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- Cement is classed as any bonding agent used
- to unite particles in a single mass or to
- cause one surface to adhere to another.
- Portland cement is a powder obtained from
- burning together a mixture of lime and clay,
- and when mixed with water and sand or gravel,
- turns into mortar or concrete. The term
- "cement" covers a variety of materials, such
- as fluxes and pastes, and also bituminous
- products obtained from tar.
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- Subject by: Russell Webb
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