KR102241729B1 - rapid hardening grout material for ground reinforcement and construction method using the same - Google Patents

Abstract

The present invention relates to a fast hardening grout material for ground waterproofing and ground reinforcement and a construction method using the same, and more particularly, to a fast hardening grout material for ground waterproofing and ground reinforcement with a short gel-time and with ease of gelation control.

Description

Rapid hardening grout material for ground reinforcement and construction method using the same}

The present invention relates to a ground order and a fast-hardening grout material for ground reinforcement, and a construction method using the same, and more particularly, a gel-time is fast, and a ground-order and fast-hardening grout for ground reinforcement that is easy to control gelation. It relates to a material and a construction method using it.

Recently advanced domestic and foreign countries are striving to build infrastructure such as education, culture, and transportation in order to decentralize the oversaturated population on the basis of regional decentralization due to the development of domestic industries and the consequent urban concentration.

Due to this, large-scale civil works such as buildings, roads, high-speed rail, light rail, and subway are actively progressing, and ground improvement and reinforcement are essential for civil works, and tunnel construction is due to economic feasibility in traffic sections such as roads, high-speed rail, light rail, and subway. It must be implemented.

However, in general, when excavation and tunnel excavation is performed on the ground with low strength or low bearing capacity, or when the groundwater level is high, the subsidence of the surrounding ground due to discharge of groundwater is expected, or the relaxation area of the ground during excavation due to soft ground. In this wide case, it is necessary to secure the stability of the underground structure and adjacent structures, so the selection of an appropriate auxiliary method in parallel with the excavation method must be essential.

In addition, problems due to aging of geotechnical structures are frequently occurring in recent years, and construction conditions difficult to construct such as excavation work and tunnel work in urban areas of large depths are increasing.

Accordingly, a grouting method is applied as an auxiliary method to increase the engineering properties of the ground by injecting grouting material into the ground to cope with the decrease in strength, settlement, leakage, and excessive earth pressure.

The grouting method was introduced in the construction work as the effect was confirmed when the grouting material was injected into the ground, but the penetration injection area was very limited because the cement used as the grouting material was thick.

In addition, the conventional grouting material has a problem in that fast hardening is poor and unstable hardening occurs.

Korean Patent Registration No. 10-2036654 (Publication date: 2019.10.25)

The present invention is conceived in consideration of the above points, and the present invention provides a ground order and a fast-hardening grout material for ground reinforcement and a construction method using the same, which has a fast gel-time and is easy to control gelation. There is a purpose.

In order to solve the above-described problems, the ground order and the fast-setting grout material for ground reinforcement of the present invention includes a fast-setting composition and a mortar.

In a preferred embodiment of the present invention, the fast-setting grout material of the present invention may include a fast-setting composition and a mortar in a weight ratio of 1: 0.97 to 1.47.

In a preferred embodiment of the present invention, the fast-setting composition may include a fast-setting powder and water in a weight ratio of 1: 1.72 to 2.58.

In a preferred embodiment of the present invention, the mortar may include cement and water in a weight ratio of 1: 0.74 to 1.11.

In a preferred embodiment of the present invention, the fast-setting powder may contain a rapid economy and a thixotropic agent.

In a preferred embodiment of the present invention, the rapid economy may include amorphous C12A7 (12CaO·7Al ₂ O ₃ )-based fine powder.

In a preferred embodiment of the present invention, a silicon dioxide compound may be included.

In a preferred embodiment of the present invention, the fast-setting powder may include 4.8 to 7.2 parts by weight of a thixotropic agent, based on 100 parts by weight of rapid economy.

In a preferred embodiment of the present invention, the fast-setting powder may further include one or more selected from a fast economy, a fast alert aid, a fast alert aid, a coagulation aid, and a durability enhancer.

In a preferred embodiment of the present invention, the fast-setting powder may further include a fast economy, a fast alert aid, a fast alert aid, a coagulation aid, and a durability enhancer.

In a preferred embodiment of the present invention, the fast-setting powder may include 8 to 12 parts by weight of fast economy, based on 100 parts by weight of fast economy.

