WO2015060667A1 - Rapid hardening mortar composition for repairing roads and method for preparing same - Google Patents

Abstract

The present invention provides a rapid hardening mortar composition for repairing roads, which can exhibit an excellent adhesive performance with concrete and maintain good workability, and obtain desired and required strength in a short time. The rapid hardening mortar composition for repairing roads, according to the present invention, comprises: 10-20wt% of phosphate; 3-6wt% of calcium silicate; 15-25wt% of silica fume; 20-60wt% of an inorganic binding material; 5-10wt% of aluminum oxide; and 5-10wt% of magnesium oxide. The aforementioned rapid hardening mortar composition for repairing roads, according to the present invention, enables a road to be repaired in an environmentally-friendly manner since a lime component such as conventional portland cement is not contained, solves a delay problem of the curing time in winter, is economical and has excellent stability by repairing a defective part of the road in a short time since a hardening time is quickly progressed when compared with the conventional portland cement.

Description

Superhard roadway mortar composition and its manufacturing method

The present invention relates to a mortar composition for super-speed road repair, and a method for manufacturing the same, and more particularly, excellent adhesion to existing ground concrete, good workability, and the required strength can be obtained in a short time. The present invention relates to a super speed mirror mortar composition suitable for use in repairing road defects, and a method of manufacturing the same.

Concrete structures are subject to various natural or artificial effects after construction, resulting in deterioration of physical performance due to physical and chemical deformation depending on the years of use. In particular, in recent years, in order to secure safety and performance of construction structures, efforts to restore safety and functional performance have been increased. Accelerating aging of such construction structures causes cross-sectional defects in the structure, ie concrete, due to expansion pressures caused by corrosion, freeze-thawing, carbonation, and so on. This may cause problems.

In addition, when the repair or reinforcement work is carried out in order to improve such a problem, the function of the structure must be stopped due to the need to suspend the work due to the use of the structure during the construction period.

On the other hand, most of the fast or ultra-fast mortar currently used as a repair material is typically mortar based on Portland cement, and various types of mortar have been manufactured and used before. For example, there is a method of preparing mortar by adding CSA (calcium sulfoaluminate) or latex and adding a predetermined fine powder binding material. These conventional per second rigid or in hard mortar is based on the intumescent substance eth- Lin gayiteu generated baneungjeom of obtained by the reaction of most of cement and water, as a main component a CA and CA _2, depending on the configuration mineral expressing in a rigid It can be classified into aluminate-based mortar, calcium fluoroaluminate-based mortar containing C ₁₁ A ₇ ㆍ CaF ₂ as a main component, and sub-type mortar containing CSA as a main component.

However, the aluminate-based mortar has a problem that the product is not stable in the long term as the product is transferred to a secondary hydrate that exhibits low strength after the hydration reaction, and in particular, it is vulnerable to calcium chloride, thereby deteriorating durability. In addition, calcium fluoroaluminate-based and sub-type mortar is relatively superior in performance, but it may not be economical because it requires a separate firing process and a process to be pulverized into fine powder is added.

In addition, the mortar manufactured through the alkali-activated material is mostly fast-speed, not super-fast, and at least one day of strength is required after mixing with water. For example, road repairs in winter, bridge repairs, construction at water contact sites, etc. are difficult to apply.

Therefore, to overcome the problems of strength expression time of mortar, super fast hard mortar is manufactured and used using alumina cement and jet cement developed in the cement industry, but due to the nature of the repair mortar exposed to the external environment, mortar Its use is limited because it is very sensitive to the durability (freezing fusion, carbonation, etc.) and outdoor temperature (dry shrinkage, etc.) related to the quality.

[Preceding technical literature]

[Patent Documents]

(Patent Document 0001) Domestic Registered Patent No. 10-0807850 (registered February 20, 2008)

(Patent Document 0002) Domestic Patent No. 10-0982469 (September 09, 2010 registration)

(Patent Document 0003) Domestic Publication No. 10-1999-0048208 (July 05, 1999 publication)

The present invention is to provide a mortar composition for super-speed roadway repair that can obtain the required strength in a short time while maintaining excellent adhesion to the ground concrete and good workability.

In addition, the present invention is to provide a mortar composition for the super-speed road repair that does not contain a lime component, such as the existing Portland cement can be repaired the road in an environmentally friendly manner, and solve the delay problem of curing time in winter.

