JP2014051398A - Cavity filler for air milk and air mortar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cavity filler for an air milk and an air mortar, having high safety and reducing effects on human bodies or environment, and having long term stability even when mixed with a cement and the like in advance.SOLUTION: A powder hydrocarbon-based surfactant and/or a powder protein-based surfactant and a hydraulic solidifying agent are mixed.

Description

  The present invention relates to a cavity filler used in producing air milk and air mortar.

  Conventionally, in air milk and air mortar, a foaming agent is mixed and stirred in advance with water, and bubbles produced using a foaming machine or the like are added to cement slurry (preform method), or a foaming agent is added to water. It is made by a method such as mixing with a mixer and foaming, adding other materials such as cement and aggregate, and foaming while stirring again (mix foam method). And the air mortar produced by any of the above methods was put into a hopper or the like and filled in the filling place by pumping.

  However, in the conventional methods for producing air milk and air mortar, since the foaming agent is liquid, the foaming agent is diluted with water and used at the construction site of air milk and air mortar. There is a problem that its usage is limited.

  The foaming agent is added with a large amount of various organic solvents in order to improve the dissolution stability of the surfactant and various additives contained in the foaming agent. However, since many of these organic solvents are designated as hazardous materials, handling them requires great care, and there is a problem that the working efficiency is remarkably lowered.

  On the other hand, instead of the liquid foaming agent, some powdered foaming agents are also commercially available. However, when air milk and air mortar are produced by the above-described conventional production method, the foaming agent of this powder is excellent in foaming power, but has a problem that the bubble stability is extremely low and quality varies.

  Therefore, in the following Patent Document 1, a foaming component mainly composed of a hydrocarbon-based surfactant and / or a protein-based surfactant is used as an inorganic powder that is hardly soluble or insoluble in water and an organic solvent, and A powder foaming agent for foam mortar supported on organic powder has been proposed.

  This conventional powder foaming agent for foam mortar is impregnated with inorganic foam that is insoluble in water and organic solvents and liquid foaming agent in organic powder. A foaming agent for cell mortar can be obtained.

  However, the conventional foaming agent for foam mortar is not very safe because the foaming agent mainly composed of a liquid surfactant contains an organic solvent. Even in the foaming agent containing the protein of the above as the main component, it is difficult to say that it is very safe because it contains iron salt etc. There is.

  Furthermore, when this conventional foaming agent for foam mortar is mixed with cement or the like in advance, considering the long term, these foaming agents contain moisture and organic solvent, so cement There is a problem that the cost and work efficiency cannot be improved because the mixing ratio is limited.

JP 2004-83339 A

  The present invention has been made in view of such circumstances, is highly safe, reduces the influence on the human body and the environment, and has a long-term stability for air milk and air mortar even when previously mixed with cement or the like. An object of the present invention is to provide a hollow filler.

  In order to solve the above problems, the invention described in claim 1 is characterized in that a powdered hydrocarbon surfactant and / or a powdered protein surfactant and a hydraulic solidifying agent are mixed. .

The invention according to claim ₂ is the ultrafast cement according to the invention according to claim 1, wherein the hydraulic solidifying agent is calcium fluoroaluminate (11CaO · 7Al ₂ O ₃ · CaF ₂ ) as a main component. , One or more selected from ultra-fast cement containing amorphous calcium aluminate, Irwin cement containing Irwin, and fast-curing cement mainly composed of calcium silicate and calcium aluminate It is characterized by.

  According to the present invention described in claims 1 and 2, in order to mix a powdered hydrocarbon surfactant and / or a powdered protein surfactant and a hydraulic solidifying agent, the powdered hydrocarbon system is added to the foaming agent. It is not necessary to use an iron salt in the case of using a surfactant in an organic solvent or in the case of the powdered protein surfactant used as a foaming agent, so there is no influence on the human body and the environment, and it can be used safely. Air mortar can be obtained. Thereby, for example, even when producing a small amount of air milk and air mortar, it can be easily produced using a plastic bucket or the like.

  In preparation of air milk and air mortar, the above foaming agent is mixed with water in advance and agitated, and the foaming method is added to the cement slurry by adding foaming agent to water. Air milk and air mortar with excellent foaming power and foam stability can be obtained in any of the mixed foam systems that are agitated with a mixer and foamed, and then added with other materials such as cement and aggregate and foamed while stirring again. be able to.

