JP2012184127A - Construction method of lightweight mortar, and the lightweight mortar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method capable of curing quickly lightweight mortar containing cement, a resin foam, and an inorganic lightweight aggregate.SOLUTION: A liquid containing 100 pts.mass cement, a 1-20 pts.mass resin foam having a ≤0.1 kg/L unit volume mass, a 10-100 pts.mass inorganic lightweight aggregate having a ≤0.6 kg/L unit volume mass, and water which are stored in an A-liquid container 21, and B liquid containing a quick-setting agent which is stored in a B-liquid container 22 are sprayed onto a wall surface 50 according to following procedures. First of all, the A liquid is sent into a tube 11, and simultaneously the B liquid is sent into a tube 12, and further air is sent into a tube 34 from a compressor 33. First, the tube 34 is joined to the tube 12, then the tube 12 is joined to the tube 11 to mix the A liquid with the B liquid, and a mixture 23 is sprayed from a spray nozzle 14 toward the wall surface 50.

Description

The present invention relates to a method for constructing a lightweight mortar containing cement, a resin foam, and an inorganic lightweight aggregate that is constructed on a building or the like. Moreover, it is related with the lightweight mortar obtained by the construction method.

  Conventionally, lightweight mortar containing cement, resin foam, and inorganic lightweight aggregate has been used as a heat insulating material in buildings. For example, Patent Literature 1 describes a heat insulating material containing cement, shirasu balloon, and urethane foam or polystyrene.

  However, sufficient studies have not been made on the curability of lightweight mortar containing cement, resin foam, and inorganic lightweight aggregate.

  On the other hand, as a method of quickly hardening mortar or concrete using cement as a binder, there is a method of mixing them with a liquid quick-setting agent immediately before the construction of mortar or concrete (for example, Patent Document 2).

Japanese Patent Laying-Open No. 2005-281051 (Claims etc.) JP 2002-129895 A (Claims etc.)

  Lightweight mortar containing cement, resin foam, and inorganic lightweight aggregate contains about 1 to several times as much water as cement contained in the lightweight mortar at the time of construction, and is constructed as a heat insulating material. In some cases, it took time to cure due to the thick construction thickness. Therefore, when it is constructed on the wall surface or ceiling surface of a building, there is a problem that it is easy to sag due to its own weight until it is cured. In particular, when installing by spraying, considering the suitability of the material for the spraying coating machine, the amount of water added to the lightweight mortar is often increased to set the viscosity low, and this problem is remarkable. Met.

  In addition, methods for quickly curing mortar and concrete using cement as a binder have been studied, but sufficient consideration has been given to methods for quickly curing lightweight mortar containing cement, resin foam, and inorganic lightweight aggregate. Was not.

  This invention solves the said problem, Comprising: It aims at providing the construction method which hardens the lightweight mortar containing a cement, a resin foam, and an inorganic lightweight aggregate rapidly.

  Moreover, it aims at obtaining the lightweight mortar obtained by making it harden | cure rapidly, Comprising: It was excellent in heat insulation.

  As a method for solving the above problems, the invention according to claim 1 is characterized in that 100 parts by mass of cement, 1 to 20 parts by mass of a resin foam having a unit volume mass of 0.1 kg / L or less, and a unit volume mass of 0.6 kg. A lightweight mortar construction method containing 10 to 100 parts by weight of an inorganic light aggregate of / L or less and a quick setting agent, and a liquid A containing cement, a resin foam, an inorganic light aggregate and water, It is characterized by mixing B liquid containing a quick setting agent before construction.

  Invention of Claim 2 is the construction method of the lightweight mortar of Claim 1, 60-100 mass% in the whole quantity of the said inorganic lightweight aggregate is an inorganic lightweight aggregate whose water absorption is 10 mass% or less. It is characterized by being.

  Invention of Claim 3 is a construction method of the lightweight mortar of Claim 1 or 2, The solid content of the quick setting agent which occupies in said B liquid is 20-60 mass%, It is characterized by the above-mentioned.

Invention of Claim 4 is the construction method of the lightweight mortar in any one of Claims 1-3, The said quick setting agent is silicate, Comprising: With respect to 100 mass parts of cement in A liquid The liquid A and the liquid B are mixed so that the solid content of the quick setting agent in the liquid B is 10 to 40 parts by mass.

