EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 1 SCHOOL OF ARCHITECTURE, COMPUTING & ENGINEERING Instructions for Students:  Avoid plagiarism and collusion. Please carefully read and consider the detailed information about avoiding plagiarism and collusion: http://www.uel.ac.uk/aple/academic/avoidingplagiarism/  All work has to be presented in a ready to submit form through hub. For more information visit http://www.uel.ac.uk/hsb/student/enqdesk/helpdeskfaqspage7.  A typewritten report with necessary calculation sheets and drawings for each laboratory test is to be submitted within the deadline given through Hub. Students are advised to keep the copy of their assignment for their record. The report should include: introduction, experiment description, results and discussion, conclusions, and references.  Cover sheet to be attached to the front of the assignment when submitted through HUB. For details about the cover sheet contact hub or use the coversheet provided in the Moodle. Make sure you have correct details about the assignment such as title of the assignment, name of the module tutor, etc.  All pages to be numbered sequentially.  Assessment: By individual submission. Credit will be given on the basis of the assessment for calculations, interpretation, presentation and results in the submitted report. For marking scheme and assessment criteria see Appendix A.  For advice and suggestions on assignment a draft copy of the assignment should be submitted online through Moodle as a single pdf file by 4pm on …5th April 2017………………… Module code EG4102 Module title Earth and materials Properties Module leader Dr Jaya Acharya Nepal Module tutor Dr Jaya Acharya Nepal Assignment title Materials Properties- Laboratory tests Assignment number Part 2 of 2 – Coursework (all 3 Lab tests) Lab test1: Slump test Casting and curing of concrete cubes Lab test2: Tensile strength testing of metals EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 2 Lab test3: Compressive strength test of concrete cubes Weighting 12.5% Handout date ………………………… Submission date A hard copy of the report (all 3 Lab tests as one report) through HUB by 4:00pm on ……Wednesday 26th April 2017. Learning outcomes assessed by this assignment 4,7,8,9,11,12 Turnitin submission requirement No Turnitin Grade Mark feedback used? No UEL Plus Grade Book submission used? No UEL Plus Grade Book feedback used? No Other electronic system used? No Are submissions / feedback totally electronic? No Form of assessment: Individual work Number of assignment copies required 1 Report (Lab test1, 2 and 3 as one single report) Assignment can be presented in the following format:  Tape bound/ Spiral bound  Placed in a A4 ring bound folder (not lever arch) Soft copy: Soft copy not required Additional information NA HEALTH AND SAFETY: IMPORTANT: BEFORE you undertake any work in the laboratory area you MUST be wearing the Personal Protective Equipment specified (normally laboratory coat and safety footwear) and be briefed by a laboratory technician (or Module tutor) on any relevant Health and Safety matters. All Health & Safety notices on individual items of equipment and on the Health & Safety noticeboard in the laboratory area must be read and acted on as necessary. Every student must attend Health and Safety induction before conducting any lab test. EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 3 Materials Properties Lab Test SLUMP TEST AND CASTING AND CURING OF CONCRETE CUBES Objectives:  To determine the influence of water on workability of concrete by means of slump test.  To prepare concrete cubes for compressive strength test. Materials and Apparatus: Sand, aggregates, cement, water, measuring jug, sampling scoop, small scoop, buckets, tamping bar, felt tip pen or crayon, cube moulds, trowels, spanner, damp cloth and curing tank. Concrete mix to be used in the lab by each group: Concrete mix with 6 parts aggregate and 1 part cement will be used in the experiment. Thursday: Aggregate (Coarse and Fine): 12 kg Cement: 2 kg water cement = 0.40 (Group A) water cement = 0.45 (Group B) Friday: Aggregate (Coarse and Fine): 12 kg Cement: 2 kg water cement = 0.5 (Group A) water cement = 0.6 (Group B) EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 4 Monday: Aggregate (Coarse and Fine): 12 kg Cement: 2 kg water cement = 0.65 (Group A) water cement = 0.70 (Group B) SLUMP TEST Procedure: Mix cement, aggregate and water to the proportions calculated in the mix design or with 1 to 6 cement to aggregate ratio and appropriate water-cement ratio or as advised by your tutor (manual mix or use concrete mixer for about 3 to 5 minutes). 2. Ideally, slump test must be completed within 2.5 minutes of preparing the concrete / taking the sample. 