JP2019127685A - Water retentive pavement construction method - Google Patents

Abstract

To provide a cast-in-place water retentive pavement construction method that can be constructed in a short time and with less labor.SOLUTION: A cast-in-place water retentive pavement construction method having drainage characteristics includes the steps of: (A) installing a side gutter concrete block 10 on a concrete or steel plate floor as a base and coating an organic adhesive 2 on the concrete or steel plate floor sandwiched between the blocks 10; (B) spreading a water retaining cement milk 20 on the coated surface; (C) placing a porous concrete 30 so that a part (lower part) of the porous concrete 30 is immersed in the water retaining cement milk 20; and (D) compacting and laying out the porous concrete 30 and curing it.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of constructing a water-retentive pavement.

  It is known that a concrete pavement having water retentivity can be obtained by filling a void of porous concrete with cement milk having water retentivity. Conventionally, the construction of such a water-retentive pavement is carried out in a two-step curing process, such as first filling and curing a water-retaining cement milk in the pores of the porous concrete after constructing and curing porous concrete. It takes labor (Patent Document 1).

JP 2004-108027 A

In Patent Document 1, a water-retaining pavement having drainage can be constructed by adjusting the filling height of the water-retaining cement milk. In the water-retentive pavement having drainage properties, (1) noise reduction effect during vehicle travel and (2) water retention reduction effect on the water retention upper surface in guerrilla heavy rain etc. are latent.
Accordingly, an object of the present application is to provide a construction method for on-site water-retaining pavement having a drainage property that can be constructed in a short time and with little labor while realizing the above-mentioned latent effect. As a result of intensive studies to solve the above problems, the present inventors cast a specific porous concrete after laying a water-retaining cement milk on a concrete or steel floor slab as a base with a predetermined thickness. By leveling and curing the lining, separation of the porous concrete can be prevented, and a predetermined strength can be secured, and by continuously carrying out the construction of the water-retaining cement milk and the porous concrete, the construction can be performed in a short time with less labor. They have found what they can do and have completed the present invention.

  That is, the present invention is a construction method of a cast-in-place water retaining pavement having the following configuration.

[1] (A) A step of installing a concrete block for gutters on a concrete or steel slab as a base and applying an organic adhesive on the concrete or steel slab sandwiched between the blocks,
(B) spreading water-retaining cement milk on the coated surface;
(C) placing the porous concrete so that a part (lower part) of the porous concrete is immersed in the water-retaining cement milk;
(D) A step of compacting and laying out the porous concrete and curing it,
A method of constructing a water-retentive pavement having drainage properties including
The above-mentioned porous concrete has a cement unit amount of 125 to 950 kg / m ³ , a fine aggregate unit amount of 40 to 350 kg / m ³ , a coarse aggregate unit amount of 1100 to 2100 kg / m ³ , a water unit amount of 20 to 180 kg / m ³ , unit amount of thickener or water non-separable admixture is 0.5 to 6.0 kg / m ³ , and high-performance water-reducing agent or high-performance AE water-reducing agent is added to cement 1.7 to 6.0% by mass, and a method for constructing a water-retaining pavement having drainage, characterized in that the water-retaining cement milk is spread with a thickness calculated from the following equation (1): (Spread leveling thickness of water-retaining cement milk = (design thickness of pavement) × (porosity of porous concrete) × D (1), where D is a constant of 0.3 to 0.7. ),I will provide a.
[2] The application method of the water retention pavement having drainage property, wherein the organic adhesive contains an epoxy resin.

According to the construction method of the present invention, separation of porous concrete can be prevented, predetermined strength can be secured, and construction can be performed in a short time with less labor by continuously carrying out construction of water-retaining cement milk and porous concrete .
In addition, if the base is a concrete floor slab or steel floor slab, the reinforcement effect of the floor slab can also be obtained.

It is a figure which shows typically the cross section of the gutter contact part of the pavement in an Example. It is a top view which shows the core extraction position of the pavement in an Example.

