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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 24 Abstracts search results
Document:
92-S24
Date:
March 1, 1995
Author(s):
ACI Committee 224
Publication:
Structural Journal
Volume:
92
Issue:
2
Abstract:
This report reviews the state of the art in design, construction, and mainte-nance of joints in concrete structures subjected to a wide variety of use and environmental conditions. In some cases, the option of eliminating joints is considered. Aspects of various joint sealant materials and jointing techniques are discussed. The reader is referred to ACI 504R for a more comprehensive treatment of sealant materials, and to ACI 224R for a broad discussion of the causes and control of cracking in concrete construction. Chapters in the report focus on various types of structures and structural elements with unique characteristics: buildings, bridges slabs on grade, tunnel linings, canal linings, precast concrete pipe, liquid-retaining structures, walls, and mass concrete.
DOI:
10.14359/9656
85-S51
September 1, 1988
ACI Committee 347
85
5
Objectives of safety, quality, and economy are given priority in these guidelines for formwork. A section on contract documents explains the kind and amount of specification guidance the engineer/architect should provide for the contractor. The remainder of the report advises the contractor on the best ways to meet the specification requirements safely and economically. Separate chapters deal with design, construction, and materials for formwork. Considerations peculiar to architectural concrete are also outlined in a separate chapter. Other sections are devoted to formwork for bridges, shells, mass concrete, and underground work. The concluding chapter on formwork for special methods of construction includes slipforming, preplaced aggregate concrete, tremie concrete, precast, and prestressed concrete
10.14359/3140
JL74-38
September 1, 1977
Journal Proceedings
74
9
Presents formwork standards and guidelines based on safety, quality, and economy and recognizing that 35 to 60 percent of the total cost of the concrete work in a project in the United States may be in the formwork. A section is devoted to contract plans and specifications noting the kind and amount of specification the engineer/architect should provide the contractor. Since the committee concludes that formwork design as well as construction must be the responsibility of the contractor, the recommendations contained in the standard are directed to that group. This standard, then, presents recommended practices for formwork and suggests criteria for assuring proper performance. Engineers and architects must note that this standard, ACI 347, is not written in specification language and should not be used as a reference specification. However, an understanding of these recommendations by engineers and architects will greatly aid these groups in the preparation of their specifications. The report is divided into six chapters: (I) introduction; (2) design; (3) construction; (4) materials for formwork; (5) f orms for special structures; and (6) formwork for special methods of construction.
10.14359/11020
JL70-02
January 1, 1973
George C. Hoff and B. J. Houston
70
1
Nonmetallic waterstops having suitable roperties for use in joints in hydraulic structures concrete have been made successfully from natural rubber synthetic rubber, and polyvinyl chloride. To perform satisfactorily, a waterstop must have sufficient strength and extensibility to avoid being ruptured by joint movement, and it must maintain strength and extensibility over the temperature range and in spite of any chemical attack from the environment. It must also have suitable dimensions and configuration and be installed so as to avoid water flow around the embedded ends. Field and laboratory studies have led to the establishment of various minimum proper requirements. Suitable waterstop materials should have a tensile strength of at least 1400 psi (plastic) or 2000 psi (rubber), the ability to elongate 280 percent (plastic) or 360 ercent (rubber), and be able to maintain certain evels of other relevant properties P after various chemical and thermal exposure.
10.14359/11180
JL70-03
Henry Johns
Reviews U. S. Bureau of Reclamation experience with sealing joints and cracks in concrete-lined canals. After several decades experience, two basic systems for sealing contraction joints, and two for sealing cracks have resulted. For crack sealing, seals formed of either a coal tar extended polfide rubber sealant or a glass cloth reinforced phalt mastic tape are used. For joint sealing, PVC plastic contraction-joint-forming waterstop inserted into fresh concrete or coal tar extended polysulfide sealant are used. The polysulfide may be machine extruded into fresh or hardened concrete or installed as a preformed strip in fresh concrete. The two joint sealing systems seem to be competitive in cost and at a price only somewhat higher than the old asphalt mastic which afforded only half the service life. The long-term cost for sealing with the new systems thus appears to have been reduced by at least 50 percent.
10.14359/11181
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