KR101156460B1 - This construction method using mortar and elastic - Google Patents

Abstract

PURPOSE: A construction method using elastic mortar and elastic mortar are provided to improve mobility, inside stiffness, shock resistance, abrasion resistance, and cohesive property by including optimum amount of elastic mixture, elastic mixture, hardening mixture, and reinforcing mixture. CONSTITUTION: A construction method using elastic mortar comprises the following steps: removing deficit parts around a gap portion; shotblasting the deficit removed site; removing foreign materials by using an air blooming; maintaining the foreign material removed site as wet; spreading epoxy based primer on the wet surface; filling the elastic mortar in the gap portion; and curing the eastic mortar. The elastic mortar comprises 5-10 weight% of elastic mixture, 10-30 weight% of hardening mixture, and 60-80 weight% of enforcement mixture. The elastic mixture additionally includes 33.5-42.1 weight% of polyol, 12-15 weight% of amine compound, 31.5-33.8 weight% of calcium carbonate, 0.1-0.4 weight% of lead compound, 2-6 weight% of carbon black, 0.5-1.5 weight% of antifoaming agent, and 8-11 weight% of plasticizer.

Description

Elastic mortar and construction method using the same {This construction method using mortar and elastic}

The present invention relates to an elastic mortar for fixing a connecting device used for joints such as bridges, overpasses, and construction methods using the same.

More specifically, the present invention relates to an elastic mortar having excellent flowability and fastness, but excellent impact resistance and abrasion resistance, and a construction method using the same.

In general, in an overpass or a road bridge such as a highway, expansion equipment is installed at every predetermined distance to cope with stress caused by stretching or vibration caused by temperature changes.

Conventionally, mortar using fast cement or mortar using concrete, magnesia and phosphate cement, epoxy resin mortar, asphalt mortar and the like have been used for fixing the expansion and contraction device.

However, such a fixed material such as mortar or concrete is damaged or worn by the impact of the load, vibration, etc. of the driving vehicle, or because it causes peeling at the interface portion between the fixed material and the base surface, the side and the stretching device, etc. If the waterproofing property is lowered and the fixing material is broken and scattered, it may cause traffic accidents.

Moreover, in the renovation work, it is necessary to block traffic entirely or partially at night at a low traffic volume so that traffic can be opened early.

Japanese Patent No. 3650850 proposes a method of leveling a road bridge stretching device using an acrylic mortar or a methacrylic resin mortar, but the acrylic resin mortar or methacrylic resin mortar used in this method has a compressive strength. The expression resistance and the wear resistance are excellent, but the impact resistance is not sufficient because it does not have elastic recovery.

[Previous Document] Japanese Patent Registration No. 3650850

SUMMARY OF THE INVENTION An object of the present invention is to provide an elastic mortar having excellent workability to enable vehicle traffic at an early stage, excellent flowability and fastness, but excellent durability, impact resistance, abrasion resistance, and interfacial separation, and a construction method using the same. .

One aspect of the present invention for achieving the above object, 5 to 10% by weight of the elastic mixture, 10 to 30% by weight of the cured mixture and 60 to 80% by weight of the reinforcing mixture, the elastic mixture, polyol 33.5 ~ 42.1 weight %, 12-15 wt% amine compound, 31.5-33.8 wt% calcium carbonate, 0.1-0.4 wt% lead compound, 2-6 wt% carbon black, 0.5-1.5 wt% defoamer, and 8-11 wt% plasticizer It is an elastic mortar.

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In addition, the cured mixture may include 18 to 24% by weight of urethane resin, 72 to 80% by weight of polyol, 1 to 4% by weight of fluidizing agent, 0.3 to 0.8% by weight of pigment, and 0.1 to 0.5% by weight of thickener.

In addition, the reinforcing mixture, silica sand No. 22-29% by weight, silica sand no. 18-18% by weight, silica sand no. 5-12-19% by weight, silica sand no. 7-14% by weight, calcium carbonate 7-14% by weight And it may include 18 to 25% by weight of alumina aggregate.

