JP2007205011A - Construction method and coating method for soil-based pavement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize both the prevention of the appearance of a crack, and that of a deterioration in designability, caused by efflorescence, and the production of dust etc., in a soil-based pavement. <P>SOLUTION: In this construction method for the soil-based pavement, after the preparation of a mixture for the soil-based pavement, in which soil, and cement and/or hydrated lime are mixed together, water is mixed into the mixture for the soil-based pavement, so that a pavement material can be prepared; and the pavement material is placed and spread in a paving place, subjected to surface compaction, and cured for the soil-based pavement. When the soil for use contains 2-30 mass% particles with a particle diameter of 75 μm or less and the mixture for the soil-based pavement contains a surfactant-based shrinkage reducing agent 1a, the construction method comprises a coating step of forming a surface layer 2, which is composed of an acrylic silicon-based, urethane-based or epoxy silicon-based coating agent, on the soil-based pavement 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for constructing an earth-based pavement and a method for coating the earth-based pavement.

  Conventionally, the applicant has proposed the room temperature solidified inorganic material preparations of Patent Documents 1-10. Patent Documents 11 to 13 disclose other preparations. These formulations contain calcium, such as soil and cement, slaked lime.

  These formulations can be ground pavement after being mixed with water and then laid down on the pavement, rolled and cured. This earth-based pavement retains the natural soil atmosphere and exhibits an excellent design.

JP 2000-1347 A JP 2000-1358 A JP 2001-31462 A JP 2000-290058 A JP 2000-203922 A JP 2001-114579 A JP 2001-271306 A JP 2002-87872 A JP 2001-192256 A JP 2004-52536 A Japanese Patent Laid-Open No. 11-302643 Japanese Patent Laid-Open No. 10-1908 JP-A-11-71582

  However, since the conventional earth-based pavement often contains fine particles in the soil, cracks are likely to occur due to shrinkage. Generally, in order to prevent the occurrence of such cracks, it is effective to include a surfactant-based shrinkage reducing agent in the preparation, and thus in the soil-based pavement.

  In addition, when this soil-based pavement is constructed outdoors, unreacted calcium is eluted on the surface by rainwater and when it is constructed indoors by water used for cleaning, etc. It may occur and the designability may deteriorate. In addition, this earth-based pavement is likely to be worn due to insufficient surface hardness, and there is a concern about generation of dust and the like. Generally, in order to prevent these problems, it is effective to form a surface layer made of a resin-based coating agent on earth-based pavement.

  However, in order to solve both of the above problems, if a surface layer made of a resin-based coating agent is formed on a soil-based pavement while a surfactant-based shrinkage reducing agent is included in the preparation, the surface layer is cured. It became clear that it would cause defects.

  The present invention has been made in view of the above-described conventional situation, and realizes both prevention of generation of cracks, reduction of designability by white flower and prevention of generation of dust and the like in earth-based pavement. Is a problem to be solved.

  The inventors have intensively studied to solve the above-mentioned problems, and the surface layer is poorly cured by a surfactant-based shrinkage reducing agent. The particle size of the soil used for soil-based paving, its water permeability, and the resin of the surface layer. The present invention has been completed by discovering that it is based on the kind of the above.

  The construction method of the earth-based pavement of the first invention based on this discovery is a preparation step of preparing a composition for earth-based pavement in which soil and cement and / or slaked lime are mixed,

  Construction of earth-based pavement comprising a pavement process in which water is mixed with the composition for earth-based pavement to form a pavement material, and the pavement material is laid on a pavement place and rolled and cured to form a soil-type pavement. In the method

  When the soil has a particle size of 2 to 30% by mass with a particle size of 75 μm or less, and the soil-based paving preparation contains a surfactant-based shrinkage reducing agent, an acrylic silicon-based or urethane-based material is formed on the soil-based paving. Alternatively, a coating process for forming a surface layer made of an epoxy silicon-based coating agent is performed.

  Soil generally consists of gravel, sand, silt and clay. The gravel has a particle size exceeding 2000 μm. The sand composed of fine sand, medium sand and coarse sand has a particle size of more than 74 μm and not more than 2000 μm. The silt component has a particle size of more than 5 μm and 75 μm or less. The clay (including colloid) has a particle size of 5 μm or less. Sand is used for concrete, but silt and clay are not used. The soil according to the present invention contains 2 to 30% by mass of silt or less, that is, particles having a particle size of 75 μm or less. For this reason, the soil-based pavement retains the natural soil atmosphere as it is and exhibits an excellent design, while being prone to cracking and having water permeability.

  If a surfactant-based shrinkage reducing agent is included in the soil-based pavement to prevent cracks, the water moves to the surface side due to the water permeability of the soil-based pavement, and the surface of this water is moved to the surface side. The shrinkage reducing agent also moves to the surface as it moves, and is concentrated. For this reason, if a surface layer made of a resin-based coating agent is formed on the soil-based pavement as a coating step, the concentrated shrinkage reducing agent comes into contact with the surface layer, and when the resin is a specific one, The surface layer is prevented from curing.

