KR102510404B1 - Mortar agent - Google Patents

Abstract

The present invention relates to a non-shrinkage mortar composition for the ready-made pile embedding method, and more particularly, by utilizing binder and aggregate as circulating resources, it is not lost even in an aquifer such as a sand gravel layer with very high permeability inside the ground, and a river pile Or it relates to a non-shrinkage mortar composition for ready-made pile embedding method that can be filled by replacing the existing cement paste milk solution so that it can be well attached to the surface of the concrete pile.
The non-shrinkage mortar composition for the ready-made pile embedding method according to the present invention includes 2 to 200 parts by weight of circulating fluidized bed boiler fly ash and 10 to 1,000 parts by weight of sodium bicarbonate desulfurization dust from steelworks based on 100 parts by weight of blast furnace slag fine powder as a binder, and aggregate Circulating fluidized bed boiler bottom ash adjusted to a particle size of 0.01 to 5 mm includes 20 to 2,000 parts by weight based on 100 parts by weight of the blast furnace slag fine powder.

Description

Non-shrinkage mortar composition for ready-made pile embedding method {MORTAR AGENT}

The present invention relates to a non-shrinkage mortar composition for the ready-made pile embedding method, and more particularly, by utilizing binder and aggregate as circulating resources, it is not lost even in an aquifer such as a sand gravel layer with very high permeability inside the ground, and a river pile Or it relates to a non-shrinkage mortar composition for ready-made pile embedding method that can be filled by replacing the existing cement paste milk solution so that it can be well attached to the surface of the concrete pile.

In accordance with the recent trend of strengthening noise and vibration regulations during pile foundation construction at construction sites, pile construction using the embedded pile method is increasing.

Embedded pile construction is a method of digging holes in the ground using an auger and planting ready-made PHC piles or tip-extended piles, even in aquifers such as first-class cement in the space between the ground and piles or sand gravel layer with very high permeability inside the ground. It is performed by a method of strengthening the frictional force and bearing capacity of a pile by filling a fixative prepared by mixing water with a powder in which bentonite is added to type 1 cement so as not to be lost.

The basic role of the fixing material between the drilled hole and the pile is to play the function of the fixing material for the independence of the pile and the frictional force of the pile in the initial stage of loading.

However, since Type 1 cement is manufactured by mining limestone, which is the main raw material, and calcining it at a high temperature of 1,450 ° C, a large amount of CO ₂ gas, which is the main cause of greenhouse gases, is generated during the decarboxylation process of limestone, which causes global warming.

In addition, since cement is strong enough to reach a pH of 13 or more, it is not preferable when used in soil.

In addition, bentonite is a mineral that does not exist as a natural resource in Korea, and is an expensive material that is entirely dependent on imports. When it comes into contact with salt, its degree of swelling significantly decreases, resulting in a significant decrease in water repellency.

Recently, several technologies have been proposed to improve the performance of these existing cements. This technology uses type 1 cement as the main raw material, partially replaces it with blast furnace slag and pulverized coal boiler fly ash, and adds various expensive admixtures and admixture raw materials.

Therefore, the manufacturing process is very complicated, the production costs are high, and since various raw materials must be used at the same time, it is difficult to select a mixture according to variations in physical and chemical quality characteristics of raw materials.

In addition, if cement milk contains a lot of groundwater in the ground to be filled, or if there is an aquifer, or if it is filled in a ground with large gaps between soil particles, the cement milk is lost before curing and the bearing capacity is reduced, and the ground with little loss Even in a more dilute state, that is, it is changed to an empty mixture, the frictional bearing capacity is reduced, and since the space between the pile and the drilled hole is not filled, the ground flows laterally and settles for a long time, and the horizontal displacement of the pile occurs, resulting in the vertical bearing capacity of the pile In addition, there was a problem that the horizontal bearing capacity was low.

In order to improve the problem of using the existing cement milk solution as an injection material, the following technology has been proposed.

