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calcium and concrete

>Return-Path: <quango at wavefront_com>
>X-Sender: quango at wavefront_com
>Date: Tue, 23 Dec 1997 01:10:15 -0800
>To: cyn at metronet_com
>From: Bill Ferguson <quango at wavefront_com>
>Subject: calcium and concrete
>I read your post regarding concrete absorbing CO2.  Concrete goes through a
>two phase curing cycle, the first phase is immediate and is the initial
>hardening. Concrete then continues to absorb CO2 for many years afterwards
>and actually becomes stronger with aging.   
>Its unlikely fish shells will absorb CO2, but in reef tanks CO2 is absorbed
>and released in the Calicum cycle of the water. That's what helps maintain
>the PH in salt water.  
>Your blood and kidneys regulate PH the same way through absorbtion by
>calcium carbonate, and other calcium compounds.
>Bill Ferguson
>quango at wavefront_com
>"The foundational line of true ethical behavior...
>is the degree of freedom from self-centeredness."
>Cosmologist George F.R. Ellis
>    For PGP public key, finger ferguson at quango_net