Author: Vernon J. MarksPublisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 18
Book Description
Effects of Special Aggregate on Bridge Deck Overlay Frictional Properties
Author: Vernon J. MarksPublisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 18
Book Description
Planning and Research Program
Author: Iowa. Department of TransportationPublisher:
ISBN:
Category : Transportation
Languages : en
Pages : 100
Book Description
Iowa Documents
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 452
Book Description
Annual Report, Highway Research and Development in Iowa for the Fiscal Year Ending June 30 ...
Author: World Survey of Current Research and Development on Roads and Road Transport
Author: Early Age Performance of Latex-modified Concrete Bridge Deck Overlays
Author: Suvimol SujjavanichPublisher:
ISBN:
Category : Concrete
Languages : en
Pages : 294
Book Description
Environmental factors and physical properties of latex modified concrete (LMC) are hypothesized to contribute to early age cracking in bridge deck overlays. Cracking permits the ingress of moisture and aggressive solutions into the substrate and may contribute to other subsequent distresses. Understanding the material properties and mechanisms involved is necessary to minimize these distresses. This research consisted of a two part study: first, the development of LMC strength and fracture properties at ages ranging from 5 hours to 28 days was studied, and secondly, the effects of the environment on LMC distresses were modelled. Environmental conditions: temperature, solar energy, and wind speed were determined from weather records. A fracture mechanics based model, the Fictitious Crack Model (FCM), incorporating finite element analyses and superposition techniques was employed with material properties from the first part of study on LMC performance. Different bilinear strain softening diagrams were used to predict fracture performance at different ages. The predictions agreed well with the test data. The impacts of temperature differentials on crack development were studied. The shrinkage effect was also indirectly incorporated through the temperature analysis. The material properties study indicated significant changes in strength, deformability and fracture properties, particularly during the early age. The developments differ slightly from conventional concrete. Test results indicated a significant improvement in reducing and bridging microcracks, especially in the prepeak-load region. Fracture toughness and deformability increased significantly with time. Fracture energy varied from 2.3 to 133.1 N/m, depending on age, and to some degree, on notch depth ratio. In the second stage, the FCM provided a reasonable prediction for crack initiation and propagation when only temperature effects are of concern. Age, surface conditions and structural restraint strongly affect crack resistance of the overlays. Only slight effects were observed from the overlay thickness in the study range (51-76 mm). Shallow preexisting cracks possibly reduce the crack resistance of the overlay about 30 percent. A prolonged moist cure for 48 hours after placing is suggested to reduce the risk of cracking. With available environmental information, it is possible to develop guidelines for appropriate environmental conditions for LMC bridge deck construction to minimize the risk of early age cracking.
Effects of Superstructure Properties on Concrete Bridge Deck Deterioration
Author: Sanya Mackela JohnsonPublisher:
ISBN:
Category :
Languages : en
Pages : 208
Book Description
Long-term Performance of Polymer Concrete for Bridge Decks
Author: David W. FowlerPublisher: Transportation Research Board
ISBN: 0309143543
Category : Technology & Engineering
Languages : en
Pages : 75
Book Description
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 423: Long-Term Performance of Polymer Concrete for Bridge Decks addresses a number of topics related to thin polymer overlays (TPOs). Those topics include previous research, specifications, and procedures on TPOs; performance of TPOs based on field applications; the primary factors that influence TPO performance; current construction guidelines for TPOs related to surface preparation, mixing and placement, consolidation, finishing, and curing; repair procedures; factors that influence the performance of overlays, including life-cycle cost, benefits and costs, bridge deck condition, service life extension, and performance; and successes and failures of TPOs, including reasons for both.
Monthly Checklist of State Publications
Author: Library of Congress. Exchange and Gift DivisionPublisher:
ISBN:
Category : State government publications
Languages : en
Pages : 650
Book Description
June and Dec. issues contain listings of periodicals.
Recent Transportation Literature for Planning and Engineering Librarians
Author: University of California, Berkeley. Institute of Transportation Studies. LibraryPublisher:
ISBN:
Category : Transportation
Languages : en
Pages : 528
Book Description