3. Dampen the slump test mould which is in the shape of a frustum of a cone with the diameters of 100mm and 200mm and height of 300mm. 4. Place the mould with its larger base down on a flat, moist and non-absorbent rigid surface. 5. Hold the mould down firmly by standing firmly on the two foot pieces. 6. Fill the mould to one-third of its volume (equivalent approximately to the depth of 67mm). 7. Tamp the concrete in the mould 25 times using a still rod to distribute and compact. 8. Put more concrete in the mould to two-third of the volume (equivalent approximately to the depth of 155mm). 9. Tamp the concrete in the mould 25 times again making sure that the rod penetrates into the previous layer when tamping. 10. Add the final layer and repeat step 8. Make sure that you keep the mould full and topped up at all times when tamping to properly fill the mould and compact the concrete. 11. Level the surface of concrete in the mould by rolling the tamping rod over the top surface of the mould. 12. Take your feet gently off the foot pieces on the mould and raise the mould up by your hands without any torsion or lateral motions. EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 5 13. Measure the slump value which is defined as the vertical difference between the top of the mould and the displaced original centre of the top of the specimen (See the Figure 1 below). Figure 1. Measuring the slump value Note: If two consecutive tests on a sample of concrete show falling away or shearing off of a portion of the concrete from the mass of the specimen, it might be an indication the concrete lacking the necessary plasticity and cohesiveness for the slump test to be applicable and the test results will be considered invalid. Results:  Complete the lab data sheet and record the results. Include completed lab data sheet and recorded results, diagrams and apparatus sketches, descriptions and any other details in lab report.  Use general laboratory report structure for preparing your lab report and include the following in your report: o Record mix design weights and also measure the slump value and note it down to the nearest 5mm. o Describe the type of the slump that has happened. Discussions:  Discuss the workability condition of the tested concrete and the relationship between the slump value and the placing and compaction process of the concrete.  Workability is a characteristic of concrete, explain the significance of slum test in practice.  Explain if the tested concrete is suitable for construction and where it can be used and what would be the best way to place and compact it. EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 6 Slump Test– Lab Data Sheet Date: Day: Student number: Group: Sub-group: EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 7 CASTING AND CURING OF CONCRETE CUBE SAMPLES Procedure: 1. Mix cement, aggregate and water to the proportions calculated in the mix design or with 1 to 6 cement to aggregate ratio and appropriate water-cement ratio or as advised by your tutor (manual mix or use concrete mixer for about 3 to 5 minutes). Note: If any specific admixture(s) is to be added, then it must be mixed with water. 2. Check and record slump, temperature and air content of the fresh concrete if possible. 3. Apply grease to the inside surfaces of standard cube moulds sized 100 or 150mm to facilitate removing hardened samples. 4. Compact concrete in two layers (three layers in case of 150mm sized mould) in the mould by tamping each layer 25 times (no fewer than 35 tamps in case of 150mm sized mould) with a round ended steel rod. This will help compacting and evenly distributing concrete in the mould. Note: Do not overfill the mould for compaction by more than 6mm. Note: Compacting can also be done by vibrating the concrete in the mould using a vibrating table; however, over vibrating must be avoided as it may lead to segregation. 5. Level the final surface of the concrete in the mould and make it as smooth as possible. 6. Cover the surface of the mould with a wet cloth. 7. After 16 to 72 hours remove samples from the moulds carefully by loosening the screws and gently hitting the loosened moulds using a rubber hammer. 8. Leave the samples in water in a curing water tank or put them in a moist room with the minimum humidity of 95% and temperature of 23oC. Note: Curing time in the water tank or moist room can vary between 3, 7, 28, 56,…, 91 days with 28 being the most popular as concrete gains most of its strength at 28 days of age. EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 8 Results:  Complete the lab data sheet and record the results (wherever possible). Include completed lab data sheet and recorded results, diagrams and apparatus sketches, descriptions and any other details in lab report.  