| 摘要 |
<p>Admixtures for hydraulic cement compositions, and particularly Portland cement concrete compositions which contain pozzolans such as fly ash, are described which are mixtures containing at least two chemical ingredients, namely. alkali metal or alkaline earth metal salts of bromine and alkali metal or alkaline earth metal nitrite salts. These admixtures optionally further include triethanolamine as a third ingredient.</p> |
