JP5785217B2 - Paving materials and paving blocks - Google Patents

Description

  The present invention relates to a paving material and a paving block, and more particularly to a paving material and a paving block suitable for light paving such as a sidewalk.

  Earth-based pavement adopted as light pavement such as sidewalk has elasticity, water retention, water permeability that natural soil has, and is constructed as a pavement that contributes to absorption of impact and stabilization of road surface temperature, The effect of suppressing the rise in road surface temperature is high, and it is attracting attention as a countermeasure for the heat island phenomenon. In addition, because it is easy to harmonize with the surrounding natural environment, it is also used for landscape-oriented applications such as parks and promenades, and because it uses soil, it is advantageous in terms of cost. The pavement material for earth-based pavement is generally a mixture of soil and sand and a binder such as cement, asphalt, lime, and resin (see Patent Documents 1 and 2).

JP 2005-344348 A JP 2007-205010 A

However, the conventional earth-based pavement material may be insufficient in the following points.
(1) When two to three years have passed since the construction, the surface deteriorates, partly peels off and deforms into an uneven shape, and walking performance decreases. Particularly in winter, the surface layer surface deteriorates due to repeated freezing and thawing phenomenon due to temperature difference between temperatures, causing cracks, partial peeling, fluidization into sand, and the like, resulting in poor frost damage resistance.
(2) The value of the bending strength required as the pavement strength is low, and the pavement performance deteriorates due to insufficient strength.
(3) The water permeability required as an element of walking performance is insufficient. For example, in the case of rainfall of about 10-15 mm / h, the water permeability coefficient is about 1.0 × 10 ⁻⁵ to 10 ⁻⁷ cm / sec. As a result, a puddle is created, causing the pedestrian to slide and have difficulty walking.

  The present invention has been made in order to solve the problems of the above-described conventional earth-based pavement, and can improve durability and strength, and can also ensure water permeability and water retention. And to provide paving blocks.

Paving material of the present invention, the bone material composed of a porous water granulated slag particles and soil, containing Portland cement as a binder, and contains an acrylic polyether graph preparative high molecular compound as an admixture, the portland The admixture is contained in a weight ratio of 0.003 or more with respect to the weight 1 of the toner, the granulated slag particles are 10 to 25 by weight, and the soil is 1.0 to 5.0 by weight. It contains by a ratio (Claim 1).

  As the granulated slag of the present invention, a granulated blast furnace slag having glassy particles obtained by quenching a molten slag produced in a blast furnace with water is suitably used. For example, it can be obtained by injecting pressurized water having a predetermined water pressure and water amount into the molten slag. Although hard and heavy hard granulated slag can be divided into porous and light soft granulated slag depending on the pressure and amount of pressurized water, soft granulated slag is preferably used in the present invention.

  When paving with the pavement material of the present invention, due to the presence of pores between granulated slag particles bonded with Portland cement, and the presence of pores in the granulated slag particles, pavement with higher porosity Become. Therefore, the water dropped on the upper surface of the pavement immediately soaks into the pavement, so that sufficient water permeability is ensured. In the present invention, granulated slag particles having an outermost outer diameter of 5 mm or less are preferably used. Moreover, in this invention, the improvement of bending strength and compressive strength is achieved by containing the said admixture 0.003 or more by weight ratio with respect to the weight 1 of Portland cement. When the weight ratio of the admixture is less than 0.003, the effect of adding cannot be expected, and therefore, the content of 0.003 or more is required. In addition, since the blending ratio of Portland cement is relatively low, about 3 to 9%, the occurrence of heat shrinkage is suppressed, and the amount of soil increases accordingly, so that construction can be performed at low cost.

In the present invention, the weight 1 of the Portland cement, the water-granulated 10-25 slag particles in a weight ratio, you in a proportion of 1.0 to 5.0 the soil by weight. This ratio purpose reliably achieve the present invention, and Ru are balanced permeability and strength.

Next, the paving block of the present invention is formed by molding the paving material according to claim 1 .

  ADVANTAGE OF THE INVENTION According to this invention, the problem which the conventional earth-type pavement material has is solved, and while improving durability and intensity | strength, the pavement material and the block for pavement which can ensure water permeability and water retention are provided. There is an effect such as.

