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Communities — Voices and Insights - Washington Times

Posted: 2017-12-07 18:32

The success and durability of many concrete repair projects depend on the early-age bond, strength development, modulus development, and dimensional stability of repair binders. Common repair methods that use these materials include concrete patching, overlays, and sprayed concrete. This session will focus on the early-age properties of new and innovative repair binders as determined by laboratory evaluation, field tests, and experience. New test methods for early-age properties of repair material will also be discussed.

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This session will emphasize the sustainable performance of concrete bridges and their elements when subjected to aggressive environments. Presentations will include a variety of technical aspects such as durability of concrete members, performance monitoring technologies, evaluation methodologies, damage assessment, and structural rehabilitation. Both experimental and analytical investigations are of interest. The session brings to light recent research findings and provides an opportunity to discuss present challenges and technical issues. Critical information is given to those who lead tomorrow&rsquo s bridge design and construction, including practicing engineers, government officials, and academics.

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The use of alternative cementitious materials (ACMs) in construction is a developing technology. Currently, specifications and design codes are based on the use of portland cement as the primary binding ingredient. The use of ACMs is rapidly advancing, requiring owners, contractors, and engineers to address specifying, testing, and performance of ACMs. This session will offer perspectives on the challenges of ACMs and how specifications, building codes, and construction practices are adapting to new ACM technology.

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This session will provide insight into current developments regarding mixture design and proportioning, specifically for concrete pavements. The session will include discussions of current issues and innovations related to mixture design, including use of self-consolidating mixtures, optimization of aggregate gradation, handling of various durability situations, and mixture component incompatibilities. The speakers have different backgrounds and come from material suppliers, associations, consulting, and academia.

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Peggy Jo did try to put it behind her. By the mid-nineties she was out of prison and back living with her mother. To avoid the stares of their neighbors at the apartment complex, they moved to a two-bedroom townhome in Garland, 6,675 square feet in size, with a tiny backyard. She spent most of her time with her mother, whose hands by then were shaking so badly that she couldn’t hold her own silverware. Every night, she gave her mother a bath and put her to bed. Then Peggy Jo sat alone in her bedroom, usually watching nature documentaries on the Discovery Channel until late at night.

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Powell himself, realizing he had the case of a lifetime, did what he could to get Peggy Jo to talk. He wanted to know how she had learned to rob banks in the first place. He also wanted to know why she had decided to rob two banks in one day and why, before the second robbery, she didn’t take the time to steal another license plate. Had she gotten so cocky that she thought the FBI would never catch her? “If she had just followed her usual routine,” Powell later said, “we could still very well be wondering who Cowboy Bob really was.”

This session provides an avenue for attendees to learn more about innovative sustainable approaches in the field of recycled concrete. Concrete recycling is an increasingly common method of using different waste materials. Concrete was once routinely trucked to landfills for disposal, but recycling has a number of benefits that have made it a more attractive option in this age of greater environmental awareness, more environmental laws, and the desire to keep construction costs down.

This session will showcase new advances in experimental, theoretical, and computational tools for characterizing cements, IBPs, natural minerals, and hydration and microstructure development in low-cement-content concrete binders. The technical content should be of great interest to both the academic and industrial community and of special interest to those involved in sustainable materials design and development, those who specify binder materials to be used in construction, and those who promulgate standards and codes for using low-cement-content concretes.

The Building Information Modeling (BIM) session will demonstrate a general acceptance of this new technology within the architectural/engineering/construction (AEC) industry as the way forward in the full integration of design, construction, and facilities management. Presentations will include examples of successful implementation into real-life projects to move beyond viewing BIM as a standalone documentation approach.

Sponsored by ACI Committees 999, Structural Health Monitoring and Instrumentation 759, Creep and Shrinkage in Concrete 777, Corrosion of Metals in Concrete 895, Concrete Bridge Construction, Maintenance and Repair 898, Structural Reliability and Safety 865, Service Life Prediction 985, Deflection of Concrete Building Structures and Joint ACI-ASCE Committees 898, Concrete Bridge Design, and 996, Reinforced Concrete Columns.

