Lab2 Handout

8/10/2019 Lab2 Handout

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UNIVERSITY OF CAPE TOWN, DEPARTMENT OF CIVIL

CIV2037F

Experiment 2

Title: Concrete compressive strength

Experiment objectives

(i) Expose students to testing concrete(ii) Identity the critical factors that affect concrete compression strength.

(iii)Perform statistical analysis of data , use TWO FACTOR ANOVA to screen factors and

investigate interactions if any.

(iii) Report writing

BackgroundConcrete is a mixture of cement, sand, stone (aggregate) and water. The compressive strength

depends on many factors and this experiment will provide a hands on practice on factor

screening. This experiment focuses on just two which are water cement ratio and binder type.

A number of concrete cubes have been cast using two water cement ratios of 0.4 and 0.55,

two binder types 50/50 OPC/GGBS and 100% OPC.

The concrete cubes have been cured for a period of 13days. The general testing procedure is

attached. You will be expected to do the labs in groups and due to limitations of space; each

group will have 20minutes for the lab. Please check the attached groups for the lab times

for your group. Note that the whole dataset for the whole testing wil l be used for your

report.

Uncertainty analysis(c) State the instrument resolutions for devices in your experiment. [1]

(d) Using dimensions from a single experimental unit and crushing load, calculate theuncertainty in the compressive strength [2]

Descriptive statisticsFor each set of results;

(e) Perform numerical summaries of compressive strength for each treatment (the summaries

should include mean, range and standard error.[3]

(f) Plot comparative box plots for the treatments. Are there any outliers? If so what are the

possible reasons for the outliers?[4]

Experiment design

(a) Identify at least 3 control factors in this experiment that affect compressive strength. [3](b) Identify the different treatments applied in the experiment. [2]

Inferential statistics [6marks](g) Does the additive model hold for this experiment?

*** Depending on the outcome in (g) either check the main effects hypothesis in (h and i) or

make a table of means

(h) Is there any evidence that compressive strength of concrete is influenced by w/c ratio?

(i) Is there evidence that compressive strength is influenced by the binder type?

[Assume 5% significance level in your ANOVA]


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CIV2037F

Group

W/C

ratio Binder type Number of Time

specimen

A 0.55 100 OPC 3 14:00

0.4 100 OPC 3

B 0.55 50/50OPC/GGBS 3 14:15

0.4 50/50 OPC/GGBS 3

C 0.55 100 OPC 3 14:30

0.55 50/50 OPC/GGBS 3

D 0.4 100 OPC 3 14:45

0.4 50/50 OPC/GGBS 3

E 0.55 100 OPC 3 15:00

0.4 100 OPC 3F 0.55 50/50 OPC/GGBS 3 15:15

0.4 50/50 OPC/GGBS 3

Note:Marks are indicated in brackets and then summed in relevant sections as shown general

marking scheme. Page 3 of this hand-out MUST be attached in your report just after the title

page.

Report: Due 02ndMay 2013 for the first lab session. All submissions will be hard copy.


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CIV2037F

General marking scheme:

Title Page 1mark______

Summary(Abstract) 3marks______

Main BodyIntroduction 2marks_______

Methodogy (including experiment design aspects) 7marks________

Results, (summary statistics, uncertainty analysis, ANOVA) 16marks_______

Discussion 3marks________

Conclusions 2marks________

Reference List 2marks________

Appendices (Raw data and sample calculations) 2marks________

TOTAL _______/38

In each section marks will be awarded on the basis of your understanding of the

problem, application of statistics, uncertainty and communication skills (format, layout,

spelling and grammar)

TITLE PAGEThe title page should include your name, student number, title of your project,

submission date, name of course and name of lecturer.


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CIV2037F

General marking scheme:

Title Page 1mark______

Summary(Abstract) 3marks______

Main BodyIntroduction 2marks_______

Methodogy (including experiment design aspects) 7marks________

Results, (summary statistics, uncertainty analysis, ANOVA) 16marks_______

Discussion 3marks________

Conclusions 2marks________

Reference List 2marks________

Appendices (Raw data and sample calculations) 2marks________

TOTAL _______/38

In each section marks will be awarded on the basis of your understanding of the

problem, application of statistics, uncertainty and communication skills (format, layout,

spelling and grammar)

TITLE PAGEThe title page should include your name, student number, title of your project,

submission date, name of course and name of lecturer.


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Name Student number Group Signature

Abrahams, Tohir abrtoh003

Bukasa, Deogracia bksdeo001

Dunnell, Helen dnnhel001

Gaszynski, Chris gszchr001

Holmes, Matthew hlmmat002

Kok, Kevin kkxkev001

Mabaso, Sibusiso mbssib005

Appolus, Michael appmic005

Chitate, Nyasha chtnya003

Earl, Andrew erland002

Gihwala, Manoj ghwman001

Hurworth, Nick hrwnic003

Kvammen, Andreas kvmand001

Macfarlane, Andrew mcfand005

Baker, Jordan bkrjor001

Coetzee, Joshua ctzjos002

Eksteen, Ebrahim eksebr001

Givah, Chisomo gvhchi001

Jeena, Priyal jnxpri001

Lall Mahomed, Zubair lllmuh002

Magadlela, Khululekani mgdkhu003

Blair, Kelly blrkel002

Colombo, Roberto clmrob005

Etienne, Mikael dzreti001

Grosse - Weischede, Bern grsfri001Jhamba, Leonel jhmleo001

Lebea, Itumeleng lbxitu001

Mahlangeni, Lutho mhllut003

Blaker, Byron blkbyr001

De Waal, Lauren dwllau001

Fick, Andree fckand002

Heath, Jack hthrob004

Kalmo, Mari klmmar003

Lejake, Tebaco ljkteb001

Mapulanga, Perry mplemm002

Boyjonauth, Nikhil nkhboy001

Dipela, Sello dplsel001

Fry, Anthony fryant001

Hill, Tracey hlltra004

Kimathi, Linet kmtlin002

Likhade, Rendani lkhren001Martinez, Felix mrtfel001

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Lab2 Handout

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