  The construction method of the present invention will be described in detail, divided into materials and construction methods.

1. Organic Adhesive As the organic adhesive, it is preferable to use a two-component adhesive of a main agent of an epoxy resin and a curing agent containing an aliphatic carbon compound of a polyamine or a one-component adhesive obtained by mixing these. Two-component is more preferable from the viewpoint of pot life.
Specifically, when the base is concrete, a two-part adhesive of a curing agent containing an epoxy resin main component and polythiol and an aliphatic polyamine, a one-component adhesive mixed with these, an epoxy resin main component and a polyamidoamine And a two-component adhesive of a curing agent containing a modified aliphatic amine or a one-component adhesive obtained by mixing these. On the other hand, when the base is a steel floor plate, it is preferable to use a two-component adhesive of a main component of an epoxy resin, a curing agent containing polyamidoamine and a modified aliphatic amine, or a one-component adhesive obtained by mixing these.

2. Water-retaining cement milk As water-retaining cement milk, for example, at least one powder selected from autoclaved aerated concrete (ALC) powder, pearlite powder, rock wool powder, sepiolite powder and particles Examples include water-retentive cement milk containing granules, water, cement, and a water reducing agent.

  The average particle size is preferably 2 mm or less, and the average particle size is 0.1 to 1.5 mm from the ease of construction of the water-retaining pavement and the water-retaining ability of the water-retaining pavement. It is more preferable that the average particle size is 0.2 to 1.0 mm. Water can use tap water etc. The blending amount of water is preferably 500 parts by mass or less, and 100 to 300 parts by mass with respect to 100 parts by mass of the granular material, from the viewpoint of ease of construction of the water-retaining pavement, water retention ability of the water-retaining pavement, and the like. More preferred.

  As the cement, various Portland cements and various mixed cements can be used. The blending amount of the cement is preferably 300 parts by mass or less, and 50 to 250 parts by mass with respect to 100 parts by mass of the granular material, from the viewpoint of ease of construction of the water-retaining pavement and the water-retaining ability of the water-retaining pavement. More preferable.

  As the water reducing agent, a lignin type, naphthalene sulfonic acid type, melamine type, polycarboxylic acid type water reducing agent, AE water reducing agent, high performance water reducing agent or high performance AE water reducing agent can be used. The blending amount of the water reducing agent (solid content) is preferably 1 part by mass or less with respect to 100 parts by mass of cement from the viewpoint of ease of construction of the water-retaining pavement, water retention ability of the water-retaining pavement, and the like. More preferably, it is 5 parts by mass.

  The method and apparatus for kneading water-retaining cement milk are not particularly limited, and the mixing may be performed using a conventional mixer according to a conventional method. The water retention cement milk preferably has a P funnel flow-down time of 9 to 13 seconds in view of the ease of construction of the water retention cement milk and the ease of construction of the water retention pavement.

3. Porous Concrete The materials to be used in the present invention and their preferred proportions will be described.
The cement is not particularly limited, and, for example, various portland cements such as ordinary portland cement, early strength portland cement, super early strength portland cement, moderate heat portland cement, sulfate resistant portland cement, low heat portland cement, blast furnace cement Various mixed cements such as fly ash cement and silica cement, eco-cement, silica fume premix cement, limestone powder mixed cement and the like can be used.

The unit amount of cement is preferably 125 to 950 kg / m ³ , more preferably 200 to 850 kg / m ³ , and particularly preferably 300 to 750 kg / m ³ from the viewpoint of strength development after hardening and durability.

