WO2016167452A1

WO2016167452A1 - Powder waterproofing admixture, method for preparing same, and construction method using same

Info

Publication number: WO2016167452A1
Application number: PCT/KR2016/000762
Authority: WO
Inventors: 임명수; 김명지
Original assignee: (주)피엠씨
Priority date: 2015-04-16
Filing date: 2016-01-25
Publication date: 2016-10-20
Also published as: KR101550220B1

Abstract

A powder waterproofing admixture of the present invention contains 100 parts by weight of zinc stearate, 10-20 parts by weight of silica fume, 10-15 parts by weight of active silica, 30-40 parts by weight of diatomite, 1-2 parts by weight of sodium lauryl sulfate, 1-2 parts by weight of sodium benzoate, 1-3 parts by weight of hydrogel particles and 1-2 parts by weight of a surfactant. Further, the powder waterproofing admixture of the present invention may further contain pyrobitumen particles, wherein the amount of added pyrobitumen particles is preferably 0.5-1 wt% for the entire powder waterproofing admixture.

Description

Powder specific waterproofing agent, preparation method thereof and construction method using same

The present invention relates to a powder type concrete waterproofing agent, and more particularly, to a powder concrete waterproofing agent that can impart waterproofness to a concrete structure itself by mixing concrete and pouring concrete, and a manufacturing method thereof and a construction method using the same.

Concrete is composed of aggregates such as water, cement, sand and gravel, and is used to form building structures such as buildings, bridges, and tunnels by using a hydration reaction in which cement and water react and harden.

The concrete structure is divided into the underground layer buried in the ground, the surface layer exposed to the air, the basement layer is always in contact with the moisture and the durability can be reduced as the contraction and expansion repeated with the change of temperature. The degradation of durability of concrete is especially affected by water, water acts as a medium to deteriorate concrete, and dissolved sulfates, nitrates, carbonates and acid rain can accelerate the damage of concrete structures.

In the hydration reaction, a process of hardening concrete, it is inevitable that voids are formed in the concrete, which is a path through which moisture penetrates the concrete structure. If moisture penetrates through the internal pores, it may generate microcracks, which may deteriorate the waterproof performance of the concrete and at the same time significantly affect the life of the concrete structure while corroding the rebar.

Methods of providing waterproofness to concrete include a method of forming a waterproof film on the surface of the concrete, a method of infiltrating the waterproofing agent to a certain depth, and a method of preventing voids and cracks inside the concrete, as in the third case. The method of giving is called concrete waterproofing. Concrete waterproofing is implemented by reducing the mixing amount of water to suppress the generation of internal voids, filling the internal voids into fine particles, a method of mixing the water repellent material to prevent the internal penetration of moisture and the like.

Korean Patent No. 655260 is a prior art document relating to powder type concrete waterproofing agent for concrete. The prior art documents include tuff, volcanic ash, and perlite, and include 10 to 60 wt% of natural inorganic minerals including amorphous silica, philipsite, and sodium calcium aluminum silicate in constituent minerals. A spherical waterproofing material comprising 10 to 30% by weight of silica fume, 10 to 40% by weight of fly ash or blast furnace slag fine powder, and 5 to 25% by weight of sulfate is disclosed. However, the specific waterproofing agent disclosed in the above-mentioned prior document has only a waterproofing effect by inorganic particles, and thus has a limitation in improving the waterproofing performance. Therefore, there is a great need to develop a new powder sphere waterproofing agent having excellent workability while exhibiting waterproof performance by various mechanisms.

Therefore, the first problem to be solved by the present invention is to provide a powder specific waterproofing agent with improved workability while the waterproof performance by various mechanisms.

The second problem to be solved by the present invention is to provide a method for producing the powder specific waterproofing agent.

The present invention, in order to achieve the first object, 100 parts by weight of zinc stearate, 10 to 20 parts by weight of silica fume, 10 to 15 parts by weight of activated silica, 30 to 40 parts by weight of diatomaceous earth, 1 to 2 parts by weight of sodium lauryl sulfate It provides a powder specific waterproofing agent comprising 1 to 2 parts by weight of sodium benzoate, 1 to 3 parts by weight of hydrogel particles and 1 to 2 parts by weight of surfactant.

According to one embodiment of the present invention, the powder specific waterproofing agent may further include 0.5 to 1% by weight of pyro bitumen particles.

In order to achieve the second object of the present invention, 100 parts by weight of zinc stearate, 10 to 20 parts by weight of silica fume, 10 to 15 parts by weight of activated silica, 30 to 40 parts by weight of diatomaceous earth, and 1 to 2 parts by weight of sodium lauryl sulfate , 1 to 2 parts by weight of sodium benzoate, 1 to 3 parts by weight of hydrogel particles, and 1 to 2 parts by weight of surfactant, and fatigue bitumen are pulverized to a particle size range of 10 to 50 microns to form fatigue bitumen particles. A method for producing a powdery concrete waterproofing agent comprising a second step of preparing and a third step of mixing the mixture prepared in the first step and the fatigue bitumen particles prepared in the second step in a weight ratio of 99.5: 0.5 to 99: 1. To provide.

