JP3263741B2 - Polymer / asphalt modified cement mortar composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement mortar composition and, more particularly, to a polymer-asphalt-modified cement mortar composition suitable as a repair material for asphalt-paved roads.

[0002]

2. Description of the Related Art As materials suitable for repairing worn roads and cracks / defects in concrete buildings, repair materials using organic binders such as asphalt and various polymers are known. . These are advantageous in that they have better adhesion to asphalt, concrete, and the like than ordinary cement mortar, and are relatively widely used.

However, there are drawbacks such as the strength of the repaired portion does not become too high and the abrasion resistance after curing is not so good. Therefore, when repairing over a relatively wide range in a place where a large dynamic load is applied, such as a road, etc. Is not enough.
In addition, in order to ensure adhesiveness, it is necessary to thoroughly dry the repaired part before repairing, so if used outdoors, the weather will determine whether repair work is possible. There is a disadvantage that.

[0004] Therefore, attempts have been made to improve adhesion by blending various admixtures with cement mortar.
For example, it is known that cement mortar containing a polymer dispersion or cement mortar containing an asphalt emulsion has high adhesiveness.

[0005] These are excellent in workability as compared with those using the above-mentioned organic binder, but the admixture rather slows down the setting speed of the cement, and the final development strength of the repaired portion. However, there was a problem that the number was relatively low in many cases.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cement mortar which is hardened at room temperature and has good workability, in addition to its adhesiveness with asphalt materials and concrete.
In particular, it is an object of the present invention to provide a cement mortar composition having good physical properties such as flexural strength after curing, compressive strength, impact resistance and friction resistance.

[0007]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, as a blending agent to be added to cement mortar, a polymer dispersion and a specific asphalt emulsion at a specific ratio. The present inventors have found that the physical properties after curing are remarkably improved by using the same, and completed the present invention.

That is, the present invention relates to a polymer / asphalt-modified cement mortar composition comprising a hydraulic cement, an aggregate, a polymer dispersion and a nonionic asphalt emulsion.
The amount of the aggregate was 340 to 420 parts by weight, the amount of the solid (A) converted to the solid content of the polymer dispersion was 10 to 60 parts by weight, and the amount of the solid was converted to the solid content of the nonionic asphalt emulsion. The blending amount (B) is 5 to 60 parts by weight, and the ratio of A to B (A / B) is 15/85 to 90
/ 10. The present invention relates to a polymer-asphalt-modified cement mortar composition, wherein the ratio is / 10.

Hereinafter, the present invention will be described in detail.

[0010] The hydraulic cement used in the present invention is an inorganic powder which is hardened by a hydration reaction in the presence of water. Specifically, ordinary portland cement, early-strength portland cement, and ultra-high-strength portland cement are used. Portland cement, fly ash, etc.
Various portland cement-based mixed cements (for example, fly ash cement, silica cement, blast furnace cement, etc.), admixtures such as siliceous admixtures, blast furnace slag, etc., alumina cements, and various quick-setting cements can be given. . Considering the curing time after application and the effects of the present invention, those having excellent strength development characteristics in a short period of time, such as early-strength Portland cement and ultra-high-strength Portland cement, are preferred.

The mortar composition of the present invention is obtained by mixing a specific amount of aggregate, a polymer dispersion and a specific asphalt emulsion with hydraulic cement, and the compounding amount of the aggregate is 100 parts by weight of hydraulic cement. 340-42
It is about 0 parts by weight, preferably about 360 to 400 parts by weight. If the amount of the aggregate is out of the above range, the denseness of the mortar composition is impaired, the workability is deteriorated, and the physical properties after curing are also deteriorated.

Regarding the type of aggregate used in the present invention,
There is no particular limitation, as long as the maximum particle size is about 25 mm or less, it is applicable, and those generally used in the field of civil engineering and construction can be used.

When the mortar composition of the present invention is used for repairing a road surface, when the aggregate containing a relatively large particle size is blended, when the vehicle travels repeatedly in the repaired portion, the aggregate portion and the surrounding portion are not removed. There is a problem that a step is easily generated between the connecting member and the road surface, and the smoothness of the road surface is impaired to cause vibration of the running vehicle. Therefore, the smoothness of the road surface, that is, the stable running of the vehicle is ensured. From the viewpoint of physical properties after curing, it is preferable to use fine aggregate having a maximum particle size of 5 mm or less. In consideration of the influence of the particle size distribution of the aggregate on the physical strength and abrasion resistance after curing, it is preferable to mix and use materials having different particle sizes as appropriate.

The polymer dispersion referred to in the present invention is obtained by dispersing various polymers in an aqueous medium. In the present invention, there is no particular limitation, and any known polymer can be used. Specifically, a rubber latex containing, as a polymer, at least one rubber selected from acrylonitrile butadiene rubber, styrene butadiene rubber, chloroprene rubber, butyl rubber, urethane rubber, methyl methacrylate butadiene rubber, recycled rubber, and natural rubber. Or, a resin emulsion containing at least one resin selected from vinyl acetate resin, acrylate resin, vinylidene chloride resin, vinyl chloride resin, vinyl propionate resin, ethylene vinyl acetate resin, propylene resin, and the like. it can. These may be used alone or in combination of two or more.