Korean Patent Registration No. 10-07262991 suggests a ready-made pile embedding method using dry mortar prepared by mixing cement with sand, admixture, water inseparable admixture, fluidizer, etc.

The above technology has the advantage of preventing loss and increasing surface friction by using dry mortar instead of cement milk liquid when applying the ready-made pile embedding method, but raw material costs due to the use of dry sand and expensive admixtures for cement when manufacturing dry mortar There was a problem with too much elevation.

Registered Patent No. 10-07262991 Registered Patent No. 10-2138008 Registered Patent No. 10-2021116

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is not lost even in an aquifer such as a sand gravel layer having a very high permeability inside the ground, and can be well attached to the surface of a river pile or a concrete pile. It is to provide a non-shrinkage mortar composition for ready-made pile embedding method that can replace the existing cement paste milk solution.

In order to solve the above technical problem, the non-shrinkage mortar composition for the ready-made pile embedding method according to the present invention is based on 100 parts by weight of blast furnace slag fine powder as a binder, 2 to 200 parts by weight of circulating fluidized bed boiler fly ash and steelworks sodium bicarbonate desulfurization dust 10 to 1,000 parts by weight, and circulating fluidized bed boiler bottom ash adjusted to a particle size of 0.01 to 5 mm as an aggregate contains 20 to 2,000 parts by weight based on 100 parts by weight of the blast furnace slag fine powder.

In addition, the circulating fluidized bed boiler fly ash is preferably produced in a circulating fluidized bed boiler that mixes and burns coal, waste tires, and limestone.

In addition, based on 100 parts by weight of the blast furnace slag fine powder, 5 to 100 parts by weight of cement are further included, and the cement is ordinary Portland cement, semi-crude Portland cement, crude Portland cement, CSA (Calcium Sulfur Aluminate), blast furnace slag cement, It is characterized in that it further comprises any one or a mixture of two or more of fly ash cement.

In addition, 5 to 100 parts by weight of an expansion material is further included with respect to 100 parts by weight of the blast furnace slag fine powder, and the expansion material further includes any one or a mixture of two or more of quicklime, light-burnt dolomite, quick-burnt dolomite dust and light-burnt dolomite dust. to be characterized

In addition, it is characterized in that it further comprises 0.01 to 10 parts by weight of an in-water non-separation agent based on 100 parts by weight of the blast furnace slag fine powder.

According to the present invention, by using circulating resources that are insufficiently utilized as binders and aggregates, the existing soil is not lost even in aquifers such as sand and gravel layers with very high permeability inside the ground, and can be well attached to the surface of steel piles or concrete piles. It can replace cement paste milk solution.

In addition, since a large amount of calcium oxide is contained in the circulating fluidized bed boiler fly ash and the circulating fluidized bed boiler bottom ash, it is possible to compensate for volumetric shrinkage as moisture evaporates from the mortar.

Hereinafter, the non-shrinkage mortar composition for the ready-made pile embedding method according to the present invention will be described in detail.

The non-shrinkage mortar composition for the ready-made pile embedding method according to the present invention includes 2 to 200 parts by weight of circulating fluidized bed boiler fly ash and 10 to 1,000 parts by weight of sodium bicarbonate desulfurization dust from steelworks based on 100 parts by weight of blast furnace slag fine powder as a binder, and aggregate Circulating fluidized bed boiler bottom ash adjusted to a particle size of 0.01 to 5 mm includes 20 to 2,000 parts by weight based on 100 parts by weight of the blast furnace slag fine powder.

The fine powder of blast furnace slag is a by-product obtained by quenching slag in a high-temperature molten state, which is generated as a by-product in the blast furnace process, with water. When the blast furnace slag powder comes into contact with water, it forms an amorphous film and does not undergo a hydration reaction by itself, so the blast furnace slag powder is called latent hydraulic material. In order to exhibit latent hydraulic properties, the amorphous film must be destroyed.

