Cement is a generic term used to describe a variety of heavy, inorganic, nonmetallic solids that are made by combining an aggregate and a binder. The three major types of cement are hydraulic, Portland, and, blended. A fourth type, pozzolana, is manufactured in Italy and marketed in the United States by International Materials Technology Corporation (IMTECH), the trading arm of Italcementi SpA.

The ability of cement to harden when mixed with water results from chemical reactions between the binding material and water that continue over time. In some cases this reaction occurs without air and is called “hydration.” The rate at which hydration takes place varies with the chemical composition of the cement, but most rapid curing occurs within three days of mixing. On long-term exposure to air, the cement continues to cure and harden for years after initial set.

Hydraulic cements are produced by heating limestone or marl with clay or shale containing silica or alumina at high temperatures until clinker forms. The clinker is then cooled and ground with gypsum and other additives to produce hydraulic cement powders. Hydraulic cements set very quickly when mixed with water, even underwater; hence their name

Cement is a generic term used to describe a variety of heavy, inorganic, nonmetallic solids that are made by combining an aggregate and a binder. The three major types of cement are hydraulic, Portland, and, blended.

Hydraulic cements set and harden by chemical reaction with water. These are the most common and include portland cement, pozzolans (fly ash), gypsum, slag and silica fume. When mixed (hydrated) with water they form a paste that chemically reacts to set and harden.

Portland cements are the most widely used type of cement in the world. They can be mixed with lime or fly ash (to create blended cements) to reduce the amount of heat released during hydration and early strength gain.

Blended cements may have up to 70% slag, fly ash or limestone in them-often resulting in superior performance compared to ordinary portland cements for certain applications such as concrete for roads and bridges.

1. Cement is a generic term used to describe a variety of heavy, inorganic, nonmetallic solids that are made by combining an aggregate and a binder. The three major types of cement are hydraulic, Portland, and, blended.

2. Cement is the most common material used to produce concrete. The most common type of cement is Portland Cement – there are several types of Portland cement including Type I, Type IA, Type II , and Type IIA.

3. The major difference between the various types of Portland cement is the amount of tricalcium aluminate (C3A) in the cement. Tricalcium aluminate (C3A) reacts very quickly with water and has been known to cause cracking in mass concrete structures.

4. Type I is the basic form of portland cement which contains no restrictions on its use.

5. Type IA is generally only used when air entrainment is required in mass concrete pours such as dams.

6. Type II has moderate sulfate resisting qualities and can be used where some sulfates are present in the soil or groundwater but not in large quantities or where sulfates may be added for certain reasons such as during deicing operations

Pricing for hydraulic, Portland, and blended cements is delivered on a weekly basis. The portland cement price provided is a national average price for gray portland cement. Pricing includes freight, taxes and/or duties, ex-factory or ex-terminal for gray portland cement. Prices include all inland freight, rail and truck to the point of delivery.

The white cement price provided is a national average price for white portland cement. Pricing includes freight, taxes and/or duties, ex-factory or ex-terminal for white portland cement. Prices include all inland freight, rail and truck to the point of delivery.

The blended cement price provided is a national average price for slag/fly ash blended (GGBFS) cement. Pricing includes freight, taxes and/or duties, ex-factory or ex-terminal for slag/fly ash blended (GGBFS) cement. Prices include all inland freight, rail and truck to the point of delivery

The manufacture of hydraulic cement is accomplished by crushing and grinding the raw materials, generally limestone, marl, or chalk, and shale or clay, and then fusing them by high temperature. The resulting product is called clinker. Clinker is ground with gypsum and other materials to produce a fine powder called Portland cement; it also may be combined with fly ash to produce blended cements.

Hydraulic cements are sometimes mistakenly thought of as being waterproof, but they are only water-resistant. They are used for concrete structures that are continually exposed to water in the form of rain or seawater. Hydraulic cements set slowly and develop strength slowly unless accelerators such as calcium chloride are added. The setting process is caused by the chemical reaction of the cement with water; heat is produced during this process.

Portland cement has been the most commonly used type of cement for more than 100 years. When mixed with water, it forms a paste that hardens and binds together other materials to make concrete. Ordinary Portland cement (OPC) is generally gray in color, but white OPC is also available. White OPC provides building owners with an aesthetic advantage: colored concrete can be achieved without pigmenting the mix (a cost-effective approach). In

Hydraulic

The three major types of hydraulic cement are Portland, slag, and fly ash. The basic raw materials used in the manufacture of Portland cement are limestone, clay, iron ore and sand. These materials are mined at a quarry site, crushed and ground into the proper size of particles for the desired type of cement. The mixture is then fed into a kiln where it is heated to about 2,600 degrees Fahrenheit so that it fuses into small pieces called clinker. This clinker is cooled and ground with gypsum and other additives to make the finished product.

Portland cement is made from limestone, clay, iron ore and sand. It is usually gray in color but can be white depending on the ingredients used to produce it. Hydraulic cements are made by inter-grinding or blending Portland cement with other materials such as slag or fly ash. These materials will increase strength and performance characteristics of the cement when mixed with it during concrete production while reducing cost at the same time.

Blended

Blended hydraulic cements are produced by inter-grinding or blending Portland cement clinker with pozzolans, slag or fly ash to produce a material that has chemical properties similar to those of Portland cement but also provides additional