In addition, the present invention is to provide a method of manufacturing a mortar composition for super-speed road repairing economical and stable to repair the shortage of the road in a short time because the curing time proceeds faster than the conventional Portland cement.

In addition, the present invention is to provide a method for producing a mortar composition for super-speed roadway repair to improve the injection and transport characteristics of the phosphate cement, to manufacture at low cost, and to adjust the curing time to adjust the desired compressive strength. .

Various problems to be solved by the present invention are not limited to the above-mentioned problems, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

The mortar composition for super-speed road repair according to the present invention, phosphate 10 to 20% by weight, calcium silicate 3 to 6% by weight, silica fume 15 to 25% by weight, inorganic binder 20 to 60% by weight, aluminum oxide 5 to 10% by weight And 5 to 10 weight percent of magnesium oxide.

The phosphate may be used potassium monophosphate.

The silica fume may have a density of 2.0 to 2.2 g / cm ³ and a specific surface area of 150,000 to 200,000 cm ² / g.

The silica fume may be an average particle diameter of 0.2 to 0.5㎛.

The silica fume may be configured in a granular form.

The inorganic binder may be a mixture of fly ash and aggregate.

The aggregate may be one or two or more of bottom ash aggregate, steelmaking slag aggregate, copper smelting slag aggregate and nickel smelting slag aggregate.

The road repair mortar composition may further include a lower silica.

The lower silica has a particle size of 212 μm or less (average particle diameter of 50 μm) and has a range of 30 to 50 wt%, and particles of 212 μm or more may have a range of 50 to 70 wt%.

In addition, according to the present invention, a method for preparing mortar for superhard roadway repair includes mixing 10 to 20% by weight of phosphate and 3 to 6% by weight of calcium silicate with respect to a dry mortar powder composed of 20 to 60% by weight of an inorganic binder. 15-25 wt% of silica fume, 5-10 wt% of magnesium oxide, and 5-10 wt% of aluminum oxide may be mixed using a mixer to prepare a slurry to form a slurry, followed by natural curing.

The natural curing may be a vibratory molding by injecting a mixture of the slurry phase into the molding die, and may be natural curing in the curing machine adjusted to room temperature after demolding.

The cemented carbide road repair mortar may further include lower silica.

The mortar composition for the super fast-speed road repair according to the present invention has an effect of achieving desired strength in a short time while maintaining excellent adhesion with the ground concrete and maintaining good workability.

In addition, the mortar composition for cemented carbide road repair according to the present invention does not contain the same lime component as the conventional portland cement, so that the road can be repaired in an environmentally friendly manner, and there is an effect of solving the problem of delay in curing time in winter. .

In addition, the manufacturing method of the mortar composition for the super-speed road repair according to the present invention, since the curing time proceeds faster than the existing Portland cement, it is possible to repair the shortage of the road in a short time has an excellent economic and stability effect.

In addition, the manufacturing method of the mortar composition for the super fast-paced road repair according to the present invention, improves the spraying and pressure-feeding characteristics of phosphate cement, it is manufactured at low cost, the effect of controlling the desired compressive strength by adjusting the curing time There is.

It will be fully understood that embodiments of the inventive concept may provide various effects not specifically mentioned.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the present invention to those skilled in the art.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, a preferred embodiment of the mortar composition for superscopy road repair according to the present invention will be described in detail.

According to a preferred embodiment of the present invention, the superfine mortar composition for road repair includes 10 to 20 wt% of phosphate, 3 to 6 wt% of calcium silicate, 15 to 25 wt% of silica fume, 20 to 60 wt% of inorganic binder, and 5 to 5 aluminum oxide. 10 weight percent and 5 to 10 weight percent magnesium oxide.

The phosphate may be contained in an amount of 10 to 20% by weight based on the total mortar composition for the super fast-speed road repair. The phosphate has a high level of compressive strength (defined as ultra high strength = 80 Mpa or more) due to the problem that the mixture of the inorganic binder is quenched and hardened before molding when the amount of the phosphate added is less than the range of 10% by weight, and hardening before molding. If the addition amount of the phosphate exceeds 20% by weight range, there is no further improvement in compressive strength, but the cost of the product is excessively increased.

The phosphate used in the present invention is potassium monophosphate, potassium diphosphate, potassium triphosphate, sodium monophosphate, sodium diphosphate, sodium triphosphate, aluminum phosphate, zinc phosphate, ammonium polyphosphate, sodium nucleated metaphosphate, calcium monophosphate , Calcium diphosphate, calcium triphosphate and the like can be used.

