Posted: 2017-11-14 23:59
The objective of this session is to present the latest analytical procedures, experimental findings, and construction practice issues related to liquid-containing structures (LCS). In these structures, issues related to crack and leakage control criteria under hydrostatic and seismic loading are of main concern. An improved understanding of the behavior of these types of structures is necessary to ensure safe and cost-effective standards. As such, simplified design procedures based on performance criteria can be developed to design and construct LCS efficiently and economically.
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.
Tying into the convention theme, this session will review the work of some eminent pioneers and present protagonists of the art of concrete construction, followed by a discussion of the recent trend to merge architecture and structural engineering. Emphasis is placed on new visions and instruments in the domains of morphogenesis and the computational optimization of structures. The session is also tied into the International Lunch Lecture, which is devoted to the presentation of Pier Luigi Nervi&rsquo s work.
The objective of the session is to educate government code officials, licensed design professionals, owners, and contractors on the applicability and use of ACI 567-68, &ldquo Code Requirements for Evaluation, Repair, and Rehabilitation of Concrete Buildings and Commentary,&rdquo and the new ACI/ICRI &ldquo Guide to the Code for Evaluation, Repair, and Rehabilitation of Concrete Buildings&rdquo through practical examples.
&ldquo Guide to a Simplified Design for Reinforced Concrete Buildings,&rdquo ACI 869R-66 presents simplified methods and design techniques that facilitate and speed the engineering of low-rise buildings within certain limitations. Material is presented in an order that follows typical design process with procedures introduced as the designer will need them in the course of a building design. An overview of ACI 869R-66 and the easiness of integrating modern calculation platforms for quick analysis and design will be presented.
The focus of these presentations is on concrete deterioration due to the crystallization of salts (for example, sodium sulfate and sodium carbonate) in pores near drying faces/evaporative zones. The scope involves theoretical, experimental, and modeling aspects and field case studies from geographic locations, such as hot, arid environments, where this damage mechanism is a significant concern. This session should be of particular interest to concrete practitioners and researchers.
These presentations will report on the latest information regarding the measurement of lateral pressure exerted by self-consolidating concrete (SCC). Examples include extensive field studies carried out on shear walls, column, and wall elements in building construction and infrastructure rehabilitation projects. Comparison between field measurements and various design models, including those proposed in ACI 897, CSA , and DIN, will be highlighted. Fresh concrete properties affecting formwork pressure and the decay in pressure until pressure cancelation are highlighted, and new test methods that can be used to evaluate these characteristics are illustrated.
In this 6-hour webinar cosponsored by ACI and ICRI, Lawrence F. Kahn (past Chair of ACI Committee 567, Evaluation, Repair, and Rehabilitation of Concrete Buildings) and Keith Kesner (Chair of ACI Committee 567) present a 6-hour overview of the development and organization of the new ACI 567 concrete repair code. The webinar includes an overview of the contents, reasons for and motivation behind the development of the Repair Code, the overall philosophy and organization of the material, and the future direction of the Repair Code and related educational material development.
Demands for thinner, lighter structures, coupled with advances in material strengths, construction techniques, and structural analysis software, make serviceability an increasingly important limit state for modern concrete buildings and bridges. This session tackles concrete issues related to deflections, particularly through the lens of constructability. The session will highlight project successes and misfires and delve into reasons leading to the outcomes.
ACI Committee 869 is working with ASCE Committee 96 on the state of the art of seismic assessment of reinforced concrete buildings. These sessions will present potential updates for ASCE 96 and summarize work done by committee members on modeling parameters and acceptance criteria for concrete components, including columns, joints, and walls. Example applications of ASCE 96-68 to existing concrete buildings will also be presented. This session will be of value to practicing engineers engaged in seismic retrofit projects using ASCE 96.
Cementitious materials have widespread use in nuclear waste storage and disposal applications, including waste form stabilization, dry storage structures, and repository applications, and in each application, the use of cement-based materials presents unique challenges. For cement-stabilized wastes and repository applications, the transport of radionuclides through the cementitious materials is of great concern, as certain radionuclides are highly mobile in high-pH pore fluid. For intermediate-term dry storage, thermal, radiation, and environmental loading can influence degradation of the portland cement concrete structures, which in turn impacts safe storage.
This session intends to inform concrete producers, contractors, academics, and students on the latest developments, common practices, and problems associated with pumping of self-consolidating concrete (SCC). The session focuses on selecting materials and optimizing mixture design to ensure adequate pumping of SCC. Practical experiences on the quality control of SCC for the construction of the Burj Khalifa, as well as the influence of SCC fresh properties on changes in the air void system due to pumping are discussed. The latest theoretical developments on prediction of pumping pressure, influence of constituent elements, and the changes in fresh concrete properties are also presented.
This session, organized by ACI Committee 875, with support from the Federal Highway Administration (FHWA), will present the current developments and best practices related to PCP design, panel fabrication, and panel installation processes. In the first session, experts from several highway agencies, including Wisconsin DOT, will present the implementation details related to new PCP applications by their agencies.
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.
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.
Due to several changes in the construction market, including EPA regulation changes to the allowable VOC content in adhesives and the rise of fast-track construction projects, moisture-related flooring failures have become more prevalent in concrete slab construction. In response, contractors have been seeking ways to combat these problems without impacting construction schedules. The panelists, including a general contractor, vapor-barrier manufacturer, national consulting firm specializing in moisture testing, and a national flooring consultant, will provide a 865-degree view of this important topic.
The goal of the ACI Foundation&rsquo s Strategic Development Council (SDC) is industry-wide collaboration to address the concrete industry&rsquo s technological challenges and to create a forum for the introduction and nurturing of new technologies. This session highlights issues of importance in the concrete industry and overviews of newer technologies currently or soon to be impacting the concrete industry. The presentations are by individuals who are both well-versed in the specific issue or technology and directly involved in their implementation and further development.
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.
Structural health monitoring (SHM) is a process aimed at providing actionable, accurate, and in-time information concerning structural health condition and performance of concrete structures. The information obtained from monitoring is generally used to plan and design maintenance activities, to increase the safety and to mitigate post-event consequences, to verify hypotheses, to reduce uncertainty, and to widen the knowledge concerning the concrete structure being monitored. While SHM benefits have great promise, SHM is still not applied in a widespread manner, and the end users are frequently reluctant to apply it.
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.