Effect of Surface Finish on Concrete Properties 2013-12-05آ  2.3.2 Measuring Fresh Air Content ......

download Effect of Surface Finish on Concrete Properties 2013-12-05آ  2.3.2 Measuring Fresh Air Content ... slabs

of 190

  • date post

    02-Apr-2020
  • Category

    Documents

  • view

    0
  • download

    0

Embed Size (px)

Transcript of Effect of Surface Finish on Concrete Properties 2013-12-05آ  2.3.2 Measuring Fresh Air Content ......

  • Effect of Surface Finish on Concrete Properties

    by

    Ardavan Amirchoupani

    A thesis submitted in conformity with the requirements for the degree of Master of Applied Science

    Civil Engineering University of Toronto

    © Copyright by Ardavan Amirchoupani 2013

  • ii

    Effect of Surface Finish on Concrete Properties

    Ardavan Amirchoupani

    Master of Applied Science

    Civil Engineering

    University of Toronto

    2013

    Abstract

    The purpose of this project was to evaluate two types of concrete surfaces and analyze the effect

    of each finish on the air content, paste content, aggregate fraction and rate of absorption at

    various depths from the surface. For this project, nine concrete mixtures were evaluated with

    varying cement, water and air contents. Slabs were cast and two types of finishes were

    considered: a trowel-finished made with a magnesium trowel and a form-finished from the

    plywood molds used. Cores were taken from the slabs and tested at 0, 5, 10, and 20mm below

    the surface.

  • iii

    Acknowledgments

    I would like to thank my supervisor Prof. Hooton for his guidance, encouragement and support.

    I would also like to thank Prof. Peterson for his assistance and advice throughout this endeavor.

    Additionally, this project would not have been possible without the help of Olga Perebatova and

    the help of my colleagues in the Concrete Materials group at University of Toronto.

    Special thanks to my officemates Eric, Majella, Mahsa, and Johnny for their help. Additional

    thanks to all my friends especially Patrick and Amin for their company and their presence of

    which was a pleasant distraction and without whom graduate school would not have been

    anywhere as enjoyable. Lastly, I would like to thank my family for their love and support.

  • iv

    Table of Contents

    Acknowledgments .......................................................................................................................... iii

    Table of Contents ........................................................................................................................... iv

    List of Tables ................................................................................................................................ vii

    List of Figures .............................................................................................................................. viii

    List of Appendices .......................................................................................................................... x

    Chapter 1 Introduction .................................................................................................................... 1

    1 Background ................................................................................................................................ 1

    1.1 Objective ............................................................................................................................. 1

    1.2 Description of Experimental Work ..................................................................................... 1

    Chapter 2 Literature Review ........................................................................................................... 3

    2 Background ................................................................................................................................ 3

    2.1 Concrete Components and Hydration ................................................................................. 3

    2.2 Transport Mechanisms in Concrete .................................................................................... 4

    2.2.1 Sorptivity ................................................................................................................. 5

    2.3 Air Entrainment .................................................................................................................. 9

    2.3.1 Air Entraining Agents ........................................................................................... 10

    2.3.2 Measuring Fresh Air Content ................................................................................ 11

    2.4 Methods for Measuring Air Content in Hardened Concrete ............................................. 12

    2.5 Concrete Placement and Finishing .................................................................................... 16

    2.5.1 Screeding ............................................................................................................... 17

    2.5.2 Floating ................................................................................................................. 17

    2.5.3 Troweling .............................................................................................................. 18

    2.5.4 Curing ................................................................................................................... 18

  • v

    2.6 Related Studies .................................................................................................................. 19

    Chapter 3 Experimental Procedures .............................................................................................. 26

    3 Background .............................................................................................................................. 26

    3.1 Materials ........................................................................................................................... 26

    3.1.1 Cementitious and Supplementary Cementing Materials ....................................... 26

    3.1.2 Fine Aggregate ...................................................................................................... 26

    3.1.3 Coarse Aggregate .................................................................................................. 26

    3.1.4 Chemical Admixtures ........................................................................................... 27

    3.2 Concrete Mixture Design .................................................................................................. 27

    3.2.1 Proportioning ........................................................................................................ 28

    3.2.2 Casting Procedures ................................................................................................ 29

    3.2.3 Curing Procedures ................................................................................................. 32

    3.3 Testing Hardened Concrete Properties ............................................................................. 33

    3.3.1 Compressive Strength ........................................................................................... 33

    3.3.2 Resistivity and Permeability Tests ........................................................................ 33

    3.3.3 Rate of Absorption Test ........................................................................................ 35

    3.3.4 Hardened Air, Aggregate and Paste Content Analysis ......................................... 38

    Chapter 4 Results and Discussion ................................................................................................. 45

    4 Background .............................................................................................................................. 45

    4.1 Compressive Strength Results .......................................................................................... 45

    4.2 Resistivity and Permeability Results ................................................................................ 48

    4.3 Sorptivity Results .............................................................................................................. 52

    4.4 Aggregate Distribution Results ......................................................................................... 62

    4.5 Hardened Air Content Analysis ........................................................................................ 67

    4.6 Paste Content Analysis ..................................................................................................... 71

    4.7 Cylinder Aggregate and Paste Distribution ...................................................................... 76

  • vi

    Chapter 5 Conclusions and Recommendations ............................................................................. 77

    5 Conclusions .............................................................................................................................. 77

    5.1 Recommendations ............................................................................................................. 79

    References ..................................................................................................................................... 80

    Appendices .................................................................................................................................... 86

  • vii

    List of Tables

    Table 1: ASTM C457 Air Void Parameter Equations .................................................................. 14

    Table 2: Summary of Concrete Mixtures ......................