Civil Engineering - Concrete Mix Design -Ebook- cheap!

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Civil Engineering - Concrete Mix Design -Ebook- cheap!

Civil Engineering - Concrete Mix Design -Ebook- cheap!
We as civil/structures engineer are often told to design concrete on various project. This book on the design of normal concrete mix is a handy guide to help us through the process. It has good explanation with examples to understand the design process.

Contents

Foreword v
1 Introduction 1
1.1 Principles of proposed method 1
1.2 Basic concepts 1
Part one: Background information
2 The workability of concrete 5
2.1 Measurement of workability 5
2.2 Water content 5
2.3 Type and strength class of cement 5
3 The compressive strength of concrete 5
3.1 Age at test and curing conditions 5
3.2 Type and strength class of cement 6
3.3 Cement strength variation 6
3.4 Aggregate type and grading 6
3.5 Relationship between compressive strength and free-water/cement ratio 6
3.6 Type of mixing 6
4 Variability of concrete strength during production 6
4.1 Factors contributing to the overall variation 6
4.2 The distribution of results 7
4.3 Characteristic strength 7
4.4 Margin for mix design 7
Part two: The mix design process
5 Flow chart of procedures 9
5.1 Selection of target water/cement ratio (Stage 1) 9
5.2 Selection of free-water content (Stage 2) 13
5.3 Determination of cement content (Stage 3) 13
5.4 Determination of total aggregate content (Stage 4) 13
5.5 Selection of fine and coarse aggregate contents (Stage 5) 13
6 Trial mixes 17
6.1 Production of trial mixes 17
6.2 Tests on trial mixes 17
6.3 Adjustments to mix proportions 17
7 Examples of mix design 20
7.1 Example 1: unrestricted design 20
7.2 Example 2: mix restricted by maximum water/cement ratio 22
7.3 Example 3: mix restricted by minimum cement content 22
7.4 Example 4: mix restricted by maximum cement content 22
Part three: Modifications to mix design method
8 Design of air-entrained mixes 27
8.1 Effect of entrained air on strength 27
8.2 Effect of entrained air on workability 27
8.3 Density of air-entrained mixes 27
8.4 Modifications to the design process 28
8.5 Trial mixes of air-entrained concrete 28
8.6 Example of mix design 28
9 Design of Portland cement/pfa mixes 30
9.1 Introduction to pulverised-fuel ash (pfa) 30
9.2 Changes to the background information 30
9.3 Modifications to the mix design method 31
9.4 Example of mix design 32
9.5 Use of Portland pulverised-fuel ash cement 33
10 Design of Portland cement/ggbs mixes 36
10.1 Introduction to ground granulated blastfurnace slag (ggbs) 36
10.2 Information on Portland cement/ggbs concrete 36
10.3 Advice on methods of mix design for Portland cement/ggbs concrete 36
References 38
iv


About the book:
The method of concrete mix design described
in this publication is the same as that used in
the first edition, which was published in 1975[1]
and revised in 1988[2]. In this second edition,
minor amendments have been made to allow
for changes in the terminology and properties
of the materials used and for changes in various
British Standard Specifications.
The basic procedure for this mix design
method is applicable to concrete for most
purposes including pavements. It is restricted
to designing concrete mixes to meet
workability, compressive strength and
durability requirements using Portland
cements complying with BS 12[3] or BS 4027[4]
and natural aggregates complying with
BS 882[5], or coarse air-cooled slag complying
with BS 1047[6]. It does not deal with special
materials or special concretes such as
lightweight aggregate concrete, or with
flowing or pumped concrete. Guidance is given
on the application of the method to mixes
incorporating pulverised-fuel ash (pfa) for
material complying with BS 3892:Part 1[7], or
using Portland pulverised-fuel ash cement
complying with BS 6588[8]. Guidance is also
given on the design of mixes incorporating
ground granulated blastfurnace slag (ggbs)
complying with BS 6699[9] or using Portlandblastfurnace
cements complying with BS 146[10]
or BS 4246[11].
As in the first edition, the general principles
and basic concepts are given in the
Introduction. After this the publication is
divided into three parts. Part one gives the
background information which is required to
understand the mix design procedure.
Part two describes the mix design process
and contains all the basic information in the
form of tables and graphs for the application of
the method to most concretes designed for
compressive strength. A standardised form has
been developed for use with this method, and
some worked examples are given.
Part three deals with modifications to the
mix design method to deal with air-entrained
concrete, and for the design of mixes
incorporating pfa or ggbs.
This method is based on data obtained at the
Building Research Establishment, the Transport
Research Laboratory (formerly the Transport
and Road Research Laboratory), and by the
British Cement Association (formerly the
Cement and Concrete Association).
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