Re: ORGLIST:organic admixtures

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From: Jacob Zabicky (zabicky$##$bgumail.bgu.ac.il)
Date: Sun Jun 16 2002 - 12:17:38 EDT

Hello M,

Some important types are

1. Superplasticizers, some of them derived from the pulp and paper
industry, that improve the rheology of fresh concrete and lower the water
demand for attaining a desired "workability".

2. Retardants, belonging to several clases of compounds, as their name
indicate, lower the rate of hardening of fresh concrete. They are used in
premixed concrete, to assure its safe arrival to the building site.

3. Several types of carbosilanes and siloxanes confer hydrophobicity and
help control the pore size of mature concrete.

4. Besides physicochemical effects attained by the above, fibers made of
organic polymeric materials may confer outstanding mechanical properties,
such as resistance to compression and bending, and dimensional stability.

All the best,

Jacob

At 20:29 15/06/2002, mbarakat wrote:
>hi all does any one have recent information about organic admixtures added
>to cement
>thanks
>MBarakat
>
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><DIV><FONT face=Arial size=2>hi all does any one have recent information about
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><DIV><FONT face=Arial size=2>MBarakat</FONT></DIV></BODY></HTML>

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Prof. Jacob Zabicky
Institutes for Applied Research
Ben-Gurion University of the Negev Private: POB 12366, Beer-Sheva 84863
POB 653, Beer-Sheva 84105, ISRAEL Tel. +972-8-6496792
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