KR101321730B1 - Environmental-friendly shrinkage reducing agent and environmental-friendly plastering cement and mortar containing the same - Google Patents

Abstract

PURPOSE: A shrinkage reducing agent is provided to prevent the generation of cracks on desulfurized gypsum, and to remove harmful gas generated from the desulfurized gypsum and cement by mixing the desulfurized gypsum with activated carbon and an adsorbing/deodorizing agent. CONSTITUTION: A shrinkage reducing agent contains 40-80 wt% of desulfurized gypsum, 5-35 wt% of activated carbon, and 2-35 wt% of adsorbing/deodorizing agent. The adsorbing/deodorizing agent contains diatomite, zeolite, and GE-lite. The shrinkage reducing agent contains 10-30 wt% of diatomite, 25-45 wt% of zeolite, 25-45 wt% of X-deo, and 10-25 wt% of GE-lite. Plastering cement contains 20-60 parts by weight of shrinkage reducing agent for 100 parts by weight of regular Portland cement containing 0.1-2 wt% of blast-furnace slag fine powder. Plastering mortar contains 20-60 parts by weight of shrinkage reducing agent, 200-300 parts by weight of sand, and 40-50 parts by weight of water for 100 parts by weight of regular Portland cement containing 0.1-2 wt% of blast-furnace slag fine powder.

Description

Environmentally-friendly Shrinkage Reducing Agent and Environmental-friendly Plastering Cement and Mortar Containing the Same}

The present invention relates to an environment-friendly shrinkage reducing agent and an eco-friendly cement and mortar for plastering using the same. More specifically, the shrinkage reducing agent added to suppress cracking is a diatomaceous earth, zeolite, X as an activated carbon and an adsorbent deodorant in addition to desulfurized gypsum. -By mixing more than one kind of deo, gellite, and high carbon adsorbent, moisture is rapidly evaporated by desulfurization gypsum during the initial curing process, which shortens the condensation rate. By delaying the drying time, it prevents cracking caused by rapid drying, absorbs and removes various harmful gases generated from desulfurized gypsum and cement, and reduces shrinkage to improve the health of the contractor and the user. It is about.

Generally, houses were constructed using natural materials such as wood, stone, and loam. However, due to industrialization and urbanization, housing space is concentrated in a narrow place, and building materials are transformed into cement and concrete. . Because the construction using cement and concrete uses aggregate, the resources for collecting it are depleted, causing destruction of rivers and ecosystem as well as environmental pollution, and pollution is getting worse.

In particular, inhabited cement dwellings are almost exposed to electromagnetic waves by artificially controlling ventilation, humidity, and temperature by electronic products, and the harmful chemicals generated in cement are modern diseases such as atopy. It acts as a trigger.

In other words, natural materials that release substances beneficial to the human body due to the changed building materials are used, and as the amount of cement that releases harmful substances to the human body is increased, the residents are affected for a long time, resulting in harm to health.

More specifically, the concrete that forms the walls or floors of buildings and the plastering materials used for finishing them include cement. These cements provide excellent strength, but there is a problem in that toxic gas substances are contained in the materials, and recently, some of the wastes are mixed with cement and thus have problems with heavy metals.

In addition, in the case of simple mortar (plaster) which mixes cement, sand and water for finishing, the crack occurrence rate is high due to uneven drying or rapid drying, and such cracks not only lower the structural strength but also radon, which is a radioactive material from the outside. In order to solve this problem, cracks are suppressed by using a mixture of additives to solve this problem. Typical materials to be mixed include blast furnace slag powder and shrinkage reducing agents.

The blast furnace slag is a by-product produced in the blast furnace of the steelworks to improve the long-term strength of the cement is usually used by mixing a certain amount in the portland cement, it is relatively low heat of hydration can prevent cracking than the portland cement. In addition, desulfurization gypsum is mainly used as an anti-shrinkage agent, and the desulfurization gypsum is a kind of waste discharged after refining at a refinery or a thermal power plant. The main compound, CaO, is a sulfur compound containing sulfur dioxide generated during combustion of petroleum or coke. It contains a large amount.

However, desulfurized gypsum is self-heating, and the finishing time is about 5 ~ 6 hours in winter and about 2 ~ 3 hours in summer due to the mortar temperature formed around 15 ℃ in winter, 39 ℃ in summer, and 25 ℃ in spring and summer. In the spring and autumn seasons, it takes about 4 hours to reduce the finishing time of plastering, which is about 7 to 12 hours after the existing casting.In addition, the expansion of CaSO ₄ compensates for the volume reduction due to drying shrinkage. Can reduce cracks.

Therefore, as a shrinkage reducing agent used for mortar mortar, desulfurized gypsum is mainly used which is inexpensive and exhibits an excellent function in eliminating side effects (cracking, long time to finish plastering) due to high water / cement ratio.

Mortar that does not use the desulfurized gypsum is released through the cracks of radon gas, ammonia, heavy metals and floors or floors through severe cracks, causing other diseases such as atopic diseases. In addition, the crack preventing agent used in the market is a product that can not adsorb and deodorize toxic harmful substances such as radon, ammonia, heavy metals and sulfurous acid gas.

Thus, desulfurization gypsum is added to the cement composition for plastering or placing to prevent cracking by adding desulfurization gypsum as a shrinkage reducing agent (cracking prevention material) to prevent the decrease in structural strength, but it is discharged or cracked from sulfur dioxide or cement generated from desulfurization gypsum. There is no clear alternative for radon, ammonia and heavy metals introduced by

In the shrinkage reducing agent for cement mortar of Korean Patent Publication No. 10-2000-0024422 (published on May 6, 2000), combustion materials (sulphurized gypsum) combined with sulfides discharged from oil refineries are used for manufacturing mortar mortar without processing or refining process. It was.

Republic of Korea Patent Publication No. 10-2011-0004807 (published Jan. 14, 2011), 45-70% by weight of inorganic fibrous material (calcinite), 3-8% by weight of calcium sulfo aluminate, 3-8% by weight of desulfurized gypsum, silicate mineral 5 to 20% by weight, clay reinforcement material 5 to 20% by weight, and hydroxide additives 0.5 to 5% by weight to provide an inorganic fiber-based concrete crack reducing material composition.

In addition, the Republic of Korea Patent Registration No. 10-1143434 (registered on April 30, 2012) contains 20 to 50% by weight of alpha-type hemihydrate gypsum, 20 to 50% by weight quicklime and 20 to 50% by weight Hain, the hain is a waste catalyst A crack reducing material prepared by mixing and heating 1 to 10% by weight, 10 to 50% by weight red mud, 5 to 20% by weight of flue gas desulfurization gypsum, 30 to 70% by weight of waste concrete and 10 to 50% by weight of aluminum hydroxide was presented. .

