JP2000169720A - Asphalt mixture suitable for underwater application and application apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an asphalt mixture which can form a thin layer even in water and gives a diaphragm wall excellent in watertightness, flexibility, and durability by compounding a mineral aggregate, an elastic aggregate, asphalt, and a coupling agent for uniting the elastic aggregate with asphalt. SOLUTION: This mixture comprises 10-30 wt.% asphalt having a penetration of 40-120, 50-80 wt.% mineral aggregate (e.g. powdered stone filler), 10-40 wt.% elastic aggregate having a particle size of 0.6-20 mm and comprising a rubber mainly comprising natural rubber, 0.1-10 wt.% coupling agent for uniting the elastic aggregate with asphalt and selected from among ε-caprolactam, iron octanoate, etc., and 1-15 wt.% fluidizing agent (e.g. paraffin). The application method of the mixture comprises applying an adhesive (e.g. an epoxy resin) having an adhesive power in water to an underwater asphalt or concrete facing layer and applying thereto the mixture flatly and continuously in a thickness of 7 cm or lower with an underwater execution apparatus to form a diaphragm wall.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt mixture suitable for underwater construction, and more particularly to an asphalt mixture suitable for constructing a water impervious wall in a state where water is present in a dam or a reservoir.

[0002]

2. Description of the Related Art Water shielding in hydraulic structures is not only necessary for achieving the hydraulic structure construction purpose of water storage, but also essential for the stability of the hydraulic structures themselves. It is. Reinforced concrete, steel plate, polymer chemical products, etc. are used as the water-blocking material. Among them, the asphalt mixture has water-tightness, flexibility, self-healing, acid resistance, and base resistance. In recent years, it has been used as a water barrier in many dams and reservoirs because it has various properties such as excellent workability.

[0003] Asphalt impermeable walls are classified into asphalt surface impermeable walls and asphalt inner impermeable walls. The asphalt surface impervious wall is called asphalt facing. Among the asphalt facings, the asphalt surface impermeable wall that is built on the entire inner surface of the reservoir is called an asphalt lining, and the asphalt inner impermeable wall is generally called an asphalt core.

The asphalt surface impermeable wall is generally composed of one or two upper layers, a drainage layer, a lower layer, a leveling layer and a macadam layer from the surface, and the surface of one or two layers and the lower layer are watertight. A dense dense asphalt mixture is used. The drainage layer sandwiched between the surface of one or two layers and the lower layer drains water from the upper layer immediately into the cut-off corridor and monitors leakage of the asphalt impermeable layer. And an open particle size asphalt mixture is used. As described above, the lower layer is constructed of watertight dense-grained asphalt concrete, but the importance of impermeable is smaller than that of the upper layer, which prevents the permeated water that has penetrated into the dam body from flowing to the drainage layer. The leveling layer and the Macadam layer serve as the foundation for the lower layer, and in particular, the Macadam layer is intended to form a strong base by engaging with the aggregate of the transition. For the leveling layer, a coarse-grained asphalt mixture is used, and for the macadam layer, a mixture of coarse and poor asphalt is used.

The asphalt mixture used for the asphalt surface impermeable wall is finished by a leveling machine and a rolling machine in the same manner as a normal asphalt mixture, but since the asphalt surface impermeable wall is a slope, the winch porter is installed on the slope top. The asphalt finisher for slopes and a damper truck for supplying the asphalt mixture thereto are leveled by pulling in the direction of the slopes by wires. The leveling is performed from the cutoff toward the upper slope. The mixture is supplied from the mixture carrier to the damper by means of a bucket, which is suspended by a crane. The damper vehicle ascends and descends the slope direction by a winch of a winch porter separate from a winch for pulling the slope asphalt finisher, and supplies the asphalt mixture to the slope asphalt finisher. When paving of one lane is completed, the damper truck and the asphalt finisher for slope are stored in the winch porter, the winch porter is moved to the next lane by self-propelled, and the same procedure is repeated. The primary rolling pressure is pulled from a winch deck provided on a slope asphalt finisher using a hand-guided vibration roller. The secondary rolling is performed by a vibrating roller pulled from a winch tractor arranged at the top of the slope.

