JP6025167B2 - Concrete floor slab asphalt pavement repair method and polymer cement mortar - Google Patents

Description

  The present invention relates to a method for repairing a concrete floor slab asphalt pavement surface and a polymer cement mortar used for the repair.

  The paved road surface (hereinafter referred to as “concrete floor slab asphalt pavement surface” in the present invention) in which an asphalt layer is laminated on the upper surface of a concrete floor slab is widely used on expressways, general motorways, boardwalks, parking lots, runways, etc. It is used. A waterproof layer or an adhesive layer may be provided between the concrete floor slab and the asphalt layer. Reinforced concrete is often used as the concrete floor slab. Moreover, the steel slab may be equipped with the steel plate on the lower surface.

  The concrete floor slab asphalt pavement surface may be partially deteriorated, and many cracks may be locally generated in the asphalt layer. When water enters the crack, the asphalt bond strength is reduced, the asphalt layer is partially broken, and a depression called a pothole is generated. Furthermore, many cracks (cracks) occur locally in the concrete below the asphalt layer, and when water enters the cracks, the cement component at the top of the concrete slab is liberated and becomes gravel, or the reinforcing bars in the concrete slab May corrode. If such a partial deterioration of the concrete floor slab asphalt pavement surface is left unattended, there is a problem that the usable period is shortened and the safety of a passing vehicle or the like cannot be maintained.

  For this reason, it has been performed to remove a deteriorated portion and fill a recess (concave portion) formed by the removal with a repair material. As the repair material, a modified asphalt emulsion mixture containing aggregates and fibers and heated (for example, refer to Patent Document 1), a single-grain coarse aggregate is coated with asphalt, and the surface is coated with asphalt-coated sand. Room temperature composite (for example, see Patent Document 2), specially modified asphalt emulsion mainly composed of thermosetting resin and asphalt emulsion, admixture mainly composed of cement, aggregate, filler, or water A pavement surface repair material (for example, see Patent Document 3) obtained by mixing the above is known. In some cases, steel fiber reinforced concrete (SFRC) using super fast cement as a binder is used as a repair material for concrete slabs (see, for example, Patent Document 4).

JP 2003-105713 A Japanese Patent Publication No. 06-056002 JP 2008-196145 A Japanese Patent Laid-Open No. 08-003918

  The repair materials according to the prior art have the following problems.

  The repair material of patent document 1 and patent document 2 is a repair material which has asphalt the main component of the binder, and is used for repair of an asphalt layer. If the concrete slab is also deteriorated, if the concrete floor slab depression formed by removing the deteriorated part is filled with only the repair material mainly composed of asphalt, the repair part will be the concrete strength of the concrete slab. There is a problem that the repaired portion becomes a weak point because the strength is low compared to.

  In addition, since the repair material of Patent Document 3 uses a thermosetting resin as a binder, a large amount of heat is generated, such as when heat generation during curing is large and the concrete slab has deteriorated to the upper part (repair) Not suitable for repair (thick material and large volume). That is, there is a possibility that a new empty wall may be formed by heat shrinkage.

  In addition, the repair material of Patent Document 4 is SFRC using ultra-high speed hard cement (hereinafter referred to as “super-high speed SFRC”), and is included in the ultra-high speed SFRC because it shrinks greatly due to drying and the like and is easily neutralized quickly. Steel fibers and concrete slabs that are easily corroded are easily corroded, and even when used for repairing potholes, there is a problem that they are easily deteriorated.

  Furthermore, since the ultrafast SFRC hardens immediately, there is a problem that sufficient filling time cannot be secured and workability is lacking.

  Considering the above problems, filling with a new repair material has been studied. The new repair material has a problem of satisfying fluidity and difficulty of material separation in an appropriate range and ensuring sufficient adhesion strength.

  The present invention solves the above problems and provides a method for repairing a partially deteriorated concrete floor slab asphalt pavement surface, which can be applied even when the concrete floor slab is deteriorated, and a polymer cement mortar used for the repair. The purpose is to do.