On the other hand, this aspect of the present invention, the defect removal step of removing the defects around the gap portion; A noodle grinding step of noodle grinding by removing the defect portion by shot blasting; Removing foreign substances by blowing foreign substances remaining on the surface of the noodle by using air blooming; Wet maintenance step of maintaining a wet state by adjusting the moisture content in the site where the foreign matter is removed; A primer applying step of uniformly applying a primer to the weak part of the wet state; Charging the elastic mortar according to claim 2 to the gap portion; And after curing the elastic mortar is a construction method using the elastic mortar comprising the step of removing the formwork.

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In particular, the elastic mortar according to the present invention can be filled to every corner of the connecting device and the filling position because of excellent fluidity, and after curing, it is excellent in adhesion to concrete, asphalt, impact resistance and abrasion resistance. Therefore, the construction using the elastic mortar according to the present invention can open the traffic in a short time and can reduce the occurrence of damage caused by the long running of the vehicle.

Hereinafter, embodiments according to the present invention are disclosed. In describing the embodiments, the same reference numerals refer to the same configuration, and additional descriptions that may overlap or limit the meaning of the invention may be omitted in describing the embodiments of the present invention.

Prior to the detailed description, the concept of the invention, in spite of the singular form of the present disclosure, in the light of the circumstances in which the singular / plural is not clearly distinguished in the use of Korean and in the ordinary terminology used in the art. It is used in the sense that it includes plural expressions unless otherwise contradictory or clearly different from each other. In addition, the words "include", "have", "include", "comprise", or the like described or described in this specification may indicate in advance the possibility of the presence or addition of one or more other features or components, or a combination thereof. It should be understood that it does not exclude.

In addition, in the present invention, 'composition' is a term that includes the meaning of the original mixture and the compound, in the present invention 'composition' of the 'binder composition' is a 'mixture', unless otherwise stated or contrary to the overall content of the invention It is used to mean '.

The elastic mortar according to the present invention is composed of 5 to 10% by weight of the elastic mixture (component A), 10 to 30% by weight of the cured mixture (component B) and 60 to 80% by weight of the reinforcement mixture (component C).

The elastic mixture (component A) according to the present invention is 33.5-42.1 wt% of polyol, 12-15 wt% of amine compound, 31.5-33.8 wt% of calcium carbonate, 0.1-0.4 wt% of lead compound, carbon black 2 ~ 6 weight%, antifoam 0.5-1.5 weight%, and plasticizer 8-11 weight% are comprised.

Polyol which is one component of the elastic mixture according to the present invention, 33.5 ~ 42.1% by weight of the elastic mixture is mixed, if less than this range is less reactive, if more than this range the strength is improved but the material is more than necessary Overmixing increases costs.

The polyol may be an alkylene glycol such as ethylene glycol, polypropylene glycol, or glycols such as polyalkylene glycol, polyester glycol, or polyether glycol. In the present invention, polypropylene glycol may be used. Preferably, alternatively, two or more kinds may be mixed and used.

The amine compound, which is one component of the elastic mixture according to the present invention, is mixed in a range of 12 to 15% by weight, and if it is mixed in this range or less, it is difficult to shorten the curing time. It doesn't work.

The amine compound may be used by mixing any one or more selected from polyoxypropylene diamine, triethylenetetriamine and diethylenetriamine.

Calcium carbonate (CaCO ₃ ) as one component of the elastic mixture according to the present invention is a filler, 31.5 ~ 33.8% by weight is mixed, the filling density is lowered when mixed below this range, the filling density is mixed when more than this range The cost increases due to excessive mixing of the materials, but more than necessary. In the present invention, as a filler, instead of the above-mentioned calcium carbonate, silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), iron oxide (Fe ₂ O ₃ ), calcium oxide (CaO), magnesium carbonate (MgCO ₃ ), fume silica (Fume silica), magnesium oxide (MgO), and may be used by mixing one or two or more selected from the group consisting of ceramics (banganite, jade, etc.).

