JP6014290B1 - Paving materials and paving blocks - Google Patents

Abstract

An object of the present invention is to provide a paving material and a paving block mainly for exteriors that have both strength and water retention. A paving material comprising an aggregate in which porous granulated slag particles and fine-grained crushed stone are mixed, and Portland cement as a binder, wherein the granulated slag particles and crushed stone in the aggregate are In addition, by weight, the granulated slag particles are contained in a proportion of 90 to 50% and crushed stone in a proportion of 10 to 50%. [Selection] Figure 1

Description

  The present invention relates to a pavement material and a pavement block, and more particularly to a pavement material and a pavement block suitable for light pavement constituting a surface layer such as an exterior, a promenade, and a light traffic road.

  For example, the external structure around the building constitutes a part of the space and environment surrounding the building, and the exterior pavement is also required to have decorativeness, functionality, and the like. Such exterior pavement materials are mainly composed of aggregate mixed with cement, such as those using granular roof tiles crushed as aggregates, and those with specific polymers added as admixtures. It has been proposed (Patent Documents 1 and 2).

JP 2004-052440 A JP 2004-107101 A

  However, conventional pavement materials for exteriors are insufficient in terms of strength and durability, and there is also a demand for pavement materials with water retention, so these are satisfied. The development of paving materials was desired.

  This invention is made | formed in view of the said situation, Comprising: It aims at providing the paving material and paving block which combined durability based on high intensity | strength, and fastness and water retention.

The paving material of the present invention is a paving material comprising an aggregate in which porous granulated slag particles and fine crushed stone are mixed, and Portland cement as a binder, wherein the granulated slag in the aggregate compounding ratio of the crushed stone and the particles, by weight, said slag particles from 90 to 50%, wherein Ri crushed stone 10-50% der, particle size of the crushed stone is 20～2.5Mm, wherein Portland cement is mixed in an amount of 15 to 30% by weight with respect to the aggregate, the bending strength is 3.44 to 8.17 (N / mm ² ), and the water retention amount is 0.15 to 0.30. (G / cm ³ ) (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. On the other hand, crushed stones can be used at stores such as general building material stores and horticultural stores, and are therefore easy to obtain, low in cost, and can be locally produced and consumed locally. Can be said to be effective.

  When pavement is performed with the pavement material of the present invention, the pavement has a higher porosity due to the presence of pores between the granulated slag particles of the aggregate and the pores in the granulated slag particles. Therefore, the water dropped on the upper surface of the pavement immediately soaks into the pavement and thus has high water permeability. And since water retains in the hole, it has water retention. On the other hand, the crushed stone mixed in the aggregate and the latent hydraulic properties of the granulated slag particles are combined to improve the bending strength, resulting in high durability and fastness. Pavement that combines strength and water retention in a well-balanced manner by combining the ratio of granulated slag particles and crushed stone in the aggregate to 90 to 50% by weight, and 10 to 50% of crushed stone. Become a material.

As described above in the present invention, the crushed stone of particle size (diametral outermost diameter) you being a 20～2.5Mm. When the particle size of the crushed stone exceeds 20 mm, workability such as difficulty in mixing the materials is deteriorated. On the other hand, when the particle size is less than 2.5 mm, the strength improving effect by the crushed stone is hardly obtained. In this range, the particle size of crushed stone is more preferably 15 to 5 mm, and still more preferably 12 to 8 mm. The particle size of the crushed stone of the present invention is preferably in the range of No. 5 to No. 7 in terms of the type of single-grain crushed stone, and among these, No. 6 is more preferred.

In the present invention, the granulated slag particles have a particle size (passing outermost diameter) of 5 mm or less (Claim 2 ). When the granulated slag particles have a particle size of 5 mm or less, water permeability and water retention by the granulated slag particles can be obtained accurately.

Incidentally, the paving material of the present invention, admixtures for suppressing the generation of expansion or contraction of the pavement due to the influence of solar heat are added as needed. In addition, for example, by adding a colorant such as an inorganic pigment for coloring, for example, exterior pavement can be paved in a color that matches the surrounding landscape.

Next, the paving block of the present invention is formed by molding the paving material according to claim 1 or 2 .

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that the pavement material and the block for pavement which have durability based on high intensity | strength, and has both solidity and water retention are provided.

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 test result of the bending strength and water retention performed in the Example. It is a graph which shows the bending strength and water retention test result at the time of changing the cement ratio with respect to an aggregate.

