Since the introduction of the Superpave mix design procedure, there has been considerable
research to refine the design procedure so that laboratory tests and procedures used during
the hot-mix asphalt (HMA) mix design process relate better to actual field performance. Also, a
number of agencies have been concerned with the lack of a proof test for validating the
volumetric properties. Many have expressed a desire for a truly simple mix test that could be
employed at the HMA plant lab level.
These issues were explored in a workshop at the 85th Annual Meeting of the
Transportation Research Board (TRB). The papers in this document were written following the
workshop and are based on the presentations; the papers have not undergone a formal peer
review.
The first paper offers a state-of-the-practice for Superpave mix design and specification,
which is based on an in-depth survey of the regional User–Producer Groups. It includes a
summary of changes made to the Superpave mix design procedure as a result of NCHRP
research findings, Expert Task Group/American Association of State Highway and
Transportation Officials (ETG/AASHTO) recommendations, and individual state experience.
The remaining papers deal with other tools for mix design and evaluating HMA during
production that are relatively simple and implementable. This includes such things as the Bailey
method of gradation evaluation, use of the Superpave gyratory compactor to assess performance,
and use of the locking point to establish NDesign. In addition, other mix tests that show some
potential as practical tools for use in the verification of mix designs and the quality control of
HMA production are offered. These changes and new tools are intended to improve the field
performance of HMA.
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Soil is matter in its own right. Its nature can be captured by means of monotonous, cyclic and strange attractors. Thus material properties are defined by the asymptotic response of sand- and clay-like samples to imposed deformations and stresses. This serves to validate and calibrate elastoplastic and hypoplastic relations with comparative plots. Extensions capture thermal and seismic activations, limitations occur due to localizations and skeleton decay.Attractors in the large characterize boundary value problems from model tests via geotechnical operations up to tectonic evolutions. Validations of hypoplastic calculations are shown with many examples, possible further applications are indicated in detail. This approach is energetically justified and limited by critical points where the otherwise legitimate continuity gets lost by localization and decay. You will be fascinated by the fourth element although or just as it is so manifold.
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Design of 5,000 Gal. Elevated Tank ( conical bottom ) using Staad Pro.
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Posted by: peixoto - 01-21-2011, 10:03 AM - Forum: Archive
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Creativity and innovation: the structural engineer's contribution to design
# Full title: Creativity and innovation: the structural engineer's contribution to design
# Author(s): Bill Addis,William Addis
# Publisher: Architectural Press; illustrated edition edition (August 20, 2001)
# Language: English
# ISBN-10: 0750642106
# ISBN-13: 978-0750642101
Paperback: 144 pages
Review
"This book illustrates why so many students select engineering as a profession and as well as inspiring new engineers it should encourage new students and existing professionals to be inspired... This book is very well illustrated... This is a very good book to inspire clients and architects on how to get the best from engineers."
Engineering World, Winter 2001
Product Description
Illustrating the many ways that structural engineers can bring their creativity and innovation to contribute to the design of the best buildings, this book presents the full value of the engineer in helping clients and architects achieve their goals.
The structural engineer's primary contribution to a project is clear - to ensure the building stands up and carries the loads to which it may be subjected. However, good engineers can bring so much more than this minimum. They add value to a project, enable it to function more effectively, reduce the risk of time and cost overruns, and enable architects greater opportunities for expression.
Addis presents a complete understanding of structure, by explaining the processes, variety of materials and philosophical issues involved, through over forty case studies. These examples illustrate why innovative engineers are now recognized as creators in their own right, able to explore the infinite ways of making and joining materials to create structure and form. It also proves their essential role as an integral member of the design team.
This text is useful to engineers in demonstrating how to apply a knowledge of materials and form to their clients needs, and useful for architects in knowing how to get the best from a structural engineer and realise their dreams.
* Provides a resource for architects in understanding and making effective use of materials and structures
* Encourages more architects to ask for more imaginative input from their structural engineers to inspire building designs
* International case-studies reveal ways in which engineers can help develop architects' ideas
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The link is for a torrent. The file from download is about 800 MB. I used Vuze for downloading (a very good client based on Azureus).
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IMPORTANT NOTICE: You may use this software for evaluation purposes only.
If you like it, it is strongly suggested you buy it to support the developers.
By any means you may not use this software to make money or use it for commercial purpose.
Just recently, I was being called by an employer informing me that my qualifications fit for their job requirements. I was invited to appear for an interview on Monday next week. This company is one of the reputed company in Saudi Arabia and they are looking for Civil Design Engineers. I just wanted to ask you guys if you have some tips, some advice, the Do's and Dont's on a job interview.