The invention according to claim 5 includes 100 parts by mass of cement, 1 to 20 parts by mass of a resin foam having a unit volume mass of 0.1 kg / L or less, and an inorganic lightweight aggregate 10 having a unit volume mass of 0.6 kg / L or less. It is a lightweight mortar obtained by curing a mixture containing ˜100 parts by mass, a quick setting agent, and water.

  According to the construction method of the lightweight mortar of Claim 1, the lightweight mortar containing a cement, a resin foam, and an inorganic lightweight aggregate can be hardened rapidly.

  According to the construction method of the lightweight mortar of Claims 2-4, in addition to the effect of Claim 1, a lightweight mortar can be hardened more rapidly.

The lightweight mortar according to claim 5 is excellent in heat insulation.

  The present invention includes 100 parts by mass of cement, 1 to 20 parts by mass of a resin foam having a unit volume mass of 0.1 kg / L or less, 10 to 10 parts by mass of an inorganic lightweight aggregate having a unit volume mass of 0.6 kg / L or less, and A method for constructing a lightweight mortar containing a binder, in which a liquid A containing cement, a resin foam, an inorganic lightweight aggregate and water and a liquid B containing a rapid setting agent are mixed immediately before construction. By mixing the A liquid and the B liquid before construction, the constructed mixture is quickly cured.

The lightweight mortar preferably has an apparent specific gravity of 0.1 to 1.0 (particularly preferably 0.2 to 0.5), and the cement, the resin foam, and the inorganic lightweight aggregate are mixed. If it is used in proportion, it can be easily manufactured. Lightweight mortar is mainly used as a heat insulating material for buildings and the like. If the apparent specific gravity is too small, the strength (compressive strength, bending strength, etc.) is weak and the shape tends to collapse, and if the apparent specific gravity is too large, the thermal conductivity is large and sufficient heat insulation cannot be obtained. By using the resin foam and the inorganic lightweight aggregate in the above mixing ratio, a lightweight mortar excellent in strength and heat insulating properties can be obtained.

The liquid A is a fluid obtained by mixing cement, water, resin foam, inorganic lightweight aggregate, and other additives. Therefore, the property of the A liquid is not particularly limited as long as it has fluidity. For example, it may have properties such as a high-viscosity fluid, fresh concrete, or fresh mortar.
The water content is preferably about 80 to 250 parts by mass with respect to 100 parts by mass of cement. If the content of cement, resin foam, and inorganic lightweight aggregate is in the above range and the water content is in this range, mixing is easy and the workability is excellent.

  The cement is not particularly limited as long as it is a hydraulic cement. For example, normal Portland cement, early-strength Portland cement, ultra-early strength Portland cement, medium heat Portland cement, low heat Portland cement, sulfate-resistant Portland cement, blast furnace cement Various cements such as fly ash cement, white Portland cement, ultrafine particle cement, high belite cement, ultrafast cement, alumina cement, and ecocement can be used.

The resin foam is a porous body obtained by foaming a synthetic resin. For example, foamed polystyrene, foamed urethane, foamed phenol, foamed polyethylene, foamed polypropylene, or the like can be used. If these resin foams have a unit volume mass of 0.1 kg / L (liter) or less (more preferably 0.05 kg / L or less, particularly preferably 0.03 or less), the specific gravity is 0.1 to 1. 0, a lightweight mortar excellent in heat insulation and strength can be easily obtained. The resin foam having a unit volume mass exceeding 0.1 kg / L needs to increase the volume of the resin foam in the light weight mortar, and the heat insulation of the light weight mortar cannot be increased efficiently. Further, when the volume of the resin foam in the light weight mortar increases, the bending strength of the light weight mortar decreases.
The unit volume mass may be measured according to JIS A1104 (2006).

Although the lower limit of the unit volume mass of the resin foam is not particularly limited, it is preferably 0.005 kg / L or more. Thereby, it becomes easy to obtain a lightweight mortar excellent in strength. A resin foam having a unit volume mass that is too small has low strength, and is easily damaged or deformed when mixed with cement or the like. Moreover, the intensity | strength of lightweight mortar also becomes weak by including a resin foam with weak intensity | strength.

