Internal Curing: a 2010 State-Of-the-Art Review

Internal Curing: a 2010 State-Of-the-Art Review
Author: nist
Publisher:
Total Pages: 96
Release: 2013-11-26
Genre:
ISBN: 9781494290443

The American Concrete Institute in 2010 defined internal curing as supplying water throughout a freshly placed cementitious mixture using reservoirs, via pre-wetted lightweight aggregates, that readily release water as needed for hydration or to replace moisture lost through evaporation or self-desiccation (American Concrete Institute, 2010). While internal curing has been inadvertently included in many lightweight concretes produced within the past 100 years, it is only within the first decade of the 21st century that this technology has been intentionally incorporated into concrete mixtures at the proportioning stage, using a variety of materials including pre-wetted lightweight aggregates, pre-wetted crushed returned concrete fines, superabsorbent polymers, and pre-wetted wood fibers. This report provides a state-of-the-art review of the subject of internal curing, first addressing its history and theory, andthen proceeding to summarize published guidance on implementing internal curing in practice and published research on its influence on the performance properties of concrete. The ongoing exploration of extensions of the internal curing concept that employ the internal reservoirs to contain materials other than water are reviewed. Finally, the critical issue of sustainability is addressed. An extensive internal curing bibliography that is also available over the Internet is included in an appendix. The report is mainly focused on the utilization of prewettedlightweight aggregates as the internal reservoirs due to thisbeing the current established practice within the U.S.

Aluminum Alloys for Transportation, Packaging, Aerospace, and Other Applications

Aluminum Alloys for Transportation, Packaging, Aerospace, and Other Applications
Author: Subodh K. Das
Publisher: Wiley-TMS
Total Pages: 0
Release: 2007-05-01
Genre: Technology & Engineering
ISBN: 9780873396622

The focus of this book is the study of the physical and mechanicalmetallurgy of aluminum alloys produced by processing methods. Itaddresses progress in research, development, testing andapplication of aluminum sheet, plate, extrusions, forgings, andother products in end uses. Those applications includetransportation, such as automotive, aerospace and marine, packagingand other key areas. A collection of papers from the ahref="http://www.tms.org/Meetings/Annual-07/AnnMtg07Home.html"target="_blank"2007 TMS Annual Meeting & Exhibition/a heldin Orlando, Florida, February 25 -- March 1, 2007.

Structural Use of Concrete

Structural Use of Concrete
Author: British Standards Institution
Publisher:
Total Pages: 163
Release: 1997
Genre: Concrete
ISBN: 9780580262081

Concretes, Construction materials, Buildings, Structures, Structural design, Loading, Reinforced concrete, Strength of materials, Framed structures, Beams, Slabs, Structural members, Shear stress, Columns, Walls, Stability, Stairs, Foundations, Reinforcement, Prestressed concrete, Precast concrete, Composite construction, Composition, Durability, Concrete mixes, Curing (concrete), Formwork, Finishes, Movement joints, Grouting

Anchorage zone design

Anchorage zone design
Author: Gregor P. Wollmann
Publisher:
Total Pages: 46
Release: 2000
Genre: Anchorage (Structural engineering)
ISBN: 9781931085014

Provides guidance on comprehensive treatment of tendon anchorage zone requirements and analysis methods. Special emphasis on practical applications of strut and tie design approach, which is recommended by AASHTO and ACI. Step by step design analyses for a number of typical anchorage zone conditions.

Construction Handbook for Bridge Temporary Works

Construction Handbook for Bridge Temporary Works
Author: American Association of State Highway and Transportation Officials
Publisher: American Association of State Highway & Transportation Officials
Total Pages: 0
Release: 1995
Genre: Technology & Engineering
ISBN: 9781560510352

Experimental Evaluation of Full Depth Precast/prestressed Concrete Bridge Deck Panels

Experimental Evaluation of Full Depth Precast/prestressed Concrete Bridge Deck Panels
Author: Mohsen A. Issa
Publisher:
Total Pages: 278
Release: 2002
Genre: Concrete bridges
ISBN:

A literature review concerning the objectives of the project was completed. A significant number of published papers, reports, etc., were examined to determine the effectiveness of full depth precast panels for bridge deck replacement. A detailed description of the experimental methodology was developed which includes design and fabrication of the panels and assembly of the bridge. The design and construction process was carried out in cooperation with the project Technical Review Panel. The major components of the bridge deck system were investigated. This includes the transverse joints and the different materials within the joint as well as composite action. The materials investigated within the joint were polymer concrete, non-shrink grout, and set-45 for the transverse joint. The transverse joints were subjected to direct shear tests, direct tension tests, and flexure tests. These tests exhibited the excellent behavior of the system in terms of strength and failure modes. Shear key tests were also conducted. The shear connection study focused on investigating the composite behavior of the system based on varying the number of shear studs within a respective pocket as well as varying the number of pockets within a respective panel. The results indicated that this shear connection is extremely efficient in rendering the system under full composite action. Finite element analysis was conducted to determine the behavior of the shear connection prior to initiation of the actual full scale tests. In addition, finite element analysis was also performed with respect to the transverse joint tests in an effort to determine the behavior of the joints prior to actual testing. The most significant phase of the project was testing a full-scale model. The bridge was assembled in accordance with the procedures developed as part of the study on full-depth precast panels and the results obtained through this research. The system proved its effectiveness in withstanding the applied loading that exceeded eight times the truck loading in addition to the maximum negative and positive moment application. Only hairline cracking was observed in the deck at the maximum applied load. Of most significance was the fact that full composite action was achieved between the precast panels and the steel supporting system, and the exceptional performance of the transverse joint between adjacent panels.