  In this regard, in the construction method of the first invention, the resin of the surface layer formed by the coating process on the earth-based pavement is an acrylic silicon type, a urethane type or an epoxy silicon type. According to the test results of the inventors, if the surface layer is made of these resins, the surface layer suitably maintains the hardness even if the concentrated shrinkage reducing agent comes into contact with the surface layer.

  In addition, the method for coating a soil-based pavement of the second invention based on the same discovery is a pavement material in which water is mixed with a soil-based pavement composition in which soil and cement and / or slaked lime are mixed. A method for coating an earth-based pavement in which the pavement material is laid on a pavement, formed by rolling and curing,

  When the soil has a particle size of 2 to 30% by mass with a particle size of 75 μm or less, and the soil-based paving preparation contains a surfactant-based shrinkage reducing agent, an acrylic silicon-based or urethane-based material is formed on the soil-based paving. Alternatively, a coating process for forming a surface layer made of an epoxy silicon-based coating agent is performed.

  Also in the coating method of the second invention, since the resin of the surface layer formed by the coating process on the earth-based pavement is an acrylic silicon type, a urethane type or an epoxy silicon type, the concentrated shrinkage reducing agent is in contact with the surface layer. Even so, the surface layer preferably maintains hardness.

  Therefore, if it is the construction method of the first invention or the coating method of the second invention, it is possible to realize both prevention of generation of cracks in earth-based pavement, reduction of design by white flower and prevention of generation of dust and the like. Can do.

  Japanese Patent No. 2816854 discloses that a surface layer made of a polyurethane resin coating agent is formed on a base layer made of a granular elastic material and having a high porosity. However, this technology does not solve the problems peculiar to earth paving.

  In the construction method of the first invention or the coating method of the second invention, the coating agent is preferably a water-based acrylic silicon-based one. According to the test results of the inventors, the acrylic silicon-based coating agent exhibits the most excellent effect. And if it is an aqueous thing, it is excellent also in workability | operativity.

  In the construction method of the first invention or the coating method of the second invention, the coating agent is preferably an organic solvent-based one. In the case of an organic solvent-based coating agent, an excellent effect is exhibited in an acrylic silicon system, a urethane system, or an epoxy silicon system.

  The soil-based paving preparation can also contain pigments and aggregates. As the aggregate, in addition to gravel and crushed stone, inorganic waste such as concrete, ceramics, cullet and the like can also be used.

  Examples 1 to 3 that embody the first invention and Example 4 that embody the second invention will be described below with reference to the drawings.

  Each material was prepared with the composition shown in Table 1, and other materials except water were mixed with a mixer to obtain a soil-based paving formulation.

  The soil consists of 59.74 parts by mass of sand and 40.26 parts by mass of crushed stone waste. As shown in FIG. 1, the particle size distribution of the soil includes 1.32% by mass of particles having a particle size of 75 μm or less, and the crushed stone waste soil has 7.23% by mass of particles having a particle size of 75 μm or less. % Is included. The soil obtained by mixing sand and crushed stone waste with the composition shown in Table 1 has a maximum particle size of 10 mm or less, and 3.7% by mass of particles having a particle size of 75 μm or less (breakdown: 0.8% by mass of sand) The crushed stone waste soil is 2.9% by mass). The cement is usually Portland cement. The aggregate consists of 4.05 parts by mass of No. 6 crushed stone having a particle size of 5 to 13 mm and 15.44 parts by mass of No. 7 crushed stone having a particle size of 2.5 to 5 mm. The shrinkage reducing agent is a polyether surfactant (“Hibidan B” manufactured by Takemoto Yushi Co., Ltd.). The admixture is an AE agent and an antifoaming agent.

  Water of the composition shown in Table 1 was added to this soil-based paving preparation, and these were mixed by a mixer to obtain a paving material. Spread this pavement material at a thickness of 7.5 to 8 cm on the pavement where the formwork is installed, roll it with a hand guide roller to a thickness of 5 cm, and then cover it with a blue vinyl sheet. For 7 days. In addition, the rolling by manual work was also performed as needed. Thus, the earth-based pavement 1 shown in FIG. 2 was obtained. The earth-based pavement 1 contains a surfactant-based shrinkage reducing agent 1a.

  Next, a coating agent was prepared. The coating agent is No. 2 shown in Table 2. No. 4 stock solution (acrylic silicon type) is used.

This coating agent was applied onto the earth-based pavement 1 at a coating amount of 100 to 200 g / m ² and dried to form the surface layer 2.

  A surface layer 2 was formed on the earth-based pavement 1 in the same manner as in Example 1 by using the coating agent shown in Table 3. Other conditions are the same as in the first embodiment.

  A surface layer 2 was formed on the earth-based pavement 1 in the same manner as in Example 1 by using the coating agent shown in Table 4. Other conditions are the same as in the first embodiment.

  In Example 4, the coating agent of Example 1 was applied on the soil-based pavement 1 that had already been constructed, and the surface layer 2 was formed on the soil-based pavement 1. Other conditions are the same as in the first embodiment. It is also possible to form the surface layer 2 using the coating agents of Examples 2 and 3.