It is sectional drawing which shows an example of the pavement using the pavement material of embodiment of this invention. It is a graph which shows the bending strength of the pavement material at the time of changing the mixture ratio of an admixture. It is a graph which shows the compressive strength of the pavement material at the time of changing the mixture ratio of an admixture.

Embodiments of the present invention will be described below.
FIG. 1 shows a cross section of a road pavement using a pavement according to the present invention. This pavement is constructed by laying roadbed 2 on roadbed 1 with hydraulic granularity adjusting slag, crushed stone (crusher run), gravel, etc., and laying the pavement according to the present invention on roadbed 2. 3 is formed. The thickness of the roadbed 2 and the pavement 3 is appropriately set according to use conditions. For example, in the case of a light pavement such as a sidewalk, a promenade, a park road in a park, a poolside, a gateball field, etc., where a person mainly walks, the thickness is, for example, about 5 cm. Further, when a person receives a light impact such as a roller skating rink, a cycling road, or a tennis court, the thickness of the roadbed 2 is increased to absorb the impact. The pavement material according to the present invention is suitable for pavement that requires such shock absorption.

Paving material of the present invention, the bone material composed of a porous water granulated slag particles and soil, containing Portland cement as a binder, and contains an acrylic polyether graph preparative high molecular compound as an admixture, Portland cement For example, a liquid admixture is contained in a weight ratio of 0.003 or more with respect to a weight of 1, and further, granulated slag particles are contained in a weight ratio of 10 to 25 and soil is in a weight ratio with respect to the weight of Portland cement. In a ratio of 1.0 to 5.0. As the soil, a general soil for pavement such as pure sand is used. Other soil such as Iwase sand may be mixed appropriately, or other soil may be used alone. Moreover, it is even better if soil such as pure sand soil is used, for example, in a completely dry state in a bag.

  Since the pavement material of the present invention solidifies relatively early when mixed with water, it is desirable to mix the pavement material on the pavement site. Laying pavement materials, for example, by installing a formwork on a roadbed to form a single section, providing joints inside the formwork, and laying a pavement material mixed with water inside the formwork. Compress with a roller. In this way, the compaction of one section surrounded by the formwork is finished, and then the paving material is similarly laid on the roadbed of the adjacent section. In this case, the formwork that is the boundary between the adjacent sections Remove the mold material. And by pavement to the said division, a joint material will be left in the boundary of adjacent divisions. By laying the paving material in this way, the joint material can be arranged very accurately with respect to the design. Therefore, the amount of expansion of the pavement during curing can be set as calculated, and occurrence of problems such as protrusion of joint materials can be prevented. In addition, paving can also be performed by forming a block of a predetermined size using the paving material of the present invention and spreading the block on the roadbed.

Examples of the present invention will be described below.
(1) Manufacture of test body Portland cement, “blast furnace granulated slag + masa sand” as an aggregate and an admixture were prepared in the following weight ratio. Admixtures, with Grace Chemicals Inc. A acrylic polyether graph preparative high molecular compound is a concrete strength enhancers "MSP-20".
・ Portland cement: 1
-Granulated slag: 10.4
・ Maasa sand: 1.6
・ Admixture: 0.005

  The pavement material composed of the above components was put into a mortar mixer with a capacity of 100 liters and subjected to air kneading for 1 minute 30 seconds, then water was added and further kneaded for 1 minute 30 seconds, and Table 1 shows according to each test. Test specimens were manufactured. In addition, the test body was taken out from the mold after 48 hours had elapsed after filling the kneaded material into a steel mold. Subsequently, it was left to stand for a maximum of 28 days in an environment of a temperature of 20 ± 3 ° C. and a humidity of 80% or more. In the following description, the leaving period may be referred to as “material age”.

(2) Various tests (2-1) Bending strength and compressive strength Bending strength and compression according to JIS R 5201 (cement physical test method) for three specimens left for 7 days and three specimens left for 28 days Strength was measured. The results are shown in Table 2.

  As is apparent from the results shown in Table 2, it can be seen that the test specimens made of the paving material having the above-mentioned blending ratio increase both in bending strength and compressive strength until reaching the age of 28 days after being compacted. . Further, it was confirmed that the bending strength and compressive strength reached on the 28th day showed sufficient values for pavement.