In addition, the foaming means, the molding method, etc. of the resin foam are not particularly limited. For example, in the case of expanded polystyrene, bead method expanded polystyrene (EPS), extruded expanded polystyrene (XPS), or the like can be used. In order to obtain a predetermined particle diameter, these may be used by crushing the molded body, or pre-expanded beads before molding may be used.

The resin foam preferably has a particle diameter of 10 mm or less (preferably 8 mm or less). Since the resin foam does not have good adhesion with cement as a binder for lightweight mortar, it is preferable to disperse fine particles in the lightweight mortar. Thereby, a lightweight mortar with excellent strength can be obtained. If the particle size is too large, the bending strength of the lightweight mortar tends to be weakened. In addition, when a particle having a large particle size is included, problems such as difficulty in smoothing the surface of the light weight mortar and the workability at the time of molding the light weight mortar and the finish of the light weight mortar are likely to occur.
The particle size of 10 mm or less is the size of particles that can pass through a sieve having an opening of 10 mm.

Although the lower limit of the particle diameter of the resin foam is not particularly limited, it is preferably a size exceeding 0.3 mm (preferably 0.5 mm, particularly preferably 1 mm). Thereby, it becomes easy to obtain a lightweight mortar excellent in curability. When many particles having a small particle diameter are used, the amount of water added to the liquid A increases, and therefore, curing tends to take time.
The size exceeding the particle diameter of 0.5 mm is the size of particles that do not pass through a sieve having an opening of 0.5 mm.

  The content of the resin foam is preferably 1 to 20 parts by mass (more preferably 1 to 10 parts by mass, particularly preferably 1 to 4 parts by mass) with respect to 100 parts of cement. If the content is within this range, a lightweight mortar having a specific gravity of 0.1 to 1.0 and excellent in heat insulation and strength can be obtained.

The inorganic lightweight aggregate can be used as long as it is inorganic with a unit volume mass of 0.6 kg / L or less, and its shape, composition, etc. are not particularly limited. For example, perlite, vermiculite, shirasu balloon, glass foam, diatomaceous earth, or the like can be used. By using one having a unit volume mass of 0.6 kg / L or less, a lightweight mortar having a specific gravity of 0.1 to 1.0 and excellent in heat insulation and strength can be easily obtained. The inorganic lightweight aggregate exceeding the unit volume mass of 0.6 kg / L needs to increase the volume of the inorganic lightweight aggregate in the lightweight mortar, and the heat insulation property of the lightweight mortar cannot be increased efficiently.
The unit volume mass may be measured according to JIS A1104 (2006).

The lower limit of the unit volume mass of the inorganic lightweight aggregate is not particularly limited, but is preferably 0.03 kg / L or more. Thereby, it becomes easy to obtain a lightweight mortar excellent in heat insulation and strength. Those whose unit volume mass is too small have low strength, and are easily damaged or deformed when mixed with cement or the like. If the lightweight aggregate is damaged or deformed, the thermal insulation of the lightweight mortar may not be increased efficiently. Moreover, the intensity | strength of lightweight mortar also becomes weak by including the inorganic lightweight aggregate with weak intensity | strength.

It is preferable that 60-100 mass% (more preferably 70-100 mass%) in the total amount of the inorganic lightweight aggregate is an inorganic lightweight aggregate having a water absorption of 10 mass% or less. If water with a low water absorption rate is used, the amount of water added to the liquid A can be reduced, so that it becomes easy to cure when the liquid B containing the quick setting agent is mixed, and the time required for curing and drying the lightweight mortar. Is shortened. In addition, the liquid A in which cement, resin foam, inorganic lightweight aggregate and water are mixed, like an ordinary mortar, is clogged after mixing and decreases in fluidity, but the inorganic lightweight aggregate having a low water absorption rate is reduced. By using, the fall of fluidity | liquidity can be reduced and A liquid excellent in workability can be obtained. Examples of the inorganic lightweight aggregate having a water absorption of 10% by mass or less include a porous glass foam obtained by granulating and firing glass powder. Among such porous glass foams, the water absorption is small if it has many independent pores. On the other hand, in most cases, pearlite, vermiculite, shirasu balloon, diatomaceous earth and the like have a water absorption rate exceeding 10% by mass.
In addition, what is necessary is just to measure the water absorption rate of an inorganic lightweight aggregate according to JIS A1134 (2006).

