JP3334508B2 - Method of exposing aggregate on concrete pavement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of exposing aggregate on a concrete pavement surface, and more particularly, to a method of exposing a concrete pavement on a concrete pavement surface to reduce road surface noise which is considered to be higher in noise than asphalt pavement. It relates to the method of exposing materials.

[0002]

2. Description of the Related Art It has been known that tire / road noise generated when a vehicle tire passes over a pavement surface is higher on concrete pavement than on asphalt pavement. It is a bottleneck when applying concrete pavement.

[0003] On the other hand, it has been found that the tire / road surface noise can be considerably reduced by optimizing the surface shape of the concrete pavement surface. Attempts are being made to finish or to cast porous concrete on the surface layer.

[0004] Among them, the method of exposing the aggregate involves removing the mortar of the surface of the concrete constituting the surface layer of the pavement surface to form an exposed surface of the aggregate having a desired texture depth. This reduces tire / road noise.

[0005] In addition, even with such an aggregate exposing method,
As coarse aggregate of concrete constituting the surface layer, 10
The so-called small particle size aggregate exposing method using a small particle size coarse aggregate having a particle size of not more than 8 mm is excellent in low noise performance, and preferably uses a coarse aggregate having a particle size of 8 mm or less. Stuff and more preferably high quality size 8/4
Concrete using single-grain crushed stone having a small particle size of mm as a coarse aggregate is also employed.

[0006] As a method for shaving the mortar on the pavement surface from the concrete constituting the surface layer, high-pressure water is generally sprayed on the concrete surface, which is known as a green cut method. And a method of shaving the mortar on the surface with a brushing machine equipped with a wire brush.

[0007]

However, in the above-described method using the green cutting method or the brushing machine, it is necessary to cut the concrete before it is completely hardened at an appropriate timing. Therefore, it is not easy to manage the timing, and the construction accuracy may be influenced by the season, temperature, weather, and the like.

On the other hand, after the concrete of the surface layer is poured, a layer of a setting retarder called a retarder for delaying the setting reaction of cement is formed on the surface thereof, so that the hardening of the mortar on the surface is delayed. Adjustment, thereby adjusting the time to perform the shaving work, while a method of extending the period during which the shaving work is possible has been adopted, but according to such a method, the setting retarder used for this is There is a problem in that it is easy to elute in water, so that it takes time to manage it to exert its function effectively.

That is, for example, it is necessary to lay a curing sheet such as a vinyl sheet over the setting retarder layer in order to prevent elution due to rainwater or water sprinkling, but the entire pavement surface having a large area is required. The work of laying such a curing sheet is a complicated work, and the curing sheet is easily turned up by wind and the like. There was a problem that laying work became difficult.

Accordingly, the present invention has been made in view of such conventional problems, and delays the progress of the cement setting reaction without being greatly affected by the weather such as rainy weather. The purpose of the present invention is to provide a method of exposing aggregate on a concrete pavement surface, which can easily perform a work of shaving a mortar portion for exposing a mortar, thereby easily obtaining an exposed surface having a uniform texture depth. Is what you do.

[0011]

Means for Solving the Problems The present invention has been made to achieve the above object, and the gist of the invention is to spread concrete forming the surface layer of a pavement surface, and then to make the surface of the concrete It does not dissolve in water but hydrolyzes in alkaline water and is covered with a setting retarder that develops the setting retardation of cement. After the curing period, the mortar on the surface is cut out to expose the aggregate. Concree
A method of exposing aggregate on a pavement surface, wherein
An extender containing glycol and a dibasic acid as main components,
Unsaturated polyester having an average molecular weight of 300 to 25,000
With 100 parts by weight of the unsaturated polyester
Crosslinked with 50 to 50 parts by weight of a styrene monomer
And a method of exposing aggregate on a concrete pavement surface , which is used as a sheet having a small thickness .

Further, according to the method for exposing aggregate of the present invention, at least the coarse aggregate of concrete forming the surface layer of the pavement surface is formed on a concrete pavement surface which is a small-grain coarse aggregate having a particle diameter of 10 mm or less. It is preferable to adopt it.

[0013]

The unsaturated polyester glycol is mainly composed of a dihydric alcohol such as ethylene glycol or propylene glycol or a polyoxyalkylene glycol which is a polymer thereof, and this glycol is 50 to 100% by weight based on the weight of the glycol component. Is preferable.

