Low-carbon C130-C140 ultra-high performance self-compacting concrete containing coarse aggregate

Abstract

The invention discloses low-carbon C130-C140 ultra-high-performance self-compacting concrete containing coarse aggregates. Each cubic meter of the concrete is prepared from the following components by weight: 275 to 330 kg of cement, 178.5 to 220 kg of fly ash microbeads, 119 to 180 kg of superfine mineral powder, 52.5 to 110 kg of superfine limestone powder, 695 to 740 kg of 0 to 5 mm fine aggregates, 376 to 396 kg of 5 to 10 mm coarse aggregates, 564 to 594 kg of 10 to 16 mm coarse aggregates, 7 to 12 kg of polycarboxylate superplasticizer and 105 to 110 kg of water, and the total volume weight of the concrete is 2490 to 2520 kg / m < 3 >. Under standard curing, the highest strength is 154.7 MPa in 56 days and 161.6 MPa in 90 days, the rewinding emptying time is 4-8 s, the T500 flow rate is 4-10 s, the self-compacting filling property is higher than the grade II, the adiabatic temperature rise is not higher than 67 DEG C, the self-shrinkage rate in 7 days is not higher than 0.09%, the chloride ion electric flux in 56 days is not higher than 100 coulomb, the sulfate attack resistance reaches KS240 or higher, the construction viscosity can be comparable with that of common C50 concrete, and the concrete has good application prospects. The comprehensive performance and the cost of the concrete are obviously superior to those of the same-grade steel fiber-doped UHPC, and the concrete has wide application value in the fields of offshore wind power and land wind power.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a low-carbon C130-C140 ultra-high performance self-compacting concrete containing coarse aggregate. Background technique [0002] Cement, as the most important cementitious material in concrete, is crucial to the impact of concrete carbon emissions, especially the ultra-high-performance concrete that is currently popular. Domestic ultra-high performance concrete has been developed for nearly 30 years, but from the application point of view, the amount of cement in the mix ratio is as high as 65%. Performance concrete applications pose major constraints, especially for very large structures. Low-carbon and high-performance ultra-high-strength concrete is an important direction of continuous efforts and research by material personnel. [0003] Ultra-high performance concrete is generally regarded as a fiber-reinforced cement-based composite material, that is, ultra-hig...

AI Technical Summary

Problems solved by technology

Domestic ultra-high performance concrete has been developed for nearly 30 years, but from the application point of view, the amount of cement in the mix ratio is as high as 65%. Performance concrete applications pose large constraints, especially for very large structures

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