[0006] Since the asphalt mixture used for the asphalt surface impermeable wall is provided on a slope, it is required to have water tightness, stability, deflection, and durability. Water tightness may be referred to as impervious, but a compact dense asphalt mixture having a water permeability of 10 ^-8 cm / s. It is conceivable by design to increase the permeability to a degree where the amount of permeability is extremely small compared to the amount of storage.
Practically, the durability of the fine-grained asphalt mixture is reduced, which is not preferable. That is, it is known that the water permeability of the dense-grained asphalt mixture depends on the porosity of the mixture, and the penetration of water into the voids promotes the peeling of the asphalt film.

[0007] Stability can be divided into stability against shear fracture due to its own weight and stability against flow, but it is said that internal shear fracture does not matter in ordinary asphalt mixtures. Slope flow is a condition that flows down the slope along the slope, and the stability against this is determined by the shear viscosity coefficient (Poise, 60 ° C.,
48Hr). Generally, if the shear viscosity coefficient is 10 ¹⁰ or more, there is no problem of slope flow.

Although the flexibility is an important advantage of the asphalt impermeable wall, it is not possible to expect the property excessively, and it is important to take care to minimize the deformation of the dam body and the like. Although there has been no established bending amount test, it is considered that a specimen having a diameter of 50 cm has a sufficient degree of deflection so that cracks do not occur even when the central bending becomes 1/10 of the diameter.

The durability is affected by freezing and thawing, ultraviolet rays, water immersion, and the like, but resistance to driftwood collision is also required.
The test methods include a freeze-thaw test, an ultraviolet irradiation test, a water immersion marshall test, and a push-out test.

[0010] The asphalt internal impermeable wall has a shorter history than the asphalt surface impermeable wall, and is not widely used. This is mainly because the asphalt surface impervious wall has the advantage that it can be directly inspected when the water level drops and that the road paving technology can be applied to construction.
In addition, for application in Japan, which is an area where earthquakes frequently occur, the reliability of the asphalt internal impermeable walls has not been confirmed.

[0011] However, the advantage of the asphalt internal impermeable wall compared to the asphalt surface impermeable wall can be given. First of all, the emphasis is on the asphalt surface impervious walls, which can be damaged by flooding, exposed to severe weather conditions and hit by falling rocks and driftwood. There is no such thing in the internal impermeable wall, and it is hardly deteriorated or damaged.

Another emphasis that asphalt internal impermeable walls are advantageous over asphalt surface impermeable walls is that:
It is economical. While the asphalt surface impermeable wall is applied to the slope, the asphalt internal impermeable wall is constructed almost vertically, so the construction area and construction volume are naturally small. Even in the construction, the asphalt surface water barrier requires extremely large-scale mechanical knitting, while the asphalt inner water barrier can be constructed with a simple machine as described below.

The construction method called asphalt concrete of the asphalt inner water-blocking wall is a method of laying out by using a special machine for each spreading thickness of the embankment material and compacting with a vibrator to obtain a vertical thickness of 40 to 70 cm. It builds walls.

The change in the temperature inside the dam is much smaller than the change in the temperature of the asphalt surface impermeable wall, and the slope flow which is a problem in the asphalt surface impermeable wall is hardly a problem. It is known that the pressure exerted by the mixture of the asphalt inner impermeable walls on the fill material by its own weight is balanced with the earth pressure of the fill material.

Other asphalt mixtures used for water works include asphalt mastics. Asphalt mastic is a mixture that shows high fluidity, and heat-mixed asphalt mastic is poured into voids such as crushed stones that form part of the structure or voids in the structure, solidified by filling, and resists wave power and water flow It is to make a structure.

The casting of asphalt mastic by casting is applied to places where it is difficult to compact underwater parts. In order to ensure watertightness, the mixture is formulated with increased fluidity, and the mixture temperature during construction is as high as about 180 ° C. Asphalt mastic is poured using a chute above the water or in a place where the water is shallow, and it is general to use a bucket in water, but it is also possible to use a pipe such as a tremy pipe.

