JPH0610305A - Method and composition for pavement - Google Patents

Abstract

PURPOSE:To form a pavement having high strength and excellent durability by keeping the advantage of soil pavement, such as lesser reflection and reflecting heat from pave face and no-problem with disposal of excavated soil. CONSTITUTION:A mixture of 200 pts.wt. cement and 2000-3000 pts.wt. soil, which are uniformly mixed, is further mixed with water necessary for about + or -10% water content on the basis of an optimal water content for the content on the basis of an optimal water content for the mixture, containing 15-20 pts.wt. inorganic hardener NSC, to obtain a paving composition. Water and cement milk are spread over the surface of roadbed to make it wet condition as needed and the paving composition is then placed over the wet surface of the roadbed and compacted.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a parking lot, a playground, a park,
Cycling course, promenade, natural road or driveway,
The present invention relates to a method for paving a general road such as a sidewalk, and a paving composition suitable for the method.

[0002]

2. Description of the Related Art Conventionally, asphalt pavement and concrete pavement, which are generally considered to have high durability, are often used to pave roads and the like. However, these pavements have the drawback of having a large amount of glare in the summer, so in places where comfort is important, such as parks and promenades, soil pavements that are permeable but have poor water permeability and can be walked comfortably are used. Was often adopted. Since such soil pavement uses soil material generated from the construction site, it does not necessarily require aggregates such as gravel and sand as in asphalt pavement and concrete pavement, so there is no problem of carrying out disposal of residual soil, There is an advantage that construction can be performed relatively easily regardless of the construction area.

Such conventional soil pavement has been carried out by scraping off the soil of the roadbed, mixing it with a binder, laying the mixed soil, leveling and sprinkling water, and then rolling.
However, while such soil pavement can be easily constructed, the strength of the pavement surface tends to be uneven, and therefore there is a problem that partial erosion and cracking are likely to occur, and in winter, the pavement surface due to frost and freezing. However, there is a drawback that deterioration of

[0004]

Therefore, the present invention retains the advantage of soil pavement that the reflection from the pavement surface and the reflected heat are small and there is no problem of waste soil disposal, and that the strength is large and the durability is excellent. It is intended to provide a paving method capable of forming a paved surface.

[0005]

In order to achieve the above object, the pavement method of the present invention is to uniformly mix 2000 to 3000 parts by weight of a soil material with 200 parts by weight of cement, and then mix the mixture. The amount of added water required to obtain a water content in the range of 10% above and below the optimum water content ratio and containing 15 to 20 parts by weight of the inorganic curing agent NSC is blended and uniformly mixed. To obtain a paving composition, and then spread the composition on a wet roadbed surface and level and compact it. In carrying out the pavement method of the present invention, it is preferable to use a method of spraying or applying water, cement milk, or the like on the roadbed surface in order to prepare a wet roadbed surface.

The paving composition used in the paving method of the present invention is composed of 200 parts by weight of cement and 20 parts of soil material.
15 to 20 parts by weight of a uniform mixture of 0 to 3000 parts by weight and 15 to 20 parts by weight of added water, which is the amount of added water required to have a water content in the range of 10% above and below the optimum water content ratio with respect to the mixture. It is obtained by uniformly mixing with the one containing the curing agent NSC.

The cement used in the paving composition of the present invention may be any suitable one such as Portland cement, blast furnace cement and alumina cement and is not particularly limited. Soil materials include sandy soil, cohesive soil, volcanic ash,
Anything such as shirasu and sludge can be used.

The compounding ratio of cement and soil material in the paving composition of the present invention is 2000 to 3000 parts by weight of soil material to 200 parts by weight of cement. , Is calculated as follows. That is, the optimum water content ratio for obtaining the maximum compaction density for the soil material is obtained in advance according to the method specified in JIS A-1210. On the other hand, from the actual water content of the soil material obtained by the preliminary test,
Calculate the weight of water that would be included in the scheduled batch mixture and subtract the calculated water content from the optimum water content to calculate the added water content. At this time, it is preferable to calculate the amount of added water with respect to the total amount of soil material and cement.

Since the amount of added water thus calculated includes the inorganic curing agent NSC, the net amount of water charged is the amount of the above-mentioned added water minus the amount of the inorganic curing agent NSC. The amount of added water can be adjusted within the range necessary to obtain a water content in the range of 10% above and below the optimum water content ratio of the obtained paving composition.
The amount of the inorganic curing agent NSC added is preferably 15 to 20 parts by weight with respect to 200 parts by weight of cement.

