JPH101346A - Single powder type polymer cement composition for half deflective pavement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen drying shrinkage and to improve a fluidity crack resistance and strength developability by incorporating cement, fine limestone powder, silica sand, reemulsifiable powder resin, smectite type clay minerals and powder additives into the compsn. SOLUTION: This compsn. is obtd. by uniformly compounding 5 to 100 pts.wt. fine limestone powder having a Blaine's value of 1000 to 6000cm<2> /g, 6 to 300 pts.wt. silica sand, 2 to 46 pts.wt. reemulsifiable powder resin consisting of a vinyl acetate resin powder and 0.5 to 20 pts.wt. smectite type clay minerals or 0.5 to 45 pts.wt. silica fume as well as 0.1 to 10 pts.wt. water reducing agent, 0.01 to 2 pts.wt. defaming agent, 0.01 to 3.0 pts.wt. extender and, if necessary, 0.5 to 50 pts.wt. shrinkage reducing agent and 10 to 200 pts.wt. hardening accelerator as the powder additives with 100 pts.wt. cement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-powder type polymer cement composition for use on semi-flexible pavement of roads.

[0002]

2. Description of the Related Art Semi-flexible pavement, also called semi-rigid pavement, is a pavement having both the flexibility of asphalt pavement and the rigidity of concrete pavement. This semi-flexible pavement requires fluid resistance, oil resistance, heat resistance, light color, etc.For example, intersections of roads where vehicles are frequently braked, stopped, started, bus stops, highways Toll booth,
Used for gas stations. The construction of the semi-flexible pavement is performed by paving an open asphalt mixture having a large porosity of about 20 to 27% as a base material, and then infiltrating cement milk for infiltration into the open asphalt mixture as grout. The curing time until the opening of traffic after infiltration is about 3 days when using ordinary Portland cement as cement, and about 1 day when using early-strength Portland cement. It takes about 3 hours in the case of using a material to which a hardener is added. This cement milk for infiltration is added to a powder of cement, silica sand or the like while stirring a mixed solution of water-based resin emulsion or rubber latex and water at a construction site in advance, and uniformly kneaded by a mixer.

[0003]

In the above-mentioned construction method, not only takes time to prepare several or more kinds of materials to prepare the cement milk for infiltration, but also if there is immature workers, there is a possibility that mixing errors may occur. there were. There was also a problem with the treatment of waste cans after use of the resin emulsion. Further, when preparing the cement milk for infiltration, the powder is liable to generate dust, resulting in deterioration of the working environment.

[0004] An object of the present invention is to provide a compound which can be quickly prepared at a construction site, and has an adverse effect on the construction of cement cement for infiltration even when using ordinary or early-strength Portland cement in which cement is added with ultra-rapid hardening cement or rapidly hardening material. It is an object of the present invention to provide a one-powder type polymer cement composition for semi-flexible pavement capable of minimizing the amount of water. It is another object of the present invention to provide a one-powder type polymer cement composition for semi-flexible pavement, which does not cause a mixing mistake by an operator.

It is another object of the present invention to provide a semi-flexible, one-powder type polymer cement composition for paving which reduces the bleeding rate of cement milk for infiltration. Another object of the present invention is to improve the fluidity of the cement milk for infiltration, reduce the water powder ratio to reduce the drying shrinkage, thereby suppressing the occurrence of cracks, and the semi-flexibility excellent in strength development. An object of the present invention is to provide a one-powder type polymer cement composition for paving. Still another object of the present invention is to provide a one-powder type semi-flexible polymer cement composition for pavement, which prevents scattering of dust when preparing cement milk for infiltration and improves the working environment.

[0006]

The invention according to claim 1 is
A one-powder type polymer cement composition for semi-flexible pavement prepared by uniformly mixing cement, limestone fine powder, silica sand, re-emulsifiable powder resin, smectite-type clay mineral and powder additive in a predetermined ratio. is there. By using the limestone fine powder, the fluidity of the cement milk for infiltration is improved, and the water powder ratio for obtaining a desired flow value can be reduced,
As a result, drying shrinkage can be reduced, and the occurrence of cracks can be suppressed. Also, by using smectite type clay mineral,
Bleeding of the cement milk for infiltration can be suppressed while maintaining good fluidity.

