Effect of constituents on rheological properties of fresh concrete-A review
TL;DR: In this article, a critical review on the rheological properties of fresh concrete in recent publications is revealed, and the applications of rheograph and workability box in mixture proportioning and quality control are also illustrated.
Abstract: The rheology is an effective tool to characterize workability, consistency, flowability, and predict stability, pumpability, shootability, pressure of formwork, multi-layer casting. This paper presents a critical review on the rheological properties of fresh concrete in recent publications. The applicable rheological models for the flow of concrete are revealed. The effects of constituents of fresh concrete, including cement, supplementary cementitious materials (fly ash, ground blast furnace slag, and silica fume), limestone powder, coarse and fine aggregates, and chemical admixtures (superplasticizer, viscosity modifying agent and air-entraining agent) on the rheological properties are discussed in detail. The applications of rheograph and workability box in mixture proportioning and quality control are also illustrated.
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TL;DR: In this article, the main required concrete states for extrusion and deposition processes are analyzed with respect to required performances and potential admixtures, and possible side effects and incompatibilities are discussed, as well as how they could be unconventionally used for printable concrete purposes.
301 citations
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TL;DR: In this paper, a large amount of studies are devoted to seeking synergies between FA, HCFA, granulated blast furnace slag (GBFS), and limestone, focusing on durability characteristics of composites cement containing FA and HCFA.
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TL;DR: Guo et al. as discussed by the authors provided insights for the future development of 3D printable cementitious materials for building and construction by controlling the basic inputs of materials to obtain desired structural performance.
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TL;DR: In this paper, the rheological and mechanical properties of 3D printing sulphoaluminate cementitious materials were investigated using response surface methodology (RSM) to achieve a favorable deformation rate and higher compressive strength.
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2,817 citations
Book•
15 Jun 1989
TL;DR: In this article, the authors discuss the importance of non-linearity solids and liquids rheology is a difficult subject for rheological research, and present some demonstrations of high extensional viscosity behaviour.
Abstract: 1) What is rheology? historical perspective the importance of non-linearity solids and liquids rheology is a difficult subject components of rheological research. 2) Viscosity practical ranges of variables which affect viscosity the shear-dependent viscosity of non-Newtonian liquids viscometers for measuring shear viscosity. 3) Linear viscoelasticity the meaning and consequences of linearity the Kelvin and Maxwell models the relaxation spectrum oscillatory shear relationships between functions of linear viscoelasticity methods of measurement. 4) Normal stresses the nature and origin of normal stresses typical behaviour of N 1 and N 2 observable consequences of N 1 and N 2 methods of measuring N 1 and N 2 relationships between viscometric functions and linear viscoelastic functions. 5) extensional viscosity importance of extensional flow theoretical considerations experimental methods experimental results some demonstrations of high extensional viscosity behaviour. 6) Rheology of polymeric liquids general behaviour effect of temperature on polymer rheology effect of molecular weight on polymer rheology effect of concentration on the rheology of polymer solutions polymer gels liquid crystal polymers. molecular theories the method of reduced variables empirical relations between rheological functions practical applications. 7) Rheology of suspensions the viscosity of suspensions of solid particles in Newtonian liquids the colloidal contribution to viscosity viscoelastic properties of suspensions suspensions of deformable particles the interaction of suspended particles with polymer molecules also present in the continuous phase computer simulation studies of suspension rheology. 8. Theoretical rheology basic principles of continuum mechanics successful applications of the formulation principles some general constitutive equations constitutive equations for restricted classes of flows simple constitutive equations of the Oldroyd/Maxwell type solution of flow problems.
2,569 citations
TL;DR: In this paper, the authors present a review of coal fly ash at the global level, focusing on its current and potential applications, including use in the soil amelioration, construction industry, ceramic industry, catalysis, depth separation, zeolite synthesis, etc.
1,167 citations
Book•
21 Jun 1999
TL;DR: In this article, the authors present a flowchart for mixture simulation, showing the relationship between mix composition and properties of concrete, including deformation of Hardened Concrete, compressive strength and tensile strength.
Abstract: 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
823 citations
TL;DR: In this article, a detailed analysis of the macroscopic behavior of fresh cement pastes is presented, showing that the largest critical strain can be associated with the network of colloidal interactions between cement particles and the smallest critical strain is associated with early hydrates, which form preferentially at the contact points between cement grains.
579 citations