Pozzolana, also known as pozzolanic ash, is a fine, sandy volcanic ash. Pozzolanic ash was first discovered and dug in Italy at Pozzuoli , in the region around Vesuvius. It was later discovered at a number of other sites as well.
Pozzolana is a siliceous and aluminous material which reacts with calcium hydroxide in the presence of water. This forms compounds possessing cementitious properties at room temperature which have the ability to set underwater. It transformed the possibilities for making concrete structures, although it took the Romans some time to discover its full potential. Typically it was mixed two-to-one with lime just prior to mixing with water. The Roman port at Cosa was built of Pozzolana that was poured underwater, apparently using a long tube to carefully lay it up without allowing sea water to mix with it. The three piers are still visible today, with the underwater portions in generally excellent condition even after more than 2100 years.
Portland Pozzolanic Cement improves the Properties of Fresh Concrete.
PPC improves the workability, placement and consolidation of concrete.
PPC is compatible with chemical admixtures in a similar manner to OPC concrete. Slight adjustments in admixture dosages may be necessary to achieve desired results.
Portland Pozzolanic Cement improves Concrete Strength and Elastic Modulus :
PPC provides higher levels of compressive strength in concrete when compared with ordinary portland cement (OPC) concrete of equal cement content. Normally 15-35 % Fly ash addition is desirable to achieve optimum compressive strength. Concretes made with PPC will generally exhibit higher flexural strength for a given level of compressive strength. Modulus of elasticity follows the same relationship as OPC concrete, when based on compressive strength. Thus, with the higher compressive strengths achievable with PPC, structural stiffness can be enhanced, and load deflections minimized.
Portland Pozzolanic Cement reduce Permeability and Corrosion:
Low permeability is essential for long-term durability, especially with regard to corrosion resistance of reinforcing steel. The additional Calcium Silicate Hydrate formed and denser cement paste in PPC concrete reduce pore size and reduced concrete permeability. Low permeability reduces the ingression of harmful substances (such as chlorides and sulfates) and the availability of water to catalyze harmful chemical reactions within concrete.
Portland Pozzolanic Cement Improves Resistance to Alkali-Aggregate Reaction:
Alkali Aggregate Reaction occurs when the alkali in portland cement react with reactive Silica of aggregates to form an expandable gel that causes the concrete to crack, swell and prematurely deteriorate. PPC mitigates Alkali Aggregate Reactivity by reacting with the alkalis in portland cement and making them unavailable for reaction.
Sulfate attack occurs when sulfates, found in seawater and some soils, react with the tricalcium aluminate in portland cement. This causes an expansive reaction and resulting deterioration of the concrete structure. Since Portland Pozzolanic Cement is containing less Tricalcium Aluminate , and thus lowers the total amount of Tricalcium Aluminate available for reaction.
Structures and foundations
Mass concrete applications, such as dams
Precast concrete, such as pipe and block
Prestressed or post-tensioned concrete
Concrete exposed to water and marine applications
High-performance/high-strength concrete, used typically in high-rise building or bridges to give 100 year service life
About the Company
Year of Establishment1958
Legal Status of FirmLimited Company (Ltd./Pvt.Ltd.)
Nature of BusinessManufacturer
Number of EmployeesMore than 1000 People
Annual TurnoverRs. 5 - 10 Crore
IndiaMART Member SinceMay 2010
The HeidelbergCement Group is a global market leader in aggregates and a prominent player in the fields of cement, concrete and other downstream activities, ranking as one of the world’s largest manufacturers of building materials.