According to a second aspect of the present invention, there is provided a semi-flexible pavement prepared by uniformly mixing cement, limestone fine powder, silica sand, re-emulsifiable powder resin, silica fume and powder additives at a predetermined ratio. It is a one-powder type polymer cement composition. By using silica fume, the strength expression is improved while maintaining good fluidity.

[0008] A third aspect of the present invention is a semi-flexible pavement powder prepared by uniformly mixing cement, silica sand, a re-emulsifiable powder resin, a shrinkage reducing agent, and a powder additive at a predetermined ratio. It is a type polymer cement composition. The invention according to claim 4 is a semi-flexible pavement prepared by uniformly mixing cement, limestone fine powder, silica sand, a re-emulsifiable powder resin, a shrinkage reducing agent and a powder additive at a predetermined ratio. It is a powder type polymer cement composition. The invention according to claim 5 is a semi-deflection prepared by uniformly mixing cement, fast-hardening material, limestone fine powder, silica sand, re-emulsifiable powder resin, shrinkage reducing agent and powder additive at a predetermined ratio. It is a one-powder type polymer cement composition for conductive pavement. In the invention according to any one of claims 3 to 5, the use of the shrinkage reducing agent reduces the drying shrinkage of the cement milk for infiltration, thereby suppressing the occurrence of cracks.
In addition, scattering of dust during preparation of the cement milk for infiltration is prevented, and the working environment is improved. By using fast-hardened material,
Curing time until opening of traffic can be shortened.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The polymer cement composition according to claim 1 is 5 to 10 parts by weight based on 100 parts by weight of cement.
0 parts by weight of limestone fine powder, 6 to 300 parts by weight of silica sand, 2 to 46 parts by weight of re-emulsifiable powder resin, 0.5 to 2 parts by weight
Contains 0 parts by weight of smectite-type clay mineral. The polymer cement composition according to claim 2 is characterized in that, based on 100 parts by weight of cement, 5 to 100 parts by weight of limestone fine powder;
It contains 200 parts by weight of silica sand, 2 to 25 parts by weight of a re-emulsifiable powder resin, and 0.5 to 45 parts by weight of silica fume. The polymer cement composition according to claim 3 has 100
5 to 150 parts by weight of silica sand, 1 to 20 parts by weight of re-emulsifiable powder resin,
0 parts by weight of a shrinkage reducing agent. The polymer cement composition according to claim 4, wherein 5 to 100 parts by weight of limestone fine powder, 6 to 300 parts by weight of silica sand, and 2 to 46 parts by weight of re-emulsifiable powder are used for 100 parts by weight of cement. Body resin,
It contains 0.5 to 20 parts by weight of a shrinkage reducing agent. The polymer cement composition according to claim 5, comprising 100 to 100 parts by weight of cement, 10 to 200 parts by weight of a fast-setting material, and 5 to 100 parts by weight.
Parts by weight of limestone fine powder, 10 to 600 parts by weight of silica sand, 1 to 100 parts by weight of re-emulsifiable powder resin,
50 parts by weight of a shrinkage reducing agent.

The preferred content of the fine limestone powder is 20 to 60 parts by weight in the case of claims 1, 2 and 4, and 10 to 40 parts by weight in the case of claim 5. The preferred content of quartz sand is
25 to 100 parts by weight in the case of claims 1, 2 and 4, 20 to 80 parts by weight in the case of claim 3, 50 to 15 parts in the case of claim 5
0 parts by weight. The preferable content of the re-emulsifiable powder resin is 1.5 to 15 parts by weight in claims 1, 2 and 5, 1.0 to 10 parts by weight in claim 3, and 2 to 5 in claim 5.
40 parts by weight. The preferred content of the smectite-type clay mineral of claim 1 is 1 to 10 parts by weight. The preferred content of the silica fume of claim 2 is 1 to 15 parts by weight. The preferable content of the shrinkage reducing agent is as follows.
5 to 5 parts by weight, 1 to 8 parts by weight in the case of claim 4, and 1 to 15 parts by weight in the case of claim 5. The preferred content of the quick-hardening material of claim 5 is 15 to 100 parts by weight.