In a preferred embodiment of the present invention, the fast-setting powder may contain 11.2 to 16.8 parts by weight of a fast-lighting aid, based on 100 parts by weight of rapid economy.

In a preferred embodiment of the present invention, the fast-setting powder may include 9.6 to 14.4 parts by weight of a fast-setting supplement based on 100 parts by weight of the rapid economy.

In a preferred embodiment of the present invention, the fast-setting powder may contain 6.4 to 9.6 parts by weight of a coagulation aid based on 100 parts by weight of rapid economy.

In a preferred embodiment of the present invention, the fast-setting powder may include 3.2 to 4.8 parts by weight of a durability enhancer with respect to 100 parts by weight of rapid economy.

In a preferred embodiment of the present invention, the fast economy may include sodium aluminate (nNa ₂ O·Al ₂ O ₃ ).

In a preferred embodiment of the present invention, the quick warning aid may include anhydrous gypsum (CaSO ₄ ).

In a preferred embodiment of the present invention, the fast-diameter supplement may include calcium oxide (CaO).

In a preferred embodiment of the present invention, the coagulation aid may include sodium carbonate (Na ₂ CO ₃ ).

In a preferred embodiment of the present invention, the durability enhancer may include calcium formate.

In a preferred embodiment of the present invention, the fast-setting powder may further include at least one selected from an accelerator, a dispersant, and a filler.

In a preferred embodiment of the present invention, the fast-setting powder may further include an accelerator, a dispersant, and a filler.

In a preferred embodiment of the present invention, the fast-setting powder may include 0.08 to 0.12 parts by weight of an accelerator based on 100 parts by weight of rapid economy.

In a preferred embodiment of the present invention, the fast-setting powder may include 0.12 to 0.20 parts by weight of a dispersant based on 100 parts by weight of rapid economy.

In a preferred embodiment of the present invention, the fast-setting powder may include 3.2 to 4.8 parts by weight of a filler based on 100 parts by weight of rapid economy.

In a preferred embodiment of the present invention, the accelerator may include lithium carbonate (Li ₂ CO ₃ ).

In a preferred embodiment of the present invention, the dispersant may include a polycarboxylic acid-based dispersant.

In a preferred embodiment of the present invention, the filler may include cellulose fibers.

In a preferred embodiment of the present invention, the ground order and the fast-hardening grout material for ground reinforcement of the present invention may have a gel-time of 70 seconds or less at a temperature of 15°C.

In a preferred embodiment of the present invention, the ground order and the fast-hardening grout material for ground reinforcement of the present invention may have a gel-time of 18 seconds or less at a temperature of 40°C.

On the other hand, the construction method using the ground order and the fast-hardening grout material for ground reinforcement of the present invention includes the first step of preparing the ground order and the fast-setting grout material for ground reinforcement, and the ground order and the fast-setting grout material for ground reinforcement It may include a second step of injecting into.

In a preferred embodiment of the present invention, the ground order and the fast-setting grout material for ground reinforcement prepared in the first step may be prepared by mixing a fast-setting composition and a mortar in a weight ratio of 1: 0.97 to 1.47.

In a preferred embodiment of the present invention, the fast-setting composition may be prepared by mixing fast-setting powder and water in a weight ratio of 1: 1.72 to 2.58.

In a preferred embodiment of the present invention, the mortar may be prepared by mixing cement and water in a weight ratio of 1:0.74 to 1.11.

The quick-hardening grout material for ground order and ground reinforcement of the present invention and a construction method using the same have a fast gel-time and easy to control gelation.

In addition, the quick-hardening grout material for ground order and ground reinforcement of the present invention and the construction method using the same are excellent in physical properties such as excellent adhesion to the ground, watertightness, salt resistance, waterproofness, corrosion resistance, chemical resistance, neutralization prevention, and antibacterial properties, It can maximize the ground order and ground reinforcement efficiency.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and the same reference numerals are added to the same or similar components throughout the specification.

