Ultra-high-stroke pumping anti-crack concrete suitable for cable bent tower structure and preparation method

A concrete and elevation technology, applied in the field of new inorganic non-metallic materials, can solve the problems of difficulty in realizing self-compacting and ultra-high-elevation pumping, limited effect of reducing viscosity and plastic preservation of concrete, affecting the working performance of concrete, etc., so as to reduce the risk of cracking and reduce the Adiabatic temperature rise, the effect of compensating self-shrinkage

Inactive Publication Date: 2020-10-30
SOUTHEAST UNIV +3
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The structural characteristics of the tower and its service environment require the concrete of the tower to have good crack resistance and durability. At present, the commonly used anti-crack measure is fiber crack resistance. However, ordinary admixtures have limited effects on reducing viscosity and maintaining plasticity of concrete. , after adding fiber to high-strength concrete with low water-binder ratio, it will seriously affect the working performance of concrete, and it is difficult to realize its self-compacting and super-elevation pumping

Method used

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  • Ultra-high-stroke pumping anti-crack concrete suitable for cable bent tower structure and preparation method
  • Ultra-high-stroke pumping anti-crack concrete suitable for cable bent tower structure and preparation method
  • Ultra-high-stroke pumping anti-crack concrete suitable for cable bent tower structure and preparation method

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preparation example Construction

[0050] The preparation method of described anti-cracking agent comprises the following steps:

[0051] 1) Heat starch at 140-180°C for 1.5-2.5 hours for pyrolysis, then cool to room temperature,

[0052] 2) Dissolve the product of step 1) in water and stir to form a starch slurry, adjust the pH to 5.5-6.5, add α-amylase, hydrolyze at 30-38°C for 5-8 hours, then adjust the pH to 2-4 to eliminate the enzyme treatment 1h, adjust the pH to be neutral,

[0053] 3) The product obtained in step 2) is placed in a vacuum drying oven to dry and cool to obtain the hydration temperature rise control material;

[0054] 4) The calcium-magnesium composite expansion material is composed of calcium oxide expansion agent and magnesium oxide expansion agent with different activities. The calcium oxide expansion agent is mixed and ground into powder by limestone and gypsum, and then calcined at 1100-1300°C for 60-120min Finally, it can be ground with zeolite powder and fly ash to obtain a calci...

Embodiment 1

[0061] Select above-mentioned prepared anti-cracking agent and viscosity modifying material equivalent to replace cement, fly ash and slag powder, the anti-cracking concrete mix ratio prepared by the method of the present invention is: cement (C) 251kg / m 3 , fly ash (FA) 92kg / m 3 , mineral powder (BFS) 51kg / m 3 , anti-cracking agent (HME-V) 38kg / m 3 , viscosity modified material (VMM) 38kg / m 3 , gravel (G) 1002kg / m 3 , river sand (S) 756kg / m 3 , water (W) 146kg / m 3 , high-performance polycarboxylate superplasticizer (PC-A) 6.11kg / m 3 ;

Embodiment 2

[0078] Taking raw materials by weighing table 2 to prepare C50 cable tower structure ultra-elevation pumping anti-cracking concrete is embodiment 2, and the concrete mix ratio of comparative example 2 is shown in table 2; embodiment 2 and the concrete performance and pumping of comparative example 2 gained The performance results are shown in Table 3, the mechanical properties and durability results are shown in Table 4, and the deformation performance results are shown in Table 4. figure 1 As shown, the adiabatic temperature rise results are shown in figure 2 shown.

[0079] Table 2 C50 cable tower structure ultra-elevation pumping crack-resistant concrete and comparative example 2 concrete mix ratio (unit: kg / m 3 )

[0080] serial number C FA BFS VMM HME-V S G W PC-A Comparative example 2 282 117 71 0 0 745 989 146 6.11 Example 2 251 92 51 38 38 745 989 146 6.11

[0081] Table 3 Example 2 and Comparative Example 2 C...

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PUM

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Abstract

The invention discloses ultra-high-stroke pumping anti-crack concrete suitable for a cable bent tower structure and a preparation method thereofe. The anti-crack concrete is prepared from the following components: 240-300kg / m < 3 > of cement, 90-130kg / m < 3 > of fly ash, 50-80kg / m < 3 > of mineral powder, 35-45 kg / m < 3 > of an anti-crack agent, wherein the anti-crack agent is prepared from the following components; the content of each component is shown in the specification: 1-2.5 kg / m < 3 > of hydration temperature rise regulation material; 32.5-44 kg / m < 3 > of a calcium-magnesium compositeexpansion material, 30-40 kg / m < 3 > of a viscosity modification material, 950-1150 kg / m < 3 > of crushed stone, 700-820 kg / m < 3 > of river sand, 145-160 kg / m < 3 > of water and 5-8 kg / m < 3 > of ahigh-performance polycarboxylate superplasticizer. The concrete has the characteristics of better working performance, mechanical performance, pumping performance and crack resistance, better matchingof an expansion process with a concrete temperature process and a shrinkage process, better durability and important practical engineering application value.

Description

technical field [0001] The invention belongs to the field of new inorganic non-metallic materials of civil engineering and construction science and technology, and specifically relates to a super-elevation pumping crack-resistant concrete suitable for cable tower structures and a preparation method thereof. Background technique [0002] Through the investigation of the long-span concrete bridges that have been built in China, it is found that the cracking phenomenon of concrete towers is relatively common. Judging from the appearance time, the cracks in the cable tower generally occur in the early stage of construction, that is, the period from the final setting of the concrete to 90 days mainly appears in the early stage of construction; from the appearance shape, the crack shape mainly appears as a vertical crack on the surface. As the fatigue load of the main tower continues to be applied, the cracks gradually expand, and in severe cases, vertical penetrating cracks appea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/34
CPCC04B28/04C04B2111/00146C04B2111/343C04B2201/50C04B18/08C04B18/12C04B24/38C04B22/064C04B22/066C04B18/082C04B14/06C04B14/068C04B24/24
Inventor 刘加平闫志刚钱国华张士山李军堂徐文
Owner SOUTHEAST UNIV
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