The above-mentioned conventional case only shows the effect of preventing cracking, including desulfurized gypsum, and did not propose a countermeasure against harmful components emitted from sulfur dioxide or cement emitted from desulfurized gypsum.

In other words, existing crack reducing materials, including desulphurized gypsum, are mixed with finishing materials or cement to prevent cracking, thereby reducing the structural strength of the building.However, sulfur dioxide emitted from desulfurized gypsum or various types of cement are released. Since there is no alternative to block harmful components, it is necessary to study a new shrinkage reducing agent (crack preventing material) that can block harmful elements while preventing the occurrence of cracks.

The eco-friendly shrinkage reducing agent of the present invention and eco-friendly cement and mortar for plastering using the same,

Shrinkage reducing agent added to mortar provides an eco-friendly plastering shrinkage reducing agent for cement and mortar, which can block the release of harmful gases from sulfur dioxide as well as sulfur dioxide released from desulfurized gypsum by additional mixing of adsorbent components in addition to desulfurized gypsum. For the purpose.

Shrinkage reducing agent for environmentally friendly mortar of the present invention for achieving the above object,

Desulfurization gypsum 40 to 80% by weight, activated carbon 5 to 35% by weight, and adsorbent deodorant 2 to 35% by weight, the adsorption deodorant is selected from at least one of diatomaceous earth, zeolite, X-deo, gellite, soda ash. Can be.

The adsorption deodorant may be selected from one or more of the group consisting of diatomaceous earth, zeolite, X-deo, gel light and soda cycle. In addition, the adsorption deodorant comprises diatomaceous earth, zeolite, X-deo, gellite, 10 to 30% by weight of diatomaceous earth, 25 to 45% by weight zeolite, 25 to 45% by weight of X-deo, based on 100% by weight of adsorption deodorant, Gel light may be mixed in 10 to 25% by weight.

In addition, the plaster for cement contains 20 to 60 parts by weight of shrinkage reducing agent with respect to 100 parts by weight of ordinary portland cement in which blast furnace slag fine powder is mixed at 0.1 to 2% by weight.

In addition, the mortar for plastering includes 20 to 60 parts by weight of shrinkage reducing agent, 200 to 400 parts by weight of sand, and 40 to 80 parts by weight of water with respect to 100 parts by weight of ordinary portland cement in which blast furnace slag fine powder is mixed at 0.1 to 2% by weight. .

Environment-friendly shrinkage reducing agent of the present invention by the above-mentioned solutions and environmentally friendly cement and mortar using it,

Activated carbon and adsorption deodorant are mixed with desulfurized gypsum as a shrinkage reducing agent, and at least one of diatomaceous earth, zeolite, adsorbent (X-deo), gellite, and high carbon adsorbent is mixed with desorbent gypsum to prevent cracking effect of desulfurized gypsum. While providing, it is possible to adsorb and remove various types of harmful gas constituents emitted from desulfurized gypsum or cement or installing interior materials. In particular, before the cement, which is the initial curing state, is evaporated by the exothermic reaction of desulfurized gypsum, the condensation time is shortened.In the drying after condensation, the moisture absorbed from activated carbon or zeolite is gradually discharged to increase the drying time. It is possible to provide useful products that can improve the structural strength and block harmful gas emissions by inhibiting crack generation such as inhibiting cracking caused by drying to promote the health of users and contractors.

The present invention will be described in more detail with reference to the following examples. However, the embodiments are only illustrative of the contents and scope of the technical idea of the present invention, and the technical scope of the present invention is not limited or changed. In addition, it will be apparent to those skilled in the art that various modifications and changes can be made within the scope of the present invention based on these examples.

Eco-friendly plaster shrink reduction agent of the present invention comprises desulfurized gypsum 40 ~ 80% by weight, activated carbon 5 ~ 35% by weight, adsorbent deodorant 2 ~ 35% by weight, the adsorption deodorant diatomaceous earth, zeolite, X-deo It may be selected one or more from the group consisting of, gel light, soda cycle.

In addition, diatomaceous earth, zeolite, X-deo, gellite is selected as the adsorption deodorant, 10-30% by weight of diatomite, 25-45% by weight of zeolite, 25-45% by weight of X-deo, based on 100% by weight of adsorption deodorant, Gel light may be mixed in 10 to 25% by weight.

In addition, the shrinkage reducing material and cement may be mixed to prepare plastering, and the plastering cement may be a shrinkage reducing agent 20 to 60 based on 100 parts by weight of ordinary portland cement in which blast furnace slag fine powder is mixed at 0.1 to 2% by weight. It can be prepared by mixing parts by weight.

In addition, the mortar for plastering may be prepared by mixing cement and sand and water mixed with the shrinkage reducing agent, wherein the mixing ratio is about 100 parts by weight of ordinary portland cement mixed with 0.1-2% by weight of blast furnace slag powder. 20 to 60 parts by weight of a reducing agent, 200 to 400 parts by weight of sand, can be prepared by mixing 40 to 80 parts by weight of water.

Desulfurized gypsum mixed with the shrinkage reducing agent is used to inhibit cracking of cured plaster mortar, as well as to promote early strength and increase durability. Such desulfurized gypsum is produced through petroleum refining process, desulfurization process in cogeneration plant and thermal power plant, typically 55 to 65 wt% CaO, 0.1 to 5 wt% SiO _2, 0.1 to 3 wt% Al ₂ O ₃ , MgO It has a composition of 1 to 10% by weight, SO ₃ 15 to 40% by weight, Fe ₂ O ₃ 0.1 to 3% by weight, K ₂ O 0.01 to 0.3% by weight, V 0.01 to 0.3% by weight, and CaO is combined with a sulfur compound It contains a lot of forms.

The desulfurized gypsum is exothermic by the hydration reaction to produce ethringite (Ettringite; 3CaO · Al ₂ O ₃ · 3CaSO ₄ · 32H ₂ O to expand and strengthen the strength, 40 to the total amount of shrinkage reducing agent If it is supplied by weight% or less, the degree of expansion is low, water evaporation takes a long time, and after condensation, drying may proceed rapidly, causing cracks, and excessive ethrin when mixed with 80 wt% or more of the total amount of shrinkage reducing agent. It is preferable to use the mixture at the above ratio because cracks may occur due to increased expansion due to the formation of the guide, which may lower the strength.

The activated carbon is a carbon aggregate in which fine pores have been developed by containing charcoal, and the surface area can be changed by the activation process, and the adsorption and adsorption properties of adsorption with surrounding liquid or gas are enhanced by the carbon atom functional group therein. Has the nature. The activated carbon or charcoal also provides an adsorption and removal effect of harmful substances including sulfur oxides and ammonia, including sulfur dioxide emitted from cement or desulfurized gypsum. In addition, the activated carbon and charcoal is made to absorb moisture in the production of mortar, and during the drying process after the condensation of the mortar made by the plastering process to gradually discharge the moisture absorbed to increase the drying time to suppress the occurrence of cracking by rapid drying.

