Conservation of buildings and building materials Books

Book SynopsisAmong different approaches that can be considered for concrete rehabilitation, bonded overlays are often the most economical alternative. The primary purpose of overlays is to extend the life of the candidate structures, either by restoring the quality and integrity of the surface and/or the re-establishing or improving the load-carrying capacity. Nevertheless, the durability of bonded overlay systems still draws concerns in the technical community because of bond sustainability problems encountered in a number of cases. At this time, there is still no accepted design approach or methodology that can warrant the practitioner a successful outcome of the repair. This State-of-Art report summarizes the findings with respect to all aspects involved in the overlaying process.Table of ContentsTC 193-RLS – Technical Committee Members; Foreword; 1 Introduction, by J.-L. Granju, B. Bissonnette and L. Courard; 1.1 Introduction; 2 Overlay Design Process, by D.W. Fowler and M. Treviño; 2.1 Purpose of Overlays; 2.2 Materials Selection; 2.2.1 Slabs on Grade/Pavements; 2.2.2 Structural Slabs and Decks; 2.3 Joints; 2.3.1 Slabs on Grade/Pavements; 2.3.2 Structural Slabs and Decks; 2.4 Construction Procedures; 2.4.1 Steel Placement; 2.4.2 Environmental Effects; 2.4.3 Curing; 2.5 The BCO Process; 2.6 Project Selection; 2.6.1 Design; 2.6.2 Construction; 2.6.3 Quality Control/Quality Assurance (QA/QC); 2.7 Conclusions; References; 3 Condition Evaluation of the Existing Structure Prior to Overlay, by L. Courard, M. Treviño and B. Bissonnette; 3.1 Introduction; 3.2 Assessment of Pavement/Substrate Base; 3.2.1 Principles of Evaluation; 3.2.2 Condition Survey of Distress; 3.2.3 Test Methods for Pavement/Substrate Base; 3.3 Assessment of Structural Slab/Deck/Support; 3.3.1 Introduction; 3.3.2 Condition Survey of Distress; 3.3.3 Structural Evaluation; 3.3.4 Material Evaluation; 3.3.5 Test Methods and Procedures; 3.3.6 Methods for the Determination of Superficial Porosity; 3.4 Feasibility Analysis; References; 4 Bond, by J. Silfwerbrand, H. Beushausen and L. Courard; 4.1 Classification of Bond 4.2 Definition of Bond Strength 4.3 Fundamental Bond Mechanisms; 4.4 Factors Affecting Bond; 4.4.1 Concrete Properties; 4.4.2 Removal of Deteriorated Concrete; 4.4.3 Concrete Removal behind Rebars, Rebar Cleaning, and Rebar Replacement; 4.4.4 Cleaning after Concrete Removal; 4.4.5 Surface Properties; 4.4.6 Surface Preparation; 4.4.7 Bonding Agents; 4.4.8 Mechanical Devices Crossing the Interface; 4.4.9 Concrete Placement; 4.4.10 Concrete Curing; 4.4.11 Short-term Bond Properties; 4.4.12 Long-term Bond Properties; 4.4.13 Traffic Vibrations; 4.5 Test Methods; 4.5.1 General; 4.5.2 Shear Test Methods; 4.5.3 Comparisons between Tensile Bond Strength and Shear Bond Strength; 4.6 Evaluation; 4.7 Design Strength Values; 4.8 Performance Requirements; References; 5 Structural Behaviour, by E. Denarié, J. Silfwerbrand and H. Beushausen; 5.1 Introduction; 5.2 Actions; 5.3 Performance of Composite Structures; 5.4 Different Forms of Restraint and Effect of Joints; 5.5 Mechanical Behaviour of Composite Structures with Cementitious Materials of Different Ages; 5.5.1 Overview of Existing Analytical Models; 5.5.2 Normal Stresses Due to Differential Shrinkage in Composite Beams with Complete Bond; 5.5.3 Shear Stresses Due to Differential Shrinkage in Composite Beams; 5.5.4 Normal and Shear Stresses Due to Differential Shrinkage in Composite Beams with Incomplete Bond; 5.6 Experimental Tests; 5.6.1 Swedish Tests on Mechanically Loaded Concrete Beams; 5.6.2 Swedish Tests on Concrete Beams Subjected to Differential Shrinkage; 5.6.3 Swedish Tests on Concrete Slabs; 5.6.4 Tests at EPFL on Composite Beams with Normal Concretes of Different Ages; 5.6.5 Other Tests; 5.7 On Restrained Shrinkage Set-ups; 5.8 Numerical Modelling; 5.9 Conclusions; 5.10 Outlook for Future Research; References; 6 Debonding, by A. Turatsinze, H. Beushausen, R. Gagné, J.-L. Granju, J. Silfwerbrand and R. Walter; 6.1 Introduction; 6.2 Impact of Debonding; 6.3 Brief Summary of Debonding; 6.4 Methods for Monitoring Debonding; 6.4.1 Non-destructiveMethods; 6.4.2 Semi-destructive Methods; 6.4.3 Laboratory Tests; 6.5 Debonding Mechanism; 6.6 Debonding Modeling; 6.7 Role of Reinforcement of Overlays; 6.7.1 In Situ Findings; 6.7.2 Need to Distinguish between “First Monotonic Loading” and “Shrinkage-Pre-cracking Plus Fatigue”; 6.8 Crack Propagation and Crack Opening; 6.8.1 First Monotonic Loading; 6.8.2 Shrinkage-Pre-Cracking and Fatigue Loading; 6.9 Special Overlays; 6.9.1 Stang andWalter’s Results [11, 64, 65]; 6.9.2 Anchoring of the Overlay; 6.10 Boundaries and Joints of the Overlays; 6.10.1 Boundaries and Full Depth Joints; 6.10.2 Sawn Joints; 6.11 Conclusion; References; 7 Design, by M. Treviño, J.-L. Granju, H. Beushausen, A. Chabot, H. Mihashi and J. Silfwerbrand; 7.1 Introduction; 7.2 Design for Sufficient Strength; 7.2.1 Overview; 7.2.2 Design Concepts; 7.2.3 Current Overlay Design Procedures; 7.2.4 Reinforcement Design of Overlaid Continuously Reinforced Concrete Pavements (CRCP); 7.2.5 BCO Design Procedures in Other Countries; 7.2.6 Summary and Conclusions; 7.3 Design to Prevent Debonding; 7.3.1 Introduction; 7.3.2 USA Recommendations; 7.3.3 European Requirements; 7.3.4 Japanese Requirements; 7.3.5 Swedish Practice; 7.3.6 Expected Design Shear Strength; 7.4 Conclusion; References; 8 Practice and Quality Assurance, by M. Vaysburd, B. Bissonnette and R. Morin; 8.1 Scope and Definitions; 8.2 Importance of Substrate Surface Preparation; 8.2.1 General; 8.2.2 Safety; 8.3 Concrete Removal; 8.3.1 General; 8.3.2 Removal Methods; 8.3.3 Advantages and Limitations of Concrete Removal Methods; 8.4 Substrate Surface Preparation; 8.4.1 General; 8.4.2 Pre-Overlay Repairs; 8.4.3 Surface; 8.4.4 Moisture Conditioning of the Substrate Prior to Overlay/Repair; 8.4.5 Maintenance of the Prepared Substrate; 8.4.6 Quality Control of Surface Preparation; 8.5 Application; 8.5.1 General; 8.5.2 Workmanship; 8.5.3 Basic Requirement; 8.5.4 Repair Placement; 8.5.5 Consolidation; 8.5.6 Surface Finishing; 8.5.7 Curing; 8.6 Quality Assurance/Construction Inspection; 8.6.1 Scarification and Removal of Unsound Concrete; 8.6.2 Substrate Preparation; 8.6.3 Placement and Consolidation; References; 9 Maintenance and Repair of Overlays, by D.W. Fowler; 9.1 Types and Causes of Distress; 9.2 Evaluation of Damage; 9.3 Repair Methods; 9.3.1 Cracks; 9.3.2 Delaminated Concrete; 9.3.3 Spalls; 9.4 Conclusions; 10 Conclusion, by B. Bissonnette, L. Courard and J.-L. Granju.

