It is similar in nature to the coarse aggregate specific gravity test. The fine aggregate specific gravity test figure 1 is used to calculate the specific gravity of a fine aggregate sample by determining the ratio of the weight of a given volume of aggregate to the weight of an equal volume of water. Procedure for the determination of specific gravity of fine aggregate. Specific gravity and fine aggregate kit h3373a kit designed to provide you with the major equipment to do specific gravity and absorption of fine aggregate testing. It may be used to calculate the volume occupied by a product whose weight is known, or to calculate the weight of a product from its volume.
Apparatus for determination of specific gravity of fine aggregate. A balance of capacity not less than 3kg,readable and accurate to 0. The relative density specific gravity, a dimensionless quantity, is expressed as ovendry od, saturatedsurfacedry ssd, or as apparent relative density apparent specific gravity. Clean the pycnometer, dry it, find the weight of the pycnometer. Methods of test for aggregates for concrete, part 3. It is similar in nature to the fine aggregate specific gravity test.
Fill the remaining part of pycnometer with distilled water and weight w3. Weight of sample size sample size divided by specific gravity line 2 line 1 weight of pycnometer full of water weight of pycnometer containing sample and water. The ratio of the weight in air of a unit volume of aggregate at a stated temperature to the weight in air of an equal volume. Using the pycnometer a sample of about 1 kg for 10 mm to 475. Experiment 4 specific gravity determination purpose. Mar 09, 2018 specific gravity and water absorption of fine aggregate by pycnometer. Bulk specific gravity also known as bulk dry specific gravity. Specific gravity of fine aggregate can be defined as the ratio of the weight of given volume of coarse aggregate to the weight of given volume of distilled water. Aggregate moisture determination pycnometer jar method. Pycnometer for determination of specific gravity youtube. Determination of specific gravity of fine aggregates using. For aggregates, density is determined by multiplying the relative density specific gravity of the aggregate times the density of water. Specific gravity of soil by pycnometer methodprocedure and. Empty the pycnometer then fill it with water up to the same level.
Mar 09, 2017 2 introduction the coarse aggregate specific gravity test is used to calculate the specific gravity of a coarse aggregate sample by determining the ratio of the weight of a given volume of aggregate to the weight of an equal volume of water. Based on the findings of experiment 2, it was recommended that aashto t 85 be used for measuring specific gravity and absorption of coarse aggregate and the modified aashto t 84 and ssdetect methods be used for measuring specific gravity and absorption of fine aggregate. For some purposes the specific gravity at elevated temperatures is required, as it is not possible to measure this directly an approximate value may be obtained by calculation using the value determined at a lower temperature. Determine the specific gravity of the given soil sample. Pdf standard test method for density, relative density. Coarse aggregate specific gravity pavement interactive. Take about 200gm of coarse aggregate sample in the pycnometer. Determination of specific gravity of fine aggregates the constructor. The formula for specific gravity, given that the reference substance is water, is the density of the object divided by the density of the water. Specific gravity of fine aggregatetest on aggregates. Specific gravity and absorption of fine aggregates aashto t 84 glossary absorption. The coarse aggregate specific gravity test figure 1 is used to calculate the specific gravity of a coarse aggregate sample by determining the ratio of the weight of a given volume of aggregate to the weight of an equal volume of water. If the fineness modulus is constant, the volume of coarse aggregate increase with size of the aggregate, or with the decrease in surface area of the coarse aggregate the main cause in variation in weight of cube found to be specific gravity of coarse aggregate. The bulk density or unit weight of an aggregate is the mass or weight of the aggregate that required to fill a container of a specified unit volume.
The specific gravity is the ratio between the density of an object, and a reference substance. The current method of specific gravity and absorption of coarse aggregate testing is based on the aashto t 85 and astm c127 standards. Determination of specific gravity of fine aggregates. Determination of specific gravity of solids using pycnometer. Immediately after immersion the entrapped air is removed from the sample by shaking pycnometer, placing a finger on the hole at the top of the sealed pycnometer. Specific gravity of soil by pycnometer methodprocedure. California test 226 determination of moisture content by oven drying. Objective specific gravity is defined as the ratio of weight of aggregate to the weight of equal volume of water. Test equipment for determining specific gravity of aggregate. Remove the fine aggregate from the pycnometer and dry to constant mass at a. The increase in mass due to water in the pores of the material.