When the phosphate is added, it is possible to confirm that the binding time of the binder is extended, and the extended time during the manufacture of the product enables the molding of the product and induces the rearrangement time of the raw materials, thereby suppressing cracking in the product. Done. In addition, it can be seen that the termination termination time is extended in various ways depending on the type of phosphate used, and this advantage can be seen that the applicability can be greatly extended depending on the site.

The calcium silicate may be included in the amount of 3 to 6% by weight based on the total mortar composition for the super speed road repair. The calcium silicate is used to improve the spraying and pumping properties of the phosphate. Mortar formed from the phosphate tends to cure quickly and has excellent chemical stability and compressive strength, but mortar made of phosphate has poor spraying and pumping properties due to its fast cure property. Therefore, the calcium silicate (calcium silicate) by adding 3 to 6% by weight, it is possible to improve the spraying and feeding properties of the mortar prepared by the phosphate.

The silica fume may be included in an amount of 15 to 25% by weight based on the total mortar composition for the ultrafast mirror road repair. The silica fume exerts a high binding force with alkali ions, and can improve the mixing properties between components when pouring mortar. The silica fume is a material concentrated from the gas discharged from the furnace, and contains a large amount of amorphous silicon secondary oxide, and may be very fine spherical particles. In addition, the silica fume may have a density of 2.0 to 2.2 g / cm ³ and ultrafine particles having a specificity of 150,000 to 200,000 cm ² / g. The silica fume may have an average particle diameter of 0.2 to 0.5 μm, and may be ultrafine particles having an average particle diameter of 0.2 μm, which is advantageous in terms of a highly reactive mortar material. The silica fume type may be in its original form as powder (as-produced), sludge suspended in water, pelletized, densified or compacted, etc., preferably It may be granular in consideration of workability and workability with other powders. The silica fume may be included in the 15 to 25% by weight, if the silica fume is included in the above range may provide the appropriate viscosity, mixing and workability when pouring mortar.

The inorganic binder may be included in 20 to 60% by weight. The inorganic binder is a mixture of fly ash aggregate, the aggregate may be one or two or more of the bottom ash aggregate, steelmaking slag aggregate, copper smelting slag aggregate and nickel smelting slag aggregate. In recent years, there have been serious problems in the treatment of wastes such as fly ash, bottom ash, urban waste incineration, aggregate ash and blast furnace slag generated in thermal power plants. Although 15-30% is used as a mixed material in the composition, the amount of use is drastically reduced in the winter due to delay of curing time. Lightweight aggregate manufactured using fly ash is produced by adding a clay, a reducing agent, a foaming agent, and the like to the fly ash and then firing it, but the current situation is hardly produced due to an increase in manufacturing cost. In addition, the generation of fly ash is increasing with the expansion of thermal power plants due to the increase in power consumption, and about 10 million tons are expected to be generated annually.

In addition, aggregates used in concrete compositions have been collected and used in rivers or rivers in the meantime, but these natural aggregates are also depleted to develop quarries and use crushed aggregates, and the development of quarries has also reached its limit.

Therefore, in the present invention, the inorganic binder is used to mix the fly ash aggregate, the aggregate may be one or two or more of the bottom ash aggregate, steelmaking slag aggregate, copper smelting slag aggregate and nickel smelting slag aggregate.

The bottom ash can be used by sieving the state that is discarded by grinding in a coal-fired power plant as it is to a certain particle size.

The steelmaking slag is divided into an electric furnace slag generated when smelting scrap metal and a converter slag generated in the process of making molten steel. Furnace slag is further classified into electric furnace oxidizing slag generated in the primary oxidation refining plant and reducing slag generated in the casting process after the secondary reduction refining. The reducing slag has a high content of free CaO and MgO, which are expandable materials, and is difficult to use as aggregate. However, Electric Arc Furnace Oxidizing Slag containing relatively less free CaO is used as fine aggregate in the composition for concrete of the present invention under the system that no reducing slag is incorporated.

The copper smelting slag is a slag generated in the copper smelting process, and the main component is iron olivine (fayalite) (2FeOSiO ₂ ), and also includes metal oxides such as CaO, MgO, and Al ₂ O ₃ .

The nickel smelting slag is a slag generated in a ferronickel smelter and is a silicate material of magnesium and iron and is composed of metal oxides such as MgO, Fe ₂ O ₃ , and SiO ₂ .

