ECI-135: CONCRETE LABORATORY
Assuming a mix proportion of 1:2:3 by weight
1 Flexural Beam (Beam Dimensions: 4 x 6 x 80 in)
Volume required for 1 beam ≅ 1.25 cu ft
1 Shear Beam (Beam Dimensions: 4 x 6 x 40 in)
Volume required for 1 beam ≅ 0.65 cu ft
Volume of two 6x12 cylinders for split-cylinder test ≅ 0.5 cu ft
Volume of two 4x8 cylinders for compression test ≅ 0.15 cu ft
TOTAL VOLUME FOR EACH BATCH ≅ 2.55 cu ft
Approximate weight of concrete = 150 lb / cu ft
Required weight per batch = 150 x 2.55 = 380 lb
Given 1:2:3 mix proportion by weight
Required quantity of cement = (1/6) x 380 = 63.5 lb
Required quantity of sand = (2/6) x 380 = 127 lb
Required quantity of stone = (3/6) x 380 = 190 lb
Water (assuming w/c ratio of 0.55) = 34 lb
NOTE: EACH GROUP MAY HAVE USED A SLIGHTLY DIFFERENT MIX
PROPORTION. PLEASE REPORT THE CORRECT VALUES FOR YOUR GROUP
PROCEDURE FOR PREPARING CONCRETE
1. Weigh out proportions for given mix
2. Divide coarse aggregate into 2 parts
3. Divide sand into 2 parts
4. Prepare the concrete mixer by wetting it with a mixture of cement, sand and water
5. Divide water into 2 buckets
6. Put half coarse aggregate into mixer
7. Add 1 bucket of water
8. START MIXER
9. Carefully add all the cement while the mixer is running (a little at a time to avoid dust
10. Run mixer for a few minutes until all the cement is blended.
11. Add remaining stone and sand
12. Keep adding water until a workable mix is achieved.
Don’t add all the water unless mix is still unworkable.
13. Water reducing agents (superplasticizer) are added at this stage, if necessary
14. Mix for at least 3-5 minutes after all ingredients have been added
15. Perform a slump test.
If slump is less than 3”, add more water/admixture.
Notes on slump test: Dampen the mold; Place on a flat moist surface; Fill a third of the
volume, and rod the layer with 25 even strokes; Fill to two-thirds the volume and rod
once again with 25 strokes; fill the mold and repeating rodding procedure; strike off top
surface and remove mold carefully in vertical direction and place it beside the slumping
concrete. Measure slump.
Casting cylinders: Use procedure similar to slump test; fill cylinder a third of the volume
each time and rod with 25 strokes; before adding concrete each time, tap the sides of the
mold several times to drive out air bubbles; Cover cylinders with plastic bag.
NOTE: MARK CYLINDERS (WRITE BATCH #)
ECI 135: LAB GROUP ASSIGNMENTS
BATCH A BATCH B
Group 1: Group 1:
Gonzales, Janette Mae C. Arani, Pedram M.
Benson, Amy B. Matusek, Alexis C.
Esparza, Emiliano L. Brown, Nicholas J.
Do, Hoan L.
Nguyen, The T.
Ahmadi, Mohammad Y.
Gebremedhin, Samuel A.
Nino, Vanessa M.
Estrada, Avery M Group 3:
Pack, Andrew J. Lott, Abayomi J
Waller, Jack T. Hirneise, Grant D.
Alberto Rosales, Carlos A.
Hafez, Omar M. Group 4:
L'Amoreaux, Philip M Chi, Yu - Wen
Burns, Joseph Liea, Bogdan I.
Huang, Joseph H.
Masulis, Arlen C. Group 5:
Ng, Alan J. Bardet, Eric C.
Ng, Brian C. Miao, Yi-Li E.
Stanger, Brett R.
Birnbaum, Edward L.
Capsuto, Ian R.
Yoon, Ho Hyun
Biksa, Karlis J.
Kao, Jane Y.
Stublarec, Jason M.
Chou, Ray H.
Palmeno, Ulises E.
Penney, William F.
Szkup, Elliot G.
Nguyen, Thinh D.
1. Designate a team leader
2. Assign responsibility to each team member
• Team Leader: Compression and Tension tests, team coordination
and compilation of report
• Team Member 2: Flexure and Shear Tests
• Team Member 3: Deflection Analysis
ALL TEAM MEMBERS MUST WORK TOGETHER
3. Report should contain the following:
1) TITLE PAGE (list group members on this page)
2) Table of Contents
3) Chapters organized as follows:
II. Concrete Mix and Specimen Preparation
III. Material Properties (include results of compression & tension
IV. Flexural Tests
V. Shear Tests
Chapters IV - VI should contain the following:
- Objective of test
- Testing (procedure and observations)
- Experimental results
- Analysis (theory and calculations)
- Comparison of experiment vs. analysis
- Conclusion (sources of error)
NOTES: Draw neat sketches and use photographs (when appropriate) to
describe experimental setup. Plot your results where possible.
All students in a group will receive same score unless a section is incomplete or
poorly written (and team leader confirms that the student did not do his/her
share of work) in which case the student responsible for that section will receive
a different score.