[0017]

Although the asphalt inner water impervious wall has an economical and rational structure as compared with the asphalt surface impervious wall, the asphalt mixture has a limit to the material having a dewarping property. And it is not possible to monitor them directly. For this reason, its application is hesitant in Japan in an earthquake prone area, and most of asphalt mixtures having excellent performance as a water-blocking material have been adopted as asphalt surface water-blocking walls.

However, in recent years, the surface layers of dams and reservoirs provided with an asphalt surface impermeable wall using an asphalt mixture have deteriorated beyond their useful lives, and cracks and the like have become remarkable. However, emptying a dam for a long period of time is usually not allowed in flood control plans, so it is not possible to perform full-scale repairs such as overlay with asphalt mixture. On the other hand, a method of attaching a waterproof sheet has been performed, but there is a problem that the expansion coefficient of the existing asphalt surface water impervious body and the sheet are different, and there is a problem that the waterproof sheet is broken by driftwood, falling rocks, and to solve the problem Not yet. Therefore, in order to effectively repair the surface of dams and reservoirs, it is desirable to develop an asphalt mixture that can be constructed in water and a thin-layer construction technique using the same.

Asphalt mastics are known as asphalt mixtures that can be constructed underwater. Existing asphalt mastics are used to fill gaps such as crushed stones to prevent scouring or the like by a water flow and to prevent water penetration.
That is, it is not intended to block water. Asphalt mastic itself is a highly water-tight mixture,
At the time of pouring into water, the surrounding water is evaporated due to the high mixture temperature, and it is not easy to confirm the casting situation, and it is difficult to ensure the quality.

On the other hand, in recent years, the technology of underground continuous walls has been improved, and excavation of deep trenches has been facilitated. The underground continuous wall is a structure made of reinforced concrete or steel concrete in a trench formed by excavation using a stable liquid such as muddy water. Digging deeper trenches and replacing the mud in such trenches with a water-tight and stiff asphalt mixture;
That is, it is possible to construct an asphalt internal impermeable wall. In order to apply the above-mentioned asphalt concrete as the asphalt mixture used in this case, since it is impossible to compact an extremely thick layer, the mixture must be impossible and can be poured.
Asphalt mastics have been used as this mixture in some cases, but their ability to follow dams is poor, and their reliability against earthquakes is insufficient.
There is a need for a new mixture for asphalt internal impermeable walls that can cope with ground deformation without the need for compaction.

An object of the present invention is to solve these problems. More specifically, the object of the present invention is to be able to work in a thin layer even in water, to be able to finish without rolling compaction, and to be excellent in watertightness, flexibility, and durability. Asphalt mixture suitable for impermeable walls capable of responding to displacement, impact force and seismic displacement, and a thin asphalt surface impermeable wall using this asphalt mixture,
And an asphalt underground impermeable wall using the asphalt mixture.

In other words, an object of the present invention is to provide a water-tight container at a temperature of about 100 ° C. which can be used for underwater work and has sufficient fluidity so that watertightness can be ensured without the need for rolling. It is an object of the present invention to provide a mixture for asphalt impermeable walls which can maintain a stable property without a barrel under normal temperature conditions and which is rich in durability and durable, and an asphalt impermeable wall body using the same. It is a further object of the present invention to provide an apparatus suitable for underwater construction of an asphalt mixture as described above.

[0023]

