OPC Cement

Dalmia DSP Cement





Dalmia DSP Cement


Test Certificate of Dalmia DSP Cement

Dalmia DSP Consumer Leaflet

Dalmia DSP, the epitome of ‘dhalai expertise', is a specialized and best-in-class offering from the house of Dalmia Bharat Cement, one of the largest cement manufacturers of the country, pioneering super-specialty cements for more than 75 years.

Specifically engineered for high-impact concrete applications and served in revolutionary “BOPP Laminated” packaging, Dalmia DSP is not only a first-of-its-kind in the country, but also a quality-leader in the premium category of cements.

Manufactured at ultra-modern plants, Dalmia DSP comes loaded with Delta 25 Power and is passed through stringent quality parameters. It is a premium-quality slag cement produced from high-grade Portland cement clinker, imported gypsum and superior ground granulated blast furnace silica rich slag (GGBS) obtained from the most reputed steel manufacturers of the country. This not only ensures optimal particle size (fineness), ease of working and the best setting time, but also the highest level of strength, making Dalmia DSP the best choice for casting.

The Power of Delta 25

1.7 times finer grains: Optimal fineness of Dalmia DSP, around 1.7 times the Bureau of Indian Standards’ (BIS) recommendation of 225 m2/kg, ensures higher volumetric yield of cement per bag, hence better coverage of concrete and plaster, resulting into economical mixes. A higher surface area with finer cement particles ensures more cohesiveness and compactness in concrete and a faster rate of gain of strength.

6 times greater initial setting time: The initial setting time (IST) of cement is calculated from the time water is added to a mix till the paste hardens (after stiffening or loss of plasticity), following which the concrete begins to gain strength. In Dalmia DSP, it is ensured that the cement paste hydrates normally and it does not lose plasticity before placement. This facilitates sufficient time for preparation, effective placement and finishing of mixes.

50% quicker final setting time: As per BIS guidelines, the final setting time (FST) of cement should not be greater than 600 minutes. This also has significant influence on the de-shuttering schedule of vertical surface of concrete members like columns, beam sides, slab sides & wall forms. In Dalmia DSP, the FST has been regulated to 50% less the permissible time set by BIS. This ensures accelerated strength development of concrete & mortar immediately after the FST.

High soundness: Soundness is a measure of volumetric stability in concrete. Unsoundness or expansion happens due to presence of magnesia and free lime. In Dalmia DSP, it is ensured that the expansion of concrete upon hardening is negligible, only 10% of the permissible limit of 10mm. Volume stability is essential for strength and durability of concrete, which otherwise may lead to expansion or volume change and consequent disruption of concrete.

High 1-day strength: The 1-day strength of Dalmia DSP Cement is in the range of 15-16 MPa, which is 50% of 28-day strength as recommended by BIS. This strength gain in 24 hours facilitates speedy construction and faster release of form work.

70% more strength: 33 MPa is the strength specified by BIS for PSC cement. In Dalmia DSP, the strength achieved in 28 days is in range of 56-58 MPa, 70% more than the criteria set by BIS. A superior 28-day compressive strength facilitates optimised designs and improved scientific mixes. This in turn brings down cement consumption per cubic meter, yields high performance concrete, and supports slimmer & slender section designs.

50% lower insoluble residue: A measure of purity of cement, insoluble residue (IR) in OPC and PSC result from poor quality of gypsum. The average insoluble residue in Dalmia DSP is just 45% of the permissible limit of BIS, since only the purest form of gypsum is used. IR as low as 1.6-1.8% in Dalmia DSP eliminates chances of concrete corrosion due to high chlorides or other impurities present in gypsum.

Low Magnesium Oxide: Presence of Magnesium Oxide (MgO) in raw material acts as a flux and facilitates clinkerisation. However, excessive quantity of MgO remains uncombined even after clinkerisation, affecting the soundness of concrete, and leading to expansion at lateral ages, cracks and ruptures. In Dalmia DSP, the quantity of MgO is restricted to less than 65% of the limit allowable by BIS, eliminating chances of any excess.

50% less Sulphuric Anhydride: Sulphuric Anhydride (SO3) indicates the amount of gypsum used in cement. Gypsum controls the hydration of C3A and is added to cement to retard its setting time. Gypsum (CaSO4.2H2O) contains SO3, an excess of which affects the structural soundness apart from bringing in excessive impurities. Sulphuric Anhydride in Dalmia DSP has been regulated to less than 50% of the allowable limit which signifies purity of cement.

