C115-C140 ultra-high-performance self-compacting concrete for offshore wind power floating type foundation

Abstract

The invention discloses a C115-C140 ultra-high performance self-compacting concrete for an offshore wind power floating type foundation. Each cubic meter of concrete comprises the following components by weight: 700 to 750 kg of a cementing material, 675 to 800 kg of a fine aggregate, 875 to 1010 kg of a coarse aggregate, 7 to 16 kg of a water reducing agent and 105 to 120 kg of water, and the total volume weight of the concrete is 2480 to 2530 kg / m<3>. The material has the following characteristics that under standard curing, the highest strength is 155 MPa in 56 days and 163 MPa in 90 days, the lowest cement consumption per cubic meter is 245 kg, the rewinding emptying time is 4-8 s, the T500 flow rate is 5-10 s, the self-compaction filling property is higher than the grade II, the adiabatic temperature rise is not higher than 68.5 DEG C, the self-shrinkage rate in 7 days is not higher than 0.08%, the chloride ion electric flux in 56 days is not higher than 100 coulomb, and the sulfate erosion resistance reaches KS240 or higher. The construction viscosity of the material can be comparable with that of common C50 concrete, the comprehensive performance and cost of the concrete are obviously superior to those of the same-grade steel fiber doped UHPC, the concepts of high performance, greenness and low carbon are met, and the material has wide application value in the fields of offshore wind power and onshore wind power.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a C115-C140 ultra-high-performance self-compacting concrete for offshore wind power floating foundations. Background technique [0002] With the intensification of global climate problems, the world has gradually paid more attention to the acquisition of clean energy and technology research. The research and utilization of wind energy resource technology in foreign countries was earlier, but the wind power technology in my country started relatively late, and the current proportion of onshore wind power application is much larger than maritime. However, with the advancement of wind power technology and the influence of the national "dual carbon" strategy, the electricity price subsidy model has become a thing of the past. Onshore wind power has relatively low power generation, relatively small power generation capacity, land occupation, disturbing residents and disturbi...

AI Technical Summary

Problems solved by technology

[0005] At present, domestic C120 and above concrete is mainly used in bridge deck pavement and various small prefabricated decorative components. This type of concrete is usually called UHPC (fiber-reinforced cement-based composite material), but if the reinforcing effect of steel fibers is not considered, The actual strength of the concrete is reduced by about 20-30MPa

In addition, none of them considered the heat of hydration and construction problems brought about by large-volume structures, shrinkage crack control problems, and the actual durability of giant components in complex erosion environments.

Although the strength of UHPC for bridge deck pavement mixed with a large amount of steel fibers is generally as high as C120 or above, its thickness is less than 10 cm. Usually, its high viscosity, slow flow rate, huge shrinkage and hydration temperature rise of above 80 °C limit this. Wide application of similar materials in giant and large-volume components

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