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Coal gangue powder used as pump concrete admixture and preparation method and application thereof

A technology for pumping concrete and coal gangue powder, which is applied in the field of environmental protection and resource reuse, can solve the problems of a large amount of water absorption and admixtures, and achieve the effects of improving environmental problems, alleviating market supply tension, and improving utilization

Pending Publication Date: 2021-08-17
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a coal gangue powder used as a pumping concrete admixture and its preparation method and application, aiming at solving the problem of calcined coal gangue powder absorbing a large amount of water and admixtures in the concrete mixing process, and promoting calcination Wide Application of Coal Gangue Powder in Cement and Concrete

Method used

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  • Coal gangue powder used as pump concrete admixture and preparation method and application thereof
  • Coal gangue powder used as pump concrete admixture and preparation method and application thereof
  • Coal gangue powder used as pump concrete admixture and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] In this example, the effects of calcined coal gangue powder and silane-treated calcined coal gangue powder on the fluidity of cement mortar were compared.

[0032] The operation steps are as follows:

[0033] (1) The natural undisturbed coal gangue is activated by calcination at 750°C, cooled to room temperature, and crushed to produce 4-6mm calcined coal gangue particles;

[0034] (2) Grinding the calcined coal gangue particles obtained in step (1) to a specific surface area of ​​400m 2 / kg of calcined coal gangue powder;

[0035] (3) Soak the calcined coal gangue particles obtained in step (1) in the isobutyltriethoxysilane liquid for 48 hours, so that the silane fully penetrates into the pores of the zeolite;

[0036] (4) Soak the calcined coal gangue particles obtained in step (3) with silane, then filter, dry at 100°C for 24 hours, and grind to a specific surface area of ​​400m 2 / kg, to obtain silane treatment calcined coal gangue powder;

[0037](5) Prepare t...

Embodiment 2

[0041] In this example, the effects of calcined coal gangue powder and silane-treated calcined coal gangue powder on concrete slump and compressive strength were compared. Include the following steps:

[0042] (1) Prepare concrete according to the following three mix ratios. Mixing ratio 1 is the benchmark concrete, mixing ratio 2 is that calcined coal gangue powder is substituted for 15% cement to prepare concrete, and mixing ratio 3 is silane-treated calcined coal gangue powder is used to replace 15% cement to prepare concrete.

[0043] Table 1 Concrete mix ratio (unit: kg / m 3 )

[0044]

[0045] (2) Test the slump loss of the above three kinds of concrete with time according to the "Standard for Test Methods of Performance of Ordinary Concrete Mixtures" (GB / T 50080). The results are shown in Table 2. The test shows that the initial slump of the benchmark concrete (mixing ratio 1) is 205mm, then decreases at an average speed of 0.42mm / min, and reaches 180mm at 60min, w...

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Abstract

The invention relates to the field of environmental protection and resource reutilization, in particular to coal gangue powder used as a pump concrete admixture and a preparation method and application thereof. The preparation method comprises the following steps: calcining natural coal gangue, carrying out hole sealing treatment on the calcined coal gangue by adopting liquid isobutyltriethoxysilane, and finally drying and grinding. When the coal gangue powder prepared by the method is doped into concrete, the early fluidity of the concrete mixture is not obviously reduced, and the production and construction requirements of pump concrete can be met. The construction problem that the fluidity of the concrete is greatly reduced due to the fact that the calcined coal gangue powder is doped into the concrete is solved, meanwhile, on the basis that the isobutyltriethoxysilane can be hydrolyzed in an alkaline environment, the coal gangue powder with holes sealed in the hardened concrete is unsealed, and therefore self-curing of the hardened concrete is facilitated, and the long-term strength and durability of the concrete are improved.

Description

technical field [0001] The invention relates to the fields of environmental protection and resource reuse, in particular to a coal gangue powder used as an admixture for pumping concrete, a preparation method and application thereof. Background technique [0002] In order to protect the environment, save energy and waste, reduce the cost of concrete production, and improve the performance of concrete, now concrete is often mixed with artificial or natural admixtures before or during the mixing process. Common admixtures include fly ash, finely ground slag powder, silica fume, finely ground calcined (spontaneous combustion) coal gangue powder and zeolite powder, and other industrial waste residues. The above-mentioned admixtures all have pozzolanic activity, but their microstructures are quite different. Among them, fly ash is mainly a glass bead structure, which is beneficial to improve the fluidity of concrete when mixed into concrete, and is currently widely used in variou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/04C04B18/12
CPCC04B20/04C04B18/12Y02W30/91
Inventor 柯国军石马刚柯溪澎笛宋百姓
Owner NANHUA UNIV