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Cement Products and Services

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Cement Products and Services

All cement products have to satisfy the basic requirements for strength development, durability, early strength development, cost, workability and environmental performance. Depending on the composition of the cement product, these requirements can be satisfied to different degrees.

FAQ

  • How does the fineness of Portland cement affect its performance?

    Typically, cement is ground to very fine particle sizes to enhance its ability to react with water and to increase fluidity in its plastic state. To a point, a smaller particle size improves the mixing characteristics, and strength development of the paste. Finer ground cements tend to set or develop strength quicker than coarser ground products.

  • How is Portland cement made?

    Raw materials (chalk/limestone, clay and sand) are finely ground and proportioned for the desired chemistry. The material is then blended and heated to about 1400 degrees Celcius in rotary kilns. The heated product, called clinker, is allowed to cool, and is then ground to a fine powder along with a small quantity of a mineral called gypsum which present to control setting time.

  • What is Portland cement?

    Portland cement is a fine, powder material produced by heating, at high temperatures, a mixture of minerals containing of lime, alumina, iron, and silica in defined proportions and then grinding the resultant material (clinker) into fine powder. The material is typically mixed with water, sand, and gravel to produce concrete. Cement reacts with water to harden into calcium silicate hydrates resulting in stone-like properties.

  • Is concrete and cement the same thing?

    No - cement is actually an ingredient of concrete. Concrete is basically a mixture of sand, gravel and cement

  • What is the difference between cement and concrete?

    referred to as theAlthough the terms cement and concrete often are used interchangeably, cement is actually an ingredient of concrete. Concrete is a mixture of aggregates and paste. The aggregates are sand and gravel or crushed stone; the paste is water and portland cement. Cement comprises from 10 to 15 percent of the concrete mix, by volume. setting time.

  • When should I use high early strength Portland cement?

    Use high early strength Portland cement concrete when required by contract. When not required, it may be used at the Contractor’s option with approval of the Engineer. For all classes of concrete, high early strength concrete may be produced by using Type III Portland cement.

  • What are the requirements for a Portland cement concrete sieve?

    When these sizes of aggregate are used for portland cement concrete the requirement pertaining to material passing through the No.200 Sieve shall be as follows: *1 When tested during production, the amount passing the No. 200 sieve shall not be greater than 0.6% by weight.

  • ow much lime is liberated from Portland cement?

    When Portland cement combines with water during setting and hardening, Lime is liberated from some of the compounds. The amount of lime liberated appears to be about 15 to 20 percent of the cement weight. On average 23% of water by weight of cement is required for chemical reaction with Portland cement compounds.

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