According to the present invention, there is firstly provided in an asphalt mixture comprising mineral aggregate, elastic aggregate and asphalt, a coupling agent capable of integrating asphalt and elastic aggregate. An asphalt mixture suitable for underwater construction. The present invention secondly resides in the above asphalt mixture, wherein the elastic aggregate is an aggregate mainly composed of natural rubber. Thirdly, the present invention is characterized in that the coupling agent is a coupling agent selected from the group consisting of a polymer compound, a surfactant, a nitrogen-containing compound, an oxygen-containing compound, a sulfur-containing compound and a ketone. In the asphalt mixture. Fourth, the present invention resides in the above asphalt mixture further containing a superplasticizer. Fifth, the present invention resides in the above asphalt mixture, wherein the superplasticizer is paraffin. The present invention sixthly resides in the above asphalt mixture, wherein the elastic aggregate is a natural rubber aggregate having a particle size of 0.6 to 5.0 mm. Seventh, the present invention resides in a thin-layer surface impermeable wall mainly constructed in water using the above asphalt mixture. Eighth, the present invention resides in an internal water-blocking wall constructed using the above asphalt mixture.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The asphalt mixture suitable for underwater construction according to the present invention contains asphalt, mineral aggregate, elastic aggregate and a coupling agent as essential components. Asphalt used conventionally for pavement is appropriately used as the asphalt to be used. In particular, the penetration is 40-120,
More preferably, 60 to 80 petroleum asphalts are preferable. Mineral aggregates include fine aggregates, especially fillers such as sand and stone powder. Coarse aggregate and the like can be used together, but usually sand and stone powder are used.

As the elastic aggregate, those usually called rubber aggregates, particularly those mainly composed of natural rubber, are preferably used. As an aggregate mainly composed of natural rubber, RS
NR alone such as S, PC, SMR, SIR, TTR, SCR, SSR, or SBR, BR, IR, C
R, IIR, EPDM, NBR, silicone rubber, FK
M, CSM, CM, ACM, AMM, CO, GPO, E
Some of them are formed by blending SR such as VA, and recycled rubber obtained by pulverizing tires for large vehicles is also preferably used. These elastic aggregates have a particle size of 0.1.
It is preferable to use one having a thickness of 6 to 20 mm, particularly when a thin layer having a thickness of less than 5 cm is constructed, and it is particularly preferable that the maximum particle size of the rubber aggregate is 5 mm or less.

The asphalt mixture of the present invention is characterized in that it contains a coupling agent for integrating the asphalt and the elastic aggregate. This coupling agent refers to a chemical substance that substantially increases the peel resistance between asphalt and rubber aggregate by a static asphalt peel test as compared to an asphalt mixture in which it is absent, and specific examples thereof include SBR latex. , EVA and other high molecular compounds, cationic surfactants, nonionic surfactants and surfactants such as metal soaps, nitrogen compounds such as amines and amides, and oxygen-containing compounds such as mono-, di-, poly-alcohols and ethers , Sulfur-containing compounds, ketones and the like. In particular, SBR is an example of a polymer compound that increases peel resistance.
Latex, tetraethylenebentamine as a nitrogen-containing compound, and a slow-acting vulcanization accelerator (N-
Citarohexyl 2-benzothiazolylsulfenamide and the like.

Two or more coupling agents may be used in combination. Examples of coupling agents suitable for use in combination are powdered magnesium ricinoleate (castor oil fatty acid magnesium,
Metal soap), TEPA (trade name), Noxeller CZ
(Same as above), Ultracene 633 (same as EVA), ε-caprolactam, iron octylate (metal soap), Kyowanol OX-20 (trade name), DMI (same as above), Surfynol 104 (same as acetylene alcohol), Sanfel Specific examples of the combined use include magnesium ricinoleate and Noxeller CZ, magnesium ricinoleate and Ultracene 633, Ultracene 6
33 and Kyowanor OX-20, Ultracene 633 and DMI, Noxeller CZ and Sanfel.

Although the mechanism of action of the coupling agent varies depending on the type, it is presumed as follows when a slow-acting vulcanizing agent is described as an example. By heating the asphalt mixture, a part of the sulfur or unsaturated components of the vulcanizing agent reacts with the rubber molecules to form a crosslinked structure, and the system changes from a gel phase to a solid phase as the temperature decreases while maintaining fluidity. Be replaced. Through these,
It is thought that various properties of the asphalt mixture are improved by forming a three-dimensional structure and further promoting a partial cross-linking reaction between the rubber aggregates.

As described above, the type of the coupling agent is not particularly limited as long as the peeling resistance of the elastic aggregate is substantially increased. However, in addition to the increase of the peeling resistance, the function of reducing the viscosity of the asphalt mixture and It is preferable to select one that also has a function of increasing the tensile strength.

