Anti-crack pumping concrete, and preparation method and pumping method thereof

Abstract

The invention discloses an anti-crack pumping concrete, and a preparation method and a pumping method thereof, and belongs to the field of concrete preparation. The anti-crack pumping concrete comprises, by weight, 380-420 parts of cement, 1050-1210 parts of coarse aggregates, 630-675 parts of fine aggregates, 58-72 parts of fly ash, 40-78 parts of S95-grade mineral powder, 45-60 parts of silica fume, 0.8-5 parts of a polypropylene fiber, 12.5-15.1 parts of a polycarboxylate superplasticizer and 128-136 parts of water. The water-cement ratio is controlled to be 0.28-0.34; the water-binder ratio is controlled to be 0.23-0.27, the fly ash accounts for 10-13% of the total amount of all cementing materials, the mineral powder accounts for 7-14% of the total amount of all the cementing materials, the silica fume accounts for 7-11% of the total amount of all the cementing materials, the ratio of the fly ash to the mineral powder is controlled to be 1.2-1.68, and the sand rate is controlled to be 0.3-0.39. The anti-cracking pumping concrete has a high strength, and can meet the pumping requirement of 100 m superhigh-rise building construction.

Description

technical field [0001] The invention discloses crack-resistant pumping concrete, a preparation method and a pumping method thereof, and belongs to the field of concrete preparation. Background technique [0002] As urbanization enters a new stage of development, more and more companies choose to build super high-rise buildings as corporate headquarters and commercial complexes. In recent years, the market for super high-rise buildings has expanded significantly, and the demand for high-strength and high-performance concrete continues to grow. . On the one hand, it is required that the concrete has high strength and good working performance. On the other hand, high-level pumping must be achieved through pumping machinery. At the same time, high-strength concrete will not crack after being cured and formed, and the forming effect is better. [0003] Ordinary concrete is still the most widely used building material in the construction field. However, with the tightening of env...

AI Technical Summary

Problems solved by technology

Although this type of concrete can be used for high-rise pumping, the strength of this type of concrete is low. When used in super-high-rise buildings, the cross-section of its components is large, which leads to the limitation of the internal space pattern of the building. At the same time, this type of concrete has poor durability. In addition, When this concrete is used in mass concrete structures, more safeguards need to be taken during the construction process to avoid or reduce concrete cracks, and the process control is more difficult

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