When activated carbon or charcoal is mixed in an amount less than 5% by weight based on the total amount of shrinkage reducing agent, the drying delay effect due to water discharge during curing and the removal of harmful substances are lowered, and when the mixing amount is more than 35% by weight, the drying delay effect It is preferable to use the mixture in the above range because the degree of enhancement of is insufficient.

Next, the adsorbent deodorant added to the shrinkage reducing agent is contained in 2 to 35% by weight. The adsorption deodorant may be selected by mixing at least one of diatomaceous earth, zeolite, X-deo, gel light, slaked lime. Preferably, diatomaceous earth, zeolite, X-deo, gellite is selected to 10 to 30% by weight of diatomaceous earth, 25 to 45% by weight of zeolite, 25 to 45% by weight of X-deo and 10 to 10% by weight of adsorbent deodorant. To 25% by weight.

The diatomaceous earth is an aggregate of sediments composed of floating algae shells called diatome having an average size of 50 to 100 micrometers, mostly composed of amorphous silica. The diatomaceous earth is a supersporous material having fine pores of about 5,000 times the size of activated carbon and filtering particles contaminated through the micropores. The diatomaceous earth provides adsorption and deodorization functions to maintain humidity or remove odors through micropores . In addition, diatomaceous earth emits far infrared rays and anions, has adiabatic soundproofing effect, and adsorbs and decomposes formaldehyde and VOC (volatile organic compounds). Therefore, adsorption and removal of fine particles not removed from activated carbon are continuously performed, and the efficiency of removal of harmful components such as adsorption and decomposition of formaldehyde or VOC, which is a cause of sick house syndrome, is continuously increased.

When the diatomaceous earth is mixed in an amount of 10 wt% or less with respect to the adsorbent deodorant mixture amount, the removal efficiency of harmful components is lowered. When mixing at 30 wt% or more, it is preferable to use the diatomaceous earth in the above range because the removal efficiency of harmful components is insufficient. Do.

The zeolite is a silicate mineral, and the structural bonds of the atoms of the crystals are loose, and even though the moisture filling the spaces is released at high heat, the skeleton is still maintained, and other particulates can be adsorbed into the inner space. In particular, zeolite has excellent deodorizing effect and adsorption effect, so it removes and adsorbs harmful sulphate gas emitted from desulphurized gypsum or cement. In addition, due to the absorbency of the zeolite, when used as a shrinkage reducing agent of the mortar, it is possible to suppress the occurrence of cracks due to rapid drying by delaying the drying time by continuously releasing moisture inside the zeolite without decreasing the strength in the drying process after the mortar is condensed.

When the zeolite is mixed in an amount of 25 wt% or less with respect to the adsorbent deodorant mixture, the effectiveness of the removal of harmful components and the effect on drying delay is low. When the mixture is mixed at 45 wt% or more, the removal efficiency and drying delay effect of the harmful components are insufficient. Therefore, it is preferable to use the mixture in the above range.

Ge-lite is called pozzolanic, and contains about 2.0 ppm of germanium, and contains a large amount of far infrared rays and anions, and typically includes volcanic ash, silicate, silicate, and the like. That is, the gelite emits far infrared rays corresponding to about 180 times of the yellow soil, promotes plant growth, has a humidity control function, emits negative ions and human active energy, has a harmful electromagnetic wave blocking function, deodorizing and sterilizing effect and It also provides a heavy metal neutralization effect. The gelite acts as an adsorbent like the previous mixture to adsorb and remove harmful components emitted from desulfurized gypsum and cement, blocks radioactive substances such as radon and electromagnetic waves, and removes odorous components such as ammonia. In addition, it is less effective than activated carbon or zeolite, but it has a humidity control function, and it also provides the effect of suppressing cracking caused by rapid drying by increasing the drying time by continually discharging moisture in the process of curing mortar.

When the gellite is mixed in an amount of 10 wt% or less with respect to the amount of adsorbent deodorant, the harmful ingredients are reduced or far infrared ray emission and harmful propagation blocking efficiency are reduced. It is preferable to mix and use in the said range because increase is insignificant.

The X-deo (brand name; manufacturer-BK Co., Ltd.) is an adsorbent prepared by Patent Registration No. 10-1059387, and mixed by stirring 5 parts by weight of phosphoric acid source of 60 ~ 90% concentration to 100 parts by weight of dry crushed purified sludge. 60 to 90% by weight of phosphate powder having a double-porous cylindrical structure of 100-200 mesh, which is aged by stirring for 10 to 30 hours and heated at 200 to 300 ° C for 5 to 15 hours. It is a powdered sulfuric acid substance having a 100-200 mesh double-porous cylindrical structure which is stirred by stirring and mixing 5 parts by weight of sulfuric acid source of concentration for 10 to 30 hours, and then aged at 200 to 300 ° C for 5 to 15 hours. The powdered phosphate material and the powdered sulfuric acid material are adsorbents having a hardness of 92% or more and a powdered phosphate material and the powdered sulfuric acid material mixed in a weight ratio of 55:45.

The X-deo has a specific surface area of 2 to 4 times higher than that of activated carbon, and effectively acts on various types of odor removal gases such as ammonia, hydrogen sulfide, amines, and aldehydes, such as desulfurized gypsum or cement of the shrinkage reducing agent of the present invention. It is to increase the adsorption removal efficiency for the harmful components discharged.

When the X-deo is mixed in an amount of 20% by weight or less with respect to the adsorbent deodorant mixture, the removal efficiency of harmful components is lowered. When mixing at 60% by weight or more, the use of the X-deo in the above range is insufficient. desirable.

In addition, the shrinkage reducing agent of the present invention may further include a high carbon adsorbent, and a representative high carbon adsorbent may use a liquid amine or powdered soda ash. Since the liquid amine has a considerably high carbon dioxide absorption efficiency but generates odor, it is preferable to use soda ash in the present invention. Soda ash (sodium carbonate), which is a high carbon adsorbent, does not produce odor and provides a carbon dioxide adsorption efficiency close to amine, and improves the curing time and initial strength during mortar production. When soda ash, such as a high carbon adsorbent, is mixed in an amount of 4% by weight or less relative to the total amount of adsorbent deodorant, it is insufficient in adsorption efficiency, curing speed, and initial strength enhancing effect. It is desirable to provide a carbon dioxide adsorption function and a strength enhancing effect by suppressing cracking by mixing with.

In addition to the desulphurized gypsum as a composition constituting the shrinkage reducing agent, including a component having a plurality of adsorptive properties with the effect of inhibiting the occurrence of cracks by continuously discharging moisture absorbed during the curing process of the prepared mortar to delay the drying time It is to provide an adsorption removal function for various harmful components including sulfur oxides such as sulfurous acid gas and hydrogen sulfide. In other words, it is possible to provide a comfortable living environment to residents by enabling the response to a variety of components from small to large harmful ingredients to particle size.