It is desirable that the asphalt mixture of the present invention further contains a fluidizing agent. The fluidizing agent is a component having a function of lowering the application temperature of the asphalt mixture, and specific examples thereof include paraffin (wax), wax, rosin, and a crystalline low-melting polymer compound, with paraffin being particularly preferred. By adding paraffin or the like, the working temperature of the asphalt mixture can be easily lowered to 100 ° C. or less.

The optimum range of the mixing ratio of each component in the asphalt mixture of the present invention can be appropriately determined according to the specific examples of the components to be used. For example, asphalt 10 to 30%, mineral bone such as sand, stone powder, etc. Wood 50-80%,
More preferably 55-75%, elastic aggregate 10-40%,
More preferably 10-20%, coupling agent 0.1-
10%, more preferably 0.2-5%, fluidizer 1-1
It can be selected from 5% or less, more preferably from 3 to 10%.

The asphalt mixture of the present invention is excellent in the method of construction in water, and the asphalt surface impervious wall constructed using the same is rich in warpability, can follow deformation, and is resistant to driftwood collision and earthquake. Also have stable properties. Another feature of the asphalt mixture of the present invention is that the temperature during production or construction is as low as 80 to 160C, preferably 100 to 130C.

Here, an example of an underwater construction method will be described. As a specific example of construction in water, there is a construction method in which an asphalt mixture is used to repair water leakage or the like on an asphalt or concrete facing layer on a slope provided in a dam, a reservoir, or the like. Conventionally,
For this kind of repairs, drain the water and put the slope to be repaired on the water
That is, it is possible to spread the asphalt mixture for underwater construction in a thin layer on the slopes and planes in water.

More specifically, an adhesive having an adhesive force even in water is applied on the asphalt or concrete facing layer below the surface of the water, if necessary, and the asphalt mixture of the present invention is further applied thereto using an underwater construction device. It is possible to construct a flat and continuous structure with a constant thickness of usually 7 cm or less, preferably 5 cm or less, for example, 3 cm or less.

In the above, if necessary, after applying an adhesive having an adhesive force even in water, a mold having a top plate may be placed thereon, and the mold may be filled with a new asphalt mixture. It is possible.

[0036] It is also possible to apply the asphalt mixture of the present invention in the same manner as described above, not on the underwater surface of the asphalt or concrete facing layer, but on the underground surface of the ground.

As a specific example of the adhesive applied in water in the above, there is a highly durable epoxy resin (trade name: Daitosizer ow-230) for adhesion in water / wet surface. This resin is a two-part epoxy resin consisting of a main agent and a curing agent.
After mixing the main material and the curing material and applying them in water, the asphalt mixture is applied to the application surface and cured and cured to exhibit an excellent adhesive function. Further, an adhesive can be added to the asphalt mixture to enhance the adhesiveness of the asphalt mixture itself. In addition, it is also possible to mix an adhesive in advance into the mixture to obtain an adhesive mixture.

As the underwater construction device, there is a self-propelled or towed underwater construction device having a mixture storage device and a device for continuously laying the mixture supplied thereto at a constant thickness.

