CE 337 LAB FINAL QUESTIONS AND CORRECT
ANSWERS
LAB 1 CONCEPTUAL GUIDE - Answers - Determination of coarse and fine aggregates
physical properties
What is the difference between coarse and fine aggregates? - Answers - - Aggregates
that pass through the 4.75 mm sieve (#4 sieve) are defined as fine aggregate
Unit weight = Coarse aggregate
Specific gravity =
- Coarse aggregate
- Fine aggregate
What is the difference between specific gravity and unit weight? - Answers - - Specific
Gravity is a ratio of the density of a substance to the density of a standard substance,
usually water
* Water = 1
* Cement = 3.15
* Asphalt cement = marginally greater than 1
* Aggregates = 2.30-2.90 (2.50-2.80)
- Unit Weight
Practical use of unit weight and specific gravity is: - Answers - Specific Gravity -
Determines soil load bearing capacity
Computation of the unit weight and void ratio for the coarse aggregate - Answers - *
Calculations*
Computation of specific gravity of fine and coarse aggregate - Answers - * Calculations
*
Determination of the specification compliance of the computer physical properties of the
fine and coarse aggregate sample - Answers - ASTMs:
ASTM C29 - Bulk Density (Unit Weight) and Voids in Aggregate
AASHTO T19 - Bulk Density (Unit Weight) and voids in aggregate
ASTM C127 and C128 - Specific gravity of coarse and fine aggregates
, AASHTO T84 and AASHTO T85 - specific gravity of coarse and fine aggregates
States of aggregates
Oven-Dry (OD)
Saturated Surface Dry (SSD) - Answers - Oven-Dry (OD) -
Related to aggregate particles, the condition in which the aggregates have been dried
by heating in an oven at 110 +- 5 degrees C for sufficient time to reach a constant mass
(Wod)
Saturated-Surface-Dry (SSD) -
Related to aggregate particles, the condition in which the permeable pores of aggregate
particles are filled with water to the extent achieved by submerging in water for the
prescribed period of time, but without free water on the surface of the particles (Wssd)
ASTM Designations LAB 1 - Answers - ASTM C29 - Bulk Density (Unit weight) and
Voids in aggregate
ASTM C127 and C128 - Specific Gravity of coarse and fine aggregates
Equipment Lab 1 - Answers - - Balance
- Tamping rod
- Metal bucket of known volume
- Adequate amount of aggregate sample to perform all the tests
- Scoop or shovel
- 1000ml Flask
- Stopper
- Funnel
- Conical sheet metal brass mold
Purpose of Lab - Answers - Test methods address coarse and fine aggregate physical
properties
Specific Gravity - Fine Aggregate - Answers - - If aggregate is wetter than SSD
condition, the material will retain the molded shape
- If the aggregate is drier than the SSD condition, the material does not maintain any
molded shape (If aggregate is dried past SSD condition, add water, cover and allow to
stand for 30 minutes before conditioning)
- At SSD condition, the material slumps slightly (materials with a high percentage of
fines may slump on one side)
LAB 2 - Answers - Moisture States of Fine Aggregates
Different Moisture States of fine aggregate and coarse aggregate - Answers -
ANSWERS
LAB 1 CONCEPTUAL GUIDE - Answers - Determination of coarse and fine aggregates
physical properties
What is the difference between coarse and fine aggregates? - Answers - - Aggregates
that pass through the 4.75 mm sieve (#4 sieve) are defined as fine aggregate
Unit weight = Coarse aggregate
Specific gravity =
- Coarse aggregate
- Fine aggregate
What is the difference between specific gravity and unit weight? - Answers - - Specific
Gravity is a ratio of the density of a substance to the density of a standard substance,
usually water
* Water = 1
* Cement = 3.15
* Asphalt cement = marginally greater than 1
* Aggregates = 2.30-2.90 (2.50-2.80)
- Unit Weight
Practical use of unit weight and specific gravity is: - Answers - Specific Gravity -
Determines soil load bearing capacity
Computation of the unit weight and void ratio for the coarse aggregate - Answers - *
Calculations*
Computation of specific gravity of fine and coarse aggregate - Answers - * Calculations
*
Determination of the specification compliance of the computer physical properties of the
fine and coarse aggregate sample - Answers - ASTMs:
ASTM C29 - Bulk Density (Unit Weight) and Voids in Aggregate
AASHTO T19 - Bulk Density (Unit Weight) and voids in aggregate
ASTM C127 and C128 - Specific gravity of coarse and fine aggregates
, AASHTO T84 and AASHTO T85 - specific gravity of coarse and fine aggregates
States of aggregates
Oven-Dry (OD)
Saturated Surface Dry (SSD) - Answers - Oven-Dry (OD) -
Related to aggregate particles, the condition in which the aggregates have been dried
by heating in an oven at 110 +- 5 degrees C for sufficient time to reach a constant mass
(Wod)
Saturated-Surface-Dry (SSD) -
Related to aggregate particles, the condition in which the permeable pores of aggregate
particles are filled with water to the extent achieved by submerging in water for the
prescribed period of time, but without free water on the surface of the particles (Wssd)
ASTM Designations LAB 1 - Answers - ASTM C29 - Bulk Density (Unit weight) and
Voids in aggregate
ASTM C127 and C128 - Specific Gravity of coarse and fine aggregates
Equipment Lab 1 - Answers - - Balance
- Tamping rod
- Metal bucket of known volume
- Adequate amount of aggregate sample to perform all the tests
- Scoop or shovel
- 1000ml Flask
- Stopper
- Funnel
- Conical sheet metal brass mold
Purpose of Lab - Answers - Test methods address coarse and fine aggregate physical
properties
Specific Gravity - Fine Aggregate - Answers - - If aggregate is wetter than SSD
condition, the material will retain the molded shape
- If the aggregate is drier than the SSD condition, the material does not maintain any
molded shape (If aggregate is dried past SSD condition, add water, cover and allow to
stand for 30 minutes before conditioning)
- At SSD condition, the material slumps slightly (materials with a high percentage of
fines may slump on one side)
LAB 2 - Answers - Moisture States of Fine Aggregates
Different Moisture States of fine aggregate and coarse aggregate - Answers -