According to the second aspect of the present invention, the hydraulic solidifying agent is an ultrafast cement or amorphous calcium aluminate mainly composed of calcium fluoroaluminate (11CaO · 7Al ₂ O ₃ · CaF ₂ ). Since it is one or two or more types selected from ultra-fast-hardening cement containing, Irwin-containing cement containing Irwin, and fast-hardening cement mainly composed of calcium silicate and calcium aluminate, When air milk and air mortar prepared by a preform method that mixes and stirs with water in advance and adds the bubbles produced using a foaming machine to the cement slurry are filled in the filling place using a pump or the like in a short time. It can be solidified efficiently and work efficiency can be improved.

  The hollow filler for air milk and air mortar of the present invention includes, for example, an anionic surfactant or a nonionic surfactant as a powdered hydrocarbon surfactant which is a foaming component. Among these powdered hydrocarbon surfactants, those that can be suitably used are powdered anionic surfactants. The main anionic surfactants of this powder include alpha olefin sulfonate, alkylbenzene sulfonate, alkyl sulfate ester salt, fatty acid soap and the like. The main nonionic surfactants for powders include glycerin esters and fatty acid esters.

  Examples of the powder protein surfactant that is a foaming component include keratin powder, collagen powder, casein powder, and soybean powder.

  As these foaming components, in one embodiment of the present invention, one or a combination of two or more powdered hydrocarbon surfactants and powdered protein surfactants are used.

Examples of the hydraulic solidifying agent include, for example, a so-called ultrafast cement containing calcium fluoroaluminate (11CaO · 7Al ₂ O ₃ · CaF ₂ ) as a main component, an ultrafast cement containing amorphous calcium aluminate, Examples include erwin cement containing erwin and alumina cement.

In one embodiment of the air filler for air milk and air mortar of the present invention, a predetermined amount of a powder foaming component, for example, an alpha olefin sulfonate which is an anionic surfactant of powder, and hydraulic solidification It can be obtained by stirring and mixing an agent, for example, a super fast hard cement mainly composed of calcium fluoroaluminate (11CaO · 7Al ₂ O ₃ · CaF ₂ ) with a generally used mixer or the like.

  In addition, when using the hollow filler for air milk and air mortar of the present invention, for example, when a predetermined amount of a bag in which a powder foaming component and a hydraulic solidifying agent are blended at a predetermined ratio is completely used. It can be used as it is without stirring and mixing in the mixer. In addition, when a single bag of the above-mentioned hollow filler is used, the powder foaming component calculated in a predetermined amount is put in a water-soluble bag, and the bag is put in a bag containing a predetermined amount of a hydraulic solidifying agent. A method is also possible.

  As described above, for example, a small-scale construction site is filled using a hollow filler for air milk and air mortar obtained by mixing a predetermined amount of a powder foaming component and a hydraulic solidifying agent. First, make a small amount of air milk. At that time, prepare a plastic bucket, put a predetermined amount of water into this plastic bucket, add a predetermined amount of the above-mentioned air milk and air mortar hollow filler mixed in a predetermined amount to it. The air milk is prepared by sufficiently stirring with a hand mixer.

In this case, a predetermined amount of a bag contains a predetermined amount of a foaming foaming component, for example, an alpha olefin sulfonate which is a powdered anionic surfactant, and a hydraulic solidifying agent such as calcium fluoroaluminate ( 11CaO · 7Al ₂ O ₃ · CaF ₂ ) as a main component is blended.

  Next, the produced air milk is transported to a filling place and filled in the plastic bucket as it is. Moreover, it is also possible to put the produced air milk into the popper from the plastic bucket and fill the filling place by pumping.

In addition, when a large amount of air milk is filled in a large-scale filling place, a predetermined amount of water, a predetermined amount of air milk and a hollow filler for air mortar are added and stirred using a mixer such as a grout mixer. Proceed well to make air milk. At this time, the air filler for air milk and air mortar includes a predetermined amount of powder foaming component, for example, an alpha olefin sulfonate which is an anionic surfactant of powder, and a hydraulic solidifying agent, for example, calcium. A super fast hard cement mainly composed of fluoroaluminate (11CaO · 7Al ₂ O ₃ · CaF ₂ ) is stirred and mixed with a generally used mixer or the like.

  And the air milk produced with the said grout mixer is thrown into the hopper etc. from the said grout mixer, and a filling place is filled with pumping.

  The hollow filler for air milk and air mortar according to the present invention may be one or two of the following substances, as required, within a range not impeding the performance of the hollow filler for air milk and air mortar. The above can be used in combination.

