Report To:
Mr. Mark Sider, CET
Civil Engineering, School of Technology
Niagara College Canada
Materials I – CIVL 1256
Lab Report No. 5 # of Parts to Lab 2
Part 1: Bulk Density of Coarse Aggregate
Part 2: Absorption % and Relative Density of Coarse Aggregate
Submitted By:
Section No. 2
Team No. 3
Team Members:
Gio Bernardo, Student No. 4203444, 100%
Boris Kalakovic, Student No. 4204386, 100%
Stephanie Jennings, Student No. 4174304, 100%
Michael Cauwenbergs, Student No. 9609794, 100%
Submission Date:
19/02/2013
1. Introduction:
The density of any material is the mass of a stated volume. It is expressed as pounds per
cubic foot or kilograms per cubic meter. Consistency in aggregate density can be used as an
index of quality. Density is in part influenced by gradation, shape, texture and moisture
conditions.
In aggregates for concrete, the density gives a measure of the voids (spaces) in a unit
volume of aggregate. Below are the three ranges for aggregate groups:
Aggregate Type
Imperial
Metric
PCF
kg/m3
LIGHT WEIGHT
Expanded shale, Slate, Slag
up to 75
up to 1200
REGULAR WEIGHT
Crushed stone, sand, gravel
75 to 11
1200 to 2000
HEAVY WEIGHT
Magnetite, Steel plugs
110 t0 300
2000 to 4600
2. Objective:
The objective of this lab is to:
Bulk Density of Coarse Aggregate using Rodding Method
Find the bulk density of a sample of coarse aggregate using the rodding method.
Bulk Density of Coarse Aggregate using Jigging Method
Find the bulk density of a sample of coarse aggregate using the jigging method.
3. Apparatus:
The apparatus used during this lab were as follows:
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Metal pail
Metal pan
Scoop
Iron rod
Digital scale
Measuring tape
4. Materials:
The materials used in this lab were as follows:
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Coarse aggregate
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5. Procedure:
The procedures used to complete this lab were as follows:
Bulk Density of Coarse Aggregate using Rodding Method
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The empty metal pail was weighed and recorded in the data sheet
The pail was filled 1/3 up with the C.A. (coarse aggregate) and placed on top of
the metal pan
The C.A. was poked using the iron rod without forcibly hitting the bottom of the
pail
The pail was filled up with another 1/3 lift of C.A.
This second lift was rodded while making sure not to penetrate too far into the
first layer of C.A.
1/3 more of C.A. was added to the pail and rodded without piercing into the
previously added layer of C.A.
The pail was filled to the top and the surface was leveled off
The pail filled with C.A. was weighed and recorded in the data sheet
Bulk Density of Coarse Aggregate using Jigging Method
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The same tools from the previous test were gathered to be used
The pail was filled 1/3 up with C.A. and placed on the floor
The pail was tipped so that one side was raised approximately 50mm above the
floor
The pail was released and dropped, hitting the floor sharply
This process (jigging) was repeated 50 times, 25 times for each side
The pail was filled with another 1/3 of C.A.
The jigging process was applied
The pail was filled with the final 1/3 of C.A.
The jigging process was repeated
The pail was filled to the top with C.A. and leveled
The filled pail was weighed and recorded in the data sheet
Calculation for Volume of Pail
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The diameter of the pail was measured at 3 different locations and the depth was
measured at 3 different locations
The measurements were recorded on the data sheet
The pail was left upside-down on the metal pan
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6. Observations:
The observations for this lab were:
DATA SHEET FOR BULK DENSITY
A:
COARSE AGGREGATE - Rodding Method
Mass of rodded aggregate and container
Mass of container
Mass of rodded aggregate
B:
Kg
Kg
Kg
24.350
1.036
23.314
Kg
Kg
Kg
COARSE AGGREGATE - Jigging Method
Mass of jigged aggregate and container
Mass of container
Mass of jigged aggregate
AVERAGE MASS of CA
C:
24.800
1.036
23.764
_23.539_Kg
CALIBRATION OF CONTAINER
Diameter of container ( average of three measurements )
Depth of container ( average of three measurements )
VOLUME OF CONTAINER
BULK DENSITY of CA
((( k/2)2 ) x pi) x l
0.265
0.282
0.016
m
m
m3
(rodding) = 1485 (jigging) = 1457
Average = 1471 kg/m³
7. Conclusions:
The conclusions for this lab are:
With a bulk density of 1471 kg/m³, the sample of coarse aggregate was in the regular
weight range (1200-2000 kg/m³) for aggregate groups.
Signature:______________________
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1. Introduction:
Aggregates are porous, not solid. Water is absorbed in the particles in the pore spaces,
which may be relatively shallow or may extend well into the aggregate particle. The moisture
condition of aggregates can be:
1.
Dry – oven-dry or no moisture content
2.
Saturated, surface dry - all pores filled with water, but no moisture film on the
Aggregate
3. Wet – pores saturated and surface moisture present
2. Objective:
The objective of this lab is to:
Find the relative density and absorption % of Coarse Aggregate.
3. Apparatus:
The apparatus used during this lab were as follows:
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Metal pail
Towel
Digital scales
Sieve
Water bucket
Oven pan
Oven
Metal pan
4. Materials:
The materials used in this lab were as follows:
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1.00kg of coarse aggregate
Water
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5. Procedure:
The procedures used to complete this lab were as follows:
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Approximately 1.00kg of C.A. was soaked in water for 24 hours
The water was poured out into the pail and the aggregate was dried off with the
towel until the surface was free of moisture
The metal pan was dried before replacing the C.A.
The saturated, surface dry C.A. (MSSD) was weighed and recorded
The sieve was filled with filled with the 1.00kg of saturated, surface dry C.A.
The C.A. was lowered into the water bucket and attached to the scale
The weight of the submerged aggregate (MSUB) was recorded
The sieve and wet aggregate were removed from the water
The aggregate was dried off with the towel
The oven pan was weighed
The towel dried aggregate was placed in the oven pan and they were weighed
The pan and aggregate were placed into the oven
The aggregate was left to dry for 24 hours
The bone dry aggregate (MD) and pan were weighed
The weight of the dry aggregate was calculated and recorded
6. Observations:
The observations for this lab were:
Results:
Mass (weight) saturated, surface dry
Mass submerged
Mass dry
980.0 g (MSSD)
990.0 g (MSUB)
959.1 g (MD))
Calculations:
Mass of absorbed water (MSSD-MD)
Volume net (MD-MSUB)
Volume bulk (VN + MWA/1 g/cm3)
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20.9 g (MWA)
30.9 cm3 (VN)
51.8 cm3 (VB)
7. Conclusions:
The conclusions for this lab are:
Relative density and absorption % of Coarse Aggregate
RDA = MD /VN
RDB = MD/VB
RDSSD = MSSD/ VB
Absorption = MWA/ MD
31.0 g/cm3
18.5 g/cm3
18.9 g/cm3
2.18 %
Signature:______________________
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