JP6347019B1 - A method of manufacturing concrete with admixture to prevent deterioration. - Google Patents

Abstract

The present invention provides a method for producing a concrete containing a deterioration-preventing admixture that realizes prevention of high hardness, water resistance, weather resistance, alteration and discoloration, and is capable of preventing deterioration in the same manner as a new article. A small amount of solvent is used at the stage of using an aqueous liquid glass to be applied to the surface of an existing concrete structure or the like, or concentrating the liquid glass by evaporating water with a drier or the like, or dissolving quartz glass. The liquid glass is refined to a moderately concentrated liquid glass, and the non-concentrated or concentrated liquid glass is used as a concrete admixture, and the liquid glass is used as a concrete deterioration-preventing admixture. A concrete manufacturing method consisting of ready-mixed concrete blended and blended at a rate calculated by the amount per unit. [Selection] Figure 1

Description

In the present invention, the useful life of a concrete structure produced by a conventional ready-mixed concrete manufacturing method is generally around 50 years, and maintenance and repairs require a huge amount of cost to prevent deterioration with repair materials and repair agents according to the application. .
The cause of this deterioration is the fatigue of concrete and reinforced steel in reinforced concrete, and the shrinkage, frost damage, alkali-aggregate reaction, corrosion in an acidic environment, Neutralization, salt damage (rusting) and neutralization (rusting) are the main causes of deterioration in steel materials, and cracks, delamination and discoloration of concrete as material deterioration, and corrosion (rust) in steel materials In the deterioration of the structure, load resistance performance, aesthetics, etc. are considered as deterioration factors, so the liquid glass developed (invented) to eliminate these deterioration factors is purified into an admixture and used appropriately. It is hardened as quartz glass in the normal temperature range by mixing it with ready-mixed concrete at a proper ratio and kneading with a mixer, realizing high hardness, water resistance, weather resistance, discoloration, etc. Conch made possible The method for producing a degradation preventing admixture input Concrete characterized over bets.

Liquid glass is mainly composed of fine particles extracted from quartz / SiO2 crystals which are made of glass. Fused quartz glass is mainly natural crystal, also to melt at room temperature is a "mix material is a trade secret", however, has already been commercialized as liquid glass agent, Co., Ltd. Nikko (founder liquid glass Mr. Masatoshi Shioda, the inventor of the company) uses a method of applying a liquid glass agent to the surface of porous materials such as concrete and wood and infiltrating it. The osmotic film thickness of the high-density glass layer is as thin as 5-6 mm from the concrete surface. Stage of ready-mixed concrete production process, utilizing water resistance of water droplets / salt water / acid rain, permeation of water vapor gradually, and effective reforming method to suppress carbon gas intrusion causing neutralization By using the liquid glass purified in the above as an admixture, the concrete itself is hardened into quartz glass by mixing with the liquid glass, and becomes non-degraded (meaning prevention of deterioration) concrete.

In the production of ready-mixed concrete, it is usually used for the production of conventional blends in which sand and gravel (crushed stone) aggregate is mixed with water and the existing admixture according to the application in an appropriate ratio and mixed with a mixer. In addition, the existing liquid glass or the liquid glass that has been refined with a small amount of solvent at the stage of dissolving the quartz glass is used as an admixture and blended into the ready-mixed mixture at an appropriate ratio. cured quartz glass by a method of mixing kneading, the structure of unreinforced and Yusuji concrete, and the production of secondary products, quartz glass at ambient temperature region (specified as 15-25 ° C. the room temperature) As for liquid glass that hardens rapidly, quartz, which is a component of the stock solution, that is, silicon dioxide (Sio2), is characterized by the fact that glass is the main component and is resistant to weathering, and it has been produced as a concrete that has the effect of preventing deterioration. The problem can be solved by the manufacturing method of the concrete with the additive admixture.

  The present invention has been devised in view of such a situation, and is made of deterioration-preventing admixture-containing concrete characterized by concrete that does not require maintenance and repair by changing from deteriorating concrete to non-deteriorating concrete. Regarding the method.

