KR20120113015A - Composition of saving cement and curing method of high strength thereby - Google Patents

Abstract

PURPOSE: A cement reducing agent and high strength curing method using the same are provided to minimize use amount of cement and prevent strength degradation. CONSTITUTION: A cement reducing agent comprises 10-15 parts by weight of KCL, 5-10 parts by weight of sodium chloride, 5-10 parts by weight of ammonium chloride, 1-5 parts by weight of nickel chloride, 1-5 parts by weight of cobalt chloride, 20-30 parts by weight of sodium carbonate, and 5-15 parts by weight of potassium carbonate. A high strength curing method of construction comprises the following steps: manufacturing cement reducing agent(s10); manufacturing a mixture by mixing 100 parts by weight of aggregate and 1-10 parts by weight of the cement reducing agent(s20); dry-mixing after putting 16-25 parts by weight of water into the mixture(s30); and installing and curing the mixture(s40). [Reference numerals] (S10) Manufacturing cement reducing agent; (S20) Manufacturing a mixture (aggregate, cement, cement reducing agent); (S30) Mixing and agitating after adding water; (S40) Installing and during the mixture

Description

Technical Field [0001] The present invention relates to a high strength curing method using a cement reducing agent and a cement reducing agent,

The present invention relates to a high strength curing method using a cement reducing agent and a cement reducing agent. More specifically, the present invention can significantly reduce the amount of cement used and maintain the strength higher than the conventional strength, And a cement reducing agent and a cement reducing agent which can reduce the amount of cement by 30 to 50% compared with the conventional method.

Recently, the construction industry is demanding an efficient construction method for construction materials by applying new technology and new construction method, and it is also required to satisfy two requirements of lowering the production cost by excessive competition in the construction industry.

This tendency is no exception, especially for cement, which accounts for the largest proportion of construction materials. Currently, Portland cement and various special cements are used as binders for domestic and overseas concrete.

The content of cement in general cement block or concrete structure is 15-25 parts by weight based on 100 parts by weight of aggregate, resulting in a higher unit price of the product.

In addition, if the content of cement is reduced in order to lower the product cost, there is a problem that the compressive strength and the compressive strength are significantly reduced.

On the other hand, recently, as interest in health has increased, there has been a problem of toxicity of cement harmful to the human body in a wellbeing boom.

These problems affect the surrounding environment and ecosystem, and the problem of overuse of cement has been raised as environment-friendly problems have arisen to the river block of the river and the sidewalk block of the river.

It is an object of the present invention to provide a high strength curing method using a cement reducing agent and a cement reducing agent capable of minimizing the amount of cement used and maintaining the cement curing product at a level higher than the conventional strength.

It is another object of the present invention to provide an economical cement reducing agent and a cement reducing agent that can reduce construction cost by reducing the amount of cement used in concrete blocks and concrete products.

It is another object of the present invention to provide a high strength curing method using a cement reducing agent and a cement reducing agent capable of curing concrete and the like in a more environmentally friendly manner than before.

It is another object of the present invention to provide a cement reducing agent and a cement reducing agent capable of promoting dry curing at room temperature, which greatly improves productivity and workability, is quick in curing reaction, To thereby provide a high-strength curing method using the same.

In order to achieve the above object, the cement reducing agent according to the present invention comprises 10-15 parts by weight of potassium chloride, 10-15 parts by weight of sodium chloride, 5-10 parts by weight of ammonium chloride, 1-5 parts by weight of nickel chloride, 1-5 parts by weight of cobalt chloride 20 to 30 parts by weight of sodium carbonate, 20 to 30 parts by weight of potassium carbonate and 5 to 15 parts by weight of boric acid.

Also, the high strength curing method using the cement reducing agent according to the present invention is characterized in that 10-15 parts by weight of potassium chloride, 10-15 parts by weight of sodium chloride, 5-10 parts by weight of ammonium chloride, 1-5 parts by weight of nickel chloride, 20 to 30 parts by weight of sodium carbonate, 20 to 30 parts by weight of potassium carbonate and 5 to 15 parts by weight of boric acid to prepare a cement reducing agent; 100 parts by weight of aggregate, 1 to 10 parts by weight of cement and 0.025 to 0.4 part by weight of the cement preservative to prepare a mixture; 16 to 25 parts by weight of water is added to the mixture and mixed and agitated; And pouring and curing the dry-beaten mixture.