  In addition, if the thing of unit volume mass 0.1kg / L or more is used as an inorganic lightweight aggregate with a water absorption of 10 mass% or less, the intensity | strength of a lightweight mortar can be made stronger. Examples of the inorganic lightweight aggregate having a water absorption rate of 10% by mass or less and a unit volume mass of 0.1 to 0.6 kg / L include a porous glass foam obtained by granulating and firing glass powder.

The inorganic lightweight aggregate preferably has a particle size of 8 mm or less (more preferably 5 mm or less, particularly preferably 3 mm or less). Thereby, it becomes easy to obtain a lightweight mortar excellent in heat insulation and strength. An inorganic lightweight aggregate having a large particle size is likely to be damaged or deformed when mixed with cement or the like, and the thermal insulation of the lightweight mortar may not be increased efficiently. In addition, when a particle having a large particle size is included, problems such as difficulty in smoothing the surface of the light weight mortar and the workability at the time of molding the light weight mortar and the finish of the light weight mortar are likely to occur.
The particle size of 8 mm or less is the size of particles that can pass through a sieve having an opening of 8 mm.

The lower limit of the particle diameter of the inorganic lightweight aggregate is not particularly limited, and the average particle diameter may be 0.1 mm or more (more preferably 0.5 mm or more). Thereby, it becomes easy to obtain a lightweight mortar excellent in curability. When the average particle size is too small, the specific surface area of the lightweight aggregate is increased and the aggregate is likely to absorb water, so that the amount of water added to the liquid A increases, and therefore it tends to take time to cure.
In addition, the average particle diameter here is a particle diameter that is an average particle size distribution obtained from the result of sieving using a metal mesh sieve defined in JIS Z8801-1 (2006). . That is, the particle size is such that 50% by mass of the particles exist above and below it.

  The content of the inorganic lightweight aggregate is preferably 10 to 100 parts by mass (more preferably 15 to 50 parts by mass) with respect to 100 parts of cement. If the content is within this range, a lightweight mortar having a specific gravity of 0.1 to 1.0 and excellent in heat insulation and strength can be obtained.

In addition, you may make the said A liquid contain a filler and an additive in the range which does not impair the summary of this invention as a compound other than a cement, a resin foam, an inorganic lightweight aggregate, and water. What is necessary is just to use suitably what is used for a normal mortar and a lightweight mortar as a filler and an additive.

  Examples of the filler include, for example, river sand, silica sand, cold water sand, ceramic pulverized material, glass pulverized material, inorganic particles such as calcium carbonate (not applicable to the inorganic lightweight aggregate), resin particles, and hollow resin particles Organic fibers such as rock wool, slag wool, and glass fibers, and organic fibers such as acrylic fibers, vinylon fibers, polyamide fibers, aromatic polyamide fibers, and polyester fibers can be used as appropriate.

  Examples of the additive include a synthetic resin (synthetic resin emulsion, re-emulsification type powder resin, etc.), a thickener, a water absorption inhibitor, a water repellent, a water reducing agent, a fluidizing agent, a water retention agent, and the like serving as a binder. It can be used as appropriate.

The B liquid is a fluid containing water and a quick setting agent.
The quick setting agent is mixed with the A liquid as the B liquid, thereby reacting with the cement in the A liquid, thereby eliminating the fluidity of the mixture of the B liquid and the A liquid, and the mixture of the B liquid and the A liquid. It is a substance that hardens (falsely congeals). Specifically, silicates such as sodium silicate and potassium silicate, aluminates such as sodium aluminate, potassium aluminate and calcium aluminate, sulfates such as sodium sulfate, potassium sulfate and magnesium sulfate, CaO · _{Al 2 O 3, 12CaO · 7Al} 2 O 3, CaO · 2Al 2 O 3, 3CaO · Al 2 O 3, 3CaO · 3Al 2 O 3 · CaF 2, calcium aluminate such as _{11CaO · 7Al 2 O 3 · CaF} 2 , Calcium salts such as calcium oxide, calcium hydroxide and calcium chloride, or colloidal silica are preferably used. These may be used alone or in combination of two or more. Moreover, when making these contain in B liquid, these may be added directly and these aqueous solutions etc. may be added.

  Among these quick setting agents, it is preferable to use silicate as the quick setting agent because the use of silicate can particularly quickly cure the mixture of the B liquid and the A liquid.

