With certificates of quality, weight, packing and loading issued by independent inspection agencies, we manufacture and supply quality cement conforming to the following standards:
• China’s cement standard GB 175-2007 and clinker standard GB/T 21372-2008;
• American standard ASTM C-150 07;*
• European standard EN 197-1:2000;
• Russian standard GOST 30515-97.
A particular brand, country of origin, etc. are not factors which influence or determine the quality and consistency of the cement which is a big misconception on the side of the Buyers.
The sulfate and alkali contents of the cement clinker much affect the quality of clinker hence of cement, the setting time and the course of hardening.

General knowledge

33 grade – General Construction like plastering, finishing works etc., where high strength is not required.
43 grade – Useful for structural works, precast items etc, Strength development is faster than 33 grade.
53 grade – Used for multi-story buildings, precast prestressed items, bridges, tall structures. Develops very fast strength and speeds up construction.

Important for the Buyers to know:

Cement bag should bear BIS Certification mark • Grade of Cement –Means minimum compressive strength of cement sand mortar cube at 28 days strength when tested as per IS standards.
• Grade of concrete in an important criterion but not the sole criteria to decide the quality of construction. • Durability of construction is the important factor.
• Important factors contributing to the durability are:
1. Type of cement
2. Design Of concrete mix
3. Placing compaction and curing of concrete
4. Subsequent maintenance and repairs.
5. Test Certificate from the supplier
Compressive Strength - Capacity to bear loads, higher strength is preferred.
Soundness - Indicates % expansion due to free lime& magnesia. Excessive expansion reduces durability of structure. The cement with lower value is preferred.
Chloride content & Alkali percentage - The upper limit prescribed by IS for chlorides is 0.05% and alkalis is 0.6%. To control corrosion of steel a good quality of cement should have lower values. Insoluble residue in cement - Non reactive substances in cement. IS specifies a limit of 2 to 4%. Excess indicates adulteration.
Loss on ignition – IS pacifies 4to 5% limit. Excess percentage indicates adulteration.
Markings on the bag - Type, Grade, ISI,Mark, License No. , week of packing. A cement more than 90 days old from the date of packing is required to be retested before use as per IS code requirement.
Check For Adulteration – Cement gives a cool feeling when hand is inserted in the bag. OPC when dropped in a bucket of water it settles down and no floating material is left on the surface. Ideal Color of CEMENT – A good quality cement is greenish grey.
Different types of cement for different applications – Desirable to construction foundations, sewage and water works in Sulphate resistant cements , RCC in 43 or 53 OPC, Plastering and masonry works in PPC. It will optimize the cost and improve the quality of construction.
The most important factors acting on the cement quality are the chemical composition of the raw materials and the clinker, the effect of ferrioxide, S03’ alkali sand magnesia.! A similar importance is due to the way of burning, to the kiln atmosphere, to the se-quence of clinker formation. Cooling and cement properties are strictly related. The grinding fineness markedly affects the early strength. For Portland cements of high early strength, hydraulic setting and hardening can be influenced by admixtures. AIumina cements rely on the formation of CA and CA2In connection “with the hydration of alumina cements both the concrete porosity and the water! cement ratio has to be kept at a minimum.
Cement is a finely ground inorganic material, which, when mixed with water, forms a paste which hardens by means of hydration reactions and which, after hardening, retains its strength and stability even under water.
Portland cement (often referred to as OPC, from Ordinary Portland Cement) is the most common type of cement in general use around the world because it is a basic ingredient of concrete, mortar, stucco and most non-specialty grout. It is a fine powder produced by grinding Portland cement clinker. Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates (3CaO.SiO2 and 2CaO.SiO2), the remainder consisting of aluminum- and iron-containing clinker phases and other compounds. There are three fundamental stages in the production of Portland cement [1]: (a) Preparation of the raw mixture, (b) Production of the clinker, (c) Preparation of the cement Cement quality is typically assessed by its compressive strength development in mortar and concrete. The basis for this property is a well-burned clinker with consistent chemical composition and free lime. The main reason for the clinker free lime to change in situation with stable kiln operation is variation in the chemical composition of the kiln feed. This variation in chemical composition is related to raw mix control and the homogenization process. To ensure a constant quality of the product and maintain a stable and continuous operation of the kiln, the attention must be paid to storage and homogenization of raw materials and kiln feed. Due to variations in the kiln feed chemical compositions that affect its burn ability and the fuel consumption. The raw materials for Portland cement production are the mixture (as fine powder in the ‘Dry process’) of minerals containing calcium oxide, silicon oxide, aluminum oxide, ferric oxide, and magnesium oxide. The homogeneity of feed chemical composition has an important relationship to fuel consumption, kiln operation, clinker formation and cement performance. In this regard an attempt made to deals with the mixing of raw materials process and estimation of composition of raw mill feed, kiln feed, as well as formed clinker, which were done successfully through various results obtained experimentally and various steps have been taken to reduce these variations in clinker quality Cement.
Portland cement is produced by grinding cement clinker in association with gypsum (3-5 %) to specified fineness depending on the requirements of the cement consumers. Cement clinker is produced on large scale by heating finely ground raw materials (Calcareous and Argillaceous materials) at very high temperature up to 1450 oC in rotary kilns. The materials that can be used in cement industry as raw materials are listed in Table below;
Portland cement is the chief ingredient in cement paste - the binding agent in Portland cement concrete (PCC). It is a hydraulic cement that, when combined with water, hardens into a solid mass. Interspersed in an aggregate matrix it forms PCC. As a material, Portland cement has been used for well over 175 years and, from an empirical perspective, its behavior is well understood. The patent for Portland cement was obtained in 1824 by Joseph Aspdin. Chemically, however, Portland cement is a complex substance whose mechanisms and interactions have yet to be fully defined. The Portland Cement Association (PCA) provides the following precise definitions:
Hydraulic cement: Hydraulic binder, ie. a finely ground inorganic material, which, when mixed with water, forms a paste which sets and hardens by means of hydration reactions and processes and which, after hardening, retains its strength and stability even under water.
Portland cement: An hydraulic cement composed primarily of hydraulic calcium silicates. Today, Portland cement is the most widely used building material in the world with about 1.56 billion tones produced each year. Annual global production of Portland cement concrete hovers around 3.8 million cubic meters (5 billion cubic yards) per year as of 2004.