The ground order and fast-hardening grout material for ground reinforcement of the present invention has a fast gel-time, and at this time, the gel-time refers to the ground order and fast-setting grout material for ground reinforcement of the present invention. It means the time it takes until the viscosity gradually increases and finally loses fluidity and solidifies (gelling). Specifically, the quick-hardening grout material for ground order and ground reinforcement of the present invention may have a gel-time of 70 seconds or less at a temperature of 15°C, and a gel-time of 18 seconds at a temperature of 40°C. It can be below.

The fast-setting grout material for ground order and ground reinforcement of the present invention includes a fast-setting composition and a mortar.

In this case, the fast-setting composition and the mortar may include a weight ratio of 1: 0.97 to 1.47, preferably a weight ratio of 1: 1.1 to 1.35, and more preferably a weight ratio of 1: 1.16 to 1.29. The advantage is that the gel-time is fast.

First, mortar refers to a mixture of cement with water, and may include cement and water in a weight ratio of 1: 0.74 to 1.11, preferably 1: 0.83 to 1.02, and more preferably 1: 0.87 to 0.98. have.

At this time, the cement may include at least one selected from microcement, mixed cement, and special cement, and preferably microcement.

The microcement of the present invention is a cement made of ultra-fine particles and can exhibit excellent properties in improving initial strength. The microcement of the present invention may have a powderiness of 5,000 ㎠/g or more, preferably 5,000 to 9,000 ㎠/g, more preferably 5,500 to 7,500 ㎠/g, and an average particle diameter of 2 to 10 µm, preferably 4 to 8 μm, more preferably 5 to 7 μm, the most excellent initial strength enhancement characteristics can be expressed.

The special cement of the present invention is a cement other than Portland cement and the same series cement, and may preferably include alumina cement.

The mixed cement of the present invention may include Portland cement (KS L 5201) and alumina cement (KS L5205).

Portland cement of the present invention may contain at least one selected from one kind of ordinary cement, two kinds of medium heat cement, three kinds of crude steel cement, four kinds of low heat cement, and five kinds of sulfate-resistant cement, and preferably one kind of ordinary cement And it may include at least one selected from among five kinds of sulfate-resistant cement.

The alumina cement of the present invention may include three types of alumina cement.

When using 1 type Portland cement, 5 types sulfate-resistant cement and 3 alumina cements as the mixed cement of the present invention, the mixing ratio of these is 1 type Portland cement, 5 types sulfate-resistant cement, and alumina cement in a weight ratio of 1: 0.1 to 0.4: 0.25 to 0.45 As, preferably, it may be included in a weight ratio of 1: 0.15 to 0.35: 0.30 to 0.38.

Next, the fast-setting composition refers to that the fast-setting powder is kneaded with water, and the fast-setting powder and water are 1: 1.72 to 2.58 weight ratio, preferably 1: 1.93 to 2.37 weight ratio, more preferably 1: 2.04 to 2.26 weight ratio Can be included as.

The fast-setting powder may contain a rapid economy and thixotropic agent.

Sudden economy is a material for initial reactivity improvement, and can include at least one selected from CSA (Calcium Sulfo Aluminate)-based fine powder, amorphous C12A7 (12CaO·7Al ₂ O ₃ )-based fine powder, gypsum powder, slaked lime powder, and alkali metal salt. And, preferably, amorphous C12A7 (12CaO·7Al ₂ O ₃ )-based fine powder may be included.

Thixotropic agent is a material for maintaining a gel (GEL) state that becomes a liquid close to liquid state when flowing and increases in viscosity in a stable state, and the fast-setting grout material of the present invention contains a thixotropic agent. By doing so, the gel-time can be significantly faster.

The thixotropic agent of the present invention may include a silicon dioxide compound, preferably a crystalline silicon dioxide compound, more preferably a crystalline quartz, and even more preferably a hydro magnesium aluminum silicate ( Hydrous magnesium aluminum silicate).

In addition, the fast-setting powder may contain 4.8 to 7.2 parts by weight, preferably 5.4 to 6.6 parts by weight, and more preferably 5.7 to 6.3 parts by weight, based on 100 parts by weight of the rapid economy. When it has a range, it has the advantage of fast gel-time.

