Lab 1

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Apr 3, 2024

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CE 3700 Engineering Materials Laboratory Experiment 1: “Aggregate Sieve Analysis” & Experiment 2: “Aggregate Specific Gravity and Absorption Tests” Performed By: Chrisotpher Issa Section 2 Group 1 Date Performed: 08/24/2023 & 08/31/2023 Date Submitted: 9/14/2023 Department of Civil and Environmental Engineering Louisiana State University Fall 2023 1

Purpose Sieve Analysis for Coarse Aggregates: The purpose of this test was to determine the distribution of different particle sizes of coarse aggregates. A group of sieves, in varying sizes in order from largest to smallest, was used to sift dry aggregate through each size to capture the corresponding particles on each sieve. The amount of aggregate on a certain sieve established those particles’ sizes and were weighed to compare amounts of aggregates captured on each sieve size. Aggregate Specific Gravity and absorption tests: One purpose of this test was to find the average densities of a group of fine and coarse aggregates while trying to eliminate any volume that is not directly from an aggregate such as the empty space between particles. Another purpose is to find the relative density or specific gravity of the aggregates. The last purpose is to find the varying absorptions of the coarse and fine aggregates. Significance and Use Sieve Analysis for Coarse Aggregates: Performing a sieve analysis for coarse aggregates helps provide the data for the contents of mixtures. Mixtures can be more easily identified and organized by measuring the particle size distribution that make them up. This can allow for meeting more specific safety standards and requirements as well as simply reaching a desirable mixture needed for a certain task. Being able to find out and control the different sizes and amounts of particles in coarse aggregates allows for more efficient and successful mixtures. Aggregate Specific Gravity and Absorption Tests: Finding the relative density and knowing the specific gravity of an aggregate can be helpful in determining the volume of aggregates in mixtures as well as the volume of the empty spaces between aggregate. The weights of the aggregates found give a comparison to the volume of a unit weight of water. This will be able to help find more accurate weights of aggregates at dry and SSD condition, especially finer aggregates. Finding the absorption rates allows us to find the amount of water a coarse aggregate can hold in it’s pores when it is in SSD condition. Apparatus / Equipment Sieve Analysis for Coarse Aggregates:  Scale  Pan 2

 Sieves – sizes (mm) 37.5, 25.0, 19.0, 12.5, 9.5, 4.75, 2.36, 1.18, 0.6, 0.3, 0.15, 0.75, and pan  Mechanical Sieve Shaker (Mary Ann)  Oven Aggregate Specific Gravity and Absorption Tests:  Scale  Pycnometer  Flack  Mold and Tamper  Oven  Water tank  Towel Test Specimen / Sample Sieve Analysis for Coarse Aggregates: The materials used in this experiment were limestone and sand aggregate. The initial weight for the compound used was 310.5 grams. After washing the aggregate, there was 299.5 grams remaining. The ASTM standards required 300 grams. There is a 0.5 gram deviation. Aggregate Specific Gravity and Absorption Tests: The materials used in this experiment included 2447.9 grams of granite from Nova Scotia for the coarse aggregates as well as 499.5 grams of sand from the Amite River as the fine aggregate. The amount of sand is a deviation since the ASTM standards need 1000 grams. Test Procedure Sieve Analysis for Coarse Aggregates: The sample was initially dried then weighed on the scale. The sieves were stacked in descending order with the sieve with the largest holes on top to the pan at the very bottom. The aggregate was poured onto the first sieve and the stack was put into the sieve shaker. The recommended time was 10 minutes by ASTM standards, but the shaker was set to 5 minutes for this experiment which is another deviation. Aggregate Specific Gravity and absorption tests: Granite was fully submersed in water for 24 hours prior to the experiment allowing the pores to be fully saturated. The granite was taken out of the water and dried with a towel until the surface looked dull showing it has been surface dried. The coarse aggregate was weighed, and the volume of the sample was found by measuring the displacement of the water. The granite was then oven dried in the oven with the final weight of the sample compared to the initial weight. With this information, the relative density (specific gravity) and absorption was found (Table 3,4, and 5 ). 3

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