As the composition ratio of the shrinkage reducing agent, any one or two of 40 to 80% by weight of desulfurized gypsum and 20 to 60% by weight of the remaining amount of diatomaceous earth, zeolite, X-deo, gellite, and high carbon adsorbent, which are activated carbon or adsorption deodorant It can mix above.

In addition, the composition of the shrinkage reducing agent is to supply desulfurized gypsum and the adsorption efficiency of sulfite gas generated from the desulfurized gypsum with the activated carbon as the basic mixed component, and the diatomaceous earth, zeolite, X-deo, gel light, high carbon Any one or two or more of the adsorbents may be further mixed with the adsorbent deodorant. At this time, the composition ratio of desulfurized gypsum 40 ~ 80% by weight, activated carbon 5 ~ 35% by weight, adsorption deodorant 2 ~ 35% by weight.

In addition, the composition of the shrinkage reducing agent may be based on desulfurized gypsum and activated carbon as a basic mixed component, and by using diatomaceous earth, zeolite, X-deo, and gellite as an adsorption deodorant, it may provide the adsorption and deodorization effect of various harmful components. . At this time, the composition ratio is 40 to 80% by weight of desulfurized gypsum, 5 to 35% by weight of activated carbon, and 2 to 35% by weight of adsorbent deodorant, and the adsorption deodorant is 10 to 30% by weight of diatomaceous earth and 25 to zeolite to the total amount of adsorption deodorant. 45% by weight, 25% to 45% by weight of X-deo, and 10% to 25% by weight of gellite.

Plastering cement of the present invention is used by mixing the above-mentioned shrinkage reducing agent with cement. The plaster for cement is prepared by mixing 20 to 60 parts by weight of shrinkage reducing agent with respect to 100 parts by weight of ordinary portland cement in which blast furnace slag fine powder is mixed at 0.1 to 2% by weight.

The blast furnace slag can improve the long-term strength while providing a strength similar to cement by reducing the amount of cement, it is effective in preventing cracks with low alkali. In the present invention, a small amount of blast furnace slag fine powder is mixed and used to compensate for the long-term decrease in strength which may be reduced by the shrinkage reducing agent mixing. When the blast furnace slag fine powder is mixed below the above-mentioned range, the strength-promoting effect is insignificant, and when it is mixed above, it may be adversely affected by crack suppression due to excessive rapid coagulation.

In addition, the mortar for plastering was mixed by mixing 20 to 60 parts by weight of shrinkage reducing agent, 200 to 400 parts by weight of sand, and 40 to 80 parts by weight of water with respect to 100 parts by weight of ordinary Portland cement, in which the fine blast furnace slag powder was mixed at 0.1 to 2% by weight. It can manufacture.

The sand is preferably used as a coarse yarn having a mito powder content of less than 3% (0.08mm sieve passing rate) having a granulation rate of 2.8 ~ 3.0, limiting the use of fine yarn having a granulation rate of less than 2.5, but having a granulation rate of 1.5 or more. Seisagi can also be used.

Use uncontaminated water as the water to be mixed, especially acid contaminated water. When the mixed amount of water is mixed above the above range, clogging or rupture of the pressure hose or pipe may occur in a material separation shape, and the volume decrease phenomenon may increase the unevenness of the construction surface or increase the incidence of cracking. There is a problem that the work speed is delayed due to the bad water flow occurs to the lower side.

In addition, when the water mixing amount is less than the above range, the load is largely generated in the mortar pumping, the pipe and the hose may be ruptured, and the flattening work is not easy, so mixing the water within the above range to produce mortar It is preferable.

In addition to the mortar, an air entrainer, a water reducing agent, or a thickener commonly used as a plaster may be added in an amount of 0.1 to 1 parts by weight based on 100 parts by weight of cement.

Hereinafter, the construction method will be described.

1. Material condition of mortar

1) Eco-friendly shrink reduction agent

The mortar has a high water / cement ratio of about 70% on average, which does not form water-tightened spheres, leading to the formation of capillaries, resulting in many cracks.

Eco-friendly shrinkage reducing agent should have an exothermicity to quickly remove excess water that can not be removed only by absorbing and evaporating the bubble layer as well as expandability to compensate for volume reduction proceeding as the mortar sphere is dried.

Eco-friendly mortar mortar is composed of 100% by weight of desulfurized gypsum and 20% by weight of activated carbon, charcoal, diatomaceous earth, zeolite, X-deo, gelite, high carbon adsorbent and other ores. It usually takes about 4 hours to finish the plastering, and cracks are generated within about 5cm per 1m ² , which is good in suppressing cracking.

2) Class 1 cement

  Currently, 1 type of cement produced in Korea is suitable for KS standards even if mixed materials of less than 5% are mixed. Therefore, the mixing ratio of blast furnace slag fine powder used as the main mixing material for each production company is different.

According to the field observation, cracks of about 16.74 cm / m ² or more were generated when the type 1 cement containing blast furnace slag powder content exceeding 2% by weight was used. scene and August 10 of about 40 ~ 60cm / m're also cases occurred many cracks a construction haenyeon late August - early September, per ² hanba construction manufactures Broadcasting & Telecommunications mortar by changing one kind of cement to less than 2% Goods 2012 As of November 20th, 2.5 months have been maintained.

Based on the above cases, it is judged that one kind of cement used for mortar mortar should use pure one kind of cement or a product containing 2% or less of blast furnace slag powder.

3) sand

The sand used for mortar mortar has a fine-grained sand with a mito powder content of 3% or less (pass rate of 0.08m / m sieve) with a high 2.8 ~ 3.0 granulation rate and a fine chuck sanding rate of less than 2.5. You should not use a tax company, and if it is inevitable, detailed technical guidance and consultation are required.

4) water

In principle, water should be clean and uncontaminated. In particular, water contaminated with acid should never be used.

5) Desulfurized Gypsum

Advantages-exothermic, dilatation; The surplus water of mortar, which uses high water / cement ratio, can be removed quickly, and because of its expansiveness due to gypsum, which is the main component, it compensates for volume reduction due to dry shrinkage and reduces cracking.

Disadvantages-It is a waste discharged during the desulfurization process of oil refineries, thermal power plants and steel mills, and therefore contains a large amount of sulfurous acid gas and harmful components.

2. Environmental conditions

1) Whether to install window to block wind speed

According to the research results, there is no measure to prevent the initial cracking under the condition that wind speed of 2.5m / Sec or more is applied after mortar casting. As a result, most of them are equipped with windows for blocking wind speed. If the windows are not installed, the air bubbles should be deflected before construction and sprinkled curing after construction.