Determination of specific gravity of coarse aggregate as. This lab is performed to determine the specific gravity of soil by using a pycnometer. Aggregates having low specific gravity are generally weaker than those with high specific. Pycnometer a flask or other suitable container into which the fine aggregate test sample. Differences in specific gravity may be used during production to separate the deleterious particles from the good using a heavy media liquid. Balance having a capacity of at least 5,000 grams, accurate to 0. Geometrical requirement of aggregates as per european standards pdf. Using these three weights and their relationships, a samples apparent specific gravity, bulk. Specific gravity of aggregate test equipment gilson co. Specific gravity of fine aggregate sand is the ratio of the weight of given volume of aggregates to the weight of equal volume of water. Fine aggregate specific gravity sample and pycnometer. Specific gravity is the ratio of the mass of unit volume of soil at a stated temperature to the mass of the same volume of gasfree distilled water at a stated temperature. A twoquart pycnometer is used for coarse aggregates, and a onequart pycnometer is used for fine aggregate. Astm d891 18 standard test methods for specific gravity.
Corresponding coarse aggregate specific gravity and absorption testing, utilizing the appropriate plus no. Drain water from the sample through a filter paper. The specific gravity can tell us, based on its value, if the object will sink or float in our. Improved test methods for specific gravity and absorption of coarse and fine aggregate develops test methods for determining the specific gravity and absorption of coarse and fine aggregates. Specific gravity of coarse aggregate aashto t 85 glossary absorption. Download as doc, pdf, txt or read online from scribd. Series of observation involved in all density bottle, pycnometer and flask are same. Fine aggregate specific gravity pavement interactive. Pdf crushed concrete aggregates cca as fine and coarse. Standard test method for density, relative density specific gravity, and absorption of fine aggregate. Pycnometer a fruit jar supplied with a gasket and conical pycnometer top. Determination of specific gravity of coarse aggregate as per is2386 part3, methodii specific gravity of coarse aggregates by pycnometer method this video is. Specific gravity of soil by pycnometer methodprocedure and calculations the pycnometer is used for determination of specific gravity of soil particles of both fine grained and coarse grained soils.
The specific gravity of sands is considered to be around 2. Water at 270c is filled up in the pycnometer with aggregate sample, to just immerse sample. The determinination of specific gravity of soil will help in the calculation of void ratio, degree of saturation and other different soil properties. California test 206 specific gravity and absorption of coarse aggregate.
This method covers the determination of bulk and apparent specific gravity. Density of aggregate bulk and relative density civil. Pdf design of specific gravity factor of artificial. Specific gravity of fine aggregate sand is the ratio of the weight of given volume of aggregates to the. Now find the mass m4 of the pycnometer having water in it. While doing the concrete mix design, we require values such as specific gravity and water absorption of all the materials used sand, aggregates. Trbs national cooperative highway research program nchrp report 805. The specific gravity of an aggregate is considered to be a measure of strength or quality of the. Fill pycnometer with the liquid as previously and measure the weight m 4. Specific gravity and absorption of fine aggregate nebraska d.
Rinse it once with a liquid whose density you are going to determine next. Dry the coarse aggregate so that it does not absorb moisture otherwise it will not give the desired. Aggregate crushing value crushingtest of coarse aggregate. The specific gravity of an aggregate is considered to be a measure of strength or quality of the material. Read improved test methods for specific gravity and. Water absorption of combined cca using modified pycnometer method.
Take about 500g of sample and place it in the pycnometer. Astmspecific gravity and absorption of aggregate by. The increase in weight due to water contained in the pores of the material. The purpose of this experiment is to determine the following parameters of coarse aggregate. The specific gravity may be expressed as bulk oven dry o. Effect of specific gravity on aggregate varies the weight of. This method applies to coarse aggregate, fine aggregate and combined aggregate this was the only method suitable for measuring combined aggregates. Determining the specific gravities of coarse aggregates. This approach involves the soaking of the coarse aggregate samples for 15h aashto t 85 and 24 4 h astm c127, and drying the aggregate to its saturatedsurface dry ssd state with the aid of a dry absorbent cloth. Standard test method for relative density specific gravity. Determination of specific gravity of coarse aggregate as per is2386 part3, methodii specific gravity of coarse aggregates by pycnometer method this video is a part of our assignment work inner.
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