JPH0226025B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a pavement structure made of a synthetic pavement body that further improves the characteristics of semi-rigid pavement. [Prior Art] Semi-rigid pavements are known in which the hollow parts of bituminous pavements are infiltrated with cement milk or cement paste containing a resin. A feature of this semi-rigid pavement is that it has a combination of flexibility and rigidity. Moreover, compared to general asphalt concrete pavement,
It has excellent oil resistance, water resistance, and flow resistance, and has the advantage that it does not require joints during construction and does not require many days of curing compared to cement concrete pavement. Therefore, this semi-rigid pavement is becoming popular not only for general road pavement but also for a wide range of applications such as factory yard pavement and sports facility floor pavement. [Problems to be Solved by the Invention] However, among the yards within a factory, there are yards that handle chemicals, such as chemical factories, and there are also yards that perform heat treatment work, such as metal factories. There are also yards that handle heavy oil, such as factories that manufacture construction machinery and machine tools. Therefore, when paving, it is preferable to perform pavement with functionality that corresponds to the work content of each factory. For example, when paving a chemical factory yard, the pavement must have a high degree of chemical resistance, or when a yard mainly performs heat treatment,
It was said that the pavement should have excellent heat resistance. In other words, it is preferable that the pavement has functionality suitable for the purpose of use of the road surface or floor surface to be paved. More preferably, it also needs to be excellent in workability and economy. This invention is applicable to road surfaces to be paved,
The objective is to provide pavement made of synthetic pavement that has various properties such as flexibility and rigidity, as well as chemical resistance, water resistance, and heat resistance, in accordance with the intended use of the floor surface. . In particular, the present invention aims to further improve the characteristics of conventional semi-rigid pavement, and aims to provide a pavement consisting of a composite pavement with a two-layer structure and multiple functions. [Means for Solving the Problems] As a means for achieving the above object, the present invention first provides a basic structure of a synthetic pavement, in which a water reducing agent and cement are added to the lower part of a bituminous pavement having a part. It is filled with a mixture of paste and styrene-butadiene rubber, and the upper space is filled with cement mortar, creating a composite pavement with a two-layer structure, upper and lower. Furthermore, in order to create a first embodiment of this two-layer synthetic pavement, that is, a synthetic pavement suitable for the intended use of the road or floor surface to be paved, steel is added to the cement mortar filled in the upper space. Granular material is added and filled to form a synthetic pavement with high compressive strength and excellent impact resistance, and in a second embodiment, styrene-butadiene rubber and other materials are added to the cement mortar that is also filled in the upper space. The purpose of this invention is to construct a synthetic pavement body with elasticity by filling it with mortar containing rubber chips or plastics containing epoxy resin or urethane resin. [Operation] As described above, the present invention uses a bituminous mixture having a void as a base, and first, in the lower void of this base,
It is filled with a mixture of cement paste containing a water reducing agent and styrene-butadiene rubber, and then the upper space is filled with cement mortar to form a composite pavement with a two-layered structure (upper and lower). The lower layer filled with a mixture of styrene-butadiene rubber and styrene-butadiene rubber exhibits a high degree of compressive strength, while the upper layer is made of synthetic material with so-called multiple functions that exhibits durability, that is, oil resistance, heat resistance, and abrasion resistance. It became a pavement. Furthermore, the fillers to be filled in the lower layer part, that is, the lower hollow part, and the upper layer part, that is, the upper hollow part, are respectively made of styrene-butadiene rubber, steel granules, or synthetic resin material. Because the material is selectively added and filled, for example, rubber-based substances such as styrene-butadiene rubber or rubber chips are added to the upper space.