Also, in the high strength curing method using the cement preservative according to the present invention, the cement reducing agent is mixed with 0.3 to 6.0 parts by weight based on 100 parts by weight of the cement.

Also, in the high-strength curing method using the cement preservative according to the present invention, the casting and pouring step is performed by placing the mixture on a mold and compression-molding it, and then compressing the mixture at room temperature (15 to 30 ° C) And curing for 10 hours.

According to the high strength curing method using the cement saving agent and the cement saving agent according to the present invention having the above-described structure, the amount of the cement used is remarkably reduced and the strength is maintained to be higher than the existing strength.

According to the high strength curing method using the cement saving agent and the cement saving agent according to the present invention, it is possible to reduce the manufacturing cost by 30 ~ 50% according to the reduction of the cement usage amount, and it is possible to use the raw materials which can supply and receive in Korea .

According to the high strength curing method using the cement saving agent and the cement saving agent according to the present invention, it is possible to cure concrete and the like more eco-friendly than before, and thus it has an effect of protecting mankind and ecosystem.

According to the high strength curing method using the cement reducing agent and the cement reducing agent according to the present invention, the strength of the curing curing is increased by about 50 to 100% than that of the conventional wet curing, and the productivity and workability are superior to the wet curing, This has a quick effect.

According to the high strength curing method using the cement reducing agent and the cement reducing agent according to the present invention, sufficient physical properties can be obtained irrespective of kinds of aggregates such as rosin, soft soil, sandy soil, and marathon.

1 is a process diagram showing an embodiment of a high strength curing method using a cement preservative according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described more specifically with reference to the accompanying drawings.

1 is a process diagram showing one embodiment of a high strength curing method using the cement preservative according to the present invention. As shown in FIG. 1, the high strength curing method using the cement reducing agent of the present invention comprises 10-15 parts by weight of potassium chloride, 10 parts by weight of sodium chloride 5 to 10 parts by weight of ammonium chloride, 1 to 5 parts by weight of nickel chloride, 1 to 5 parts by weight of cobalt chloride, 20 to 30 parts by weight of sodium carbonate, 20 to 30 parts by weight of potassium carbonate and 5 to 15 parts by weight of boric acid (S10) mixing the cement paste with the cement paste; (S20) mixing 100 parts by weight of the aggregate, 1 to 10 parts by weight of the cement and 0.025 to 0.4 part by weight of the cement preservative to prepare a mixture; A dry beam step (S30) in which 16 to 25 parts by weight of water is mixed and stirred; And a step (S40) of placing and curing the dried mixture.

Meanwhile, the cement reducing agent according to the present invention includes potassium chloride, sodium chloride, ammonium chloride, nickel chloride, cobalt chloride, sodium carbonate, potassium carbonate and boric acid.

The cement reducing agent may be classified into a functional material that contributes to the coagulation reaction between the aggregates of the aggregates and a set material that promotes the curing of the cement.

The functional materials according to the invention are potassium chloride, sodium chloride and boric acid, and the setting materials are ammonium chloride, nickel chloride, cobalt chloride, sodium carbonate and potassium carbonate.

The function of potassium chloride, sodium chloride, and boric acid is catalyzed by the water content of cement and aggregate soil particles to form etalinite, which is a stable mineral of many hydrates.

Et Lin ZUID (Ettringite) a calcium sulfo aluminate hydrate (Calcium Sulfoaluminate Hydrate) as a formula _{Ca 6 Al 2 (SO 4)} 3 (OH) 12 and 26H ₂ O, density 1.77, colorless hexagonal hardness 2 ~ 2.6 Minerals , It controls the curing reaction time of concrete and increases the strength, but also acts to prevent the contraction action.

The step (S10) of producing the cement reducing agent according to the present invention can roughly be divided into a raw material crushing and a mixing ratio adjusting step.