Read more less

Book Synopsis

Read more less

Book SynopsisCairo, 'Mother of the World': its vividly diverse neighborhoods and building styles reveal its cosmopolitan energy and reflect the myriad of economic, political, and cultural forces that have shaped the city over the centuries. So impressed was Khedive Ismail after a visit to Haussman's 'new' Paris in 1867 that he decided to build a modern city along the same architectural lines and aesthetics, and brought European architects to Cairo to initiate Egypt's most dynamic building period since medieval times. The stunning buildings of late-nineteenth- and early-twentieth-century Cairo remain, but they are neglected, threatened by pollution, and are being pulled down for concrete highrises and parking lots. Paris along the Nile captures in 200 black-and-white photographs the architectural jewels of 'modern' Cairo.

Read more less

Book SynopsisThis book is designed to be an inclusive for the best practice approach to building maintenance management, where the processes, procedures and operational systems meet a high standard of professional and academic competence. It offers a different perspective on building maintenance management by presenting the schematic building maintenance value chain model and it’s implementation in Malaysian university buildings. The findings show an improvement to building performance, lower maintenance cost, building sustainability and increased maintenance service user satisfaction. The learning outcomes and summaries provided for each chapter and the extensive use of tables and figures add to the readability of the text. Though the book is based on data from Malaysia, it is useful for a much wider audience, and the informal writing style makes it an interesting reference source. This book is valuable for readers who are practitioners, professionals and for academic institutions that offer courses in the building field, including architecture, quantity surveying, civil engineering, building and facility management, property management, real estate. It will also be of interest to governments and others involved in the construction industry.Table of ContentsOverview.- An Overview of the Construction Industry.- Maintenance of Academic Buildings.- Malaysian Education System and University Buildings.- Building Maintenance Processes, Principles, Procedures, Practices and Strategies.- Methodological Issues.- Sustainability Maintenance Initiatives.- Conclusions and Recommendations.

Read more less

Book Synopsis

Read more less