Ultrasonic mirror road repair mortar composition according to the present invention may further comprise a lower silica. The lower silica may be contained 15 to 25% by weight based on the total weight of the inorganic binder. The lower silica may be utilized for the lower silica that is disposed of or disposed of around the mine, or cover. Lower quartzite is produced from the blasting process and the crushing process to dig the silica, and the particle size is 212㎛ or less (average particle size 50㎛) and has a range of 30 to 50% by weight, and the particles larger than 212㎛ 50 ~ 70 It is preferred to have a range of weight percent. If the silica particles are out of the range, the initial strength is low, and even if the age period is extended, it is difficult to obtain more than expected physical properties. The main chemical composition of the lower silica used in the present invention is SiO ₂ (79.2% by weight) + Al ₂ O ₃ (13.3% by weight) is composed of 92.5% by weight, as a minor component Fe ₂ O ₃ , MgO, Na ₂ O And other ingredients may include 7.5 weight percent.

The aluminum oxide may be included in 5 to 10% by weight. The aluminum oxide can be used to cure the mortar for road repair according to the invention very quickly. The aluminum oxide has a short curing time and is strong in water. In addition, the aluminum oxide protects the mortar coating, the internal reinforcing bars, etc. by the coating, and the aluminum oxide coating blocks the penetration of air to exert strong corrosion resistance and water resistance.

The magnesium oxide may be included in 5 to 10% by weight. The magnesium oxide is to determine the reaction rate, the reaction rate is controlled due to the magnesium oxide, it is possible to suppress the generation of severe heat during the production of mortar for road repair.

Hereinafter, a method for preparing a mortar composition for a super speed mirror road repair according to the present invention will be described.

First, 20 to 60% by weight of the inorganic binder is dry mixed in a ball mill, speed mill, mortar mixer, or the like. The inorganic binder is a mixture of fly ash aggregate, the aggregate may be one or two or more of the bottom ash aggregate, steelmaking slag aggregate, copper smelting slag aggregate and nickel smelting slag aggregate.

Next, to the inorganic binder dry mortar powder, 10 to 20% by weight of phosphate and 3 to 6% by weight of calcium silicate are added at a fixed ratio with respect to the total weight of the mortar composition for ultra-high speed road repair. As the phosphate, potassium monophosphate, potassium diphosphate, potassium triphosphate, sodium monophosphate, sodium diphosphate, sodium triphosphate, aluminum phosphate, zinc phosphate, ammonium polyphosphate, sodium nucleated metaphosphate, calcium monophosphate, calcium diphosphate , Calcium triphosphate, and the like can be used, and preferably potassium monophosphate can be used. The calcium silicate may be added to improve the injection and transport characteristics of the phosphate.

Next, using a mortar mixer, 15 to 25% by weight of silica fume, 5 to 10% by weight of magnesium oxide and 5 to 10% by weight of aluminum oxide are wet mixed to prepare a slurry. The silica fume may be ultrafine particles having a density of 2.0 to 2.2 g / cm ³ and specific surface area of 150,000 to 200,000 cm ² / g, and have an average particle diameter of 0.2 to 0.5 μm.

Subsequently, the slurry prepared using the mortar mixer as described above is vibrated using a vibration molding machine, and is molded without adding any external force other than vibration.

The molded article obtained by the present invention is produced by natural curing in a curing machine adjusted to room temperature (25 ° C) after demolding.

In particular, the high-strength super-speed roadway repair mortar using phosphate, calcium silicate, silica fume, inorganic binder, aluminum oxide and magnesium oxide produced by the present invention is a significant improvement of the existing molding and curing process to be produced only by natural curing. There are features that can be.

Hereinafter, a preferred embodiment of the method for preparing a mortar composition for supersonic road repair according to the present invention will be described.

<Example>

50 wt% of the inorganic binder was dry mixed using a mortar mixer. As the inorganic binder used in the present invention, the fly ash and the bottom ash aggregate were used, and the fly ash and the bottom ash aggregate were mixed to be 1: 1 in weight ratio. After dry mixing the inorganic binder, 15% by weight of phosphate and 6% by weight of calcium silicate were added to the total weight of the mortar composition for ultra-fast road repair, and potassium monophosphate was used as the phosphate.