If the limestone fine powder is less than the above lower limit, good fluidity cannot be obtained, and if it exceeds the above upper limit, there is a problem that strength developability is reduced. If the silica sand is less than the above lower limit, desired fluidity cannot be obtained, and if the silica sand exceeds the above upper limit, there occurs a problem that the strength developability is reduced. If the re-emulsifiable powder resin is less than the above lower limit, cracks are liable to occur, and if it exceeds the above upper limit, strength developability is reduced, resulting in uneconomical problems. If the smectite-type clay mineral is less than the above lower limit, a sufficient bleeding suppressing effect cannot be obtained, and if it exceeds the above upper limit, a problem that the fluidity is reduced occurs. If the silica fume is less than the above lower limit, no sufficient effect on strength development can be obtained, and if the silica fume exceeds the above upper limit, the viscosity increases and the fluidity decreases. When the shrinkage reducing agent is less than the above lower limit, the effect is not exhibited, and when the shrinkage reducing agent exceeds the above upper limit, there is a problem that the curing is adversely affected. If the fast-hardened material is less than the lower limit, a sufficient quick-hardening effect cannot be obtained, and if it exceeds the upper limit, a problem of premature curing occurs.

Each material will be described in detail through the polymer cement compositions according to the first to fifth aspects. As the cement of the present invention, normal Portland cement, early-strength Portland cement, mixed cement, and ultra-rapid hardening cement are used according to the curing time required to open the traffic.
These may be used in combination. A rapid hardening material may be added to ordinary or early-strength Portland cement to be used as an ultra-fast setting cement. In the case of using ultra-rapid hardening cement, the injection operation can be ensured by using a setting modifier such as oxycarboxylic acid or a salt thereof, an alkali metal salt, an aluminate or a sulfate. For fast-setting cement, 20 to 70 parts by weight of Portland cement or mixed cement
II-type anhydrous gypsum 10-30 parts by weight, steelmaking slag 20-50 parts by weight and setting retarder 0.5-5 based on the total weight of these components
A mixture of the fine powder mixture and Portland cement or mixed cement in the above ratio was added to the mixture by adding the above parts by weight to obtain a specific surface area of 3500 cm ² / g.
10-70 parts by weight of stainless steel slag produced by the use of aluminum in the deoxidation step of the stainless steel refining process, and 100 parts by weight of Portland cement or mixed cement described in JP-A-260749), and type II anhydrous gypsum After mixing 4 to 40 parts by weight with 0.5 to 5 parts by weight of an organic setting retarder such as tartaric acid and a setting modifier consisting of an alkali carbonate such as sodium carbonate, the mixture is pulverized (Japanese Patent Laid-Open No. No. 6-321607) or a commercially available calcium aluminate-based quick-setting material can be used.

The smectite type clay mineral of the present invention includes bentonite, montmorillonite, beidellite,
Nontronite, saponite, iron saponite, hectorite, and the like. The quartz sand of the present invention is foundry sand, sea sand,
Either river sand or mountain sand may be used. A relatively fine silica sand of about No. 7 is preferable. Examples of the re-emulsifiable powder resin of the present invention include a commercially available vinyl acetate resin powder. For example, resin powders of ethylene vinyl acetate resin, carboxylic acid-modified vinyl acetate resin, veova-modified vinyl acetate resin, acetic acid acrylate copolymer, pure acrylic resin, and the like can be given. The limestone fine powder has a Blaine value (specific surface area) of 10
00-6000 cm ² / g, preferably 2000-45
A powder of 00 cm ² / g is used. Further, as the shrinkage reducing agent, one having a particle size of 0.6 mm or less, preferably 0.3 mm or less is used.