The raw material pulverization is preferably carried out by pulverizing each raw material with a ball mill and passing through a 100 mesh standard.

This is to ensure uniform mixing of each raw material with aggregate, cement, and the like. Since the raw materials are highly hygroscopic and accompanied by changes in properties, it is preferable to store them in a dry place at room temperature by moisture-proof packaging, and to prevent access of moisture as much as possible.

The cement reducing agent according to the present invention comprises 10-15 parts by weight of potassium chloride, 10-15 parts by weight of sodium chloride, 5-10 parts by weight of ammonium chloride, 1-5 parts by weight of nickel chloride, 1-5 parts by weight of cobalt chloride, 20 to 30 parts by weight of potassium carbonate and 5 to 15 parts by weight of boric acid is preferable because it can efficiently perform the condensation and curing between the components.

The part by weight according to the present invention means the absolute value of the weight of each component. For example, in the case of the cement preservative according to the present invention, 10 to 15 g of potassium chloride, 10 to 15 g of sodium chloride, 5 to 10 g of ammonium chloride, 1 to 5 g of nickel chloride, 1 to 5 g of cobalt chloride, 20 to 30 g of sodium carbonate, 30 g of boric acid, and 5 to 15 g of boric acid.

The step S20 of producing the mixture according to the present invention comprises mixing 100 parts by weight of aggregate, 1 to 10 parts by weight of cement and 0.025 to 0.4 part by weight of the cement preservative to prepare a mixture.

In the present invention, the mixing ratio between the two components of cement and cement is preferably 0.3 to 6.0 parts by weight based on 100 parts by weight of the cement.

In the present invention, the ratio of the cement to the cement reducing agent may be less than 0.3 part by weight based on 100 parts by weight of the cement. If the amount of the cement reducing agent is less than 0.3 part by weight, There is a problem that the increase rate of the effect of the curing and curing action is small compared to the amount of the cement reducing agent.

In the step (S30) of dry-blending the mixture according to the present invention, 16 to 25 parts by weight of water is added to the aggregate, the cement and the cement reducing agent, followed by mixing and stirring.

Also, the dry beam beam according to the present invention means that the aggregate contains 16-25 parts by weight of water including the water content of the aggregate.

That is, the amount of water should be determined in consideration of the moisture content of the aggregate. In the above, 1 to 10 parts by weight of water relative to 100 parts by weight of the aggregate is based on 15% moisture content of the aggregate. It is preferable that the total amount of water is adjusted to be 16 to 25 parts by weight.

At this time, the water content becomes the optimum water content for rapid cement hardening by the hydration reaction. When the water content of the aggregate to be solidified is 15% or less, the adjustment water (adjustment water) is further added to the aggregate to be cured so that the total amount of water containing the aggregate and the water to be added is 16 to 25 parts by weight, Go ahead. If the water content of the aggregate to be cured is 15% or more, the amount of water to be added and the amount of water to be added are adjusted to 16 to 25 parts by weight so that the dry aggregate is mixed.

If the total amount of the water contained in the aggregate and the water to be added is less than 16 parts by weight, the hydration reaction may be too slow or the reaction may stop in the middle and the high quality product can not be produced.

If the total of the water content of the aggregate and the water to be added exceeds 25 parts by weight, the non-beam mixture becomes too thin, the water flows and the cement and the reducing agent are lost, and a homogeneous mixture can not be formed. Can not.

The placing and curing step (S40) is carried out by pouring the mixture into a mold and compression-molding, then curing the mixture at room temperature (15 to 30 DEG C) at a humidity of 60% or less for 6 to 10 hours, And workability can be improved. And the humidity may be 20 to 60%.

Hereinafter, the cement preservative according to the present invention and the high strength curing method using the same will be described in more detail with reference to Examples and Comparative Examples.

[ Example  1 to 11]

1. Manufacture of cement saving agent

Prepare the raw material of cement saving agent with the following composition.

1) Grinding of raw materials: Each material having the following composition ratio is pulverized by a ball mill and the powder passed through a 100 mesh standard is used as a raw material.