The powder specific waterproofing agent of the present invention and its preparation method have the following effects.

1. As the fatty acid metal salt such as zinc stearate gives water repellency inside the concrete, the waterproof performance of the concrete is improved.

2. Inorganic particles such as silica fume, activated silica and diatomaceous earth fill the pores of concrete to make the concrete internal structure more dense. In particular, inorganic particles of different diameters can be used to improve the water tightness of concrete.

3. Fatigue bitumen particles are composed of hydrocarbons, have high water repellency, and are composed of fine hydrophobic particles of several tens of microns in size, ready-mixed concrete or mortar. To improve the compactness of the concrete and mortar to fill the internal pores of the mortar can further improve the waterproofness of the concrete or mortar.

4. Since the hydrogel particles are contained in the specific waterproofing agent, the penetration of water into the water can effectively prevent the penetration of water to further depth by the expansion action of the hydrogel particles.

5. Since the air entraining agent is included as a component of the concrete waterproofing agent, it is possible to further improve the watertightness since the mixing ratio of water can be reduced while improving workability.

6. Corrosion inhibitor is included to prevent corrosion of rebar.

Powder specific waterproofing agent of the present invention 100 parts by weight of zinc stearate, 10 to 20 parts by weight of silica fume, 10 to 15 parts by weight of activated silica, 30 to 40 parts by weight of diatomaceous earth, 1 to 2 parts by weight of sodium lauryl sulfate, sodium benzoate 1 To 2 parts by weight, 1 to 3 parts by weight of hydrogel particles and 1 to 2 parts by weight of surfactant.

Concrete waterproofing agent is a concrete waterproofing agent used by mixing in the ready-mixed concrete composition. Powder specific waterproofing agent contains various components for waterproofing, and is easier to store and handle than liquid specific waterproofing agent.

The specific waterproofing agent of the present invention includes fatty acid salts, inorganic particles, fatigue bitumen particles, air entrainers, corrosion inhibitors and hydrogel particles.

The fatty acid salt is a water repellent component, which imparts water repellency to the concrete and improves the water tightness of the concrete. The fatty acid salt may be an oleic acid salt or a stearic acid salt, and specifically, calcium oleate, aluminum oleate, zinc stearate, calcium stearate, ammonium stearate, or the like may be used.

Inorganic particles are included in the concrete structure to fill the internal voids generated by the hydration reaction. The inorganic particles may be silica fume, activated silica, or diatomaceous earth, and silica fume, activated silica and diatomaceous earth are preferably different in diameter, and silica fume is preferably larger in diameter than active silica and diatomaceous earth. Mixing inorganic particles of different diameters is more advantageous for filling voids of various sizes. The diameter of the silica fume is preferably in the range of 50 to 300 microns, and the diameters of the active silica and the diatomaceous earth are preferably in the range of 10 to 50 microns.

The air entrainer serves to control the viscosity of the concrete mixture by generating fine bubbles. Specifically, sodium lauryl sulfate may be used. When the air entrainer is mixed with the ready-mixed concrete, the viscosity of the ready-mixed concrete can be adjusted to reduce the amount of water added and workability can be ensured.

Corrosion inhibitors function to prevent corrosion of reinforcing bars in concrete, and specifically, sodium benzoate may be used. The surfactant helps the components of the specific waterproofing agent to be well dispersed in the ready-mixed concrete, and alkyl benzene sulfonate may be used as the surfactant.

The hydrogel particles are polymer resin particles having the property of absorbing and expanding water, and specifically, may be poly-2-hydroxyethylmethacrylate (PHEMA). Hydrogel particles are dispersed inside the concrete structure, and when water penetrates from the surface, it expands while absorbing moisture. Hydrogel particles located in the concrete interior voids function to fill the voids as they expand and prevent moisture from penetrating further into the interior. Hydrogel particles basically have the property of absorbing and expanding moisture, but depending on the concentration of the salt contained in the moisture, the absorbed moisture may be discharged to the outside. Since there are many kinds of salts in the concrete composition, ready-mixed concrete is present in a state in which the hydrogel particles are not expanded in a state where the hydrogel particles are present in the concrete composition. Hydrogel, which was dispersed in the state where the concrete was cured, absorbs moisture in the state where groundwater and rainwater infiltrate from the outside, and fills the pores, thereby preventing water from penetrating anymore. The diameter of the hydrogel particles is preferably 5 to 20 microns. If the diameter of the hydrogel particles is less than 5 microns, manufacturing is difficult, and if it exceeds 20 microns, dispersion becomes difficult.

