Prac Report 1 COMPLETE NO SHEETS

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School

Queensland University of Technology *

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Course

270

Subject

Civil Engineering

Date

Oct 30, 2023

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docx

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Uploaded by DoctorWillpower16387

EGB270 Civil Engineering Materials Assessment Number 01 - 1.1 Concrete Mixing - 1.2 Test of concrete strength DECLARATION I am aware of the University rule that a student must not act in a manner which constitutes academic dishonesty as stated and explained in the QUT Manual of Policies and Procedures (Section C, Part 5.3 Academic Dishonesty , accessible via http://www.mopp.qut.edu.au/C/C_05_03.jsp ). I confirm that this work represents my individual effort and does not contain plagiarised material. Signature ______________________________________________________ Date : 2

Abstract The subject of this report if that of the most widely used material in civil and structural construction worldwide – concrete. The following report covers the design and mixing method of concrete and how this process takes place, including measurements, diagrams, photos, and how certain data was collected. Additionally, it will also comprise of a series of compressive strength tests on the concrete produced. The results of both the concrete design and mix along with the compressive tests will be analysed and the findings will be discussed through academic and definitive reasoning. Finally, a summary of everything found will be given and recommendations of how to better produce and/or test in future practicals of the same nature. The findings of the report are important as they illustrate the fundamental knowledge required to produce concrete and its behaviour, whether that be workability, durability, or strength.

Table of Contents Abstract ........................................................................................................................................................ i List of Tables ............................................................................................................................................... iii List of Figures .............................................................................................................................................. iii 1 Objectives ............................................................................................................................................ 1 2 Materials and Equipment .................................................................................................................... 1 2.1 Practical 1 .................................................................................................................................... 1 2.2 Practical 2 .................................................................................................................................... 2 3 Experimental Procedure ...................................................................................................................... 2 3.1 Practical 1 Procedure ................................................................................................................... 2 3.2 Practical 2 Procedure ................................................................................................................... 2 4 Test Results .......................................................................................................................................... 3 4.1 Practical 1 .................................................................................................................................... 3 4.2 Practical 2 .................................................................................................................................... 4 5 Results Discussions .............................................................................................................................. 7 6 Conclusions and Recommendations .................................................................................................... 8 7 References ......................................................................................................................................... 10 Appendices ................................................................................................................................................ 11 Appendix A ............................................................................................................................................ 11 Appendix B ............................................................................................................................................ 14 Appendix C and D ............................................................................................................................. 17,18

List of Tables Figure 1: Drawing of the equipment used in practical one .......................................................................... 1 Figure 2: Slump from the Slump Cone test in Practical 1 ............................................................................. 3 Figure 3: Image of the Schmidt Hammer test being conducted on cylinder 3 ............................................. 5 Figure 4: Sample one of the compressive tests. Failed at 325.16 kilonewtons due to shear failure ............ 5 Figure 5: Sample one of the compressive tests. Failed at 325.16 kilonewtons due to shear failure ............ 5 Figure 6: Sample two of the compressive tests. Failed at 285.85 kilonewtons due to columnar failure ...... 6 Figure 7: Sample two of the compressive tests. Failed at 285.85 kilonewtons due to columnar failure ..... 6 Figure 8 Sample three of the compressive tests. Failed at 372.88 kilonewtons due to shear failure ........... 6 Figure 9: Sample three of the comprfessive tests. Failed at 372.88 kilonewtons due to shear failure ........ 6 List of Figures Table 1: Mix proportions; provided and calculated ...................................................................................... 4 Table 2: All data gained from compressive tests on the concrete columns .................................................. 8

EGB270 Civil Engineering Materials Assessment Number 01 1 Objectives Over the course of two practical sessions, a series of tests were conducted, all of which hold relevant information and data. In these practical sessions, a desired concrete design strength was chosen, produced, and tested weeks later. The objective of this report is to describe the processes of the labs, deliver the results collected from these practical sessions and link to relevant theory, provide detailed analysis and discussion of the results through comparison and reasoning, and finally present recommendations for future laboratory testings. 2 Materials and Equipment In these practicals, the following lists provide all the materials and equipment used for concrete mixing, the slump test, creating concrete moulds, and concrete testing. 2.1 Practical 1 - Concrete mixes o Gravel (coarse) – 4.66kg o Sand (fine) – 5.46kg o Water – 1.50kg o Cement – 3.38kg - Pan mixer - Scale (for finding weight) N10624121 1 Figure 1: Drawing of the equipment used in practical one.

EGB270 Civil Engineering Materials Assessment Number 01 - Slump cone - Concrete moulds - Scoop - Shovel - Tamping rod - Balance - Float and trowel 2.2 Practical 2 - Scales - Measuring equipment - Schmidt hammer - Compression machine 3 Experimental Procedure Two practicals were conducted for this report. The following two sections 3.1 ∧ 3.2 describe the procedure undertaken in the two practical laboratory sessions. 3.1 Practical 1 Procedure A specific concrete mixture intended for a 40MPa strength concrete was provided. The required proportions of cement, water, coarse and fines for this strength concrete collected, accurately measured by weight and all added to the same pan mixer for mixing. The concrete mixture was then placed into the mechanical mixer for roughly five minutes until all the contents are evenly mixed. This mixture was N10624121 2

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