If the specific gravity of the material is less than 1, then that material floats in water. The value will change over time if the cement is exposed to various weather conditions. Definition – Specific Gravity is just a comparison between the weight of a volume of a particular material to the weight of the same volume of water at a specified temperature. We hope almost all of us would remember the value as 3.15 (actually 3.12-3.19). This is the main reason behind we reject the old stored cement. (adsbygoogle = window.adsbygoogle || []).push({}); As per Le Chatelier’s Principle, Specific gravity of cement is determined by Le Chatelier’s Flask method. For Instant updates Join our Whatsapp Broadcast. The specific gravity of all other materials are compared to water as a fraction heavier or fraction lighter density, no matter how small or large the fraction is. A number in parentheses indicates the year of Every material has its own specific gravity, and it usually ranges between 0.1 – 100. Portland Cement Association (PCA). Specific Gravity Bottle capacity of 250 ml with stopper. Cement won’t show any reaction when it mixed with kerosene. Next, fill the cement into the flask about 50 gm and note down the weight as W2. The essentialness of specific gravity of cement. 3.15g/cc means the cement is 3.15 times heavier than the water of the same volume. gcement = 3.15 x 62.4 lb/cu ft = 196.56 lb/cu ft Bulk specific gravity of concrete materials Portland Cement 3.15 Pozzolan 2.2 to 2.8 Natural Aggregates 2.4 to 2.9 Water 1.0 We as a whole realize that water cement proportion is a significant factor. gr .= Wc Vc 10. While we are calculating cement for mix design we consider the specific gravity of cement as standard 3.14. While pouring cement in the specific gravity bottle care should be taken to avoid SPECIFIC GRAVITY OF CEMENT Aim :-Determine the specific gravity of given OPC cement sample. prepare (w4 50) gm. Significance of specific gravity of cement Experiment to determine this value What is Specific Gravity of Cement? Aim To determine the specific gravity of cement value Apparatus 1- Le Chaterliers flask 2- Weighing balance and kerosene (free from water). If the value is less than 1, then the material will float on water. 1. 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. What is Specific Gravity? But most of us do not know why we are calculating this value? So, any change in cement specific gravity will affect the mix design. Fineness Test. If you found this article helpful support us by sharing. The specific gravity of Kerosene is 0.79 g/cc The specific gravity of water is 1g/cc. Save our Whatsapp contact +919700078271 as Civilread and Send us a message “JOIN”. By this argument, we can make sure that the same amount of concrete is 3.1-3.16 times heavier than water. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. For example, ammonium nitrate has a specific gravity (sg) of 0.73 while dry ammonium sulphate has a sg of 1.13 (1130 kilograms/cubic meter). It is due to higher specific gravity there would be higher compressive strength of aggregates and hence it passes on to the concrete. To find specific gravity of cement value. While we are calculating cement for mix design we consider the specific gravity of cement as standard 3.14. This standard is issued under the fixed designation C 127; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. This is why you find lots of chunks while mixing old stock cement for concrete. This is why we are insisted on avoiding old stock cement, which may be affected by the external moisture content. (1988). Specific gravity is normally used in mixture proportioning calculations. Kerosene 3. Interested to write an article for Civilread? To get an accurate result, the flask should be held at a constant temperature before each reading is taken. This is because the cement particles essentially constitute of pores that contain water within them. It should be thoroughly dried. The practical will be done within 30° C temperature. Specific Gravity is only an examination between the heaviness of a volume of a specific material to the heaviness of a similar volume of water at a predefined temperature. Importance of Determining Specific Gravity of Cement. ... Care will be taken to avoid splashing and to see that the cement does not adhere to the inside of the flask above the liquid. Why are we calculating this value for cement? Specific gravity test /Density of Cement test : Apparatus Required for Le Chatelier’s Principle:-. 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. You can also follow me on fb and twitter by clicking below. Why..??? Specific Gravity is the ratio of a Weight of Volume of material (Your testing material) to the same Weight of Volume of 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. In Simple – It is a value to calculate whether the material is able to sink or float on water. Also Read: How to find the quality of cement on site? Specific gravity value more than 3.19 indicates that cement was not properly minced into powder form during its production or cement has more moisture content Generally, a nominal mix is prepared with the cement of specific gravity 3.15. if there is any change in this value it will affect the design mix. Absolute Specific Gravity = (Weight of oven-dried aggregate at 100°c for 24 hours) / (Weight of water’s volume equal to that of aggregate’s solids excluding pores) Essential Points Most of the aggregates possess a relative density within 2.4 – 2.9 with a similar particle density about … The relative density (specific gravity) of an aggregate is the ratio between its Mass and the Mass of an equal volume of water. Record the level of the liquid in the flask as initial reading.Put a weighted quantity of cement into the flask so that level of kerosene rises to about 22 ml mark,care being taken to avoid splashing and to see that cement does not adhere to the sides of the flask above the liquid . Cement undergoes a chemical reaction when it is reacted with the atmospheric moisture this process is termed as hydration. In return, We feature your name in author box with your social links. It doesn’t react