Use general laboratory report structure for preparing your lab report and include the following in your report: o Record mix design weights and measure and record the slum value to the nearest 5mm and also the temperature and the air content values. o Record size and number of specimens and any possible deviations from the standards during the test, if any. Discussions:  Describe the appearance of the fresh concrete and also cured cube samples.  Discuss what would happen if concrete samples are not cured.  Explain the tests that might be done on the hardened concrete and their purposes and applications in engineering design and construction. EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 9 Casting and Curing of Concrete Cubes - Lab data sheet Date: Day: Student number: Group: Sub-group: EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 10 Materials Properties Lab Test TENSILE STRENGTH TESTING OF METAL Objectives:  To determine maximum tensile strength of a metal.  To produce tensile stress-strain curve for a metal specimen.  To investigate stress-strain behaviour of different metals. Materials and Apparatus: Tensile testing machine, micrometre, Vernier calliper, metal samples. Metal Sample to be used in the lab by each group: Thursday: Aluminium: (Group A) Steel: (Group B) Friday: Aluminium: (Group A) Steel: (Group B) Monday: Aluminium: (Group A) Steel: (Group B) Procedure: 1. Setting up the experiment: Note: Please do not attempt to carry out the test until the technician has examined all the equipment to ensure that the experiment can be carried out safely. EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 11 Figure 1. Hounsfield tensile testing machine 2. Choose a metal sample. Examine the specimen carefully for any possible damages or localised weaknesses. 3. Measure the diameter of the sample at its narrowest point using the micrometre and measure the length of the sample between the shoulders using the Vernier Calliper and record both measurements. 4. Using the parts shown in Figure 2, assemble the metal sample in the chucks as shown in Figure 3 below. Figure 2. Parts required for assembling of metal sample for testing EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 12 Figure 3. Assembly of metal specimen, clamp, collar and pin 5. Assemble both chucks in the Tensometer as shown in Figure 4. Figure 4. Specimen installed in the Tensometer 6. Apply a small load to seat the chucks. Shut the Tensometer safety cover. Set Zero “Force” and “Extension” displays using control keys on the keypad. Press the “Test” key on the keypad to start the test. Note: To run the experiment obtain permission from Lab Technician. 7. The machine will extend the sample at the rate of approximately 3.5mm/ min and will continue until fracture occurs. The data given in the results is recorded straight onto the computer attached to the Tensometer taking readings every second, from which graph is produced. When the specimen is failed press the “Stop” key to disengage the load. Press the print key to get a graphical print-out of the test results. A typical graph is shown in Figure 5. EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 13 8. Remove the sample and measure the dimensions of the cross-sectional area at necking and failure point. Put two parts of the failed specimen together and measure the gauge length after failure to calculate the change in length. If required, repeat the experiment using other metal samples. Figure 5. Typical load – extension graph Results:  Complete the lab data sheet and record the results (wherever possible). Include completed lab data sheet and recorded results, diagrams and apparatus sketches, descriptions and any other details in lab report. EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 14  Use general laboratory report structure for preparing your lab report and include the following in your report: o Initial dimensions of the specimen (cross-sectional area and gauge length). o Load-elongation graph generated from computer. o Reduction in the cross-sectional area. o Increase in length. o Stress-strain graph using data from load-elongation graph. (The stress is calculated form load and stain is calculated form extension). o Mark the following points on the stress-strain graph: a. Limit of proportionality b. Yield stress c. Proof stress d. Ultimate tensile stress e. Fracture stress f. Elastic and plastic region o Modulus of Elasticity o Maximum tensile stress (ultimate tensile strength) and the corresponding strain at failure. o Breaking strength and the corresponding strain. o Compare the stress-strain behaviour of Aluminium and Steel using the results from this experiment. Discussions: 1. Briefly undertake an analysis of your results and comment on the differences (if any) of your results compared with the published figures. 2. Explain briefly, how accurate was the experiment and how can it be improved. 3. Does the experiment enable you to have a greater understanding of how materials behave when stressed? Discuss! 