2) Seasonal regional differences

a) seasonal climate differences

Most of the mortar casting process is from early March to the end of November, and the most careful time is the cold season from late June to the end of August. At this time, the condensation of mortar proceeds very fast according to the high temperature, so the working method needs to be changed accordingly.

For example, it is advisable to change the order of plastering in the order of pusting, punishment, finishing, and handing at the same time as pouring, and then change the order of pusting + finishing, finishing, and handing at the same time.

In particular, the bubble shrinking worker should work closely with the plastering team on the day of the blast-casting to ensure the optimal water retention, and whether or not the proper bubble shrinkage will affect the initial plastering quality (surface finishing, plastic shrinkage crack prevention).

b) regional differences in climate;

Due to the topographical effects, the windbreaking process must be preceded by the wind-blocking process in dry and windy weather conditions in windy areas (seasides) and in Yeongnam region from late autumn to early spring. It must be accompanied to ensure good quality of communication.

3. Construction condition

1) Whether to carry out proper bubble water accumulation before construction

Bubble water accumulation should change the wind effect depending on the dry condition of the bubble layer, wind effect, foam material, season, and building direction, so it is necessary to equip watering equipment, work closely with plasterer, and timely drop water in place. Professionally trained technicians should be consistently carried out from start to finish.

2) Use of proper water / cement ratio

Due to its characteristics, mortar mortar has to be thinly constructed in large area (about 40mm) and high water / cement ratio (average of 70%) is used for pump pumping.

If you use too high water / cement ratio,

a) Material separation phenomenon may cause clogging or rupture of the pressure hose or pipe.

b) The volume reduction phenomenon is intensified, making it difficult to secure a flat plastering surface and to secure a target level (uneven and much lower than the target level).

c) As the water trap of excessive surplus water flows to the lower side, it takes a lot of time to remove it, and it causes inoperability or interruption due to mismatch of casting speed and plastering speed.

d) Plaster shrinkage occurs at the high surface and low, so that the accumulated water forms a latent layer, resulting in poor plaster quality specimens.

Also, if you use too low water / cement ratio

a) The load is heavy and eventually the pipe or hose ruptures.

b) Since mortar does not spread, pus work is impossible and work is stopped.

Accordingly, the water / cement ratio should be changed according to the construction thickness, but the use of the water / cement ratio should be as low as possible to ensure excellent plastering quality.

3) Whether or not to perform plastering at the proper time due to water drainage

a) Do not miss the scale in the field terminology.

b) The quality of plastering depends entirely on the good and bad of the scales.

c) The floor plastering process should be performed evenly over time (one on the one and the other on the water), so that the plastering can proceed sequentially according to the pouring order. Can be improved.

4. Whether to perform proper curing after construction

In principle, in case of mortar containing expandable shrinkage reducing material, wet curing is carried out for 7 days when 70% of its original property is demonstrated. In addition, if the board is damaged after 3 ~ 4 days of pouring, the process of lifting the material is started. In the beach area where wind speed is high, spraying and curing should be performed at least twice to minimize the phenomenon of overturning of the surface by the difference of drying speed between the surface and the back, and to minimize the drying shrinkage crack due to rapid drying. .

Environment-friendly explosion-proof mortar shrinkage reducing material according to the present invention can realize the desired quality when the above conditions are properly equipped as described above, generally divided into product production-sales-AS to improve the unclear material responsible for defects This is characterized by unifying production, sales, field management, and AS to maintain the final quality consistently and enable fast AS.

Hereinafter, the performance of the shrinkage reducing agent and the mortar using the same according to the present invention was evaluated through the experiment.

1. Determination of shrinkage of mortar and removal rate of harmful substances according to the mixing ratio of desulfurized gypsum and activated carbon of shrinkage reducing agent

Mortar was prepared by mixing with a conventional mixing ratio of 100kg of cement, 250kg of sand, 45kg of water, 40kg shrinkage reducing agent.

At this time, the shrinkage reducing agent was prepared by mixing desulfurized gypsum and activated carbon, the mixing ratio was changed as shown in Table 1 below.

Manufactured mortar

Experimental Example 1) Compressive strength measurement-Compressive strength of the 28-day specimen was measured according to the measurement method of KSL 5105 (Test method for compressive strength of hydraulic cement mortar).

Experimental Example 2) Measurement of length change-According to the measurement method of KS F 2424 (mortar or concrete test method of length change), the length change of the specimens was measured for 28 days using a 5 × 100 × 10 mold and a datalogger.

Experimental Example 3 Determination of the detection of sulfurous acid gas-commercially produced each of the commercial thickness of 150mm in width 50mm with the mortar, and put the prepared commercially in a closed chamber (200 × 200 × 200) and left for 7 days while maintaining 28 ℃ Then, it was measured whether sulfur dioxide (SO ₂ ) detection using a measuring device.

Compression strength and length change of the Experimental Examples 1 to 3 and the measurement results of sulfur dioxide detection are shown in Table 1 below.

[Table 1]

As shown in Table 1, it can be seen that the larger the amount of desulfurized gypsum is, the higher the compressive strength and the dry shrinkage are, and when the desulfurized gypsum is mixed at less than 16 kg, the shrinkage of the compressive strength increases as the dry shrinkage increases. In addition, it can be seen that the sulfur dioxide concentration is significantly lowered when the mixture of activated carbon is 8 kg or more.

Therefore, the shrinkage reducing agent is preferably mixed at a ratio of 40 to 80% by weight of desulfurized gypsum and 20 to 60% by weight of the adsorbent.

2. Measurement of shrinkage reduction and compressive strength according to the mixing ratio of shrinkage reducing agent of mortar

100 kg of cement, 250 kg of sand, and 45 kg of water were mixed in the same amount, and the shrinkage reducing agent was prepared by changing the input amount to 0, 10, 15, 20, 40, 50, 60, 70, 80, 100 kg, and mortar was prepared. It is shown in Table 2 below.

At this time, the shrinkage reducing agent was prepared by mixing desulfurized gypsum and activated carbon in a 6: 4 ratio.

Manufactured mortar

Experimental Example 4) Compressive Strength Measurement-Compressive strength was measured by the same method as the measuring method of Experimental Example 1.

Experimental Example 5) Measurement of length change-The length change was measured by the same method as Experimental Example 2 above.

Compression strength and length change results of Experimental Examples 4 and 5 are shown in Table 2 below.

[Table 2]

As shown in Table 2, when the mixing amount of the shrinkage reducing agent is 15 kg or less, it can be seen that the compressive strength decreases due to an increase in the dry shrinkage length, and when the mixing amount of the shrinkage reducing agent is 70kg or more, the result is expanded. It is believed that the compressive strength is lowered due to the decrease in cement bonding strength due to the increase in cracking and expansion of shrinkage reducing agent due to expansion.

Therefore, the shrinkage reducing agent is preferably mixed with 20 to 60 parts by weight relative to 100 parts by weight of cement.