The blast furnace slag fine powder is inspected to have a 0.045 mm (45 μm) sieve residue of less than 10%, or pulverized and classified, and is used after pulverizing slag in a water quenching furnace in which slag is quenched with water. Since the blast furnace slag fine powder consists of less than 10% of the 0.045 mm (45 μm) sieve residue, there is an advantage in that latent hydraulic properties can be exhibited by improving the activity of the particles.

When water is added to the normal blast furnace slag fine powder, an amorphous film is formed on the surface, and elution of Ca ²⁺ , Al ³⁺ , etc. from the inside does not occur. However, when water is introduced after mixing the circulating fluidized bed boiler fly ash and steel mill sodium bicarbonate desulfurization dust, Ca ²⁺ and OH ^- and Na ⁺ and SO ₄ ^2- are separated into ionic states, respectively, and OH ^- and SO ₄ The ^2- component destroys the amorphous film of the blast furnace slag fine powder, making elution of Ca ²⁺ and Al ³⁺ easy, and the eluting ions quickly promote hardening by generating CaO-SiO ₂ -H ₂ O-based hydrates, etc. And, the excess sulfur oxide generates an ettringite hydration product (3CaO Al ₂ O ₃ 3CaSO ₄ 32H ₂ O) having a needle-like structure, thereby densifying the internal structure of the hydrated body and improving the compressive strength of the hardened body. can

The circulating fluidized bed boiler fly ash is fly ash produced in a circulating fluidized bed boiler that mixes and burns coal, waste tires, and limestone, and is a combustion residue mainly generated in small and medium-sized cogeneration plants that do not have separate desulfurization facilities. Since waste tires, coal and limestone are co-fired, a large amount of carbon, which is an incomplete combustion product of waste tires, is included in the fly ash of the circulating fluidized bed boiler, and sulfurous acid gas generated by combining sulfur components of coal and oxygen in the air is converted into CaO decarbonated from limestone. It has a relatively high CaO content compared to fly ash produced in a general PC boiler that burns coal.

In addition, the mortar shrinks in volume as the moisture it contains evaporates. The circulating fluidized bed boiler fly ash using the in-furnace desulfurization method and the circulating fluidized bed boiler bottom ash described later contain a large amount of calcium oxide, thereby reducing the volume of the mortar. will be compensated

On the other hand, general fly ash is generated in a large-scale PC boiler of a coal-fired power plant. In the case of fly ash generated because of the sulfur component of coal used as fuel, a separate desulfurization facility is operated, and the main component is SiO ₂ . Combustion residues such as the PC boiler fly ash have a high vitrification rate and have pozzolanic reactivity, so despite being recycled as a concrete admixture, the circulating fluidized bed boiler fly ash according to the present invention contains a large amount of calcium oxide and absorbs, generates heat and expands. Due to its characteristics, it cannot be used as a concrete admixture material.

However, the chemical reaction by the calcium oxide component of the circulating fluidized bed boiler fly ash has the effect of compensating for the shrinkage, which is a disadvantage of cement.

In addition, the circulating fluidized bed boiler fly ash has a black color due to unburned carbon powder, and when used in general concrete, the black color is exposed on the surface of the concrete, making it difficult to utilize visually.

However, since the present invention is a mortar injected into the ground, it is not limited to the color, so there is no problem with the black color due to the unburned carbon content of the circulating fluidized bed boiler fly ash, and as described above, the shrinkage due to the calcium oxide contained in a large amount It is used as compensation and blast furnace slag stimulant.

The circulating fluidized bed boiler fly ash is preferably incorporated in an amount of 2 to 200 parts by weight based on 100 parts by weight of the blast furnace slag fine powder. If it is less than 2 parts by weight, there is no alkali stimulation effect, and if it exceeds 200 parts by weight, there is a large amount of blast furnace slag fine powder and circulating fluidized bed boiler fly ash that has not initiated the hydration reaction, resulting in a rapid decrease in strength.

