog in to websiteLog in to websiteLog in to forum 
Warning: Make sure you scan the downloaded attachment with updated antivirus tools  before opening them. They may contain viruses.
Use online scanners
here and here to upload downloaded attachment to check for safety.

Durability

 
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
View previous topic :: View next topic  
Author Message
TPS61
SEFI Regulars
SEFI Regulars


Joined: 07 Feb 2011
Posts: 21

PostPosted: Mon Feb 27, 2012 11:57 am    Post subject: Durability Reply with quote

I fully endorse Vijay Kulkarni's comments regarding SCMs( Supplementary Cementitious materials) as well as the sustainability approach. 
Many studies were undertaken in U.S. & Canada in the last 30 years pertaining to the "epidemic of Concrete deterioration". Useful lessons were learnt including some v. important ones from the 2000 yr. old pantheon in the use of Volcanic ashes. 
 
Unfortunately most of our practicing engineers, specially structural engineers are not fully aware of the benefits of SCMs in concrete. Dr. P.K. Mehta ( prof. emeritus Berkeley) and Dr. V.M. Malhotra of CANMET fame worked hard in bringing the knowhow of Fly Ash and High Volume fly ash Concrete into the Indian constuction environment 10 years ago. Numerous free conferences and several Demo projects were held between 2002 and 2005 to make the Indian porfessionals comfortable with HVFAC. Much of the technical information including international papers as well as data generated during these demo projects is still available on the hvfacprojectindia website.  SEFIans and all other professionals are urged to go thru this mine of information on Durable concrete.
Dr. Abdun-Nur a renowned concrete technologist says " Concrete without SCMs and chemical admixtures is good only for museums" but it is a pity that many structural engineers still resist the use of FLY ash in concrete. It is a pity that many have not tried to learn about CONCRETE as a material while they have been designing skyscrapers in it using sophisticated softwares for years.  
Knowledge is available to produce durable concrete today. Tools like the RCPT test are available to convince oneself about the enhanced durability of modern High performance concretes. The knowledge  just needs to be acquired / disseminated and used. 
 

Posted via Email
Back to top
View user's profile Send private message
Dr. N. Subramanian
General Sponsor
General Sponsor


Joined: 21 Feb 2008
Posts: 5296
Location: Gaithersburg, MD, U.S.A.

PostPosted: Mon Feb 27, 2012 9:59 pm    Post subject: Re: Durability Reply with quote

Dear Er Singh,

Thank you for your comments about use of Supplementary Cementitious materials.

I doubt whether concrete technology is part of the curriculum in many colleges!
As you have rightly pointed out Supplementary Cementitious materials not only increase the durability by filling the minute pores in concrete and making is less permeable, they also reduce the CO2 emissions of Concrete usage and make concrete sustainable.

But as the strength gain, when using these materials, is slow initially engineers should be careful not to load these structures at the early age and cure them for at least 10 days as against the 7 days for concretes without such materials.

Regards
Subramanian
TPS61 wrote:
I fully endorse Vijay Kulkarni's comments regarding SCMs( Supplementary Cementitious materials) as well as the sustainability approach.
Many studies were undertaken in U.S. & Canada in the last 30 years pertaining to the "epidemic of Concrete deterioration". Useful lessons were learnt including some v. important ones from the 2000 yr. old pantheon in the use of Volcanic ashes.

Unfortunately most of our practicing engineers, specially structural engineers are not fully aware of the benefits of SCMs in concrete. Dr. P.K. Mehta ( prof. emeritus Berkeley) and Dr. V.M. Malhotra of CANMET fame worked hard in bringing the knowhow of Fly Ash and High Volume fly ash Concrete into the Indian constuction environment 10 years ago. Numerous free conferences and several Demo projects were held between 2002 and 2005 to make the Indian porfessionals comfortable with HVFAC. Much of the technical information including international papers as well as data generated during these demo projects is still available on the hvfacprojectindia website.  SEFIans and all other professionals are urged to go thru this mine of information on Durable concrete.
Dr. Abdun-Nur a renowned concrete technologist says " Concrete without SCMs and chemical admixtures is good only for museums" but it is a pity that many structural engineers still resist the use of FLY ash in concrete. It is a pity that many have not tried to learn about CONCRETE as a material while they have been designing skyscrapers in it using sophisticated softwares for years.  
Knowledge is available to produce durable concrete today. Tools like the RCPT test are available to convince oneself about the enhanced durability of modern High performance concretes. The knowledge  just needs to be acquired / disseminated and used.


Posted via Email
Back to top
View user's profile Send private message
Display posts from previous:   
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 All times are GMT
Page 1 of 1

 

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


© 2003, 2008 SEFINDIA, Indian Domain Registration
Publishing or acceptance of an advertisement is neither a guarantee nor endorsement of the advertiser's product or service. advertisement policy