2) Mixing ratio: 11 parts by weight of potassium chloride, 12 parts by weight of sodium chloride, 10 parts by weight of ammonium chloride, 8 parts by weight of nickel chloride, 4 parts by weight of cobalt chloride, 20 parts by weight of sodium carbonate, 20 parts by weight of potassium carbonate and 15 parts by weight of boric acid, Produce saving agent.

2. Manufacture of standard aggregate

The standard aggregate is prepared by mixing ordinary sand and stone with a ratio of 4: 6, and the moisture content of the mixed standard aggregate is adjusted to 15%.

3. Specimen preparation and curing

KSF 2403 Preparation method of concrete specimen for concrete strength test Prepare according to the criteria as shown in Table 1 on the basis of 2L (volume) by the following procedure.

[ Comparative Example  One]

Comparative Example 1 was prepared in the same manner as in Example 1 except that no reducing agent was added.

※ 1 axis compression strength test and test method

The weight ratio of each compounding material is to be calculated according to the design ratio of each of the 12 samples, and the test is conducted in accordance with KS F 2403 (Specimen for Specimen for Concrete Strength Test) and KS F 2405 (Concrete Compressive Strength Test Method).

1) Specimen mold assembly (12 pieces)

2) Sample weighing

3) Mixing Mixer

4) filling and compaction of the specimen

5) Dead body capping

6) KS non-regulation items: wet curing (curing: 8 hours 60 ℃) or normal temperature curing

7) Mold demolding (after 16 hours)

8) Water tank curing (20 ℃ ± 2 ℃ for 7 days)

Preparation ratio of cement and curing method compare
Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 practice
Example 6 practice
Example 7 practice
Example 8 Example 9 practice
Example 10 Example 11 aggregate 100 100 100 100 100 100 100 100 100 100 100 100
Portland cement 7.5 7.5 7.5 7.5 3.0 5.0 10.0 10.0 7.5 7.5 3.0 3.0
Cement saving agent 0 0.1 0.2 0.3 0.1 0.1 0.1 0.1 0.1 0.1 0.2 0.2
water One One One One One One One One 4 8 4 4
Curing method Wet Wet Wet Wet Wet Wet Wet Reason Wet Wet Wet Reason

Aggregate, Portland cement, cement-reducing agent and water are mixed based on the weight parts of the present invention, respectively.

4. Test results

(1) Appearance and color

After curing for 8 hours after mold insertion, the color of the sample is light gray due to cement hydration reaction.

(2) Moldability and initial strength

The moldability and the initial strength are also excellent.

(3) Compressive strength test

[Estimation of strength at 28 days by strength of concrete at 7 days]

It is estimated that the strength of concrete used for estimating the strength of design basis (28 days) is the strength of 7 days, which is 65% of the strength of 28 days, though there are slight differences depending on the temperature. However, the strength of 7 days is to simply estimate the strength of the 28th day, but the strength of the 7th day alone can not pass the design standard strength and fail.

The formula for estimating the strength for 28 days at room temperature using 7 days strength is as follows.

F-28 days Estimation formula: F28 = 1.35 × F7 + 30

(F28 = strength of 28 days, F7 = strength of 7 days, unit = Kgf / cm2)

※ Example of calculation of uniaxial compressive strength according to 7 days' strength

Breaking load = 13,000 kgf (10kgf for instrument panel)

According to the compressive strength equation "P (kgf) / A (cm 2) = kgf / cm 2", the specimen area (A) = 78.5 cm 2

13,000 kgf (7 days compressive strength) / 78.5 cm 2 = 165.6 kgf / cm 2 = 1623.98 N / cm 2 = 16.24 N / mm 2

F28 = 1.35 x F7 + 30

(F28 = strength of 28 days, F7 = strength of 7 days, unit = Kgf / cm2)

Therefore, when the strength of 28 days is estimated by the above formula, 1.35 x 165.6 kgf / cm 2 + 30 = 253.56 kgf / cm 2 = 24.87 N / mm 2.

The uniaxial compressive strength of each specimen according to the above test and formula is as shown in Table 2 below.

