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First RILEM International Conference on Concrete and Digital Fabrication - Digital Concrete 2018
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First RILEM International Conference on Concrete and Digital Fabrication - Digital Concrete 2018
von: Timothy Wangler, Robert J. Flatt
Springer-Verlag, 2018
ISBN: 9783319995199
355 Seiten, Download: 77272 KB
 
Format:  PDF
geeignet für: Apple iPad, Android Tablet PC's Online-Lesen PC, MAC, Laptop

Typ: B (paralleler Zugriff)

 

 
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Inhaltsverzeichnis

  Preface 6  
  Organization 8  
     Conference Committees 8  
     Conference Chair 8  
     Conference Vice Chair 8  
     International Scientific Committee 8  
     Local Organizing Committee 9  
  Contents 11  
  RILEM Publications 15  
     RILEM Proceedings (PRO) 15  
     RILEM Reports (REP) 24  
  Materials and Processing 26  
  Fresh and Hardened Properties of 3D Printable Geopolymer Cured in Ambient Temperature 27  
     Abstract 27  
     1 Introduction 27  
     2 Materials and Methods 28  
        2.1 Materials and Mixture Proportions 28  
        2.2 3D Printing Apparatus 29  
        2.3 Printing of 3D Printable Geopolymer 29  
        2.4 Characterization Methods 29  
     3 Results and Discussions 31  
        3.1 Extrudability 31  
        3.2 Open Time 31  
        3.3 Shape Retention Ability 32  
        3.4 Compressive Strength 32  
     4 Conclusion 34  
     References 35  
  Evolution of Concrete/Formwork Interface in Slipforming Process 36  
     Abstract 36  
     1 Introduction 36  
     2 Interfacial Behavior of Fresh Concrete: Physical Phenomena 38  
        2.1 Chemistry Origin and Hydration Consequences 38  
        2.2 Pore Water Pressure and Granular Stress (Terzaghi Equation) 39  
     3 Experimental Procedures 40  
        3.1 Materials and Mixing Procedure 40  
        3.2 Device and Procedure 40  
     4 Experimental Results and Discussions 41  
        4.1 Cement Hydration Characterization 41  
        4.2 Tangential Stress 42  
        4.3 Friction Law 44  
        4.4 Hypothesis of Mechanisms 45  
     5 Conclusion and Perspectives 46  
     Acknowledgements 46  
     References 46  
  Experience in Online Modification of Rheology and Strength Acquisition of 3D Printable Mortars 48  
     Abstract 48  
     1 Introduction 48  
     2 Materials and Methods 49  
        2.1 3D Printable Formulations and Preparation 49  
        2.2 Lab-Scale Extrusion Testing 51  
        2.3 Early Age Characterization Methods 52  
     3 Results 54  
        3.1 Texturometry 54  
        3.2 Scissometry 57  
        3.3 Lab Scale Extrusion 58  
     4 Discussion 59  
     Acknowledgements 61  
     References 61  
  A Framework for Performance-Based Testing of Fresh Mixtures for Construction-Scale 3D Printing 63  
     Abstract 63  
     1 Introduction 63  
     2 Experimental Program 64  
        2.1 The Step-by-Step Testing Procedure 64  
        2.2 Concrete Printing Setup, and Printing Mixtures Proportions 66  
     3 Testing and Results 67  
     4 Future Work 72  
     5 Conclusions 74  
     References 74  
  Characterization of 3D Printing Mortars Made with OPC/CSA Mixes 77  
     Abstract 77  
     1 Introduction 77  
     2 Materials and Methods 78  
     3 Results 80  
     4 Conclusion 83  
     Acknowledgments 83  
     References 83  
  Rheological and Water Transport Properties of Cement Pastes Modified with Diutan Gum and Attapulgite/Palygorskite Nanoclays for 3D Concrete Printing 85  
     Abstract 85  
     1 Introduction 85  
     2 Materials and Methods 86  
        2.1 Materials 86  
        2.2 Methods 87  
     3 Results 88  
        3.1 Sustained Stress Results 88  
        3.2 Water Retention Capacity 89  
     4 Conclusion 92  
     Acknowledgments 92  
     References 92  
  Rheological Control of 3D Printable Cement Paste and Mortars 94  
     Abstract 94  
     1 Introduction 94  
     2 Materials and Methods 95  
     3 Results and Discussion 97  
        3.1 Printing Mixtures A and B 97  
        3.2 Rheometry 98  
        3.3 Simulations of Flow Properties 101  
     4 Conclusion 102  
     References 103  
  Adapting Smart Dynamic Casting to Thin Folded Geometries 105  
     Abstract 105  
     1 Introduction 105  