The styrenic monomer is added as a cross-linking component for curing the unsaturated polyester, which is often oily, and improves the mechanical properties of the unsaturated polyester as a resin.
It is added for the purpose of controlling water resistance as a retarder, and besides this, for example, methyl acrylate,
Ethyl acrylate, butyl acrylate, alkyl acrylate, hydroxyethyl acrylate, and methacrylates thereof can be used, and one or more of them can be used as a polymerization monomer.

Further, when the unsaturated polyester resin is cured, the styrene is polymerized with a radical initiator such as an organic peroxide, and at the same time, the unsaturated polyester is crosslinked with the unsaturated polyester. However, in order to cure in a short time of about 1 hour or less, it may be performed under a temperature condition of about 60 to 200 ° C.
In order to further promote crosslinking, a curing accelerator such as an organic acid salt of cobalt can be used in combination.

According to the setting retarder, when the weight average molecular weight of the unsaturated polyester is less than 300, the setting retarding effect is reduced. When the weight average molecular weight of the unsaturated polyester exceeds 25,000, the melt viscosity is increased. The addition of styrene-based monomers described below becomes difficult due to an increase in the content of styrene-based monomers, and neither is preferred.

If the amount of the styrene monomer is less than 1 part by weight based on 100 parts by weight of the unsaturated polyester, the mechanical properties and water resistance of the unsaturated polyester are not sufficiently improved. If the amount is more than 50 parts by weight with respect to 100 parts by weight of the unsaturated polyester, the retarding effect of the setting retarder becomes insufficient.

According to the method for exposing aggregate on a concrete pavement surface of the present invention, since the setting retarder has a property of not dissolving in water, the setting retarder is eluted by rainwater or the like. Absent.

The unsaturated polyester resin constituting the setting retarder, for example, an unsaturated polyester resin is hydrolyzed by an alkali contained in the cement to form a polyester oligomer and further a glycol and a dibasic acid. In addition to suppressing the reaction, the decomposition products generated by the hydrolysis are adsorbed on the surface of the cement particles, so that the effect of suppressing the hydration reaction of the cement is maintained for a long time. Even for concrete pavements that have been cured for a long period of 28 days, the mortar on the surface can be easily cut off.

That is, according to the present invention, after the concrete constituting the surface layer of the pavement is spread, the setting retarder having the above-mentioned properties is applied to the surface of the concrete by, for example, 0.1 to 0.5 mm. Degree, preferably 0.2
By covering and adhering as a sheet having a thickness of about mm, without using a curing sheet particularly, and without being particularly affected by the weather such as rainy weather, delaying the progress of the cement setting reaction, This facilitates the work of shaving the mortar for exposing the aggregate, and makes it possible to easily obtain a concrete pavement surface having a uniform texture depth.

Further, the method for exposing the aggregate of the present invention is a concrete pavement in a so-called small-grain aggregate exposing method using a coarse aggregate having a particle size of 10 mm or less as a coarse aggregate of concrete constituting a surface layer. Especially if you use
A uniform exposed surface having a texture depth of about 1 mm can be easily secured, and a concrete pavement surface having even lower noise can be easily obtained.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention, ie, an embodiment, will be described below in detail with reference to the accompanying drawings. According to this embodiment, in a so-called small particle size aggregate exposing method for concrete pavement, a particle size of 10 mm or less, preferably 8 m, constituting a surface layer portion.
high quality size 8 as coarse aggregate with a particle size of
After concrete containing / 4 mm small grain crushed stone is hardened, mortar is cut out from the surface of this concrete,
In order to secure a uniform exposed surface having a texture depth of about 1 mm on the pavement surface, the method for exposing aggregate on a concrete pavement surface of the present invention is employed.

That is, the concrete pavement surface formed by the method of exposing small-grain aggregates has a low noise level equal to or higher than the asphalt pavement surface by reducing tire / road surface noise such as air pumping noise. Become.

According to this embodiment, as shown in FIG. 1, above the lower concrete layer 10 cast by ordinary concrete, the small concrete having the size of 8/4 mm is formed as the concrete constituting the surface layer. The small-grain aggregate-mixed concrete 11 made of single-grain crushed stone is used as a coarse aggregate, for example, is spread to a thickness of about 4 cm and is compacted.