4. Discuss the importance of this test in practice. EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 15 Date: Day: Student number: Group: Sub-group: 1) Specimen-before test: Round Cross-section: Diameter: …………………mm Cross-section area: …………………mm2 Rectangular Cross-section: Width……………….….mm; Thickness……………..mm Cross-section area: …………………mm2 Gauge length:……………..…………………………….mm 2) Specimen-after test: Round Cross-section: Diameter: …………………mm Cross-section area: …………………mm2 Rectangular Cross-section: Width……………….….mm; Thickness……………..mm Cross-section area: …………………mm2 Gauge length:……………..…………………………….mm Tensile Strength Test - Lab Data Sheet EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 16 Tensile Strength Test - Lab Data Sheet Date: Day: Student number: Group: Sub-group: Load (N) Elongation (mm) Stress (N/mm2) Strain EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 17 Materials Properties Lab Test COMPRESSIVE STRENGTH TEST OF CONCRETE CUBES Objectives:  To determine the compressive strength of concrete cubes.  To examine the influence of water/cement on the compressive strength of concrete. Materials and Apparatus: Compression testing machine and samples of concrete cubes. Note: Samples of concrete cubes prepared in previous experiment will be tested after 28 days of curing. Procedure: 1. Prepare the concrete cubes in accordance with the previous experiment; “Design a concrete mix”. 2. Measure the dimensions of the sample to be tested that is the area in contact with the platens. 3. Before loading the samples make sure that the machine is switched off. When testing the samples make sure that the smooth surfaces are in contact with the platens. Place the samples between the platens, centring them. Close the protective door. Switch on the machine. The rate of loading is already set. The machine automatically stops when failure occurs. The machine will display the strength of the concrete that you have made. 4. Make a note of the readings obtained. Results:  Complete the lab data sheet and record the results. Include completed lab data sheet and recorded results, diagrams and apparatus sketches, descriptions and any other details in lab report.  Use general laboratory report structure for preparing your lab report and include the following in your report: o Record data of concrete mix design, slum value to the nearest 5mm and also the temperature and the air content values. o Record size and number of specimens and any possible deviations from the standards during the test, if any o Record the failure load and evaluate compressive strength. EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 18 o Record water cement ratio and corresponding compressive strength. Show the relationship between water/cement ratio and compressive strength. Note: Obtained data from each group to plot results for water/cement and compressive strength. Discussions:  Explain briefly how does the strength indicated by the testing machine compares with your designed strength.  Discuss the importance of the water cement ratio.  This experiment is described as a destructive test but it is always not possible to conduct a destructive test and require a non - destructive test (NDT), can you describe such tests performed on hardened concrete? EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 19 Compressive Strength of Concrete - Lab Data Sheet Date: Day: Student number: Group: Sub-group: Mix design …………………………………………………………………………………… Dimension of concrete cube………………………………………………………………… Contact area of concrete cube………………………………………………………………. Slump value …………………………………………………………………………………. Specimen Age (days) Failure Load (N) Compressive strength (MPa) Average compressive strength = Comments: ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ……………… EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 20 Appendix A Marking scheme SS.N. Components Marks (%) 1 Overall Presentation 10 2 Introduction 5 3 Experiment description 10 4 Results, Analysis and Discussion 60 5 Conclusions 10 6 References 5 Total 100 Assessment criteria: 100-70 69-60 59-50 49-45 45-40 39-30 29-1 1st Class 2nd class upper 2nd class lower 3rd class Fail Bad fail Content of coursework Interpretation and scope  Has entirely addressed the topic set  An excellent attempt to reflect the scope of the assignment  Almost no omissions or no misunderstandings  Has correctly addressed the topic set  A very good attempt to reflect the scope of the assignment  Only a few minor omissions and misunderstandings  A reasonable attempt at addressing the topic set  Some minor omissions and misunderstandings  No irrelevant material  Has begun to address the topic set  Occasional minor omissions and misunderstandings  Some irrelevant material  Has only just begun to address the topic set  A few major omissions and