  Here, Table 3 shows the bending strength and compressive strength of the paving material when the admixture is changed to the following as a comparative example. The manufacturing method of the pavement material and the test body is the same as described above, and the test values are 28 days old. The blending ratio of Portland cement, granulated slag, and sand sand was the same weight ratio as in the above examples, and the weight ratio of the admixture was 0.04, which is the standard for each admixture.

-Admixture of Comparative Example 1 Vinyl acetate resin emulsion soil erosion inhibitor (Esfix Sekisui Fuller)
-Admixture of Comparative Example 2 Ethylene vinyl acetate copolymer emulsion mortar adhesion enhancer (NS Highflex HF1000 Nippon Kasei Co., Ltd.)

  At 28 days of age, both Comparative Examples 1 and 2 were inferior in bending strength and compressive strength to the above Examples (Table 2), and it was confirmed that the admixture of the present invention was superior in strength.

(2-2) Slip resistance The slip resistance value of the surface when the test specimen was wet was measured according to ASTM E 303 (British portable skid resistance tester method). The test results are shown in Table 4. The slip resistance values shown in Table 4 were sufficient values for pavement. This is because the surface of the test specimen has innumerable irregularities, so that it is a structure that does not slip even when wet.

(2-3) Water permeability The water permeability test prescribed | regulated to the interlocking block pavement design construction procedure (Interlocking block pavement technical association) was done with respect to the test body. The results are shown in Table 5. With the water permeability shown in Table 5, it was confirmed that when water was poured into the test specimen, it permeated almost simultaneously, and water did not stay on the surface of the test specimen. Moreover, the water permeability coefficient certified as water-permeable pavement “1.0 × 10 ⁻² cm / sec” is sufficiently exceeded. Therefore, it is possible to obtain a pavement surface in which a puddle is unlikely to generate even in the case of a heavy rainfall of about 30 mm / h, for example.

(2-4) Content of Admixture The weight ratio of the admixture is 0.001 (0.1 wt%), 0.003 while maintaining the above-mentioned weight ratio of Portland cement, granulated blast furnace slag and pure sand. (0.3% by weight), 0.005 (0.5% by weight), 0.007 (0.7% by weight), and 0.01 (1.0% by weight). In the same manner as in the above production method, three test specimens were produced for each weight ratio of the admixture. And about these 28-day-old test bodies, bending strength and compressive strength were measured in accordance with JIS R 5201 (physical test method for cement). The results are shown in Table 6 and FIGS. In Table 6, FIG. 2, and FIG. 3, the content of the admixture is shown by weight% with respect to Portland cement.

  According to Table 6, FIG. 2, and FIG. 3, when the content of the admixture is less than 0.003, that is, 0.3% by weight with respect to Portland cement 1, the bending strength and compressive strength tend to decrease. It was confirmed that the bending strength and the compressive strength showed sufficient values for pavement if the content was 0.3% by weight or more.

(3) Durability When the experimental road surface paved on the applicant's private land (experiment yard) with the pavement material of the example was observed for more than 5 years, the surface was partially peeled or cracked and the walking performance was reduced. No problem occurred. This is because, in addition to the high bending strength and compressive strength as described above, the composition of aggregate (granulated slag + pure sand soil) is similar to Portland cement and has excellent compatibility as a paving material. Can be mentioned.

  Also, because the main component of granulated blast furnace slag, which is the main aggregate, is the same as cement, the hydration reaction takes place due to its characteristics, and it will consolidate with latent hydraulic properties over time, resulting in increased strength. There is an advantage of doing.

  In the above field experiment, the freezing and thawing phenomenon under the condition of 5 ° C. below the freezing point in winter was observed, and it was confirmed that the surface layer was not deteriorated and excellent in frost damage resistance. Further, as a result of carrying out a test of the in-frozen frozen water thawing method specified in JIS A 1435, it was found that it exceeded the upper limit of 200 cycles and could withstand repeated freezing and thawing.

1 ... Subgrade 2 ... Subbase 3 ... Pavement

Claims (2)

The bone material composed of a porous water granulated slag particles and soil, containing Portland cement as a binder, and contains an acrylic polyether graph preparative high molecular compound as an admixture,
For the weight of Portland cement 1
The admixture is contained in a weight ratio of 0.003 or more , the granulated slag particles are contained in a weight ratio of 10 to 25, and the soil is contained in a weight ratio of 1.0 to 5.0. Pavement material. A paving block formed by molding the paving material according to claim 1 .

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