JP2001348806A - Pavement material and pavement execution method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote the hardening speed, and to shorten work time in a pavement material for joining and hardening an aggregate by a hardenable binder resin. SOLUTION: In this pavement material by blending the aggregate and a hardenable resin binder, this pavement execution method is constituted by integrally hardening a blend in the presence of water by blending a hydration heat generating substance with either or both of the pavement material by including the hydration heat generating substance in the pavement material, the aggregate and the hardenable resin binder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pavement material having an aggregate and a resin binder and having an improved curing speed, and a pavement construction method using the pavement material.

[0002]

2. Description of the Related Art In recent years, pavement materials and flooring materials which use silica sand, rubber chips, crushed stones, cobblestones, ceramic grains, or the like as an aggregate and harden and bond them using the curability of a resin binder such as an epoxy resin or a urethane resin have been developed. It is widely used. For example, a pavement material using a one-component curable urethane resin has a complicated curing process due to the reaction with moisture, and thus does not require a complicated process such as compounding while taking care of the ratio with the curing material, without the need for preparation. It can exhibit stable pavement performance and is widely used in manufacturing sites and construction sites.

[0003] This curing mechanism is characterized in that after a pavement material containing a resin binder is blended into a desired composition, it is cured mainly by a reaction with moisture in the air or moisture forcibly added. The supply of moisture is performed through the voids since the mixture of the resin binder and the aggregate has some voids therebetween.

[0004]

Since the curing by the above mechanism is a chemical reaction, the reaction rate is lower at low temperatures than at normal temperatures or higher, and the moisture in the air is small ( In other words, the curing reaction often requires time due to low humidity. In particular, in the case of an in-situ coating application type material that cures by supplying moisture from a natural atmosphere due to the moisture in the air, the curing delay at low temperatures becomes significant.
In the case of the in-situ coating method, in order to compensate for the supply of moisture from the air, water may be forcibly supplied at the time when the initial curing has progressed to such an extent that the desired shape is not lost. Although such a supply of water increases the supply amount of the reaction component, the effect of promoting the curing reaction is not sufficient because thermal energy itself is not supplied.

In the winter season, the curing reaction is often delayed for several days, resulting in poor workability. In particular, in the construction process and the manufacturing process that involve the next process, there is no waiting time, which is inefficient and costly. Also disadvantageous. Therefore, an object of the present invention is to provide a pavement material in which the curing speed is accelerated and a pavement construction method in a pavement material in which an aggregate is hardened and bound by a binder resin.

[0006]

Means for Solving the Problems and Effects of the Invention In order to solve the above-mentioned problems, the present inventors have conducted various studies centering on the search for an effective substance for accelerating the curing speed. It is completed. That is, the present invention provides: 1) a pavement material comprising an aggregate and a curable resin binder, wherein the pavement material contains a hydration heat-generating substance; The pavement material according to the above item 1), wherein the hydration heat-generating substance is preliminarily blended with an aggregate and / or a curable resin binder. The pavement material according to the above 1), which is selected from the group consisting of oxides or chlorides of similar metals; 4) the curable resin binder is a one-part moisture-curable urethane resin or an epoxy resin. The pavement material according to the above item 1), 5) the pavement material according to the above item 1), wherein the aggregate is mainly composed of a rubber chip, and 6) bonding with a curable resin binder. Hardening pavement In, blended hydrated thermogenic material to either or both of the curable resin binder and aggregate, a pavement construction method, characterized in that curing integrated in the presence of moisture.