  Examples of the substance include higher alcohols such as lauryl alcohol, fatty acids such as stearic acid, cellulose derivatives such as methyl cellulose, water-soluble polymers such as polyvinyl alcohol, synthetic thickeners such as sodium polyacrylate, guar gum, etc. Natural thickeners, plant or crustacean extracts such as chitosan, carboxylic acid surfactants such as amino acid surfactants, inorganic salts such as water glass chemicals and aluminum salts, or sodium salts and calcium salts Water-soluble inorganic metal salts, fibrous clay minerals such as kaolin mineral and attapulgite, amorphous clay minerals such as imogolite, or clay minerals such as silica minerals and dolomite and their calcined products, polycarboxylic acids and naphthalene sulfonic acids, etc. Water reducing agent, naphthalene-based, polycarboxylic acid-based or acrylic acid sodium A dispersing agent such as Umm.

  Furthermore, the air milk and air mortar filler of the present invention can be used by preparing air mortar by kneading the water and aggregates in addition to water. Moreover, it is also possible to produce a blended product in which the above-mentioned aggregate and, if necessary, a water reducing agent, a dispersing agent, various cement admixtures, etc., are mixed in the air milk and air mortar filler of the present invention. is there. In this case, since the air mortar can be produced simply by kneading the above blended product and water at the construction site, the work of measuring the blended components in the field work can be omitted, and the work efficiency can be improved. , Weighing errors can be eliminated.

  In addition, regarding the aggregate to be mixed with the air milk and air mortar filler of the present invention, since there is no particular restriction on the type, ordinary sand such as river sand, mountain sand, sea sand, crushed stone powder sand, Examples include blast furnace slag fine powder, admixtures such as fly ash and silica fume, lightweight aggregates such as pearlite and shirasu balloon, locally generated soil, limestone, crushed stone, and quartz sand. Moreover, tap water, groundwater, seawater, etc. can be used as water used when kneading.

  Furthermore, when producing air milk or air mortar, if it does not inhibit the foaming properties of the hollow filler for the air milk and air mortar of the present invention, and does not inhibit the solidification and strength of the hydraulic curing agent, Various cement admixtures conventionally used can be used in combination as required. Conventional cement admixtures conventionally used include, for example, cure retarders (polyphosphate, citrate, etc.), cure accelerators (calcium chloride, etc.), shrinkage reducing agents (lower alcohols, etc.), water repellents. (Higher fatty acids etc.), quick setting agents (calcium aluminate etc.), blast furnace slag, silica fume, gypsum, volcanic ash and the like.

  In addition, as lightweight air milk or air mortar in which the hollow filler of the present invention can be used, concrete or mortar placed on site used for civil engineering and construction, or various concrete and mortar secondary products produced in factories These are various cement-based hardened bodies that require weight reduction.

  In addition, when the air milk and air mortar filler of the present invention is used, the air filler or air mortar is produced by stirring the cavity filler together with other materials such as water and aggregate while stirring with a mixer. It is possible to use a mixed foam method, or in some cases, a preform method in which the hollow filler is mixed and stirred in advance with water and air milk or air mortar is produced by a special foaming apparatus.

  Furthermore, the method of adding the hollow filler for air milk and air mortar according to the present invention is performed even when mixing in the order of water, hollow filler, and aggregate, and also in the order of hollow filler, water, and aggregate. Even when the order of addition is appropriately changed, the performance of the air mortar produced is not affected.

  And the construction method of the concrete using air milk or air mortar produced using the air milk and air mortar filler of the present invention can use the conventional construction method, filling the mold, It can be constructed by various methods such as pouring with a caulking gun. Further, the curing method may be any of air-drying curing, wet-air curing, heating accelerated curing (steam curing, autoclave curing, etc.), and each curing method may be used in combination.

  Next, the hollow filler for air milk and air mortar according to the present invention will be specifically described with reference to examples. However, the present invention is not limited to the following examples.

[Examples 1 to 5]
Using the foamable component (A) and hydraulic solidifying agent (B) shown in Table 1, they are mixed at a ratio of (A) :( B) = 1.5: 100 (mass ratio), and shown in Table 2. Cavity fillers for air milk and air mortar having such a combination of compositions were prepared as Examples 1-5.

[Comparative Examples 1-2]
In addition, “Lipon PS-860” which is a commercially available powder foaming agent (sodium alkylbenzene sulfonate: trade name manufactured by Lion Co., Ltd.) and “Sumishield” which is a commercially available liquid foaming agent for air mortar (main component) : Liquid hydrocarbon surfactant: Sumitomo Osaka Cement Co., Ltd. product name) for comparison, and Comparative Example 1 and Comparative Example 2 were used.

