3501-aggregate-lab-2008 - CGN3501 Civil Engineering...

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CGN3501 Civil Engineering Material Lab Tests on Aggregates used in Portland Cement Concrete 1 Laboratory Exercise #1 Tests on Aggregates Used in Portland Cement Concrete Introduction: Aggregates typically make up 70-80% of the volume of Portland cement concretes and over 90% of asphalt concretes. Thus, their properties (such as gradation, size, shape, pore characteristics, surface traits, and strength) play important roles in determining the properties of the composite materials in which they are to be used. Knowledge of relative density/specific gravity, absorption, unit weight and voids content are necessary for the proper design of both Portland cement and asphalt concretes. Purpose: The purpose of this laboratory exercise is to introduce the student to some of the geometrical and physical properties of aggregates, and to the standard test procedures for these properties. The tests to be run include the following: Fine Aggregate: Sieve Analysis - ASTM C 136 Bulk Specific Gravity (Dry) - ASTM C 128 Bulk Specific Gravity (SSD) - ASTM C 128 Apparent Specific Gravity - ASTM C 128 Absorption - ASTM C 128 Moisture Content - ASTM C 566 Coarse Aggregate: Sieve Analysis - ASTM C 136 Bulk Specific Gravity (Dry) - ASTM C 127 Bulk Specific Gravity (SSD) - ASTM C 127 Apparent Specific Gravity - ASTM C 127 Absorption - ASTM C 127 Moisture Content - ASTM C 566 Dry Rodded Unit Weight - ASTM C 29 Coarse and Fine Aggregates: Standard Practice for Reducing Field Samples of Aggregate to Testing Size - ASTM C 702 University of Florida – Department of Civil and Coastal Engineering
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CGN3501 Civil Engineering Material Lab Tests on Aggregates used in Portland Cement Concrete 2 Part A: Fine Aggregate Sieve Analysis (ASTM C 136) Record all data on Data Sheet, page A-1 Plot results on Gradation Chart, page A-2 1) Obtain approximately 1500 g of fine aggregate from the stockpile. Using the sample splitter provided, reduce the fine aggregate to a sample size of about 500 g. Record the sample size used. 2) Obtain the relevant sieves (3/8", #4, #8, #16, #30, #50, and #100). Clean the sieves of lodged aggregate as much as possible but be careful not to damage the screens. Weigh each of the sieves and the pan individually to the nearest 1.0 g. 3) Nest the sieves in order of descending opening size, placing the pan on the bottom. 4) Place the fine aggregate sample in the top sieve, place lid on top of sieve stack, and agitate for 10 minutes using the mechanical sieve shaker. 5) Carefully remove the sieves one at a time and weigh each sieve with its retained aggregate. Calculate the mass of material retained on each sieve. As a check, compare the total of the retained masses against the original sample mass. The difference should be less than 1.0 g. 6) Calculate the percent retained (based on the total mass from Step 5, not the original sample size), the cumulative percent retained and the percent passing values for each sieve.
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  • Fall '10
  • Mang
  • civil engineering material, Engineering material Lab, Civil Engineering Material Lab, CGN3501 Civil Engineering

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