01333197

Component

https://doi.org/10.3141/2251-07

http://scholar.google.com...euse&publication_year=2011

One of the latest advancements in concrete technology is ultra-high-performance concrete (UHPC), a fiber-reinforced, densely packed material that exhibits increased mechanical performance and superior durability compared with normal- and high-strength concretes. UHPC has great potential to be used in the bridge market in the United States. However, to gain acceptance by designers, contractors, precasters, and owners, this material needs to be tested according to ASTM Inter­national and AASHTO standards, and new practices must be developed. The variability in performance that is based on new challenges of mixing and curing must also be considered. The effects of curing regimes and specimen age on the strength and durability properties of a fiber-reinforced UHPC were investigated. Regardless of when the thermal treatment was applied, UHPC consistently attained compressive stresses above 30 ksi (207 MPa), a modulus of elasticity of approximately 8,000 ksi (55 GPa), and a Poisson’s ratio of 0.21. Flexural characteristics were enhanced with high-temperature curing. UHPC also demonstrated extremely high resistance to freeze–thaw cycling (with a durability factor of more than 100), coefficient of thermal expansion values only slightly higher than that of normal-strength concrete, and negligible chloride ion penetration. Furthermore, modified versions of ASTM and AASHTO standard testing methods were employed to aid in development of draft standards for testing some UHPC material properties in the United States that will eventually lead to a national design code.

01361668

11-1800

English

pp 68-75

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167710

Print

Figures (1) ; References (15) ; Tables (6)

Compressive strength; Concrete bridges; Concrete curing; Durability; Fiber reinforced concrete; Flexural strength; Freeze thaw durability; High performance concrete; Modulus of elasticity; Poisson ratio; Test procedures; Ultra high performance concrete

AASHTO Standard Specifications for Transportation Materials and Methods of Sampling and Testing; American Society for Testing and Materials

Chloride penetration; Coefficient of thermal expansion

Bridges and other structures; Highways; Materials; I32: Concrete

PRP, TRIS, TRB, ATRI

Feb 17 2011 5:55PM

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