The polymer dispersion used in the present invention is not particularly limited, but may be a rubber latex containing styrene butadiene rubber or an acrylate resin, an ethylene vinyl acetate resin, a vinyl chloride resin, and a vinylidene chloride resin. Thermoplastic resin emulsions containing at least one polymer selected from the group consisting of the following are preferred, and those having a solid content of about 30 to 70% by weight, preferably about 40 to 60% by weight are particularly suitable.

The asphalt emulsion referred to in the present invention is an oil-in-water emulsion containing natural asphalt or petroleum asphalt. In the present invention, the asphalt is finely divided in an aqueous medium containing a nonionic surfactant. Use a nonionic asphalt emulsion emulsified in water.

The asphalt used here is preferably petroleum asphalt, and among them, relatively soft asphalt is preferable. Specific examples of the nonionic surfactant include polyoxyethylene alkylphenol ether and other various substances commonly used in this field. In the present invention, a known nonionic asphalt emulsion can be appropriately used.

The asphalt emulsion used in the present invention is not particularly limited, but has a solid content of 40%.
About 70% by weight, preferably about 50 to 65% by weight.

When an anionic asphalt emulsion using an anionic surfactant or a cationic asphalt emulsion using a cationic surfactant is used instead of the nonionic asphalt emulsion, the adhesiveness of the mortar composition is reduced. Or, physical properties after curing are reduced.

In the mortar composition of the present invention, the blending amount (A) of the polymer dispersion in terms of solids, the blending amount (B) of the nonionic asphalt emulsion in terms of solids, and the ratio (A / B) is characterized in that A is 10 to 60 parts by weight, preferably 30 to 50 parts by weight, B is 5 to 60 parts by weight, preferably 20 to 40 parts by weight with respect to 100 parts by weight of hydraulic cement, Ratio A / B of A / B
B is 15/85 to 90/10, preferably 40/60 to 9
0/10.

When the content of A or B is too large, especially when A / B is out of the above range, physical properties such as flexural strength and compressive strength of the mortar composition after curing are rapidly lowered. On the other hand, if the content of A is too small, the adhesiveness decreases.

In addition, the mortar composition of the present invention contains water derived from the polymer dispersion and the asphalt emulsion, which contributes to the hydration reaction of the cement. May be blended. In any case, the preferable amount of water in the mortar composition is 30 to 100 parts by weight based on 100 parts by weight of cement.
It is about 40 parts by weight, preferably about 40 to 70 parts by weight.

If necessary, a fibrous reinforcing material such as asbestos, rock wool, glass fiber, carbon fiber and the like can be blended.

The mortar composition of the present invention can be produced by appropriately blending and kneading hydraulic cement, aggregate, polymer dispersion and asphalt emulsion according to a known method.

Although not particularly limited, a mixture of solid raw materials such as hydraulic cement and aggregate and a mixture of liquid raw materials such as polymer dispersion and asphalt emulsion are separately provided. It is preferable to manufacture both of them and mix them with a kneading machine because a uniform product can be easily manufactured. In addition, as a kneading machine,
A known device such as a Henschel mixer can be used.

The mortar composition of the present invention can be applied to various uses in which ordinary cement mortar is used.
Particularly, due to its adhesiveness and physical properties after curing, it is suitable as a repair material for worn or lost roads.

[0027]

The mortar composition of the present invention has excellent adhesion to asphalt materials and concrete, and excellent physical properties after curing. And since it contains hydraulic cement, it can be applied even when the substrate is wet. In addition, since it cures at room temperature or outside temperature, it is not necessary to heat it during construction and it is simple.

[0028]

【Example】

Examples 1 to 5 and Comparative Examples 1 to 6 100 parts by weight of early strength Portland cement [manufactured by Osaka Cement Co., Ltd., trade name: Lion High Set W-60]
And 380 parts by weight of mixed aggregate (100 parts by weight of Kashima silica sand 3A, 100 parts by weight of No. 4 silica sand, 100 parts by weight of No. 5 silica sand, 50 parts by weight of No. 6 silica sand and 30 parts by weight of No. 7 silica sand A polymer dispersion containing acrylic acid ester as a main component (manufactured by Konishi Co., Ltd., trade name: Bond CAT303, solid content: 50% by weight), and a nonionic asphalt emulsion [Shinreki] Product name: Soil set, manufactured by Kogyo Co., Ltd.
(Solid content: 57% by weight) was added at a ratio shown in Table 1 and 125 parts by weight of the mixture were added and mixed and stirred.

With respect to the obtained mortar composition, bending strength, compressive strength, impact strength,
A test for abrasion resistance and adhesion strength was performed.

The results are shown in Tables 1, 2 and 3. In addition,
In these tables, A represents the solid content equivalent of the polymer dispersion, and B represents the solid content equivalent of the asphalt emulsion.

[Test Method] (1) Flexural strength and compressive strength In accordance with JIS A-1172 "Test method for strength of polymer cement mortar". As the test piece, a cured product having a size of 4 × 4 × 16 cm obtained by filling a mortar composition into a mold and allowing it to stand and cure for one week in a room (normal temperature) was used.

