What is ultra high performance concrete? What is the difference between it and ordinary concrete and its use?

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Ultra High Performance Concrete (UHPC), also known as Ultra-High Performance Concrete (RPC), is the most innovative cement-based engineering material in the past three decades, achieving the performance of engineering materials. Big leap.

UHPC is a special concrete with ultra high strength, ultra low water absorption, super durability and erosion resistance. UHPC currently used in the field of architectural design (different from the structural field) has a compressive strength greater than 120 and a flexural strength greater than 25 MPa. Although UHPC can achieve high compressive strength, for thin building components, UHPC’s flexural strength is mainly utilized. In practical applications, the ultra-high strength of the UHPC matrix is ​​further enhanced and toughened by a small amount of alkali-resistant glass fiber, polyvinyl alcohol fiber, and steel fiber.

The types of fibers commonly used in UHPC include high carbon steel, PVA, glass, carbon, and the like. This material is very malleable and has the ability to deform and support bending and stretching even after initial cracking. The high compression and tensile properties of UHPC also help to increase the bond strength and thus reduce the buried length of the steel in applications such as gate placement between preforms.

The difference between ultra high performance concrete, high performance concrete and ordinary concrete

Ordinary concrete NSC High performance concrete HPC Ultra high performance concrete UHPC
Compressive strength (MPa)
20-40
40-96
120-180
Water to glue ratio
0.40-0.70
0.24-0.35
0.14-0.27
Cylindrical splitting tensile strength (MPa)
2.5-2.8
4.5-24
Maximum aggregate granules (mm)
19-25
9.5-13
0.4-0.6
Porosity
20-25%
10-15%
2-6%
Hole size (mm)
0.000015
toughness
250 times larger than NSC
Fracture energy (kN·m/m)
0.1-15
10-40
Modulus of elasticity (GPa)
14-41
31-55
37-55
Mode of rupture (first crack) (MPa)
2.8-4.1
5.5-8.3
7.5-15
Ultimate bending strength (MPa)
18-35
Breathability k (24 hours 40C) (mm)
3×10
0
0
Water absorption rate
<10%
<6%
<5%
Chloride diffusion coefficient (steady state diffusion) (mm 2 /s)
<2x10e-12
Carbon dioxide/sulfate penetration
Freeze-thaw resistance
10% durable
90% durable
100% durable
Resistance to surface ablation
Surface ablation amount >1
Surface ablation amount 0.08
Surface ablation amount 0.01
Poisson’s ratio
0.11-0.21
0.19-0.24
Creep coefficient, Cu
2.35
1.6-1.9
0.2-1.2
shrink
Liquidity (workability) (mm)
Measuring slump
Measuring slump
Measuring slump
Gas content
4-8%
2-4%
2-4%

Use of ultra high performance concrete

Ultra-high performance concrete has been successfully applied to bridges, subways, dams, stairs, balconies and other projects abroad. In 2005, Shenyang prefabricated the beam and slabs of industrial plants with ultra-high performance concrete (C140), which was the first application of ultra-high performance concrete in China. Ovim replaces cast iron or cast steel with ultra-high performance concrete. The compressive strength of heat-cured ultra-high performance concrete is 325 MPa, and the compressive strength of natural curing concrete is 187 MPa.

The China Railway 19th Bureau successfully applied ultra-high performance concrete to the cable trough cover of Shiwu Passenger. The project has prepared ultra-high-performance concrete with cement, slag powder, silica fume, quartz sand and steel fiber, and used steam curing to prepare the high-performance concrete compressive strength of 139. 9 MPa. Later, ultra-high-performance concrete was applied more in railways, viaducts and other engineering projects, which not only completely solved the two world technical problems of bridge deck fatigue cracking and pavement damage in some large-span steel bridge deck pavement, and It will be another important turning point in the history of concrete development, which will vigorously promote the advancement of bridge technology.

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