The present invention for solving the above problems is a method for repairing a deteriorated portion of a concrete floor slab asphalt pavement surface in which an asphalt layer is laminated on the upper surface of the concrete floor slab, wherein the asphalt layer at the deteriorated portion and a lower layer of the asphalt layer are provided. A step (A) of removing concrete and forming a depression in the concrete floor slab, and a depression of the concrete floor slab formed by the step (A), a rapid hardening cement, a cement polymer, fine aggregate and water A step (B) of containing a polymer cement mortar containing and containing a unit polymer amount of 50 to 150 kg / m ³ , a water cement ratio of 26 to 35%, and a polymer cement ratio of 10 to 30%; and the step (B) And a step (C) of laminating an asphalt layer on the upper surface of the polymer cement mortar filled with It is a method of repairing over door deck asphalt pavement.

  The polymer cement mortar thus configured is excellent in filling property and adhesion strength, and can be applied even when the concrete slab is deteriorated.

  In the present invention, preferably, the fine aggregate is a content ratio of particles having a particle diameter of 0.15 to 0.30 mm, a content ratio of particles having a particle diameter of 0.30 to 0.60 mm, and a particle diameter of 0.60 to 1. .18 mm particle content and 1.18 to 2.36 mm particle content are both 10% by mass or more, and the particle size is 0.15 mm or less and exceeds 2.36 mm. The particle content is less than 5% by mass.

  Thereby, even if it is a construction location with a slope, smoothness can be ensured.

  In the present invention, preferably, the polymer cement mortar contains fine aggregate in an amount such that the fine aggregate cement ratio is 1.0 to 4.0.

The present invention for solving the above-mentioned problems is a mortar used for repairing a concrete floor slab asphalt pavement surface, which contains a rapid hardening cement, a polymer for cement, fine aggregate and water, and a unit polymer amount is 50 to 150 kg / m. ^3. A polymer cement mortar having a water cement ratio of 26 to 35% and a polymer cement ratio of 10 to 30%.

  The repair material (polymer cement mortar) and the repair method of the present invention are applicable even when the concrete slab is deteriorated. Thereby, the concrete floor slab asphalt pavement surface partially degraded can be repaired.

Process drawing of repair method for concrete floor slab asphalt pavement surface of this embodiment

~ Polymer cement mortar composition ~
The polymer cement mortar used in the present embodiment contains a quick-hardening cement, a cement polymer, fine aggregate, and water, the unit polymer amount is 50 to 150 kg / m ³ (50 or more and 150 or less), and the water cement ratio is 26. It is a fast-curing polymer cement mortar having a polymer cement ratio of 10% to 30% (10 to 30 or less).

  Examples of the quick-hardening cement include Portland cement or Eco-cement, or one or two or more kinds of cement selected from a mixed cement obtained by mixing pozzolanic powder such as silica fume and fly ash, blast furnace slag powder, etc., calcium aluminate, etc. Examples thereof include those obtained by adding a quick setting agent (material) including a rapid hardening agent (material), and ultra-fast hardening cement marketed under a trade name such as “jet cement” or “super jet cement”.

As the quick setting agent (material) used here, the quick setting agent (material) whose main component is calcined alnite, the quick setting agent (material) whose main component is sodium aluminate, and calcium aluminate as the main component. Examples of preferred calcium aluminates include calcium aluminate, calcium haloaluminate, calcium sodium aluminate, calcium sulfoaluminate, and SiO ₂ , K ₂ O, One type or two or more types selected from the group consisting of Fe ₂ O ₃ , TiO _{2 and the} like in a solid solution or combination can be used. These calcium aluminates may be compounds, solid solutions, vitreous, or those in which two or more of these coexist. Moreover, an alumina cement can also be used as a quick setting agent (material) mainly composed of calcium aluminates. Moreover, two or more types of quick setting agents (materials) may be used in combination.

  As the polymer for cement, any polymer may be used as long as it is used as a binder for polymer cement mortar or polymer cement concrete. For example, styrene / butadiene copolymer, chloroprene rubber, acrylonitrile / butadiene copolymer or methyl methacrylate / butadiene copolymer. Synthetic rubber such as coalescence, natural rubber, polyolefin such as polyethylene and polypropylene, polychloropyrene, polyacrylic acid ester, styrene / acrylic copolymer, all acrylic copolymer, polyvinyl acetate, vinyl acetate / acrylic copolymer, acetic acid Vinyl / acrylic acid ester copolymer, modified vinyl acetate, ethylene / vinyl acetate copolymer, ethylene / vinyl acetate / vinyl chloride copolymer, vinyl acetate vinyl versatate copolymer, acrylic / vinyl acetate / veova Trade name of vinyl t-decanoate) Vinyl acetate resins such as copolymers, unsaturated polyester resins, polyurethane resins, alkyd resins, epoxy resins and other synthetic resins, bitumens such as asphalt, rubber asphalt and paraffin are preferred. Examples are given, and one or more of these can be used.