60% lower loss on ignition: Free Lime (CaO) present in cement readily absorbs moisture & hydrates when exposed to moist atmosphere to form Ca(OH)2, which subsequently gets converted CaCO3. The moisture from the atmosphere is also absorbed by gypsum which during grinding loses its water of crystallization partially. Dalmia DSP Cement is fully liberated from Free Lime (CaO), and the same is ensured through strictest quality controls. Loss on ignition (LOI) of Dalmia DSP is 60% less than as permitted by BIS, indicating the cement is fresh and not hydrated. Concrete made with cement with higher LOI than specified results into poor strength development, reduced durability & lower service life.

Less than 20% Sulphide Sulphur: Low content of Sulphide Sulphur (S) is a prerequisite for any good quality PSC. As per IS: 455 " 1989, the permissible limit of Sulphide Sulphur is 1.5% in PSC, whereas it is in the range of 0.2-0.3% in Dalmia DSP. Sulphide Sulphur is a deleterious material, which affects strength as well as durability of concrete if present in excess. It is acidic in nature and pulls down the PH value of concrete which may result in corrosion of imbedded steel and hamper durability of a structure.

Only 7% chloride content: Presence of excessive chloride content in concrete accelerates corrosion of reinforcement steel. Therefore it is critical to keep chloride content below harmful levels, the limiting value for which is 0.1% by mass in case of reinforced concrete. In Dalmia DSP, the value is in the range of 7-8% of the permissible level, which is why the rate of chloride ion diffusion and carbonation is lower in Dalmia DSP. This significantly enhances protection of embedded steel against corrosion.

Higher Alite (C3S) and lower Celite (C3A): The ideal composition of Dalmia DSP Cement directly enhances the quality and compactness of concrete. Comparatively higher Alite (C3S) is responsible for the early 1 to 7-day compressive strength and low heat of hydration (50-60 cal/gm). It also enables effective resistance against chemical attacks and results in lower water demand, as opposed to cements with higher quantity of Celite (C3A). Dalmia DSP’s value proposition of adding this unique characteristic to cement helps create superior, high-quality and durable concrete.

Zero carbon component: The Slag used in manufacturing Dalmia DSP is sourced from leading and the most reputed steel manufacturers of India. The molten Slag is properly granulated by rapid quenching, making it suitable as an additive to cement. It is ensured that the Slag composition gets transformed into a glassy structure for proper hydraulicity. Slag used in Dalmia DSP has chemical composition very close to that of cement, free from carbon particles unlike PPC cement, which may cause instability in the entrained air content.

High glass content (>90%): Only superior quality Slag, sourced from the best steelmakers of the country, conforming to IS: 12089, is used to produce Dalmia DSP. The very reactive Slag essentially comprises more than 90% glass content with silicates and alumino-silicates of lime. The high alkaline steel Slag (>1.8) in Dalmia DSP ensures higher proportion of reactive minerals.

Corrosion-resistant & water tight concrete: Low-permeability of concrete is a very essential attribute for long-term durability, especially with regard to resistance against corrosion of reinforcement steel. Concrete made with Dalmia DSP is dense and impermeable, with negligible micropores that make it watertight in nature. Low permeability reduces the ingress of harmful substances (such as chlorides and sulphates) and limits availability of water, which would otherwise catalyse harmful chemical reactions within concrete.

Designed for aggressive environments: Dalmia DSP Cement is designed to tackle environmental effects that cause structural instability. With increasing pollution in modern days due to large scale industrialization, it is always advisable to use a blended cement like PSC. Dalmia DSP, due to its inherent characteristics of higher density of concrete and lower reactivity with chemicals and fumes, protects the structures against environmental attacks.

Resistant to ingress of harmful chemical and gases: In Dalmia DSP Cement, calcium hydroxide and tricalcium aluminate are significantly lower than in OPC, which reduces its vulnerability to chemical attacks like sulphate, chloride and reactive silica (present in some aggregates). While PSC is recommended for structures exposed to aggressive and marine environments as per IS: 456 " 2000, the additional CSH formed in concrete made with Dalmia DSP makes the cement paste denser. This results in reduced pore size and lower concrete permeability, often by several orders of magnitude.