3. Measurement of Mortar Property Changes and Hazardous Substance Removal Rate According to the Change of Adsorbent Type of Shrinkage Reducing Agent

Mortar was prepared by mixing 100 kg of cement, 250 kg of sand, 45 kg of water, and 40 kg of shrinkage reducing agent.

The shrinkage reducing agent was fixedly mixed with desulfurized gypsum at 24 kg, and the activated carbon or adsorption deodorant was mixed with 16 kg, but the activated carbon and the adsorbent deodorant diatomaceous earth, zeolite, X-deo, and gellite were mixed at the mixing ratios of the following Table 3.

[Table 3]

Manufactured mortar

Experimental Example 6) Compressive Strength Measurement-The compressive strength of the 3rd, 7th, and 28th day of the aging was measured by the same method as the measuring method of Experimental Example 1.

Experimental Example 7 Measurement of Length Change-The length change was measured in the same manner as in Experimental Example 2.

Experimental Example 8 Determination of the detection of sulfur dioxide (SO ₂ )-The detection of sulfur dioxide by the same method as in Experiment 3.

Experimental Example 9 Determination of Ammonia Detection-Whether ammonia was detected by the same method as Experimental Example 3 was measured.

Experimental Example 10 Measurement of Hydrogen Sulfide Concentration-A specimen prepared according to the same specification as Experimental Example 3 was placed in a closed chamber (200 × 200 × 200), and hydrogen sulfide was injected to set the hydrogen sulfide concentration to 0.20 ppm. After 7 days at 28 ℃ hydrogen sulfide concentration was measured.

Experimental Example 11 Measurement of Formaldehyde Concentration Change-It proceeded in the same manner as in Experimental Example 10, but instead of hydrogen sulfide, formaldehyde was injected and the concentration thereof was measured.

The measurement results of Experimental Examples 6 to 11 are shown in Table 4 below.

[Table 4]

As shown in Table 4, it can be seen that in the dry shrinkage, good results are obtained in both the mixed activated carbon and the adsorbent deodorant.

At 28 days of compressive strength, the highest compressive strength was shown in Comparative Example 1, in which the activated carbon and the adsorbent deodorant were not mixed. Therefore, when the activated carbon was mixed, the compressive strength was relatively decreased.

However, in Examples 1 and 3 in which the activated carbon and zeolite are mixed in the mixture, the compressive strength is large, and among them, the zeolite exhibits a higher compressive strength, which indicates that the compressive strength varies depending on the type of adsorbents to be mixed.

Examples 1 and 3 show a higher compressive strength than the other examples, which means that the compressive strength is higher than that of the other examples in the age of 3 days and the strength of 7 days, thereby minimizing the occurrence of cracks and increasing the strength. In other words, activated carbon and zeolite release the moisture absorbed in the drying process during condensation and delay the drying time to suppress the occurrence of cracking due to rapid drying, and thus improve the strength. Therefore, it can be seen that the drying delay effect is provided according to the hygroscopicity of the mixture.

The sulfur dioxide concentration was undetected in Examples 1 and 3, and a small amount was detected in Examples 4 and 2, and in Example 5 in which gelite was mixed, it was lower than Comparative Example 1 in which activated carbon or adsorbent deodorant was not mixed. Only a significant amount was detected. Therefore, activated carbon and zeolite have a great effect on the adsorption and removal of sulfurous acid gas, and also provide some effect in X-deo and diatomaceous earth, and gelite has relatively low sulfur dioxide removal efficiency.

The ammonia concentration was not detected in Examples 1, 2, and 4, and a small amount was detected in Examples 3 and 5. It can be seen that ammonia is effectively removed from activated carbon, diatomaceous earth and X-deo.

In the hydrogen sulfide concentration, it can be seen that the high adsorption removal rate is shown in Example 4, and the adsorption removal is performed in the order of Example 1, Example 3, and Example 2 Example 5. That is, hydrogen sulfide shows a large removal efficiency in X-deo, and it can be seen that the adsorption removal is performed to some extent in other activated carbon and adsorption deodorant.

Formaldehyde concentration showed a large removal efficiency in Example 2 and Example 4, the removal efficiency was also excellent in Example 1 and Example 5, the removal efficiency was relatively low in Example 3.

In addition, the formaldehyde concentration measurement test was further performed using the test specimens of Example 2 and Example 4 through Experimental Example 12.

Experimental Example 12) The specimens of Example 2 and Example 4, which carried out Experimental Example 11, were put back into the closed chamber and formaldehyde was injected to set the formaldehyde concentration to 0.20 ppm, and then left at 28 ° C. for 7 days. Formaldehyde concentration was measured.

In addition, formaldehyde concentration was not detected in Example 2 and 0.08 ppm was detected in Example 4 as a result of the measurement of Experimental Example 12. This is because the diatomaceous earth, the adsorption deodorant of Example 2, decomposes the adsorbed formaldehyde, so that the adsorption is possible. However, X-deo of Example 4 is considered to have an adsorption limit due to simple adsorption.

In summary, the delayed drying effect of activated carbon and adsorbent deodorant is much higher in activated carbon and zeolite, but zeolite has excellent initial strength and medium strength. It can also provide the strength of drying delay while complementing the strength.

In addition, sulfurous acid gas has a large removal efficiency in activated carbon and zeolite, ammonia has a large effect on activated carbon, diatomaceous earth, X-deo, hydrogen sulfide has a large effect on X-deo. In addition, formaldehyde has a large removal efficiency in diatomaceous earth and X-deo, and diatomaceous earth provides continuous adsorption by adsorbing and decomposing formaldehyde.

In addition, gellite has a lower adsorption efficiency than other activated carbons or adsorption deodorizers, but gellite itself does not reduce mortar strength by providing functions of neutral metal neutralization, electron blocking, and cement toxicity neutralization which are not provided by other adsorption deodorants. Can be used in combination to add additional functionality.

4. Determination of Activated Carbon Mixing Ratio for Desulfurized Gypsum

Mortar was prepared by mixing 100 kg of cement, 250 kg of sand, 45 kg of water, and 40 kg of shrinkage reducing agent.

The mixing ratio of the shrinkage reducing agent is fixed to 24 kg of desulfurized gypsum, and the activated carbon is increased or decreased by 2 kg by 0 to 16 kg, and the remaining amount is filled with gellite having low sulfite adsorption performance as shown in Table 5 below.

Detection of sulfur dioxide was performed using mortar prepared with different amounts of activated carbon.

Experimental Example 13 Determination of Detection of Sulfur Dioxide (SO ₂ )-The detection of sulfur dioxide using mortar prepared with different amounts of activated carbon by the same method as Experimental Example 3 was shown in Table 5 below.