The mixing amount of the quick setting agent with respect to the cement is appropriately determined depending on the type of the quick setting agent. For example, when the quick setting agent is a silicate, with respect to 100 parts by weight of the cement in the liquid A, the liquid A and the solid content of the quick setting agent in the liquid B are 10 to 40 parts by weight. It is preferable to mix B liquid. If it is this mixing ratio, the mixture of B liquid and A liquid can be hardened rapidly. When there are few quick setting agents, there exists a possibility that the mixture of B liquid and A liquid may not fully harden | cure. On the contrary, when there are too many quick setting agents, the excess quick setting agent oozes out with the water from the mixture of A liquid and B liquid after construction, and the layer of quick setting agents is made on the surface of lightweight mortar. There is.
The solid content of the silicate quenching agent is the sum of the silicon dioxide content and the metal oxide content. For example, the solid content of the quick setting agent in the sodium silicate aqueous solution is obtained by multiplying the mass of the sodium silicate aqueous solution by summing the silicon dioxide content and the sodium oxide content determined according to JIS K1408. Ask.

  Moreover, you may contain an additive in the said B liquid other than the said quick setting agent as a compound.

  In addition, 20-60 mass% is preferable and, as for the solid content of the quick setting agent which occupies in B liquid, 30-50 mass% is more preferable. Thereby, the sclerosis | hardenability of the mixture of A liquid and B liquid can be improved more. When there is too little content of a quick setting agent, the sclerosis | hardenability of the mixture of A liquid and B liquid cannot fully be improved, but it will take time for hardening of a mixture. Conversely, if the content is too large, curing proceeds rapidly during mixing of the A liquid and the B liquid, and the A liquid and the B liquid may not be sufficiently mixed. Moreover, since hardening is too early, sufficient pot life until construction after mixing cannot be obtained.

  As a method of mixing the A liquid and the B liquid, there is a method in which the A liquid and the B liquid are put into the same container and stirred. Examples of the stirring method include a method using a stirrer such as a mortar mixer.

Further, it is also possible to use a method of mixing the A liquid and the B liquid by pumping the A liquid and the B liquid through separate pipes, and joining the pipe feeding the A liquid and the pipe feeding the B liquid together. . In this method, since the merged liquid A and liquid B are mixed, the liquid A and liquid B can be mixed only in a necessary amount by adjusting the amount to be pumped. Moreover, if the speed which pumps A liquid and B liquid is adjusted, a required quantity can also be mixed at any time. Furthermore, it is possible to attach a spray nozzle to the outlet of a pipe where the pipe for pumping the A liquid and the pipe for pumping the B liquid are joined, and spray the mixture of the A liquid and the B liquid. According to this method, since the mixture of A liquid and B liquid is sprayed immediately after mixing, the mixture of A liquid and B liquid can be applied in a short time after mixing. In the case of adopting this method, it is more preferable to join the pipe for pumping the A liquid and the pipe for pumping the B liquid immediately before the outlet of the pipe. Since A liquid and B liquid start hardening from the time of mixing, it is preferable to use such a method which can be applied immediately after mixing.

As what combined the pipe | tube which pumps A liquid and the pipe | tube which pumps B liquid, what is shown to Fig.1 (a) and FIG.1 (b) is mentioned, for example.

In the pipes of FIGS. 1A and 1B, the pipe 11 for pumping the liquid A and the pipe 12 for pumping the liquid B merge, and the liquid A and the liquid B are mixed in the portion of the pipe 13 after the merge. Then, the mixture of the liquid A and the liquid B is discharged from the outlet of the tube 13. Furthermore, it is possible to attach a spraying device to the outlet of the tube 13 and spray the mixture of the liquid A and the liquid B immediately after mixing.

  As a method of constructing a mixture of liquid A and liquid B on the wall or ceiling of a building, it is not limited to construction by spraying, but a method of applying using construction tools such as a roller or a hand Can be adopted.

  In addition, this construction method is not limited to direct construction on a building, but also when a heat insulating layer is formed on a base material such as a building material before being attached to a building, or when a heat insulating material made of lightweight mortar is formed. Can be used.

  In addition, the following problems can be solved and the following effects can also be acquired by using the construction method of the lightweight mortar of this invention.