Pyrobitumen is a solid hydrocarbon-based material, which is infusible and insoluble, unlike bitumen. Fatigue bitumen is divided into asphalt-based and non-salt based asphalt. Asphalt-based fatigue bitumen is derived from petroleum, and non-salt bitumen-based bitumen is derived from minerals. Fatigue bitumen is made of hydrocarbon, so the surface is hydrophobic, so it is filled in concrete to impart water repellency to the concrete, and can be pulverized into small particles, so it can also function to fill voids in the concrete. The pyro bitumen particles preferably have a particle size of 10 to 50 microns. It is difficult to pulverize below 10 microns, and above 50 microns is difficult to disperse in ready mixed concrete or mortar. The reason why fatigue bitumen particles improve the waterproofing properties of concrete or mortar is as follows. Firstly, the bitumen particles consist of hydrocarbons and therefore have a hydrophobic surface, preventing the penetration of moisture into the concrete or mortar to further depth. Secondly, since the bitumen particles are fine hydrophobic particles having a particle size of 10 to 50 microns, the compactness of concrete or mortar is improved by the action of ball bearings in these compositions during mixing or pouring ready mixed concrete or mortar. Thirdly, the bitumen particles fill the fine internal voids generated during the curing of concrete or mortar.

Fatty acid salts, inorganic particles, air entrainers, corrosion inhibitors, and hydrogel particles which are components of the powdered spherical waterproofing agent of the present invention are preferably mixed in a range of component ratios. Specifically, the powder specific waterproofing agent is 100 parts by weight of zinc stearate, 10 to 20 parts by weight of silica fume, 10 to 15 parts by weight of activated silica, 30 to 40 parts by weight of diatomaceous earth, 1 to 2 parts by weight of sodium lauryl sulfate, and 1 to 2 parts of sodium benzoate. 2 parts by weight, 1 to 3 parts by weight of the hydrogel particles and 1 to 2 parts by weight of the surfactant may be mixed.

In addition, the powder specific waterproofing agent may further include 0.5 to 1% by weight of the bituminous bitumen particles of the total powder specific waterproofing agent mixed in the above ratio. If the amount of the bitumen particles is less than 0.5% by weight, the water repelling effect by the bitumen particles may be low and the waterproof effect may be insufficient. If the content is more than 1% by weight, the strength of the concrete may be reduced.

The manufacturing step of the powdery spherical waterproofing agent of the present invention is the first step of mixing fatty acid salts, inorganic particles, air entraining agent, corrosion inhibitor, hydrogel particles, the mixture of the second step and the first step of producing the bitumen particles and the fatigue This may take place in a third step of mixing the bitumen particles. In the first step, 100 parts by weight of zinc stearate, 10 to 20 parts by weight of silica fume, 10 to 15 parts by weight of activated silica, 30 to 40 parts by weight of diatomaceous earth, 1 to 2 parts by weight of sodium lauryl sulfate, and 1 to 2 parts by weight of sodium benzoate Parts, 1 to 3 parts by weight of hydrogel particles and 1 to 2 parts by weight of surfactant are mixed at room temperature. Subsequently, in the second step, the fatigue bitumen mass is pulverized with a ball mill grinder to produce fatigue bitumen particles having an average particle size of 10 to 50 microns. Finally, in the third step, the mixture prepared in the first step and the fatigue bitumen particles are mixed at room temperature in a weight ratio of 99.5: 0.5 to 99: 1.

Powder spherical waterproofing agent prepared by the above method, including fatty acid salts, inorganic filler particles, fatigue bitumen particles, hydrogel particles, etc., can be mixed with concrete or mortar composition to produce concrete or mortar having high water resistance. Such powdered spherical waterproofing agent should be mixed with ready mixed concrete or mortar before pouring, and may be mixed with ready mixed concrete or mortar in a field mixing method or a factory mixing method. On-site mixing is a method of mixing directly by mixing in a mix truck, based on a mix of ready mixed concrete or mortar in the amount of 9 to 12 kg (300 kg of cement per ready mix concrete or mortar) ) Put the powder concrete waterproofing agent inside the mix truck and mix it evenly while rotating at high speed for at least 3 minutes. The plant mix is a method of mixing a powder concrete waterproofing agent in a batcher plant, which is a facility for producing a large amount of ready mixed concrete or mortar, in an amount of 9 to 12 kg per 1 serving of ready mixed concrete or mortar (ready mixed concrete or Based on 300 kg of cement mixed per mortar per mortar).

Hereinafter, the present invention will be described in more detail using examples and evaluation examples.