[Table 5]

As shown in Table 5, it can be seen that sulfur dioxide can be effectively removed by mixing more than 2 kg of activated carbon with respect to 24 kg of desulfurized gypsum.

That is, since sulfur dioxide can be removed by mixing more than 1/12 of the amount of desulfurized gypsum, activated carbon may be mixed in an amount of 5 to 10% by weight when the desulfurized gypsum mixed with a shrinkage reducing agent is mixed at 40 to 80% by weight. . However, in order to obtain drying delay due to moisture absorption of activated carbon or other deodorizing effect, it may be mixed up to 35% by weight.

In addition, the minimum amount of activated carbon compared with the basic desulfurized gypsum is mixed to a minimum, and the remaining amount is mixed with any one or two of the above-mentioned adsorption deodorant diatomaceous earth, zeolite, X-deo, and gelite, so that each adsorption deodorant has It can provide additional effects according to physical properties.

5. Measurement of Adsorption Deodorant Mixing Ratio

Mortar was prepared by mixing 100 kg of cement, 250 kg of sand, 45 kg of water, and 40 kg of shrinkage reducing agent.

Shrinkage reducing agent was prepared by fixed mixing with desulfurized gypsum 24kg, activated carbon 4kg, and the adsorption deodorant diatomaceous earth, zeolite, X-deo, gellite within 12kg range.

The diatomaceous earth is excellent in ammonia adsorption deodorization, ammonia adsorption deodorization is also provided to some extent in X-deo and activated carbon, so it is mixed in 0.5, 1, 2, 3 kg based on 2kg, a range smaller than the amount of activated carbon This was done and the varying increments were controlled by mixing in gelite.

The zeolite provides a sulfur dioxide adsorption and removal effect similar to activated carbon, has a water discharge function during drying, and provides an effect of maintaining strength even when water is discharged, based on 4 kg of the same range as activated carbon 3 Mixing was performed at 4, 5, and 6 kg, and the changing increments were controlled by mixing in gelite.

The X-deo is able to cope with various kinds of harmful components such as adsorption or deodorizing power for ammonia, hydrogen sulfide, aldehyde, etc., based on the same range of activated carbon 4kg, 3,4,5,6kg Each mixing was performed, and the changing increments were controlled by mixing in gelite.

The mixed composition ratios are shown in Table 6 below.

TABLE 6

Experimental Example 14 Determination of Detection of Sulfur Dioxide (SO ₂ ) -By using the same method as Experimental Example 3, it was measured whether sulfur dioxide was detected by mortar mixed with a shrinkage reducing agent having a composition ratio of Examples 6 to 15.

Experimental Example 15 Determination of Ammo and Detection-The ammonia was detected by mortar mixed with a shrinkage reducing agent having a composition ratio of Examples 6 to 16 by the same method as Experimental Example 3.

Was measured in Example 6 to Example 15 nongdoeul hydrogen sulphide in the same manner as in the Experimental Example 10 by using a mortar and a shrinkage reducing agent mixed with the composition ratio of the Experimental Example 16) Hydrogen sulfide concentration in the measurement.

Experimental Example 17 Determination of Formaldehyde Concentration Change-It proceeded in the same manner as Experimental Example 16, but instead of hydrogen sulfide, formaldehyde was injected and the concentration thereof was measured.

The measurement results of Experimental Examples 14 to 17 are shown in Table 7 below.

[Table 7]

As shown in Table 7, sulfur dioxide and ammonia were not detected in Example 6, which is a reference value, and hydrogen sulfide and formaldehyde were also measured to be good values.

In the case of diatomaceous earth, as shown in Examples 6 to 9, it can be seen that when mixed at 0.5 kg, the formaldehyde concentration is high, and at 1 kg or more, it provides a good adsorption and removal ability. This deficiency can be seen.

Therefore, it can be seen that the diatomaceous earth effectively removes formaldehyde concentration when mixed with 1 to 3 kg of desulfurized gypsum 24 kg. The 1 ~ 3kg of diatomaceous earth corresponds to 10 to 25% by weight based on the total amount of the adsorption deodorant (12kg), 10 to the total amount of the adsorption deodorant, such as a small amount of diatomaceous earth can be added to improve the removal reliability of formaldehyde. It is preferable to mix in the range of 30 weight%.

In the case of zeolite, as shown in Examples 6 and 10 to 12, it can be seen that the adsorption deodorization removal rate of sulfur dioxide or ammonia does not decrease even when the mixing amount is changed, and the hydrogen sulfide concentration decreases as the mixing amount increases. In addition, as shown in Example 1 (activated carbon) and Example 3 (zeolite) of Table 4, it can be seen that it provides an effect of strengthening the initial and middle strength in the curing process.

The zeolite has a slight change in the hydrogen sulfide concentration at 3 kg and a large change occurs at 4 kg or more, and at 5 kg or more, there is no significant change in the hydrogen sulfide concentration reduction.

Thus, the zeolite may be mixed with 3 ~ 5kg compared to 24kg of desulfurized gypsum, which corresponds to 25 to 45% by weight relative to the total amount of adsorption deodorant (12kg).

In the case of X-deo, as shown in Examples 13 to 15, the hydrogen sulfide is weakly removed when mixed at 3 kg, but the concentration is significantly changed from 4 kg, and the hydrogen sulfide concentration decrease is less than 5 kg. In addition, it can be seen that even in the formaldehyde concentration, a large concentration reduction is achieved at 4 kg or more.

Therefore, mixing 3 to 5 kg with respect to 24 kg of desulfurized gypsum can reduce hydrogen sulfide and formaldehyde concentration, which corresponds to 25 to 45 wt% of the total amount of adsorbent deodorant (12 kg).

In the case of gellite, as shown in Example 5 of Table 4, the adsorption deodorization of sulfite gas, ammonia, hydrogen sulfide formaldehyde, etc. provides the lowest efficacy than other adsorption deodorizers, but the effects of cement poisoning, electromagnetic wave blocking, heavy metal neutralization, etc. Since it is provided, it can mix in the range which does not affect mortar strength.

In the present invention is mixed in the range of 1 ~ 3kg of gellite with respect to 24kg of desulfurized gypsum, which corresponds to about 10 to 25% by weight relative to the total amount of adsorption deodorant (12kg).

6. Performance measurement according to type of adsorbent deodorant

Mortar was prepared by mixing 100 kg of cement, 250 kg of sand, 45 kg of water, and 40 kg of shrinkage reducing agent.

Shrinkage reducing agent was prepared by fixed mixing with desulfurized gypsum 24kg, activated carbon 4kg, and the adsorption deodorant diatomaceous earth, zeolite, X-deo, gellite within 12kg range.

At this time, any one or two or more of diatomaceous earth, zeolite and X-deo were selected and mixed, and the mixing ratio of diatomaceous earth: zeolite: X-deo: gelite of Example 6 was mixed 1: 2: 2: 1. (The most effective noxious gas removal efficiency was shown in Example 6, and the measured compressive strength was well represented as 326kgf / cm ² , which was adopted as a mixing ratio standard between the components.)

