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Processing method of high-compactness concrete precast slab capable of preventing surface cracking

A processing method and concrete technology, which is applied in the field of concrete prefabricated slabs, can solve the problems of prefabricated slabs such as insufficient strength, surface water seepage, surface shedding, etc., and achieve the effects of improving molding strength and compactness, improving overall bearing capacity, and preventing water seepage and cracking

Inactive Publication Date: 2020-12-04
郭冰晨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although prefabricated slabs can be prefabricated at the rear of the factory, and then transported to the site for use, it is very convenient and fast, which can effectively reduce construction costs, but the strength of prefabricated slabs is not as good as that of cast-in-place reinforced concrete structures, especially the surface strength is reduced, and it is prone to surface damage. Water seepage and cracking can easily cause the surface to fall off after being subjected to mechanical shock, which seriously affects safety, quality and service life

Method used

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  • Processing method of high-compactness concrete precast slab capable of preventing surface cracking
  • Processing method of high-compactness concrete precast slab capable of preventing surface cracking
  • Processing method of high-compactness concrete precast slab capable of preventing surface cracking

Examples

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Effect test

Embodiment 1

[0044] see Figure 1-4 , a method for processing a high-density concrete prefabricated panel that prevents surface cracking, comprising the following steps:

[0045] S1. Weigh the raw materials and mix them evenly. The raw materials include the following ingredients in parts by weight: 265 parts of Portland cement, 165 parts of water, 725 parts of fine sand, 1000 parts of gravel, 75 parts of mineral powder, and 75 parts of fly ash , 10 parts of polycarboxylate superplasticizer, 5 parts of composite early strength agent, 2 parts of defoamer;

[0046] S2. Apply a layer of release oil to the prefabricated board mold, pour the mixed raw materials into the mold, and vibrate evenly for 10 seconds;

[0047] S3. Evenly put defoaming netting rods 1 into the mold, and apply a uniform magnetic field to force the defoaming netting rods 1 to be evenly distributed in the mold, and close the mold after resting;

[0048] S4. After changing the magnetic field, adsorb and distribute the defoa...

Embodiment 2

[0060] see Figure 1-4 , a method for processing a high-density concrete prefabricated panel that prevents surface cracking, comprising the following steps:

[0061] S1. Weigh the raw materials and mix them evenly. The raw materials include the following components in parts by weight: 268 parts of Portland cement, 168 parts of water, 728 parts of fine sand, 1025 parts of gravel, 80 parts of mineral powder, and 78 parts of fly ash , 15 parts of polycarboxylate superplasticizer, 8 parts of composite early strength agent, 3 parts of defoamer;

[0062] S2. Apply a layer of release oil to the prefabricated board mold, pour the mixed raw materials into the mold, and vibrate evenly for 20 seconds;

[0063] S3. Evenly put defoaming netting rods 1 into the mold, and apply a uniform magnetic field to force the defoaming netting rods 1 to be evenly distributed in the mold, and close the mold after resting;

[0064] S4. After changing the magnetic field, adsorb and distribute the defoam...

Embodiment 3

[0069] see Figure 1-4 , a method for processing a high-density concrete prefabricated panel that prevents surface cracking, comprising the following steps:

[0070] S1. Weigh the raw materials and mix them evenly. The raw materials include the following components in parts by weight: 270 parts of Portland cement, 170 parts of water, 730 parts of fine sand, 1050 parts of gravel, 85 parts of mineral powder, and 80 parts of fly ash , 20 parts of polycarboxylate superplasticizer, 10 parts of composite early strength agent, 5 parts of defoamer;

[0071] S2. Apply a layer of release oil to the prefabricated board mold, pour the mixed raw materials into the mold, and vibrate evenly for 30 seconds;

[0072] S3. Evenly put defoaming netting rods 1 into the mold, and apply a uniform magnetic field to force the defoaming netting rods 1 to be evenly distributed in the mold, and close the mold after resting;

[0073] S4. After changing the magnetic field, adsorb and distribute the defoa...

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Abstract

The invention discloses a processing method of a high-compactness concrete precast slab capable of preventing surface cracking, and belongs to the technical field of concrete precast slabs. Accordingto the processing method, defoaming net-forming rods can be innovatively introduced and are uniformly distributed through a uniform magnetic field before being solidified, then the defoaming net-forming rods are forced to move from the middle of concrete to the surfaces of the two sides, bubbles in the concrete can be effectively eliminated, so that the compactness of the formed concrete is improved, and the air hole defect is greatly improved; after the defoaming net-forming rods are migrated to the surface of the concrete, the splitting action of the defoaming net-forming rods is triggered in a heating mode, so that the defoaming net-forming rods are in contact with the adjacent defoaming net-forming rods and are combined to form a net; and through melting and re-curing of phase change nodes, a high-strength connecting surface is formed, a net-shaped reinforcing structure is formed on the surface of the concrete, and the contraction force is triggered when the temperature is reduced,so that the phenomena of water seepage and cracking of the surface of the concrete are prevented, and the forming strength and the compactness of the concrete are effectively improved.

Description

technical field [0001] The invention relates to the technical field of concrete prefabricated slabs, in particular to a processing method for a high-density concrete prefabricated slab that prevents surface cracking. Background technique [0002] Prefabricated panels are the floor slabs used in the early 20th century buildings, which are the modules or panels used in the project. Because the prefabricated concrete parts are produced and processed in the prefabrication field, and are directly transported to the construction site for installation, they are called prefabricated panels. When making prefabricated panels, first use wooden boards to nail the hollow model, after distributing steel bars in the hollow part of the model, fill the hollow part with cement, knock off the wooden board after it dries, and the rest is the prefabricated board. Prefabricated panels have many uses in construction, such as the cement panels covered on the ditch next to the road; the cement pane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B23/00B28B23/02B28B1/08B28B1/52
CPCB28B1/08B28B1/523B28B23/0081B28B23/02
Inventor 郭冰晨
Owner 郭冰晨
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