Usually, when a mixture containing cement, a resin foam, an inorganic lightweight aggregate, and water is cured to obtain a lightweight mortar, shrinkage of the material during the curing process becomes a problem. That is, the shrinkage ratio [(V ₁ −V ₂ ) / V ₁ ] when the volume [V ₁ ] of the mixture before curing and the volume [V ₂ ] of the lightweight mortar in which the mixture is cured is large, and the environment during drying Since the shrinkage varies depending on (temperature, humidity, wind speed, etc.), it was difficult to construct a lightweight mortar with a predetermined thickness. Moreover, the heat insulation of the obtained lightweight mortar may be impaired by contracting.

  When a lightweight mortar is constructed by the construction method of the present invention, the shrinkage rate can be reduced by rapidly curing the lightweight mortar, and a lightweight mortar having a predetermined thickness can be easily obtained. Moreover, the light weight mortar excellent in heat insulation can be obtained by suppressing shrinkage | contraction.

A lightweight mortar was constructed using the apparatus outlined in FIG.
FIG. 2 shows an outline of an apparatus for mixing the liquid A stored in the liquid A container 21 and the liquid B stored in the liquid B container 22 and spraying the mixture onto the concrete wall surface 50.
At the time of construction, the A liquid is sent to the A liquid pressure feed pipe 11 by the A liquid pressure feed pump 31, and at the same time, the B liquid is sent to the B liquid pressure feed pipe 12 by the B liquid pressure feed pump 32. From the compressor 33, air for injecting a mixture of the liquid A and the liquid B from the spray nozzle 14 is sent to the air pipe 34.
By doing so, the pipe 34 first joins the pipe 12 so that the B liquid and the air mix, and it joins the pipe 11 to mix the A liquid and the B liquid. The mixture 23 of the liquid A and the liquid B obtained as described above is sprayed toward the wall surface 50 from the spray nozzle 14 attached to the outlet of the pipe.
At this time, by adjusting the pump 31 and the pump 32, the amount of liquid A and liquid B can be adjusted. Moreover, the pressure of the air compressed by the compressor 33 can be adjusted according to the property of the material to spray.

Construction of lightweight mortar using this apparatus was performed according to the following procedure.

Example 1
First, A liquid which mixed each material with the following compounding ratio was manufactured, and A liquid was accommodated in the A liquid container 21.
Formulation of liquid A: normal Portland cement 100 parts by mass, pearlite (particle size 0.5-3 mm, unit volume mass 0.16 kg / L) 5 parts by mass, glass foam (porous substantially spherical particles, particle size 1 2 mm, unit volume mass 0.35 kg / L, water absorption 7 mass%) 15 parts by mass, re-emulsifying acrylic resin powder 5 parts by mass, vinylon fiber 2 parts by mass, expanded polystyrene (particle diameter 3-6 mm, unit volume mass 0 .01 kg / L) 3.8 parts by mass, 120 parts by mass of water.

  Next, B liquid containing sodium silicate as a quick setting agent was manufactured. Sodium silicate 3 (solid content: 40% by mass) was used as sodium silicate, and water was added to adjust the solid content of sodium silicate to 37% by mass. Accommodated.

  Next, the pump 31 and the pump 32 are adjusted to adjust the pumping amount per unit time of the liquid A and the pumping amount per unit time of the liquid B. 30% by mass of sodium silicate (solid content) in the liquid was mixed.

Next, the pump 31, the pump 32, and the compressor 33 are operated, the A liquid and the B liquid are pumped, the A liquid and the B liquid are merged and mixed, and the mixture 23 is discharged from the spray nozzle 14. The wall surface 50 was sprayed with a thickness of about 4 cm.

The sprayed mixture 23 hardened (false condensed) in about 2 minutes after spraying. Due to the rapid hardening (false condensation) of the mixture 23, the mixture 23 sprayed onto the wall surface 50 did not show any problems such as dripping due to its own weight.
Furthermore, it was cured for 14 days in an environment of a temperature of 23 ° C. and a humidity of 60%, and the mixture 23 was dried and cured to obtain a lightweight mortar.

(Example 2)
First, A liquid which mixed each material with the following compounding ratio was manufactured, and A liquid was accommodated in the A liquid container 21.
Composition of liquid A: normal Portland cement 100 parts by mass, glass foam (porous approximately spherical particles, particle diameter of 1-2 mm, unit volume mass 0.35 kg / L, water absorption 7% by mass) 26 parts by mass, re-emulsification Type acrylic resin powder 5 parts by mass, vinylon fiber 2 parts by mass, expanded polystyrene (particle diameter 3-6 mm, unit volume mass 0.01 kg / L) 3.8 parts by mass, water 105 parts by mass.

