National academies of sciences, engineering, and medicine. So the determination of specific gravity of fine aggregate is very essential. Chapter 5 practical significance of aggregate specific gravity test results. This standard is issued under the fixed designation c 127. This procedure covers the determination of specific gravity and absorption of coarse aggregate in accordance with aashto t 8514. Pdf determination of specific gravity and water absorption of. Specific gravity relative density of a blended aggregate the specific gravity of a blended aggregate is not simply the weighted average of the specific gravities of the individual components. Specific gravity and water absorption of fine aggregate by pycnometer duration. Bulk specific gravity an overview sciencedirect topics. Specific gravity may be expressed as bulk specific gravity gsb, bulk specific gravity, saturated surface dry gsb ssd, or apparent specific gravity gsa. The increase in mass due to water in the pores of the material. Aggregates having low specific gravity are generally weaker than those with high specific gravity.
Bulk ssd specific gravity for placitas fine aggregate t84 bulk ssd sp gr phunque bulk ssd sp gr 2. 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. This procedure covers the determination of specific gravity and absorption of coarse aggregate in accordance with aashto t 8510. Determining the specific gravities of coarse aggregates. Determining specific gravity of aggregates im 307 iowa dot. Specific gravity of fine aggregatetest on aggregates. Relative density specific gravity is also used in the computation of voids in aggregate in test method c29c29m. Fundamentals of concrete mix design table of contents. Fine aggregate degradation index of aggregate quality. Specific gravity and absorption of fine aggregate nebraska. This method of test covers the procedures for determining the specific gravity and absorption of aggregates. For a particular aggregate type or source, fine aggregate specific gravities can be slightly higher than coarse aggregate specific gravities because as the aggregate particles get smaller, the fraction of pores exposed to the aggregate surface and thus excluded from the specific gravity calculation because they are waterpermeable increases. References california test 201 soil and aggregate sample preparation c.
Coarse aggregate procedure i represents aggregate retained on the no. This method has been designed to eliminate the inherent guess work built into astm c128 and aashto t84 the current cone and tamper methods in use today. It is similar in nature to the coarse aggregate specific gravity test figure 1. Observation table for specific gravity of aggregate finer than 6. Methods of test for aggregates for concrete, part 3. Fine aggregate specific gravity pavement interactive. Fine aggregate specific gravity sample and pycnometer. California test methods version selection caltrans. 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. The specific gravity of aggregates normally used in construction ranges from. Determination of specific gravity of fine aggregates the constructor.
To derive an appropriate equation, lets assume a blend of. The function of the coarse aggregate is to act as the main loadbearing component of the concrete. The current method of specific gravity and absorption of coarse aggregate testing is based on the aashto t 85 and astm c127 standards. Sfn 2199 72019 pit location laboratory number owner project number sampled from pcn type of material submitted by date received. Download a pdf of improved test methods for specific gravity and absorption of coarse and fine aggregate by the national academies of sciences, engineering, and medicine for free. Aggregates having low specific gravity are generally weaker than those with higher specific gravity values. Improved test methods for specific gravity and absorption of coarse and fine aggregate. The fine aggregate serve the purpose of filling all the open space in between the coarse particles. Bulk specific gravity also known as bulk dry specific gravity. The specific gravity of sands is considered to be around 2.
Measurement of water permeability of compacted asphalt paving mixtures. Measuring mortar making properties of fine aggregate. Astm c 17 change in grading resistance to degradation during mixing uncompacted void content workability of fresh astm c 1252 aashto t 304 uncompacted voids and of fine aggregate concrete specific gravity values bulk density mix design calculations. Determination of specific gravity of fine aggregates. Use a sample splitter or quartering cloth to reduce the. Method of test for specific gravity and absorption of fine aggregate. For example, the specific gravity of a dry coarse aggregate gs is 2. Specific gravity of coarse aggregate linkedin slideshare.
As preconized by siddique 2010b, the bulk specific gravity values of the mswi ash ranges from 1. Specific gravity, density, voids, absorption and bulking mechanical properties soundness measuring mortar making properties of fine aggregate alkali aggregate reactivity petrographic examination 0. Specific gravity and absorption of fine aggregate using automatic vacuum sealing corelok method idaho it14408 1 scope 1. This test method describes the procedure used for determining bulk specific gravity saturated surfacedry basis and absorption after prescribed soaking of fine aggregate proposed for use in portland cement concrete. The ratio of the weight in air of a unit volume of aggregate, including the weight of water within the voids filled to the extent achieved.
Specific gravity, density, voids, absorption and bulking. Aggregates having low specific gravity are generally. Fine aggregate is used in many fields in sites for many purposes. Specific gravity and absorption of fine aggregate using. 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. Aashto t84 c128 specific gravity fine aggregate duration. Effect of specific gravity on aggregate varies the weight.
Astmspecific gravity and absorption of aggregate by. Specific gravity and water absorption tests on aggregates. Gsb and absorption are based on aggregate after soaking in. Quantitative determination of asphalt content from asphalt paving mixtures by the ignition method.
Obtain approximately g of aggregate material passing the no. Determining the optimum asphalt binder content of an opengraded friction course mixture using the pie plate method. Test equipment for determining specific gravity of aggregate. State materials office florida department of transportation. This method determines after 15 h in water the bulk specific gravity and the apparent specific. 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. It is the measure of strength or quality of the specific material. Standard test method for relative density specific. The absolute volume of a 90lb sample of the aggregate is. A twoquart pycnometer is used for coarse aggregates, and a onequart pycnometer is used for fine aggregate. North dakota department of transportation, materials and research.
Improved test methods for specific gravity and absorption. Some lightweight shales not used in hma production can have specific gravities near 1. Specific gravities can vary widely depending upon aggregate type. Specific gravity is defined as the ratio of weight of aggregate to the weight of equal volume of water. Ct 207 september 1, 2011 pdf method of test for specific gravity and absorption of fine aggregate this test method is only valid for projects advertised during the period september 2011 through february 2012. A balance of capacity not less than 3kg,readable and accurate to 0.
A weight of empty basket in water a weight of aggregate and basket in water c weight of ovendried aggregate in air. What various tests are done for the water, fine aggregates. Use a sample splitter or quartering cloth to reduce the sample to a. Specific gravity flask for fine aggregate the phunque flask is the key element in a newly developed method for conducting specific gravityabsorption determinations for aggregate.
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