Water is not particularly limited, and tap water, sludge water, treated sewage water, etc. can be used. The unit amount of water is preferably 20 to 180 kg / m ³ , more preferably 40 to 150 kg / m ³ , and particularly preferably 60 to 130 kg from the viewpoints of ease of kneading, strength development after curing, and durability. / M ³

Fine aggregate includes river sand, mountain sand, land sand, sea sand, crushed sand, silica sand, artificial fine aggregate (eg, calcined fine aggregate obtained by firing slag fine aggregate, fly ash, etc.), regenerated fine Aggregates or mixtures thereof can be used. The unit amount of the fine aggregate is preferably 40 to 350 kg / m ³ , more preferably 60 to 300 kg / m ³ , and particularly preferably 80 from the viewpoint of ease of kneading, strength development after hardening, and durability. It is ̃250 kg / m ³ .

As the coarse aggregate, river gravel, mountain gravel, land gravel, crushed stone, artificial coarse aggregate (for example, sintered coarse aggregate obtained by firing slag coarse aggregate, fly ash, etc.), regenerated coarse aggregate, or these And mixtures thereof can be used. The unit amount of the coarse aggregate is preferably 1100 to 2100 kg / m ³ , more preferably 1200 to 2000 kg / m ³ , and particularly preferably 1300 to 1900 kg from the viewpoint of water retention ability, strength development and durability of the water retention pavement. / M ³

Examples of thickeners or water-inseparable admixtures include cellulose-based thickeners such as methylcellulose, hydroxypropylmethylcellulose, and hydroxyethylmethylcellulose or water-inseparable admixtures, and acrylamide homopolymers and acrylamide copolymers. And at least one selected from acrylic thickeners or non-separating admixtures in water. In particular, one using a water-soluble cellulose ether is preferable. The unit amount of the thickener or the non-separating admixture in water is preferably 0.5 to 6.0 kg / m ³ , more preferably 0.2, from the viewpoint of easiness of kneading and prevention of material separation at the time of placing. It is 6 to 5.0 kg / m ³ , particularly preferably 0.7 to 4.0 kg / m ³ .

  As the high-performance water-reducing agent or high-performance AE water-reducing agent, a high-performance water-reducing agent such as naphthalene sulfonic acid or polycarboxylic acid or a high-performance AE water-reducing agent can be used. The blending amount of the high-performance water reducing agent or the high-performance AE water reducing agent is preferably 1.7 to 6.0% by mass with respect to the cement from the viewpoint of ease of kneading, strength development after curing and durability, 2.0-5.0 mass% is more preferable, and 2.5-4.5 mass% is especially preferable.

  In this invention, you may mix | blend an inorganic type admixture as needed. Examples of inorganic admixtures to be blended as required include blast furnace slag powder, fly ash, silica powder, silica fume, volcanic ash, limestone powder, gypsum such as anhydrous gypsum and gypsum, expansive material and the like. The blending amount of the inorganic admixture is 40 parts by mass or less with respect to the total amount of 100 parts by mass with cement from the viewpoint of ease of kneading, strength development after curing, and durability (40 parts of cement). The upper limit is substitution of the mass% portion).

  In the present invention, an AE agent may be blended as needed. The blending amount of the AE agent is preferably 0.1% by mass or less, more preferably 0.01 to 0.03% by mass with respect to the cement from the viewpoint of strength development after curing and durability.

  In kneading the porous concrete, each material constituting the porous concrete is put into a mixer, and the mixture is kneaded until a coarse aggregate coated with mortar is obtained. The apparatus used for kneading is not particularly limited, and a conventional mixer such as an omni mixer, a pan-type mixer, a biaxial kneading mixer, and a tilting cylinder mixer can be used. Further, the order of introduction of the respective materials into the mixer is not particularly limited.