In the production of ready-mixed concrete according to claim 1 (hereinafter also referred to as "ready-con"), an admixture containing an appropriate amount of admixture according to the application is mixed with water, sand and gravel aggregate in cement at a plant. in ready mixed concrete produced for kneading manufactured concentrate, the composition of the raw material liquid glass, and Sio2 inorganic fine particles, a TEOS + alcohol, a binder, Mg, V, by components of Zn, the formulation was reduced to alcohol formulation of raw material composition This product is refined into liquid glass and used as a concrete admixture. Concentrated liquid glass admixture is manufactured into a ready-mixed concrete mix at a ratio per unit volume calculated under concrete design conditions. The present invention relates to a method for producing a concrete containing a deterioration-preventing admixture characterized by the production of concrete placed in a formwork.

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  The method for producing a concrete with an admixture for preventing deterioration according to the present invention has a high hardness by curing as a quartz glass in a normal temperature region in a concrete structure and precast concrete (secondary product) or cast-in-place concrete or mortar. In the production of concrete and mortar characterized by ready-mixed concrete and mortar that prevents deterioration by a modifier that prevents water resistance, weather resistance, alteration and discoloration, etc., the production method of concrete with deterioration-preventive admixture is also expensive at 1 cubic meter However, it can be used for public civil engineering and high-rise buildings and condominiums, etc., making repair work unnecessary, and its economic effect is greater.

Next, with reference to drawings, the manufacturing method of the concrete with a deterioration preventing admixture of the present invention will be described.

In the present invention, in the production of ready-mixed concrete, the aggregate of water and sand and gravel cement plant, hitherto mixed concrete manufacture of the manufacture kneading the formulation by a mixer with a suitable amount percentage of existing admixtures according to the application On the way,
Since existing liquid glass is a thin liquid glass for the purpose of coating on the surface of wood and concrete structures, it is necessary to use it at a high concentration, so Sio2 inorganic fine particles that compose the raw material of liquid glass, and TEOS It is refined into concentrated liquid glass by blending raw materials to be composed with a small amount of system components + alcohol, a small amount of binder, Mg, V, and Zn, and used as a concrete admixture. In order to use liquid glass as an admixture, quartz glass (referred to as fused silica glass) as a raw material is a kind of glass as the name suggests, while other glasses are made of various components, while quartz glass is Because it is almost made of only Si02, the amount of metal impurities contained in quartz glass is extremely small, with many being several tens of PPM (parts per 100,000), and few being less than 10 PPb (parts per hundred million). The high feature is quartz glass, and it is composed of silicon dioxide (Si02) and other material elements from trace amounts of boric acid (B203), alumina, lead oxide, sodium oxide, potassium oxide, and calcium oxide. However, silicon dioxide (Si02) as a main raw material is composed mainly of silicon dioxide having a high purity of 99,9% or more.
As far as Nikko Corporation claims, this liquid glass manufacturing method uses quartz glass, but it is said that liquid glass is made only with the component indication of “water + ethanol + fine glass”, but in fact it is “the wonder of liquid glass”. The composition of the liquid glass was revealed by the patent literature in
That is, (1) Si02 inorganic fine particles called quartz, (2) TEOS (tetraethoxysilane) component + alcohol, (3) a small amount of binder, (4) Mg (magnesium), V (vanadium), It is found that the composition (substance of the substance) is due to a small amount of components such as Zn (zinc), but the ratio of elements is not described in the patent literature. With this composition, Nikko Co., Ltd. has "refined liquid glass" . This liquid glass is used as a concrete admixture, and is mixed and blended at a ratio calculated per unit volume under concrete design conditions. Manufacturing method of concrete with admixture for preventing deterioration, characterized by the production of concrete that has the effect of preventing deterioration from the fact that silicon dioxide (Sio2), which is a component of quartz, is mainly composed of glass and is resistant to weathering. It is.

