The design of concrete mixes is becoming increasingly complex, with the addition of new materials in the compounds, such as organic admixtures, fibres and supplementary cementitious materials. Moreover, the list of properties which concretes are required to possess for certain applications has increased, and interest is developing in rheology, durability, deformability and whole-life behaviour.
This book presents a number of simple models for the understanding of a concrete system, and provides the techniques for developing more sophisticated models for the practical design of concrete mixes.
1. Packing Density and Homogeneity of Granular Mixes 1.1. Virtual Packing Density of a granular mix 1.2. Actual Packing Density - The Compressible Packing Model (CPM) 1.3. Effect of Boundary Conditions on the Mean Packing Density 1.4. Granular Mixes of Maximum Packing Density 1.5. Segregation of Granular Mixes 1.6. Summary 2. Relationships Between Mix Composition and Properties of Concrete 2.1. Fresh Concrete Properties 2.2. Adiabatic Temperature Rise 2.3. Compressive Strength 2.4. Tensile Strength 2.5. Deformability of Hardened Concrete 2.6. Factors Affecting Concrete Permeability 2.7. Summary: the various types of granular system to be considered in concrete mix design 3. Concrete Constituents: Relevant Parameters 3.1. Aggregate 3.2. Cement 3.3. Mineral Admixtures (supplementary cementitious materials) 3.4. Plasticizers/Superplasticizers 4. Mix-Design of Concrete 4.1. Specifying a Concrete for a Given Application 4.2. Solution of the Mix-Design Problem 4.3. Questions relating to the Aggregate Skeleton 4.4. Questions Relating to the Binders 4.5. Stability of Concrete in an Industrial Process 4.6. Review of Some Standard Methods in the Light of the Present Approach 5. Applications: Various Concrete Families 5.1. Preliminary Simulations: From Normal-Strength to Very High-Strength Concretes 5.2. Normal-Strength Structural Concrete 5.3. High-Performance Concrete 5.4. Concretes with Special Placing Methods 5.5. Concretes with Special Composition Conclusion Appendix: flowchart for mixture simulation