4. Construction method of water-retaining pavement (A-1) When the base is concrete, remove the concrete latency, dirt and deposits, mix the adhesive, and apply to the concrete with a spatula, brush or the like. In addition, when removal of latance, stain | pollution | contamination, etc. is performed by a blast process, the bonding surface on the concrete of the adhesive agent which the surface roughened moderately and was apply | coated becomes large, and is advantageous. In addition, as concrete of a base, on-site cast concrete pavement, a concrete floor slab, etc. are mentioned. Next, install a gutter block for concrete on the base. The installation method of the gutter concrete block is not particularly limited, and may be performed by a conventional method.
In the present invention, an adhesive may be applied after the gutter concrete block is installed first and the concrete is not covered with the concrete in the portion sandwiched between the concrete blocks and the like.
(A-2) When the base plate is a steel floor plate, the stains and deposits on the steel floor plate are removed, and the adhesive is mixed and applied to the steel floor plate with a spatula, a brush or the like. In addition, if removal of dirt and deposits is carried out by blasting, the surface is appropriately roughened, and the bonding area on the steel floor plate of the adhesive applied is advantageous, which is advantageous. Next, install a gutter block for concrete on the base. The installation method of the gutter concrete block is not particularly limited, and may be performed by a conventional method.
In the present invention, the gutter concrete block may be installed first, and after removing dirt and the like of the steel floor plate in the portion sandwiched by the concrete block, the adhesive may be applied.

In the present invention, the gutter concrete block has a through hole for passing drainage through the side wall in contact with the water retaining pavement. The position (height) of the through hole may be set according to the filling height of the water-holding cement milk in the water-holding pavement.

(B) Next, after a predetermined time has elapsed, water-retaining cement milk is spread on the concrete or steel floor slab (base) that is sandwiched between the side-groove concrete blocks and coated with adhesive. Further, the method of leveling the water-retaining cement milk is not particularly limited, and may be performed by a conventional method.

  In the present invention, the water-retaining cement milk is spread to a thickness of (design thickness of pavement) × (porosity of porous concrete) × D (D is a constant of 0.3 to 0.7). If the spread thickness of the water retaining cement is smaller than the value calculated from the above equation, the water retaining function is reduced. When the spread thickness of the water-retaining cement exceeds the value calculated from the above equation, the noise reduction effect at the time of running the vehicle is reduced, and the drainage function is also reduced. In the above formula, D is preferably 0.4 to 0.6. At this time, the ease of construction of the water retaining pavement and the water retaining ability of the water retaining pavement are simultaneously satisfied.

(C) Next, the porous concrete is placed so that a part (lower part) of the porous concrete is immersed in the water-retaining cement milk. The method for placing porous concrete is not particularly limited, and it may be performed by a conventional method.

(D) Next, the porous concrete is compacted with a pressure vibrator and spread on a construction site, and then cured. As the pressure vibrator, a tamping rammer, a plate compactor, a vibro compactor, a finisher, a vibration roller and the like conventionally used for concrete pavement can be used. In the present invention, the porous concrete is compacted and spread to fill the voids in the porous concrete with the water-retaining cement milk. The curing method is not particularly limited, and may be carried out by a conventional method.

  In (B), after application of the adhesive, the environmental temperature is about 5 ° C. within 6 hours, preferably within 5 hours), and the environmental temperature is about 20 ° C. within 2 hours (more preferably within 90 minutes). The water-retaining cement milk is preferably spread and leveled at an environmental temperature of about 30 ° C. within 50 minutes (more preferably within 40 minutes). If left for a long time, there is a possibility that the adhesion effect can not be sufficiently exhibited.

  The water-retentive pavement of the present invention can be applied to sidewalks, parking lots, parks, revetments of rivers, etc. in addition to roadways.

Hereinafter, the present invention will be described by way of examples, but the present invention is not limited to these examples.
(A) Materials Used Table 1 shows materials used for porous concrete, and Table 2 shows materials used for water-holding cement milk. The adhesive is shown in Table 3.