Subsequently, 15% by weight of silica fume, 7% by weight of magnesium oxide, and 7% by weight of aluminum oxide were mixed using a mortar mixer to prepare a slurry, and vibration molding was performed in a vibration molding machine.

The molded specimen was cured for a certain time by natural curing, and then cured at room temperature to prepare a mortar composition for ultra-fast road repair.

The physical properties of the cemented carbide for road repair mortar prepared by the above example were examined by KS F-4042: 2007 test method, and the results are shown in the following [Table 1].

Table 1

Test Items		Test result	Test Methods
Flexural strength (N / ㎡)	3 hours	3.8	KS F-4042: 2007
	1 day	8.7
	3 days	11.4
	7 days	14.2
	28 days	15.7
Compressive strength (N / ㎡)	3 hours	11.2
	1 day	33.0
	3 days	48.7
	7 days	59.7
	28 days	69.2
Bond strength (N / mm2)	Standard condition	2.1
	After hot and cold repeat	1.9
Alkali resistance (N / mm2)		62.7
Neutralization Resistance (mm)		1.6
Permeability (g)		5.2
Water Absorption Coefficient (kg / ㎡ · h 0.5 )		0.27
Moisture penetration resistance (m)		1.5
Chloride ion penetration resistance (coulombs)		812
Length change rate (%)		-0.11

As shown in [Table 1], the mortar composition for the super speed mirror road repair according to the present invention has been confirmed that the compressive strength is 11.2N / mm 2 and the daily compressive strength is 33.0N / mm 2, the super-speed and super-tension strength It is expected to be preferably used as an emergency road repair mortar. In addition, it shows excellent performance in flexural strength, adhesion strength, alkali resistance, neutralization resistance, and chloride ion penetration resistance. Especially, the length change rate is -0.3 ~ 0.3% as the length change rate is -0.11%. It can be seen that the stability is greater than that of the general mortar. Therefore, the present invention is expected to be advantageous in durability when applied as an emergency road repair mortar.

As mentioned above, although one preferred embodiment of the present invention has been described, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Could be. Therefore, it should be understood that one embodiment described above is illustrative in all respects and not restrictive.

Claims (10)

1. 10 to 20% by weight of phosphate, 3 to 6% by weight of calcium silicate, 15 to 25% by weight of silica fume, 20 to 60% by weight of inorganic binder, 5 to 10% by weight of aluminum oxide and 5 to 10% by weight of magnesium oxide Ultrasonic mirror road repair mortar composition.
2. The method of claim 1,

   The phosphate is potassium monophosphate, super speed mirror mortar composition for road repair.
3. The method of claim 1,

   The silica fume has a density of 2.0 to 2.2 g / cm ³ , and the specific surface area 150,000 to 200,000 cm ² / g of the mortar composition for the super speed mirror road repair, characterized in that it has a powder.
4. The method of claim 3, wherein

   The silica fume mortar composition for an ultra-fast diameter road repair, characterized in that the average particle diameter of 0.2 to 0.5㎛.
5. The method of claim 1,

   The inorganic binder is mortar composition for the super fast-paced road repair, characterized in that the mixture of fly ash and aggregate.
6. The method of claim 5,

   The aggregate is mortar composition for the super-speed road repair, characterized in that the bottom ash aggregate, steelmaking slag aggregate, copper smelting slag aggregate and nickel smelting slag aggregate or one or more aggregates.
7. The method of claim 1,

   The mortar composition for road repair mortar composition for a super fast-paced road repair, characterized in that it further comprises a lower silica.
8. The method of claim 7, wherein

   The lower silica has a particle size of 212 μm or less (average particle diameter of 50 μm) and has a range of 30 to 50% by weight, and particles having a diameter of 212 μm or more have a range of 50 to 70% by weight. Mortar composition for repair.
9. 10 to 20% by weight of phosphate and 3 to 6% by weight of calcium silicate are mixed with a dry mortar powder composed of 20 to 60% by weight of an inorganic binder, and 15 to 25% by weight of silica fume and 5 to 10% by weight of magnesium oxide using a mortar mixer. % And 5 to 10% by weight of aluminum oxide is prepared in the form of a slurry by vibrating molding, the method of manufacturing a super fast-speed road repair mortar, characterized in that the natural curing.
10. The method of claim 9,

    The natural curing is a method for producing mortar for super speed mirror repair, characterized in that the injection of the mixture of the slurry phase to the molding mold and vibrating, and natural curing in the curing machine adjusted to room temperature after demolding.