The steelworks sodium bicarbonate desulfurization dust is preferably dust generated after desulfurization treatment using sodium bicarbonate (NaHCO ₃ ) having a purity of 90% or more as a desulfurization agent to remove SOx generated from an exhaust gas line during the steelworks sintering process.

In the sintering process of the steelworks, since the exhaust gas contains a large amount of sulfur (S), sulfur is removed from the exhaust gas by using a desulfurization facility to prevent air pollution. Recently, the use of sodium bicarbonate as a desulfurization agent, which has the advantage of having high desulfurization efficiency, is gradually increasing.

The process of using sodium bicarbonate as a desulfurization agent consists of reacting sodium bicarbonate in exhaust gas, collecting and collecting the reaction product in the form of sulfide, and disposing of it.

2NaHCO ₃ : desulfurization agent, Na ₂ SO ₄ : waste

The desulfurization process must complete the reaction quickly within a limited time at a given exhaust gas temperature, and sodium bicarbonate is used as an optimal desulfurization agent because it is thermally decomposed into sodium carbonate from a relatively low temperature of 95 ° C.

In this desulfurization process, the higher the fineness of sodium bicarbonate, the higher the reaction rate with the sulfur component in the exhaust gas, and it is possible to effectively adsorb harmful heavy metals in the exhaust gas to keep the exhaust gas discharged into the atmosphere clean. It happens.

However, as described above, sodium bicarbonate desulfurization dust can be used as a stimulus for blast furnace slag fine powder, but it is difficult to use as a ready-mixed concrete material used together with rebar due to the presence of chlorine, and Portland to suppress the alkali aggregate reaction due to its high sodium content. Due to the limitation of the total amount of sodium component of cement (3.0 kg or less equivalent of Na ₂ O per 1 m3 of Con'c), it is difficult to use it as a binder for concrete in which aggregate is used.

It is preferable that 10 to 1,000 parts by weight of the steelworks sodium bicarbonate desulfurization dust is mixed with respect to 100 parts by weight of the blast furnace slag fine powder. If it is less than 10 parts by weight, the reaction of the granulated blast furnace slag powder to the stimulant can be achieved almost 100%, but the strength enhancing effect is insufficient. There is a large amount of sodium bicarbonate desulfurization dust, making it difficult to develop strength. In addition, the sodium bicarbonate desulfurization dust plays a very advantageous role in securing initial fluidity due to its high solubility in water.

The circulating fluidized bed boiler bottom ash is any one selected from the group consisting of coal, general solid fuel (SRF, Solid Refuse Fuel), petroleum coke, bio-solid fuel (BIO-SRF, Biomass-Solid Refuse Fuel), waste tire, and organic sludge or at the bottom of a circulating fluidized bed boiler that uses a mixture of two or more fuels. In the desulfurization process of the circulating fluidized bed boiler, limestone is injected into the combustion chamber and burned together with fuel. Sulfur phosphate and limestone in the combustion gas react in the furnace to remove sulfur in the combustion gas and produce anhydrous gypsum. It is carbonated and converted to quicklime components and discharged. In particular, circulating fluidized bed boiler bottom ash burns at a temperature of about 850 ° C and has no glassy component, so it cannot cause pozzolanic reaction, but it contains higher CaO and CaSO ₄ components than fly ash collected from the top, and it is a fine powder of blast furnace slag. It can be said that it has a more excellent composition as a stimulant of Therefore, it is a strong alkali material having a pH of 11.5 or higher and has properties that can act as a stimulant when used together with blast furnace slag fine powder.