The powder additive of the present invention includes a powdery water reducing agent, a defoaming agent, and a thickener. The polymer cement composition according to any one of claims 1 to 5, wherein the composition contains 0.1 to 10 parts by weight of a water reducing agent and 0.01 to 2 parts by weight of a defoaming agent based on 100 parts by weight of cement. Parts and a thickener are contained in an amount of 0.01 to 3.0 parts by weight. Below these lower limits, the desired performance of each does not appear, and when it exceeds the upper limit, in the case of a water reducing agent, material separation and curing delay occur,
In the case of an antifoaming agent, curing delay may occur, and in the case of a thickener, curing delay may occur and fluidity may be reduced. Examples of the water reducing agent include lignin sulfonate, oxyorganic acid salt, β-naphthalene sulfonate, polycarboxylate, melamine resin sulfonate, creosote oil sulfonate condensate and the like. As powder defoamers, ethers, fatty acid esters, fatty acid amides, higher alcohols,
Examples include highly polymerized glycols and silicones. Among them, nonionic or silicone is preferred. Examples of the thickener include cellulose derivatives such as hydroxyethylcellulose, methylcellulose, and humanoxymethylcellulose. Examples of the shrinkage reducing agent include liquid glycol ether, low molecular ethylene oxide, propylene oxide copolymer, polyether, alkylene oxide adduct of lower alcohol, and powdered neopentyl glycol.

In order to prepare the one-powder type polymer cement composition of the present invention, each material is dry-mixed by a usual powder mixing apparatus such as a V-type mixer, a vertical mixer, a universal mixer and the like. When a liquid shrinkage reducing agent is used, the shrinkage reducing agent is added and mixed in advance to silica sand and limestone fine powder, and the mixture is dry-mixed with cement, a re-emulsifiable powder resin and the like. Further, the construction of the semi-flexible pavement using the one-powder type polymer cement composition of the present invention is carried out by paving the base particle size asphalt mixture,
20 to 60 parts by weight of water, preferably 25 parts by weight,
Approximately 50 parts by weight are mixed with a mobile mixer or the like to prepare a cement milk for penetration (grout). After the paved open-grain asphalt mixture has a temperature of 50 ° C. or less, the cement milk (grout) for infiltration is sprayed, spread with a rubber lake, and penetrated into the open-grain asphalt mixture with a vibrating roller.

[0016]

Next, examples of the present invention will be described together with comparative examples. <Example 1> 35 parts by weight of a fine limestone powder having a Blaine value of 3000 cm ² / g and 40 parts by weight of silica sand No. 7 were collected in a container of a universal mixer with respect to 100 parts by weight of ordinary Portland cement, and the stirring blade was used. Attach and first agitate at low speed for 10 minutes. Subsequently, 4 parts by weight of an acrylic copolymer resin powder as a re-emulsifiable powder resin, 6 parts by weight of bentonite as a smectite type clay mineral, and a high-performance water reducing agent (melamine resin sulfonic acid condensate salt) as a powder additive. )
0.9 parts by weight, 0.1 parts by weight of a powder defoamer (nonionic) and 0.02 parts by weight of a thickener (hydroxyethylcellulose) are added, and the mixture is stirred and mixed at a high stirring speed for 20 minutes. A one-powder type polymer cement composition for flexible pavement was prepared and placed in a closed container.

<Example 2> A one-powder type polymer cement composition for semi-flexible pavement was prepared in the same manner as in Example 1 except that 7 parts by weight of silica fume was collected instead of 6 parts by weight of bentonite. This was placed in a closed container.

<Comparative Example 1> A thickener (hydroxyethylcellulose) was added at 0.02 without adding bentonite at all.
A semi-flexible one-powder type polymer cement composition for pavement was prepared in the same manner as in Example 1 except that the amount was increased from 0.1 parts by weight to 0.10 parts by weight, and this was placed in a closed container. <Comparative Example 2> A one-powder type polymer cement composition for semi-flexible pavement was prepared in the same manner as in Example 1 except that bentonite was not added at all, and was placed in a closed container.

Example 3 29 parts by weight of silica sand No. 7 and 2 parts by weight of a liquid glycol ether as a shrinkage reducing agent were collected in a container of a universal mixer, and a stirring blade was attached thereto, and the mixture was first stirred at low speed for 10 minutes. . Subsequently, 100 parts by weight of ordinary Portland cement, 3 parts by weight of an acrylic copolymer resin powder as a re-emulsifiable powder resin, and a high-performance water reducing agent (melamine resin sulfonic acid condensate salt) as a powder additive were added to the container.
5 parts by weight were added and the mixture was stirred and mixed for 20 minutes at a high stirring speed to prepare a one-powder type polymer cement composition for semi-flexible pavement, which was placed in a closed container. <Comparative Example 3> A one-powder type polymer cement composition for semi-flexible pavement was prepared in the same manner as in Example 3 except that no shrinkage reducing agent was added, and this was placed in a closed container.