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 the roadbed 2 with a predetermined thickness of hydraulic particle size adjusting slag, crushed stone (crusher run), gravel, etc. on the roadbed 1 and paving the pavement according to the present invention on the 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 an external pavement, a promenade, or a park path in a park where a person mainly walks, the thickness is, for example, about 7 cm. In addition, the thickness is about 10 cm in a place where a small or medium-sized vehicle may pass.

  The pavement of the present invention is a mixture of porous granulated slag particles and fine-grained crushed stone mixed with Portland cement as a binder, and the granulated slag particles and crushed stone in the aggregate The blend ratio is 90 to 50% of granulated slag particles and 10 to 50% of crushed stone, and an admixture for suppressing the occurrence of expansion or contraction due to the effect of heat is added as necessary. Is done. The blending ratio of Portland cement is 10 to 20% by weight of the entire paving material. As described above, crushed stone having a particle size of 20 to 2.5 mm is used, and granulated slag particles having a particle size of 5 mm or less are used.

  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. Clamp 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 becomes 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 specimens Aggregates of "blast furnace granulated slag with a particle size of 5 mm or less + crushed stone (single-grained crushed stone: No. 6)" are shown in Table 1 as the mixing ratio of slag and crushed stone. Portland cement was mixed at a weight ratio of 16% with respect to the aggregate to prepare paving materials of Examples 1 to 5 and Comparative Examples 1 to 4.

  After putting the pavement materials of Examples 1 to 5 and Comparative Examples 1 to 4 into a mortar mixer having a capacity of 100 liters and performing kneading for 1 minute and 30 seconds, adding water and further kneading for 1 minute and 30 seconds, Test bodies corresponding to Examples 1 to 5 and Comparative Examples 1 to 4 to be used in a bending strength test and a water retention test described later were manufactured. In addition, each test body filled out the kneaded pavement material material in the steel mold, and was solidified, and after 48 hours passed, it took out from the 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.

(2) Bending strength test The bending strength of each specimen was measured according to JIS R 5201 (cement physical testing method). The results are shown in Table 1 and shown in FIG.

(3) Water retention test The water retention test prescribed | regulated to the interlocking block quality standard for water retentive pavement (Incorporated Association interlocking block pavement technical association) was done with respect to the test body. The results are shown in Table 1 and shown in FIG.

In the interlocking block quality standard for water retentive pavement, regarding the quality of the water retentive block to be applied to the “sidewalk / pedestrian road”, the bending strength: 3.0 (N / mm ² ) or more, the water retention amount: 0. It is specified to be 15 g / cm ³ or more. According to Table 1 and FIG. 2, Examples 1-5 of this invention satisfy | fill both these bending strength and water retention value. On the other hand, in Comparative Examples 1 and 2 to 4 that depart from the present invention, Comparative Examples 2 to 4 containing crushed stone are lower than the specified value. Therefore, in the aggregate containing granulated slag and crushed stone, the range of Examples 1-5, that is, the content in the aggregate is in the range of granulated slag particles: 90-50%, crushed stone: 10-50%. It was confirmed that a pavement material having a good balance between strength and water retention could be obtained.

(4) Verification of cement ratio Ratio of Portland cement mixed in aggregate of Example 3 (granulated slag: 70% by weight, crushed stone: 30% by weight) that has the highest bending strength and sufficient water retention Specimens were prepared in the same manner as described above, and a bending strength test and a water retention test were performed in the same manner as described above. The results are shown in Table 2 and FIG. The cement ratio (%) in Table 2 and FIG. 3 is the weight ratio of cement to aggregate.

  According to Table 2 and FIG. 3, it can be seen that the bending strength increases as the cement ratio to the aggregate increases, but is almost saturated at 30% or more, while the water retention decreases as the cement ratio increases. When the cement ratio is around 15% by weight, it is recognized that both the bending strength and the water retention can be achieved at a good level.

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

Claims (3)

A paving material comprising an aggregate in which porous granulated slag particles and fine crushed stone are mixed, and Portland cement as a binder,
Compounding ratio of the crushed stone and the slag particles in the aggregate, by weight, said slag particles from 90 to 50%, the crushed stone Ri 10-50% der,
The particle size of the crushed stone is 20 to 2.5 mm,
The Portland cement is mixed in a weight ratio of 15 to 30% with respect to the aggregate,
A pavement material having a bending strength of 3.44 to 8.17 (N / mm ² ) and a water retention amount of 0.15 to 0.30 (g / cm ³ ) . The paving material according to claim 1, wherein the granulated slag particles have a particle size of 5 mm or less. A paving block comprising the paving material according to claim 1 or 2 formed.

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