This document discusses concrete mix design and proportioning. The objective of mix design is to determine the most economical combination of materials to produce durable concrete of required strength under given conditions, using minimum cement and water. Factors considered include workability, strength, durability and economy. The principles are to use minimum cement and water while maintaining workability and quality. Concrete strength is directly related to the water-cement ratio, with lower ratios producing stronger, more durable concrete. Common mix design methods include the absolute volume method and ACI standards for different concrete types.
This presentation contains IS Concrete mix design method and Basics of Design mix of concrete.It conveys; Objectives of Mix Design ;Grades of Concrete; Nominal Mix and Design Mix; Factors affecting Choice of Mix Design; Methods of Concrete Mix Design; IS Method Of Design.
This presentation contains IS Concrete mix design method and Basics of Design mix of concrete.It conveys; Objectives of Mix Design ;Grades of Concrete; Nominal Mix and Design Mix; Factors affecting Choice of Mix Design; Methods of Concrete Mix Design; IS Method Of Design.
Development of mix design for high strength Concrete with AdmixturesIOSR Journals
This paper presents the result of mix design developed for high strength concrete with silica fume
and High range water reducing admixture (HRWR). It involves the process of determining experimentally the
most suitable concrete mixes in order to achieve the targeted mean strength. In this research work 53 grade
ordinary Portland cement, the locally available river sand, 10 mm graded coarse aggregate were selected based
on ASTM C 127 standard for determining the relative quantities and proportions for the grade of concrete M60.
For this design ACI 211.4R-93 guidelines were followed. Totally Five mixes were designed one mix was treated
as basic mix with HRWR - 0.5% without silica fume, Four mixes were designed with Micro silica quantities
varied from 5 to 9 percent weight of cementitious materials and HRWR varies between 0.6% to 0.9% with
increment of 0.1% . Each mix 2 numbers of 150mm x 300 mm cylinders were cast then kept in curing tank after
24 hours of time period. After 28 days of curing the specimens were tested and the appropriate mix proportions
were obtained.
MEANING OF MIX DESIGN
GRADE OF CONCRETE.
FACTORS INFLUCING THE CHOICE OF MIX DESIGN.
MATHODS OF CONCRETE MIX DESIGN
MIX DESIGN BY INDIAN STANDARD METHOD.
In the following pages to follow an attempt is being made to bring forward a brief analysis about the concrete mix designs of M30 and M40 concrete. Here an effort has been made to find out the compressive strengths developed by both M30 and M40 concrete not only by its normal mix design but also through addition of admixtures and fibres.
The theories presented here have been adopted from the study of various standard codes available for the conduct of civil engineers. Any suggestions and queries regarding correction of the theories as well as the numerical presentations are welcome.
Close care has been taken to present the design solution calculation to the nearest possible decimal values and any error or misprint in the calculations may suitably be considered.
Concrete is made up of ingredients like Cement, Fine Aggregate (Sand), Coarse Aggregate, Water and admixtures. Concrete mix design is done to Optimize the requirements of Cement, Sand, Aggregate and Water in order to ensure that concrete parameters in both Plastic Stage (like workability) and in Hardened Stage (like Compressive Strength and durability) are achieved. The Concrete mix design is as per Indian Standards (IS 10262) and might vary from country to country. The nominal mix design ratios available for concrete less than M30 in strength are only thumb rules and are generally over designed. As the actual site conditions vary and the mix design should be adjusted as per the location and other factors.
Concrete Mix design with the recommendation of IS10262:2009. Also discussed the differences between the IS10262:2009 and IS10262:1982.
The major content of presentation are:
Scope
Introduction
Factors affected mix design
Mix Design
Differences b/w IS10262:1982 and 10262:2009
Exercise
The process of selecting suitable ingredients of concrete and determining their relative amounts with the objective of producing a concrete of the required, strength, durability, and workability as economically as possible, is termed the concrete mix design.
Development of mix design for high strength Concrete with AdmixturesIOSR Journals
This paper presents the result of mix design developed for high strength concrete with silica fume
and High range water reducing admixture (HRWR). It involves the process of determining experimentally the
most suitable concrete mixes in order to achieve the targeted mean strength. In this research work 53 grade
ordinary Portland cement, the locally available river sand, 10 mm graded coarse aggregate were selected based
on ASTM C 127 standard for determining the relative quantities and proportions for the grade of concrete M60.
For this design ACI 211.4R-93 guidelines were followed. Totally Five mixes were designed one mix was treated
as basic mix with HRWR - 0.5% without silica fume, Four mixes were designed with Micro silica quantities
varied from 5 to 9 percent weight of cementitious materials and HRWR varies between 0.6% to 0.9% with
increment of 0.1% . Each mix 2 numbers of 150mm x 300 mm cylinders were cast then kept in curing tank after
24 hours of time period. After 28 days of curing the specimens were tested and the appropriate mix proportions
were obtained.
MEANING OF MIX DESIGN
GRADE OF CONCRETE.
FACTORS INFLUCING THE CHOICE OF MIX DESIGN.
