JP2011026180A - Ready-mixed concrete guiding material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that although in the initial period for casting a ready-mixed concrete, a method of pumping first a cement or a mortal to piping in order to prevent even to a small extent the ready-mixed concrete from being clogged in the piping of a pump truck has conventionally be employed, the method can prevent the clogging to some extent, but as conventionally, [1] the ready-mixed concrete is clogged in piping, not allowing normal casting work, [2] a cement or a mortal used as a lubricant cannot be used for a structure, so it needs to be carried to a certain designated disposal place, and since it costs much to be disposed of as a waste, and [3] since it is a waste, the environment needs to be taken into account when the waste is disposed of. <P>SOLUTION: The ready-mixed concrete is composed of a mixed powder (in weight: 40-50% calcium carbonate, 20-35% sodium sulfate, 6-10% citric acid, 5-10% ether starch, 3-6% melamine, and 3-6% polyacrylamide). If this developed commercial product composed of the mixed powder thereof is first well mixed with water and flowed (pumped) to the piping of the pump truck when it is cast by the ready-mixed concrete pump truck, it forms a film functioning as a lubricating action inside the piping, and prevents to the utmost the ready-mixed concrete from being clogged, and allows the ready-mixed concrete to be normally casted. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention plays the role of a lubricant by pumping the product of the present invention into the pump car piping first when the concrete is initially placed by the pump car, and the raw concrete is clogged in the pipe of the pump car. It is a raw concrete induction agent devised in order to prevent it to the maximum extent and to enable normal raw concrete placement work. The constitution of the present invention is a bio-conducting agent comprising a mixture of calcium carbonate, sodium sulfate, ether starch, citric acid, polyacrylamide and melamine.

During the operation of pumping raw concrete to a structure with a pump car, there is a problem that the raw concrete is clogged in the piping and prevents normal operation. As an agent, first, cement or mortar was pumped to the pipe as a preceding agent (lubricant), and then raw concrete was placed. However, when cement or mortar is used as a lubricant, those residues adhere to the inner wall of the pump car. As a result, the ready-mixed rice cake becomes hard and becomes clogged easily. As a result, there was a problem in that the operation of placing the live control by a pump car could not be performed normally.

In addition, when cement or mortar is used as a leading agent (lubricant) as in the past, once placed cement or mortar cannot be used for structures due to strength problems and must be treated as waste. There must be. However, it takes considerable time and money to process these. First, in order to dispose of the waste, it is necessary to transport the waste to a certain designated processing place, and there is a problem that the processing is expensive.

Further, when cement or mortar is used as a lubricant (preceding agent) as in the prior art, it is necessary to discard the used cement or mortar.

Problems to be solved by the invention

According to the present invention, (1) the conventional pipes are clogged with raw concrete and cannot be placed normally. (2) Cement or mortar used as a lubricant cannot be used in a structure. It must be transported to a certain designated processing place, and it is expensive to process as waste. (3) Since it is waste, it is necessary to consider the environment when processing it. These problems can be solved by using the product of the present invention as an alternative product.

Means for solving the problem

The present invention has a conventional problem (the problem of clogging of cement and mortar residue due to solidification of the cement and mortar residue in the pump car piping, the cement and mortar passing through the piping cannot be used for structures, and are treated as waste. The problem of having to transport to a certain place to dispose of it, the problem of giving consideration to the environment to dispose of it, and the problem of disposing of a considerable amount of disposal costs) It was devised to improve. The present invention comprises a powder mixture (wt%: calcium carbonate 40-50%, sodium sulfate 20-35%, citric acid 6-10%, ether starch 5-10%, melamine 3-6%, polyacrylamide 3 -6%). The product of the present invention composed of such a mixture, when placing the ready-mixed container with a pump car, first mix the developed product well with water and flow (pump) it into the pipe of the pump car. A film that performs a lubricating action is formed to prevent clogging of raw concrete to the maximum, and normal raw concrete can be placed.

