ACI SP-325-2018 Mass Concrete and Thermal Cracking a Joint ACI-JCI Seminar.pdf
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1、An ACI Technical Publication SYMPOSIUM VOLUMESP-325Mass Concrete and Thermal Cracking, a Joint ACI-JCI SeminarEditors:Melissa Harrison and Christopher C. FerraroMass Concrete and Thermal Cracking, a Joint ACI-JCI SeminarSP-325Editors:Melissa Harrison and Christopher C. FerraroDiscussion is welcomed
2、for all materials published in this issue and will appear ten months from this journals date if the discussion is received within four months of the papers print publication. Discussion of material received after specified dates will be considered individually for publication or private response. AC
3、I Standards published in ACI Journals for public comment have discussion due dates printed with the Standard.The Institute is not responsible for the statements or opinions expressed in its publications. Institute publications are not able to, nor intended to, supplant individual training, responsib
4、ility, or judgment of the user, or the supplier, of the information presented.The papers in this volume have been reviewed under Institute publication procedures by individuals expert in the subject areas of the papers.Copyright 2018AMERICAN CONCRETE INSTITUTE38800 Country Club Dr.Farmington Hills,
5、Michigan 48331All rights reserved, including rights of reproduction and use in any form or by any means, including the making of copies by any photo process, or by any electronic or mechanical device, printed or written or oral, or recording for sound or visual reproduction or for use in any knowled
6、ge or retrieval system or device, unless permission in writing is obtained from the copyright proprietors.Printed in the United States of AmericaEditorial production: Ryan JayISBN-13: 978-1-64195-020-6First printing, July 2018PrefaceThermal cracking and damage from high internal temperatures during
7、construction are concerns for the mass concrete of dams, bridges, buildings, and power plants. The design, planning and execution of placements which involve mass and thermally controlled concrete must consider hydration of cementitious materials within the concrete mixture to avoid thermal-related
8、distress. Without such considerations, durability, and in some cases, structural integrity can be affected. This Special Publication is intended to help owners, designers, contractors, and concrete suppliers understand and address concerns with mass and thermally controlled concrete.To highlight sta
9、te-of-the-art developments in defining, designing, testing and modeling mass and thermally controlled concrete, American Concrete Institute (ACI) Committee 207 and the Japan Concrete Institute (JCI) held a full-day technical session at the ACI Fall Convention, Cincinnati, Ohio, October 16-20, 2011.
10、This Special Publication (SP) contains eight of the papers presented at the technical session. The subjects of these papers include: (1) defining mass and thermally controlled concrete (2) design and planning considerations for mass concrete; (3) modeling and prediction of in-place concrete temperat
11、ure development, and (4) physical testing of mass concrete. On behalf of ACI Committee 207 and JCI, the editors sincerely thank all authors and presenters for their efforts and contributions to the technical session and this SP volume. Special thanks are given to the reviewers of the original manusc
12、ripts for their constructive comments and suggestions. The editors are also indebted to the ACI staff for their assistance in organizing this session and in preparing this SP. The editors earnestly hope that the information presented at the ACI session and in this SP will facilitate significant impr
13、ovements in defining mass concrete, as well as the design, planning and control of mass concrete. This SP will serve as a valuable resource for researchers and engineers to make such improvements. Editors:Melissa Harrison SCB International, USA Christopher C. Ferraro University of Florida, USATABLE
14、OF CONTENTSSP-3251Planning and Execution of a Mass Concrete Placement Utilizing Insulation RegimenAuthor: Ufuk DilekSP-3252Shear Testing of RCC and Other Concrete BlocksAuthors: Stephen B. Tatro and James K. HindsSP-3253Temperature Predictions of a Ternary Mix Design for Mass Concrete PlacementsAuth
15、ors: Joseph W. Clendenen and Benn B StutrudSP-3254Design Considerations for Raising the Hinze Dam Mass Concrete SpillwayAuthors: Scott Jones, David Hughes, and Orville R. Werner IISP-3255Estimating Maximum Temperature Difference in Mass ConcreteAuthors: Ronald Kozikowski and Bruce SuprenantSP-3256Eq
16、uivalent Age and Physical Properties of Mass Concrete Authors: Christopher C. Ferraro, Mang Tia, and Adrian M. LawrenceSP-3257Proposed Mass Concrete Definition Based on Concrete Constituents and Minimum DimensionAuthors: John Gajda, Jon Feld and Christopher C. FerraroSP-3258Planning and Execution of
17、 a Large Mass Concrete Placement with Different Insulation LevelsAuthors: Boris Haranki, Harini Santhanam, and Ufuk DilekSP-3251 1.1 Planning and Execution of a Mass Concrete Placement utilizing Insulation Regimen Ufuk Dilek Ph.D. , P.E. Concrete Subject Matter Expert The Shaw Group 128 S. Tryon Str
18、eet Suite 600 Charlotte, NC 28202 Tel: 1 (704) 343 46 26 E-Mail: Abstract This paper summarizes the planning and execution stages of a critical mass concrete placement performed during summer months. The subject structure was a critical component of a large heavy industrial facility, consisting of
19、large load bearing elevated flexural members. The planning and execution of this critical mass placement consisted of multiple tasks. A laboratory study was performed for the purpose of making improvements to the mixture proportions existing and currently in use, admixture dosages and investigating
20、placement temperature options. Adiabatic and semi adiabatic temperature rise was also measured during the laboratory study along with set times. Final proportions and admixture dosages were selected as a result of the laboratory phase. Primary outcome was increase in fly ash percentage from the exis
21、ting mix design to control heat of hydration. Based on the findings of the measured adiabatic temperature rise, a thermal control plan was developed adapting the new approach to structural mass concrete placements. A thermal protection/insulation regimen was developed using the mix parameters, expec
22、ted ambient temperatures following placement, member dimensions and formwork/blanket insulation properties. The pre-placement modifications to the mixture proportions and the delivery temperature requirements protected the concrete against high internal temperatures and potential of Delayed Ettringi
23、te Formation (DEF), while the insulation regimen protected the concrete against rapid cooling and occurrence of thermal gradients between core and perimeter. As part of the thermal control plan analysis, target placement temperatures were recommended to control maximum temperatures to prevent occurr
24、ence of DEF, in light of the heat rise of the modified mix. The placement temperature was accomplished by starting the placement at night and the use of ice to draw the temperature down. Upon completion of finishing, a curing compound was applied in lieu of water curing and the placement was insulat
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