  Because of its good adhesion to concrete floor slabs and asphalt layers, the polymers for cement include polyvinyl acetate, vinyl acetate / acrylic copolymer, vinyl acetate / acrylic acid ester copolymer, modified vinyl acetate, ethylene / acetic acid Vinyl acetate resins such as vinyl copolymer, ethylene / vinyl acetate / vinyl chloride copolymer, vinyl acetate vinyl versatate copolymer, acrylic / vinyl acetate / veova (trade name of vinyl t-decanoate) ; Acrylic resins such as polyacrylic acid ester, polymethacrylic acid ester, acrylic acid ester / styrene copolymer, styrene / acrylic copolymer, all acrylic copolymer; polyolefin resin such as polyethylene and polypropylene; styrene / butadiene Copolymer, chloroprene rubber, acrylonitrile It is preferable to use one or more selected from synthetic rubbers such as butadiene copolymer or a methyl methacrylate-butadiene copolymer.

  The state of the polymer for cement used in the present invention may be any of a liquid, an emulsion, or a re-emulsifying powder resin in which an emulsion is powdered.

(Unit polymer amount)
The content of the polymer for cement in the polymer cement mortar is such that the unit polymer amount is 50 to 150 kg / m ³ and the polymer cement ratio is 10 to 30% in terms of non-volatile content at 105 ° C. (hereinafter referred to as “solid content”). .

If the unit polymer amount is less than 50 kg / m ³ , the adhesion strength is insufficient. On the other hand, if the unit polymer amount exceeds 150 kg / m ³ , the viscosity of the polymer cement mortar becomes too high, and therefore it is difficult to perform the filling operation. The unit polymer amount is preferably 50 to 150 kg / m ^{3 in} terms of solid content, more preferably 80 to 130 kg / m ^3, and more preferably 85 to 126 kg / m ³ , for reasons of good adhesion strength and filling properties. More preferably.

(Water cement ratio)
The polymer cement mortar contains water in an amount that is 26 to 35% of the water cement ratio. When adding an aqueous liquid admixture (for example, an admixture aqueous solution or an emulsion cement polymer), consider the amount of water contained in the aqueous liquid admixture added to the polymer cement mortar. To do. If the water cement ratio is less than 26%, the fluidity is low, so the workability is poor and the adhesion strength is insufficient, and if it exceeds 35%, material separation is likely to occur and the adhesion strength is insufficient. The water cement ratio of the polymer cement mortar is preferably set to 26 to 32% because it is excellent in fluidity, hardly causes material separation, and provides high adhesion strength.

(Polymer cement ratio)
As described above, the polymer cement ratio (mass ratio) is set to 10 to 30%. If the polymer cement ratio is less than 10%, the adhesion strength of the polymer cement mortar tends to be insufficient, and if the polymer cement ratio exceeds 30%, the viscosity of the polymer cement mortar becomes too high, and therefore it is difficult to perform the filling operation. For reasons of good adhesion strength and fillability, the polymer cement ratio is preferably 10 to 30%, more preferably 12 to 30%, and more preferably 12.5 to 27% in terms of solid content. Is more preferable.

(Fine aggregate particle size distribution)
Examples of fine aggregates contained in polymer cement mortar include crushed sand, land sand, river sand, sea sand, artificial fine aggregate, cement clinker granules (grains coarser than cement clinker powder commercially available as cement), slag Fine aggregates and the like are listed as preferred examples.

  In fine aggregate, the content of particles having a particle size of 0.15 to 0.30 mm, the content of particles having a particle size of 0.30 to 0.60 mm, the content of particles having a particle size of 0.60 to 1.18 mm, and The content rate of particles having a particle size of 1.18 to 2.36 mm is 10% by mass or more and 60% by mass or less, and the content rate of particles having a particle size of 0.15 mm or less and the content of particles exceeding 2.36 mm. It is preferable that all the rates are less than 5% by mass. In addition, the particle | grains with a particle size of 0.15 mm or less and / or the particle | grains exceeding 2.36 mm do not need to be contained in the fine aggregate.