According to the present invention, since the hydration heat-generating substance is added to the pavement material using the curable resin binder, the thermal energy generated by the reaction or hydration between the hydration heat-generating substance and water. This accelerates the curing speed of the resin binder. For this reason, the curing period until the curable resin binder reacts with the moisture in the air to exhibit a certain level of strength (for example, the strength at which it can be walked) can be significantly reduced as compared with the conventional pavement material. . Conventionally,
Since the curing period is long, workability is poor and pavement construction requires a long time, and workability improvement has been a concern especially at low temperatures such as winter, but according to the present invention, time for pavement construction is Is greatly reduced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The aggregate in the present invention is only required to be a conventional pavement material, and there is no particular limitation on its type and shape. For example, silica sand, rubber chips, crushed stone, gravel, ceramic grain sand, calcined bauxite, emery, nickel slag, glass aggregate, etc.
Seeds or a mixture of two or more kinds is used. Examples of the rubber chip include a granular rubber and a shiny rubber having a diameter of about 5 mmφ or less.

Next, the curable resin binder may be any resin whose curing is accelerated by heat, and is mainly a conventional resin for pavement materials, especially a one-part moisture-curable urethane resin or an epoxy resin. The one-part moisture-curable urethane resin is a polyurethane prepolymer having a terminal isocyanate group, and is a reaction product of a polyisocyanate compound and a polyol. One-part moisture-curable urethane resin has the property of curing and polymerizing while the isocyanate group part forms a urethane bond in the presence of water, and paving materials using this resin are hardening systems that require the supply of moisture. It is a pavement material that can easily utilize the thermal energy generated by the reaction or hydration of the moisture with the hydration heat generating substance.

Examples of the isocyanate compound used as a raw material of the urethane prepolymer include modified MDI such as tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymeric MDI, liquid MDI, hydrogenated TDI, hydrogenated MDI, and hexamethylene. Examples include diisocyanate (HMDI), xylylene diisocyanate (XDI), naphthalene diisocyanate (NDI), triphenylmethane triisocyanate, and polymethylene polyphenyl isocyanate. Among these, MDI and TDI can be preferably used. Also, a mixture of these can be used.

As the polyurethane prepolymer, those synthesized by a conventional method are used. For example, the equivalent ratio of the isocyanate group (NCO) contained in the isocyanate compound to the hydroxyl group (OH) contained in the polyol (NCO /
(OH) is NCO / OH = 1.3 to 10 and the above two components are blended and reacted at about 50 to 120 ° C. for about 3 to 10 hours. In this reaction, conventionally known catalysts and solvents can be used,
Various additives such as a stabilizer and a plasticizer may be added according to a known method.

The polyol is not particularly limited as long as it has two or more active hydrogen groups and is capable of producing a terminal isocyanate group type polyurethane prepolymer by reacting with an isocyanate compound. Conventionally known compounds having an average number of functional groups (the number of active hydrogen groups) of 50 to 6,000 and 2 to 4 are exemplified.
For example, low molecular weight dihydric or trihydric alcohols, polyether polyols, condensed polyester polyols, polymerized polyester polyols, polycaptolactone polyols and the like can be used.

Particularly preferred polyols include, for example, ethylene glycol, propylene glycol, 1,3
-Butanediol, 1,4-butanediol, 1,6-
Low molecular weight dihydric or trihydric alcohols such as hexane glycol, glycerin, trimethylolpropane, neopentyl glycol, poly (oxypropylene) glycol, poly (oxypropylene) triol, poly (oxypropylene) tetraol, poly ( (Oxypropylene) poly (oxyethylene) glycol, poly (oxypropylene) poly (oxyethylene) triol,
And polyalkylene ether polyols such as poly (oxytetramethylene) glycol. These can be used alone or in combination of two or more.

In the present invention, TDI / MDI modified with poly (oxytetramethylene) glycol is particularly preferably used. Among the above, the average molecular weight of the polyalkylene ether polyols and polytetramethylene ether glycols is preferably about 200 to 8000 which exhibits a low-viscosity liquid at ordinary temperature, and particularly preferably about 300 to 6000. Those having these molecular weights are advantageous in terms of workability and physical properties when used for painting floors and the like.

