Manufactured sand self-compacting concrete applied to corrugated steel web box girder

Abstract

The invention belongs to the field of building materials and in particular relates to manufactured sand self-compacting concrete applied to a corrugated steel web box girder. The manufactured sand self-compacting concrete is prepared from the following raw materials in parts by weight: 431 to 437 parts of cement, 78 to 85 parts of fly ash, 637 to 655 parts of manufactured sand, 1097 to 1112 partsof crushed stones with the grain diameter of 5mm to 20mm, 4.7 to 5.1 parts of a water reducing agent and 165 parts of water. The manufactured sand is continuously-graded region II manufactured sand, the fineness modulus is 2.7 to 3.0, the MB value is less than 1.4 and the content of mountain flour is 6 percent to 8 percent. The crushed stones are continuously-graded crushed stones; the mass ratioof the crushed stones with the grain diameter of 5mm to 10mm to the crushed stones with the grain diameter of 10mm to 20mm is 3 to 7. The concrete provided by the invention is prepared by replacing river sand with the manufactured sand which is graded well, and has the advantages of good working performance and good flowability and filling performance; the manufactured sand self-compacting concrete has relatively high mechanical strength and can meet pouring requirements of the corrugated steel web combined box girder, and the cost is relatively low.

Description

technical field [0001] The invention belongs to the field of building materials, and specifically refers to a machine-made sand self-compacting concrete applied to corrugated steel web box girders. Background technique [0002] The combined structure of the box girder with corrugated steel webs is complex and varied. The connection parts of the concrete top and bottom plates of the box girder and the corrugated steel webs have complex structures and dense reinforcement. It is difficult to vibrate during the pouring process, so the flow of concrete High performance and self-compacting performance put forward extremely high requirements. At present, ordinary concrete is mostly used for cast-in-place box girders, which has high viscosity and poor fluidity, and is not suitable for pouring construction of concrete components with complex structures. Special concrete for the development of web box girders. [0003] Ordinary self-compacting concrete uses a large amount of cementit...

AI Technical Summary

Problems solved by technology

[0002] The combined structure of the box girder with corrugated steel webs is complex and varied. The connection parts of the concrete top and bottom plates of the box girder and the corrugated steel webs have complex structures and dense reinforcement. It is difficult to vibrate during the pouring process, so the flow of concrete High performance and self-compacting performance put forward extremely high requirements. At present, ordinary concrete is mostly used for cast-in-place box girders, which has high viscosity and poor fluidity, and is not suitable for pouring construction of concrete components with complex structures. Special concrete for web box girder research and development

[0003] Ordinary self-compacting concrete uses a large amount of cementitious material, and the manufacturing cost is significantly higher than that of ordinary concrete

In addition, river sand, which was widely used in concrete formulations in the past, has now been mined. The price of commercial river sand is high, the quality is unstable, and the supply fluctuates greatly, which easily affects the construction period and increases the project cost.

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