Optimal workability: Concrete and mortars made with Dalmia DSP have better workability at a low water-cement ratio. It has more slump retention properties resulting into smooth concrete pours. Enhanced workability and plasticity result in easy placement of concrete in forms and significantly reduces chances of segregation or bleeding.

Brighter finish: Unlike the stony grey colour of concrete made with Portland cement, the lighter color of Dalmia DSP permits architects to achieve a near-white colour for exposed fair-faced concrete finishes, at no extra cost. Dalmia DSP also helps achieve a smoother, more defect-free surface, due to fineness of the GGBS particles. It also attracts less dirt, reduces cost of maintenance, and prevents efflorescence and staining of concrete surfaces by calcium carbonate deposits. The light colour of Dalmia DSP offers the flexibility of adding different additives to produce attractive coloured concrete, as well as imparts better thermal properties to the structure due to higher reflectivity. This keeps the interiors cooler, saving energy and cost of air-conditioning.

Superior particles size distribution: The original size, spatial distribution, and composition of cement particles have a vital role to play in hydration kinetics, microstructure development, and ultimate properties of concrete. While very fine particles have greater tendency to shrink on hydration, resulting in shrinkage cracks, they are also associated with high early heat of hydration, which may results into thermal cracking of concrete or mortar. On the other hand, cement particles larger than 45 microns are difficult to hydrate and those larger than 75 microns may never hydrate completely. Dalmia DSP has a superior particle size distribution (PSD) with an efficient blend of finer and coarser cement particles for quicker rate of gain of early strength and better cohesion in concrete.

Low heat of hydration: Mass concrete applications require limitations on the temperature differential between the surface and concrete core to guard against thermal cracking. In Dalmia DSP Cement, the rate of heat rise in proportion to its quantity in a mixture has been reduced, and so designed as to meet the low heat of hydration requirements for mass applications.

Sustained strength development: Concrete made with superior quality blended cement like Dalmia DSP will go on achieving strength beyond the customary 28 days. Under favourable conditions, it may go on to achieve double the designed strength within a span of 8-10 years.

Tamper and water-proof packaging: Moisture-resistant and damp-proof special packaging of Dalmia DSP with laminated zero bursting sacks can withstand drop test from up to 5 feet. The breakthrough BOPP-laminated packaging is a first-of-its-kind in the industry, and offers more tear resistance and can easily withstand rough handling, humidity, rain, longer periods of transit and a prolonged shelf life.

Well-equipped multi-locational guidance cell: Dalmia DSP’s Customer Care and Guidance Cell, known as TecExpert, offers expert advice and supervision to support and educate customers on various aspects of construction. It is a service initiative from the Technical Services Department (TSD), a team of qualified Civil Engineers, with hands-on expertise in constructing strong and durable structures. The well-equipped multi-locational Cell offers a wide range of value-added services and on-site technical assistance during all phases of construction, including concrete testing, selection and usage of cement and other building materials, and best construction practices, etc. absolutely free of cost. These include:

Pre-sales Service

  • Inspection of form work of roof slab
  • Estimation of raw material
  • Inspection of reinforcement of roof slab

Post-sales service

  • Inspection of roof casting with concrete
  • Propositioning of concrete mixes
  • Mixing of raw material of concrete
  • Transportation of concrete
  • Laying/compaction/finishing and curing
  • Cover blocks

Dalmia DSP - The Greenest Cement

Dalmia DSP Cement utilizes Ground Granulated Blast Furnace Slag (GGBS), a by-product of steel manufacturing process, which otherwise would have to be disposed into the environment. The process is recognized by Leadership in Energy and Environmental Design (LEED) for improving sustainability of a project. Use of GGBS also makes the resultant cement less exothermic, enabling more time for casting of concrete. The utilisation of slag not only lessens the burden on landfills, but also reduces air emission at steel plants through the granulation process. It also directly impacts the environment, by considerably reducing greenhouse gas emissions. For instance, one ton of Slag cement emits approximately one ton of carbon dioxide less than what is emitted by one ton of Portland cement. The manufacturing process also involves 90% less energy consumption to produce one ton of slag cement than to produce an equal quantity of Portland cement.


* All figures stated herein are in reference with IS: 455 - 1989 guidelines


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