  With such a fine aggregate particle size distribution, the surface of the polymer cement mortar can be smoothly adjusted according to the inclination of the surrounding road surface (inclination of the upper surface of the surrounding concrete floor slab). That is, it is preferable because an inclined concrete floor slab can be repaired so that there is no missing portion.

  Here, particles having a particle size of 0.15 to 0.30 mm refer to particles that remain on a sieve having a nominal aperture of 0.15 mm and pass through a sieve having a nominal aperture of 0.30 mm (exceeding 0.15 mm). 0.30 mm or less). The particles having a particle size of 0.30 to 0.60 mm refer to particles that remain on the sieve having a nominal opening of 0.30 mm and pass through the sieve having a nominal opening of 0.60 mm. The particles having a particle size of 0.60 to 1.18 mm refer to particles that remain on the sieve having a nominal opening of 0.60 mm and pass through the sieve having a nominal opening of 1.18 mm. Moreover, the particle | grains with a particle size of 1.18-2.36 mm say the particle | grains which remain on a sieve with a nominal opening of 1.18 mm, and pass a sieve with a nominal opening of 2.36 mm. Moreover, the particle | grains with a particle size of 0.15 mm or less say the particle | grains which pass a sieve with a nominal opening 0.15mm. Moreover, the particle | grains exceeding 2.36 mm means the particle | grains which remain on a sieve with a nominal opening of 2.36 mm.

(Fine aggregate cement ratio)
The amount of fine aggregate contained in the polymer cement mortar preferably contains fine aggregate in such an amount that the fine aggregate ratio is 1.0 to 4.0. The fine aggregate cement ratio is a mass ratio (S / C) obtained by dividing the mass (S) of the fine aggregate contained by the mass (C) of the contained cement.

  If the fine aggregate cement ratio is less than 1.0, the drying shrinkage of the polymer cement mortar increases after a long period of time, so that there is no adhesion to the concrete floor slab or the like which becomes the base, and there is a risk of peeling. When the fine aggregate cement ratio exceeds 4.0, the fluidity of the polymer cement mortar is lowered, so that the adhesion strength may be insufficient. The fine aggregate cement ratio is preferably 1.0 to 4.0, more preferably 1.5 to 3.2, because peeling due to drying shrinkage hardly occurs and fluidity is good.

(Flow value)
The flow value (flow value after 15 drop motions, hereinafter referred to as “JIS flow value”) specified in JIS A 1171 “Test method for polymer cement mortar” of polymer cement mortar is 130 to 200. preferable. When it is 130 or more, the filling operation is easy to perform, and the adhesion strength is increased. If it is less than 130, the filling operation becomes difficult due to a decrease in fluidity, and the adhesion strength is insufficient. On the other hand, even when repairing an inclined road surface with a JIS flow value of 200 or less, the surface of the polymer cement mortar filled in the depression is inclined to the surrounding road surface (inclination of the upper surface of the surrounding concrete floor slab). It can be arranged smoothly. That is, the concrete floor slab can be repaired so that there is no missing part. If the road surface is inclined when the JIS flow value exceeds 200, it cannot be smoothed. The JIS flow value is preferably 130 to 200, more preferably 135 to 180, because the adhesion strength and filling properties are good and smoothness can be ensured even when the road surface is inclined.

  The polymer cement mortar preferably has a flow value (hereinafter referred to as “drawing flow value”) of 105 to 150 before the drop motion immediately after the flow cone before the JIS flow value measurement is drawn. When it is 105 or more, the back side of the reinforcing bar (lower part) is provided even when the polymer cement mortar is not vibrated by the vibrator during filling when the filling recess is formed by removing even the concrete of the back side part of the reinforcing bar inherent in the concrete slab. The side) can be filled without any unfilled parts. If it is less than 105, the fluidity is low and the filling operation becomes difficult, and the adhesion strength is also insufficient. On the other hand, even when repairing an inclined road surface with an extraction flow value of 150 or less, the surface of the polymer cement mortar filled in the depression is inclined to the surrounding road surface (inclination of the upper surface of the surrounding concrete slab). It can be arranged smoothly. That is, the concrete floor slab can be repaired so that there is no missing part. When the drawing flow value exceeds 150, when the road surface is inclined, it cannot be smoothed. The drawing flow value is preferably 105 to 150, and the drawing flow value is 105 to 140 because the adhesion strength and filling properties are good and smoothness can be ensured even when the road surface is inclined. And more preferred.

