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Fresh Concrete LAB - lab report

lab report

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Civil Engineering (EC110)

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Universiti Teknologi MARA

Academic year: 2022/2023

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TITLE: LAB 11 - Concrete Mix Design, Workability Test and Compacting Factor Test for Fresh

Concrete

1 Introduction

The traditional methods of conducting laboratory activities will not be able to provide an avenue for

students to enhance independent learning activities and inculcate creativity and innovation. Level 0 is

fully prescriptive where problem, ways & means and answers are provided to the students. However,

it is still necessary especially to first- and second-year students.

In this laboratory activity students will be exposed to the apparatus and the procedures to carry out

experiments on slump test and compacting factor test.

1 Objectives

The objective of the test is:

To determine the workability of fresh concrete by slump test and compacting factor test.

1 Learning Outcomes

At the end of the laboratory activities, students would be able to:

Identity and use the correct apparatus/ tools to carry out experiments on slump test and compacting

factor test.

Work in a group to undertake the task.

Collect and analyze the data correctly and produce the technical report.

1 Theoretical Background

Unsupported concrete, when it is fresh will flow to the sides and sinking in height wil take place. Ihis

vertical settlement is known as slump. In this test fresh concrete will be filed into a mould of specified

shape and the settlement or slump is measure when the supporting mould is removed. Slump increases

as water cement ratio increase and for different work different slump value are suitable.

slump is measure indicating the consistency (i. the state of fluidity whether dry o wet of concrete

and also slump given an idea of W/C ratio needed for concrete to be 1884 for different works. In the

laboratory, the test is recommended as according to BS 1881: part: 1970.

The typical types of slump are shown In Figure 1. The description of workability, corresponding

slump and compacting is shown in Table 1.

Table 1 : Description of workability, corresponding slump and compacting factor.

2 Problem Statement

Students are required to determine the workability or consistency of concrete mix of given grade and

or proportion by conducting slump and compacting factor test.

Students are required to find the ways & means of the tests and subsequently analyses the data and

present it in a proper technical format.

v. Each layer is compacted in turn 25 times with the tamping rod with free fall method vi. After the top layer is tamped, the top fill is smoothed off by passing the rod over the mould and level with trowel vii. The base of the mould is wiped from concrete viii. The mould is moved carefully and slowly in a vertical direction keeping it quite straight. ix. The rod is rested across the top of the inverted empty mould, so that it touches over the mould of concrete x. The slump of concrete is measured with a ruler from the highest point of the concrete to the underside of the rod xi. The measured and types of slump is recorded b) Compacting Factor Test i. The compacting factor test apparatus is kept on a level ground ii. The empty cylinder is weighed, and its mass is recorded iii. The hopper trap doors are fastened with the catches. The cylinder is fixed on the base with fly nut and bolt. The cylinder is covered with two trowels iv. By using a hand scoop, concrete is loosely placed in the upper hopper v. The trap door is opened and allowed the concrete to fall into the lower hopper vi. Immediately after the concrete has come to rest, the trowels on the cylinder are removed and the second trap door is opened and the concrete is allowed to fall into the cylinder, bringing the concrete into standard compaction vii. The excess of the concrete remaining is removed above the level of the top of the cylinder by holding trowel in each hand and moving them simultaneously towards each other. viii. The cylinder is cleaned from all sides. The concrete is weighed and its mass is recorded. ix. The cylinder from the same concrete is refilled with three equal layers with each layer approximately one third of the height of the cylinder x. Each layer is compacted in turn 25 times with the tamping rod or using vibrator xi. The cylinder filled with fully compacted fresh concrete is weighed and its mass is recorded

8. RESULT & ANALYSIS

a) Slump Test Table 1: Observation and Result for Slump Test No. Date Grade of Concrete Water/Cement Ratio Slump(mm) Type of slump 1 14/6/2023 30 0 13 True slump b) Compacting Factor Test Mass of Empty Cylinder(M) = 4 Table 2: Observation, Result and Calculation for Compacting Factor Test Sample No. w/c Ratio Mass with Partially Compacted Concrete(M1) Mass of Fully Compacted Concrete(Mo) Mas of Partially Compacted Concrete(M

M) Mass of fully compacted concrete(Mo
M) Compacting Factor (M1- M)/Mo-M) 1 0 15 16 11 11 0.

APPENDIX

Concrete Mix

Slump Test Compaction Test

TABLE OF CONTENT

7. PROCEDURS 3-

  - 1. INTRODUCTION NO. CONTENT PAGES
  - 2. OBJECTIVES
  - 3. LEARNING OUTCOMES
  - 4. THEORETICAL BACKGROUND 1-
  - 5. PROBLEM STATEMENT
  - 6. APPARATUS
  - 7. PROCEDURS 3-
  - 8. RESULT &amp;amp; ANALYSIS
  - 9. DISCUSSION

1. CONCLUSION
- 1. APPENDIX

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