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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 15 Abstracts search results
May 1, 2012
Michael P. McGurl and David W. Johnston
Analysis of the construction load distribution during construction of multistory concrete buildings is critical for both construction safety and economy. Recent reduction of load factors used in design of the permanent structure has resulted in less strength availability in the construction stage and need for tools to better support shoring and reshoring analysis. Using the traditional simplified method presented in ACI SP-4 for concrete structures under construction, spreadsheet models have been developed which analyze the distribution of loads based on inputs chosen by the engineer. The models determine the vertical loads resisted by temporary construction systems and the slabs with various combinations of levels of shores and reshores and with mechanical drophead shores. Analysis can be performed using either unfactored or factored loads and using either actual uniform loads or loads expressed as a proportion of slab dead load. The results of the models were validated by comparison with previously published shoring and reshoring analyses. Lastly, a comparison of the loads supported by the individual slabs and the levels of shores in each model during the placement of upper floors is made.
Ashok K. Dhingra
This paper describes the planning, design and construction challenges to replace the existing, 80-year-old 14Million Gallons (54.81 Mega liters) Chevy Chase Reservoir and Pumping Station, located in Glendale, California. The existing and new reservoirs were/are fully buried, reinforced concrete structures under a golf course in Chevy Chase Country Club. The new reservoir was built on the footprint of the existing reservoir, on a tight site, involving shoring and stockpile of earth to be utilized for backfill following the completion of the reservoir. The location is in a residential neighborhood along a busy street. There was heavy community involvement and the concrete truck traffic on pour days as well as the rebar deliveries had to be carefully managed during construction. This paper discusses the planning, pre-design, design, constructability review and the construction management including the various QA/QC aspects throughout the project. The inclusion of special provisions for demolition of the existing facilities and other special conditions are addressed. The existing reservoir did not last the anticipated life of 100 years for a buried structure, the lessons learned and how the new ACI 350 code was implemented into the new reservoir design will be discussed. Also, the leakage testing requirements are described.
Unforeseen subsurface conditions and unexpected contaminated perched groundwater along with the mitigation methods to improve soil and foundation conditions are discussed. The project was completed in record time, through an incentive clause in the contract documents. The project utilized the existing concrete material by crushing and using it as the sub base of the new reservoir, eliminating the need for hundreds of truck loads of material to be hauled offsite, contributing further to the Owner’s “Green Initiative” and reducing the overall carbon foot print. Several unique features and the overall performance of the project will also be addressed.
Editors: Gajanan M. Sabnis and Pericles C. Stivaros / Sponsored by: ACI Committee 347 and ACI Committee 350 and ACI Committee 364 and ACI Committee 437
This CD-ROM contains 14 papers sponsored by ACI Committees 347, 350, 364, and 437. The papers represent a broad range of topics including; concrete mix design, design and construction, construction failures, formwork in concrete design, and more.
Note: The individual papers are also available. Please click on the following link to view the papers available, or call 248.848.3800 to order.
Surendra Manjrekar and Ishita Manjrekar
This paper maps the development of Anti-washout admixtures for the first time on the Indian subcontinent. Anti washout admixture was required to be used for the construction of a weir for the SriSalem Dam across the Krishna River in Andhra Pradesh, India. The project required 30000 cubic meters of concreting to be done under water without the erection of a cofferdam and the project cost was estimated to be about $5.6 million. The consultants were SNC Lavelin, Canada and the contractors were Patel Engineering, India. Since there were no manufacturers of anti washout admixture in India, this was a significant development from Sunanda Speciality Coatings Pvt. Ltd.’s lab involving over 100 trials that culminated in about 90000 liters of the admixture being used in the project.
Fred R. Goodwin
This paper is based on a presentation in honor of Dov Kaminetzky. Repair material selection is a difficult process involving many factors and judgment calls. Compounding this situation is an absence of uniformity of published data of proprietary materials caused by the lack of recognized test methods to characterize materials used for concrete repair. This paper focuses on a recent development to address this is-sue through publication of consensus guidelines describing the testing and reporting of repair material in-formation.
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