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Concrete reinforced water-retaining internal curing material and preparation method thereof

A technology of concrete and cross-linked materials, which is applied in the field of concrete reinforced water-retaining internal curing materials and its preparation, which can solve the problems of reducing the compactness and strength of concrete, and the limited internal curing effect, so as to ensure the degree and strength of the closed room and reduce the later maintenance Low cost and excellent water retention performance

Inactive Publication Date: 2015-06-03
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the internal curing effect of this kind of material is limited, and it is easy to release water inside the concrete to leave pores, thereby reducing the compactness and strength of concrete, which limits the application of this material to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Weigh 100g of acrylic acid, 40g of acrylamide, 30g of finely ground zeolite powder, 20g of activated coal gangue powder, 0.05g of N,N-methylenebisacrylamide, and 1g of potassium persulfate in an airtight container and stir evenly ;

[0019] 2) Put the above materials into a container, then dropwise add NaOH solution with a concentration of 30% and stir evenly until the neutralization degree is 60%, to prepare a solid cross-linked product;

[0020] 3) get 82g solid cross-linked product, 5g particle diameter is 40 microns, the fly ash microbead that calcium oxide content is 10%, 4g particle diameter is 55 nanometers, the silicon dioxide particle that pH value is 6.5, 3g phosphogypsum, 3g of natural alunite, 2g of magnesia, and 1g of calcium oxide were put into a ball mill and crushed to a particle size of 0.01mm to obtain a concrete-enhanced water-retaining internal maintenance material.

[0021] When in use, directly add the concrete-enhanced water-retaining internal...

Embodiment 2

[0023] 1) Weigh 100g of acrylic acid, 40g of acrylamide, 30g of finely ground zeolite powder, 20g of activated coal gangue powder, 0.05g of N,N-methylenebisacrylamide, and 1g of potassium persulfate in an airtight container and stir evenly ;

[0024] 2) Put the above materials into a container, then dropwise add NaOH solution with a concentration of 30% and stir evenly until the neutralization degree is 60%, to prepare a solid cross-linked product;

[0025] 3) get 82g solid cross-linked product, 5g particle diameter is 30 microns, the fly ash microbead that calcium oxide content is 15%, 4g particle diameter is 40 nanometers, the silicon dioxide particle that pH value is 5.2, 3g phosphogypsum, 3g of natural alunite, 2g of magnesia, and 1g of calcium oxide were put into a ball mill and crushed to a particle size of 0.1mm to obtain a concrete-enhanced water-retaining internal maintenance material.

[0026] When in use, directly add the concrete-enhanced water-retaining internal ...

Embodiment 3

[0028] 1) Weigh 100g of acrylic acid, 40g of acrylamide, 30g of finely ground zeolite powder, 20g of activated coal gangue powder, 0.05g of N,N-methylenebisacrylamide, and 1g of potassium persulfate in an airtight container and stir evenly ;

[0029] 2) Put the above materials into a container, then dropwise add NaOH solution with a concentration of 30% and stir evenly until the neutralization degree is 60%, to prepare a solid cross-linked product;

[0030] 3) get 82g solid cross-linked product, 5g particle diameter is 30 microns, the fly ash microbead that calcium oxide content is 10%, 4g particle diameter is 30 nanometers, the silicon dioxide particle that pH value is 6, 3g phosphogypsum, 3g of natural alunite, 2g of magnesia, and 1g of calcium oxide were put into a ball mill and crushed to a particle size of 0.15mm to obtain a concrete-enhanced water-retaining internal maintenance material.

[0031] When in use, directly add the concrete-enhanced water-retaining internal m...

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Abstract

The invention discloses a concrete reinforced water-retaining internal curing material and a preparation method thereof. The method comprises the following steps: respectively weighing the following components in parts by weight: 10 parts of acrylic acid, 4 parts of acrylamide, 3 parts of ground zeolite powder, 2 parts of activated coal gangue powder, 0.005 part of N,N-methylene bisacrylamide and 0.1 part of potassium persulfate, adding the components into a container, uniformly stirring, dropwise adding a NaOH solution, uniformly stirring until the neutralization degree is 60 percent, reacting for 10 hours, and drying, thereby obtaining a solid cross-linking agent; weighing the solid cross-linking agent, coal ash beads, silica colloidal particles, phosphorus gypsum, natural alunite, magnesium oxide and calcium oxide according to the weight ratio of 82:5:4:3:3:2:1, adding the mixture into a ball mill, and grinding, thereby obtaining the concrete reinforced water-retaining internal curing material. The concrete reinforced water-retaining internal curing material disclosed by the invention is excellent in water retention capacity, pores reserved by water release inside concrete filled with the traditional internal curing material can be canceled, the compaction rate and strength of the concrete are guaranteed, the later maintenance cost is greatly reduced, the self-shrinkage within 28 days is reduced by 50-80 percent compared with that of common concrete, and the compressive strength is improved by 5-10 percent.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a concrete reinforced water-retaining internal maintenance material and a preparation method thereof. Background technique [0002] Modern concrete is mostly designed with a low water-binder ratio and uses a large amount of ultra-fine mineral admixtures and high-efficiency admixtures. Its early autogenous shrinkage is large and it is easy to develop into cracks when it is restrained, resulting in structural cracking and damage. Internal curing technology (Internal curing) is currently a research hotspot in inhibiting early shrinkage cracking of high-strength and high-performance concrete. Internal curing is also called self-curing, which refers to a method that relies on preset water-absorbing materials to release water in a timely manner to maintain sufficient moisture inside the concrete. It inhibits autogenous shrinkage by compensating the water consumption inside...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B22/14C04B22/06
Inventor 何锐刘开平陈华鑫关博文盛燕萍邢明亮
Owner CHANGAN UNIV
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