(Other admixtures)
In addition to rapid-hardening cement, cement polymer, fine aggregate and water, polymer cement mortar may be used in combination with one or more of other admixtures or coarse aggregates as long as the effects of the present invention are not impaired. it can. Examples of such admixture materials include cement dispersants such as high-performance water reducing agents and high-performance AE water reducing agents, setting retarders, foaming agents, foaming agents, waterproofing agents (agents), rust preventives, shrinkage reducing agents, Pozzolanes such as thickeners, pigments, antifoaming agents, expansion materials, fibers, water repellents, white-fade inhibitors, curing accelerators (materials), strength accelerators (materials), blast furnace slag fine powder, fly ash and silica fume Examples thereof include powder, stone powder, and a surface hardener. Use of glass fiber, metal fiber and organic fiber in combination is preferable because it has an effect of preventing scattering of the polymer cement mortar. When glass fiber is used in combination, the amount is preferably 2.0% by volume or less, more preferably 0.1 to 1.0% by volume, based on the volume of the polymer cement mortar.

(About mixing)
The polymer cement mortar is manufactured by mixing each material. There are no particular limitations on the equipment and mixing apparatus used for mixing, but it is preferable to use a mixer because it can be mixed in a short amount of time. The mixer that can be used may be a continuous mixer or a batch mixer, such as a pan concrete mixer, a pug mill concrete mixer, a gravity concrete mixer, a grout mixer, a hand mixer, and a plaster mixer.

~repair~
A repair method according to an embodiment of the present application is a repair method for a deteriorated portion of a concrete floor slab asphalt pavement road surface in which an asphalt layer is laminated on an upper surface of a concrete floor slab, wherein the asphalt layer in the deteriorated portion and the concrete below the asphalt layer A step of forming a depression in the concrete floor slab, and the depression of the concrete floor slab formed by the A step contains rapid hardening cement, polymer for cement, fine aggregate and water, and unit polymer amount There 50~150kg / ^{m 3,} water cement ratio is 26 to 35%, and step B in which the polymer cement ratio to fill the polymer cement mortar is 10-30%, the asphalt layer on the top surface of the polymer cement mortar filled with process B And a C step of stacking layers.

  FIG. 1 is a process diagram of a method for repairing a concrete floor slab asphalt pavement surface according to the present embodiment.

  (A) of FIG. 1 is a schematic sectional drawing of the concrete floor slab asphalt pavement surface before repair. Cracks 6 are generated in the asphalt layer 5 and the waterproof material layer 4 on the upper part of the concrete floor slab 1, and a part of the asphalt layer 5 is broken to form a pot hole 8. Furthermore, many cracks (cracks) are generated locally on the upper part of the concrete floor slab, and when water enters the crack, the cement component on the upper part of the concrete 3 is released and becomes gravel, or the rebar 2 in the concrete slab is corroded. Sometimes. Moreover, the concrete deposit 7 may precipitate through a crack.

  FIG. 1B is a schematic cross-sectional view relating to the A process. After removing some of the healthy parts around the deteriorated part of the concrete floor slab asphalt pavement surface (concrete floor slab 1, asphalt layer 5 and waterproof material layer 4), the asphalt layer 5 and waterproof material with a diamond cutter are removed. A recess 9 is formed in the upper part of the concrete floor slab 1 by cutting with the layer 4 and scraping it off with a concrete hammer including the upper part of the concrete floor slab 1.

  A process (removal process) is not limited to the said method. As a suitable removal method, a method of cutting with a diamond cutter or a wire saw, a method of scraping with a concrete breaker such as a concrete hammer, a hole or a groove provided on a road surface is filled with a crushing agent such as a static crushing agent, etc. A method of crushing by pressure, a method of driving and crushing wedges or the like in holes or grooves provided on the road surface, a method of scraping with a road surface cutting machine or a paved road surface cutting leveling machine, a method of scraping by blasting a blast material against a road surface like sandblast , A method of cutting or scraping using a water jet, or a method of using two or more of these together.