with cement. The cement particles have pores or particles that can contain water within it. Why are we calculating this value for cement? Weigh the flask with cement and kerosene (W3), Empty the flask. Specific gravity of soil is a very important parameter which is used to determine particle size and void ratio. We calculate Specific gravity to know the behaviour of the material in water. (Weight Specific gravity bottle + cement, note reading).Now add kerosene oil to this bottle and thoroughly mixed no air bubbles should be left and closed the bottleneck with stopper and then weigh and note down reading as W 3. Weighing balance, with an accuracy of 1g. In simple, Cement is 3.10 times heavier than the water. Fineness is the mean size of cement grain. Test Procedure. Founder & Admin of civilread.com, I am a civil engineer working in Ultratech Cement Ltd. With a good subject knowledge in civil engg i have started this blog to share valuable information to fellow civil engineers. Specific gravity is normally used in mixture proportioning calculations. The specific gravity value of portland cement is generally around 3.15 while the specific gravity value of portland-blast-furnace-slag and portland-pozzolan cements may have specific gravities near 2.90. but point no. What is Specific Gravity? SPECIFIC GRAVITY OF CEMENT BY PYCNOMETER METHOD AIM To Determine Specific Gravity Of Cement By Pycnometer Method Equipment: 1. C125 Terminology Relating to Concrete and Concrete Aggregates. We hope that now you have the fair amount of knowledge on the Specific gravity of cement and importance of this test. SPECIFIC GRAVITY OFCEMENT 3.1 AIM: To determine specific gravity of a cement sample by density bottle method. Weighing balance with 0.1 gm accurate. 07. Skip to content. If they do not differ by more than 0.03 g/cm 3, take the average. A good cement should have the Specific gravity of 3.1-3.6 g/cc.Â. In this post, I ‘ll clear all of your doubts regarding the specific gravity of cement. But water reacts with cement and forms calcium oxide. To resolve the specific gravity of cement, kerosene which do not react when mixed with cement is utilized. Simply put, it is a value to compute whether the material can sink or buoy on water. In general, To calculate the specific gravity of material, we use water. If the specific gravity is 3.19, then the pores in cement are filled with the moisture content. Procedure for finding Specific gravity in cement:-. Moisture is a big enemy for cement. 3- Le Generally nominal Mix design is based on the value of specific gravity of cement as 3.15. The reason for finding a lot of lumps in old cement is due to the presence of excessive moisture content in it. The specific gravity of portland cement is generally around 3.15 while the specific gravity of portland-blast-furnace-slag and portland-pozzolan cements may have specific gravities near 2.90 (PCA, 1988 [1]).. Standard Test Methods In the cement concrete, the percentage of voids and the solid volume of aggregates can be calculated with the help of its specific gravity. Specific Gravity of Kerosene = 0.79 g/cc. More are updated Soon!!. Every material has its own specific gravity, and it usually ranges between 0.1 – 100. So that we are using Kerosene. Hence, it is essential to test the specific gravity of the cement procured before the mixing process. Significance of specific gravity of cement, Le-Chatelier Flask capacity of 250 ml or Specific Gravity Bottle / Pycnometer (100 ml), The Flask should be free from the liquid that means it should be fully dry. What is the specific gravity of cement? 3.2 APPARATUS: Specific gravity bottle, kerosene free from water, weighing balance, Constant temperature water bath 3.3 PRECAUTIONS 1. Normally our nominal mix design is based on the value of specific gravity of cement as 3.15. Glass rod Theory: The Pycnometer method can be used for determination of the specific gravity of solid particles . Every material has solid particles and pores which may contain water in it. But the fineness varies in different types of cement. 08. It is directly proportional to workability and the strength of a bonding. Specific Gravity of cement and Test to find it. For example, ammonium nitrate has a specific gravity (sg) of 0.73 while dry ammonium sulphate has a sg of 1.13 (1130 kilograms/cubic meter). The value will change over time if the cement … Usually, the value lies between 3.10 – 3.16 g/cc. In the concrete technology, specific gravity of aggregates is essential in calculation of compacting factor in connection with the workability measurements. As per industry, the acceptable value of specific gravity of cement is up to 3.19. Ensure that the flask is free from dust and impurities. If the specific gravity of cement is greater than 3.19 then, the cement is either not minced finely as per the industry standard or it has more moisture content which will affect the mix and bonding. And the IS code for Specific gravity test is IS 2720- Part 3. If the material has a specific gravity greater than 1, then it sinks in water. Now, weigh the empty flask and note it as, Take 50gm of cement and add it in Flask. Practical relevance:-Specific gravity is defined as the ratio of mass of material to the mass of equal volume of water. The specific gravity of kerosene is 0.79 g/cc. Specific Gravity of Cement is nothing but the ratio between the volume of cement to the volume of the same quantity of water. Determination of the specific gravity of flyash using Le-Chatelier flask, IS 1727:1967, specific gravity of flash, specific gravity of flyash test. Now, take that specific gravity bottle and filled it with 50g cement and closed with stopper then weigh it and note down reading as W 2. This specific gravity of cement ranging from 3.1 to 3.16 g/cc.By this statement, we may ensure that cement 3.1-3.16 times heavier than this water of this same volume, and it sinks in water.. Because the specific gravity isn’t less than 1, every material consists of so many little pores, which can contain voids in it, and the material becomes useless when any void present in the material. Every material has some specific gravity. Specific Gravity of Cement Sg is given by the formula, Here, the specific gravity of kerosene is 0.79g/cc. This is why you find lots of chunks while mixing old stock cement for concrete. The reason behind this, cement hydrates and forms calcium oxide when it reacts with water. Cement 2. 