Example 1 (Preparation of Powder Concrete Waterproofing Agent)

First, 100 g of zinc stearate, 15 g of silica fume, 12 g of activated silica, 35 g of diatomaceous earth, 1.5 g of sodium lauryl sulfate, 1.5 g of sodium benzoate, 2 g of poly-2-hydroxyethyl methacrylate particles (average diameter: 10 microns), and 1.5 g of the surfactant was mixed to prepare a powder spherical waterproofing agent.

Example 2 (Preparation of Powder Concrete Waterproofing Agent)

The fatigue bitumen lumps (yellow coal mine mining) were pulverized with a ball mill grinder to produce fatigue bitumen particles having an average particle size of 30 microns. Subsequently, the powder spherical waterproofing agent prepared in Example 1 and the fatigue bitumen particles were mixed at room temperature in a weight ratio of 99.3: 0.7.

Example 1-1 (Preparation of Concrete Composition)

In order to measure the strength, absorption ratio, and permeability ratio of the concrete composition, the powdered concrete waterproofing liquid prepared according to Example 1 was added to the mortar mixed with 1000 parts by weight of Portland cement, 2450 parts by weight of sand, and 500 parts by weight of water. It was added at 3.5% by weight, and stirred at room temperature for 5 minutes to prepare a mortar composition.

Example 2-1 (Preparation of Concrete Composition)

In order to measure the strength, absorption ratio, and permeability ratio of the concrete composition, the powdered concrete waterproofing liquid prepared according to Example 2 was added to the mortar mixed with 1000 parts by weight of Portland cement, 2450 parts by weight of sand, and 500 parts by weight of water. 3.0 wt% was added, and stirred at room temperature for 5 minutes to prepare a mortar composition.

Example 2-2 (Preparation of Concrete Composition)

In order to measure the strength, absorption ratio, and permeability ratio of the concrete composition, the powdered concrete waterproofing liquid prepared according to Example 2 was added to the mortar mixed with 1000 parts by weight of Portland cement, 2450 parts by weight of sand, and 500 parts by weight of water. It was added at 3.5% by weight, and stirred at room temperature for 5 minutes to prepare a mortar composition.

Example 2-3 (Preparation of Concrete Composition)

In order to measure the strength, absorption ratio, and permeability ratio of the concrete composition, the powdered concrete waterproofing liquid prepared according to Example 2 was added to the mortar mixed with 1000 parts by weight of Portland cement, 2450 parts by weight of sand, and 500 parts by weight of water. 4.0 wt% was added and stirred at room temperature for 5 minutes to prepare a mortar composition.

Comparative Example (Preparation of Concrete Composition)

In order to measure the strength, absorption ratio, and permeability ratio of the concrete composition, the mortar composition was prepared by stirring for 5 minutes in the same manner as in Example 2-1, except that no powder concrete waterproofing solution was added.

Table 1 below summarizes the composition ratio of the concrete composition prepared according to Examples 1-1 to Comparative Examples.

TABLE 1

Evaluation example (evaluation of compressive strength and waterproof performance)

Using the mortar compositions of Examples and Comparative Examples, the compressive strength ratio, absorption ratio, and permeability ratio were measured according to the evaluation methods defined in KS F 2405 and KS F 4926, respectively.

Table 2 below summarizes the evaluation results. The results of the examples were confirmed that the absorption ratio and permeability ratio is superior to the comparative example, in particular in Example 2-1, Example 2-2, Example 2-3 was excellent in the absorption ratio and permeability ratio.

TABLE 2

The above description has been made using the embodiments of the technical idea of the present invention, and those skilled in the art to which the present invention pertains various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments described in the present invention are not intended to limit the technical spirit of the present invention but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims

100 parts by weight of zinc stearate, 10 to 20 parts by weight of silica fume, 10 to 15 parts by weight of activated silica, 30 to 40 parts by weight of diatomaceous earth, 1 to 2 parts by weight of sodium lauryl sulfate, 1 to 2 parts by weight of sodium benzoate, hydrogel Powder spherical waterproofing agent comprising 1 to 3 parts by weight of particles and 1 to 2 parts by weight of surfactant.
The method of claim 1,

Powder spherical waterproofing agent, characterized in that it further comprises 0.5 to 1% by weight of the pyro bitumen particles of the whole powder specific waterproofing agent.
100 parts by weight of zinc stearate, 10 to 20 parts by weight of silica fume, 10 to 15 parts by weight of activated silica, 30 to 40 parts by weight of diatomaceous earth, 1 to 2 parts by weight of sodium lauryl sulfate, 1 to 2 parts by weight of sodium benzoate, hydrogel A first step of mixing 1 to 3 parts by weight of the particles and 1 to 2 parts by weight of the surfactant;

A second step of preparing fatigue bitumen particles by grinding the fatigue bitumen into a particle size range of 10 to 50 microns;

And a third step of mixing the mixture prepared in the first step and the fatigue bitumen particles prepared in the second step in a weight ratio of 99.5: 0.5 to 99: 1.