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C80 concrete, concrete filled steel tube and preparation method thereof

A technology of concrete and mixture, which is applied in the field of building materials, can solve the problems of long initial setting time and unsatisfactory conditions, and achieve the effects of good pumping performance, moderate viscosity, micro-expansion compensation shrinkage and super long initial setting time

Inactive Publication Date: 2020-06-30
SICHUAN DEPT OF TRANSPORTATION HIGHWAY PLANNING PROSPECTING & DESIGN RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the fact that the strength grade of the concrete used in the pipe of the concrete-filled steel pipe arch bridge in the prior art is C60 at most, which cannot meet the needs of some ultra-long-span and ultra-high concrete-filled steel pipe arch bridges for a higher strength grade of the concrete used in the pipe, the present invention provides a C80 concrete, steel pipe Concrete and its preparation method. The C80 concrete has the advantages of good fluidity and cohesion, micro-expansion, compensation for shrinkage, and super-long initial setting time, and can meet the pouring and use requirements of steel tube concrete arch bridges.

Method used

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  • C80 concrete, concrete filled steel tube and preparation method thereof
  • C80 concrete, concrete filled steel tube and preparation method thereof
  • C80 concrete, concrete filled steel tube and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] prepare concrete

[0035] Raw materials:

[0036] Cement: Chongqing Huaxin Diwei Cement Co., Ltd., ordinary Portland cement P.O 42.5.

[0037] Sand: Mount Emei, the place of origin, fineness modulus 2.98, apparent density 2926kg / m 3 , stone powder content 7.9%, crushing value 7%, 7%, 11%, 12%.

[0038] Crushed stone: Mount Emei, the place of origin, 5-16mm continuous gradation (the ratio of 5-10mm particle size to 10-16mm particle size is 3:7), apparent density 2951kg / m 3 , crushing value 13.9%, mud content 0.4, mud block content 0%, needle flake 0%, parent rock compressive strength 168MPa.

[0039] Water reducer: Shanghai Sanrui Polymer Materials Co., Ltd., polycarboxylate high-performance water reducer; 2 / 10,000 to 3 / 10,000 air-entraining agent is added to the polycarboxylate high-performance water reducer agent.

[0040] Expansion agent: Wuhan Sanyuan Special Building Materials Co., Ltd., FQY high-performance expansion agent; the main components of the FQY high-...

Embodiment 2

[0054] The C80 concrete filled steel pipe prepared in Example 1 was used to pour the main arch of a highway bridge in Hejiang.

[0055] Before the concrete is poured, the surface of the pump pipe is covered with cotton cloth. During the pouring process, water is sprinkled on the cotton cloth to keep the cotton cloth covering the pump pipe in a wet state.

[0056] The particle size of gravel (pebble) shall not be greater than 1 / 3 of the diameter of the pump pipe. Use a shaping machine to shape the gravel (pebble) to make the particle shape of the gravel (pebble) regular, and reduce the relative movement of concrete when pumping concrete resulting pumping resistance.

[0057] The prepared C80 concrete has excellent pumping performance. It adopts a three-stage relay pouring process. The vertical height of jacking pouring reaches 150m, the arc length of the main arch (half arch) is 380m, and the ambient temperature during pouring reaches 28℃~35℃. The time is 12 hours, the pumping...

Embodiment 3-6

[0059] Carry out C80 steel tube concrete mixing in the same concrete mixing station as embodiment 1, the source of raw material composition purchasing used for mixing is identical with embodiment 1, and the addition application weight of various raw material composition is as shown in table 3.

[0060] Table 3 Example 3-6 Stirring of C80 concrete-filled steel pipe concrete to add raw material components Quantity per square meter (kg)

[0061]

[0062]

[0063] According to the same method (test procedure) as in Example 1, the mixing preparation of C80 concrete was carried out, and the test results are shown in Table 4.

[0064] Table 4 Example 3-6 prepares the performance test of C80 concrete filled steel pipe

[0065]

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Abstract

The invention relates to C80 concrete, a concrete filled steel tube and a preparation method thereof. The C80 concrete comprises the following raw materials by weight: 430-480 kg / m < 3 > of cement; 65-73kg / m < 3 > of fly ash microspheres; 50-58 kg / m < 3 > of silica fume; 940-980 kg / m < 3 > of broken stone; 710-750 kg / m < 3 > of sand; 52-58 kg / m < 3 > of an expanding agent; and 9.00-10.00 kg / m < 3> of a polycarboxylate superplasticizer; and air entraining agent , and 150-170kg / m < 3 > of water; wherein the mass of the air entraining agent is 0.02%-0.03% of that of the polycarboxylate superplasticizer. The preparation method comprises the following steps: 1, proportionally stirring and mixing cement, fly ash microspheres, silica fume, macadam and sand to obtain a mixture; and 2, mixing themixture obtained in the step 1 with the expanding agent, the polycarboxylate superplasticizer, the air entraining agent and water, and uniformly stirring to obtain the C80 concrete. And the prepared C80 concrete has the advantages of good fluidity and cohesiveness, micro-expansibility compensation shrinkage, ultra-long initial setting time and the like, can meet the pouring and use requirements ofa large-span concrete-filled steel tube arch bridge, and fills the technical blank of ultrahigh-strength high-flow-state concrete-filled steel tube preparation and ultrahigh and ultra-long-distance pumping.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a C80 concrete, steel tube concrete and a preparation method thereof. Background technique [0002] Due to the advantages of high material strength, convenient construction, and beautiful appearance, the CFST arch bridge has been rapidly developed in the transportation infrastructure construction. Concrete-filled steel tubes refer to the components formed by filling concrete in steel tubes. The principle of concrete-filled steel tubes can be compared to reinforced concrete columns with spiral reinforcement: the core concrete is in a three-dimensional compression state under the action of dense spiral bars, so that the core The compressive strength of concrete is significantly improved. Due to the clamping force of the steel pipe on the concrete, the bearing capacity of the concrete inside the pipe is greatly improved, and at the same time, the restraint effect of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/70
CPCC04B28/04C04B2111/00146C04B2111/70C04B18/08C04B18/146C04B14/02C04B14/068C04B22/06C04B22/064C04B2103/302
Inventor 牟廷敏赵艺程梁健倪春梅范碧琨周孝军李胜孙才志李成君汪洋范翊康玲何易修王戈邹圻
Owner SICHUAN DEPT OF TRANSPORTATION HIGHWAY PLANNING PROSPECTING & DESIGN RES INST
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