The bottom ash generally has a particle size of 5 mm or less, and although the particle size is larger than that of cement and fly ash, it has a stimulating effect of blast furnace slag by itself, so it can play a simultaneous role as a stimulant and fine aggregate, so it is a separate aggregate It can be used immediately as a paste or mortar when mixed with water without input. However, in order to further enhance the stimulation effect of the blast furnace slag, it is more preferable to classify and pulverize the blast furnace slag to a size of 2 mm or less.

The circulating fluidized bed boiler bottom ash is preferably mixed in an amount of 20 to 2,000 parts by weight based on 100 parts by weight of the blast furnace slag fine powder. is lowered, and when it exceeds 2,000 parts by weight, the amount of binder is relatively reduced and the amount of aggregate is excessive, resulting in a significant decrease in strength.

In addition, it further includes 5 to 100 parts by weight of cement based on 100 parts by weight of the blast furnace slag fine powder, and the cement is ordinary Portland cement, semi-crude steel Portland cement, crude steel Portland cement, CSA (Calcium Sulfur Aluminate), blast furnace slag cement, and fly ash cement. It is preferable to further include any one or a mixture of two or more of them. The cement serves to secure initial strength, and any product generally distributed on the market can be used. If the cement is less than 5 parts by weight, the effect is not exhibited, and if it is more than 100 parts by weight, the initial strength increases, but the long-term strength may rather decrease. In addition, harmful components such as hexavalent chromium may be eluted, and economical efficiency is also insufficient.

In addition, 5 to 100 parts by weight of an expansion material is further included with respect to 100 parts by weight of the fine powder of the blast furnace slag, and the expansion material further includes any one or a mixture of two or more of quicklime, light-burnt dolomite, quick-burnt dolomite dust and light-burnt dolomite dust. desirable. The expansion material is an industrial product and can be used as long as it has a purity of 80% or more, and serves to improve the initial strength and expansibility of the non-shrinkage mortar for the ready-made pile embedding method. Since the expansive material is accompanied by heat of about 80 ° C. or higher when reacting with water, the initial hydration reaction can be greatly improved and volume expansion can be induced, which has the effect of consolidating the constrained surrounding ground and prevents subsidence due to volume contraction. It has the effect of improving the frictional force. Quick lime collection dust and light-burnt dolomite collection dust can be used as long as they are discharged as by-products from the limestone and dolomite firing and crushing process. When the amount of the expandable material is less than 5 parts by weight, the effect is not exhibited, and when the amount exceeds 100 parts by weight, excessive expansion occurs, so that the strength may be rapidly lowered.

In addition, it is preferable to further include 0.01 to 10 parts by weight of a non-separating agent in water to prevent separation in water with respect to 100 parts by weight of the blast furnace slag fine powder. Hydroxypropyl methylcellulose (HYDROXY PROPYL METHYL CELLULOSE, HPMC), hydroxy ethyl cellulose (HYDROXY ETHYL CELLULOSE, HEC), carboxymethyl cellulose (CARBOXY METHYL CELLULOSE, CMC), ethyl hydroxyl cellulose (ETHYL HYDROXY ETHYL CELLULOSE, EHEC), POLY ACRYLIC, POLY SACCARIDE, HYDROXY ETHYL METHYL CELLULOSE, HEMC, POLY ETHYLENE OXIDE, PEO, ETHYLENE VINYL ACETATE, It is preferably any one selected from the group consisting of EVA) or a mixture of two or more. If it is less than 0.01 parts by weight, there is no effect of improving non-separation in water, and if it exceeds 10 parts by weight, the viscosity becomes excessive, making construction difficult.

Preferred examples and comparative examples of the present invention will be described below. In addition, the following examples are intended to illustrate the present invention and should not be construed as limiting the scope of the present invention.

Comparative Example (Type 1 Portland Cement + Stone Powder)

First, a mortar mixture was prepared by homogeneously mixing 300 parts by weight of stone powder having a particle size distribution of 0.01 mm to 5 mm as an aggregate with respect to 100 parts by weight of Type 1 Portland cement as a binder with a powder ribbon mixer. A mortar mixture was prepared by homogeneously mixing 80 parts by weight of water with a forced mixer based on 100 parts by weight of the binder.

