This method applies to coarse aggregate, fine aggregate and combined aggregate this was the only method suitable for measuring combined aggregates. If you continue browsing the site, you agree to the use of cookies on this website. Saturated surfacedry ssd, water fills the aggregate pores. Standard test method for relative density specific. Coarse aggregates in this case gravel, are particles that are retained on a sieve number four named according to its openings of 4. No%% if the spparcnt spcci6c gravity oniy ia rcquimd the opaztiom described in 2.
An open graded cold mix is a coarse aggregate mix very small amount of fine aggregate with. Scope a this procedure describes the method which is used to determine the combined coarse and fine aggregate specific gravity and absorption when the specific gravity and absorption of the fine aggregate and the coarse aggregate are known. Pdf design of specific gravity factor of artificial lightweight aggregate. The specific gravity may be expressed as bulk oven dry o. The specific gravity of an aggregate is considered to be a measure of strength or. Specific gravity and absorption of fine aggregate nebraska. Sfn 10081 62019 pit location laboratory number owner project number sampled from pcn submitted by date received.
Evaluation of alternative methods to obtain specific. Effect of specific gravity on aggregate varies the weight. Approximate specific gravities are identified for each source on the departments approvedprequalified materials list. Iowas test method 201b, for specific gravity determinations, requires more time and more care to perform than the aashto procedure. Determination of specific gravity of coarse aggregate as per is2386 part3, methodii specific gravity of coarse aggregates by pycnometer method this video is a. Bulk specific gravity gsb also known as bulk dry specific gravity 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 of gasfree distilled water at a stated temperature figure 2. Bulk specific gravity gsb the ratio of the mass, in air, of a volume of aggregate including the permeable and impermeable voids in the particles, but not including the voids between particles to the mass of an equal volume of gasfree distilled water at a stated temperature. Sfn 2199 72019 pit location laboratory number owner project number sampled from pcn type of material submitted by date received. Determination of specific gravity of coarse aggregate as. The standard sieves for coarse aggregate have openings ranging from 1. The theoretical maximum density, d of mixtures containing coarse aggregate larger than a no. Publication details federal highway administration.
These properties are specific gravity and absorption. Specific gravity of fine aggregatetest on aggregates. North dakota department of transportation, materials and research. Specific gravity and absorption of coarse aggregate.
Cie 309 lab report 1 2 objective the aim of this experiment is to carry out a series of tests in order to determine the basic properties of two construction materials coarse and fine aggregates. Improved test methods for specific gravity and absorption. Request pdf determining the specific gravities of coarse aggregates utilizing vacuum saturation approach the current method of specific gravity and absorption of coarse aggregate testing is. Aggregates having low specific gravity are generally. It is the measure of strength or quality of the specific material. The relative density specific gravity, a dimensionless quantity, is expressed as ovendry od, saturatedsurfacedry ssd, or as apparent relative density apparent specific gravity. The relative density specific gravity of an aggregate is the ratio of. 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. Specific gravity gsb list december 6, 2019 this list supercedes the december 31, 2018 list. Tolerances for the dimensions of openings in sieves are listed in astm e 11 aashto m 92. Astm c127 dry aggregate soak in water for 24 hours decant water use predampened towel to get ssd condition determine mass of ssd aggregate in air determine mass of ssd aggregate in water dry to constant mass determine oven dry mass. So the determination of specific gravity of fine aggregate is very essential.
Specific gravity factor, modified waste eps aggregate, lightweight aggregate. Methods of test for aggregates for concrete, part 3. The coarse aggregate specific gravity test measures coarse aggregate weight under three different sample conditions. Specific gravity of aggregate test equipment gilson co. It is the format for calculating the estimated cost of providing. Open graded mixes the right treatment, to the right road, at the right time. The size, the number, and the continuity of the pores through an aggregate particle may affect the strength of the aggregate, abrasion resistance, surface texture, specific gravity, bonding capabilities, and resistance to freezing and thawing action. This method is not intended to be used with lightweight aggregate. Explain the significance of specific gravity of aggregate. Effect of coarse aggregate size and grouting process on properties of.
X is the aggregate size, g and p stand for gravity process and pumping process respectively, and y is the excessive voidage. Aggregates having low specific gravity are generally weaker than those with higher specific gravity values. January 2015 standard test method for relative density specific gravity and absorption of coarse aggregate. Coarse aggregate specific gravity 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. Aggregates may be broadly classi fied as natural or artificial, both with respect to source and to method of preparation. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to. This technical brief provides an overview of the impacts of aggregate and asphalt mixture specific gravity measurements on asphalt mix design properties and. Bulk specific gravity, in the saturated surface dry condition, must be used to proportion the fine and coarse aggregate. For any pay item less than 500 tons on a contract, no adjustment is made. Natural sands and gravels are the product of weathering and the action of wind or water, while manufactured crushed fine aggregate and crushed stone coarse and fine aggregate are produced by crushing natural stone. Coarse aggregate specific gravity pavement interactive. Specific gravity of fine aggregate test on aggregates september 4, 2017 august 21, 2019 readcivil 0 comments fine aggregate is used in many fields in sites for many purposes. This requirement applies, however, only when gravel coarse aggregates are used in hma, compacted aggregates, and asphalt seal coats except asphalt seal coats used on shoulders. The specific gravity of an aggregate is considered to be a measure of strength or quality of the material.
Aashto has a standard test method for determining the specific gravity of aggregates. Coarse aggregates are divided into classes based on quality requirements as. Astm c12715 standard test method for relative density. Specific gravity is the ratio of the weight of a given volume of aggregate to the weight of an equal volume of water. Standard specifications for road and bridge construction, articles 1020 and 1030 adopted april 1, 2016 notes. Specific gravity is defined as ratio of weight of solid to the weight of an equal volume of gas free distilled water no dissolved airimpurities at a stated temperature. Measuring mortar making properties of fine aggregate. It is similar in nature to the fine aggregate specific gravity test. Specific gravity, density, voids, absorption and bulking. Effect of coarse aggregate size and grouting process on. Determination of specific gravity and water absorption of coarse aggregate. Determining the specific gravities of coarse aggregates.
Quantitative determination of asphalt content from asphalt paving mixtures by the ignition method. The bulk ssd specific gravity and absorption are based on aggregate after 15 to 19 hours soaking in water. Determining the optimum asphalt binder content of an opengraded friction course mixture using the pie plate method. State materials office florida department of transportation. Pdf design of specific gravity factor of artificial. Explain the significance of specific gravity of aggregate kam nai. This standard is issued under the fixed designation c 127. Astmspecific gravity and absorption of aggregate by.
Combined coarse and fine aggregate specific gravity and absorption an arizona method 1. Measurement of water permeability of compacted asphalt paving mixtures. Relative density specific gravity is also used in the computation of voids in aggregate in test method c29c29m. Specific gravity and absorption of coarse aggregate d4pqy60vq6np. Gravel coarse aggregates there is a specific requirement for gravel coarse aggregates regarding crushed particles. Specific gravity and water absorption tests on aggregates. Pdf determination of specific gravity and water absorption of. 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. The people in the aggregate section of the central materials laboratory perform the aashto t85 test for amrl inspections and reference samples.
45 680 209 231 1449 570 1351 168 1442 1506 1472 797 567 782 837 716 1046 1178 13 1369 807 881 1276 1310 339 665 15 933 1005 192 129 450 940 1464