Of course, I do have already my experience but I wanted to know the opinions of other great engineers in this forum.
Author: Alan Williams | Edition: Fifth | Format:PDF | Publisher: Professional Publications, Inc. | Year: October 21, 2010 | pages: 348 | ISBN: 1591263352, 978-1591263357
The Structural Engineering Reference Manual is the most comprehensive reference and study guide available for engineers preparing for the NCEES 16-hour Structural PE exam. Nearly 40 practice problems with step-by-step solutions help you sharpen your problem solving skills, while demonstrating how to arrive at solutions most efficiently. Numerous charts, tables, and figures make it possible to work most exam problems using the reference manual alone. Quickly locate the important information you need to solve problems using the comprehensive index.
Because the Structural PE exam requires a thorough familiarity with relevant codes, the Structural Engineering Reference Manual, 5th Edition, is updated to the following:
* 2004 edition of PCI
* 2005 edition of ASCE 7
* 2005 edition of NDS
* 2005 editions of ACI 318 and ACI 530/530.1
* 2005 edition of AISC, Steel Construction Manual
* 2006 edition of IBC
* 2007 edition of AASHTO
“The European Guidelines for Self Compacting Concrete” represent a state of the art document addressed to those specifiers, designers, purchasers , producers and users who wish to enhance their expertise and use of SCC.
The Guidelines have been prepared using the wide range of the experience and knowledge available to the European Project Group. The proposed specifications and related test methods for ready-mixed and site mixed concrete, are presented in a pre-normative format, intend to facilitate standardisation at European level. This approach should encourage increased acceptance and utilisation of SCC.
“The European Guidelines for Self Compacting Concrete” define SCC and many of the technical terms used to describe its properties and use. They also provide information on standards related to testing and to associated constituent materials used in the production of SCC.
Durability and other engineering properties of hardened concrete are covered to provide reassurance to designers on compliance of SCC with EN 1992-1-1 Design of concrete structures (Eurocode 2).
The Guidelines cover information that is common to SCC for the ready-mixed, site mixed and the precast concrete industry. Chapter 12 is devoted to the specific requirements of precast concrete products.
The document describes the properties of SCC in its fresh and hardened state, and gives advice to the purchaser of ready-mixed and site mixed concrete on how SCC should be specified in relation to the current European standard for structural concrete, EN 206-1. It also describes the test methods used to support this specification. The appended specification and test methods are presented in a pre-normative format that mirrors current EN concrete standards.
Advice is given to the producer on constituent materials, their control and interaction. Because there are a number of different approaches to the design of SCC mixes, no specific method is recommended, but a comprehensive list of papers describing different methods of mix design is provided.
Advice is given to the contractor/user of ready-mixed and site mixed concrete on delivery and placing. Whilst accepting that SCC is a product used by both the precast and in-situ industries, the Guidelines attempt to give specific advice related to the differing requirements of the two sectors. For example, early setting and early strength are important to precasters, whereas workability retention may be more important in in-situ applications.
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Posted by: datagap - 01-21-2011, 12:24 AM - Forum: Concrete
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Casting of Self Compacting Concrete
Author: Edited by Å. Skarendahl and Peter Billberg | Size: 1.5 MB | Format:PDF | Publisher: RILEM Publications S.A.R.L. | Year: 2006 | pages: 41 | ISBN: 235158001X; 2912143985
Increased productivity and improved working environment have had high priority in the development of concrete construction over the last decade. Development of a material not needing vibration for compaction - i.e. self-compacting concrete, SCC – has successfully met the challenge and is now increasingly being used in routine practice.
The key to the improvement of fresh concrete performance has been nanoscale tailoring of molecules for surface active admixtures, as well as improved understanding of particle packing and of the role of mineral surfaces in cementitious matrixes. Fundamental studies of rheological behaviour of cementitious particle suspensions were soon expanded to extensive innovation programs incorporating applied research, site experiments, instrumented full scale applications, supporting technology, standards and guides, information efforts as well as training programs.
The major impact of the introduction of self-compacting concrete is connected to the production process. The choice and handling of constituents are modified as well as mix design, batching, mixing and transporting. The productivity is drastically improved through elimination of vibration compaction and process reorganisation. The working environment is significantly enhanced through avoidance of vibration induced damages, reduced noise and improved safety. Additionally, the technology is improving performance in terms of hardened material properties like surface quality, strength and durability.
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