The isocyanate group content in the polyurethane prepolymer is usually about 1 to 15% by weight,
In the present invention, particularly, about 9 to 13% by weight is suitably used. The liquid viscosity of the polyurethane prepolymer is 1000 to 20000 cps at 25 ° C.
When the viscosity does not reach 1000 cps, the polyurethane resin drips during pavement work, and when the viscosity exceeds 20,000 cps, the workability deteriorates. In this reaction, a conventionally known catalyst and solvent can be used, and various additives such as a stabilizer and a plasticizer may be added according to a known method.

The epoxy resin is JIS K 723.
1 (1986), "a compound having an epoxy group in the molecule and capable of being cured by the action of another compound". As a pavement material, an epoxy resin having excellent adhesive properties is used, and as its application, a color pavement, a non-slip pavement, a steel floor slab pavement of a bridge, and the like are mentioned. As a specific example of the epoxy resin for paving in the present invention, a main agent mainly composed of a liquid type epoxy resin having an epoxy equivalent of about 180,
A mixture obtained by mixing and stirring an equivalent amount of a curing agent mainly composed of a modified amine obtained by adducting an epoxy resin with meta-xylylenediamine (MXDA) is used. The epoxy resin has properties after curing, for example, at around 25 ° C., a tensile strength of 30 Mpa or more, an elongation at break of 6% or less, and a compression strength of 5% or less.
Those having 0 MPa or more are preferable.

Next, as the heat-of-hydration generating substance in the present invention, a substance that generates heat by reaction with water or hydration and does not significantly impair the function of the pavement material such as an aggregate and a curable resin binder is selected. . When selecting the hydration heat-generating substance specifically, it is determined in consideration of the type of the aggregate and the curable resin binder.For example, in the case of a curable urethane resin, a substance whose hydrate does not become a strong alkali is selected. Is preferred. Examples of the heat of hydration generating material include oxides or chlorides of metals or alkaline earth metals,
More preferable specific examples include calcium oxide (quick lime), aluminum oxide, magnesium oxide, calcium chloride, magnesium chloride and silica gel in view of economy. Usually, the heat of hydration generating substance is preferably added as a powder.

In the pavement material of the present invention, the ratio between the curable resin binder and the aggregate is generally set to (curable resin binder) in consideration of securing a space capable of supplying moisture in the mixture. / (Aggregate) = 1/1 (volume ratio) is the maximum value. When the volume ratio exceeds 1/1, the inside of the layer is filled with the resin and the porosity is reduced, so that the supply of moisture is not sufficiently performed. On the other hand, the minimum value of the volume ratio is about 1/10,
When the volume ratio is not reached, the curable resin binder cannot perform its binding function. Practically, (curable resin binder) / (aggregate) = 1 / 1.5 to 1/8 (volume ratio) is a preferable compounding ratio.

The amount of the hydration heat-generating substance is preferable, since the larger the amount, the higher the amount of heat energy generated.
Actually, it is appropriately determined in consideration of the type and amount relationship between the curable resin binder and the aggregate to be used, the temperature at the time of pavement, the amount of water and the supply state thereof, and the like. In consideration of these, generally, the volume ratio of the heat-of-hydration product to the curable resin binder may be appropriately selected from the range of about 1 to 100%. It is necessary that the hydration heat-generating substance be blended as uniformly as possible throughout the pavement material during pavement construction using the aggregate and the curable resin binder. The method of blending is not particularly limited, but usually, if blended in advance with one or both of the aggregate and the curable resin binder, more uniform blending can be achieved with good workability.

The pavement material of the present invention contains a plasticizer, a diluent, a filler, a coloring agent, a catalyst, a curing accelerator, an aging agent, in addition to the above-mentioned aggregate, curable resin binder and hydrating thermogenic substance. Various additives such as an inhibitor may be appropriately compounded according to the purpose of paving at that time. As the plasticizer, any of conventionally known plasticizers such as dioctyl phthalate (DOP), dibutyl phthalate (DBP), dioctyl adipate (DOA), tricresyl phosphate, and chlorinated paraffin can be used. is there.

