28
1 Static Mechanical Properties of UHPCC
(2) For the axial compressive behavior of UHPCC, the axial compressive strength
increases with the rising of the steel fiber content, but almost keeps unchanged
when the steel fiber content is larger than 1.0%, and the steel fiber type almost
has no influence. Addition of steel fibers has little influence on the compressive elastic modulus, Poisson’s ratio and the pre-peak behavior of compressive stress–strain curves, but considerably influences the post-cracking ductile
behavior.
(3) For the direct tensile strength of UHPCC, incorporation of steel fibers can
effectively improve the tensile strength, and the present micro-straight steel
fiber has a greater influence than the hooked steel fiber.
(4) For the four-point flexural properties of UHPCC, addition of steel fibers has
little effect on the first crack flexural strength and the corresponding deflection,
while it has favorable effect on the flexural strength, load carrying capacity and
energy absorption capacity. When the steel fiber content is more than 1.5%,
adding the present micro-straight steel fiber is more efficient than the hooked
steel fiber.
(5) For the three-point flexural properties of UHPCC, the fracture toughness has
significant improvement with the addition of steel fibers, while the steel fiber
type has little influence on it. The fracture energy increases steadily with the
increase of steel fiber content, and the effect of micro-straight steel fiber is
more remarkable.
References
ABBAS S, SOLIMAN A M, NEHDI M L. Exploring mechanical and durability properties of ultrahigh performance concrete incorporating various steel fiber lengths and dosages[J]. Construction
and Building Materials, 2015, 75: 429-441.
ASTM C1018-97. Structural test method for flexural toughness and first crack strength of fiber
reinforced concrete (using beam with third point loading)[S]. American Society for Testing and
Materials, 1998: 514–551.
ASTM C1609/C1609M-12. Structural test method for flexural performance of fiber reinforced
concrete (using beam with third point loading)[S]. American Society for Testing and Materials,
2012: 1–9.
Comite Euro-International du Beton. fib Model Code for Concrete Structures 2010[M]. Trowbridge,
Wiltshire, UK: Redwood Books, 2013.
DL/T5332–2005. Norm for fracture test of hydraulic concrete[S]. Electric Power Industry Standard
of the People’s Republic of China, 2006. (in Chinese)
FAN X Q, HU S W, LU J. Experimental research on double-K fracture toughness of non-standard
three point bending concrete beam[J]. Journal of Building Structures, 2012, 33(10): 152-157. (in
Chinese)
GB-T50081–2002. Standard for test method of mechanical properties on ordinary concrete[S].
Beijing, China: 2003. (in Chinese)
GRAYBEAL B A. Material property characterization of ultra-high performance concrete: FHWAHRT-06-103[R]. VA: U.S. Department of Transportation Federal highway Adminstration, 2006:
1-186.
1 Static Mechanical Properties of UHPCC
(2) For the axial compressive behavior of UHPCC, the axial compressive strength
increases with the rising of the steel fiber content, but almost keeps unchanged
when the steel fiber content is larger than 1.0%, and the steel fiber type almost
has no influence. Addition of steel fibers has little influence on the compressive elastic modulus, Poisson’s ratio and the pre-peak behavior of compressive stress–strain curves, but considerably influences the post-cracking ductile
behavior.
(3) For the direct tensile strength of UHPCC, incorporation of steel fibers can
effectively improve the tensile strength, and the present micro-straight steel
fiber has a greater influence than the hooked steel fiber.
(4) For the four-point flexural properties of UHPCC, addition of steel fibers has
little effect on the first crack flexural strength and the corresponding deflection,
while it has favorable effect on the flexural strength, load carrying capacity and
energy absorption capacity. When the steel fiber content is more than 1.5%,
adding the present micro-straight steel fiber is more efficient than the hooked
steel fiber.
(5) For the three-point flexural properties of UHPCC, the fracture toughness has
significant improvement with the addition of steel fibers, while the steel fiber
type has little influence on it. The fracture energy increases steadily with the
increase of steel fiber content, and the effect of micro-straight steel fiber is
more remarkable.
References
ABBAS S, SOLIMAN A M, NEHDI M L. Exploring mechanical and durability properties of ultrahigh performance concrete incorporating various steel fiber lengths and dosages[J]. Construction
and Building Materials, 2015, 75: 429-441.
ASTM C1018-97. Structural test method for flexural toughness and first crack strength of fiber
reinforced concrete (using beam with third point loading)[S]. American Society for Testing and
Materials, 1998: 514–551.
ASTM C1609/C1609M-12. Structural test method for flexural performance of fiber reinforced
concrete (using beam with third point loading)[S]. American Society for Testing and Materials,
2012: 1–9.
Comite Euro-International du Beton. fib Model Code for Concrete Structures 2010[M]. Trowbridge,
Wiltshire, UK: Redwood Books, 2013.
DL/T5332–2005. Norm for fracture test of hydraulic concrete[S]. Electric Power Industry Standard
of the People’s Republic of China, 2006. (in Chinese)
FAN X Q, HU S W, LU J. Experimental research on double-K fracture toughness of non-standard
three point bending concrete beam[J]. Journal of Building Structures, 2012, 33(10): 152-157. (in
Chinese)
GB-T50081–2002. Standard for test method of mechanical properties on ordinary concrete[S].
Beijing, China: 2003. (in Chinese)
GRAYBEAL B A. Material property characterization of ultra-high performance concrete: FHWAHRT-06-103[R]. VA: U.S. Department of Transportation Federal highway Adminstration, 2006:
1-186.