JP2017133272A - Injection material for water retentive pavement and water retentive pavement body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection material and a water retentive pavement body of using the injection material, for reducing a generation quantity of dust after service while having high water absorption ratio.SOLUTION: In an injection material for water retentive pavement, the injection material includes a fast-curing material and a water retentive material with cement as a base material, in which the water absorption ratio is 50% or more, compressive strength of material age 3-hours is 5.0 N/mmor more, and desirably, the compressive strength is 5.4 N/mmor more, and in a water retentive pavement body, an abrasion quantity by abrasion of load reciprocation of 500 times with the material age 3-hours of including the injection material of 105 N is 1000 g/mor less, a dust quantity is 40CPM or less, and desirably, the abrasion quantity is 600 g/mor less, and a dust quantity is 15CPM or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an injection material used for water retention pavement having a high water absorption rate and excellent wear resistance, and a water retention pavement filled with the injection material.

  Water-retaining pavement is a pavement in which the water gap of the pavement is filled with water-retaining grout, and the retained water evaporates and clears the heat of vaporization in fine weather, thereby reducing the surface temperature of the pavement and reducing the pavement. It has a function of reducing heat radiation from the atmosphere to the atmosphere, and can improve the thermal environment around the pavement and mitigate the heat island phenomenon.

  The water-retaining pavement is formed, for example, by filling a void in the porous asphalt mixture layer with a water-retaining material, or by mixing or filling a porous concrete with a water-retaining material. As the water retaining material, for example, porous calcium carbonate or the like (Patent Document 1), or non-fired vermiculite, paper sludge fired ash, diatomaceous earth, or the like is used (Patent Document 2), and these water retaining materials are usually cement or the like. It is used as an injection material mixed with the binder.

Japanese Patent No. 4005759 Japanese Patent No. 4644561

  The water retention of the pavement is based on the water absorption rate of the injection material, and the water absorption rate of the injection material depends on the water retention rate of the water retention material. An injection material with a high water absorption rate is used to increase the water retention capacity of the pavement, but in general, an injection material with a high water absorption rate is slightly low in strength, so there is a lot of wear on the pavement surface after use of the pavement and a lot of dust is generated. Tend to. On the other hand, an injection material with high strength tends to have a slightly low water absorption rate, and there is a limit to increasing the water retention of the pavement.

  The present invention solves the above-mentioned problems in conventional water-retaining pavement injection materials, and has a high water absorption rate and a small amount of dust generated after service, and a water-retaining pavement using the injection material Provide the body.

The present invention relates to a water-retaining pavement injection material and a water-retaining pavement that have solved the above problems with the following configurations.
[1] Injection material for water-retaining pavement, which includes cemented base material, fast-hardening material and water-retaining material, has a water absorption of 50% or more, and has a compressive strength of 5.0 N / mm ^{2 at the} age of 3 hours. An injection material characterized by the above.
[2] The water retention pavement injection material according to the above [1], wherein the water retention material is a diatomaceous earth non-fluxed powder.
[3] 40 to 75 parts by mass of a fast-hardening material, 10 to 55 parts by mass of a water-retaining material composed of a diatomaceous earth non-fluxed additive powder, and 3.5 parts by mass or less of an admixture with respect to 100 parts by mass of cement [1] or the water-retaining pavement injection material described in [2] above.
[4] For 100 parts by mass of cement, 45 to 75 parts by mass of a fast-hardening material, 10 to 45 parts by mass of a water retention material composed of a diatomaceous earth non-flux-added fired powder, and an admixture of 3.5 parts by mass or less, The injection material according to any one of [1] to [3], which has a water absorption of 50% or more and a compressive strength of 5.4 N / mm ² or more at a material age of 3 hours.
[5] The water-retaining pavement injection material according to any one of [1] to [4] above, which contains a thickener in an amount of 150 to 600 mPa · s at a water / powder ratio of 90 to 100%. .
[6] The injection material described in [1] above is contained, the water absorption rate by the injection material is 50% or more, and the wear amount due to 500 cycles of 105N load reciprocation at a material age of 3 hours is 1000 g / m ² or less. And a water-retaining pavement characterized by having a dust amount of 40 CPM or less.
[7] In the above [6], the water absorption rate by the injection material is 50% or more, the wear amount due to wear of 500 N load reciprocating 500 times of 3 hours of age is 600 g / m ² or less, and the dust amount is 15 CPM or less. Water-retaining pavement to describe.