Further, the fast-setting powder of the present invention may further include one or more selected from fast economy, fast alert aid, fast alert aid, coagulation aid, and durability enhancer, and preferably fast economy, fast alert aid, fast alert aid , A coagulation aid and a durability enhancer may be further included.

The fast economy of the present invention is a material that increases the fast hardness of the grout material of the present invention, and may include at least one selected from alkali-based fast economy and alkali-free fast economy such as sodium aluminate-based and sodium silicate-based, and , Preferably sodium aluminate (nNa ₂ O·Al ₂ O ₃ ) may be included.

In addition, the fast-setting powder may include 8 to 12 parts by weight, preferably 9 to 11 parts by weight, and more preferably 9.5 to 10.5 parts by weight, based on 100 parts by weight of the rapid economy.

The fast-warning aid of the present invention is a material that further improves the fast-hardening of the fast economy, and includes calcium sulfo-aluminate, anhydrous gypsum (CaSO ₄ ), and propylene glycol monomethyl ether (CH ₃ CH(OH). CH ₂ OCH ₃ ), dipropylene glycol monomethyl ether (C ₇ H ₁₆ O ₃ ), tripropylene glycol monomethyl ether (CH ₃ (OC ₃ H ₆ ) ₃ OH) and propylene glycol monomethyl ether acetate (CH ₃ COOCH (CH ₃ )CH ₂ OCH ₃ ) may include at least one selected from, and preferably, anhydrous gypsum (CaSO ₄ ).

In addition, the fast-setting powder may include 11.2 to 16.8 parts by weight, preferably 12.6 to 15.4 parts by weight, and more preferably 13.3 to 14.7 parts by weight, based on 100 parts by weight of the rapid economy.

The fast-setting supplement of the present invention is a material that complements the fast-setting of the fast economy, and contains calcium oxide (CaO), and the fast-setting powder of the present invention is 9.6 to 14.4 parts by weight of the fast-setting supplement based on 100 parts by weight of the fast-paced economy. , Preferably 10.8 to 13.2 parts by weight, more preferably 11.4 to 12.6 parts by weight.

The coagulation aid of the present invention serves to control the initial coagulation performance, and may include at least one selected from sodium carbonate and sodium sulfate, and preferably sodium carbonate.

In addition, the fast-setting powder may contain 6.4 to 9.6 parts by weight, preferably 7.2 to 8.8 parts by weight, and more preferably 7.6 to 8.4 parts by weight, based on 100 parts by weight of the rapid economy.

The durability enhancer of the present invention is a material capable of improving initial durability by securing stable physical properties by improving resistance to bleeding and material separation before cement is hardened, and includes silica fume, fly ash, metakaolin, and calcium formate. ) May contain at least one selected from, and preferably may contain calcium formate.

In addition, the fast-setting powder may contain 3.2 to 4.8 parts by weight, preferably 3.6 to 4.4 parts by weight, more preferably 3.8 to 4.2 parts by weight, and less than 3.2 parts by weight, based on 100 parts by weight of the rapid economy. If it is included as, there may be a problem of deteriorating initial durability, and if it exceeds 4.8 parts by weight, there may be a problem in which material separation occurs excessively.

Meanwhile, the fast-setting powder of the present invention may further include at least one selected from an accelerator, a dispersant, and a filler, and preferably, the fast-setting powder may further include an accelerator, a dispersant, and a filler.

The accelerator of the present invention is a material that can reduce working time due to rapid reactivity, sodium sulfide (Na ₂ S 9H ₂ O), sodium carbonate (Na ₂ CO ₃ ), lithium carbonate (Li ₂ CO ₃ ), lithium ide It may include at least one selected from lockside (LiOH·H ₂ O) and aluminum oxide (Al ₂ O _{3 ), preferably lithium carbonate (Li 2} CO ₃ ).

In addition, the fast-setting powder may include 0.08 to 0.12 parts by weight, preferably 0.09 to 0.11 parts by weight, and more preferably 0.095 to 0.105 parts by weight, based on 100 parts by weight of the rapid economy.