3. ro and 1 ml. Now, take that specific gravity bottle and filled it with 50g cement and closed with stopper then weigh it and note down reading as W 2. The information provided should not be used as a substitute for professional services. Mix thoroughly and see that no air bubbles left in the flask. Difference between OPC and PPC | 16 Differences, Honeycombing in concrete and remedies to prevent it, Concrete Slump test Procedure | Applications | Types | Uses, Compressive strength test on Building materials, Quality check of building materials on site. To wash out the cement and clean the flask use either Kerosene or Naphtha oil. Specific gravity is defined as the ratio between the weight of a given volume of cement and weight of an equal volume of water. Each material has some specific gravity. here are some specific calculation for measuring various type concrete for making home this is nice and good for us . 02. If the cement has already more moisture in it then, the value of water-cement ratio will actually affect the workability and strength rather than increasing it. The specific gravity of all other materials are compared to water as a fraction heavier or fraction lighter density, no matter how small or large the fraction is. But in cement, we use kerosene for finding specific gravity in it. (Weight Specific gravity bottle + cement, note reading).Now add kerosene oil to this bottle and thoroughly mixed no air bubbles should be left and closed the bottleneck with stopper and then weigh and note down reading as W 3. Remove some kerosene from the flask. Design and Control of Concrete Mixtures. If the value is greater than 1, then the material will sink. This is why we are using 0.79 g/cc (specific gravity of kerosene) in our calculation (specific gravity of water – 1g/cc), 3.15g/cc means the cement is 3.15 times heavier than the water of the same volume, This is why we are insisted on avoiding old stock cement. This is the main reason behind we reject the old stored cement. ; Now fill the flask with kerosene up to the top of the bottle. If the cement is exposed to extreme moisture content due to bad weather conditions, then the specific gravity of cement may go up to 3.19. Well most of us know that specific gravity of cement is in between 3.1-3.16 g/cc. Conduct the density determination on two samples of cement. To calculate specific gravity for any material, we have to use water. Specific gravity of cement is tested in order to know the various atmospheric effects on the moisture content of a cement. 4. Density, p = mass of cement/displaced volume. Excessive presence of moisture content in cement effects Workability and strength of cement. Specific Gravity of Cement. In simple words, we are comparing the volume of our Testing material either it may be sand, cement, aggregate with the same volume of water at certain temperature. Please note that the information in Civilology is designed to provide general information on the topics presented. Note down the weight as, Empty the flask and fill the bottle with kerosene up to the tip of the bottle and record the weight as. Normally aggregates are derived from stockpiles, which may be exposed to various conditions. To determine the unit weight of a substance like cement, multiply the specific gravity of the cement by the unit weight of water. If the cement has exposed to extreme moisture content then, the specific gravity of cement will differ because of the moisture content present in the pores. where, Specific gravity of Kerosene = 0.79 g/cc.  Cement becomes useless once it is hydrated with water. Standard Value of Specific Gravity of Cement. Nice information, but i have a question you have stated – pour kerosene in the sample up to the “neck of the bottle” (W3). As already said, the cement may contain lots of moisture content if it is exposed to various conditions and humidity. Cement’s specific gravity varies from 3.1 to 3.16 g / cc. The specific gravity of cement can be calculated as follows: Sp. It is done to measure the mean size of cement grain. How to find the quality of sand on site? Specific gravity of cement indicates the quality of cement, if the specific gravity of cement is other than the standard value i.e. But this value will change with time if the cement is exposed to the different climatic conditions (Due to moisture content). Why is kerosene used in the Specific gravity of cement test? You also have an access to the exclusive Civil Engineering Forum. Based on the moisture content present in the cement, the specific gravity can either increase or decrease. C604 Test Method for True Specific Gravity of Refractory Materials by Gas-Comparison Pycnometer Significance of Specific Gravity of Cement. The error value will be acceptable ±0.01. Why We Calculate Specific Gravity Of Cement: Normally we use nominal mix design based on the specific gravity of cement as 3.14. 11. How to find the quality of cement on site? Specific Gravity of Cement Procedure :- Weigh the empty flask(W1) Fill the flask with water to a specified point (fixed volume) and weigh the flask with water (W2) Remove the water from the flask then fill it with Kerosene to the same specified point (fixed volume) and weigh the flask with the kerosene (W3). While pouring cement in the specific gravity bottle care should be taken to avoid splashing and cement should not … As per IS Cement is re-tested for Specific gravity test if it is three months older. Duplicate determination of specific gravity should agree within 0.01. 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. Density of hydraulic cement is calculated using following formula. The Lechatlier flask should be free from moisture content, that mean flask is thoroughly dried. Particles have pores or particles that can contain water within them feature your name in author with! 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