[Specific description]
The injecting material of the present invention is an injecting material for water-retaining pavement, which includes a fast-hardening material and a water-retaining material with cement as a base material, has a water absorption rate of 50% or more, and has a compressive strength of 5.0 N at a material age of 3 hours. / it is injection material, characterized in mm ² or more, preferably is compression strength 5.4 N / mm ² or more comprising a water absorption of 50% or more age of 3 hours water retention paving grout is there.

  The injection material of the present invention is based on a binder made of cement and quick-hardening material. As the cement, ordinary Portland cement, early-strength Portland cement, low heat Portland cement, Portland cement such as moderately hot Portland cement, or mixed cement such as blast furnace cement, fly ash cement, silica cement and the like can be used.

  The injection material of the present invention contains a fast-hardening material together with cement as a binder. As the quick-hardening material, a material mainly composed of calcium aluminate and gypsum can be used. Specifically, commercially available products such as trade name Coca Ace Super can be used. By containing the quick-hardening material, the curing of the pavement progresses quickly, and early traffic opening after construction becomes possible.

As for the quantity of the quick-hardening material contained in an injection material, 40-75 mass parts of quick-hardening materials are preferable with respect to 100 mass parts of cement. When the amount of the quick-hardening material is less than 40 parts by mass, the effect of the quick-hardening material is insufficient, and the compressive strength of the injection material is lowered. When the amount of the quick-hardening material is 40 parts by mass or more, an injection material having a compressive strength of 5.0 N / mm ² or more at 3 hours after curing can be obtained. In addition, since the injection material with a compressive strength of 5.4 N / mm < ² > or more can be obtained if the amount of fast-hardening material is 45 parts by mass or more, the content of fast-hardening material is more preferably 45 parts by mass or more. On the other hand, when the amount of the fast-hardening material exceeds 75 parts by mass, the compressive strength of the injecting material decreases again. Therefore, the amount of the fast-hardening material is preferably 40 to 75 parts by mass and more preferably 45 to 75 parts by mass with respect to 100 parts by mass of cement.

  The injection material of the present invention contains a water retention material, and the water absorption rate by the water retention material is 50% or more. If the water absorption is less than 50%, it is not suitable for the purpose of the present invention. The water retaining material is preferably a powder obtained by firing diatomaceous earth without adding a flux. For example, a diatomaceous earth fired powder having a particle diameter of 0.1 to 100 μm obtained by pulverizing natural diatomaceous earth and firing at 800 to 1200 ° C. without adding a flux may be used. The diatomaceous earth fired powder generally has a water retention rate of 150% to 220%.

  In addition, although the powder which added the flux to diatomaceous earth and was baked is known, this flux-added fired powder (A) has a thin glass film on the surface and has a slightly high water retention rate. When the injection material (A) is mixed with a binder composed of a fast-hardening material, the water absorption rate of the injection material (A) is an injection using a diatomaceous earth powder (B) fired without adding a flux. It tends to be slightly lower than the water absorption rate of the material (B). On the other hand, the water retention of the diatomaceous earth powder (B) fired without adding a flux is slightly lower than the water retention of the diatomaceous earth fired powder (A). When (B) is selected, the water absorption rate of the injection material (B) tends to be higher than the water absorption rate of the injection material (A). Accordingly, a diatomaceous earth fired powder to which no flux is added is preferable in order to obtain an injection material having a high water absorption rate.

  Patent Document 1 describes porous calcium carbonate as a water retention material, and Patent Document 2 describes vermiculite, paper sludge calcination ash, and the like as water retention materials. It is not necessary to use these as water retention materials, and they are not included as water retention materials.

