Author: Marvin Henry Hilton
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
Book Description
Permanent forms for bridge decks have become increasingly more attractive to the construction industry in recent years. Many highway officials however, have reservations concerning the use of permanent steel forms. These reservations are related to the effect the forms might have on the durability of the concrete decks and to the possibility of future corrosion problems. To evaluate the potential for the occurrence of each of these two possibilities, an experience survey and review of prior research were conducted. A survey of 38 states revealed that approximately half of them either disallowed or minimized the use of steel forms because of a fear of future maintenance problems related to their use. A number of disadvantages related to the use of steel forms were cited by the responding states. A composite evaluation of the state survey and the prior research however, indicated that permanent steel forms do not singularly affect the durability of concrete bridge decks. In addition, permanently formed decks generally have less transverse cracking and increased composite action between the deck and the girders. As compared to conventionally formed decks corrosion of steel forms can be a problem if moisture and salt solutions are allowed to gain access to the forms through joints or drainage features, or by other means. Data obtained from atmospheric corrosion tests indicate that galvanized steel forming should have a life expectancy equal to that of the bridge deck if adequately protected from moisture and salt solutions. (Corrosion resulting from the penetration of chlorides through solid concrete to the depth of the forms is unlikely). The main access channels to the forms would appear to be through cracks or deteriorated concrete. It was concluded that steel forms do not have a detrimental effect on initially good quality concrete decks and, with forming installations designed to minimize possible contact with moisture and salts, corrosion should not be a significant problem during the normal life expectancy of a bridge deck.
An Experience Survey on the Use of Permanent Steel Bridge Deck Forms
Author: Marvin Henry Hilton
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
Book Description
Permanent forms for bridge decks have become increasingly more attractive to the construction industry in recent years. Many highway officials however, have reservations concerning the use of permanent steel forms. These reservations are related to the effect the forms might have on the durability of the concrete decks and to the possibility of future corrosion problems. To evaluate the potential for the occurrence of each of these two possibilities, an experience survey and review of prior research were conducted. A survey of 38 states revealed that approximately half of them either disallowed or minimized the use of steel forms because of a fear of future maintenance problems related to their use. A number of disadvantages related to the use of steel forms were cited by the responding states. A composite evaluation of the state survey and the prior research however, indicated that permanent steel forms do not singularly affect the durability of concrete bridge decks. In addition, permanently formed decks generally have less transverse cracking and increased composite action between the deck and the girders. As compared to conventionally formed decks corrosion of steel forms can be a problem if moisture and salt solutions are allowed to gain access to the forms through joints or drainage features, or by other means. Data obtained from atmospheric corrosion tests indicate that galvanized steel forming should have a life expectancy equal to that of the bridge deck if adequately protected from moisture and salt solutions. (Corrosion resulting from the penetration of chlorides through solid concrete to the depth of the forms is unlikely). The main access channels to the forms would appear to be through cracks or deteriorated concrete. It was concluded that steel forms do not have a detrimental effect on initially good quality concrete decks and, with forming installations designed to minimize possible contact with moisture and salts, corrosion should not be a significant problem during the normal life expectancy of a bridge deck.
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
Book Description
Permanent forms for bridge decks have become increasingly more attractive to the construction industry in recent years. Many highway officials however, have reservations concerning the use of permanent steel forms. These reservations are related to the effect the forms might have on the durability of the concrete decks and to the possibility of future corrosion problems. To evaluate the potential for the occurrence of each of these two possibilities, an experience survey and review of prior research were conducted. A survey of 38 states revealed that approximately half of them either disallowed or minimized the use of steel forms because of a fear of future maintenance problems related to their use. A number of disadvantages related to the use of steel forms were cited by the responding states. A composite evaluation of the state survey and the prior research however, indicated that permanent steel forms do not singularly affect the durability of concrete bridge decks. In addition, permanently formed decks generally have less transverse cracking and increased composite action between the deck and the girders. As compared to conventionally formed decks corrosion of steel forms can be a problem if moisture and salt solutions are allowed to gain access to the forms through joints or drainage features, or by other means. Data obtained from atmospheric corrosion tests indicate that galvanized steel forming should have a life expectancy equal to that of the bridge deck if adequately protected from moisture and salt solutions. (Corrosion resulting from the penetration of chlorides through solid concrete to the depth of the forms is unlikely). The main access channels to the forms would appear to be through cracks or deteriorated concrete. It was concluded that steel forms do not have a detrimental effect on initially good quality concrete decks and, with forming installations designed to minimize possible contact with moisture and salts, corrosion should not be a significant problem during the normal life expectancy of a bridge deck.
State of the Art
Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 18
Book Description
This is a summary of the research that has been conducted and the experience that has been gained relative to the use of 2 types of permanent forming for bridge decks: prestressed panel subdecks and permanent steel forms. The use of the precast prestressed concrete panel technique in Texas, studies of 3 inservice bridges, and aspects such as strand development length and cyclic loading are discussed. Similar studies in Pennsylvania and Florida are also described.
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 18
Book Description
This is a summary of the research that has been conducted and the experience that has been gained relative to the use of 2 types of permanent forming for bridge decks: prestressed panel subdecks and permanent steel forms. The use of the precast prestressed concrete panel technique in Texas, studies of 3 inservice bridges, and aspects such as strand development length and cyclic loading are discussed. Similar studies in Pennsylvania and Florida are also described.
Bridge B-20-133 on US-151 with Fiber Reinforced Polymer Reinforced Concrete Deck
Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 104
Book Description
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 104
Book Description
Durability of Steel-formed, Sealed Bridge Decks
Author: Philip Dale Cady
Publisher:
ISBN:
Category :
Languages : en
Pages : 168
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 168
Book Description
Selected Library Acquisitions
Author: United States. Department of Transportation
Publisher:
ISBN:
Category :
Languages : en
Pages : 754
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 754
Book Description
Report
Author:
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 526
Book Description
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 526
Book Description
Synthesis of Highway Practice
Author: National Cooperative Highway Research Program
Publisher: Transportation Research Board
ISBN:
Category : Roads
Languages : en
Pages : 29
Book Description
Publisher: Transportation Research Board
ISBN:
Category : Roads
Languages : en
Pages : 29
Book Description
Prefabricated Bridge Elements and Systems
Author: Michael M. Sprinkel
Publisher: Transportation Research Board National Research
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 88
Book Description
This synthesis will be of interest to bridge designers, maintenance and construction personnel, and others concerned with the design, maintenance, and rehabilitation of bridges. Information is presented on the use of prefabricated elements that can be used to construct new bridges or rehabilitate old ones.
Publisher: Transportation Research Board National Research
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 88
Book Description
This synthesis will be of interest to bridge designers, maintenance and construction personnel, and others concerned with the design, maintenance, and rehabilitation of bridges. Information is presented on the use of prefabricated elements that can be used to construct new bridges or rehabilitate old ones.
Bridges on Secondary Highways and Local Roads
Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 148
Book Description
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 148
Book Description
Highway Research Record
Author:
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 120
Book Description
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 120
Book Description