Originally, the invention of liquid glass was in 1987, and 30 years have already passed since product development, and Mr. Masatoshi Shioda, the manager of Nikko Co., Ltd., the inventor at that time, and TV Tokyo in July (dawn of Gaia), according to reports by appearances in TV Asahi (morning show), usually, glass is not dissolved in the liquid if it is not a high temperature of at least 1400 degrees, Shiota Mr. room temperature (room temperature Is defined as 15 to 25 ° C. ). However, at present, this liquid glass is only applied to the surface of timber and existing concrete structures, and is mainly used in Japan by material construction using the application method. On the way. Therefore, using this liquid glass and mixing it with ready-mixed concrete manufactured in all countries in a wide range is the manufacturing method of concrete with admixture for preventing deterioration described in this application, and it goes without saying that it is used for infrastructure development in Japan. Since it is necessary to participate in the “One Belt and One Road” concept, which is being promoted mainly by China, and to contribute to the development of global infrastructure, it is natural to supply the “degradation prevention admixture” invented in Japan. It is done. For that, the cooperation of Mr. Masatoshi Shioda of Nikko Co., Ltd., who invents and manufactures liquid glass, is indispensable.

There are various types of admixtures depending on the application. “AE agent” used in most ready-mixed concrete (a large number of independent fine air bubbles are uniformly entrained in concrete for workability and frost resistance. Is a kind of surfactant used to improve water), "water reducing agent / AE water reducing agent", "high performance water reducing agent", "high performance AE water reducing agent", "fluidizing agent" and " There is "setting retarder".
About the composition of the water ratio of the `` liquid glass admixture '' of the present invention and the strength of various ready-mixed concrete, using the liquid glass agent that has already been commercialized, In order to collect various data such as mixing / mixing ratio and strength of ready-mixed concrete with water, by requesting various test data to be used as the basis of the formula composition table, etc. by calculating the amount per unit volume and calculating the amount per batch. For example, for every current JIS A (A is civil engineering and architecture), every three test piece specimens of various types of concrete, 1 week (7 days) and 4 weeks (28 days) The test specimens were subjected to a compressive strength test, the average value was taken as the test result, and liquid glass was coated (coated) on the concrete surface of another three test piece test specimens, and the compressive strength test was performed for comparison. While taking a book The ratio of the degree of concentration of the light deterioration prevention admixture (liquid glass) should be determined by using the liquid glass agent that has already been commercialized, and the ratio of JIS A for each type of concrete water. The mixing ratio of the appropriate water and deterioration prevention admixture is tested by mixing and mixing the test pieces with different mixing ratios, testing the compressive strength test of the test piece specimens every three and one week. , And calculate the amount per unit volume “1 cubic meter”, collect the data as reference values for the JIS A concrete standard, and aim for the JIS standard.

Next, an example of how to mix concrete in a general building is described.
(1) Design conditions, blending conditions, design standard strength: units N / mm2, 28. Extra coefficient: 1,15. Maximum size of coarse aggregate: mm, 25. Slump, cm, 11. Water cement ratio:%, 60. Coarse aggregate rate:%, 39. Unit water volume: Kg / mm3, 152. Air volume:%, 4.5. Next, (2) Use material conditions, selection of admixture: AE water reducing agent + the deterioration preventing admixture is used. Ratio of admixture to cement amount:%, 0.25. Cement type: Ordinary Portland cement. Coarse aggregate type: crushed stone. Fine aggregate type: river sand. Type of admixture: Water reducing agent Pozzolith No. 5L and the admixture. Specific gravity of cement: g / cm3, 3, 15. Specific gravity of coarse aggregate: g / cm 3, 2, 64. Specific gravity of fine aggregate: g / cm 3, 2, 62. Capacity per batch: L, 30. (3) Calculation of the amount per unit volume, 1. Water W, 152Kg. 2. Cement C, 253Kg. 3. Air volume a, 4, 5%. 4. Subtotal 1-3 = 405 kg. Total aggregate A, 1903Kg. 5. Fine aggregate S, 739 kg, 6. Coarse aggregate G, 1164 kg. Total (4-6) 2308 kg. Water reducing agent, 633 g. The admixture. (4) Determination of indication composition (indication recipe), coarse aggregate size: 25 mm. Slump, 11cm. Water cement ratio: 60%. Air volume: 4,5%. Fine aggregate rate: 39%. Unit amount (kg / m3), water W152. Cement C253. Fine aggregate S739. Coarse aggregate G1164. Admixture A633g. In this case, the compounding strength is 32,2 (N / mm2).
Therefore, the building site is manufactured with a raw plant, transported with a mixer truck, and placed with a pump truck.

