A cement is a binder, a substance that sets and hardens and can bind other materials together.Cements used in construction can be characterized as being either hydraulic or non-hydraulic, depending upon the ability of the cement to set in the presence of water.(PPC) Portland pozzolan cement includes fly ash cement, since fly ash is a pozzolan, but also includes cements made from other natural or artificial pozzolans. these cements are often the most common form in use.The maximum replacement ratios are generally defined as for Portland-fly ash cement.
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