As the diluent, conventionally known ones such as common organic solvents such as toluene, xylene and ethyl acetate, and high-boiling solvents such as alkylbenzene, liquid paraffin and mineral spirit can be used. As the filler, for example, calcium carbonate, barium carbonate, barium sulfate,
Various artificial or natural fillers such as talc, anhydrous gypsum, magnesium carbonate, mica, zinc white, kaolin, zeolite, and diatomaceous earth can be used.

As the colorant, a part of the above fillers can be used as an extender, and in addition, chromium oxide, titanium oxide, graphite, iron oxide, red iron oxide, carbon black, iron black, insoluble azo pigment, phthalocyanine pigment Are used. Incorporation into the curing agent becomes easier if the toner is made of the same material as DOP, polypropylene glycol or a binder or a part of the material. In addition to the above additives, an antifoaming agent, a leveling agent, a thickener, a dispersant, an anti-separation agent, an anti-settling agent or a stabilizer may be added as necessary.

The pavement material of the present invention is used for paving a painted floor, a pavement or an athletic stadium. The construction is
In the compounding system of the aggregate and the curable resin binder, the heat energy generated by the reaction and hydration of the hydration heat-generating substance with water is used to accelerate the curing of the curable resin binder. The water to be supplied at this time may be a natural supply by moisture in the air, but the curing reaction can be further promoted by watering or forcibly supplying hot water, steam, or the like. This forced supply can be particularly effective when accelerating hardening at the time of construction in a low temperature condition such as winter.

However, as the curable binder resin,
When using a radical polymerization type resin utilizing a peroxide such as an unsaturated polyester resin or an MMA resin,
In the case of other reactive resin binders whose curing is inhibited by excess moisture, it is better to avoid the forced supply of moisture and to supply it naturally. In addition, when the temperature is extremely low, the forcibly supplied moisture may freeze inside and adversely affect the physical properties of the pavement material. Therefore, in such a situation, it is better to supply naturally.

In the pavement construction according to the present invention, a specific procedure is described, for example, as follows. A hydration heat generating substance is blended with the curable resin binder. Here, a suitable catalyst may be added. A resin binder for the prepared aggregate is mixed and stirred. Here, a pretreatment agent such as a polyol may be added to the aggregate before adding the resin binder. The obtained agitated material is immediately spread on the application surface and uniformly spread.

When water is sprinkled after paving, the pavement surface expanded as described above is set to a time when the resin used is hardened to the extent that there is no danger of the resin flowing out by water.
Sprinkle water. The watering method may be any watering such as a mist or a shower, using a pump or a jar, as appropriate. However, the watering is performed softly so that the resin binder does not flow out and is deformed. Although the amount of watering varies depending on the pavement condition, for example, several grams to several hundreds per square meter are used.
A gram of water is a guide and may be 1 kg per square meter depending on the thickness of the pavement.
At the time of water spraying, it is preferable to avoid making the resin binder excessively water so that the resin binder is immersed in water, since this may affect pavement properties such as strength.

[0027]

The present invention will be described more specifically with reference to examples of the present invention together with comparative examples. [Materials] Epoxy resin: A non-solvent liquid epoxy resin (C / H-312) manufactured by Sumitomo Rubber Co., Ltd. was used. One-component moisture-curable urethane resin: Urethane prepolymer C-923B manufactured by Sumitomo Rubber Co., Ltd. was used. Hydration heat generating substance: Quick lime (powder) was used and was previously blended with the resin binder. -Silica sand: Silica sand No. 5 (density ρ; about 2.5) was used. -Bean gravel: used was one having a density ρ of about 2.5. Rubber tip: A rubber tip whose main component is EPDM and whose density ρ is about 1.2 is used.