Here, the calcium carbonate is a heavy calcium carbonate (粒 徑 30 ~ 50μ) mechanically crushed limestone, marble, hard calcium carbonate (μ 5μ) chemically purified, hard calcium carbonate treated by colloidation (Colloid) again There are three types (5 0.3 to 0.05 μ), and any one of them can be selected and applied in the present invention.

The elastic mixture according to the present invention contains an inorganic pigment such as lead compound, carbon black. This inorganic pigment is intended to express the desired color, in particular, lead compounds are mixed with the role of pigments for strength enhancement, but it is a harmful substance, it is preferable to be mixed in a small amount of 0.1 to 0.4% by weight. If it is mixed below this range, the strength enhancement is weak. If it is mixed above this range, the strength is strengthened, but the hazard is increased.

Here, the lead compound may be any one selected from lead monoxide, lead tetraoxide, lead nitrate, lead arsenate, lead sulfate, lead chromate, and lead stearate.

Carbon black (black iron oxide) serving as a pigment with the lead compound is preferably mixed at 2 to 6% by weight.

Such inorganic pigments may be used by mixing one or more materials selected from titanium oxide, red iron oxide, yellow iron oxide, chromium oxide (CrO ₃ ), and purple iron oxide, as well as the lead compound and carbon black. Depending on the amount of the mixture, red, green, yellow, black, blue, and white can be implemented in various colors.

In the elastic mixture according to the present invention, a small amount of an antifoaming agent and a plasticizer may be mixed. The antifoaming agent tends to leave air bubbles easily when the ratio of the binder for increasing the strength is increased, but when it is mixed in the elastic mixture in the range of 0.5 to 1.5% by weight, the air bubbles become a proper amount, contributing to the improvement of workability and strength. Here, the antifoaming agent may be applied to the silicone, surfactant and higher alcohol.

In addition, the plasticizer plays a role of imparting flexibility, durability and cold resistance to the elastic mixture, and in order to sufficiently obtain such an effect, 8 to 11 wt% is preferably mixed.

Here, plasticizers include DOP (dioctyl phthalate), DOA (dioctyl adipate), TCP (tricresyl postate) and the like. DOP is used for polyvinyl chloride, DOA is for cold resistance, and TCP is flame resistant. In particular, DOP or DOA is often used in place of another group instead of an octyl group. In the present invention, any one of the three listed above can be selected and applied.

The hardening mixture (component B) which concerns on this invention contains 18-24 weight% of urethane resins, 72-80 weight% of polyols, and 1-6 weight% of additives.

The urethane resin, which is a component of the cured mixture according to the present invention, is 18 to 24% by weight. When the mixture is mixed in this range or less, the adhesive strength and the curing strength of the elastic mortar decrease. The adhesive strength and the curing strength are improved, but the mixing ratio of the polyol to be described later is lowered, and thus the mixing property is lowered.

The urethane resin may be a water dispersible polyisocyanate which is made hydrophilic with polyether alcohol having aliphatic and alicyclic bonded isocyanate groups and containing nonionic groups as conditioners of elastic mortar. The starting compounds for the preparation of water dispersible polyisocyanates have a molecular weight of 140 to 400 and are selected from diisocyanates containing aliphatic and cycloaliphatic bonded isocyanate groups, said diisocyanates being either phosgenated or without phosgene. Method, for example by decomposition of the corresponding urethane. Examples include 1,4-butane diisocyanate, 1,6-hexamethylene diisocyanate (HDI), 1,5-diisocyanato-2,2-dimethyl-pentane, 2,2,4- or 2,4, 4-trimethyl-1,6-diisocyanatohexane, 1,10-diisocyanatodecane, 1,3- and 1,4-diisocyanatocyclohexane, 1-isocyanato-3,3,5-trimethyl -5-isocyanatomethyl-cyclohexane (isophorone diisocyanate, IPDI), 4,4'-diisocyanatodicyclohexyl-methane, 1,3-diisocyanato-2 (4) -methylcyclohexane and And mixtures thereof. Also suitable are polyisocyanates prepared by modifying the aforementioned diisocyanates to incorporate uretdione, isocyanurate, urethanes, allophanates, biurets, iminooxadiazinediones, and / or oxadiazine trione groups, In the present invention, toluene diisocyanate may be used.