When added to, elasticity was exhibited. Furthermore, when a synthetic resin material, that is, a plastic-based substance, was added, abrasion resistance and oil resistance were exhibited, and it was possible to construct a synthetic pavement body with functions depending on the characteristics of the filled material. As mentioned above, since a water reducing agent and styrene-butadiene rubber are added to the cement paste filled into the lower space of the base, the effect of the water reducing agent is to prevent water from rising to the surface, or breathing, when the cement paste hardens. suppressed. In addition, since styrene-butadiene rubber is added, a small amount of styrene-butadiene rubber exists as floating matter in the water that floats up during curing, and as a result, the bonding with the cement mortar filled in the upper cavity becomes difficult. Since this is done through styrene-butadiene rubber, the bonding and adhesion properties are improved. Furthermore, since the hollow space of the pavement itself is grouted with cement paste or cement mortar, the shrinkage and expansion due to temperature of the filler bitumen that covers the aggregate of the bituminous pavement, that is, the synthetic pavement, is buffered. , it suppresses the occurrence of cracks due to expansion and contraction caused by temperature changes after paving, and is not only durable, but also has multiple functions such as flexibility or elasticity depending on the intended use of the paved road or floor surface. A composite pavement body was obtained. [Example] Further, the synthetic pavement according to the present invention will be specifically explained based on the example shown in the drawings. First, FIGS. 1 and 2 are cross-sectional views showing the structure of a synthetic pavement according to the present invention. 1 is a pavement cross section, 2 is a roadbed, 3 is a base layer, and 4 is a base of the composite pavement of the present invention. That is, the substrate 4 is made of a bituminous mixture having a void. In this example, the substrate 4 was constructed by paving an open-grained asphalt mixture, which is generally used as anti-slip pavement, using a conventional paving means. That is, it was constructed with a bituminous mixture consisting of an aggregate 5 such as crushed stone and a filler bitumen (a mixture of stone powder and asphalt) 6 covering the periphery of the aggregate 5. Note that the void ratio is preferably at least 18 to 28% (volume ratio) from the perspective of filling with cement paste, cement mortar, etc.
It is not limited to this. Next, the mixture to be filled into the lower cavity of the base body 4, that is, the cement paste 7 containing a water reducing agent and styrene-butadiene rubber, is mixed in such a manner that the mixing ratio of cement and water is 1:0.5 and 1:0.6 by weight. A water reducing agent as a solid content was added to the cement paste at a ratio of 1.0% based on the weight of the cement, and styrene-butadiene rubber was added and mixed as a solid content of 15% based on the weight of the cement. . The filling method was to first spread a mixture having the above-mentioned mixing ratio on the upper surface of the substrate 4, and apply a vibrating roller over the mixture to permeate and fill the mixture. Next, after filling the cement paste containing the water reducing agent and styrene-butadiene rubber, mortar 8, 9 is filled on top of it, that is, in the upper cavity of the base 4, as shown in FIGS. 1 and 2. I laid it down. As a result, the cement paste 7 and the mortar 8 or 9 were adhesively bonded in the lower and upper cavities of the base body 4 and together constituted a durable synthetic pavement. Furthermore, the breathing rate (volume ratio) when filling the lower cavity with cement paste containing a water reducing agent and styrene-butadiene rubber was 12.7%.
~17.8%, and the 7-day compressive strength of the composite pavement obtained by filling mortar and leveling it was 181%.
Kg/ ^cm2 to 131Kg/ ^cm2 . In particular, the addition of the water reducing agent and styrene-butadiene rubber improved the permeability and adhesion of the cement paste to the substrate 4. Furthermore, as mentioned above, breathing during setting of the cement paste is suppressed, and the filler bitumen that covers the aggregate of the synthetic pavement and the cement paste containing styrene-butadiene rubber combine to prevent expansion due to temperature changes after hardening.・It also helps to suppress the occurrence of so-called cracks caused by shrinkage. Therefore,
Unlike common concrete pavements, there is no need to set joints, and we have been able to provide a synthetic pavement that is extremely durable and can be constructed economically. Table 1 below shows the two-layered composite pavement of the present invention in which the mixture filled in the lower hollow part and the mixture filled in the upper hollow part have the following compositions, and the conventional general It compares and displays the results of tests such as the marshal test with a standard semi-rigid pavement, that is, a single-layer semi-rigid pavement. Lower cavity = Filling mixture Cement/water mixing ratio 1:0.5 Water reducing agent (cement weight ratio) 1.0% Styrene/butadiene rubber (cement weight ratio)
15% upper air = filling mixture (add mortar, sand)

