KR20080047328A - Composition for high retarding of the concrete solidification and the treating method of the waste concrete using thereof - Google Patents

Abstract

A concrete rapid hardening retardant composition is provided to be used in a small amount, to maintain a hardening retarding time for a long time, and to develop a color tone upon hardening. A concrete rapid hardening retardant composition includes (a) 1-60wt% of saccharide, (b) 1-10wt% of a gluconate, (c) 1-10wt% of a colorant, (d) 0.1-5wt% of a surfactant comprising at least any one selected from naphthalene-formaldehyde condensates, melamine-formaldehyde condensates, and polycarboxylic acid polymers, and (e) 15-68wt% of water. The saccharide is any one selected from monosaccharides, disaccharides, and polysaccharides, or mixtures thereof. Further, the concrete rapid hardening retardant composition additionally includes one of ZrO2, CaO, Fe2O3, MgO and CuO.

Description

COMPOSITION FOR HIGH RETARDING OF THE CONCRETE SOLIDIFICATION AND THE TREATING METHOD OF THE WASTE CONCRETE USING THEREOF}

The present invention relates to a concrete superhard retardant composition and a method of treating waste concrete using the same, in detail, adding the superhard retardant composition to a raw concrete mixture to delay concrete hardening and also generate color upon hardening. It relates to a super hardening retardant composition that can be.

In addition, the present invention relates to a method for treating waste concrete that expresses a color that can be easily confirmed with the naked eye when the superhardening retardant composition is added to the raw concrete mixture and cured before the raw concrete is used for a desired purpose.

In general, the concrete curing retardant is a kind of cement additive which is used to delay the hydration reaction of cement, thereby delaying the setting or curing of mortar or concrete.

Hardening of concrete usually occurs within 8 to 12 hours, but when it contains a retardant, it usually causes a curing delay of about 2 hours. It is classified as a delay type among the chemical admixtures for concrete as KSF 2560. have. However, the above-mentioned concrete chemical admixture delay type should have a large increase in usage because of its low delay characteristics.

The amount of delayed chemical admixture is generally used 0.5 to 1% of the weight of the cement, but in order to prevent the hardening required in the raw concrete should be used about 3% or more, but it is difficult to use a large amount in actual use.

Conventional cement hardening retardants are classified into two types, inorganic cement hardening retardants and ground meat cement hardening retardants. As the inorganic curing retardant, gypsum, lead oxide, boron oxide, borax, zinc chloride, zinc oxide, silicon fluoride, etc. are used, and the organic curing retardants include carbohydrates such as fructose, gluconic acid, hexafluorophosphate, lignin sulfonic acid and tartaric acid. , Pyruvic acid, glutaric acid and other keto acids are used. These cement hardening retardants are mainly used to transport fresh concrete for long periods in summer, and to relieve the stress caused by temperature changes in large concrete structures.

However, the cement hardening retarder inhibits hardening of the cement, but its effect is lost in a relatively short time.

Among them, sugar is the most inexpensive and excellent in performance, but it has the disadvantage of being decomposed by fermentation when stored for a long time in the liquid phase, and their amount is about 1 of the total weight of concrete based on 50 wt% solution It has the disadvantage of using more than%.

In the case of sugar, 50% by weight of the solution may be difficult to use due to the increase in viscosity at low temperatures, gluconate, etc. is difficult to make a 40% by weight aqueous solution is high usage.

 In Korean Patent Laid-Open Publication No. 2003-0004461, "Method for Adjusting Hydration Heat of Concrete and Mass Concrete Using This Delay Retardant" is a method of suppressing the heat of hydration in delayed mass concrete by mixing a ratio of powder sugar and water in a 1: 1 ratio. It has been suggested, but when using a large capacity such as ready-mixed concrete, there is an inconvenience to use a large amount at a time.

Therefore, there is an urgent need for a curing retarder, which can not only prolong the curing time considerably but also use a small amount.

The present inventors have made intensive efforts to solve the above-mentioned problems. As a result, the present inventors have completed the present invention by discovering that a small amount of use can significantly increase the hardening time of cement by properly mixing sugars, gluconates, surfactants, and pigments. It was.

Accordingly, an object of the present invention is to provide a concrete ultra high performance curing retardant composition that can be used for a long time and maintain a curing delay time for a long time.

Another object of the present invention relates to a superhard retardant composition capable of delaying concrete hardening by adding the above superhard retardant composition to a raw concrete mixture and also generating color upon hardening.