Results of uniaxial compressive strength of specimen Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 (a) 11,000 19,000 23,800 24,800 7,500 13,000 28,500 59,400 23,600 24,200 19,400 28,800 (b) 78.5 78.5 78.5 78.5 78.5 78.5 78.5 78.5 78.5 78.5 78.5 78.5 (c) 140.13 242.04 303.18 315.92 95.88 165.61 363.60 756.69 300.64 308.28 247.13 366.88 (d) 13.74 23.74 29.73 30.98 9.78 16.24 35.66 74.21 29.48 30.23 24.24 35.98 (e) 21.49 34.99 43.08 44.77 12.64 24.87 49.55 103.12 42.74 43.76 35.66 51.51

In Table 2, (a), (b) and (d) are the compressive fracture strength (kgf), the effective sectional area (cm 2), the unit compressive strength (kgf / , and (e) represents the strength for 28 days (N / mm 2).

(4) Change in strength according to content of cement reducing agent

As shown in Table 3, as the amount of cement preservative increases, the compressive strength increases as the addition amount increases. However, when the amount exceeds 0.2 parts by weight, the rate of increase is low and the economical efficiency decreases. Therefore, the most economical and efficient cement preservative is 0.2 part by weight.

Change in strength according to the content of reducing agent Comparative Example 1 Example 1 Example 2 Example 3 Aggregate (parts by weight) 100 100 100 100 Portland cement
(Parts by weight) 7.5 7.5 7.5 7.5 Saving agent (parts by weight) 0 0.1 0.2 0.3 Water (parts by weight) One One One One Saving agent (parts by weight) 11,000 19,000 23,800 24,800 Effective area (㎠) 78.5 78.5 78.5 78.5 Unit compressive strength
(kgf / cm2) 140.13 242.14 303.18 315.92 7 days strength (N / mm2) 13.74 23.74 29.73 30.98 28 days strength (N / mm2) 21.49 34.99 43.08 44.77 Curing method Wet Wet Wet Wet Strength increase rate (%) 100.0 162.8 200.5 208.3

(5) Change in strength according to cement content

As shown in Table 4, the compressive strength increases with the increase of the cement content. However, in the case of Comparative Example 1 in which the cement preservative is not added, it is only 60% of that of Example 1 including 0.1 part by weight of the cement reducing agent. Therefore, the required compressive strength of the general block according to Korean Industrial Standard KS F 4004 is not more than 8 N / mm 2, the required compressive strength of the load block is more than 16 N / mm 2, and the required compressive strength of the concrete is not more than 24 N / When the content of cement is at least 15% or more, sufficient strength can be provided. Therefore, if the content of cement is reduced to about 1/2 of that of the conventional amount, and the addition of 0.2 part by weight of the reducing agent, the compressive strength exceeding the compressive strength by the amount of the existing cement can be realized.

Change in strength according to cement content Example 4 Example 5 Example 1 Example 6 Aggregate (parts by weight) 100 100 100 100 Portland cement (parts by weight) 3.0 5.0 7.5 10.0 Saving agent (parts by weight) 0.1 0.1 0.1 0.1 Water (parts by weight) One One One One Pressure breaking strength
(kgf) 7,500 13,000 19,000 28,500 Effective area (㎠) 78.5 78.5 78.5 78.5 Unit compressive strength
(kgf / cm2) 95.88 165.61 242.04 363.60 7 days strength (N / mm2) 9.78 16.24 23.74 35.66 28 days strength (N / mm2) 12.64 24.87 34.99 49.55 No addition of cement preservatives
Strength (N / mm2) 7.6 15.0 21.0 30.0 Strength increase rate (%) 100.0 196.8 276.8 392.0

(6) Change in strength according to the content of water

As shown in Table 5, the amount of water used is the amount of water added based on the water content of the aggregate being 15%, and the amount of water added is most preferably 3 to 4 parts by weight in consideration of the non-beam state of the mixture.