A particularly preferred underwater construction apparatus is an apparatus having a mixture storage device and a leveling device connected to each other and having substantially the entire portion in contact with the mixture kept warm. An example of such a device is shown in FIG. . In FIG. 11, 1 indicates a mixture storage device, and 2 indicates a leveling device such as a screed. Numeral 3 indicates the mixture in the mixture storage device, and numeral 4 indicates the leveled mixture layer. Reference numeral 5 denotes a heating mechanism such as a heater, which is arranged so that substantially the entire part in contact with the mixture is kept warm. Although the mixture can be extruded onto the existing road surface 6 by its own weight alone according to the running of the apparatus of the present invention, it is preferable to forcibly extrude the mixture using the piston member 7. When a piston member is used, since the upper surface of the mixture in the mixture storage device comes into contact with the lower surface of the piston member, it is preferable to provide a heating mechanism also for the member. Reference numeral 8 denotes an actuator for the piston member. Preferably, a gate 9 is provided between the mixture storage device 1 and the leveling device 2. Further, it is preferable that the leveling device 2 is attached to the mixture storage device 1 by a flexible member or the like so as to be movable up and down. Further, the spreader may be provided with a vibration mechanism or a cooling mechanism at the end. As described above, the apparatus of the present invention preferably keeps the mixture warm by a heating mechanism such as a heater, but actively uses a high-performance heat insulating material or a multi-insulating structure material that sufficiently achieves the heat retention of the mixture. The heating mechanism can be omitted. Examples of the positive heating mechanism include an electric heater and a fluid heater.
It is preferable to provide a heat insulating material having a positive heating function at least in the spreading device. The heating in this case may be any temperature that is sufficient to maintain the temperature of the mixture appropriately. 10 in the figure
Indicates a wheel for traveling, and 11 indicates an air intake pipe provided in a strong condition for the mixture storage device. The apparatus may be provided with a hopper if necessary, for example, to supply the mixture from a ship. In the figure, 12 indicates underwater, and 13 indicates air. Using the construction apparatus of the present invention, it is possible to construct an asphalt mixture layer having excellent properties efficiently on a horizontal surface or a slope such as a dam or a reservoir where water exists. It should be noted that the apparatus of the present invention can be used for general onshore construction other than underwater.

Next, the asphalt internal impermeable wall constructed using the asphalt mixture of the present invention can be constructed by replacing the muddy water and asphalt mixture in a groove formed by muddy water excavation. In asphalt impermeable wall mixtures, the flowability and temperature sensitivity can be easily adjusted by changing the mineral aggregate particle size, rubber aggregate and paraffin blending conditions, and can be used for installations that use tremy tubes. Available. In particular, it has excellent followability at the time of dam deformation, and it is a water impermeable wall that is sufficiently reliable against earthquakes.

[0041]

Example 1 An asphalt mixture was prepared using recycled rubber (mainly composed of natural rubber) as a rubber aggregate and Noxeller CZ (trade name) as a coupling agent, and its mechanical properties were evaluated.

FIG. 1 shows the evaluation of the bending property by the bending test.
It is. In the figure, “CP” means a coupling agent, and the numbers after the numbers indicate the blending ratio (%). CP0, CP4, CP
8 are 0%, 4%, 8%
%. Conventional mixture (CP0) has a temperature of 5
While the breaking strain at about ° C is about 1 × 10 ⁻³ , the mixture of the present invention is 1 × 10 ⁻² or more, and the followability to deformation is greatly improved.

The stability against external earthquake force is evaluated by the static elastic modulus. The static elastic modulus (Es) at the continuous water blocking wall of the asphalt mastic mixture used for the Yamamura Dam and Saburi Pond is Es (4) ≤ 800 kg in consideration of the time of the earthquake.
f / cm ² , Es (30) ≧ 50 kgf / cm ² were adopted as the criteria for studying the formulation. The test results are as shown in FIG. 2, and it can be seen that when 20% or more of the elastic aggregate is added, the mixture becomes more stable against the external force due to the earthquake.

The dynamic elastic modulus obtained from the vibration triaxial compression test is as shown in FIG. The relationship between the amount of elastic aggregate and the dynamic elastic coefficient is as follows: Ed (5) ≦ the elastic coefficient of the ground (1000 k
gf / cm ² ) × 2.5 ≒ 2500 kgf / cm ²
Is satisfied in all the formulations. As the amount of elastic aggregate increases, the dynamic elastic coefficient decreases, and it can be seen that the composition that matches the rigidity ratio with the ground can be controlled by the amount of elastic aggregate.

A load was applied to the specimen for uniaxial compression test to
FIG. 4 shows the restoring rate after 10 minutes have passed after opening after compressing by mm. As can be seen from this result, the maximum restoration rate is when the elastic aggregate amount is 20%, and the restoration rate at this time is 50%.
%. In addition, it was confirmed that the restoration rate was improved by the addition of the CP agent and the mixture was integrated as a mixture.