(B) Formulation Table 4 shows the formulation of porous concrete, and Table 5 shows the formulation of water-holding cement milk. The adhesive used a main agent and a curing agent at 4: 1 (mass ratio). The porosity of porous concrete was measured by placing a 1 mm thick iron plate (mass: 60 g) on porous concrete packed in a steel mold with an inner diameter of 10 cm and a height of 20 cm, and further placing a weight on the iron plate. (Mass is 4kg), vibrate for 120 seconds from the top of the weight using a wall hitting vibrator, and based on the volume (Vb) of the porous concrete after the vibration, the porosity is calculated using the following formula did.
Void percentage (volume%) = 100- (W / (Vb × T)) × 100
(Wherein, W represents the mass of the porous concrete charged into the mold, Vb represents the volume of the porous concrete after vibration, and T represents the unit of blending the porous concrete calculated with the porosity being 0% by volume. Represents a volume mass)

(C) Method of producing porous concrete and water-retaining cement milk In the production of porous concrete, all materials are put together at a ready-mixed concrete plant using a horizontal twin-screw forced mixer with a nominal capacity of 3.0 m ³ The mixture was poured into a mixer and kneaded for 2 minutes.
A universal mixing stirrer was used to mix the water-holding cement milk. Water, admixture, cement and water-retaining material were charged and kneaded for 2 minutes. The P funnel flow-down time of the water-retaining cement milk was 11 seconds.

(D-1) Construction, curing and drainage evaluation (Examples 1 to 3 and Comparative Example: In the case where the base is concrete)
The gutter concrete block 10 is placed on the blasted base 1 and the adhesive in Table 3 is applied with a spatula and a brush at a coating weight of 1.0 kg / m ² to form an adhesive layer on the base 1 2 was formed. Then, after the water-retaining cement milk 20 shown in Table 4 was spread on the base 1 sandwiched between the blocks to a predetermined thickness a (13 mm), each porous concrete shown in Table 3 having a porosity of 17.5% was prepared. 30 were spread and compacted using a vibratory asphalt finisher. Next, it was finished by compacting with a rubber-made vibrating roller. Thereafter, a vinyl sheet was quickly laid on the surface of the porous concrete and cured until the age of 7 days to construct the water-retaining pavement shown in FIG. The design thickness of the pavement is 150 mm, and the target filling height b of the water-retaining cement milk is 75 mm (D in formula (1) is 0.5).
In addition, as the concrete block for the side groove, there are three U-shaped grooves having a width of 150 mm, a length of 600 mm, and a height of 150 mm (three through-holes 11 having a diameter of 50 mm centered on a position of a height of 75 mm on the side wall in contact with the water-retaining pavement) Used at intervals). Also, from the construction of water-retentive pavement to the end of curing, apply gum tape 12 (peeling after curing) on the inner surface side of the through-hole so that water-retaining cement milk and porous concrete do not leak into the U-shaped groove. It was constructed. In FIG. 1, the aggregate etc. of porous concrete are emphasized and shown in figure typically.
When the water equivalent to 50 mm of time was supplied for 1 hour to the water retaining pavement of Examples 1-3 of material age 28th, the retention of water on the upper surface of a pavement surface was not recognized.
Next, a cylindrical core having a diameter of 100 mm was collected from the positions shown in FIG.

(D-2) Construction, curing and drainage evaluation (reference example)
Using the porous concrete of Example 1 in Table 3, the concrete block for the side groove was not installed, and the target filling height of the water-retaining cement milk was 150 mm (D in formula (1) is 1.0). A water-retentive pavement was constructed in the same manner as in Example 1 except for the above.
When water equivalent to 50 mm of rainfall per hour was supplied to the water retaining pavement of the reference example of material age 28 for 1 hour, water stagnated on the upper surface of the pavement and a water pool was formed.

(E) Test items and test method (1) Filling condition of water-retaining cement milk The cores 1 to 3 were split vertically, and the filling height of the water-retaining cement milk was confirmed by visual observation of the split cross section.
(2) Amount of water retained After the specimen was immersed in a constant temperature water bath at 20 ° C. for 24 hours, water droplets around the specimen were gently wiped with a waste cloth, and the wet mass (W _t ) of the specimen was measured. Thereafter, the specimen was put in a drying furnace and dried at 60 ° C. for 24 hours, and then the dry mass (W _d ) of the specimen was measured. The water retention amount (kg / m ² ) was determined by equation 1.