[Measurement of maximum heat generation temperature]
A 300 mL measuring cup was filled with 300 mL, and a thermocouple was inserted thereinto for measurement. [Measurement of walking strength developing time] Substrate (30 cm × 3
(0 cm) was applied with the compounding material, and the object pressed with a gold trowel was used as a test object, and the time required until a person did not get any noticeable deformation such as a dent when riding on the test object was measured.

In the following description of the intensity onset time, the intensity onset time of walking in the comparative example group in each test group was set to 100, and the intensity onset time in each example group was expressed as a relative time to this. Comparative Example 1 and Examples 1 to 3 and Comparative Example 2 and Example 3 Using an epoxy resin as a curable resin binder, Table 1
An epoxy resin mortar was prepared under the conditions shown in Table 1 and the water supply conditions. At this time, the maximum exothermic temperature and walking strength developing time were measured and are shown in Table 1.

[0030]

[Table 1]

As shown in Table 1, in the epoxy resin / silica sand system, Example 1 in which quicklime was added had a higher maximum exothermic temperature than Comparative Example 1 in which quicklime was not added, and as a result, walking was possible. The time required for developing the strength is shortened. Compared to the first embodiment, the second embodiment forced watering (2
3 ° C.), the maximum exothermic temperature is further increased, and the walking strength developing time is further reduced.
Comparative Example 2 was also applied to a system of epoxy resin and pea gravel.
As is clear from the comparison between Example 3 and Example 3, by adding quick lime and forcibly watering, the time required for the strength to be able to walk is significantly reduced.

Comparative Example 3 and Examples 4 and 5 and Comparative Examples 4 and 6 Using a one-part moisture-curable urethane resin as a curable resin binder and a rubber chip as an aggregate, the composition and water content shown in Table 2 were used. A urethane resin mortar was produced under the supply conditions (23 ° C.) of the above. At this time, the maximum exothermic temperature and walking strength developing time were measured and are shown in Table 2.

[0033]

[Table 2]

From the results, it can be seen that by adding quicklime, the walking time can be reduced to about 80% (Example 4), but drastically reduced by watering (Example 5). This watering effect is shown in Comparative Example 4 and Example 5
As can be seen from the comparison, the effect is exhibited even when the amount of rubber chips is increased. Comparative Examples 5 and Examples and 8 Using a one-part moisture-curable urethane resin as a curable resin binder and a rubber chip as an aggregate, each composition shown in Table 3 and urethane under conditions of curing and water supply (5 ° C.) A resin mortar was prepared. At this time, the maximum exothermic temperature and walking strength developing time were measured and are shown in Table 3.

[0035]

[Table 3]

From these results, it was found that the addition of quick lime even at a low temperature of 5 ° C. reduced the walking strength developing time (Example 7), and the strength developing time was further reduced by 6 minutes by spraying water. This can be greatly reduced to about 1 (Eighth Embodiment).

Continuation of the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) C08L 63/00 C08L 63/00 C 75/04 75/04 101/00 101/00 F term (reference) 2D051 AF11 AG03 AG13 AG14 EB03 4J002 AC141 CD002 CK022 DA066 DD067 DE077 DE087 DE147 DJ017 GL00

Claims (6)

[Claims] 1. A pavement material comprising an aggregate and a curable resin binder, wherein the pavement material contains a hydration heat generating substance. 2. The pavement material according to claim 1, wherein said heat-generating substance for hydration is previously blended with an aggregate and / or a curable resin binder. 3. The pavement material according to claim 1, wherein said hydration thermogenic substance is selected from the group consisting of oxides or chlorides of metals or alkaline earth metals. 4. The pavement material according to claim 1, wherein said curable resin binder is one-part moisture-curable urethane resin or epoxy resin. 5. The pavement material according to claim 1, wherein said aggregate is mainly composed of rubber chips. 6. A pavement method for bonding and curing with a curable resin binder, wherein a hydrated thermogenic substance is blended with one or both of the aggregate and the curable resin binder, and cured and integrated in the presence of moisture. Characteristic pavement construction method.