The dispersant of the present invention is a material used to secure fluidity and filling, and includes at least one selected from a polycarboxylic acid-based dispersant, a lignin sulfonate-based dispersant, a polynaphthalene sulfonate-based dispersant, and a polymelamine sulfonate-based dispersant. It may be, and preferably, a polycarboxylic acid-based dispersant may be included.

In addition, the fast-setting powder may contain 0.12 to 0.20 parts by weight, preferably 0.14 to 0.18 parts by weight, and more preferably 0.15 to 0.17 parts by weight, based on 100 parts by weight of the rapid economy.

The filler of the present invention is a contact material that improves tensile strength and imparts crack resistance, and may include various fibers, and in the present invention may include cellulose fibers, which are eco-friendly fibers.

In addition, the fast-setting powder may include 3.2 to 4.8 parts by weight of the filler, preferably 3.6 to 4.4 parts by weight, and more preferably 3.8 to 4.2 parts by weight, based on 100 parts by weight of the rapid economy.

On the other hand, the construction method using the ground order and the fast-setting grout material for ground reinforcement of the present invention described above is for the ground order and ground reinforcement prepared in the first step and the first step of preparing the ground order and the fast-setting grout material for ground reinforcement. It may include a second step of injecting the fast-setting grout material into the ground.

At this time, the ground order and the fast-setting grout material for ground reinforcement may be prepared by mixing a fast-setting composition and mortar in a weight ratio of 1: 0.97 to 1.47, and the fast-setting composition includes a fast-setting powder and water in a weight ratio of 1: 1.72 to 2.58. It may be prepared by mixing, and the mortar may be prepared by mixing cement and water in a weight ratio of 1:0.74 to 1.11.

The embodiments of the present invention have been described above, but these are only examples, and do not limit the embodiments of the present invention, and those of ordinary skill in the field to which the embodiments of the present invention belong to are not limited to the essential characteristics of the present invention. It will be appreciated that various modifications and applications not illustrated above are possible within the range not departing from. For example, each component specifically shown in the embodiments of the present invention can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Example 1: Preparation of fast setting grout material

(1) Based on 100 parts by weight of rapid economy, 10 parts by weight of fast economy, 14 parts by weight of quick warning aid, 12 parts by weight of fast warning aid, 8 parts by weight of coagulation aid, 4 parts by weight of durability enhancer, 0.1 parts by weight of accelerator, 0.16 parts by weight of dispersant A fast-setting powder was prepared by uniformly mixing parts by weight, 6 parts by weight of thixotropic agent, and 4 parts by weight of a filler, and a fast-setting composition was prepared by uniformly mixing the fast-setting powder and water in a ratio of 1: 2.15 by weight.

At this time, amorphous C12A7 (12CaO·7Al2O3)-based fine powder as a rapid economy, sodium aluminate (nNa ₂ O·Al ₂ O _{3 ) as a fast economy, anhydrous gypsum (CaSO 4} ) as a fast warning aid, and calcium oxide as a fast warning aid. (CaO), sodium carbonate (Na ₂ CO ₃ ) as a coagulation aid, calcium formate as a durability enhancer, lithium carbonate (Li ₂ CO ₃ ) as an accelerator, polycarboxylic acid-based dispersant as a dispersant, silicon dioxide as a thixotropic agent Compound (product name: MIN-U-GEL FG), cellulose fiber was used as a filler.

(2) Microcement (powder also 7,000 ㎠/g) and water were uniformly mixed at a weight ratio of 1: 0.925 to prepare a mortar.

(3) A fast-setting grout material was prepared by uniformly mixing the prepared fast-setting composition and mortar at a weight ratio of 1: 1.22.

Examples 2 to 10: Preparation of fast-hardening grout material

A fast-setting grout material was prepared in the same manner as in Example 1. However, as shown in Tables 1 to 2 below, a fast-setting grout material was prepared by varying parts by weight of the fast economy, the fast warning aid, the fast warning aid, and the thixotropic agent, respectively, with respect to 100 parts by weight of the rapid economy.

