SOUTHERN LUZON STATE UNIVERSITY (MAIN CAMPUS)
COLLEGE OF ENGINEERING
DEPARTMENT OF CIVIL ENGINEERING
CVE09 – CONSTRUCTION MATERIALS AND TESTING (LAB)
Name: Janella M. Cantara
Date: October 28, 2022
Course, Year, & Section: BSCE III – GA (Structural Engineering)
LABORATORY ACTIVITY NO. 3
SLUMP TEST
OBJECTIVES:
 To determine the strength and consistence of concrete mixture.
 To determine the workability of the fresh concrete before it sets.
 To identify the improperly mixed batch of concrete.
MATERIALS:
 Slump Cone
 Rubber Mallet
 Tamping Rod
 Trowel
 Portland Cement
 Sand (S1)
 Gravel ¾
 Water
CONCRETE DESIGN MIXTURE:
FOR 1 cubic meter of 3000psi CONCRETE
 CEMENT: 9 bags of 40kg CEMENT
 SAND: 820 kg
 GRAVEL 3⁄4: 1004 kg
 WATER: 160 liters
PROCEDURE:
1. Secure slump cone to the base plate using the cone tabs or by standing on the foot holds.
The cone MUST remain still throughout the test.
2. Using the scoop, fill 1/3 of the cone with the concrete sample.
3. Rod the material 25 times with the steel tamping rod, taking care to distribute rodding
evenly over the entire cross-section of the sample. While rodding, you may touch but do
not hit or “thump” the base plate.
4. Fill the cone to 2/3 full.
5. Rod the second layer 25 times, making sure to penetrate the previous layer by about an
inch. Continue rodding in a circular fashion, working to the middle—the same pattern as
discussed in step 3.
6. For the final layer, fill the cone to slightly overflowing.
SOUTHERN LUZON STATE UNIVERSITY (MAIN CAMPUS)
COLLEGE OF ENGINEERING
DEPARTMENT OF CIVIL ENGINEERING
CVE09 – CONSTRUCTION MATERIALS AND TESTING (LAB)
7. Rod the final layer 25 times with rod penetrating, but not through, the second layer.
Distribute rodding evenly over the entire cross-section of this layer. If the mounded
material sinks below the lip of the mold, stop rodding, refill, then continue rodding, picking
up where you left off in the 25 strokes count.
8. Strike off the excess concrete from the top of the cone, using the tamping rod as a screed
in a rolling or sawing motion.
9. Clean excess concrete overflow from the base of the cone. Use caution to avoid disturbing
the cone during this process.
10. Holding the cone firmly, unlock or step off the cone tabs. Slowly lift the cone vertically in
a steady motion, without any rotational movement, straight up to clear the sample. The
lifting action should take 5 to 10 seconds.
11. Invert the cone mold—small side down—and set it next to, but not touching, the concrete
sample on the base.
12. Place a straight edge, preferably the tamping rod, across the slump mold base, with one
end suspended over the pile of concrete. Using a tape or ruler, measure the distance from
the bottom of the straight edge to the displaced center of the slumped concrete. Record
your results to the nearest 1/4 of an inch.
OBSERVATION / TABLE:
SAMPLE
CEMENT
SAND
GRAVEL (G ¾)
WATER
NO.
(KG)
(KG)
(KG)
(LTRS)
1
3.6
8.2
10.04
1800
SLUMP
ZERO SLUMP
(1.5 cm)
2
3.6
8.2
10.04
1900
SHEAR SLUMP
(15 cm)
3
4.1
8.2
10.04
1900
TRUE SLUMP
(8 cm)
PICTURES:
SOUTHERN LUZON STATE UNIVERSITY (MAIN CAMPUS)
COLLEGE OF ENGINEERING
DEPARTMENT OF CIVIL ENGINEERING
CVE09 – CONSTRUCTION MATERIALS AND TESTING (LAB)
RESULTS:
Sample No. 1 – Zero (1.5 cm)
Sample No. 2 – Shear (15 cm)
Sample No. 3 – True (8 cm)
CONCLUSION/S:
Sample no. 1 shows zero slump as a result, using 3.6 kg of cement, 8.2 kg of sand, 10.04
kg of gravel, and 1.8 liters of water. Sample no. 2 shows shear slump as a result, using 3.6 kg of
cement, 8.2 kg of sand, 10.04 kg of gravel, and 1.9 liters of water. Sample no. 3 shows true slump
as a result, using 4.1 kg of cement, 8.2 kg of sand, 10.04 kg of gravel, and 1.9 liters of water. We
concluded that the results in slump test are based on the water that is used, the moisture content in
the sand, and the amount of the mixture of particles.
Therefore, the higher the water contents in the concrete, its mean higher the workability
but lower the strength of the concrete. If the cement content is higher, the workability also become
higher. The good mix particles, particle shape and size are cubical or rounded, the workability also
become high.