Polyol, which is one component of the cured mixture according to the present invention, is mixed in an amount of 72 to 80% by weight, and when mixed in this range or less, the curing strength falls when mixed in this range or less. However, the cost is increased because the material is overmixed more than necessary.

As the polyol, alkylene glycols such as ethylene glycol and polypropylene glycol, and glycols such as polyalkylene glycol, polyester glycol, and polytereglycol may be used. In the present invention, polypropylene glycol may be used. Although preferably used, two or more kinds may be mixed and used.

1 to 6% by weight of the additive which is one component of the cured mixture according to the present invention is mixed. Subsequently, the additive includes 1 to 4 wt% of a fluidizing agent, 0.3 to 0.8 wt% of a pigment, and 0.1 to 0.5 wt% of a thickener.

The fluidizing agent is preferably mixed with a polycarboxylic acid-based fluidizing agent in order to improve the compatibility with the resin. Here, when a melamine-based or naphthalene-based fluidizing agent other than the polycarboxylic acid-based fluidizing agent is used, bubbles are generated when mixed with the resin, which deteriorates the workability of the mortar and lowers the durability.

The pigment may be a transparent color or a conventional pigment can be added, the pigment may be an inorganic or organic pigment. Pigments may be added to the cured mixture in consideration of specific gravity or covering power, but may be mixed with 0.3 to 0.8 wt% of the toner beforehand.

The thickeners are unnecessary chemical additives such as suppressing material separation and compacting vibration during mortar construction by improving the viscosity and cohesion of the cured mixture, and may be mixed up to 0.1 to 0.5% by weight, and when added in excess of air Care should be taken as this may result in decreased strength due to entrainment.

In the present invention, any one of methyl cellulose, hydroxyethyl cellulose and polyvinyl alcohol may be selected and used as the thickener.

Reinforcing mixture (component C) according to the present invention, as aggregate, silica sand No. 3 22-29%, silica sand No. 4-18-25%, silica sand No. 12-19%, silica sand No. 6-14% , Calcium carbonate 7-14 wt% and alumina aggregate 18-25 wt%. Alternatively, ocher, clay, silica sand, zeolite, alumina, tourmaline, calcite, pearlite, elite, silica and the like may be additionally or alternatively used.

The reinforcing mixture is mixed 60 to 80% by weight with respect to the elastic mortar, the strength is lower than this range, the strength is less than this range there is no significant change in the strength and the amount of other materials is less workability is not good.

In addition, the said calcium carbonate can use industrial calcium carbonate powder, coal stone powder, etc., for example. As other calcium carbonates, it is also possible to use pulverized matters such as shells, corals or the like whose main components are calcium carbonates or processed products thereof. It is preferable that the brain specific surface area of calcium carbonate is 2000-10000 cm <2> / g. If the brain specific surface area is less than 2000 cm 2 / g, the reactivity of the calcium carbonate becomes small, and there is a concern that the strength expressability and durability of the cement hardened body are lowered. In addition, it is difficult to obtain the brain specific surface area exceeding 10000 cm 2 / g, and there is a fear that the fluidity and workability of the cement hardened body are lowered.

Hereinafter, an Example and a comparative example demonstrate this invention concretely. This invention is not limited to this.

1. Preparation of Elastic Mortar

(1) Preparation of Elastic Mixture (A)

Ingredient (A) Composition ratio Manufacturer or type Polyol 38 g degen oil & chemical
Polypropylene glycol Amine compound 14 g Air Product, Dabco 33LV Calcium carbonate 32 g Heavy calcium carbonate, mechanically crushed limestone and marble Lead compounds 0.2 g Lead stearate Carbon black 4 g Cabot Antifoam 1 g BYK company, siloxane system Plasticizer 10.8 g DOP (dioctylphthalate) Sum 100 g

(2) Preparation of Cured Mixture (B)