In concrete design blending, when using the liquid glass admixture, pre-concentrated liquid glass at a water cement ratio, liquid glass prepared and melted at the time of concrete blending is blended according to the design conditions at the water cement ratio, and an appropriate slump By using a mechanism to ensure that the concrete is uniformly disturbed in the production of ready-mixed concrete, it is a 1-week (7 days) and 4-week (28-day) specimen of the ready-mixed material. 1) Moisture permeability test, 2) Water absorption rate test, 3 A test comparing resistance test against oxide ion penetration, 4) resistance test against chemical erosion, "Non-processed test specimen" and "S & TOP test specimen", and products equivalent to existing liquid glass Alternatively, the composition is manufactured by changing the composition ratio and increasing the concentration. Therefore, composition of raw material of liquid glass, 1, Si02 inorganic fine particles, 2, TEOS (tetraethoxysilane) component + alcohol, 3, small amount of binder, 4, Mg (magnesium), V (vanadium), Zn This is a method for producing a concrete containing a deterioration-preventing admixture, which is composed of a small amount of components such as (zinc) and is blended and prepared in the concrete production process as a deterioration-preventing admixture.

This will be described with reference to FIG. Reference numeral 1 represents a tank container for each type of cement, reference numeral 2 represents a coarse aggregate and a gravel pile yard classified into particle diameters of 20 mm or 25 mm or less, 40 mm or less, and 80 mm or less, and numeral 3 represents a fine aggregate and a particle size. It is a sand accumulation yard containing 85% or more of 10 mm or less and 5 mm or less. Reference numeral 4 is a water and fresh water tank or ground water tank container, reference numeral 5 is an admixture container for AE agent, and reference numeral 6 is A liquid glass is used as a container containing a refined anti-deterioration admixture, and the above is generically called a concrete material or simply a material. Reference numeral 7 is a test room for performing the moisture content test of the aggregate surface water of reference numerals 2 and 3, and reference numerals 8-1 to 8-6 are measuring machines for mixing and blending the concrete material. Reference numeral 10 denotes a mixer for charging and mixing each concrete material through a weighing machine. Reference numeral 10 denotes a concrete mixer that controls the measurement and mixing time of each concrete material under computer control, and reference numeral 11 denotes a hopper for loading the concrete mixed with the mixer. In addition, by a ready-mixer transport vehicle (also referred to as a ready-mixer mixer) of reference numeral 12, it is transported to a construction site (civil engineering and architecture) or a precast concrete factory yard and put into a formwork to become a concrete structure or secondary product. Moreover, in the field of shotcrete, coarse aggregate (reference numeral 2 having a particle size of 20 mm or less) is used.

According to Nikko Co., Ltd., concrete is strengthened by chemical changes due to liquid glass, so that neither water permeates nor touches the air, preventing oxidation and neutralization. It is said that the glass that has been vitrified and converted into quartz glass has a permanent effect, and is reborn as concrete having 200 to 800 years. However, this experimental data is data in which liquid glass is applied to the concrete surface layer and infiltrated 5 to 6 mm. However , the existing bridge floor slab and ground cover generate vibration in the traveling vehicle, causing cracking phenomenon. There is also a possibility of cracking from the inside of the concrete even if it is shaken by an earthquake.