Next, a slump test was conducted using the prepared sample, and a specimen for measuring compressive strength was prepared to measure the compressive strength by age.

Example 1

First, circulating fluidized bed boiler bottom ash having a particle size distribution of 0.01 mm to 5 mm as an aggregate with respect to 100 parts by weight of binder (50% by weight of blast furnace slag fine powder, 10% of circulating fluidized bed boiler fly ash, 40% by weight of steelworks sodium bicarbonate desulfurization dust) 300 parts by weight were homogeneously mixed with a powder ribbon mixer to prepare a mortar mixture.

Wet mortar was prepared by mixing 80 parts by weight of water with respect to 100 parts by weight of the binder and mixing with a forced mixer, and then a slump test was performed using the prepared sample, and a specimen for measuring compressive strength was prepared and compressed by age Strength was measured.

Example 2

First, a particle size distribution of 0.01 mm to 5 mm as an aggregate with respect to 100 parts by weight of the binder (40% by weight of blast furnace slag fine powder, 10% by weight of circulating fluidized bed boiler fly ash, 40% by weight of sodium bicarbonate desulfurization dust at steelworks, 10% by weight of type 1 cement) A mortar mixture was prepared by homogeneously mixing 300 parts by weight of circulating fluidized bed boiler bottom ash with a powder ribbon mixer.

Wet mortar was prepared by mixing 80 parts by weight of water with respect to 100 parts by weight of the binder and mixing with a forced mixer, and then a slump test was performed using the prepared sample, and a specimen for measuring compressive strength was prepared and compressed by age Strength was measured.

Example 3

First, with respect to 100 parts by weight of the binder (45% by weight of blast furnace slag fine powder, 10% by weight of circulating fluidized bed boiler fly ash, 40% by weight of sodium bicarbonate desulfurization dust from steelworks, 5% by weight of quicklime), the aggregate has a particle size distribution of 0.01 mm to 5 mm. 300 parts by weight of circulating fluidized bed boiler bottom ash was homogeneously mixed with a powder ribbon mixer to prepare a mortar mixture.

Wet mortar was prepared by mixing 80 parts by weight of water with respect to 100 parts by weight of the binder and mixing with a forced mixer, and then a slump test was performed using the prepared sample, and a specimen for measuring compressive strength was prepared and compressed by age Strength was measured.

Example 4

First, the binder (49.5% by weight of blast furnace slag fine powder, 10% of circulating fluidized bed boiler fly ash, 40% by weight of sodium bicarbonate desulfurization dust at steelworks, 0.5% by weight of methylcellulose-based water insoluble agent) 0.01 mm to 5 as aggregate with respect to 100 parts by weight Circulating fluidized bed boiler bottom ash having a particle size distribution of mm was homogeneously mixed with a powder ribbon mixer to prepare a mortar mixture.

Wet mortar was prepared by mixing 80 parts by weight of water with respect to 100 parts by weight of the binder and mixing with a forced mixer, and then a slump test was performed using the prepared sample, and a specimen for measuring compressive strength was prepared and compressed by age Strength was measured.

Performance test method and result of non-shrinkage mortar

As shown in Table 1 below, the slump test was conducted according to KS F 2402 (slump test method of concrete) and the compressive strength test was conducted according to KS F 2405 (compressive strength test method of concrete), and the volume change was visually inspected.

Experiment method designation slump KS F 2402 Concrete slump test method compressive strength KS F 2405 Test method for compressive strength of concrete volume change Visual inspection

(1) Slump test results

Table 2 shows the results of measuring the slump of Examples and Comparative Examples. Despite the fact that the weight of the unit binder, the weight of the blending water, and the weight of the aggregate in Examples and Comparative Examples were the same, the slump in Examples was high. This means that it is possible to reduce unit quantity to produce the same slump, so it is effective in improving strength and reducing shrinkage when using the mortar according to the present invention compared to cement + stone powder used in the conventional method.