In the test for evaluating the resistance when a driftwood or the like hits the asphalt impermeable wall, the resistance load when a 100 mm diameter penetrating piston was pressed against the 40 mm thick asphalt impermeable wall, and the resistance load at that time Is calculated. The results are shown in FIG. 5. As can be seen from the results, even if the elastic aggregate is added, the reduction in the punching strength is small, but the displacement at the time of the punching is large, and the asphalt impermeable wall is not broken.

Example 2 A mixture for an asphalt impermeable wall having the composition shown in the following table was prepared.

[0048]

[Table 1]

The result of the water permeability test was that no water permeability was observed even at a water pressure of 2 kgf / cm ² . The air permeability in the gas permeability test was 10 × 10 ⁻¹ cm · Hg / min or less. Therefore, the mixture for asphalt impermeable walls of the present invention was determined to be impermeable. In general, the air flow rate is 2 cm · Hg / m
If it is not more than "in", the water permeability is considered to satisfy 10 ^-7 cm / sec.

The deflection characteristics were evaluated by a bending test. FIG. 6 shows the results. From this figure, it can be seen that, unlike the conventional mixture for asphalt surface impermeable walls, the bending strength is stable without a sharp increase in a low temperature range. The fracture strain is large not only in the high temperature region but also in the low temperature region as compared with the conventional mixture, and the seismic resistance is improved.

In the test for punching resistance, the resistance load when the penetration piston having a diameter of 100 mm was pressed against the 40 mm thick asphalt impermeable wall and the displacement at that time were determined. FIG. 7 shows the results. From this result, although the punching resistance load of the mixture of the present invention is not inferior to that of the conventional asphalt mastic mixture, the amount of displacement at the time of punching is larger. Therefore, it is understood that the mixture of the present invention is a mixture having excellent punching resistance as an asphalt impermeable wall.

The surface impervious wall of the asphalt mixture system causes a dilatancy phenomenon (a phenomenon in which the aggregate rises due to displacement and causes a change as if the thickness seemed to be increased) due to its own weight at a high temperature in summer, thereby lowering the density. May increase sex. However, in general, the shear viscosity coefficient (Poise, 60
(° C, 48 hr) is 10 ¹⁰ or more, it is considered that the slope flow is not a problem. The indoor slope flow test (gradient 1: 2.5) of the mixture is shown in FIG. 8, and the shear viscosity coefficient after 48 hours was 1.1 × 10 ¹⁰ poise. It is judged that there is no problem and it is stable.

A test was conducted on the temperature characteristics during underwater construction using a model experiment apparatus. The temperature drop characteristics of rubber asphalt concrete during underwater construction are as shown in FIG. As can be seen from the results, the surface temperature of the applied development mixture reached a maximum of 85 ° C., and did not boil in water. In addition, the middle part (2
The maximum temperature was about 75 ° C., and after about 10 minutes, the temperature dropped to 50 ° C. or less. In addition,
The underwater mixture of the present invention had a good finished surface without sagging.

The adhesive strength of the adhesive applied in water was confirmed by underwater application using a model experimental device. The mixture of the present invention is paved while applying the above-mentioned underwater curing type adhesive in water on the existing asphalt impermeable wall, and after the paving is completed, bonding between the asphalt surface impermeable wall of the present invention and the existing asphalt surface impermeable wall. The strength was measured. The test piece was sampled by cutting a pavement model constructed in a grid shape (about 10 cm × 10 cm). In the test, a shear test was performed at a temperature of 20 ° C. and a speed of 1 mm / min, and the shear stress and the shear strain were measured. The results are shown in FIG. As can be seen from the results, the target value of the floor slab waterproof layer of the concrete bridge (shear stress ≧ 1.5 kg)
f / cm ² , shear strain ≧ 1%), but the shear stress is somewhat lower, but it can be judged that the strength can be increased by increasing the application amount, and there is no problem in durability.

[0055]

The asphalt mixture of the present invention can prevent the mixture containing the elastic aggregate from scattering by the action of the coupling agent, and can improve the stability. It is very effective when adding functions such as deflection, elasticity, freeze suppression effect, and low noise to the pavement, and there are various applications.