     2 Slipforming Process Model 107  
     3 Materials and Methods 108  
        3.1 Initial Robotic Experiments 109  
        3.2 Offline Tests 110  
        3.3 Online Tests 111  
        3.4 Robotic Experiment as Material Evaluation 111  
     4 Experimental Results 112  
        4.1 Initial Robotic Experiments 112  
        4.2 Offline Tests 112  
        4.3 Online Tests 113  
        4.4 Robotic Experiment as Material Evaluation 113  
     5 Discussion of Results from Online, Offline and Robotic Experiments 114  
     6 Conclusion 116  
     Acknowledgements 116  
     References 116  
  Enhancing Printable Concrete Thixotropy by High Shear Mixing 118  
     Abstract 118  
     1 Introduction 118  
     2 Methods and Materials 119  
        2.1 Materials 119  
        2.2 Mixing Protocol 119  
        2.3 Rheological Measurements 119  
        2.4 Isothermal Calorimetry 120  
        2.5 Dynamic Light Scattering Measurements 120  
     3 Results 120  
        3.1 Rheological Measurements 120  
        3.2 Isothermal Calorimetry 120  
        3.3 Dynamic Light Scattering Measurements 123  
     4 Discussion 123  
     5 Conclusion 124  
     References 124  
  Discrete Element Simulations of Rheological Response of Cementitious Binders as Applied to 3D Printing 126  
     Abstract 126  
     1 Introduction 126  
     2 Discrete Element Method (DEM) and the Model Used 127  
        2.1 Burger’s Model 127  
        2.2 Calibration of Burger’s Model Using Mini Slump Test 129  
     3 Extrusion Experiments and DEM Modeling 131  
        3.1 Extrusion-Based 3D Printing and Extrusion Rheology 131  
        3.2 DEM Modeling of Extrusion Rheology and Printing 133  
     4 Conclusions 135  
     Acknowledgments 135  
     References 136  
  Mechanics and Structure 137  
  Three-Dimensional Printing Multifunctional Engineered Cementitious Composites (ECC) for Structural Elements 138  
     Abstract 138  
     1 Introduction 138  
     2 Experimental Program 140  
        2.1 Materials 140  
        2.2 Mix Processing 141  
        2.3 Test Specimens 141  
        2.4 Test Methods 143  
     3 Experimental Results and Discussions 145  
        3.1 Printability 145  
        3.2 Nitrogen Oxides Abatement 145  
        3.3 Mechanical Properties 146  
     4 Conclusions 149  
     Acknowledgements 150  
     References 150  
  Large Scale Testing of Digitally Fabricated Concrete (DFC) Elements 152  
     Abstract 152  
     1 Introduction 152  
     2 TU/e 3D Concrete Printing and Scale Effects 153  
     3 Nyborg Studio 155  
        3.1 Project and Design 155  
        3.2 Test Program en Specimens 156  
        3.3 Printing 157  
        3.4 Observations Before Testing 158  
        3.5 Vertical Flexural Test 159  
        3.6 Compression Test 160  
        3.7 Impact Test 162  
        3.8 Overall Conclusion on Structural Performance 162  
     4 Bicycle Bridge Gemert 163  
        4.1 Project and Design 163  
        4.2 Test Program 164  
        4.3 Printing 164  
        4.4 4-Point Bending Test 165  
        4.5 In-Situ Test 165  
     5 Discussion and Conclusion 168  
     Acknowledgements 169  
     References 169  
  Method of Enhancing Interlayer Bond Strength in 3D Concrete Printing 171  
     Abstract 171  
     1 Introduction 171  
     2 Materials and Methods 172  
        2.1 Mix Proportions 172  
        2.2 3D Printing Process 173  
        2.3 Testing Methods 174  
     3 Results and Discussion 175  
        3.1 Cube Tests 175  
        3.2 Flow Table Tests 175  
        3.3 Interlayer Bond Strength 176  
     4 Conclusion 178  
     Acknowledgements 178  
     References 179  
  Exploiting the Potential of Digital Fabrication for Sustainable and Economic Concrete Structures 180  
     Abstract 180  
     1 Introduction 180  
     2 Requirements of Mass-Market Concrete Structures 182  
        2.1 Necessity of Reinforcement 182  
        2.2 Limited Use of Geometrical Complexity 182  
     3 Benefits of Digital Fabrication for Structural Concrete 183  
        3.1 Key Potentials 183  
        3.2 Crack Initiators by 3D Printing Weak Interfaces 184  
     4 Conclusion and Outlook 188  
     Acknowledgements 189  
     References 189  
  Alternative Reinforcements for Digital Concrete Construction 190  
     Abstract 190  