Ingredient (B) Composition ratio Manufacturer or type Urethane Resin 22 g Toluene diisocyanate
(Toluene Diisocyanate) Polyol 74.2 g degen oil & chemical
Polypropylene glycol
additive
Glidants 3g Polycarboxylic acid system Pigment 0.5 g Inorganic pigments Thickener 0.3 g  Methyl Cellulose Sum 100 g

(3) Preparation of Reinforcement Mixture (C) Ingredient (C) Composition ratio Manufacturer or type Gyusa 3 27 g Natural silica Gyusa 4 20g Natural silica Gyusa 5 15 g Natural silica Gyusa 6 10g Natural silica Calcium carbonate 8 g Heavy calcium carbonate, mechanically crushed limestone and marble Alumina Aggregate 20g Commercial item Sum 100 g

2. Test method

(1) fluidity

On a flat steel sheet, the conical barrel of 30 mm in diameter and 50 mm in height was filled with the elastic mortar composition, and then the barrel was removed to measure the width of the flow. The measurement temperature was 25 degreeC.

(2) separation of aggregates

The separation of the paste and the aggregate was visually observed for the elastic mortar composition after the fluidity test. The evaluation of the test result is indicated by ○ that is not separated, and × which is separated.

(3) Compressive Strength According to ASTM C695, 0.5 × 0.5 × 1 inch square column test specimens were produced, and were cured at 23 ° C. and used for testing. The test was according to ASTM D695 at 7 days of age.

(4) impact resistance test

The test piece was prepared by constructing each material kneaded to a thickness of 6 cm using a concrete having a width of 15 x 15 x 26 cm in length and a compressive strength (28 days) of about 40 N / mm ² as the base surface.

(5) strain recovery

According to ASTM C 695, 0.5 × 0.5 × 1 inch prismatic specimens were cured at 23 ° C for 7 days. It was. The test loads the test specimens by ASTM D 695 and immediately removes the load at the time of 5% deformation. After the deformation of the specimen is sufficiently stable, the height of the specimen is measured, and the ratio (unit%) to the height before loading is calculated.

3. Test result

Compounding cost Properties of Elastic Mortar Ingredient (A)
(weight%) Ingredient (B)
(weight%) Ingredient (C)
(weight%) Fluidity
(mm) Separation of aggregate Compressive strength
(N / mm ² )
Impact resistance Strain recovery (%) Example 1 6 22 72 89 ○ 15.4 ○ 92.6 Example 2 8 27 65 92 ○ 15.8 ○ 93.1 Example 3 10 30 60 86 ○ 16.1 ○ 91.6 Comparative example 3 13 84 65 × 10.8 × 61.6

As shown in Table 4, Examples 1 to 3 were excellent in fluidity, separation of aggregates, compressive strength, impact resistance and deformation recovery, while the physical properties were poor in the comparative example outside the normal range.

Therefore, in the present invention, when the elastic mortar is used as a repair material for fixing a connection device used for a joint such as a bridge and an elevated road, the degree of repair material can be maintained and flexibility is provided to prevent damage to the product against external impact. It can be remarkably improved. In addition, the elastic mixture of the present invention is excellent in abundant elasticity, impact mitigation force, crack followability, chemical resistance and physical performance is excellent in adaptability to external impact or stress and very strong adhesion to the surrounding concrete structure. In addition, the elastic mixture is fast curing, wide use temperature range of -35 ~ 90 ℃, do not need to use a solvent, there is no concern for environmental friendliness and stability.

On the other hand, the construction step using the elastic mortar according to the present invention in the gap between the connecting device and the structure to fix the connecting device to the bridge structure according to the following procedure.

The first step is to remove the defect (S10). The first step is to remove the missing part around the gap using a work tool.

The second step is a surface grinding step (S20). In the second step, foreign substances such as chloride, oil, paint, etc., which are degraded on the surface of the gap, are removed. In particular, chipping hammers, rakes, stone cutters and other techniques can be used where more extensive removal is required. Sawing around the area to be removed is recommended to reduce edge splitting and to provide a flawless surface for laying patching material. The first step in the application of polymer resin concrete to weaken or crack the surrounding solid concrete is to be shotblasted on the concrete surface. Shot blasting equipment is decided according to the size of the surface to be applied, and equipment for blasting the surface 40cm wide is used.