misunderstandings  Some irrelevant material  Not really addressed the topic set  Many major omissions and misunderstandings  Much irrelevant material  Not addressed the topic set  No irrelevant material EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 21 Identification of information  Substantial evidence of independent information seeking  Much evidence of independent information seeking  Evidence of independent information seeking  Some evidence of independent information seeking  Little evidence of independent information seeking  Very little evidence of independent information seeking  No evidence of independent information seeking  Evidence of potential use of unfair means Technical analysis  Excellent standard of technical analysis  Very good standard of technical analysis  Good technical analysis but some omissions and/or errors  A reasonable level of technical analysis but some omissions and/or error  Analysis attempted but too many omissions and/or error  Analysis superficial  part of analysis missing  Analysis very superficial or non-existent Evaluation of findings  Significant evaluation and an excellent approach to the synthesis of relevant evidence to support arguments/points  Significant evaluation and synthesis of relevant evidence to support arguments/points  Evidence of evaluation and reasonable synthesis of relevant evidence to support arguments/points  No evidence of evaluation and only some evidence of synthesis of relevant evidence to support arguments/points  No evidence of evaluation and very little evidence of synthesis of relevant evidence to support arguments/points  Evidence presented with little attempt at evaluation and almost no attempt at synthesis  No attempt at evaluation or synthesis Structure  Structure excellent, logical order and appropriate to task  Introduction and conclusion excellent  Clear structure appropriate to task  Introduction and conclusion good  Structure appropriate but could be improved  Introduction and conclusion adequate  Some structure but flawed  Introduction and conclusion do not serve their function well  Structure has major flaws  Introduction and conclusion weak  Inappropriate structure  Introduction and conclusion almost perfunctory  No structure  No introduction and/or conclusion 100-70 69-60 59-50 49-45 45-40 39-30 29-1 1st Class 2nd class upper 2nd class lower 3rd class Fail Bad fail Presentation and style of the coursework Use of English  Very high standard  Negligible errors. Clear and easy to read  Very good standard  Very occasional errors.  Minimal errors in punctuation, the misuse of words, spelling and sentence construction  Occasional errors in punctuation, misuse of words, spelling and sentence construction, style – make work difficult to understand  Some errors - punctuation, misuse of words, spelling and sentence construction, style – make work frequently difficult to understand  Frequent errors - punctuation, spelling, sentence construction etc. often make work difficult to understand  Frequent errors - punctuation, misuse of words, spelling, sentence construction – make work largely incomprehensible EG4102 – Materials Properties Laboratory Tests – Part 2 of 2 - Coursework 22 Presentation of data and references  Excellent use of relevant data, examples, figs, models  Excellent use of citations within the text  All references and citations accurately cited and listed  All references and citations consistently cited and listed  Very good use of relevant data etc.  Good use of citations within the text  Most references and citations accurately cited and listed  Most references and citations consistently cited and listed  Some good use of relevant data etc.  Some good use of citations within the text  The majority of references and citations accurately cited and listed  The majority of references and citations consistently cited and listed  Reasonable use of relevant data etc.  Occasionally good use of citations within the text  The minority of references and citations accurately cited and listed  The minority of references and citations consistently cited and listed  Superficial use of relevant data etc.  Very few citations within the text  Few references and citations accurately cited and listed  Few references and citations consistently cited and listed  Poor use of relevant data etc.  Little understanding of referencing systems  Very few or no references  Very little or no understanding of referencing systems  The use of unfair means was identified Overall presentation  Excellent. Carefully organised and well presented  Carefully organised and well presented  Presentation satisfactory  Presentation adequate  Presentation only just acceptable  Unacceptable presentation  No attempt to present the work * Assessment grid adapted from http://ischool.dept.shef.ac.uk/taught/images/7/7e/UG-Marking-Grid.png