lab 5

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Seneca College *

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241

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Industrial Engineering

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Jun 13, 2024

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docx

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8

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MTR241-NJJL WINTER 2019 Lab Report No. 5 RELATIVE DENSITY AND ABSORTION Date: February 13 th , 2019. 1 | P a g e
MTR241-NJJL WINTER 2019 Lab Report No. 5 RELATIVE DENSITY AND ABSORTION Purpose The purpose of this analysis was to determine the Apparent Relative Density (RD A ) , Saturated Surface-Dry Relative Density (RD SSD ) and Bulk Relative Density (RD B ) of the given aggregate sample. The provided sample’s absorption properties (% Absorption) was also determined during this analysis. Procedure Step 1: Retrieve approximately 2 kilograms (2000grams) of aggregate sample and measure its Submerged Mass (M SUB ) - 2 scoops of aggregate sample were retrieved from the wet aggregate container. - Sample was placed in mesh container and submerged in water. - Submerged mass of the sample was measured using the digital scale. Digital scale indicated a mass of 1200 grams . Step 2: Obtain the Saturated Surface Dry Mass (M SSD ) of the sample - The sample was extracted from water after Step 1. - Aggregate samples were spread out on dry cloth provided by Seneca College. The moisture film (wet external surface) of the aggregates was dried, whilst the pores were filled with water. - Saturated surface dry mass (M SSD ) of the sample was measured using the digital scale. The digital scale indicated a mass of 1915.62 grams . 2 | P a g e
MTR241-NJJL WINTER 2019 Step 3: Obtain the Dry Mass (M D ) of the sample - Sample was placed in the oven and dried overnight at 110 0 C. - Dry Mass (M D ) of aggregate sample was obtained 24 hours later. Mass of 1905.65 grams was posted outside Room A3085 at Seneca College. Step 4: Calculate the Net Volume (V N ) , Mass of Absorbed Water (M WA ) , Bulk Volume (V B ) , Apparent Density (RD A ) , Saturated Surface Dry Density (RD SSD ) , Bulk Density (RD B ) , and Percent Absorption (% Absorption) of the aggregate sample. Sample Description Provided aggregate sample had a dark grey colour with white/light grey steaks. The aggregate sample had a blocky irregular shape with an angular angularity. The sample contained aggregates bigger than 4.75 mm. Aggregates had a hardness of greater than 5, according to the Mohs scale. Sample had a rough texture. 3 | P a g e
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MTR241-NJJL WINTER 2019 Data Data collected during this analysis are shown below in ( Data Table ) . Data Table Group Number Group 5 Container Mass 223.73 g Saturated, Surface Dry Mass (M SSD ) 1915.62 g Submerged Mass (M SUB ) 1200 g Dry Mass (M D ) 1905.65 g Original Data recorded during this analysis can be found in Appendix 1. Please refer to Appendix 1. Calculations Calculations performed during this analysis can be found in Appendix 2. Please refer to Appendix 2. Formulas used for calculations during this analysis are shown below. Net Volume ( V N ) = Dry Mass ( M D ) Submerged Mass ( M ¿ ) Mass of Absorbed Water ( M WA ) = Saturated, Surface Dry Mass ( M SSD ) Dry Mass ( M D ) Bulk Volume ( V B ) = Net Volume ( V N ) + Massof Absorbed Water ( M WA ) Apparent Relative Density ( RD A ) = Dry Mass ( M D ) Net Volume ( V N ) x ( 1 g / cm 3 ) Satured, Surface Dry Relative Density ( RD SSD ) = Saturated, Surface Dry Mass ( M SSD ) Bulk Volume ( V B ) x ( 1 g / cm 3 ) Bulk Relative Density ( RD B ) = Dry Mass ( M D ) Bulk Volume ( V B ) x ( 1 g / cm 3 ) Percent of Absorption = Mass of AbsorbedWater ( M WA ) Dry Mass ( M D ) x 100 4 | P a g e
MTR241-NJJL WINTER 2019 Results Results obtained during this analysis are shown in ( Results Table ) below. Results Table Net volume (V N ) 705.65 cm 3 Mass of Absorbed Water (M WA ) 9.97 g Bulk Volume (V B ) 715.62 cm 3 Apparent Relative Density (RD A ) 2.7 Saturated, Surface Dry Relative Density (RD SSD ) 2.67 Bulk Relative Density (RD B ) 2.66 Percent of Absorption 0.52% Specifications Conclusions: N/A Recommendations: N/A 5 | P a g e
MTR241-NJJL WINTER 2019 APPENDIX 1 DATA 6 | P a g e
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MTR241-NJJL WINTER 2019 Lab Report No. 5 RELATIVE DENSITY AND ABSORTION Data Original data was obtained on February 6 th , 2019. Data collected during this analysis is shown in ( Figure 1 ) below. ( Figure 1- Original Data ) 7 | P a g e
MTR241-NJJL WINTER 2019 8 | P a g e