(2) Impact strength An ordinary flat plate of 300 × 300 × 60 mm (JIS A
-5304 "Pavement concrete plate"), using a mortar composition to form a smooth surface layer with a mortar composition on a surface using a gold trowel and allowing it to cure for one week indoors (normal temperature). The sample obtained by was used as a specimen.

A specimen with the surface layer facing upward was placed horizontally on a sandy ground, and the inner diameter was 100 mm × height 1 at the center of the surface layer.
Vertically stand a 000 mm rigid PVC pipe made of rigid PVC, and measure the diameter 6 from the height of 1000 mm from the surface layer.
A steel ball having a diameter of 4 mm and a mass of 1045 g was passed through the guide pipe and dropped repeatedly at the same point on the surface layer, and the number of drops of the steel ball until the first crack was observed on the surface layer was measured.

(3) Abrasion resistance The method was based on JIS A-1453, "Method of testing wear of building materials and building components (abrasive paper method)" (commonly called Taber method). The test conditions were as follows: wear wheel: CS-17, load: 500 gr, rotation speed: 500 rotations.

(4) Adhesive strength A surface layer of a mortar composition having a thickness of 5 mm and a smooth surface is formed on a surface of an asphalt concrete plate having a size of 300 × 300 × 60 mm using a gold trowel, ) Was used for one week.

Using a disk cutter, a cut having a depth of 4 × 4 cm reaching the base concrete from the surface layer side is formed, and a portion surrounded by the cut has a size of 4 × 4 cm.
A 10 mm thick steel pulling jig is attached using an epoxy resin adhesive, and after the adhesive has hardened, the jig is connected to a pulling frame device and is vertically moved until it is broken by the operation of a hydraulic pump. A tensile load was applied, and the maximum load at break was measured (commonly known as Kenken-type adhesive strength test).

The measured maximum load was applied to the adhesion area (16c
The value divided by m ² ) was taken as the adhesive strength. In addition, when the fracture | rupture part of the test body was observed, in any case, it was internal destruction of the surface layer (mortar composition hardened | cured material) itself.

[0038]

[Table 1]

[0039]

[Table 2]

[0040]

[Table 3]

Example 6 On a road modeled on a concrete road in a factory premises where vehicles such as trucks, wagons, passenger cars, and factory lifts frequently run (in a zone where no outsiders can enter the applicant's factory) The mortar composition of the present invention was quickly poured into a wadachi (width 30 cm × depth 50 mm) and a defective portion (diameter 30 cm × depth 15 cm), and the surface was immediately pressed horizontally with a gold trowel for repair.

Although it was a cold season in February, after about 30 minutes, it hardened sufficiently to withstand the load imposed by the vehicle.

When the vehicle was passed through the repaired road at a frequency equivalent to five months in the factory premises and the repaired portion was observed, no abnormalities such as cracks and floating from the lower layer were found at all. In a state that could withstand the passage of the air.

As the mortar composition, 100 parts by weight of early-strength Portland cement (manufactured by Osaka Cement Co., Ltd., trade name: Lion High Set W-60) is 38 parts.
0 parts by weight of the mixed aggregate (100 parts by weight of Kashima Keisanda 3A, 4 parts by weight)
A mixture of 100 parts by weight of No. 5 silica sand, 100 parts by weight of No. 5 silica sand, 50 parts by weight of No. 6 silica sand, and 30 parts by weight of No. 7 silica sand, and 87.5 containing an acrylate ester. A liquid mixture obtained by mixing 1 part by weight of a polymer dispersion (43.8 parts by weight on a solid basis) and 37.5 parts by weight of a nonionic asphalt emulsion (21.4 parts by weight on a solid basis) A / B: 43.8 / 21.4)
Was added and mixed and stirred.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C04B 24:36 C04B 24:36 14:06) 14:06) Z (72) Inventor Nobuyuki Asai Higashi Mikuni, Yodogawa-ku, Osaka-shi, Osaka 1-30-6-6 (72) Inventor Nobuhiko Wakano 1542-646 Tottori, Hannan-shi, Osaka (72) Inventor Koji Fukui 6-12 Ohira, Yamada-cho, Kita-ku, Kobe-shi, Hyogo (56) References JP, 50-50-12 (JP, A) JP, 3-37148, (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C04B 28/02-28/12 C04B 24/26 C04B 24/36

Claims (1)

(57) [Claims] 1. A polymer / asphalt-modified cement mortar composition comprising a hydraulic cement, an aggregate, a polymer dispersion and a nonionic asphalt emulsion, wherein the aggregate is added to 100 parts by weight of the hydraulic cement. Is 340 to 420 parts by weight, and the compounding amount (A) in terms of the solid content of the polymer dispersion is 10 to 60.
Parts by weight, the blending amount (B) in terms of the solid content of the nonionic asphalt emulsion is 5 to 60 parts by weight, and the ratio of A to B (A / B) is 15/85 to 90/10. A polymer / asphalt-modified cement mortar composition, comprising: