KR100998283B1 - Admixture composite for mortar and construction method for anchor, nailing using the same - Google Patents

Abstract

The present invention, the dispersant (Plasticizer) 0.1 to 5.0% by weight; Non-Bleeding Agent 0.1 to 10.0% by weight; 50-80% by weight fine powder; High flow rigid admixture containing 10 to 40% by weight of anhydrite, and anchor method and nailing method using the same, high fluidity and filling properties in anchor or nailing method, anti-bleeding performance, material The anti-separation performance facilitates the injection of mortar into the inside of the drilled hole, enables the filling of the inner chamber, and the curing speed is shortened, which shortens the construction period and improves the construction quality and durability.

Anchor, mortar, steep

Description

High flow rigid admixture, anchor method using same, nailing method {ADMIXTURE COMPOSITE FOR MORTAR AND CONSTRUCTION METHOD FOR ANCHOR, NAILING USING THE SAME}

The present invention relates to the field of civil engineering, and more particularly, to anchor and nailing methods and materials used therein.

In the anchoring method or nailing method for reinforcing the ground such as slopes and tunnels, the anchor body or the nail body is embedded in the boring hole after the ground drilling, and cement milk or mortar is injected and filled to form a solid body. It is done in such a way.

In case of using cement milk, it is possible to proceed with the subsequent process only after the cement paste inside the anchor hole is hardened, so that the air becomes long, and bleeding occurs immediately after filling and before condensation, so that voids occur in the perforation hole. There are problems such as the high possibility of construction.

In addition, in the case of using a general mortar, there is a problem that the filling is difficult because of low fluidity, even if the filling to increase the fluidity is also easy to generate voids due to the bleeding after filling.

Therefore, it is urgent to study the anchor or nail injection material that can solve all these problems.

The present invention is designed to solve the above problems, and facilitates the injection of mortar into the inside of the drill hole due to the high fluidity and filling properties in the anchoring or nailing method, anti-bleeding, anti-separation performance, and the inner chamber The purpose of the present invention is to present a high flow rigid admixture, an anchoring method and a nailing method using the same, which enable filling, shorten the construction period and improve construction quality and durability. do.

The present invention, in order to achieve the object as described above, 0.1 to 5.0% by weight of a plasticizer (Plasticizer); Non-Bleeding Agent 0.1 to 10.0% by weight; 50-80% by weight fine powder; It presents a high flow rigid admixture comprising anhydrite (10 to 40% by weight).

The dispersant is preferably composed of any one or a mixture of two or more of Poly-Naphthalene Sulfonate (PNS), Poly-Melamine Sulfonate (PMS), Poly-Carboxilate (PC), and Lignin Sulfonate (LS).

The bleeding prevention material is preferably composed of any one or a mixture of two or more of the acrylic acid ester (Acrylic Acid Ester), silica fume (Silica Fume), meta kaolin (Meta Kaolin).

The steep material is preferably composed of aluminum salt powder or sulfate powder alone or in a mixture.

It is preferable that the high flow rapid admixture further comprises 0.1 to 3.0 wt% of a retarder.

It is preferable that the high flow rapid admixture further comprises 0.1 to 3.0 wt% of an accelerator.

As another means for achieving the above object, the present invention proposes an anchor method characterized in that the perforated hole is filled by mortar in which the high flow rapid admixture is mixed.

Here, by discharging the mortar mixed with the high flow rigid admixture through the anchor discharge port formed at the tip of the anchor body, it is preferable to perform the ground drilling work and the mortar pouring work at the same time.

As another means for achieving the above object, the present invention proposes a nailing method, characterized in that the perforated hole is filled by mortar mixed with the high flow rapid admixture.

Here, by discharging the mortar mixed with the high flow rigid admixture through the anchor discharge port formed at the tip of the nail body, it is preferable to perform the ground drilling work and the mortar pouring work at the same time.

The present invention facilitates the injection of mortar into the perforated hole, enables the filling of the inner chamber, and the curing speed is high due to the high fluidity and filling property, the anti-bleeding performance, and the material separation prevention performance in the anchoring or nailing method. The present invention provides a high flow rigid admixture, anchor method and nailing method using the same, which can shorten the construction period and improve the quality and durability of construction.

Hereinafter, embodiments of the present invention will be described in detail with reference to experimental results.

The present invention relates to admixtures added for imparting high flow rigidity to general mortar.

Since general mortar has low fluidity and it is difficult to penetrate into the anchor hole, the mortar admixture according to the present invention increases the fluidity of mortar by the addition of a plasticizer, so that it does not penetrate into the anchor hole without applying a different injection method. It makes possible to manufacture very high flow mortars very easily.

Specific examples of the dispersant include poly-naphthalene sulfonate (PNS), poly-melamine sulfonate (PMS), poly-carboxilate (PC), and lignin sulfonate (LS). These may be used alone or in combination of two or more thereof.

When the flowability of mortar increases to the high flow level, or when the hydration of cement mortar is delayed to secure pot life, bleeding occurs on the cement mortar, and a large amount of bleeding causes material separation of the cement mortar, thereby This can cause problems in the work or create voids inside the anchor hole.

The admixture according to the present invention is an anti-bleeding material for preventing the above, acrylic acid ester (Acrylic Acid Ester), silica fume (Silica Fume), meta kaolin (Meta Kaolin) alone or a mixture of two or more are used This prevents bleeding by increasing the viscosity of the mortar and suppresses material separation, thereby increasing the flowability of the mortar, and ensuring the injection performance and the material separation prevention performance of the mortar even in the absence of vibration or compaction.

In other words, acrylic acid ester (Acrylic Acid Ester), silica fume (Silica Fume), meta kaolin (Meta Kaolin) is used as a thickener for preventing bleeding and material separation in the admixture according to the present invention, the viscosity and adhesion to cement mortar After the injection of cement mortar, the bleeding and material separation do not occur even after standing for a long time until condensation and curing.

Basically, as a hard material, it is preferable to use aluminum salt powder or sulfate powder individually or in mixture.

Aluminum salt powder and sulphate powder impart hardness to cement and rapidly hydrate with calcium hydroxide present in aqueous solutions of cement and lime to form ettringite hydrate to form hardened cement mortar. Gives rapid hardening performance.

After the initial few minutes in the cement hardened body, the hydration reaction within a few hours to express the strength can be used as a cement steep material.

Aluminum salt powder (40,000cm ² / g of fine powder) has the expandability of volume expansion after hardening by reaction with water. have.

When using more than a certain weight relative to the weight of cement, it is not recommended to use more than 25 to 30% of the weight of cement because cracking due to overexpansion of the cement hardened body and problems of mechanical performance and durability occur.

When using such a radical component alone, it is difficult to secure pot life by condensation momentarily and the long-term strength is lowered. Therefore, by using anhydrite to secure the hydration time, pot life and sufficient working time are solved. To increase the long-term strength of mortar.

In other words, Anhydrite is used as a hydration control material in the admixture according to the present invention, by adjusting the hydration reaction time of the cement to give the pot life up to several tens of minutes and or even several hours to the cement and mortar mixture, It serves to supply calcium hydroxide for the hydration of aluminum salt powder or sulfate powder.

According to the seasonal change and the temperature change, it is desirable to control the setting time, curing time and pot life of the admixture-added mortar, and a retarder and an accelerator may be used as a hydration time adjuster therefor.

Retarders delay the hydration of hard hardwoods to secure pot life and increase the compressive strength of hardened cement.

Specifically, tartaric acid, citric acid, sodium gluconate, or the like may be used alone or in combination of two or more thereof.

The hydration of aluminum salt powder and sulfate powder inhibited by the addition of a retarder is very slow to resume the reaction without the addition of a separate hydration accelerator.

In order to resume the fast hardening of the temporarily hardened cement cured body, it is preferable to use lithium carbonate (Lithium Carbonate) as an accelerator.

Hereinafter, the test results for examining the effects of the admixture according to the present invention will be described.

Table 1 relates to a comparative example, and is a result of testing the physical properties of cement paste (cement milk) and general mortar.