Comparative Examples 1 to 5: Preparation of fast-hardening grout material

A fast-setting grout material was prepared in the same manner as in Example 1. However, as shown in Table 3 below, the weight ratio of the fast-setting powder and water when preparing the fast-setting composition, the weight ratio of microcement and water when preparing the mortar, and the weight ratio of the fast-setting composition and mortar when preparing the fast-setting grout material are different. Thus, a fast-setting grout material was prepared.

Experimental example

For each of the fast-setting grout materials prepared through the Examples and Comparative Examples, gel-times were measured at temperatures of 15°C and 40°C, and are shown in Table 4 below.

As shown in Table 4, it was confirmed that the fast-setting grout material prepared in Example 1 had the fastest gel time.

A simple modification or change of the present invention can be easily implemented by those of ordinary skill in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

Claims (10)

In the ground order and fast-setting grout material for ground reinforcement comprising a fast-setting composition and mortar,
The grout material contains a fast-setting composition and a mortar in a weight ratio of 1: 0.97 to 1.47,
The fast-setting composition includes a fast-setting powder and water in a weight ratio of 1: 1.72 to 2.58,
The mortar contains cement and water in a weight ratio of 1:0.74 to 1.11,
The fast-setting powder is 4.8 to 7.2 parts by weight of a silicon dioxide compound, and 8 to 12 parts by weight of a _{sodium aluminate (nNa 2} O·Al ₂ O ₃ ) based on 100 parts by weight of the amorphous C12A7 (12CaO·7Al ₂ O _{3 )-based fine powder.} , Anhydrous gypsum (CaSO ₄ ) 11.2 to 16.8 parts by weight, calcium oxide (CaO) 9.6 to 14.4 parts by weight, sodium carbonate (Na ₂ CO ₃ ) 6.4 to 9.6 parts by weight, calcium formate 3.2 to 4.8 parts by weight Fast-hardening grout material for ground order and ground reinforcement, characterized in that.
delete delete delete delete delete The method of claim 1,
The fast-setting powder is a fast-setting grout material for ground order and ground reinforcement, characterized in that it further comprises at least one selected from an accelerator, a dispersant, and a filler.
The method of claim 7,
The fast-setting powder comprises 0.08 to 0.12 parts by weight of an accelerator, 0.12 to 0.20 parts by weight of a dispersant, and 3.2 to 4.8 parts by weight of a filler based on 100 parts by weight of the amorphous C12A7 (12CaO 7Al ₂ O _{3 )-based fine powder.} Fast-hardening grout material for order and ground reinforcement.
The method of claim 8,
The accelerator includes lithium carbonate (Li ₂ CO ₃ ),
The dispersant includes a polycarboxylic acid-based dispersant,
The filler is a fast-setting grout material for ground order and ground reinforcement, characterized in that it contains cellulose fiber.
A first step of preparing a ground order and a fast-hardening grout material for ground reinforcement; And
A second step of injecting the ground order and the fast-hardening grout material for ground reinforcement into the ground; Including,
The fast-setting grout material for ground order and ground reinforcement is prepared by mixing a fast-setting composition and mortar in a weight ratio of 1: 0.97 to 1.47,
The fast-setting composition is prepared by mixing fast-setting powder and water in a weight ratio of 1: 1.72 to 2.58,
The mortar is prepared by mixing cement and water in a weight ratio of 1:0.74 to 1.11,
The in hard powder is amorphous _{C12A7 (12CaO · 7Al 2 O 3} ) based with respect to the fine powder 100 parts by weight of 4.8 to the silicon dioxide compound 7.2 parts by weight of sodium aluminate _{(nNa 2 O · Al 2 O} 3) 8 ~ 12 parts by weight , Anhydrous gypsum (CaSO ₄ ) 11.2 to 16.8 parts by weight, calcium oxide (CaO) 9.6 to 14.4 parts by weight, sodium carbonate (Na ₂ CO ₃ ) 6.4 to 9.6 parts by weight, and calcium formate 3.2 to 4.8 parts by weight. Construction method using a fast-hardening grout material for ground order and ground reinforcement, characterized in that manufactured.