     1 3D-Printed Steel Reinforcement 190  
        1.1 Introduction 190  
        1.2 Materials, Manufacture and Testing Techniques 191  
        1.3 Experimental Results 191  
     2 3D-Printed Strain-Hardening Cement-Based Composites 193  
        2.1 Introduction 193  
        2.2 Materials, Manufacture and Testing Techniques 194  
        2.3 Experimental Results 195  
     3 Summary 197  
     References 198  
  Additive Manufacturing and Characterization of Architectured Cement-Based Materials via X-ray Micro-computed Tomography 199  
     Abstract 199  
     1 Introduction 200  
     2 Methods 200  
        2.1 3D-Printing Setup 200  
        2.2 Ink Design, Mixing Procedure, and Curing 202  
        2.3 Slicing and Design 203  
        2.4 Micro-CT and Scanning Specimens 203  
     3 Results and Discussion 204  
        3.1 3D-Printed Lamellar Architecture Micro-CT (0.4X and 4X Scans) 204  
        3.2 Cast Specimen in 0.4X Micro-CT (0.4X Scan) 209  
     4 Summary 211  
     Acknowledgements 211  
     References 211  
  Hardened Properties of 3D Printable ‘One-Part’ Geopolymer for Construction Applications 213  
     Abstract 213  
     1 Introduction 213  
     2 Experimental Procedures 215  
        2.1 Materials and Mixture Proportions 215  
        2.2 Mixing, Printing, Curing and Testing of Specimens 215  
     3 Results and Discussion 217  
        3.1 Compressive Strength 217  
        3.2 Flexural Strength 218  
        3.3 Inter-layer Strength 219  
     4 Conclusions 220  
     Acknowledgements 221  
     References 221  
  Bond Strength in 3D Printed Geopolymer Mortar 223  
     Abstract 223  
     1 Introduction 223  
     2 Materials and Methods 224  
     3 Results and Discussion 226  
     4 Conclusions 228  
     Acknowledgement 229  
     References 229  
  Potentials of Steel Fibres for Mesh Mould Elements 230  
     Abstract 230  
     1 Introduction 230  
        1.1 Background About the Mesh Mould Project 230  
        1.2 Mechanical Behaviour of Mesh Mould Elements 231  
     2 Experimental Program 233  
        2.1 Test Specimens 233  
        2.2 Experimental Setup 234  
        2.3 Material Properties 234  
     3 Results and Discussion 236  
        3.1 Predicted Behaviour of the Mesh 236  
        3.2 Four-Point Bending Test 236  
     4 Conclusions and Outlook 238  
     Acknowledgments 239  
     References 239  
  Capillary Water Intake by 3D-Printed Concrete Visualised and Quantified by Neutron Radiography 240  
     Abstract 240  
     1 Introduction 240  
     2 Experimental 241  
     3 Results and Discussion 243  
        3.1 Fine-Grained 3D-Printed Concrete (Mixture A) 243  
        3.2 Portland Cement-Based 3D-Printed Concrete with Internal Curing by SAP (Mixture G) 245  
     References 247  
  Corrosion Challenges and Opportunities in Digital Fabrication of Reinforced Concrete 248  
     Abstract 248  
     1 Introduction 248  
     2 Corrosion Challenges in Digital Fabrication 249  
        2.1 Corrosion Challenges in “Steel Welding” Technology 250  
        2.2 Corrosion Challenges in “Slipforming” Technology 251  
        2.3 Corrosion Challenges in “3D Printing by Layer Extrusion” Technology 253  
     3 Opportunities for Corrosion Protection 253  
     4 Conclusion 254  
     References 255  
  The Effect of Print Parameters on the (Micro)structure of 3D Printed Cementitious Materials 257  
     Abstract 257  
     1 Introduction 257  
     2 Materials and Methods 258  
        2.1 Materials and Mix Composition 258  
        2.2 3D Printing Process 258  
        2.3 Surface Roughness 259  
        2.4 Mechanical Properties Testing 260  
        2.5 Porosity Measurements and Pore Size Distribution 261  
     3 Results and Discussion 262  
        3.1 Surface Roughness 262  
        3.2 Compressive Strength 262  
        3.3 Inter-layer Bonding Strength 263  
        3.4 Microstructure and Porosity 264  
     4 Conclusions 266  
     Acknowledgements 267  
     References 267  
  Compressive Strength and Dimensional Accuracy of Portland Cement Mortar Made Using Powder-Based 3D Printing for Construction Applications 268  
     Abstract 268  
     1 Introduction 268  
     2 Experimental Procedures 271  
        2.1 Materials 271  
        2.2 Printing Process and Test Methods 271  
     3 Results and Discussions 273  