For example, when diatomaceous earth and zeolite were mixed, the mixture was mixed from 12 kg of diatomaceous earth to 4 kg of diatomaceous earth and 8 kg of zeolite according to the ratio of 1: 2. In addition, in the case of selecting three types of diatomaceous earth, zeolite and X-deo, the mixture was mixed from 12 kg of diatomaceous earth to 2.4 kg, zeolite 4.8 kg and X-deo 4.8 kg according to the ratio of 1: 2: 2.

The mixed composition ratios are shown in Table 8 below.

[Table 8]

Experimental Example 18 Measurement of Sulfur Dioxide (SO ₂ ) Detection-By using the same method as Experimental Example 3, it was measured whether sulfur dioxide was detected by mortar mixed with a shrinkage reducing agent having a composition ratio of Examples 16 to 29.

Experimental Example 19 Determination of ammonia and detection-Whether ammonia was detected by mortar mixed with a shrinkage reducing agent having a composition ratio of Examples 16 to 29 by the same method as Experimental Example 3 above.

Experimental Example 20 Measurement of hydrogen sulfide concentration change-Hydrogen sulfide concentration was measured in the same manner as in Experimental Example 10, using mortar mixed with a shrinkage reducing agent having a composition ratio of Examples 16 to 29.

Experimental Example 21 Determination of Formaldehyde Concentration Change-It proceeded in the same manner as Experimental Example 20, but instead of hydrogen sulfide, formaldehyde was injected and the concentration thereof was measured.

Experimental Example 22) Compressive Strength Measurement-Compressive strength was measured for 28 days using mortar mixed with a shrinkage reducing agent having a composition ratio of Examples 16 to 29 in the same manner as in Experimental Example 1.

The measurement results of Experimental Examples 18 to 22 are shown in Table 9 below.

TABLE 9

As shown in Table 9, sulfur dioxide was not detected in Examples 16 to 29 by adding activated carbon (4 kg) capable of removing sulfite gas discharged from desulfurized gypsum (24 kg).

Ammonia had low detection concentration because activated carbon was included in all examples, and was not detected in the example where X-deo was further mixed. In addition, even in the example in which only diatomaceous earth was mixed without X-deo, ammonia was detected slightly weaker than the example in which other adsorbent deodorizers were mixed, and when the whole amount of diatomaceous earth was mixed as in Example 16, ammonia was not detected. Therefore, it can be seen that ammonia has an effective removal rate when the mixed amount of X-deo and / or diatomaceous earth is 4 kg or more.

In addition, hydrogen sulfide showed a low detection concentration in the example in which X-deo was mixed, and thus high removal rate, and ammonia detection concentration was relatively low in the example in which zeolite was mixed. In other words, hydrogen sulfide has a significantly lower detection concentration when the amount of X-deo is mixed at 6 kg or more, and when mixed with zeolite, hydrogen sulfide removal rate can be maintained even if the amount of X-deo is mixed.

Next, formaldehyde had a low detection concentration in the embodiment in which diatomaceous earth and X-deo were mixed, and when the amount of diatomaceous earth and / or X-deo mixed was 6 kg or more, it can be seen that a great effect was obtained in formaldehyde removal.

In contrast to Example 1 in which only desulfurized gypsum and activated carbon were mixed as a shrinkage reducing agent and an example of adsorbent deodorant mixed with desulfurized gypsum and activated carbon,

Example 16, in which diatomaceous earth was further mixed, showed a higher hydrogen sulfide concentration, but a lower formaldehyde concentration.

-Example 17 in which zeolite is further mixed, but the overall efficiency is slightly lower, but due to the nature of the zeolite discharged moisture during the drying process to suppress the cracks it can be seen that the initial and intermediate strength during curing as shown in Table 4.

Example 18 in which X-deo was further mixed shows that ammonia hydrogen sulfide formaldehyde had a great effect. However, it can be seen that the compressive strength is relatively low.

Example 19 in which gelite is further mixed shows that the adsorption deodorizing power and the compressive strength are lowered overall. However, since the gelite has a heavy metal neutralization, electromagnetic wave blocking, and cement toxic neutralization, it is more preferable to mix the zeolite with the zeolite rather than to mix it alone so that the compressive strength is not lowered.

In addition, referring to Example 20 and Example 25 mixed with two kinds of adsorption deodorant,

It can be seen that the compressive strength is improved in Example 20 in which diatomaceous earth and X-deo are mixed.

In addition, it can be seen that in Example 20 and Example 23 in which X-deo and diatomaceous earth or zeolite were mixed, the harmful gas removal rate and the compressive strength were excellent. However, in Example 25 in which X-deo and gellite were mixed, the harmful gas removal rate was good, but the compressive strength was relatively low.

Referring to Example 26 and Example 29, in which three kinds of adsorption odorants were selected and mixed,

Except for Example 28, in which the zeolite was not mixed, good compressive strength was shown, except that Example 27, which did not include X-deo, showed a good removal rate of harmful gas.

Therefore, each mixing ratio may be appropriately mixed so as to give the necessary functions according to the environmental conditions to be installed, and when all four types are mixed with the adsorption deodorant as in Example 6, the most effective removal efficiency for each harmful component It can provide high compressive strength.

Cement mortar according to the present invention can be mixed with desulfurized gypsum to suppress the occurrence of cracks as much as possible to block the inflow of radon components through the crack, and the various harmful substances discharged from the sulfated material discharged from the desulfurized gypsum and the finish installed on the surface The components may be adsorbed and deodorized, and the heavy metals included in the cement may be neutralized such as hexavalent chromium, lead, and arsenic to prevent heavy metal damage.

Claims (5)

Desulfurization gypsum 40 to 80% by weight, activated carbon 5 to 35% by weight, and adsorbent deodorant 2 to 35% by weight;
The adsorbent deodorant is composed of diatomaceous earth, zeolite, X-deo, gellite,
Shrinkage reducing agent comprising 10 to 30% by weight of diatomaceous earth, 25 to 45% by weight of zeolite, 25 to 45% by weight of X-deo, and 10 to 25% by weight of gellite with respect to 100% by weight of adsorption deodorant. delete delete Plastering cement comprising 20 to 60 parts by weight of the shrinkage reducing agent of claim 1 to 100 parts by weight of ordinary portland cement in which blast furnace slag fine powder is mixed at 0.1 to 2% by weight. For plastering comprising 20 to 60 parts by weight of shrinkage reducing agent of claim 1, 200 to 300 parts by weight of sand, and 40 to 50 parts by weight of water, based on 100 parts by weight of ordinary portland cement, in which blast furnace slag fine powder is mixed at 0.1 to 2% by weight. Mortar.