Example 4 40 parts by weight of silica sand No. 7, 40 parts by weight of limestone fine powder having a Blaine value of 3000 cm ² / g, and 1 part by weight of liquid glycol ether as a shrinkage reducing agent were placed in a container of a universal mixer. Collect, attach stirring blades,
The mixture was first stirred at low speed for 10 minutes. Subsequently, 100 parts by weight of ordinary Portland cement, 4 parts by weight of an acrylic copolymer resin powder as a re-emulsifiable powder resin, and a high-performance water reducing agent (melamine resin sulfonate condensate salt) as a powder additive were added to the container. 9 parts by weight and 0.02 parts by weight of a thickener (hydroxyethyl cellulose) were added, and the stirring speed was increased to 2 parts.
The mixture was stirred and mixed for 0 minute to prepare a one-powder type polymer cement composition for semi-flexible pavement, which was placed in a closed container. <Comparative Example 4> A one-powder type polymer cement composition for semi-flexible pavement was prepared in the same manner as in Example 4 except that no shrinkage reducing agent was added, and this was placed in a closed container.

Example 5 A one-powder type polymer cement composition for semiflexible pavement was prepared in the same manner as in Example 4 except that the amount of the shrinkage reducing agent was increased from 1 part by weight to 2 parts by weight. This was placed in a closed container.

Example 6 A one-powder type polymer cement composition for semi-flexible pavement was prepared in the same manner as in Example 4 except that the amount of the shrinkage reducing agent was increased from 1 part by weight to 4 parts by weight. This was placed in a closed container.

<Example 7> Of the components of the quick-setting cement described above, a component added to Portland cement or mixed cement was used as a quick-setting material (Mitsubishi Materials Corporation, trade name:
45% by weight of this fast-hardened material in Example 5.
In addition to the above components, a one-powder type polymer cement composition for semi-flexible pavement was prepared in the same manner as in Example 5 except that no high-performance water reducing agent and thickener were added as powder additives. Placed in closed container. <Comparative Example 5> A one-powder type polymer cement composition for semi-flexible pavement was prepared in the same manner as in Example 7 except that no shrinkage reducing agent was added, and was placed in a closed container. Example 1
Table 1 shows the composition of Comparative Examples 1 to 7 and Comparative Examples 1 to 5.

[0024]

[Table 1]

<Dust scattering resistance test of one-powder type polymer cement composition> A certain amount of one-powder type polymer cement of Examples 4 to 6 and Comparative Example 4 was blown at a constant crosswind of 4 m in wind speed. Each of the compositions is dropped from a predetermined height, and is leeward from the drop point in a direction of 20 to 60 cm, 60 to 1 cm.
Containers (pads) for receiving the scattered powder were placed at positions separated by 00 cm and 100 to 140 cm, and the amount of powder contained in each container was measured. Table 2 shows the values (percentage) of Examples 4 to 6 when the weight of Comparative Example 4 is 100, as the degree of scattering.

[0026]

[Table 2]

As is clear from Table 2, it was found that the one-powder type polymer cement compositions of Examples 4 to 6 produced less dust and scatter than Comparative Example 4.

<Kneading of grout> Examples 1, 2, 4 to 7
In addition, 100 parts by weight of the one-powder type polymer cement composition for semi-flexible pavement of Comparative Examples 1, 2, 4, 5 and 5 were added to 45 parts by weight of water, respectively. 100 parts by weight of the one-powder type polymer cement composition is added to 50 parts by weight of water, and each is uniformly mixed with a mixer to obtain 1 part.
Two types of cement milk for penetration (grout) were prepared.