Such mixing of each material can be carried out by using an apparatus such as a fixed type or movable type mixer, for example, a concrete mixer. In addition, the mixing order is such that the soil material and the cement are first mixed uniformly, and then a predetermined amount of water and an inorganic curing agent NSC (NSC Chemical Industry Co., Ltd., for civil engineering) are added and mixed evenly. To do. The paving composition of the present invention thus obtained is a soft lump in a wet state and has no fluidity.

In the pavement method of the present invention, the above-mentioned pavement composition is carried to a predetermined construction site by a dump truck or the like, and if necessary, it is moistened by sprinkling water or applying cement milk. For example, using a leveling machine such as an asphalt finisher or the like, or by using manual work as required, the leveling is performed to a predetermined uniform thickness. Next, for example, a compacting machine such as a Macadam roller or a tire roller is used to perform initial and secondary compaction, and a final compacting is performed using a compacting machine such as a combined roller or a hand guide type roller. It is desirable that all of these rolling compactions are vibrationless compaction compactions.

[0012]

According to the pavement method of the present invention, it is possible to form a uniform pavement having excellent flatness as compared with the conventional soil pavement, and the compaction rate can be changed by changing the type of the compaction machine and the number of compaction times. The strength and water permeability of the paved surface can be adjusted freely. Moreover, not only does it show high strength immediately after the construction, but also the strength is improved over a long period of time and weathering hardly occurs. Therefore, it can be said that the method is suitable for constructing pavement surfaces such as parking lots and exercise facilities as well as roads.

[0013]

[Examples] 200 kg of cement and 2650 kg of sand and sand were put into a plant mixer and mixed for 1 minute, and then 350 kg of water mixed with 18 kg of NSC inorganic special curing agent NSC manufactured by NSC Chemical Industry Co., Ltd. was further added. Mix evenly for 3 minutes,
A paving composition A of the present invention was obtained.

The pavement composition A was applied to a subgrade surface which had been leveled evenly and compacted and then sprayed with water to prepare a wet state.
Is spread to a thickness of 10 cm, compacted to a thickness of 6 cm using a compaction machine, and the paving composition A is laid and spread in the same manner, and the entire thickness is rolled. Paving was performed so that the length was 12 cm. After that, water was lightly sprinkled, and after curing for 24 hours, a columnar body having a diameter of 5 cm and a height of 10 cm was cut out using a core machine to obtain a test sample after one day. A compressive fracture test was performed on this sample to determine the fracture strength kg / cm ² , and a similar test sample was further aged in the air in the room and subjected to compressive fracture after 3 days, 7 days, 28 days, and 56 days, respectively. A test was conducted to determine the breaking strength, and the results are shown in Table 1.

The inorganic special curing agent N used in the present invention
Instead of SC, commercially available cement-based hardening agent Solstar (B company, trade name), Hard Keep (C company, trade name) and Stein R (D company, trade name) were taken, each weighing 200 kg. In addition to being used in place of cement, 350 kg of water containing no curing agent was used as additive water, and comparative paving compositions B, C and D were obtained by the same operation as in the present invention. In addition, a commercially available cement hardening agent, Round Chemic (trade name, manufactured by E Co.) was used by dissolving 1 kg thereof in added water to obtain a paving composition E for comparison. These pavement compositions B, C, D and E were also paved by the same operation as in the present invention, and the test samples after 1 day were respectively obtained in the same manner, 1, 3, 7, 14, 28.
And the fracture strength after 56 days were determined. These results are also shown in Table 1.
Are also shown.