【table】

[Table] As is clear from Table 1, the lower part of the hollow base 4 is filled with cement paste containing a water reducing agent and styrene-butadiene rubber, and the upper part is filled with cement mortar. It is understood that this results in improved stability as a pavement and superior oil resistance, heat resistance, and static load resistance compared to conventional semi-rigid pavement. Particularly, dramatic effects are demonstrated for wheel tracking tests. The aggregate for the cement mortar filled in the upper cavity is not limited to general sand, but also granular materials such as iron and tungsten steel,
Furthermore, it is also possible to use fibrous materials or the like. If these materials are appropriately selected and used in addition, impact resistance, electrical conductivity, and abrasion resistance can be imparted, and the composite pavement can be used as a composite pavement suitable for the purpose of use. Table 2 shows a composite pavement structure consisting of a two-layer structure as an embodiment in which tungsten steel granules are added to cement mortar to fill the upper cavity and the upper cavity is filled and leveled. This shows the results of tests conducted on common test items for conventional semi-rigid pavement filled with cement mortar and leveled.

[Table] As is clear from Table 2, when steel granules are added to the cement mortar filled in the upper cavity and filled and spread, synthetic pavement with significantly improved compressive strength and impact resistance. You get a body. Next, Table 3 shows an embodiment in which the upper cavity is filled with a mixture of so-called plastic mortar, in which epoxy resin-based and urethane resin-based plastic materials are added to the cement mortar, and the two layers are laid flat. This figure shows the strength test results of structural composite pavement.

〔Effect of the invention〕

The synthetic pavement according to the present invention can provide a pavement suitable for the intended use of the road or floor surface to be paved as follows. (1) First, basically, the base material that constitutes the synthetic pavement,
In other words, a cement paste containing a water reducing agent and styrene-butadiene rubber is filled into the lower part of the asphalt mixture, which has voids like open-grained asphalt concrete, and the upper part is filled with a cement paste containing a water reducing agent and styrene-butadiene rubber.
The parts are made of materials that can exhibit flexibility and elasticity, such as abrasion-resistant steel granules, chemical-resistant synthetic resin materials, styrene-butadiene rubber, or rubber chips. When selectively added mortar is filled and spread, a two-layered pavement is obtained which has a composite function of rigidity in the lower layer and flexibility or elasticity in the upper layer. Therefore, in consideration of the characteristics of this complex function, when paving roads that are subject to heavy vehicle loads, the upper space should be filled with cement mortar to which styrene-butadiene rubber or steel granules are selectively added. , by laying it down, you can obtain a pavement suitable for the purpose. In particular, water reducing agents and styrene-butadiene rubber are added to the cement paste filled in the lower cavity, which suppresses breathing during solidification of the cement paste, resulting in better bonding with the cement mortar filled above. The bond between the lower layer and the upper layer was improved. In addition, in the case of pavements that require elasticity such as ply grounds, fill with mortar containing styrene-butadiene rubber, rubber chips, or urethane resin-based plastic.
By leveling the pavement, you can obtain pavement that is suitable for its intended use. Furthermore, when paving a yard in a factory where chemicals are handled, the paving can be done using chemical-resistant plastic mortar. In other words, various materials with material properties such as chemical resistance, abrasion resistance, heat resistance, and even flexibility and elasticity are used as fillers, mainly mortar, in the upper cavity, which is the upper layer of the pavement. By selectively adding and paving, it is possible to perform pavement that is suitable for the intended use of the road or floor surface to be paved. Moreover, in the present invention, a water reducing agent and styrene-butadiene rubber are added to the cement paste to be filled into the lower cavity, so that the effect of suppressing breathing can be exerted. When filled with cement mortar, both are firmly adhesively bonded and integrated. As a result, there is no fear that the mortar on the surface will peel off. In other words, the lower layer and upper layer are strongly connected and integrated, functioning as a highly durable synthetic pavement. Furthermore, the open-grained asphalt mixture that is the base has filler bits interposed between the aggregates, so the filled cement paste and cement mortar are strongly bonded, and as a result,
It exhibits stable strength and absorbency even when it expands and contracts due to impact and temperature changes. Furthermore, as a paving method, an open-grained asphalt concrete mixture is simply paved using the usual method, and this paved porous pavement is infiltrated with cement paste, and then mortar is added with materials suitable for each paving purpose. Since it only requires filling and leveling, the construction work is simple and extremely economical. Furthermore, since it does not require construction of joints, it is highly economical and can be uniformly constructed over a wide area such as a yard. Furthermore, unlike cement concrete pavement, it does not require a curing period, so the construction period is short, and in this respect it is also highly economical. As described above, the synthetic pavement according to the present invention is
It can be applied to various roads, factory warehouse floors, collection areas, playing courts, etc., and can be applied not only to new construction but also to repair work of various pavements such as existing asphalt pavement and cement concrete pavement, without interfering with daily operations. It is possible to obtain paved roads or paved yards that can be opened in a short period of time.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of synthetic pavement bodies according to embodiments of the present invention, respectively. 4...Base of open grain asphalt pavement, 7...
Cement paste, 8, 9...mortar.

Claims (1)

[Scope of Claims] 1. A synthetic pavement in which a mixture of a water reducing agent, cement paste, and styrene-butadiene rubber is filled in the lower space of a bituminous pavement having a space, and cement mortar is filled in the upper space. A pavement structure consisting of a body. 2. The synthetic pavement according to claim 1, wherein the cement mortar filled in the upper space is a cement mortar containing granular steel material. 3. The synthetic pavement body according to claim 1, wherein the cement mortar filling the upper space is a plastic mortar further containing styrene-butadiene rubber, rubber chips, or a synthetic resin material.