<Physical Properties of Grout and Specimen> (a) Fluidity (Flow) Test Standards of the Japan Society of Civil Engineers “Testing method for fluidity of mortar poured into prepacked concrete (method using P funnel) (JSCE-
F521-1994) ". That is, the grout immediately after kneading obtained from the one-powder type polymer cement compositions of Examples 1 to 7 and Comparative Examples 1 to 5 and the grout after elapse of 20 minutes after kneading were placed in a funnel vertically supported. , And the flow value of each was determined, and its liquidity was evaluated. Table 3 shows the results. (b) Bleeding test According to the provisions of JSCE-F522-1994, grout immediately after kneading obtained from the one-powder type polymer cement composition of Example 1 and Comparative Examples 1 and 2 was collected and its bleeding rate was measured. Table 3 shows the results.

(C) Strength Test and Measurement of Drying Shrinkage “Physical test method of cement (JIS R 5201-19)
92)). That is, the grout immediately after kneading obtained from the one-powder type polymer cement compositions obtained in Examples 1 to 6 and Comparative Examples 1 to 4 had a cross section of 40 mm square and a length of 16 mm.
A specimen having a prism of 0 mm was prepared. The specimen age is 24
At times 3, 7 and 28 days, three specimens were measured for flexural strength and compressive strength. Similarly, the same specimen was prepared from the grout immediately after kneading obtained from the one-powder type polymer cement composition of Example 7 and Comparative Example 5. When the age of the specimens was 3 hours, 24 hours, 3 days, 7 days, and 28 days, three specimens of each specimen were measured for bending strength and compressive strength. Examples 3 to 7 and Comparative Examples 3 to
For No. 5, the drying shrinkage was determined from the dimensional change from the start of drying when the drying period of the specimen was 4 weeks according to JIS A 1129-1993 “Test method for length change of mortar and concrete”. Table 3 shows the average value.

[0031]

[Table 3]

The following was found from Table 3. In contrast to Example 1 in which bentonite was not added and the amount of the thickener was not increased, the bleeding rate was 0%, which was good and the fluidity did not decrease. In Comparative Example 1, a clear bleeding rate was obtained even when the thickener was increased. Not only was not observed, but also the fluidity was significantly reduced. Further, in Example 2 in which silica fume was added, both the bending strength and the compressive strength were increased as compared with Comparative Example 2 in which silica fume was not added. Examples 3 to 7 in which the shrinkage reducing agent was added were compared with Comparative Examples 3 to 5 in which no shrinkage reducing agent was added, that is, Example 3 was compared with Comparative Example 3, and Examples 4 to 6 were Comparative Example 4. In comparison, Example 7 had a reduced drying shrinkage rate as compared with Comparative Example 5.

[0033]

As described above, according to the present invention, it is possible to mix quickly at the construction site, and even when using ordinary or early-strength Portland cement in which cement is added with ultra-rapid hardening cement or rapidly hardening material, Adverse effects on the construction of cement milk can be minimized. Also, even if the worker is immature, there is no possibility of mis-mixing. In addition, the bleeding rate of the cement milk for infiltration can be reduced, the fluidity is excellent, the drying shrinkage can be reduced by lowering the water powder ratio, and the strength expression is excellent. Further, the drying shrinkage of the cement milk for infiltration can be reduced, whereby the occurrence of cracks can be suppressed, and the scattering of dust at the time of construction can be prevented.

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Claims (5)

[Claims] 1. One-powder type semi-flexible pavement prepared by uniformly mixing cement, limestone fine powder, silica sand, re-emulsifiable powder resin, smectite-type clay mineral and powder additive in a predetermined ratio. Polymer cement composition. 2. A one-powder type polymer cement composition for semi-flexible pavement prepared by uniformly mixing cement, limestone fine powder, silica sand, re-emulsifiable powder resin, silica fume and powder additives in a predetermined ratio. Stuff. 3. A one-powder type polymer cement composition for a semi-flexible pavement prepared by uniformly mixing a cement, silica sand, a re-emulsifiable powder resin, a shrinkage reducing agent and a powder additive at a predetermined ratio. 4. A single-powder polymer for semi-flexible pavement prepared by uniformly mixing cement, limestone fine powder, silica sand, re-emulsifiable powder resin, shrinkage reducing agent and powder additive in a predetermined ratio. Cement composition. 5. A semi-flexible pavement prepared by uniformly mixing cement, fast-hardening material, fine limestone powder, silica sand, re-emulsifiable powder resin, shrinkage reducing agent and powder additives in a predetermined ratio. One-powder type polymer cement composition.