        3.1 Linear Dimensional Accuracy 273  
        3.2 Compressive Strength 274  
     4 Conclusions 275  
     References 276  
  Impact of 3D Printing Direction on Mechanical Performance of Strain-Hardening Cementitious Composite (SHCC) 278  
     Abstract 278  
     1 Introduction 278  
     2 Materials and Methods 280  
        2.1 Experimental Program 280  
        2.2 Micromechanical Modelling 281  
     3 Results and Discussion 282  
        3.1 Experimental Results on Mechanical Properties 282  
        3.2 Modelling of Fibre-Bridging Constitutive Relations of SHCCs 284  
     4 Conclusions 286  
     References 287  
  Applications and More 289  
  Feasibility of Using Low CO2 Concrete Alternatives in Extrusion-Based 3D Concrete Printing 290  
     Abstract 290  
     1 Introduction 290  
     2 Binder Mix and Fresh Property of 3D Printable Concrete 291  
        2.1 Literature Survey of 3D Printable Binder Mix 291  
        2.2 Fresh Property of 3D Printable Concrete 291  
     3 Constraint and Opportunity to Develop SCMs-Based Printable Concrete 294  
     4 Conclusion 295  
     References 296  
  Experimental Investigation on the Mechanical Strength and Thermal Conductivity of Extrudable Foamed Concrete and Preliminary Views on Its Potential Application in 3D Printed Multilayer Insulating Panels 298  
     Abstract 298  
     1 Introduction 298  
     2 Materials and Methods 299  
     3 Results and Discussion 300  
        3.1 Extrusion Process 300  
        3.2 Compressive Strength 301  
        3.3 Indirect Tensile Strength 302  
        3.4 Thermal Conductivity 303  
     4 Outlook: Multilayer Insulating Panels 306  
     5 Conclusion 306  
     References 307  
  Development of a Shotcrete 3D-Printing (SC3DP) Technology for Additive Manufacturing of Reinforced Freeform Concrete Structures 308  
     Abstract 308  
     1 Introduction 308  
        1.1 Additive Manufacturing with Concrete 309  
        1.2 Potential of Shotcrete 3D Printing as an Additive Manufacturing Technique 309  
        1.3 Challenges of Shotcrete 3D Printing 310  
     2 Offline Process Control Based on Experimental Knowledge 311  
     3 Online Measurement and Process Control for SC3DP 312  
        3.1 Measurement and Control Concepts for Layer-Based Additive Manufacturing 313  
        3.2 Online Geometry Measuring for Shotcrete 3D Printing 314  
        3.3 Control Concept for Shotcrete 3D Printing and Experimental Implementation 314  
     4 Case Study: Multidirectional Printing and Introducing of Reinforcement 316  
     5 Conclusion 317  
     References 318  
  Challenges of Real-Scale Production with Smart Dynamic Casting 320  
     Abstract 320  
     1 Introduction 320  
     2 Fabrication and Challenges 321  
        2.1 Overall Fabrication Concept 322  
     3 Fabrication Challenges 323  
        3.1 Formwork, Actuation and Friction 323  
        3.2 Material Processing 324  
     4 Design and Production 326  
        4.1 Material Characterization 326  
        4.2 Structural Design 327  
        4.3 Material Processing Challenges: Reinforcement Integration 329  
     5 Conclusion 330  
     Acknowledgments 330  
     References 330  
  The Tectonics of Digitally Fabricated Concrete. A Case for Robotic Hot Wire Cutting 332  
     Abstract 332  
     1 Introduction 332  
        1.1 Form, Surface and Composition 332  
     2 Digital Fabrication Technologies in Concrete Architecture 333  
        2.1 Evaluating Existing and Emerging Solutions 333  
        2.2 Expanding Form, Surface and Composition 335  
        2.3 Critical Issues for Digital Fabrication in Concrete 336  
     3 A Case for Robotic Hot Wire Cutting 337  
        3.1 Description 337  
        3.2 Ruled Concrete Panels 337  
        3.3 The CorkCrete Arch 339  
     4 Conclusion 340  
     Acknowledgements 341  
     References 341  
  Compliance, Stress-Based and Multi-physics Topology Optimization for 3D-Printed Concrete Structures 344  
     Abstract 344  
     1 Introduction 344  
     2 Compliance-Based Topology Optimization 347  
     3 Stress-Based Topology Optimization 349  
     4 Multi-physics Topology Optimization 350  
     5 Conclusions and Final Remarks 351  
     Acknowledgements 352  
     References 352  
  Author Index 354  


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