The third step is the maintenance step (S30). Step 3 may not be implemented if no repairs are available. The repairing step is to fill the cracked surface of the surface area is filled with epoxy resin, and the recessed portion is patched with a patching material.

Damaged areas should be patched with suitable repair materials before applying the primer, and patching and crack repair materials should be compatible with the primer. All repair materials must be properly cured before applying the primer. For best results, the hydraulic cement patching material should be cured for 28 days. If the repair materials do not cure, adhesion tests should be conducted to determine when good adhesion can be achieved.

Step 4 is to remove the foreign matter (S40). Step 4 is a step of removing by blowing foreign matter remaining on the surface of the noodle. Foreign material removal may be used such as airblooming or high pressure water jet.

Step 5 is a wet maintenance step. Step 5 is to maintain the wet state by adjusting the moisture content in the site where the foreign matter is removed. After measuring the moisture content of the site where the foreign matter is removed using a moisture meter or the like, the moisture content is managed not to be less than 6%, if more than 10% is adjusted to 10% or less by hot air or warm air.

Step 6 is a primer application step. Step 6 is a step of uniformly applying the primer on the wet holding surface, it is suitable in the construction period to use an epoxy resin primer having a usable time of less than 40 minutes, the coating amount is 0.3 ~ 0.9L / m ² desirable.

Steps 7 and 8 are an elastic mortar filling step and a form removing step, in which the elastic mortar according to the present invention is filled into the gap portion and the form is removed after filling is completed. Before touched by hand, the elastic mortar of the present invention is kneaded and introduced into the installed mold, and the surface is flattened with a trowel or the like to remove the mold after curing is completed.

The scope of the present invention is not limited to the above-described embodiment but may be implemented in various forms of embodiment within the appended claims. Without departing from the gist of the invention as claimed in the claims, it will be appreciated by those of ordinary skill in the art that the present invention is intended to be within the scope of the present invention to the extent that it can be modified.

Claims (6)

delete 5 to 10% by weight of the elastic mixture, 10 to 30% by weight of the cured mixture and 60 to 80% by weight of the reinforcement mixture,
The elastic mixture, polyol 33.5-42.1%, amine compound 12-15% by weight, calcium carbonate 31.5-33.8% by weight, lead compound 0.1-0.4% by weight, carbon black 2-6% by weight, antifoam 0.5-1.5% by weight And 8 to 11% by weight of a plasticizer.
The method of claim 2, wherein the cured mixture is
An elastic mortar comprising 18 to 24% by weight of urethane resin, 72 to 80% by weight of polyol, 1 to 4% by weight of fluidizing agent, 0.3 to 0.8% by weight of pigment, and 0.1 to 0.5% by weight of thickener.
The method of claim 2, wherein the reinforcing mixture,
22-29 weight% of silica sand 3, 18-25 weight% of silica sand 4, 12-19 weight% of silica sand 5, 7-14 weight% of silica sand 6, 7-14 weight% calcium carbonate and 18-25 weight of alumina aggregate Elastic mortar, characterized in that it comprises%.
As a construction method for constructing the elastic mortar according to any one of claims 2 to 4 in the gap between the connecting device and the structure to fix the connecting device to the bridge structure,
A defect removal step (S10) of removing a defect around the gap portion;
Noodle grinding step (S20) of noodle removal portion removed by shot blasting;
A foreign material removing step of removing foreign matters by blowing the remaining foreign materials on the surface of the noodle by using air blooming (S40);
Wet maintenance step (S50) to maintain the wet state by adjusting the moisture content in the site where the foreign matter is removed;
A primer applying step (S60) of uniformly applying an epoxy primer on the wet holding surface;
A filling step (S70) of filling the elastic mortar according to any one of claims 2 to 4 in the gap portion; And
Forming step of removing the formwork after curing the elastic mortar (S80); Construction method using an elastic mortar comprising a. delete