In the case of Example 1 using blast furnace slag fine powder, circulating fluidized bed boiler fly ash, and steelworks sodium bicarbonate desulfurization dust as binders, and Example 2 in which cement was further added, compared to the comparative example, showed better fluidity, but quicklime and Examples 3 and 4 further containing a methylcellulose-based water-insoluble separator showed a tendency to decrease slightly. This is interpreted as the fact that the viscosity increased due to the incorporation of quicklime and an insoluble in water.

division Slump (cm) Compressive strength (MPa) volume change
(Visual observation) age 3 days age 7 days age 28 days comparative example 16 3.8 7.4 14.2 Occurrence of volumetric contraction Example 1 18 4.4 7.6 15.1 asystole Example 2 18 7.8 12.7 20.3 asystole Example 3 14 6.2 11.3 18.6 asystole Example 4 14 6.4 8.7 15.2 asystole

(2) Uniaxial compressive strength test results

Table 2 shows the uniaxial compressive strength test results of Examples and Comparative Examples.

As shown in Table 2, the initial and long-term strengths of all Examples were higher than those of the Comparative Examples, and this was due to the stimulating effect of the blast furnace slag fine powder by the circulating fluidized bed boiler fly ash and sodium bicarbonate desulfurization dust, as well as the circulating fluidized bed boiler bottom ash and blast furnace slag fine powder This means that it is advantageous in developing strength compared to stone dust, which serves only as a simple aggregate used in the existing grout method, by simultaneously acting as a stimulant and aggregate.

(3) Volume change

As a result of visually observing the volume change before demolding by manufacturing the compressive strength test piece of Example 1, after 1 day, the volume shrinkage occurred in Comparative Example 1, but volume compensation was made by expansibility in all examples, resulting in a non-shrinkable state. could be visually confirmed.

Therefore, the non-shrinkage mortar for the ready-made pile embedding method of the present invention utilizes a large amount of circulating fluidized bed boiler fly ash, steelworks sodium bicarbonate desulfurization dust, and circulating fluidized bed boiler bottom ash as stimulants and aggregates of blast furnace slag fine powder, which are circulating resources, to provide initial fluidity and initial fluidity. It is possible to provide non-shrinkage mortar for pile construction with excellent volume stability while securing strength. The problem of environmental pollution can be solved at the same time.

Claims (3)

Contains 2 to 200 parts by weight of circulating fluidized bed boiler fly ash and 10 to 1,000 parts by weight of steelworks sodium bicarbonate desulfurization dust, based on 100 parts by weight of blast furnace slag fine powder as a binder,
Circulating fluidized bed boiler bottom ash adjusted to a particle size of 0.01 to 5 mm as aggregate includes 20 to 2,000 parts by weight based on 100 parts by weight of the blast furnace slag fine powder,
The circulating fluidized bed boiler fly ash is fly ash produced in a circulating fluidized bed boiler that mixes and burns coal, waste tires and limestone, and is a combustion residue generated in a small and medium-sized cogeneration plant. shrinkage mortar composition.
According to claim 1,
Based on 100 parts by weight of the blast furnace slag fine powder, 5 to 100 parts by weight of cement are further included, and the cement includes ordinary Portland cement, semi-crude Portland cement, crude Portland cement, CSA (Calcium Sulfur Aluminate), blast furnace slag cement, and fly ash. A non-shrinkage mortar composition for ready-made pile embedding method, characterized in that it further comprises any one or a mixture of two or more of cement.
According to claim 1,
5 to 100 parts by weight of an expanding material is further included with respect to 100 parts by weight of the blast furnace slag fine powder,
The expansion material further comprises any one or a mixture of two or more of quicklime, light dolomite, quicklime dust and light dolomite dust.