What is specific gravity of slag cement?
2.85 to 2.94
The specific gravity of slag cement ranges from 2.85 to 2.94, depending on the slag source, as compared to 3.15 for portland cement. The difference in specific gravity means a greater volume of slag cement will be used to replace the same mass of portland cement.
What are properties of slag cement?
Properties of these slag cements are broadly similar to those of portland cement, but they have a lower lime content and a higher silica and alumina content. Those with the higher slag content have an increased resistance to chemical attack.
What is specific gravity of cement in kg m3?
The density of cement is 1440 kg/m3 and its specific gravity is around 3.15.
What is specific gravity of OPC cement?
Specific Gravity of OPC
The OPC cement specific gravity is 3.1 to 3.16 g/cc which means cement is heavier than the water of the same volume and it sinks in water.
Why slag is used in cement?
The advantage of slag is its ability to substitute more of cement. Giving savings of up to 9% in cement cost with a 50% slag to cement content ratio. With the combination of both cost savings and strength increase, SCMs such as fly ash and slag should always be considered for certain applications.
What is the difference between OPC and slag cement?
PPC typically uses fly ash (waste generated by coal based power plants) and PSC uses slag generated in blast furnace of steel plants. As per the Cement Users’ Guide of the Indian Concrete Journal, OPC is a product obtained by intimately mixing together calcareous (limestone, chalk, marl etc.)
What is the composition of slag?
It consists primarily of silicates, aluminosilicates, and calcium-alumina-silicates. The molten slag, which absorbs much of the sulfur from the charge, comprises about 20 percent by mass of iron production.
Why is specific gravity of cement?
Limit: Specific gravity of cement = 3.15 g/cc.
Why do we test specific gravity of cement?
The cement particles have pores or particles that can contain water within it. A nominal mix is prepared with a cement of specific gravity 3.15. Any change in this value of specific gravity will affect the mix design. Hence, it is necessary to test the specific gravity of the cement procured before mixing process.
What is the density of OPC 53 grade cement?
3.15 g/cm3
Ordinary Portland Cement (OPC grade 53) manufactured by the Ultratech cement company from Gujarat, having a specific gravity of 3.15 g/cm3, was used.
What is the density of OPC cement?
This means the solid particles of cement themselves have a density of 3150 kg/m3 which is equal to 3.15 grms/ml or 3.15 g/cm3 or 3.15 kg/litre.
Is slag better than cement?
Does slag increase slump?
Slump value for concrete mix using BFS. 0-slag concrete has 7-cm slump, and it is clear that the addition of slag increases the value of slump up to 6 cm. Also, it is obvious by taking slopes for the relation that 21% of slag is optimum for the slump.
Which slag cement is best?
It is created with a combination of upto 45- 50% slag, 45% – 50% clinker, and 3-5% gypsum. PSC has been voted as the most suitable cement for mass construction because of its low heat of hydration.
Which cement is best slag or PPC?
PPC cement is generally used for plastering, brick masonry and waterproofing works. PPC has a lower heat of hydration and it is prone to fewer cracks compared to OPC. PPC has lower strength than OPC but PPC provides better workability and finishing than OPC. PPC provides greater resistance to chemicals.
What is the density of slag?
The density of the synthetic coal slag studied is in the range of ∼2.4 g/cm3 for the temperature range of 1200–1600 °C, in both oxidizing and reducing conditions.
What is the unit of specific gravity?
It has the SI unit kg m-3 or kg/m3 and is an absolute quantity. Specific gravity is the ratio of a material’s density with that of water at 4 °C (where it is most dense and is taken to have the value 999.974 kg m-3). It is therefore a relative quantity with no units.
How do you calculate specific gravity?
Specific Gravity and Density of Mixtures – Fluids Physics Problems
What is the specific gravity of OPC 53 grade cement?
What does 33 43 and 53 grades of cement mean?
By the grade of cement as 33/43/53, the values 33/43/53 indicate the compressive strength of cement cube in Mpa (N/mm2) after 28 days of curing, where cement mould size is 7.06 cm*7.06 cm*7.06 cm. However, it would be good to understand the logic and basis of arriving at such values.
What is density and specific gravity of cement?
If the material has a specific gravity greater than 1, then it sinks in water. We know that specific gravity of cement or Density of cement is ranging between 3.1-3.16g/cc by this, cement is 3.16 times heavier than water of the same volume.
Is slag cheaper than cement?
Slag is similar to fly ash in that it is finer than standard Portland cement and is also cheaper as it is a process byproduct. It is is produced by the steel production industry.
Does slag increase workability?
With increasing the slag %, the workability decreases and reaches a minimum value at 25% slag, then increases again to reach a maximum corresponding to 30% slag addition. It is not known why only after 25% slag addition workability starts to increase.
What are the disadvantages of slag?
Disadvantages of Blast-Furnace Slag Cement
Early Strength is low; therefore, it cannot be used in Reinforced Cement Concrete (RCC) works. As the initial setting time is high, this cement is not used for emergency or repair works.
Is slag cement good for concrete?
Slag cement is most widely used in concrete, either as a separate cementitious component or as part of a blended cement. It works synergistically with portland cement to increase strength, reduce permeability, improve resistance to chemical attack and inhibit rebar corrosion.