  The amount of the water retaining material contained in the injection material is preferably 10 to 55 parts by mass of the water retaining material with respect to 100 parts by mass of the cement. If the water-retaining material content is less than 10 parts by mass, it is difficult to increase the water absorption rate of the injected material to 50% or more, and if it exceeds 55 parts by mass, the strength of the injected material decreases and the surface of the pavement is injected into the pavement. This is not preferable because the amount of wear increases. In order to further reduce the amount of wear on the surface of the pavement, the amount of the water retaining material contained in the injection material is preferably 45 parts by mass or less.

  The injection material of the present invention may contain an admixture. The admixture is a re-emulsifying powder resin, an antifoaming agent, slaked lime, a thickening agent, a setting modifier, and the like. The amount of the admixture contained in the injection material is preferably 3.5 parts by mass or less with respect to 100 parts by mass of cement. Even if the content of the admixture is more than 3.5 parts by mass, the effect of the admixture does not change much.

  The injection material of the present invention is preferably used in a slurry having a water / powder ratio of 90 to 100%. The water / powder ratio is a% value of the ratio of the amount of water (W) to the amount of powder (total amount of cement, quick-hardening material, water retention material and admixture). If the water / powder ratio is less than 90%, the fluidity of the pouring slurry becomes poor and it becomes difficult to fill the voids in the pavement. On the other hand, if the water / powder ratio exceeds 100%, the concentration of the binder in the infusate slurry decreases, making it difficult to obtain sufficient strength.

The injection material of the present invention preferably contains a thickener in an amount of a viscosity of 150 to 600 mPa · s in a slurry having a water / powder ratio of 90 to 100%. When the viscosity of the slurry is less than 150 mPa · s, the fluidity of the slurry is high, so that the binder (cement, rapid-hardening material) having a large specific gravity in the injecting material slurry tends to sink to the lower part of the pavement and easily cause material separation. . If the proportion of the binder at the bottom of the pavement increases and the proportion of the binder at the top of the pavement decreases, the strength of the upper layer of the pavement will decrease and become brittle. It becomes difficult to reduce the wear amount to 600 g / m ² or less in the test. On the other hand, when the viscosity of the injection material slurry is higher than 600 mPa · s, the fluidity of the slurry is poor, and it becomes difficult to uniformly fill the injection material into the voids of the pavement.

The injected material of the present invention has a compressive strength of 5.0 N / mm ² or more after 3 hours of age after curing. When the compressive strength of the injection material is less than 5.0 N / mm ^2, it is difficult to sufficiently suppress wear on the surface of the pavement filled with the injection material, and it is difficult to reduce the wear amount. By including 40 to 75 parts by mass of a fast-hardening material, 10 to 55 parts by mass of a water retention material made of a diatomaceous earth non-fluxed additive powder, and 3.5 parts by mass or less of an admixture with respect to 100 parts by mass of cement. An injection material having a rate of 50% or more and a compressive strength of 5.0 N / mm ² or more at a material age of 3 hours after curing can be obtained.

Moreover, the injection material of the present invention preferably has a water absorption of 50% or more and a compressive strength at a material age of 3 hours after curing is 5.4 N / mm ² or more. By containing 45 to 75 parts by mass of a fast-hardening material, 10 to 45 parts by mass of a water retention material made of a diatomaceous earth non-fluxed additive powder, and 3.5 parts by mass or less of an admixture with respect to 100 parts by mass of cement. An injection material having a rate of 50% or more and a compressive strength of 5.4 N / mm ² or more at a material age of 3 hours can be obtained.

By filling the voids of the pavement such as a porous asphalt mixture layer with the injection material of the present invention, it is possible to obtain a water-retaining pavement that has a high water absorption rate and little pavement surface wear. Specifically, a water-retaining pavement having a water absorption rate of 50% or more by the injected material, a wear amount of 500 N load reciprocating 500 times of 3 hours of age, 1000 g / m ² or less, and a dust amount of 40 CPM or less. Can be obtained. Furthermore, by using an injection material having a compressive strength of 5.4 N / mm ² or more at an age of 3 hours, a water-retaining pavement having an abrasion amount of 600 g / m ² or less and a dust amount of 15 CPM or less can be obtained.