(3) Adhesion strength No. The adhesion strength of the concrete and the porous concrete was measured at 10 to 12 points using a bond-type adhesion tester.
(4) Compressive strength It was based on JIS A 1107 "Method of collecting core from concrete and test method of compressive strength".

(F) Test results Table 6 shows test results of water retention amount, Table 7 shows compressive strength test results, and Table 8 shows adhesion strength test results. From Tables 5 and 6, it is understood that the water retention amount and the compressive strength are high in the water retention pavement of Examples 1 to 3 using the porous concrete containing the thickener. Moreover, as a result of visual observation, in the water retentive pavement of Examples 1 to 3, the water retentive cement milk was filled up to the top of the pavement.
On the other hand, in the water retention pavement of the comparative example using porous concrete which does not contain a thickener, the compressive strength was low.

Example 4 (when the base plate is a steel floor plate)
A side gutter concrete block (same as that used in Example 1) was placed on a blasted steel slab, and the adhesive of Table 9 was applied at a coating amount of 1.0 kg / m ² with a spatula and a brush. Applied using Thereafter, the water-retaining cement milk of Table 5 is spread to a thickness of 13 mm, and the porous concrete of Example 1 of Table 4 in which the porosity is equalized to 17.5% is spread using a vibratory asphalt finisher. I made a compaction. Next, it was finished by compacting with a rubber-made vibrating roller. Thereafter, promptly, a vinyl sheet was laid on the surface of the porous concrete and cured to a material age of 7 days to construct a water retaining pavement shown in FIG. The design thickness of the pavement is 150 mm. Next, on the 28th day of material age, a cylindrical core having a diameter of 100 mm was collected from the position shown in FIG. 1 of the pavement.
In the same manner as in Example 1, (1) filling condition of water-holding cement milk, (2) water holding capacity,
(3) Adhesion strength and (4) compressive strength were measured.
As a result, the average water retention amount was 0.09 (kg / m ² ), the average adhesion strength was 2.91 (N / mm ² ), and the average compression strength was 40.0 (N / mm ² ). The Also, as a result of visual observation, the water-holding cement milk was filled to the top of the pavement.

1: Base 2: Organic adhesive 10: Concrete block 11 for gutters: Through hole 12: Gum tape 20: Water holding cement milk 30: Porous concrete a: Water holding cement milk spread height b: Water holding cement milk Target filling height of

Claims (2)

(A) installing a concrete block for gutter on concrete or steel floor slab which is a base, and applying an organic adhesive on the concrete or steel floor slab sandwiched between the blocks;
(B) spreading water-retaining cement milk on the coated surface;
(C) placing the porous concrete so that a part (lower part) of the porous concrete is immersed in the water-retaining cement milk;
(D) A step of compacting and laying out the porous concrete and curing it,
A method of constructing a water-retentive pavement having drainage properties including
The above-mentioned porous concrete has a cement unit amount of 125 to 950 kg / m ³ , a fine aggregate unit amount of 40 to 350 kg / m ³ , a coarse aggregate unit amount of 1100 to 2100 kg / m ³ , a water unit amount of 20 to 180 kg / m ³ , unit amount of thickener or water non-separable admixture is 0.5 to 6.0 kg / m ³ , and high-performance water-reducing agent or high-performance AE water-reducing agent is added to cement And 1.7 to 6.0 mass%,
A method of constructing a water-retentive pavement having drainage performance characterized by laying the water-retaining cement milk at a thickness calculated from the following equation (1).
Spreading thickness of water-retaining cement milk = (pavement design thickness) x (porosity of porous concrete) x D (1)
D in the above formula is a constant of 0.3 to 0.7 The method according to claim 1, wherein the organic adhesive contains an epoxy resin.