MATHODS OF CONCRETE MIX DESIGN
MIX DESIGN BY INDIAN STANDARD METHOD.
In the following pages to follow an attempt is being made to bring forward a brief analysis about the concrete mix designs of M30 and M40 concrete. Here an effort has been made to find out the compressive strengths developed by both M30 and M40 concrete not only by its normal mix design but also through addition of admixtures and fibres.
The theories presented here have been adopted from the study of various standard codes available for the conduct of civil engineers. Any suggestions and queries regarding correction of the theories as well as the numerical presentations are welcome.
Close care has been taken to present the design solution calculation to the nearest possible decimal values and any error or misprint in the calculations may suitably be considered.
Concrete is made up of ingredients like Cement, Fine Aggregate (Sand), Coarse Aggregate, Water and admixtures. Concrete mix design is done to Optimize the requirements of Cement, Sand, Aggregate and Water in order to ensure that concrete parameters in both Plastic Stage (like workability) and in Hardened Stage (like Compressive Strength and durability) are achieved. The Concrete mix design is as per Indian Standards (IS 10262) and might vary from country to country. The nominal mix design ratios available for concrete less than M30 in strength are only thumb rules and are generally over designed. As the actual site conditions vary and the mix design should be adjusted as per the location and other factors.
Concrete Mix design with the recommendation of IS10262:2009. Also discussed the differences between the IS10262:2009 and IS10262:1982.
The major content of presentation are:
Scope
Introduction
Factors affected mix design
Mix Design
Differences b/w IS10262:1982 and 10262:2009
Exercise
The process of selecting suitable ingredients of concrete and determining their relative amounts with the objective of producing a concrete of the required, strength, durability, and workability as economically as possible, is termed the concrete mix design.
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THIS PRESENTATION IS MAINLY OCCUPIED IN CE 6002 CONCRETE TECHNOLOGY UNIT NO.03......
-------FOR CIVIL ENGINEERING STUDENTS IN 2013 REGULATION =-------------------------
1. What is Mix design.
2. Understand the different types of mix.
3. Design the mix proportion as per IS Method.
4. Design the mix proportion as per ACI Method.
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Teste mix design 8-1
1. Chapter : Proportioning Concrete Mixes
Objective
To determine the most economical and practical
combination of readily available materials to produce a
concrete that will satisfy the performance requirements
under particular conditions of use.
Also, to determine the proportion of ingredients that would
produce a workable concrete mix that is durable, and of
required strength, and at a minimum cost
Factors to be considered include:
� Workability.
� Cohesiveness, slump.
� Placement conditions.
� Strength.
� Durability.
� Appearance.
� Economy.
� Minimize the amount of cement, Minimize w/c ratio.
� Minimum amount of water, to reduce cement content.
� do not sacrifice the quality.
2. Principles of Mix Design
- Workable mix.
- Use as little cement as possible.
- Use as little water as possible.
- Gravel and sand to be proportioned to achieve a
dense mix
- Maximum size of aggregates should be as large as
possible, to minimize surface area of aggregates
4. Water/cement ratio (w/c ratio) theory states that for a
given combination of materials and as long as workable
consistency is obtained, the strength of concrete at a
given age depends on the w/c ratio.
In 1918, Duff Abrams established a water/cement
ratio law for the strength of concrete :
A
c
B1.5( w / c )
compressive strength at some fixed age, A = empirical
constant (96.5 MPa), B= constant that depends mostly on
the cement properties (about 4) , and w/c (water/cement
ratio by weight).
c
Advantages of low water/cement ratio:
�Increased strength.
�Lower permeability.
�Increased resistance to weathering.
�Better bond between concrete and reinforcement.
�Reduced drying shrinkage and cracking.
�Less volume change from wetting and drying.
5. Methods of Mix Proportioning
� Absolute volume method
Most commonly used method (ACI mix dsign)
� Other methods
ACI 211.1 Standard practice
Heavyweight and Mass Concrete.
for
selecting
Normal,
ACI 211.2 Standard practice for selecting Structural
lightweight concrete.
ACI 211.3 Standard practice for selecting Proportions for noslump concrete.
ACI 211.4R Standard practice for selecting high strength
concrete with Portland cement and fly ash.
Designing Concrete Mixtures
Concrete mixture proportions are usually expressed on
the basis of the mass of ingredients per unit volume.
The unit of volume used is either a cubic yard or a cubic
meter of concrete.
6.
7. ACI Mix Design
The most common method used which is established by
ACI Recommended Practice 211.1
Any mix design procedure will provide a first
approximation of the proportions and must be checked by
trial batches.
Local characteristics of materials should be considered.
The following sequence of steps should be followed:
(1) determine the following:
the job parameters
aggregate properties
maximum aggregate size
slump
w/c ratio
admixtures,
(2) calculation of batch weight, and
(3) adjustments to batch weights based on trial mix.
The aim of the designer should always be to get
concrete mixtures of optimum strength at minimum
cement content and acceptable workability.
Once the w/c ratio is established and the workability
or consistency needed for the specific design is
chosen, the rest should be simple manipulation with
diagrams and tables based on large numbers of trial
mixes.