  The part to be removed in the removal process varies depending on the degree and range (area, depth) of the road surface deterioration, but a part of the surrounding healthy part can also be removed so that the deteriorated part does not remain. preferable. When removing the asphalt layer 5 and the concrete 3 on the top surface of the concrete floor slab 1, when removing the asphalt layer 5 and the concrete 3 on the back side of the reinforcing steel bar 2 from the top surface of the concrete floor slab 1, When removing all the concrete slab 1 (so as to make a through-hole in the road surface), remove from the top of the asphalt layer 5 and the concrete slab 1 to the concrete 3 on the back side of the rebar 2 and the part of the exposed rebar 2 There is a case to do.

  When the removal area of the asphalt layer 5 is wider than the removal area of the concrete floor slab 1, that is, when the removal is performed so that the healthy upper surface of the concrete floor slab 1 is exposed, the surface of the filled polymer cement mortar 10 (described later) is removed. It is preferable because it can be finished with no difference in level from the upper surface of the surrounding concrete floor slab with a plate or a crease.

  FIG. 1C is a schematic cross-sectional view relating to the B process. Fill the depression 9 with the polymer cement mortar 10 and level the surface of the polymer cement mortar 10 driven into the depression 9 with a scissors so that the height is substantially the same as the healthy upper surface of the concrete slab 1 around the depression 9. .

  B process (filling process) is not limited to the said method. Preferable examples include a method of applying with a scissors or a brush, a method of spraying using a spraying machine, a method of pumping using a mortar pump or a concrete placer, a method of driving using a chute, a bucket or a unicycle Examples include a method of transporting to the upper part or the side of the recess and driving it into the recess 9 and a method of using two or more of these in combination.

  Further, in the filling process, the ridges, plates, bars, finishers, dampers, road rollers, compactors are formed so as to be substantially the same height as the healthy upper surface of the concrete slab 1 around the depression 9, that is, so as not to cause a step. It is preferable to level the surface of the polymer cement mortar that has been driven into the recess by float or the like.

  Further, in the filling step, it is preferable to use a vibrator because unfilled portions are easily lost when vibration is applied to the polymer cement mortar with a vibrator.

  FIG. 1D is a schematic cross-sectional view relating to the C process. A waterproof material layer 11 is formed by applying a waterproof material to the upper surface of the polymer cement mortar 10, and a new asphalt layer 12 is laminated and laid on the upper surface of the waterproof material layer 11.

In addition, in FIG. 1, although the waterproof material layer 11 is formed in the upper surface of the polymer cement mortar 10, it suppresses deterioration of the concrete floor slab asphalt pavement surface after repair, especially a concrete floor slab, forming a waterproof material layer 11 can be omitted.

  The asphalt layer 12 laminated on the upper surface of the polymer cement mortar 10 in the step C (asphalt laying step) is formed by an asphalt mixture using asphalt as a binder. Furthermore, cement paste (cement milk) may be filled in the voids of the asphalt mixture.

  As the asphalt mixture, asphalt may be used as a binder, and one or two or more binders selected from cement, thermoplastic resin, and thermosetting resin may be used in combination as the binder. In addition to binders, fillers such as limestone powder, igneous rock powder, slaked lime, fly ash, aggregates such as fine aggregates and coarse aggregates, additive materials such as peeling inhibitors and fiber reinforcements, etc. should be used. it can. As the asphalt, natural asphalt, modified asphalt, paving petroleum asphalt, asphalt emulsion, cutback asphalt, and the like can be used.

  As the asphalt mixture, asphalt mortar or asphalt concrete mixed with aggregate is preferable because of its high shape stability.

  The C process (asphalt laying process) is not limited to the above method, and may be appropriately selected according to the material to be used. At this time, by using a kite, a plate, a rod, a finisher, a damper, a road roller, a compactor, a float, etc., so that it is almost the same height as the healthy upper surface of the asphalt layer 5 around the depression, that is, no step is generated. It is preferable to level the surface of the asphalt mixture 12.