[0016]

[Table 1] Table 1 Breaking strength of various hardener-containing pavements (kg / cm ² ) ────────────────────────────── ────── PAVING COMPOSITION AB ^* C ^* D ^* E ^* ─────────────────────────────── ────Cure days 1 28.0 5.9 14.3 16.3 27.1 3 43.8 13.6 27.1 37.7 32.2 7 57.1 32.4 37.9 47.0 35.1 28 80.6 35.8 47.6 63.7 36.5 56 99.5 36.3 48.0 65.2 36.9 ────────────── ───────────────────── *: Comparative example

The test sample of the same shape, which was sampled at the same time as the test sample after 1 day, was subsequently cured in the air for 2 days in the room, and then placed in a freezer at -15 ° C for freezing for 24 hours. The operation of allowing to stand, then taking out into a room at 20 ° C., thawing naturally, and allowing to stand for 24 hours was repeated twice. Then, after 7 days, a compressive fracture test was performed to obtain the fracture strength, and the strength reduction rate was calculated by comparing with the fracture strength of a similar test sample that was aged in the air from 1 day to 7 days later. . Table 2 shows the results of examining the strength reduction rate due to freezing and thawing of the paving composition A of the present invention and the comparative paving compositions B, C, D and E in this manner.

[0018]

[Table 2] Table 2 Freeze deterioration resistance of pavements containing various curing agents (twice after 3 days) ──────────────────────────── ─────────Pavement composition AB ^* C ^* D ^* E ^* ───────────────────────────── ────── Fracture strength (kg / cm ² ) 7 days curing in air 57.1 32.4 37.9 47.0 35.1 Two freeze-thaw cycles 50.9 25.7 27.1 35.4 22.7 Strength reduction rate (%) 10.9 20.7 28.5 24.7 35.3 ────── ───────────────────────────── *: Comparative example

The test sample of the same shape, which was taken at the same time as the test sample after 1 day, was subsequently cured in the air for 19 days in the room, and then placed in a freezer at -15 ° C for freezing for 24 hours. The operation of allowing to stand, then taking out in a room at 20 ° C., thawing naturally, and allowing to stand for 24 hours was repeated 4 times. Then, after 28 days, a compressive fracture test was performed to obtain the fracture strength, and the strength reduction rate was calculated by comparing with the fracture strength of a similar test sample that was aged in the air from 1 day to 28 days later. . In this way, Table 3 shows the results of examining the rate of decrease in strength due to freezing and thawing of the paving composition A of the present invention and the comparative paving compositions B, C, D and E.

[0020]

[Table 3] Table 3 Freezing deterioration resistance of pavements containing various curing agents (4 times after 20 days) ──────────────────────────── ─────────Pavement composition AB ^* C ^* D ^* E ^* ───────────────────────────── ────── Breaking strength (kg / cm ² ) 28 days Curing in air 80.6 35.8 47.6 63.7 36.5 Freeze-thaw 4 times 77.0 28.4 35.7 51.2 24.5 Strength reduction rate (%) 4.5 20.7 24.9 19.6 33.0 ─────── ───────────────────────────── *: Comparative example

From the above results, it can be seen that the pavement obtained by the paving composition of the present invention has not only excellent compressive strength but also little deterioration due to freeze-thawing and excellent durability. .

[0022]

The pavement constructed by using the pavement composition of the present invention produces less natural reflection in the summer, which is a feature of conventional soil pavement, and makes use of the natural environment. Since soil is used, no waste soil is generated,
While maintaining the advantage that it is economical, it has not suffered from the disadvantages of conventional soil pavement such as surface deterioration and strength deterioration due to winter frost, and has significantly improved durability. Moreover, it is significantly stronger than the conventional soil pavement using cement, and it is possible to make a uniform and flat pavement and the construction efficiency is high, so only roads such as roads, sidewalks, cycling courses, promenades and natural roads can be used. Instead, it can be widely used for paving parking lots, sports fields, and open spaces such as parks.

Claims (3)

[Claims] 1. After mixing 2000 to 3000 parts by weight of a soil material to 200 parts by weight of cement, the mixture is required to have a water content in the range of 10% above and below the optimum water content ratio. Amount of added water is 15-20
A mixture containing parts by weight of an inorganic curing agent NSC is blended,
A paving method characterized by uniformly mixing to obtain a paving composition, and then laying the composition on a wet roadbed surface and leveling and compacting. 2. The paving method according to claim 1, wherein a wet roadbed surface is prepared by spraying or applying water or cement milk onto the roadbed surface. 3. 200 parts by weight of cement and 200 of soil material
0 to 3000 parts by weight of a homogeneous mixture, and 15 to 20 parts by weight of an inorganic system containing 15 to 20 parts by weight of added water, which is a water content in the range of 10% above and below the optimum water content ratio with respect to the mixture. A paving composition, which is obtained by uniformly mixing with a curing agent NSC.