The asphalt mixture of the present invention, especially the mixture for impermeable walls, has a suitable fluidity at a temperature of 100 ° C. or less and can be installed without compaction. It becomes a stable state at the hour temperature. Since there is no evaporative action in water and no compaction is required, underwater construction of a thin layer of asphalt impermeable wall is possible. In addition, the impermeable wall can respond to the seismic behavior of the ground as indicated by the static and dynamic elastic coefficients, and has a remarkable stress relaxation performance against impact force. Furthermore, the use of adhesives has enabled the construction of high quality impermeable walls. As described above, when aging dams and reservoirs, facing and lining the reservoirs, there is no need to empty the reservoirs for a long period of time, and the environment will not be polluted, and an economical and reliable repair method will be possible. Became.

Further, according to the asphalt mixture of the present invention, it is possible to construct an asphalt underground continuous wall body corresponding to an earthquake or subsidence, so that not only the water blocking of the reservoir but also the water blocking technology on soft ground and industrial waste. It can also be used as a waterproof material for landfills.

[Brief description of the drawings]

FIG. 1 is a graph showing a bending test result.

FIG. 2 is a graph showing evaluation results based on a static elastic coefficient.

FIG. 3 is a graph showing a vibration triaxial compression test result.

FIG. 4 is a graph showing the results of a compression restoration test.

FIG. 5 is a graph showing a punching resistance test result.

FIG. 6 is a graph showing a bending test result.

FIG. 7 is a graph showing a punching resistance test result.

FIG. 8 is a graph showing indoor slope flow test results.

FIG. 9 is a graph showing the results of a temperature characteristic test in water.

FIG. 10 is a graph showing the results of a shear test.

FIG. 11 is a sectional view showing an example of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Asphalt mixture storage device 2 Spreading device 3 Asphalt mixture 4 Asphalt mixture 5 Heating mechanism 6 Existing road surface 7 Piston member 8 Actuator 9 Gate 10 Wheel 11 Air intake pipe 12 Underwater 13 Aerial

Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court II (Reference) // (C08L 95/00 7:00 101: 00) (72) Inventor Masahiro Koda 1-19 Kyobashi, Kyobashi, Chuo-ku, Tokyo No. 11 Inside Nihonbudo Co., Ltd. (72) Inventor: Yu Mizobuchi 1-19-11, Kyobashi, Chuo-ku, Tokyo Nihonbudo Co., Ltd. (72) Daikan Ishikura 1-19-11, Kyobashi, Chuo-ku, Tokyo No. Nihon Hodo Co., Ltd. (72) Inventor Takayoshi Hayama 1-1-19-11 Kyobashi, Chuo-ku, Tokyo Japan Pond Co., Ltd. (72) Toshiyuki Katsu 1-19-11 Kyobashi, Chuo-ku, Tokyo Japan (72) Inventor: Nobuyuki Murata Inventor: No. 19-11 Kyobashi, Chuo-ku, Tokyo, Japan

Claims (8)

[Claims] Claims 1. An asphalt mixture suitable for underwater construction, characterized in that an asphalt mixture essentially containing mineral aggregate, elastic aggregate and asphalt contains a coupling agent capable of integrating asphalt and elastic aggregate. mixture. 2. The asphalt mixture according to claim 1, wherein the elastic aggregate is an aggregate mainly composed of natural rubber. 3. The coupling agent according to claim 1, wherein the coupling agent is a coupling agent selected from the group consisting of a polymer compound, a surfactant, a nitrogen-containing compound, an oxygen-containing compound, a sulfur-containing compound, and a ketone. Or the asphalt mixture according to 2. 4. The method according to claim 1, further comprising a fluidizing agent.
The asphalt mixture according to any one of claims 1 to 3. 5. The asphalt mixture according to claim 4, wherein the superplasticizer is paraffin. 6. A thin-layer surface impermeable wall mainly constructed in water using the asphalt mixture according to any one of claims 1 to 5. 7. An internal impermeable wall constructed using the asphalt mixture according to any one of claims 1 to 5. 8. A construction apparatus suitable for underwater construction, wherein an asphalt mixture storage device and a leveling device are connected to each other, and substantially all of the portions in contact with the asphalt mixture are kept warm.