It is not always necessary to cast such a small-grain aggregate-mixed concrete 11 only on the surface layer portion. For example, if economical efficiency permits, the entire thickness of the concrete pavement can be reduced by the small-grain aggregate-mixed concrete. It can also be constituted by concrete 11.

After the small-grained aggregate-mixed concrete 11 of the surface layer is spread and spread, the surface thereof is not dissolved in water but hydrolyzed with alkaline water,
As a setting retarder that expresses the setting retardation of cement,
Setting retardation obtained by crosslinking an unsaturated polyester having a glycol and a dibasic acid as main components and a weight average molecular weight of 300 to 25,000, with 1 to 50 parts by weight of a styrene monomer based on 100 parts by weight of the unsaturated polyester. An operation of covering with the agent 12 is performed.

Here, the setting retarder 12 can be used as a sheet having a thickness of, for example, about 0.2 mm. Since it has flexibility, by laying it, even if unevenness is present on the surface of the spread small-grained-aggregate-mixed concrete 11, it can easily adhere to the surface following the unevenness. .

While the surface is covered with the setting retarder 12 in this manner, the small-grain aggregate-mixed concrete 11 is cured for a predetermined period of time. It has the property of not dissolving, does not elute due to rainwater or the like, and can perform a curing operation without particularly installing a curing sheet for rainwater countermeasures and the like.

The setting retarder 12 is in contact with the concrete 11 on the surface and hydrolyzes with alkaline water, thereby suppressing the hydration reaction of the cement and maintaining the suppressing effect for a long period of time. Since it is possible, the start time of the operation of shaving the surface mortar is not particularly limited. For example, even for the small-grain aggregate-mixed concrete 11 after performing the long-term curing of 28 days old, It is possible to easily perform the surface treatment.

Further, a concrete having a small particle size aggregate 11
The setting retarder 12 laid on the surface of the concrete has a thickness of about 0.2 mm, and not all of it hydrolyzes in alkaline water in the concrete. The surface of the small-grain aggregate-mixed concrete 11 can be prevented from drying while maintaining the state of covering the surface of the concrete.

As shown in FIG. 2, the setting retarder 12 is preliminarily fixed to a flexible sheet or paper 13 at the stage of its production, as shown in FIG. By setting the setting retarder 12 on the lower surface side and covering the surface of the small-grain aggregate-mixed concrete 11 with the sheet member 14, the setting retarder 12 can be brought into close contact with the surface. By
Since the sheet member 14 has sufficient flexibility due to its thin thickness of about 0.5 mm, even if unevenness is present on the surface of the spread small-grain aggregate-mixed concrete 11, Following this, the setting retarder 12 easily adheres to the surface.

According to the laying method shown in FIG. 2, the sheet or paper 13 disposed on the upper surface side of the sheet member 14
Drying of the surface of the small particle size aggregate-mixed concrete 11 is easily prevented.

After the spread small-grain aggregate-mixed concrete 11 has been cured for a predetermined period of time, an operation of shaving mortar from the surface thereof is performed.

That is, such a shaving operation is performed by a green cut method, which is a method of cleaning the mortar by spraying high-pressure water, or a method of shaving the mortar on the surface by a brushing machine equipped with a wire brush. However, since the hardening of the mortar is delayed due to the effect of inhibiting the hydration reaction of the cement by the setting retarder 12, the shaving operation can be easily performed, and the setting retarder is used. 12, since the hydration reaction of the cement was suppressed by closely adhering to the surface of the small particle size aggregate-mixed concrete 11, the pavement surface after cutting out the mortar had a texture depth of about 1 mm. A uniform exposed surface can be easily secured.

Accordingly, by having such an exposed surface, tire / road surface noise such as air pumping noise is reduced, and a concrete pavement excellent in low noise is formed.

The present invention is not limited to the embodiment of the above embodiment, but may be variously modified and adopted within the scope of the constitution described in each claim. For example, setting retarder 12 is not soluble in water, is hydrolyzed in an alkali solution, if retarder to express retarders of cement, having a composition as described above in Example However, the present invention is not limited to this.

