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Supplementary Cementing Materials-A Note

 
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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suraj
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PostPosted: Mon Feb 27, 2012 7:40 am    Post subject: Supplementary Cementing Materials-A Note Reply with quote

A note from P.E. Suraj Singh
Supplementary Cementing Materials- A Note  (Download Article using Link at Bottom)

    Objective of this note is to apprise budding engineers about past as well as, current developments continuing in construction engineering field which ultimately, effect quality of concrete.

    Certain portion on attached file may be repetition of reading materials yet, information can be used to understand very briefly about concrete application.

    Very brief talk has been included relating to Supplementary Cementing Materials that are commonly used for Cement replacement to produce cementitious materials that do improve quality & performance of concrete to serve intended purpose adequately in long run without considerably loosening induced characteristics of concrete, which is defined as Durability.

    Certain parts have been included based on personal experiences on projects while, others, have been modified extracts from codes .



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Supplementary Cementing Materials

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Dr. N. Subramanian
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PostPosted: Fri Mar 02, 2012 5:10 pm    Post subject: Re: Supplementary Cementing Materials-A Note Reply with quote

Dear Er Suraji,

Your note will be useful.

In this connection I draw attention to a discussion in another forum- regarding the max amount of flyash to be used in structural concrete:

http://www.linkedin.com/groupItem?view=&srchtype=discussedNews&gid=101510&item=97337073&type=member&trk=eml-anet_dig-b_pd-ttl-cn&ut=3b3O0ZNWcCqB81

Regards
NS
suraj wrote:
A note from P.E. Suraj Singh
Supplementary Cementing Materials- A Note  (Download Article using Link at Bottom)

    Objective of this note is to apprise budding engineers about past as well as, current developments continuing in construction engineering field which ultimately, effect quality of concrete.

    Certain portion on attached file may be repetition of reading materials yet, information can be used to understand very briefly about concrete application.

    Very brief talk has been included relating to Supplementary Cementing Materials that are commonly used for Cement replacement to produce cementitious materials that do improve quality & performance of concrete to serve intended purpose adequately in long run without considerably loosening induced characteristics of concrete, which is defined as Durability.

    Certain parts have been included based on personal experiences on projects while, others, have been modified extracts from codes .
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suraj
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Joined: 17 Apr 2008
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Location: NCR Faridabad, E mail suraj_engineer@yahoo.co.uk

PostPosted: Fri Mar 09, 2012 6:18 am    Post subject: Alkali Aggregate Reaction-Alkali-Silica reaction in concrete Reply with quote

Alkali Aggregate Reaction-Alkali-Silica reaction in concrete
Subnote
<o> </o>
Forward:<o></o>
1.      To ensure durability whether or not, achieved by concrete, certain significant tests though not in general, but, are carried out depending on requirements under specifications.<o></o>
2.      Some of tests that have recently been mandated, is Alkali Silica Reaction while other, is Rapid Chloride Penetration. Laboratory procedures for conducting such tests, are elaborated in testing methods under codes. <o></o>
3.      Just indicative theoretical reference is given herein for certain understanding of what Alkali & Silica in Aggregate, are related to? <o></o>
4.      It is suggested about contents of this sub note being based on collections from experience. Of course, there is no guaranteed certification respecting durability delivery but, code provisions requirements are to be met.<o></o>
5.      Also, experienced during concrete pours & placement that while, using supplementary cementing material as replacement of cement, initial crack formation is prevented to a considerable extent, should adequate initial curing arrangements are resorted to.<o></o>
6.      Though other senior & eminent authors have covered, various aspects relating to this subtopic, yet, it is tried to present a little more.<o></o>
7.      Various cracks were noted during field construction of a sewage treatment plant in gulf that exhibited cracks on walls even, after using 30 % replacement of cement by PFA. Later, size of rebar dia & its spacing were experimentally, altered to prevent cracking formation. <o></o>
8.      It was suggested to representing managers to better use GGBS but, due to some restraints, it was not permitted. Later, it was noticed that surface exhibited certain improvement after reduction of rebar spacing & reducing bar size as well in addition to reducing length of wall panel. It is further added as explained in previous note that GGBS can be controlled to have desired fineness, while PFA not.<o></o>



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Alkali Silica Reaction-Sub Note

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