  The B liquid is the same as in Example 1, and the pump 31 and the pump 32 are adjusted to adjust the pumping amount per unit time of the A liquid and the pumping amount per unit time of the B liquid. 25 mass% of sodium silicate (solid content) in B liquid was mixed with 100 mass parts of cement in the inside.

Next, the pump 31, the pump 32, and the compressor 33 are operated, the A liquid and the B liquid are pumped, the A liquid and the B liquid are merged and mixed, and the mixture 23 is discharged from the spray nozzle 14. The wall surface 50 was sprayed with a thickness of about 4 cm.

The sprayed mixture 23 hardened (false condensed) in about 2 minutes after spraying. Due to the rapid hardening (false condensation) of the mixture 23, the mixture 23 sprayed onto the wall surface 50 did not show any problems such as dripping due to its own weight.
Furthermore, it was cured for 14 days in an environment of a temperature of 23 ° C. and a humidity of 60%, and the mixture 23 was dried and cured to obtain a lightweight mortar.

(Comparative Example 1)
First, A liquid was accommodated in the A liquid container 21 which was the same as that used in Example 1.
Next, water was stored in the B liquid container 22.

Next, the pump 31 and the pump 32 are adjusted to adjust the pumping amount per unit time of the liquid A and the pumping amount per unit time of the water. Mass% was mixed.

And the pump 31, the pump 32, and the compressor 33 are operated, A liquid and water are pumped, A liquid and water are merged and mixed, The mixture 23 is sprayed from the spray nozzle 14 to the wall surface 50. Sprayed with a thickness of about 4 cm.

The sprayed mixture 23 does not sufficiently cure even after 6 hours, and the mixture 23 sprayed on the wall surface 50 is drooped by its own weight, and is further shifted by a few tens of centimeters downward from the wall surface 50 by its own weight. fell.
Furthermore, it was cured for 14 days in an environment of a temperature of 23 ° C. and a humidity of 60%, and the mixture 23 was dried and cured to obtain a lightweight mortar.

Sectional drawing which shows the outline of the pipe | tube which mixes A liquid and B liquid Schematic diagram showing the outline of the spraying equipment used for the construction of lightweight mortar

11 Pipe for pumping A liquid 12 Pipe for pumping B liquid 13 Pipe for feeding A liquid and pipe for pumping B liquid 14 Spray nozzle 21 A liquid container 22 B liquid container 23 A liquid Mixture 31 and B liquid 31 A liquid pump 32 B liquid pump 33 Compressor 34 Air pipe 50 Wall surface

Claims (5)

100 parts by mass of cement, 1 to 20 parts by mass of a resin foam having a unit volume mass of 0.1 kg / L or less, 10 to 100 parts by mass of an inorganic lightweight aggregate having a unit volume mass of 0.6 kg / L or less, and a rapid setting agent Is a method for constructing a lightweight mortar containing cement, a resin foam, an inorganic lightweight aggregate, and a liquid A containing water and a liquid B containing a quick setting agent before construction. A lightweight mortar construction method.   The construction method of the lightweight mortar of Claim 1 whose 60-100 mass% in the whole quantity of the said inorganic lightweight aggregate is an inorganic lightweight aggregate with a water absorption of 10 mass% or less.   The construction method of the lightweight mortar of Claim 1 or 2 whose solid content of the quick setting agent which occupies in the said B liquid is 20-60 mass%. The quick setting agent is a silicate, and the liquid A and the liquid B so that the solid content of the quick setting agent in the liquid B is 10 to 40 parts by mass with respect to 100 parts by mass of the cement in the liquid A. The construction method of the lightweight mortar in any one of Claims 1-3 characterized by the above-mentioned. 100 parts by mass of cement, 1 to 20 parts by mass of a resin foam having a unit volume mass of 0.1 kg / L or less, 10 to 100 parts by mass of an inorganic lightweight aggregate having a unit volume mass of 0.6 kg / L or less, and a rapid setting agent And light weight mortar obtained by curing a mixture containing water.

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