  Here, creation of air milk will be described. First, in Examples 1 to 5, the prototypes prepared in Table 2 were introduced into a 40 L container at the ratio shown in Table 3, water was added thereto, and the mixture was stirred and mixed for 1 minute with a hand mixer. Produced. And in the comparative example, the super-fast hard cement, the foaming agent and water were added to a 40 L container at the ratio shown in Table 4, and mixed for 1 minute with a hand mixer to produce air milk.

And the density and flow value of the air milk produced in Examples 1-5 and Comparative Examples 1-2 were measured by the following methods (1) and (2).
(1) Measurement of density: A sample was filled in a measuring cup having an internal volume of 1000 cm ³ , and the weight per 1000 cm ³ was measured to calculate the density.
(2) Measurement of flow value: In accordance with the cylinder method of the consistency test method of the NEXCO test method “Test method of air mortar and air milk (test method 313-1999)”, the cylinder is 8 cm in inner diameter and 8 cm in height. The sample was put in, and the diameter of the sample bottom after drawing was measured.

  Next, this air milk was poured into a φ5 × 10 cm mold and subjected to wet air curing (20 ° C., 24 hours) to observe the presence or absence of air milk subsidence. The results are summarized in Table 5.

  And as an evaluation method about the air milk of Examples 1-5 and Comparative Examples 1-2, first, the evaluation in the density after stirring using a hand mixer, and the density and the presence or absence of subsidence of the air milk are combined. Was evaluated. In the evaluation, the density range of 0.4 to 0.9 was set as “◯”, and the outside range was set as “X”.

  In this evaluation method, the reason why the density is in the range of 0.4 to 0.9 is “◯” because the density is 0.4 or less, the compressive strength is insufficient, and the stability of air milk self-supporting is insufficient. This is because if the density is 0.9 or more, the compressive strength becomes too large and the volume when kneaded becomes small, which is not economically suitable. And as comprehensive evaluation, it was set as "(circle)" when the density was in the range of 0.4-0.9 and the subsidence of the air milk was "None", and otherwise set as "X".

  From the results of Table 5 showing the above evaluation, the air milk and mortar hollow filler of the present invention is superior in foaming property and air bubble stability as compared with air milk or air mortar prepared with a commercially available liquid foaming agent. It was found to have sex.

  According to the hollow filler for air milk and air mortar according to the above-described embodiment, the powder hydrocarbon surfactant and / or the powder protein surfactant and the hydraulic solidifying agent are mixed, When using a powdered hydrocarbon surfactant, there is no need to use an iron salt in the case of an organic solvent and a foam protein surfactant in the case of the powdered protein surfactant, so there is no impact on the human body or the environment. Air mortar that can be used can be obtained. Thereby, for example, even when a small amount of air mortar is manufactured, it can be easily manufactured using a plastic bucket or the like.

  In preparing air milk or air mortar, the air milk and air mortar hollow filler are prepared by mixing and stirring the foaming agent with water in advance, and adding bubbles produced using a foaming machine or the like to the cement slurry. In either the preform method or the mixed foam method in which a foaming agent is added to water and agitated with a mixer or the like, and foamed while stirring again by adding other materials such as cement or aggregate. As shown, air milk or air mortar excellent in foaming power and bubble stability can be obtained.

The hollow filler for the air milk and the air mortar is characterized in that the hydraulic solidifying agent is a super fast cement, amorphous calcium aluminum whose main component is calcium fluoroaluminate (11CaO · 7Al ₂ O ₃ · CaF ₂ ). Since it is one or two or more types selected from super fast-hardening cement containing nate, Irwin-containing cement containing Irwin, and fast-hardening cement mainly composed of calcium silicate and calcium aluminate, When air milk or air mortar produced by the foam method is filled in a filling place using a pump or the like, it can be solidified efficiently in a short time, and work efficiency can be improved.

  It can be used to produce air milk and air mortar that fills cavities and the like.

Claims (2)

  A hollow filler for air milk and air mortar, wherein a powdered hydrocarbon surfactant and / or a powdered protein surfactant and a hydraulic solidifying agent are mixed. The hydraulic solidifying agent, ultrarapid cement consisting mainly of calcium fluoroaluminate _{(11CaO · 7Al 2 O 3 ·} CaF 2), ultrafast cement containing amorphous calcium aluminate, Irwin system containing Irwin The cavity filler for air milk and air mortar according to claim 1, wherein the filler is one or more selected from cement, quick-hardening cement mainly composed of calcium silicate and calcium aluminate.