![]() Specific gravity of the given cement obtained as _. Specific gravity of cement (W1/ W2) : _.Volume of cement particle (V2 - V1) : _ While maintaining AMRL and CCRL accreditation in areas of hot bituminous asphalt pavement, aggregate, soil and Portland cement concrete, our technicians.PROCEDURE A SPECIFIC GRAVITY OF AGGREGATES USING A PYNCNOMETER. The flask is immersed in a constant temperature water bath and the reading is recorded. Test Procedure: The flask is filled with either kerosene free of water, or naphtha having a specific gravity not less than 0.7313 to a point on the stem between zero and 1-ml mark. ![]() Initial reading of flask in ml (V1) : _ This method is also described in Laboratory Test Method 201. Very finely ground cements are likely to have lower specific gravities.Note down the new liquid level as final reading. After putting all the cement to the flask, roll the flask gently in an inclined position to expel air until no further air bubble rise3s to the surface of the liquid.ĥ. Put a weighted quantity of cement (about 60 g) into the flask so that level of kerosene rise to about 22 ml mark, care being taken to avoid splashing and to see that cement does not adhere to the sides of the above the liquid.Ĥ. Record the level of the liquid in the flask as initial reading.ģ. Dry the flask carefully and fill with kerosene or naphtha to a point on the stem between zero and 1 ml.Ģ. Crushed rock and slag shall have at least 75 of the particles by weight with two or more fractured faces and at. Material: Ordinary Portland cement Water Greaseġ. Specific Gravity of Cement As we know that the specific gravity of ordinary portland cement is between 3.1 to 3.15 g/cc and for portland pozzolana cement and portland blast furnace cement it is near to 2. STANDARD LABORATORY CLASSIFICATION TESTS (1). Objective: Determination of specific gravity of cement using Le-Chatelier flash.Īpparatus: Le Chaterliers flask, weighing balance, kerosene (free from water). The specific gravity of OPC is generally around 3.15. To determine the specific gravity of cement, kerosene is used which does not react with cement. Sometimes, a specific gravity bottle may be employed to a standard Le Chatelier’s flask. In case of cement, specific gravity is determined by use of a Le Chatelier’s flask (Figure 3). This is why we need to calculate the correct value of specific gravity of cement before using it in the mix.Theory: Specific gravity is defined as the ratio between weight of a given volume of material and weight of an equal volume of water. Following are the parameters and properties of cement: 1. But if the value is greater than 3.19 it means cement is containing greater amount of moisture content which will affect the workability and strength of concrete. If the cement contains a greater amount of moisture in it then the w/c ratio will definitely affect the workability as well as the strength of concrete.Īs per industry, the acceptable value of specific gravity of cement is up to 3.19. Cement will react with water, so to prevent this reaction kerosene should be used. Because w/c ratio is directly proportional to the workability. The specific gravity of Portland cement is generally about (3.12-3.19). Significance Of Specific gravity Of Cement:Īs we said earlier, cement may contain excessive moisture content if it is exposed to the various weather conditions and we all know that w/c ratio is a big factor which determines the concrete strength. Therefore it is very important to know the specific gravity of cement before using it in the mix. But this value will change with time if the cement is exposed to the different climatic conditions (Due to moisture content). Normally we use nominal mix design based on the specific gravity of cement as 3.14. Whereas for Portland Pozzolana Cements and Portland Blast Furnace Cements, the specific gravity value comes to 2.90 Mg/m3 (As per Portland Cement Association (PCA) 1988). Why We Calculate Specific Gravity Of Cement: The Specific Gravity of Portland Cement ranges from 3.10 to 3.25 Mg/m3, averaging 3.15 Mg/m3. While the specific gravity value of the Portland Pozzolana cement is around 2.90 g/cc. The material will float on water if the value is less than 1 and will sink if the value is greater than 1. Testing of Portland Cement - Determination of Specific Gravity.pptx from ENGINEERIN RELAYING at Southern Luzon State University. According to the Portland Cement Association (PCA), Design and Control of Concrete Mixtures, 1988, the specific gravity of the Ordinary Portland Cement is approximately equal to 3.15 g/cc. Every material has its own specific gravity and the value normally varies from 0.1 to 100. In simple words, the specific gravity determines whether the material will sink or float in water.
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