Table 2 shows the mixing ratio of one embodiment of the admixture according to the present invention.

Table 3 shows the results of testing the physical properties of the mortar mixed with 10% of the admixture according to the present invention (Example 1), and Table 4 shows the test results when 20% was mixed (Example 2).

As a result of the test, it was confirmed that all of the embodiments according to the present invention showed less bleeding amount and excellent early and long-term compressive strength than the comparative example.

Since the mortar mixed with the admixture according to the present invention has excellent physical properties such as high fluidity and rapid rigidity, it is easy to inject mortar into the anchor ball or the nail ball, and the curing speed can be shortened, thereby shortening the construction period. However, it can be expected to be excellent effect in any method of anchoring or nailing method.

On the other hand, in the case of a bad rock slope, anchor or nailing construction for reinforcing ground such as tunnels, if the anchor or nailing work of a certain area is long, this causes the ground of other areas to be affected Therefore, while reinforcing the soft ground firmly, it is difficult to meet the difficult problem of the rapid progress of the work.

By using the admixture according to the present invention, such a problem can be solved.

That is, as shown in Figures 1 and 2, through the discharge port 101 formed at the tip of the anchor body or nail body 100, the mortar in which the admixture according to the present invention supplied by the injection hose 110 is mixed It is an anchoring method or a nailing method that simultaneously performs ground drilling and mortar pouring by discharging.

This is due to the above-mentioned high flowability and rapid rigidity characteristics of the mortar into which the admixture according to the present invention is incorporated, and while forming a solid anchor body or a nail body, it is possible to work very quickly, and thus has a high level of difficulty. It can be effectively applied to the reinforcement of.

Since the above has just been described with respect to some of the preferred embodiments that can be implemented by the present invention, as is well known the scope of the present invention should not be construed as limited to the above embodiments, the present invention described above It will be said that both the technical idea and the technical idea which together with the base are included in the scope of the present invention.

1 is for explaining the anchor method or the nailing method according to the present invention,

1 is a side view of an anchor body or a nail body.

2 is a conceptual diagram showing a mortar injection working state.

DESCRIPTION OF REFERENCE NUMERALS

100: anchor body or nail body 101: discharge port

110: injection hose

Claims (10)

0.1 to 5.0% by weight of plasticizer; Non-Bleeding Agent 0.1 to 10.0% by weight; 50-80% by weight fine powder; Anhydrite 10-40 wt%; High flow rigid admixtures containing. The method of claim 1, The dispersant A high flow rigid admixture comprising any one or a mixture of two or more of Poly-Naphthalene Sulfonate (PNS), Poly-Melamine Sulfonate (PMS), Poly-Carboxilate (PC), and LS (Lignin Sulfonate). The method of claim 1, The bleeding prevention material A high flow, hard admixture characterized in that it is composed of any one or a mixture of two or more of acrylic acid ester (Acrylic Acid Ester), silica fume (Silica Fume), meta kaolin (Meta Kaolin). The method of claim 1, The hard hardwood is A high flow rigid admixture comprising aluminum salt powder or sulfate powder alone or as a mixture. The method of claim 1, Retarder A high flow rigid admixture, characterized in that it further comprises 0.1 to 3.0% by weight. The method of claim 1, Accelerator A high flow rigid admixture, characterized in that it further comprises 0.1 to 3.0% by weight. An anchoring method, characterized in that to fill the perforation hole by mortar mixed with the high flow rapid admixture of any one of claims 1 to 6. The method of claim 7, wherein An anchor construction method comprising: performing a ground drilling operation and a mortar placing operation at the same time by discharging the mortar mixed with the high flow rigid admixture through an anchor discharge port formed at the tip of the anchor body. The nailing method of claim 1, wherein the drilling hole is filled by mortar mixed with the high flow rigid admixture of any one of claims 1 to 6. 10. The method of claim 9, Nailing method, characterized in that through the anchor discharge port formed at the tip of the nail body, by performing the ground drilling work and mortar pouring work at the same time by discharging the mortar mixed with the high flow rigid admixture.

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