Technologies for Improving the Evaluation and Repair of Concrete Bridge Decks PDF Download
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Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 294
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Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 294
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Book Description
Author: Michel Alexander
Publisher:
ISBN:
Category :
Languages : en
Pages : 283
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Book Description
A significant number of concrete bridge decks, both public- and nonpublic use, in the United States are subjected to a variety of detrimental environmental conditions. Many of the decks are in northern regions and are subject to cold weather; some of these are subjected to further degradation from the applications of deicing salts. The current major distress noted is the occurrence of shallow delaminations resulting in horizontal voids below the surface of the decks. It appears the majority of the delaminations are caused by freezing and thawing action, by chloride attack that corrodes the reinforcement, and by alkali-silica reaction. All three attack mechanisms require the presence of moisture. Efforts to design and place a dense, impermeable concrete are hindered at times due to the porous nature of concrete. As the concrete ages, a micro system of tension cracks and other surface imperfections can develop, exposing the matrix to water and chloride infiltration. Water infiltration alone can lead to accelerated alkali-silica reaction and steel-reinforcement corrosion. Surface spalling not only reduces ride quality, but it leads to more serious problems including structural deterioration and failure. Many concrete sealers and penetrants on the market are designed to protect concrete by improving and enhancing its physical properties. Surface sealers such as silane, silicones, and siloxanes have been developed to prevent the infiltration of moisture and chlorides. Penetrants such as high molecular weight methacrylate (HMWM) and epoxies have been developed to penetrate and fill cracks and porous areas in the concrete, sealing it against the infiltration of air, water, and chloride. Once the concrete is effectively sealed, both the progression of alkali-silica reaction and the corrosion of the reinforcing steel are arrested. These materials are also designed to bond to the concrete and thus to the structural integrity of the concrete.
Author: University of Nebraska--Lincoln. Center for Infrastructure Research
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages :
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Author: Joseph H. Brisch
Publisher: ASTM International
ISBN: 080312600X
Category : Masonry
Languages : en
Pages : 169
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Book Description
Papers from a June 2006 symposium report on recent work in cement, lime, mortars for unit masonry, and manutactured masonry units. Some specific topics covered include investigation and repair of glazed brick cladding, the benefits and problems of ASTM C 1324 for analyzing hardened masonry mortars, time-of-cooling effects on mortar joint color, and the selection and use of natural and manufactured stone adhered veneer. Other subjects examined include defection criteria for masonry beams, the effect of void area on brick masonry performance, seismic evaluation of low-rise reinforced masonry buildings with flexible diaphragms, and greening of mortars. B&w photos and illustrations are included. Trimble is affiliated with the Brick Industry Association. Brisch is affiliated with Rockwell Lime Company. There is no subject index.
Author:
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 1152
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Author:
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 1150
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Author: Michael Brokaw
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 5
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Book Description
ODOT's current method of evaluating wearing surfaces on bridge decks involve, primarily, a visual inspection from the shoulder(s) every calendar year. Most deficiencies, except delaminations, can be visually spotted. On roads with low-levels of off-peak traffic, inspectors can, in small windows of time, safely walk out into lanes, look closely at the surface and maybe even strike the surface with a hammer to confirm a delamination. On heavily traveled roads or narrow shoulders it is near-impossible to inspect for delaminations without closing down lane(s) of traffic. Equally the heavier-traveled bridges represent the bigger investment. ODOT's Office of Structural Engineering conducted an in-house evaluation of a truck mounted Impact Echo technology regionally, around the state, on at-risk wearing surfaces with District Bridge Engineers. This technology has the potential to improve accuracy, reliability for the Department's most allocated bridge component. It also has the potential to safeguard the Department's most important resource - its employees.
Author: Kenneth C. Clear
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 52
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Author: Ahmed Al-Ostaz
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 370
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Author: David W. Fowler
Publisher:
ISBN:
Category : Polymer-impregnated concrete
Languages : en
Pages : 36
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