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Pozzolana cement - response from Rajamane, SERC, Chennai

 
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rajmane
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Joined: 26 Jan 2003
Posts: 160
Location: Chennai

PostPosted: Mon Oct 18, 2004 5:38 am    Post subject: Pozzolana cement - response from Rajamane, SERC, Chennai Reply with quote

18th Oct 2004

Dear fellow engineers

(A) There is some difference between 'pozzolana cements' and 'Portland
pozzolana cements' as per European codes. If Mr. Daljeet refers to the
Portland cement containing pozzolana, then that kind of cement can be
either Portland cement mixed with pozzolana in cement plants then it can
be called Portland pozzolana cement (PPC) as per IS:1489 and if the
mixing of pozzolana with Portland cement is done on site, then it can be
also adopted as per Clause 5 of IS:456-2000.

(B) There is a lot of recent literature to show that Portland cement
containing pozzolana is lot better than Portland cement alone. The
durability (indicated by degree of impermeability and other parameters)
of concretes made with Portland cement containing pozzolana would be
always superior to concretes made with Portland cement even if the
latter concrete is made with very low water-binder ratios. Following
publications of ours may be referred for details apart from many
publications in Indian and foreign journals:
1. Achyutha, H., Praveen Parashar, Rajamane N. P., and Gokularatnam,
C.V., Comparison of Strength and Durability Properties of Concretes
with and without Fly Ash Having Similar 28-Day Compressive Strengths,
Proc., National Conference on Trends in Prestressed Concrete, IIT,
Madras, June 2001, pp 58-66
2. Dattatreya J. K., Rajamane N. P., M. Neelamegam, J. Annie Peter and
S. Gopalakrishnan, Technical consideration for use of fly ash in
structural concrete- a critical review", New Building Materials and
Construction World, Oct. 2002, pp 56-71.
3. Gopalakrishnan S., J. Annie Peter, and N. P. Rajamane, Strength and
durability characteristics of concretes containing high volumes of fly
ash with and without processing, International Conference on Recent
trends in concrete technology and structures (INCONTEST 2003),
Coimbatore, 10-12 Sept 2003, pp 203-206
4. Gopalakrishnan S., N. P. Rajamane, M. Neelamegam, J. Annie Peter and
J. K. Dattatreya, Effect of Partial Replacement of Cement with Fly Ash
on the Strength and Durability of HPC, Indian Concrete Journal, May 2001
5. Neelamegam, M, Annie Peter, J., Rajamane, N. P., Dattatreya, J.K.,
and Gopalakrishnan, S., Influence of Cement type on Workability,
Strength and Durability of Superplasticized Fly ash Concretes, Proc.,
National Conference on Trends in Prestressed Concrete, IIT, Madras, June
2001, pp 45-56
6. Rajamane N P, Making of concrete green through use of fly ash,
Oct-Dec 2003, Green Business Opportunities, Journal published by
Confederation of Indian Industry, pp 22-29.
7. Rajamane N. P., J. Annie Peter and S. Gopalakrishnan, Influence of
blending of fly ash into silica fume concretes at strength levels above
110 MPa, All India Seminar on Fly Ash Utilisation and Disposal, 11-12
October 2003, Chennai, organized by Institution of Engineers (I), TN
Centre, pp 92-110
8. Rajamane N. P., Problems and prospects of use of fly ash in
concrete, All India Seminar on Fly Ash Utilisation and Disposal, 11-12
October 2003, Chennai, organized by Institution of Engineers (I), TN
Centre, pp 66-88
9. Rajamane N. P., J. Annie Peter, and S. Gopalakrishnan. Effect of
high volumes of replacement of cement by fly ash in high performance
concrete of 100 MPa strength, International Conference on innovative
world of concrete (IWC-2003), Pune, 19-21 September 2003, pp 28-35


(C) There should not be any apprehensive on use of fly ash in concrete
provided proper mix design and good construction practices are followed
which is equally applicable to concretes with Portland cement also. Fly
ash could be considered as an essential ingredient of concretes to
improve durability of concrete structures.

(D) It would be interesting to study and I request Shri Daljeet to send
the complete document having the statement given in his E mail.

Thanking you all

N P Rajamane
Deputy Director and Head, Concrete Composites Lab, SERC, CSIR, Taramani,
Chennai 600 113
Ph: 22549152, 22541735 (o), Fax: 22541508


sidhudaljeet@yahoo.com wrote:

Quote:




Hello every body

It is pozzolana cement that is confusing me from last several years, can any one tell what is the reality, is it merely big margin for cement companies or it is really better than OPC  


Quote:
From an article:

A series of investigations carried out by CECRI, (the results of which have been confirmed by the National Building Organisation, New Delhi, and the Central Building Research Institute, Roorkee) show that Indian Pozzolana cements offer less protection to steel subjected to aggressive conditions. Some recent foreign publications also suggest a cautious approach in using different pozzolanic cements. The durability factor for PPC is found to be 0.5 when compared to the OPC concrete. But if the use of PPC cannot be avoided the "Inhibitor" formulation developed by the CECRI may be used to improve the resistance of PPC concrete to a considerable degree.

Views of cement manufacturing companies:

Pozzolana cements are much more durable, corrosion resistant and has every (best possible) things in their Pozzolanic cement products. And trying to get the approval from government to use the PPC in government projects.

Please put some light on this topic please

Daljeet



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