  Since the injection material of the present invention has a high water absorption rate and a high compressive strength, by using it for a water-retaining pavement, the water retention effect is excellent, the wear amount of the pavement surface is small, and the amount of dust is greatly reduced. A water-retaining pavement can be obtained.

  In general, the amount of dust in a relatively clean room is 1 to 10 CPM, the amount of dust in a slightly crowded train is 10 to 30 CPM, and the amount of dust on a sidewalk on a busy road is 20 to 50 CPM. By using the material, the amount of dust in the water-retaining pavement can be suppressed to the amount of dust in a slightly mixed train.

Illustration of dust measurement test Illustration of material separation measurement test

Both examples of the present invention and comparative examples are shown below. The materials used are shown in Table 1.
(B) The water retention rate of the water retention material is as follows: 2.00 g of water retention material is placed in a triangular funnel with filter paper, the tip of the filter paper is immersed in water for 3 minutes, and the filter paper is pulled up from the water for 2 minutes. After placement, the mass of the filter paper was measured (Ws). Thereafter, the same operation was performed without adding the sample water retaining material, and the mass of the filter paper was measured (Wp). Based on these values (Ws) and (Wp), the water retention rate (H) was calculated by the following equation [1].
Water retention rate (H) = [Ws− (2.00 + Wp)] / 2.00 × 100 (%) ... [1]
(B) The water absorption rate of the injected material was measured in accordance with “Tokyo Waterworks Pavement (Roadway) Design and Construction Guidelines (Draft)” of the Tokyo Metropolitan Construction Bureau Road Management Department. The mass (W1) after 24 hours of water absorption after demolding and the mass (W0) after 48 hours of drying at 60 ° C. were measured and calculated by the following equation [2].
Water absorption (%) = (W1-W0) / W0 × 100 ... [2]
(C) The compressive strength of the injection material was measured at a material age of 3 hours in accordance with JIS R 5201.
(D) The viscosity of the injection material was measured using a Brookfield B-type rotational viscometer DV-E type.
(E) The amount of dust on the pavement (relative concentration CPM [Count Per Minute]), as shown in Fig. 1, the water-retaining pavement 1 with an age of 3 hours is installed inside the hood 2 and the upper surface of the pavement is It is an average value of counts measured with a laser dust meter 4 rubbed with a metal brush 3 (reciprocating 500 times at a load of 105 N) and placed at a height of 20 cm away from the upper surface of the pavement. The amount of wear of the pavement was measured by the weight reduction of the pavement due to the wear.

[Example 1]
Using the materials used in Table 1, an injection material was produced according to the formulation in Table 2. The compressive strength and water absorption rate of the injected material at the age of 3 hours were measured. The produced injection material was filled in an open-graded asphalt mixture (porosity 25%) to produce a pavement. The wear amount and dust amount of this pavement were measured. The results are shown in Table 2.
As shown in Table 2, the injected materials of Samples A1 to A13 using the water retention material H1 have a compressive strength of 3 hours of age of 5.0 N / mm ² or more and a water absorption rate of 50% or more. The water-retaining pavement filled with this injection material has an abrasion amount of 1000 g / m ² or less and a dust amount of 37 CPM or less, which has an excellent water retention effect and a small amount of dust. . In particular, the injection materials of Samples A1 to A11 have a compressive strength of 5.4 N / mm ² or more, the wear amount of the water-retaining pavement filled with this injection material is 600 g / m ² or less, and the dust amount is 15 CPM or less. Yes, with excellent water retention effect and much less dust.
On the other hand, the injection material of samples B1 to B3 using the water retaining material H2 has a high water absorption rate because the amount of the water retaining material is large in the sample B1, but the compressive strength is low. Therefore, the wear amount and the dust amount of the pavement are remarkably large. The amount of wear of the pavement is more than twice that of Samples A1 to A11, and the amount of dust is about 5 times. Moreover, since the injection material of samples B2 to B4 has a high compressive strength, the wear amount and dust amount of the pavement are small, but even if the amount of the water retention material H2 is large, the water absorption rate is less than 50%, and the water retention effect of the pavement. Is low. Moreover, the injection material of sample B5 has both low compressive strength and water absorption.