Change in strength according to the content of water Example 1 Example 8 Example 9 Aggregate (parts by weight) 100 100 100 Portland cement (parts by weight) 7.5 7.5 7.5 Cement saving agent (parts by weight) 0.1 0.1 0.1 Water (parts by weight) One 4 8 Pressure Breaking Strength (kgf) 19,000 23,600 24,200 Effective area (㎠) 78.5 78.5 78.5 Unit compressive strength
(kgf / cm2) 242.04 300.64 308.28 7 days strength (N / mm2) 23.74 29.48 30.23 28 days strength (N / mm2) 34.99 42.74 43.76 Curing method Wet Wet Wet Strength increase rate (%) 100.0 122.1 125.0

(7) Change in strength according to curing method

As shown in Table 6, the curing method has a strength increase of about 50 to 100% in the curing period of the conventional wet curing, and the curing curing is superior to the wet curing in workability and productivity.

Change in strength according to curing method Example 6 Example 7 Example 10 Example 11 aggregate 100 100 100 100 Portland cement
(Parts by weight) 10.0 10.0 3.0 3.0 Cement saving agent
(Parts by weight) 0.1 0.1 0.2 0.2 Water (parts by weight) One One 4 4 Pressure Breaking Strength (kgf) 28,500 59,400 19,400 28,800 Effective area (㎠) 78.5 78.5 78.5 78.5 Unit compressive strength
(kgf / cm2) 363.60 756.69 247.13 366.88 7 days strength (N / mm2) 35.66 74.21 24.24 35.98 28 days strength (N / mm2) 49.55 103.12 35.66 51.51 Curing method Wet Reason Wet Reason Strength increase rate (%) 100.0 208.1 100.0 144.4

5. Conclusion

As a result of the various tests as described above, when the cement reducing agent and the curing method according to the present invention are applied, they exhibit excellent effects in terms of strength enhancement, environmental friendliness, cost reduction and cost reduction, productivity and workability Respectively.

(1) As shown in Example 11, the addition of 0.2 part by weight of the cement reducing agent increased the strength of 100%, the addition of 4 parts by weight of water (the aggregate water content was 15%), and the curing method, Production of eco-friendly block and concrete structure with sufficient strength by obtaining the maximum required compressive strength of 24 N / ㎟ or more even if the amount of cement used is reduced from 15-25 parts by weight to 3-5 parts by weight based on 100 parts by weight of aggregate This is possible.

(2) Cost reductions of about 30-50% can be expected, except for the cost of using cement at the cost of using cement.

(3) In the curing method, the strength of curing curing is about 50-100% higher than that of the existing curing curing, and the productivity and workability are superior to the wet curing.

(4) It is possible to provide a cement-reducing agent exhibiting excellent effects such as quick curing reaction and improvement in strength of a cured product.

(5) It is possible to provide a cement reducing agent which effectively exerts excellent effects irrespective of kinds of aggregates such as chromium, soft soil, sandy soil, and marble.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (4)

10 to 15 parts by weight of potassium chloride, 10 to 15 parts by weight of sodium chloride, 5 to 10 parts by weight of ammonium chloride, 1 to 5 parts by weight of nickel chloride, 1 to 5 parts by weight of cobalt chloride, 20 to 30 parts by weight of sodium carbonate, And 5 to 15 parts by weight of boric acid.
10 to 15 parts by weight of potassium chloride, 10 to 15 parts by weight of sodium chloride, 5 to 10 parts by weight of ammonium chloride, 1 to 5 parts by weight of nickel chloride, 1 to 5 parts by weight of cobalt chloride, 20 to 30 parts by weight of sodium carbonate, And 5 to 15 parts by weight of boric acid to prepare a cement preservative;
100 parts by weight of aggregate, 1 to 10 parts by weight of cement and 0.025 to 0.4 part by weight of the cement preservative to prepare a mixture;
16 to 25 parts by weight of water is added to the mixture, followed by mixing and agitation; And
Placing and curing the dry-bombed mixture;
The method of curing high strength using a cement reducing agent according to claim 1,
3. The method of claim 2,
Wherein the cement reducing agent is mixed in an amount of 0.3 to 6.0 parts by weight based on 100 parts by weight of the cement.
3. The method of claim 2,
Wherein the pouring and curing are performed by casting the mixture into a mold, compression molding, and curing at room temperature of 60% or less at room temperature for 6 to 10 hours.

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