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2E8 Materials (Civil Engineering Component) Civil Engineering Materials Department of Civil, Structural and Environmental Engineering Trinity College Dublin.

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Presentation on theme: "2E8 Materials (Civil Engineering Component) Civil Engineering Materials Department of Civil, Structural and Environmental Engineering Trinity College Dublin."— Presentation transcript:

1 2E8 Materials (Civil Engineering Component) Civil Engineering Materials Department of Civil, Structural and Environmental Engineering Trinity College Dublin Dr. Roger P. West (TCD) Mr. Peter Flynn (Arup)

2 2E8 Materials (Civil Engineering Component) Section A:Concrete A1Basic Materials: A2Fresh Concrete Properties: A3Hardened Concrete Properties: A4Concrete Mix Design: A5Reinforced Concrete: A6Pre-stressed Concrete:

3 2E8 Materials (Civil Engineering Component) Section A.4Concrete Mix Design 1.Mix Requirements 2.EN206 – Concrete Specification 3.Trial Mixes 4.Cube Variability 5.Characteristic Strength 6.Standard Deviation & Margin 7.Target Mean Strength

4 2E8 Materials (Civil Engineering Component) 1.Mix Requirements Section A.4Concrete Mix Design

5 2E8 Materials (Civil Engineering Component) 1.Mix Requirements Section A.4Concrete Mix Design Essential Properties of Hardened Concrete; Strength Durability Other requirements; Satisfactory workability Stiffening time Cohesiveness

6 2E8 Materials (Civil Engineering Component) 1.Mix Requirements

7 2E8 Materials (Civil Engineering Component) 1.Mix Requirements Section A.4Concrete Mix Design Strength Defined by the Characteristic Compressive Strength; Defined by the crushing strength of 150mm cubes when 28 days old. Strength below which not more than 5% of test results fall. Generally referred to as 28 day strength Concrete must be designed to have an average strength well in excess of the characteristic strength required.

8 2E8 Materials (Civil Engineering Component) 1.Mix Requirements Section A.4Concrete Mix Design Strength

9 2E8 Materials (Civil Engineering Component) 1.Mix Requirements Section A.4Concrete Mix Design Strength Grade (N/mm 2 ) Characteristic Strength (N/mm 2 ) Lowest Grade for Compliance with Appropriate Use <7 7.0 Special Purpose (such as energy absorption), Plain Concrete < Reinforced Concrete with Lightweight Aggregates Reinforced Concrete with normal weight aggregate & Prestressed Concrete with post tensioned tendons Prestressed Concrete with pretensioned tendons

10 2E8 Materials (Civil Engineering Component) 1.Mix Design Section A.4Concrete Mix Design Types of Mixes (BS5328 /ISEN206) Designed Mix Performance specified by purchaser Producer is responsible for the design & mix proportions Must conform to ISEN206 Prescribed Mix Mix Proportions are specified by purchaser

11 2E8 Materials (Civil Engineering Component) 1.Mix Design Section A.4Concrete Mix Design Types of Mixes (BS5328 / ISEN206) Standard Prescribed Mix Admixtures are not permitted Producer is responsible for the design & mix proportions Must conform to ISEN206 Designated Mix Wide-ranging concretes for almost every type of concrete construction Specifications as per ISEN206/BS8500 Third Party QA accreditation – No cube testing on site

12 2E8 Materials (Civil Engineering Component) 1.Mix Design Section A.4Concrete Mix Design All mix designs require a trial mix The proportions of which may need modification in the light of experience Empirical Approach

13 2E8 Materials (Civil Engineering Component) 1.Standards


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