Transfer and Development Length of High Strength Lightweight Concrete Precast Prestressed Bridge Girders - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Transfer and Development Length of High Strength Lightweight Concrete Precast Prestressed Bridge Girders write by . This book was released on 2002. Transfer and Development Length of High Strength Lightweight Concrete Precast Prestressed Bridge Girders available in PDF, EPUB and Kindle. This report presents the findings of a study that developed and tested high- strength lightweight concrete (HSLC) mixes having strengths from 8,000 psi to 12,000 psi made using slate lightweight aggregate. Based on optimized mix designs, 6 pretensioned AASHTO Type II girders were constructed using 8,000 psi and 10,000 psi slate HSLC and were prestressed using 0.6-inch diameter LOLAX strands tensioned to 75% of strand ultimate stress. The strands received no special preparation prior to girder casting. After initial curing for approximately 24 hours, transfer length measurements were taken from time of release until the beams reached an age of 14 days. The current AASHTO and ACI code provisions conservatively predicted transfer length for slate HSLC; modification of the current code specifications for transfer length was not necessary for slate HSLC. A direct pullout test was performed on both concrete design strengths to determine the bond between the slate lightweight concrete and the prestressing strand. A somewhat lower bond stress developed between the prestressing strand and the lightweight concrete when compared to similar strengths of normal-weight concrete. However, the average pullout strength for both series exceeded the minimum required value for 0.6-inch diameter strand of 43.2 kips. Tests were conducted on each girder end to determine development length characteristics.
High-performance/high-strength Lightweight Concrete for Bridge Girders and Decks
High-performance/high-strength Lightweight Concrete for Bridge Girders and Decks - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook High-performance/high-strength Lightweight Concrete for Bridge Girders and Decks write by Thomas E. Cousins. This book was released on 2013. High-performance/high-strength Lightweight Concrete for Bridge Girders and Decks available in PDF, EPUB and Kindle. "TRB's National Cooperative Highway Research Program (NCHRP) Report 733: High-Performance/High-Strength Lightweight Concrete for Bridge Girders and Decks presents proposed changes to the American Association of State Highway and Transportation Officials' Load and Resistance Factor Design (LRFD) bridge design and construction specifications to address the use of lightweight concrete in bridge girders and decks. The proposed specifications are designed to help highway agencies evaluate between comparable designs of lightweight and normal weight concrete bridge elements so that an agency's ultimate selection will yield the greatest economic benefit. The attachments contained in the research agency's final report provide elaborations and detail on several aspects of the research. Attachments A and B provide proposed changes to AASHTO LRFD bridge design and bridge construction specifications, respectively; these are included in the print and PDF version of the report. Attachments C through R are available for download below. Attachments C, D, and E contain a detailed literature review, survey results, and a literature summary and the approved work plan, respectively. Attachment C; Attachment D ; Attachment E; Attachments F through M provide details of the experimental program that were not able to be included in the body of this report. Attachment F; Attachment G; Attachment H; Attachment I; Attachment J; Attachment K; Attachment L; Attachment M. Attachments N through Q present design examples of bridges containing lightweight concrete and details of the parametric study. Attachment N; Attachment O; Attachment P; Attachment Q. Attachment R is a detailed reference list."--Publication information.
Extending Span Ranges of Precast Prestressed Concrete Girders
Extending Span Ranges of Precast Prestressed Concrete Girders - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Extending Span Ranges of Precast Prestressed Concrete Girders write by Reid Wilson Castrodale. This book was released on 2004. Extending Span Ranges of Precast Prestressed Concrete Girders available in PDF, EPUB and Kindle. At head of title: National Cooperative Highway Research Program.
Investigation of Transfer Length, Development Length, Flexural Strength and Prestress Loss Trend in Fully Bonded High Strength Lightweight Prestressed Girders
Investigation of Transfer Length, Development Length, Flexural Strength and Prestress Loss Trend in Fully Bonded High Strength Lightweight Prestressed Girders - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Investigation of Transfer Length, Development Length, Flexural Strength and Prestress Loss Trend in Fully Bonded High Strength Lightweight Prestressed Girders write by . This book was released on 2002. Investigation of Transfer Length, Development Length, Flexural Strength and Prestress Loss Trend in Fully Bonded High Strength Lightweight Prestressed Girders available in PDF, EPUB and Kindle. Cousins Encouraged by the performance of high performance normal weight composite girders, Virginia Department of Transportation has sought to exploit the use of high strength lightweight composite concrete (HSLWC) girders to achieve economies brought about by the reduction of dead loads in bridges. Transfer Length measurements conducted on two AASHTO Type IV HSLWC prestressed girders, resulted in an average transfer length of 17 inches, well below the AASHTO and ACI guidance. Two girders composed of HSLWC AASHTO Type II girders and a 48" x 8" normal weight 4000-psi concrete deck were produced. The HSLWC Type II girders were cast of concretes with a compressive strength of 6380 psi and unit weight of 114 pcf. Full scale testing of the girders was conducted to evaluate development length and flexural strength in HSLWC composite girders. Embedment lengths of five, six and eight feet were evaluated. Tests indicated a development length of about 72 inches, marginally below the ACI and AASHTO stipulation. Four of eight strands in the girders showed general bond failure nevertheless, the tested girders exceeded their theoretical flexural capacity by 24 to 30 percent. A third composite girder was cast of a high strength normal weight concrete (HSNWC) Type II girder, and topped with a 48" x 8" normal weight 4000-psi concrete deck. This girder was intended as a control specimen to contrast its test results with the HSLWC composite girders.
High-performance/high-strength Lightweight Concrete for Bridge Girders and Decks
High-performance/high-strength Lightweight Concrete for Bridge Girders and Decks - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook High-performance/high-strength Lightweight Concrete for Bridge Girders and Decks write by Thomas E. Cousins. This book was released on 2013. High-performance/high-strength Lightweight Concrete for Bridge Girders and Decks available in PDF, EPUB and Kindle. "TRB's National Cooperative Highway Research Program (NCHRP) Report 733: High-Performance/High-Strength Lightweight Concrete for Bridge Girders and Decks presents proposed changes to the American Association of State Highway and Transportation Officials' Load and Resistance Factor Design (LRFD) bridge design and construction specifications to address the use of lightweight concrete in bridge girders and decks. The proposed specifications are designed to help highway agencies evaluate between comparable designs of lightweight and normal weight concrete bridge elements so that an agency's ultimate selection will yield the greatest economic benefit. The attachments contained in the research agency's final report provide elaborations and detail on several aspects of the research. Attachments A and B provide proposed changes to AASHTO LRFD bridge design and bridge construction specifications, respectively; these are included in the print and PDF version of the report. Attachments C through R are available for download below. Attachments C, D, and E contain a detailed literature review, survey results, and a literature summary and the approved work plan, respectively. Attachment C; Attachment D ; Attachment E; Attachments F through M provide details of the experimental program that were not able to be included in the body of this report. Attachment F; Attachment G; Attachment H; Attachment I; Attachment J; Attachment K; Attachment L; Attachment M. Attachments N through Q present design examples of bridges containing lightweight concrete and details of the parametric study. Attachment N; Attachment O; Attachment P; Attachment Q. Attachment R is a detailed reference list."--Publication information.