As a means for solving the above-mentioned problems in the present invention, liquid glass is refined to a high concentration. By mixing and blending a concrete deterioration-preventing admixture at the time of production of raw concrete, the entire concrete is mixed with liquid glass. Because it is solidified to a high hardness and can prevent cracking due to earthquakes and other vibrations, the useful life of concrete with the admixture is that of 200 to 800 years or more of the method of applying and infiltrating liquid glass. It is possible to expect concrete like new. Of course, the conventional joint material for preventing cracks and the water stop plate for water stop are preferably used at predetermined positions as before. On the other hand, in order to make the world's first deterioration-preventing concrete in this way, the person responsible for handling the concrete blended with the `` deterioration-preventing admixture '' of the present invention acquires basic knowledge of liquid glass, etc. We should also consider introducing a qualification system. Also, if engineers / test managers engaged in ready-mixed concrete manufacturing plants, civil engineering works, construction work sites, secondary product factories, etc., mix the amount of liquid glass that satisfies the design conditions in the concrete with deterioration prevention admixture. It is desirable to consider the development of products for “portable measuring instruments” that perform inspections, and to create a field environment that can be easily examined.

Spraying is a method of covering the slopes of tunnels and cliffs with sprayed mortar or shotcrete. The cliffs that have deteriorated due to weathering, etc. are very effective in blocking outside air, humidity, and seepage water. In addition, it is said to be one of the most widely adopted construction methods because of its high construction performance and excellent workability. It is also widely used for cutting slopes and tunnel lining. Mortar spray is common for general spraying, but concrete spraying (coarse aggregate particle size of 20 mm or less is standard) may occur due to deterioration on cliffs, slopes, tunnels, and the like.

  The method for producing admixture-containing concrete using the liquid glass raw material of the present invention as an anti-degradation admixture is highly effective by curing in a concrete structure and precast concrete or cast-in-place mortar as quartz glass at room temperature. It is a liquid glass characterized by ready-mixed concrete and mortar that prevents deterioration by innovative modifiers that prevent hardness, water resistance, weather resistance, no discoloration, dirt prevention, non-flammability, chemical resistance, static electricity suppression, etc. The concrete with deterioration preventing admixture and its manufacturing method can be expected to be used industrially by bringing economic effects to civil engineering structures and construction works.

It is a manufacturing process flowchart regarding the manufacturing method of the deterioration prevention admixture which uses the liquid glass which showed embodiment of this invention as a raw material. In addition, the coarse aggregate measuring machine of the code | symbol 2 can also be stopped at the time of mortar manufacture.

Description of reference numerals in FIG.
1. Each type of cement.
2. Gravel classified into coarse aggregates with a particle size of 20 mm or 25 mm or less, 40 mm or less, or 80 mm or less.
3. Aggregate containing 85% or more of fine aggregate having a particle size of 5 mm or less is called sand.
4. It means fresh water with water.
5. Admixture refers to AE agent.
6. Refers to a deterioration-preventing mixture obtained by refining liquid glass.
7. Adjust the amount of water mixed with the surface water of coarse aggregate and fine aggregate by water content ratio test.
8-1. Cement weighing machine.
8-2, coarse aggregate weighing machine.
8-3, fine aggregate weighing machine.
8-4 Water meter.
8-5, measuring machine for admixture (AE agent etc.).
8-6, a measuring instrument for deterioration preventing admixture (liquid glass agent).
9, A machine in which materials from 8-1 to 8-6 are put into a mixer (kneader) and stirred.
10. Manufacture ready-mixed concrete by computer control of measuring and mixing time of ready-mixed materials.
11. A place where the manufactured ready-mixed concrete is discharged is called a hopper.
12. A ready-mixed concrete cart that transports ready-mixed concrete from the hopper to the site.

Claims (1)

In the production of ready-mixed concrete (hereinafter also referred to as “ready-mixed concrete”), in the production of ready-mixed concrete, which mixes water, sand, and gravel aggregates in cement with an appropriate amount of admixture according to the application and mixes them with a mixer . The liquid glass raw material is composed of Sio2 inorganic fine particles, TEOS + alcohol, a binder, and the raw material composition composed of Mg, V, and Zn components. Used as a concrete admixture, concentrated liquid glass admixture was manufactured to a ready- mixed concrete mix at a ratio calculated per unit volume under concrete design conditions, and placed in a formwork at the construction site. method for producing a degradation preventing admixture entering concrete characterized by the production of concrete.