Another object of the present invention is to add a super-hardening retardant composition to the raw concrete mixture, and when it is cured before using the raw concrete for the desired purpose, a waste concrete treatment method for expressing a color that can be easily identified with the naked eye will be.

The object of the present invention as described above comprises at least one of (a) sugar, (b) gluconate, (c) colorant (d) naphthalene formaldehyde condensate, melamine formaldehyde condensate and polycarboxylic acid polymer A concrete superhard retardant composition comprising surfactant and (e) water, wherein the sugar is any one or a mixture thereof selected from the group consisting of monosaccharides, disaccharides, and polysaccharides. Is achieved.

Preferably, it comprises 1 to 60% by weight, 1 to 10% by weight of gluconate, 1 to 10% by weight of colorant, 0.1 to 5% by weight of surfactant and 15 to 68% by weight of water.

Another object of the present invention is to delay the hardening of the raw concrete mixture by at least 12 hours by adding and mixing the superhard retarder composition according to claim 1 or 2 to the raw concrete mixture comprising cement. When the hardening is achieved by the concrete super hardening delay method characterized by expressing the color.

Preferably, the amount of the superhard retardant composition is achieved by the concrete superhard retardation method, characterized in that 1% by weight or less (0 is not included) based on the weight of the cement.

As described in detail above, the present invention provides a method for easily treating waste concrete by preventing the hard concrete from curing when added to concrete, and more particularly include a strong retardant in concrete. In this case, concrete is not hardened, but when waste concrete occurs in ready-mixed concrete truck, etc., when the retardant of the present invention is added thereto, the concrete is not hardened and there is a significant economic advantage because it is not subjected to a shredding process when disposed of. . In addition, it is possible to prevent the use of concrete that has changed over time, which can degrade performance, so it is easy for quality control, and waste can be easily disposed, which is excellent in environmental aspects. In addition, it can be easily crushed even after long-term storage of waste concrete, which can be used as a selection layer or auxiliary base layer in the soil material.

The present invention relates to an easy-to-identify concrete superhard retardant composition that is easy to dispose of, consisting of (a) sugars, (b) gluconate, (c) pigments, (d) surfactants, and (e) water.

 Preferably, the present invention is characterized in that it comprises 1 to 60% by weight, 0 to 10% by weight of gluconate, 1 to 10% by weight of pigment, 0 to 5% by weight of surfactant and 15 to 98% by weight of water. It relates to a concrete superhard retardant composition.

In addition, the present invention relates to a method for treating waste concrete that expresses a color that can be easily confirmed with the naked eye when the superhardening retardant composition is added to the raw concrete mixture and cured before the raw concrete is used for a desired purpose.

As used herein, the term "super hardening retardant" refers to a suitable concrete that does not harden the concrete for at least 12 hours when mixed with concrete, so that it can be easily crushed or washed when waste concrete occurs to easily separate the waste concrete into gravel and sand. By a composition having the property of persisting the state.

In the above, the sugar may be any one selected from monosaccharides, disaccharides, and polysaccharides or mixtures thereof. Among them, mono- or disaccharides are preferred for use in the present invention because they are soluble in water.

Monosaccharides include glucose, fructose and galactose, and disaccharides include sucrose, maltose and lactose.

Gluconic acid in the composition may be any one selected from D, L and racemates or mixtures thereof. Preferably, D-gluconic acid is most used.

Preferably the present invention is to provide a composition of ultra-high performance retardant for concrete, characterized in that it can delay the curing time of the concrete by at least 12 hours at least 15Kg based on the ready-mixed concrete truck.

Therefore, in the product of the present invention using less than 1.0% of the weight of the cement can cause a curing delay of at least 12 hours, and there is a change in color to confirm that the waste concrete can prevent its reuse.

In addition, typically, since the case is to use a solution of sugar and 50% by weight In order to light curing delay amount of concrete is usually used for more than 18Kg is used in the field it is difficult to 6m based on the capacitance ³ of ready-mixed concrete truck. For practical applications, less than 15kg is usually suitable because it can be easily moved to the top of ready-mixed concrete trucks.

In a preferred embodiment of the present invention, the content of each component included in the composition of the ultra-high performance curing retardant of the present invention is preferably 1 to 60% by weight, 1 to 10% by weight of gluconate, and 1 to 1% by weight of the active ingredient. 10% by weight, 0.1-5% by weight of surfactant and 15-98% by weight of water as solvent.

Preferably it is 1-50 weight% sugar, 1-10 weight% gluconate, 1-5% coloring agent, 0.1-0.5 weight% surfactant, and 25-68 weight% water. When at least one or more retardants, colorants, and surfactants are used in the composition of the retardant, the curing time may be adjusted according to the concentration and amount used.