The invention's effect

At the initial stage of placing raw concrete, conventionally, the cement or mortar was first flowed into the pipe (pumping) in order to prevent the raw concrete from being clogged in the pump car piping. However, since it is not a dedicated lubricant, it cannot be expected to have a significant effect, and problems that occur when cement or mortar is used (cement or mortar residue clumps in the pump car piping. The problem is that the pipes are clogged by the pipe, the cement and mortar passed through the pipes cannot be used in the structure, and it is necessary to dispose of them as waste. However, for the problem of environmental considerations, and the question that requires considerable processing costs to dispose), use this developed product. It can be improved. Since this developed product is a product developed as a dedicated lubricant, cement and mortar do not get stuck in the pipe, and can be prevented from clogging to the maximum extent. Unlike the use of cement or mortar as a lubricant, the newly developed product has almost no waste, so it does not need to be transported to a certain disposal site for disposal, and it is not expensive to dispose of it. . Furthermore, unlike the case where cement or mortar is used as a lubricant, there is almost no waste, so this product is more environmentally friendly than conventional methods.

The present invention comprises a powder mixture (weight: calcium carbonate 40-50%, sodium sulfate 20-35%, citric acid 6-10%, ether starch 5-10%, melamine 3-6%, polyacrylamide 3- 6%). Consists of these mixtures.

Calcium carbonate, which is one of the constituents of the present invention, is a calcium carbonate salt and is naturally produced as limestone, paint, marble, calcite and the like. When heated, it decomposes into carbon dioxide and calcium oxide. Difficult to dissolve in water. Used as a neutralizer for cement, pigment and acidic soil. The chemical formula is CaCO ₃ .

Calcium carbonate, which is one of the components of the present invention, can be obtained by heating sulfuric acid. Anhydrides are used in the manufacture of desiccants and glass. Also, hydrate crystals can be obtained from a solution obtained by neutralizing sodium carbonate or sodium hydroxide with sulfuric acid. It is a typical hot spring material, and hot springs containing alkali metal and alkaline earth metal sulfates such as sodium sulfate are generally called sulfate springs and sulfate springs. It is one of the highly safe substances for the human body and is used together with sodium hydrogen carbonate as the main component of home bathing agents. The scientific formula is Na ₂ SO ₄ .

Citric acid, which is one of the components of the present invention, is an organic acid contained in a large amount in citrus fruits. Chemical formula C ₆ H ₈ O ₇ Colorless and odorless crystals with a refreshing acidity and easy to dissolve in water. Used in soft drinks, medicines, mordants, pharmaceutical cosmetics, detergents, etc. In addition, it has a neutralizing action necessary to prevent rapid cementation. The chemical formula is C6H8O7.nH2O (n = 0 or 1).

Ether starch, which is one of the present invention, is an organic substance, and basically consists of carbon, hydrogen and oxygen. Ether molecules are commonly volatile, anesthetic and flammable, and are hardly soluble in water. However, since it dissolves well in organic compounds and is chemically stable, ether in the liquid state is often used as a solvent body that dissolves organic substances. Ether vapor is also used as soil pesticides and pharmaceutical anesthetics.

Melamine is an organic compound and is a kind of organic nitrogen compound having a triazine ring at the center of the structure. Along with formaldehyde, methylolmelamine, which is the main raw material for melamine resin, becomes a raw material for thermosetting resin (melamine resin), and most of the produced melamine is used for synthetic resins. Melamine resins are excellent in terms of heat resistance, water resistance, mechanical strength and the like, and are industrially produced in large quantities.
Colorless crystals obtained by reacting urea with ammonia under high pressure or heating dicyandiamide under high pressure. Dissolves in hot water. It is a raw material for melamine resin, and its molecular formula is C ₃ H ₆ N ₆ .
It can be obtained by reacting dicyandiamide with liquid ammonia under pressure. Colorless columnar crystals with sublimation properties. Although it is quite soluble in hot water, it is difficult to dissolve in cold water and ethanol (ethyl alcohol) and not in ether. When heated with formaldehyde, it is polycondensed into a melamine resin, which is important as a raw material. Melamine resins are excellent in water resistance, heat resistance, etc., and are therefore used in molded articles such as tableware and paints.

When acrylamide melts, it undergoes a violent polymerization reaction and becomes [polyacrylamide, which is a polymer compound].
Polyacrylamide is a kind of water-soluble synthetic resin. It is mainly used as flocculant for wastewater treatment, dry paper strength enhancer for papermaking, and filtering agent, as well as fiber auxiliary, laundry glue, adhesive, synthetic glue, Widely used in paints. In addition, when dissolved in water, there is a viscous force, and the effect of lubrication is achieved using the characteristics.

Claims (1)

The present invention comprises a powder mixture (weight: calcium carbonate 40-50%, sodium sulfate 20-35%, citric acid 6-10%, ether starch 5-10%, melamine 3-6%, polyacrylamide 3- 6%). Consists of these mixtures.