(Evaluation 1)
The effects of shrinkage reducing agents were evaluated on stock solutions of various coating agents. Table 2 shows the components and solvents of the coating agent used in the evaluation. The shrinkage reducing agent is a polyether surfactant (“Hibidan B” manufactured by Takemoto Yushi Co., Ltd.).

  Film formation test A is a film formed on a glass plate only with a stock solution of a coating agent, and its properties are observed. No. The reason for the evaluation of the two or three coating agent stock solutions was Δ was that the strength of the obtained film was insufficient. No. The reason why the coating solution of No. 7 was evaluated as Δ was that the obtained film was slightly sticky.

  In the film-forming test B, an undiluted coating agent solution and a shrinkage reducing agent were mixed at a mass ratio of 10: 1, a film was formed on a glass plate with this mixture, and the properties thereof were observed. No. The reason why the evaluation of the mixture of 1 to 4 and 7 was Δ was that the obtained film was sticky.

  In the film-forming test C, a stock solution of a coating agent and a shrinkage reducing agent were mixed at a mass ratio of 10: 8, a film was formed on the glass plate with this mixture, and the properties thereof were observed. Evaluation x shows that it did not harden | cure. No. The reason why the evaluation was Δ in the mixture of 9 to 11, 15, 16, 17, 19, 21 to 23 was that the obtained film was sticky. No. The reason why the evaluation was Δ in the mixture of 14 and 18 was that the film was hardened but soft.

  As shown in Table 2, the shrinkage reducing agent was hung from the surface after 1 day after film formation using each coating agent, and the resistance test was also performed. Evaluation x indicates that the film was softened and liquefied. No. The reason why the evaluation was “good” in 4, 6, 8, 9, 11-14, 18, 20, and 21 was that the film was scratched with a nail and had sufficient hardness. No. The evaluation at 16 was Δ because the film was softened.

  As a result, no. It turns out that it is preferable to use the coating agent of 4, 6, 9, 11-14, 16, 17, 18-21, ie, an acrylic silicon type, urethane type, or an epoxy silicon type coating agent. For this reason, as shown in FIG. 2, if the surface layer 2 is formed with these coating agents, even if the concentrated shrinkage reducing agent 1a comes into contact with the surface layer 2 due to the water permeability of the earth-based pavement, the surface layer 2 suitably maintains the hardness.

  In particular, no. Since the coating agents 4 and 6 are water-based acrylic silicon-based, they exhibit excellent workability and are preferable. This is because the earth-based pavement obtained in Examples 1 and 2 is constructed under excellent workability, is less likely to generate cracks, and can also exhibit the effect of reducing design by white flower and preventing the generation of dust, etc. It is a proof of.

  No. Since the coating agents of Nos. 9, 11 to 14, 16, 17, and 18 to 21 are based on an organic solvent, it can be seen that an excellent effect is exhibited in an acrylic silicon type, a urethane type, or an epoxy silicon type.

  In the above, the present invention has been described with reference to the first to fourth embodiments. However, the present invention is not limited to the first to fourth embodiments, and can be appropriately modified and applied without departing from the spirit of the present invention. Needless to say.

  The first and second inventions can be used for pavements, floors and the like.

It is a graph which shows the particle size distribution of the sand used in Example 1, 2 and crushed stone waste soil. It is a schematic cross section of the earth-based pavement and the surface layer of Examples 1 and 2. It is a schematic cross section of the earth-based pavement and the surface layer of Examples 1 and 2.

Claims (6)

A preparation step for preparing a soil-based pavement composition in which soil and cement and / or slaked lime are mixed;
Construction of earth-based pavement comprising mixing the water for the earth-based pavement composition into a pavement material, laying the pavement material on the pavement site, and rolling and curing to make the earth-based pavement. In the method
In the case where the soil has a particle size of 2 to 30% by mass with a particle size of 75 μm or less, and the soil-based paving preparation contains a surfactant-based shrinkage reducing agent, an acrylic silicon-based or urethane-based material is formed on the soil-based paving. Or the construction method of the earth-based pavement characterized by performing the coating process which forms the surface layer which consists of an epoxy silicon type coating agent.   The method for constructing a soil-based pavement according to claim 1, wherein the coating agent is a water-based acrylic silicon-based one.   The method for constructing an earth-based pavement according to claim 1, wherein the coating agent is an organic solvent-based one. Water is mixed with an earth-based paving composition in which soil and cement and / or slaked lime are mixed to form a paving material, and the paving material is laid on the paving site, and is formed by rolling and curing. A method for coating a soil-based pavement,
In the case where the soil has a particle size of 2 to 30% by mass with a particle size of 75 μm or less, and the soil-based paving preparation contains a surfactant-based shrinkage reducing agent, an acrylic silicon-based or urethane-based material is formed on the soil-based paving. Or the coating method to the earth-type pavement characterized by performing the coating process which forms the surface layer which consists of an epoxy silicon type coating agent.   The method for coating a soil-based pavement according to claim 4, wherein the coating agent is a water-based acrylic silicon-based one.   The method for coating a soil-based pavement according to claim 1, wherein the coating agent is based on an organic solvent.

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