Author: Rui ZhongPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Design, Characterization and Modeling of High Performance Pervious Concrete
Author: Rui ZhongCharacterization and Modelling of Previous Concrete
Author: Ricardo PieralisiPublisher:
ISBN:
Category :
Languages : en
Pages : 196
Book Description
Pervious concrete is a special material with high permeability usually obtained by reducing the amount of fine aggregates in the composition of concrete. The properties of pervious concrete not only depend on its composition but also on the construction methods. The compaction process has a direct influence on the values of permeability and mechanical properties achieved. In fact, depending on the level of compaction applied, the same composition might give a highly pervious or even an almost impervious concrete. The interest of the scientific and technical community about pervious concrete has increased significantly since the 90's. Despite the technological advances on this field, the definition of the most adequate composition and compaction process to comply with the requirements of each application is normally based on trial and error or previous experiences. The lack of composition design methods in the literature may be attributed to the high complexity of the factors that intervene in the final performance of pervious concrete, which may hardly be generalized for all practical situations. In this context, the objective of this PhD thesis is to achieve a deeper understanding about pervious concrete and promote a new composition design philosophy based on advanced numerical simulations to minimize the need of experimental tests. This work covers the main aspects of production and performance of pervious concrete, from the fresh to the hardened state. The first subject refers to the compaction process in the fresh state. An Evolutionary Lattice Model is developed for simplified 2D simulations. As a more realistic alternative, new constitutive laws are developed and implemented in Discrete Element Models for 3D simulations. To validate these models, experimental programs that emulate a controlled compaction were performed. The results confirm the representativeness of the models developed. The second subject focuses on the permeability of concrete in the hardened state. The meso-structure derived from 3D simulations of the compaction process in the previous subject are evaluated in terms of their permeability. Computational Fluid Dynamics models are used to simulate the water flow through the material. An experimental program is conducted with a constant head permeameter and different types of pervious concrete. The results obtained are used to validate the numerical models, confirming that it is possible to reproduce the real permeability results based on combined numerical simulations of the compaction process and of the water flow within the material. The third subject is centred on the mechanical properties of pervious concrete in the hardened state. A new constitutive law is developed and implemented in DEM to simulate the interaction between the connected particles that form the material. The meso-structure obtained as a result of the compaction simulations are used to assess numerically the expected mechanical properties of the pervious concrete. An experimental program is conducted to evaluate the compressive and indirect tensile strength of pervious concrete with different compositions and subjected to several degrees of compaction. The numerical results estimated with this constitutive law together with the meso-structure show good agreement with the experimental results. The studies conducted in this work confirm that it is also possible to predict the performance expected in reality. Consequently, the numerical tools might be used to accelerate the process of defining the concrete composition and the production process for each application.
Mix Design Optimization and Characterization of High-performance/high-strength Lightweight Concrete
Author: Brenton A. StonePervious Concrete: Characterization of Fundamental Properties and Simulation of Microstructure
Author: Felipe MontesPublisher:
ISBN: 9781109840506
Category : Concrete
Languages : en
Pages : 158
Book Description
The second part of this dissertation reviews the main characteristics of the microstructure of pervious concrete, specific surface area, pore size distribution and characteristics of cement paste that are relevant for the performance of pervious concrete. It follows with a discussion of the mathematical background necessary to define pervious concrete as a heterogeneous random porous material. This definition grants the use of tools of stochastic geometry and random binary fields in the description and further characterization of this material.
Constitutive Modelling of High Strength/high Performance Concrete
Author: fib Fédération internationale du bétonPublisher: fib Fédération internationale du béton
ISBN: 2883940827
Category : Technology & Engineering
Languages : en
Pages : 134
Book Description
High Strength/High Performance Concrete (HSC/HPC) continues to be the object of particular interest and extensive research, and its use in construction is increasing continuously. fib Bulletin 42 summarises the available information on the material behaviour of HSC/HPC, and develops a set of code-type constitutive relations as an extension of CEB-FIP Model Code 1990. Literature on experimental data and international guidelines, standards and recommendations were reviewed, and already-existing constitutive relations and models were evaluated. In addition to a number of material laws chosen and adjusted for this report, some new constitutive relations were developed based on the collected data. The criteria for the choice of the existing relations as well as the development of the new constitutive relations involved their simplicity and operationality (code-type mathematical formulations). Furthermore, they had to be physically sound and if possible describe the behaviour of both high-performance and normal strength concretes by a unique relation. Finally, compliance with the specifications given in the CEB-FIP Model Code 1990 was examined. This State-of-art report is intended for engineers and represents a summary of the relevant knowledge available to and possessed by the members of the Task Group at the time of its drafting.
Report on Pervious Concrete
Author: ACI Committee 522Publisher:
ISBN: 9780870313646
Category : Lightweight concrete
Languages : en
Pages : 38
Book Description
"This report provides technical information on pervious concrete's application, design methods, materials, properties, mixture proportioning, construction methods, testing, and inspection. The term 'pervious concrete' typically describes a near-zero-slump, open-graded material consisting of portland cement, coarse aggregate, little or no fine aggregate, admixtures, and water." [p. 1]
Characterization of the Behavior of Ultra-high Performance Concrete
Author: Ultra-High Performance Concrete
Author: CAIJUN. WU SHI (ZEMEI. BANTHIA, NEMKUMAR.)Publisher:
ISBN: 9781032067322
Category :
Languages : en
Pages : 0
Book Description
This is the first book to cover the design, performance, and applications of UHPC, including characterization, mixture selection and design, construction; setting and hardening, dimensional stability, static and dynamic properties, durability, and self-healing; and applications to high-rise, large-span, and heavy load-bearing structures.
Pervious Concrete Pavements
Author: Paul D. TennisPublisher:
ISBN: 9780893122423
Category : Pavements, Concrete
Languages : en
Pages : 28
Book Description
2nd International Conference on Smart Sustainable Materials and Technologies (ICSSMT 2023)
Author: M. SumeshPublisher: Springer Nature
ISBN: 3031500245
Category :
Languages : en
Pages : 202
Book Description