Portland cement types and their uses

Portland cement is hydraulic cement produced by milling clinker, which includes calcium silicates, calcium aluminates with calcium sulphate as an additive. Due to the fact that its low cost and widespread availability of its raw material, limestone, Portland cement one of the materials widely used. In order to meet different physical and chemical requirements for specific purposes, such as durability and high-early strength, different types of portland cement are manufactured. American Society for Testing Materials (ASTM), and European Standards (EN) exhibit some differences.

Portland Cement (American Standard Type) - Eight types of cement are covered in ASTM C 150. These types and brief descriptions of their uses are listed in Table below.

Portland Cement (European Standard Types) - EN standards use two types of Portland cement: CEM I: Portland Cement and CEM II: Composite-Portland Cement

The process is consists of three stages: feeding, grinding, and separating.

Physical Properties of each type of cement include;

1. Fineness
2. Setting time
3. Soundness
4. Compressive strength
5. Heat of hydration
6. Loss of ignition

Summary about cement

Cement was first discovered by an English brick layer named Joseph Aspdin in 1824. He called it Portland cement for the reason that the cement he discovered resembled the limestone found in Portland.
The approximate composition of Portland cement is given below Lime (CaO) 60 – 70% Silica (SiO2) 20 – 25% Alumina (Al2O3) 5 – 10% Ferric oxide (Fe2O3) 2 – 3 %
The raw materials used for the manufacture of Portland cement are limestone (provides CaO) and clay (provides SiO2 , Al2O3 and Fe2O3) which are finely powdered and then mixed in the ratio 3 : 1 by mass.
The mixture is again ground to a fine powder and water is added. The finely ground powder called slurry is heated to 1773 K in a rotary kiln. On heating, lime, silica, alumina and ferric oxide react together and produces a mixture of dicalcium silicate, tricalcium silicate and tricalcium aluminate called clinker. The clinker is cooled and a small amount of gypsum (2 – 5%) is added to it, to delay the setting time of cement. The mixture of clinker and gypsum is then ground to a fine powder which is called cement. It is stored in tall structures called silos. The cement is then packed in water-proof bags and sold in markets.
When cement is mixed with water, it becomes hard over a period of time. This is called setting of cement. Gypsum is often added to Portland cement to prevent early hardening or “flash setting”, allowing a longer working time.
What are Different Grades of Cement? The grade 43 and 53 in cement mainly corresponds to the average compressive strength attained after 28 days ( 6724 hours) in mega pascals (Mpa) of at least three mortar cubes ( area of face 50 cm squared) composed of one part cement, 3 parts of standard s and ( conforming to IS 650:1966) by mass and P/4 ( P is the percentage of water required to produce a paste of standard consistency as per IS standard) + 3 percentage ( of combined mass of cement plus sand) of water , prepared, stored and tested in the manner described in methods of physical test for hydraulic cement.
721 hr not less than 23 MPa for 43 grade, 27 MPa for 53 grade 1682 hrs not less than 33MPa for 43 grade, 37MPa for 53 grade 6724 hrs not less than 43MPa for 43 grade, 53 MPa for 53 grade.