[Example 2]
Using the materials used in Table 1, an injection material was produced according to the formulation in Table 3. The water absorption and viscosity of the injection material were measured. The produced injecting material was filled in an open-graded asphalt mixture (porosity 25%) to produce a pavement, and the injectability and material separation were confirmed. Moreover, the abrasion amount and dust amount of the pavement were measured in the same manner as in Example 1 for the manufactured pavement. The results are shown in Table 3.
The injectability is judged by visual inspection, and it is easy to fill the pavement and is very good when filled uniformly (marked with ◎). Those accumulated on the upper surface were regarded as defective (x mark).
For material separation, as shown in FIG. 2, the Shore hardness of the upper part, center part, and lower part of the specimen (40 × 40 × 160 mm) was measured with a Shore hardness meter. If the viscosity is too low, material separation occurs, a weak layer is formed on the upper surface, the hardness is reduced, and the Shore hardness is reduced.
As shown in Table 3, the injection materials of Samples A3, A14, and A15 of the present invention have a water absorption rate of 50% or more and a sufficient water absorption rate, and the slurry has a viscosity of 150 mPa · s to 600 mPa · s. Therefore, the injectability is good, the shore hardness of the surface portion, upper portion, center portion, and lower portion of the pavement is approximate, and the material is not separated. In addition, the amount of wear and dust on the pavement is small. On the other hand, since the injection materials of comparative samples B6 and B7 have low viscosity, the injection property is good, but the shore hardness of the surface portion and the upper portion of the pavement is small, whereas the shore hardness of the lower portion is large, resulting in material separation. . Moreover, since the viscosity of a slurry is too high, the injection material of comparative sample B8 is inferior.

1-water-retaining pavement, 2-hood, 3-metal brush, 4-laser dust meter.

Claims (7)

An injection material for water-retaining pavement, which includes a cemented base material, a fast-hardening material and a water-retaining material, has a water absorption rate of 50% or more, and has a compressive strength of 5 N / mm ² or more at a material age of 3 hours. An injection material characterized by that. The water-retaining pavement injecting material according to claim 1, wherein the water-retaining material is a diatomaceous earth non-fluxed powder. The quick-hardening material 40 to 75 parts by mass, the water retention material 10 to 55 parts by mass of the diatomaceous earth non-flux-added fired powder, and the admixture 3.5 parts by mass or less are included with respect to 100 parts by mass of the cement. The water-retaining pavement injecting material according to claim 2. It contains 45 to 75 parts by mass of a fast-hardening material, 10 to 45 parts by mass of a water retention material composed of a diatomaceous earth non-fluxed additive powder, and 3.5 parts by mass or less of an admixture with respect to 100 parts by mass of cement. The injection material according to any one of claims 1 to 3, wherein the injected material has a compressive strength of 5.4 N / mm ² or more at a material age of 3 hours. The water-retaining pavement injection material according to any one of claims 1 to 4, comprising a thickener in an amount of a viscosity of 150 to 600 mPa · s at a water / powder ratio of 90 to 100%. The injection material according to claim 1 is contained, the water absorption rate by the injection material is 50% or more, the wear amount by 500 N load reciprocation 500 times of the material age of 3 hours is 1000 g / m ² or less, and the amount of dust A water-retaining pavement characterized by being 40 CPM or less. The water retention rate according to claim 6, wherein the water absorption rate by the injected material is 50% or more, the wear amount due to wear of 500N load reciprocating 500 times of 3 hours of age is 600 g / m ² or less, and the dust amount is 15 CPM or less. Pavement.

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