~ Performance evaluation test ~
A performance evaluation test of a polymer cement mortar (Example) satisfying various conditions of the present embodiment was performed. For comparison, a polymer cement mortar that does not satisfy only the conditions related to fine aggregate particle size distribution is used as a semi-example, and polymer cement that does not satisfy any one or more of the unit polymer amount, water cement ratio, and polymer cement ratio. A performance evaluation test was conducted using mortar as a comparative example.

  12800 g of polymer cement mortar having the blending ratio shown in Table 1 was prepared. Compound No. 1-4 and No.1. Examples 9 to 11 are examples. Nos. 5 to 8 are comparative examples. 12 to 14 are quasi examples.

In production, each material was put in a metal cylindrical container (capacity: 18 L), and then mixed for 90 seconds with a hand mixer (rotation speed: 300 rpm). The materials used at this time are shown below. The specimen preparation and kneading were all performed at 20 ° C., and the test was performed after the temperature of the material used was set to 20 ° C.
Cement: Super fast cement (trade name “Super Jet Cement”, Taiheiyo Cement Co., Ltd.)
(Unit cement amount: C)
Polymer for cement: Ethylene / vinyl acetate copolymer emulsion (manufactured by Taiheiyo Material Co., Ltd., nonvolatile content; 45 mass%) (unit polymer content (solid content conversion): P)
Glass fiber: fiber length: 10 mm, fiber diameter: 14 μm
Fine Aggregate: Mixed sand produced by conducting screening tests on multiple commercially available fine aggregates (silica sand) according to JIS A 1102 “Aggregate Screening Test Method”, and mixing multiple silica sands based on the results. (Silica sand A to silica sand F) (particle size distribution is shown in Table 2)
Water: Tap water (Unit water volume: W)

  The performance evaluation test was conducted on a consistency test, a coating test, and an adhesion strength test.

(Consistency test)
According to the flow test prescribed in JIS A 5201-1171 “Cement physical test method”, the flow value immediately after kneading (flow value after 15 drop motions, JIS flow value) was measured. In addition, the flow value (dropping flow value) before the drop motion immediately after the flow cone was pulled out was measured. The results are shown in Table 3.

  Examples (NO. 1-4, 9-11) and quasi-examples (NO. 12-14) all satisfy the range of draw flow values 105-150 and meet the range of JIS flow values 130-200. . On the other hand, Comparative Example (No. 5, 6) has too low fluidity, and Comparative Example (No. 7, 8) has too high fluidity.

(Application test)
A concrete flat plate (length 1000 × width 1000 × thickness 100 mm) having a depression (length 500 × width 500 × depth 40 mm) was produced. In this recess, two D19 rebars were arranged in the vertical direction (cover thickness 30 mm, rebar spacing 200 mm) and one in the horizontal direction (cover thickness 30 + 19 mm). The produced polymer cement mortar was driven into a depression in a concrete plate, and a test specimen was produced by leveling with a hammer so that the height was substantially the same as the concrete plate around the depression.

  The test specimens were prepared by placing a concrete flat plate horizontally and placing a vibration on the polymer cement mortar with a vibrator (gradient 0%, with vibration), and placing a concrete flat plate with a gradient 8% and placing it on the polymer cement mortar with a vibrator. Vibration added (gradient 8%, with vibration), concrete plate placed horizontally with no vibration by the vibrator when driven (gradient 0%, no vibration), concrete plate placed with a gradient 8%, vibrator when driven Smoothness was confirmed for each of the four levels (slope 8%, no vibration).

  Further, seven days after the polymer cement mortar was driven, the specimen was cut with a diamond cutter, and the filling state (fillability) of the polymer cement mortar was confirmed.

  The results of the coating test are shown in Table 4. The evaluation of smoothness and fillability at this time was as follows.

[Smoothness]
○: The polymer cement mortar could be smoothed.
X: The polymer cement mortar could not be smoothed.
[Fillability]
○: The polymer cement mortar could be filled.
X: The polymer cement mortar could not be filled.

  All the examples (NO. 1 to 4, 9 to 11) satisfy both smoothness and filling properties. In addition, although the fine aggregate particle size distribution of an Example (NO.1-4) is the same, the particle size distribution of an Example (NO.9-11) is different, respectively.

  The quasi-examples (NO. 12 to 14) satisfy the filling property, but do not satisfy the smoothness when there is an inclined gradient.

  The comparative examples (Nos. 5 to 8) do not satisfy the smoothness when there is an inclination, and do not satisfy the filling property except for a part.