In addition, as a series of retardants, hydrocarboxylic acid salts such as citrate, tartarate, tannin, saccharate, dried salt, salicylate salt and heptonic acid salt, mannose, glucose and xyl It is obvious that it is included in the present invention, although it is not particularly known that it is used in the treatment method of waste concrete containing saccharides such as lox (xylos), galactose (galactose).

As the pigment, colorants such as cyanine green, malachite green, chromium oxide, and iron oxide, which can be used in concrete, can be used.

 As the surfactants, dispersants that can disperse the pigments, such as naphthalene formaldehyde condensates, melamine formaldehyde condensates, polycarboxylic acid polymers that do not cause problems in water pollution can be used.

When the content of the active ingredient in the composition is less than 30% by weight, even if the amount of 15kgg per used concrete trucks do not occur as much as necessary to cure delay, and less than 15% by weight of water is too difficult to use the viscosity.

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention in more detail, and the scope of the present invention is not limited by these examples in accordance with the gist of the present invention to those skilled in the art. Will be self-evident.

Example  1: concrete super high performance hardening Retardant  Preparation of Composition (Ⅰ)

To prepare a concrete ultra-high performance curing retarder composition of the present invention in the composition shown in Table 1.

ingredient Content (% by weight) Preparation Example 1 Preparation Example 2 Preparation Example 3 Preparation Example 4 Party 25 50 50 50 Gluconate 10 0 5 10 Pigment 1.5 1.5 1.5 1.5 Surfactants 0 0.5 0.5 0.5 Sum 100 100 100 100

Among the components shown in Table 1, sugar was used as the white sugar of Samyang, and in the case of sodium gluconate, a product of the domestic KG Chemical was used. In addition, gluconate was used as the domestic KG Chemical's soda gluconate, and the surfactant was LG Chem's polycarboxylic acid polymer.

The components were all added simultaneously and then dissolved for 20 minutes in a general mixer at 60 rpm at 50 ° C.

Example  2: super hard concrete Retardant  Confirmation of Concrete Delay Performance by Addition

Experiment to confirm the performance (curing time delay) of the concrete ultra-high performance curing retardant composition of the present invention prepared in Example 1 was performed. Here, the control group compared the delay performance of the curing time according to the amount of use of the existing concrete (Comparative Example 1), the super high-performance curing retardant is added to the super high-performance curing retardant of the present invention (Example 2) ).

Experimental Example  1: Measurement of delay performance by usage

The delay performance was measured by measuring the curing time of the chemical admixture for KSF 2560 concrete.

division Ultra High Performance Curing Retardant Usage (Kg / 6m ³ ) Exterior Setting time (Hr) First closing Comparative Example 1 15 grey 7:15 9:15 Example 1 15 blue 11:30 14:30 Example 2 15 blue 22:30 24:30 Example 3 15 blue 33:45 25:30 Example 4 15 blue 38:30 54:30

As shown in Table 2, compared to Comparative Example 1, all of the appearance was clearly distinguished from the blue in comparison with the ultra-high retardant is not used, and in the case of Example 1 hardening delay began to occur largely, Example 2, In the case of 3 and 4, the curing time significantly exceeded the required time of 12 hours and showed satisfactory performance. However, since the reaction time of the cement varies according to the season, as the setting time is very fast in the field in summer, it is preferable to increase the setting time more than 12 hours by the standard method as in Examples 2, 3 and 4. .

Claims (4)

a surfactant comprising at least one of (a) sugars, (b) gluconate, (c) colorants (d) naphthalene formaldehyde condensates, melamine formaldehyde condensates, and polycarboxylic acid polymers, and (e) water In the concrete superhard retardant composition, The sugar is a concrete superhard retarder composition, characterized in that any one or a mixture thereof selected from the group consisting of monosaccharides, disaccharides, and polysaccharides. According to claim 1, characterized in that it comprises 1 to 60% by weight of sugar, 1 to 10% by weight of gluconate, 1 to 10% by weight of colorant, 0.1 to 5% by weight of surfactant and 15 to 68% by weight of water. Concrete superhard retardant composition. By adding and mixing the superhard retarder composition according to claim 1 or 2 to the raw concrete mixture comprising cement, delaying the curing of the raw concrete mixture for at least 12 hours, and expressing color upon curing. Concrete super hardening delay method characterized by. 4. The method of claim 3, wherein the amount of the superhard retardant composition is 1 wt% or less (0 is not included) based on the weight of the cement.