EXPERIMENTAL EXAMPLE 1 An unsaturated polyester containing glycol and a dibasic acid as main components and having a weight average molecular weight of 300 to 25,000 was added to 1 to 50 parts by weight of a styrene monomer based on 100 parts by weight of the unsaturated polyester. By setting 50 mg of a setting retarder composed of those cross-linked in a sheet form having a thickness of about 0.1 mm, immersing the sheets in water and alkaline water having a pH of 13 at room temperature, taking out each hour, and measuring the weight thereof. And the elution amount was determined. Table 1 shows the test results.

[0039]

[Table 1] The above test results show that the setting retarder does not dissolve in water, but readily elutes in alkaline water having a pH of 13.

EXPERIMENTAL EXAMPLE 2 An unsaturated polyester containing glycol and a dibasic acid as main components and having a weight average molecular weight of 300 to 25,000 was added to 1 to 50 parts by weight of a styrene monomer based on 100 parts by weight of the unsaturated polyester. 200 mg of a setting retarder composed of those cross-linked in a sheet form having a thickness of about 0.2 mm, immersed in water and alkaline water having a pH of 13 at room temperature, taken out every hour, and measuring the weight thereof. And the elution amount was determined. Table 2 shows the test results.

[0041]

[Table 2] According to the above test results, the setting retarder does not dissolve in water, but easily elutes in alkaline water of pH 13, but only about half elutes even after 12 hours,
Therefore, it is clear that even if the setting retarder is laid thick, not all of it elutes in the alkaline water.

[0042]

As described above in detail, the method for exposing aggregate on a concrete pavement surface according to the present invention does not dissolve the spread concrete surface in water but hydrolyzes it in alkaline water. It is constituted by covering with a setting retarder that expresses the setting retardation of cement and, after the aging period, extruding the mortar on the surface to expose the aggregate, and the setting retarder has a small thickness. Sheet
Because of its flexibility ,
When unevenness is present on the level concrete surface.
Even following this, it can easily adhere to the concrete surface, so that the progress of the cement setting reaction is delayed without much influence by the weather such as rainy weather, and the aggregate is exposed. Work for shaving the mortar can be easily performed, and a concrete pavement having an exposed surface with a uniform texture depth can be easily obtained.

In particular, when the concrete constituting the surface layer is a concrete containing a small-grain coarse aggregate having a particle size of 10 mm or less, the pavement surface has a texture depth of 1 mm.
It is possible to easily secure a uniform exposed surface of about mm and easily form a concrete pavement having further excellent noise reduction.

[Brief description of the drawings]

[Fig. 1] The concrete surface of the surface layer
FIG. 4 is a cross-sectional view showing a state where the cement is not dissolved in water but is hydrolyzed with alkaline water to be covered with a setting retarder that develops the setting retardation of the cement.

FIG. 2 is a cross-sectional view showing a state in which a setting retarder is laid on the surface of concrete in a surface layer in a state where the setting retarder is fixed to a flexible sheet or paper in advance.

[Explanation of symbols]

Reference Signs List 10 lower layer concrete 11 small particle size aggregate-mixed concrete (surface layer concrete) 12 setting retarder

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-53447 (JP, A) JP-A-3-272803 (JP, A) JP-A-10-36155 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) E01C 7/14 E01C 7/32

Claims (2)

(57) [Claims] After the concrete constituting the surface layer of the pavement surface is spread, the surface of the concrete is not dissolved in water, but is hydrolyzed with alkaline water to develop the setting retardation of the cement. Cover with concrete retarder, after the curing period, remove the mortar on the surface and expose the aggregate on the concrete pavement surface to expose the aggregate.
The method, wherein the setting retarder comprises a glycol and a dibasic acid as main components.
And an unsaturated poly having a weight average molecular weight of 300 to 25,000.
The ester is added to 100 parts by weight of the unsaturated polyester.
And crosslinked with 1 to 50 parts by weight of a styrene monomer.
A method of exposing aggregate on a concrete pavement surface, wherein the method is used as a sheet having a small thickness . Wherein said coarse aggregate of the concrete that constitutes the surface layer of the pavement is Conch according to claim 1, characterized in that a small径粗aggregate with a particle size of 10 mm <br /> A method of exposing aggregates on REIT pavement surface.