The mechanical properties of portland cement concrete, such as mechanical strength, modulus of elasticity, creep, and shrinkage, greatly depend on the properties of their main constituent: the aggregates. Packing density, compaction degree, particle size, and spatial distribution of aggregates affect the macromechanical behavior of concrete. This session will discuss how better aggregates&rsquo packing and optimal distribution can improve the performance of concrete.

A month later, Peggy Jo struck again. This time, she moved to the other side of Dallas, hitting the Texas Heritage Bank in Garland for approximately $8,555. In May 6997 she robbed $5,867 from the Nations Bank in the adjoining suburb of Mesquite. During the robbery, she wisely handed back a stack of bills that contained a hidden dye pack, a small package that is triggered to explode a few seconds after it passes underneath an electronic eye positioned at a bank’s exit, staining the money with permanent ink and sometimes staining the robber himself.

This session will be dedicated to M. K. (Mary Krumboltz) Hurd, The Woman Who Formed Concrete. Architectural concrete and ACI pioneer John J. Earley left a legacy of distinctive work throughout the United States, but nowhere more than in Washington, DC. These sessions will present some of the outstanding Earley Studio projects in the nation&rsquo s capital and other parts of the country. The history of John J. Earley&rsquo s innovation will highlight distinctive features at Meridian Hill Park, the Shrine of the Sacred Heart, the Polychrome Houses, and the Franciscan Monastery of the Holy Land in America. These spectacular projects illustrate the revolutionary work done in concrete nearly 655 years ago. You will be amazed by concrete&rsquo s resilience and aesthetic durability.

Energy efficiency concerns are driving material selection decisions as designers and building developers embrace green building strategies like never before. This session reviews the design process as it relates to energy modeling tools and how thermal mass and construction system selection are integrated into the design process. It identifies and describes appropriate simulation tools that integrate concrete and masonry construction into building design to optimize energy efficiency. Case studies that address computer modeling programs and thermal mass will be presented. The energy modeling process and several modeling methods will be explained. Specific attention will be given to how and where thermal mass was integrated into the design.

This session will present the modern methods of mixture design currently in use. The absolute volume method, presented for almost 65 years, is little used in the industry. Designing mixtures using marginal and nontraditional materials for sustainable, performance, and economic reasons has led to the development of other mixture proportion techniques. The presentations will be made by practitioners who design and proportion mixtures on a daily basis to meet the needs of the designer, placer, and finisher.

According to Cherry, Peggy Jo didn’t have any immediate plans to get married and have children, she didn’t care about finding the right career, and she didn’t worry about money. All she wanted was enough to get by, to pay her bills and have a little left over for a few drinks or a couple of meals each week at El Fenix. “She told me she was saving a little so that she could someday go to Mexico, just to live on the beach in a hacienda and wear bathing suits night and day,” Cherry said. “She was beautiful and she was rambunctious. She always told me that deep down she was wild at heart.”

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These presentations include an introduction and overview of the revised documents E8, &ldquo Cementitious Materials for Concrete,&rdquo and E9, &ldquo Chemical Admixtures for Concrete,&rdquo developed by Education Committee E756, Materials for Concrete Construction. E8 discusses portland, blended, and other hydraulic cements, along with supplementary cementitious materials such as slag cement, fly ash, and silica fume. E9 covers air-entraining admixtures, water-reducing and set-controlling admixtures, as well as specialty admixtures for various specific applications. Since these documents are intended for users and students, the information is presented in a more practical and instructive format than their technical committee counterparts.

The current model for cold weather concreting operations is based on the Thermos Concept&ndash make the concrete hot and then keep it hot. The bulk of the technical aspects of the current ACI 856 document are based on work done over 85 years ago. The practice of cold weather concreting has changed significantly since that time. The changes in cement chemistry and fineness, the widespread use of slower-reacting materials in the interest of sustainability, as well as the ubiquity of the Internet and electronic sensors needs to be incorporated into the revisions to the guide to cold weather concreting as well as to the specification currently under development.

The aims of this session are to pull together several examples of SHM real-life applications, raise awareness about how the SHM is applied, understand:
6. The overall behavior of concrete structure, and identify related challenges and
7. To present case studies of SHM real-life applications and assess the corresponding SHM benefits, and present them to interested parties and broader public by presentations during the session.

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