(Adhesion strength test)
The adhesion strength test was conducted after 7 days from the injection of polymer cement mortar.
The test was carried out in accordance with A 171 “Test method for polymer cement mortar”.

The results of the adhesion strength test are shown in Table 5. The evaluation of the adhesion test was as follows. In addition, in order to use it as a cross-section restoration material on an expressway managed by each company of NEXCO, an adhesion strength with concrete is required to be 1.5 N / mm ² or more.
○: Adhesion strength 1.5 N / mm ² or more ×: Adhesion strength 1.5 N / mm ^{2 or} less

  The examples (NO. 1 to 4, 9 to 11) and the quasi examples (NO. 12 to 14) satisfy the predetermined adhesion strength, but the comparative examples (No. 5 to 8) have the predetermined adhesion strength. Do not meet.

(Comprehensive evaluation)
In Examples (NO. 1 to 4, 9 to 11), in the coating test and the adhesion strength test, the test level in which the test body was horizontally installed when the polymer cement mortar was put in the filling property, the integrity (adhesion), and the coating test. Smoothness of (gradient 0%), excellent performance in any of the test level smoothness in which the specimen was installed with a slope of 8% when polymer cement mortar was applied in the application test, and the overall evaluation was “◯” (pass) Met.

  The quasi-examples (NO. 12 to 14) exhibited excellent performance except for the test level of smoothness in which the specimen was installed with a gradient of 8% when the polymer cement mortar was placed in the coating test. That is, it can be applied sufficiently in horizontal construction locations.

  The comparative examples (Nos. 5 to 8) included “x” (defective) in any item, and the overall evaluation was also “x” (failed).

~effect~
The polymer cement mortar of the present embodiment is applicable even when the concrete slab has deteriorated. Thereby, the concrete floor slab asphalt pavement surface partially degraded can be repaired. The polymer cement mortar of the present embodiment improves workability because it takes a sufficient time for filling work. Further, high strength can be obtained in a relatively short time, and road traffic regulation time can be shortened.

1 Concrete floor slab 2 Reinforcing bar 3 Concrete 4 Waterproof material layer 5 Asphalt layer (asphalt concrete)
6 Crack 7 Precipitate of cement component 8 Pothole 9 Depression 10 Polymer cement mortar 11 Waterproof material layer 12 Asphalt layer (asphalt concrete)

Claims (4)

A method for repairing a deteriorated portion of a concrete floor slab asphalt pavement surface in which an asphalt layer is laminated on an upper surface of a concrete floor slab,
Removing the asphalt layer of the deteriorated portion and the concrete below the asphalt layer, and forming a recess in the concrete floor slab (A);
The depression of the concrete floor slab formed by the step (A) contains a quick-hardening cement, a polymer for cement, fine aggregate and water, the unit polymer amount is 50 to 150 kg / m ³ , and the water cement ratio is 26 to Filling the polymer cement mortar with 35% and polymer cement ratio of 10-30% (B);
And a step (C) of laminating an asphalt layer on the upper surface of the polymer cement mortar filled in the step (B). A method for repairing a concrete floor slab asphalt pavement surface. The fine aggregate has a particle content of 0.15 to 0.30 mm, a particle content of 0.30 to 0.60 mm, and a particle content of 0.60 to 1.18 mm. And the content of particles having a particle size of 1.18 to 2.36 mm is 10% by mass or more, and the content of particles having a particle size of 0.15 mm or less and the content of particles having a particle size of more than 2.36 mm are both It is less than 5 mass%, The repair method of the concrete floor slab asphalt pavement surface of Claim 1 characterized by the above-mentioned. The polymer cement mortar, as claimed in claim 1 or claim 2 concrete deck asphalt pavement surface according to, characterized in that an amount of the fine aggregate to fine aggregate cement ratio is 1.0 to 4.0 Repair method. When repairing the concrete floor slab asphalt pavement surface, a mortar that fills the depression formed in the concrete floor slab located under the asphalt layer of the degraded part ,
Contains quick-setting cement, cement polymer, fine aggregate and water,
A polymer cement mortar having a unit polymer amount of 50 to 150 kg / m ³ , a water cement ratio of 26 to 35%, and a polymer cement ratio of 10 to 30%.

Images