JP3080288B2 - Paving material and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pavement material which can be constructed, has strength and scour resistance, and can be planted on a slope or a park such as a steeply inclined wall of a quarry, and its production. About the method.

[0002]

2. Description of the Related Art Generally, for example, 60 wt% of coarse aggregate and 30 wt% of fine aggregate are used on steeply sloping walls of roads and quarries to prevent falling rocks and landslides on slopes. 100% cement-mixed aggregate consisting of 10% by weight and 10% cement
A common cement concrete has been constructed, for example, in which 25% by weight of water is added.

[0003] Also, pavement materials obtained by mixing gravel or sand with petroleum asphalt for pavement have been applied to the above-mentioned places, parks and roads. On the other hand, many studies have been conducted on improving the particle size distribution of soil and stabilizing the soil as soil with cement, lime, bituminous materials, etc., but these studies mainly focus on various strengths of soil. It is.

[0004] For example, cement and water are added to and mixed with particle size-adjusted soil such as soil cement to increase the strength of the portion, or a relatively small amount of cement is added to and mixed with the soil.
It is centered on soil stability, such as cement-added soil to increase soil strength.

[0005]

However, when cement concrete is applied to protect steeply sloped walls, it exhibits excellent properties such as water resistance, scouring resistance and strength. However, there is no function such as heat conductivity, heat conductivity, and planting property, and the object cannot be sufficiently achieved in terms of environmental protection and disaster prevention.

[0006] Further, when the soil is set on a steeply inclined wall or the like in which the clay content of the soil is reduced and the water content of the soil is set to the maximum density, the soil has characteristics excellent in water permeability and plantability. However, there were problems such as insufficient strength and scour resistance. On the other hand, soil cement is a cement cement in which the strength is enhanced by injecting the cement milk into the embankment and the roadbed, and it is extremely difficult to uniformly inject the cement milk into a steeply inclined wall surface and the like. Therefore, even if the strength of the steeply inclined wall surface is increased, there is no planting property, so that there is a problem that the purpose of environmental conservation cannot be achieved.

The present invention relates to a material which has properties intermediate between cement concrete and soil in terms of strength, and also has properties of soil having air permeability, water permeability, scouring resistance, heat conductivity and plantability. And a method for producing the same.

[0008]

SUMMARY OF THE INVENTION The present invention provides a cement 0.5
20 to 40% by weight of water with respect to 100% by weight of cement-mixed aggregate powder consisting of 10.0% by weight and 90.0% to 99.5% by weight of aggregate powder containing 50% by weight or more of fine powder of 0.1mm or less. A pavement material characterized by the following. Also, a method for producing a pavement material, comprising curing the above-mentioned pavement material kneaded with a kneading machine for at least one time after curing the pavement material for at least one or two times to loosen the lump of the pavement material, and re-curing. .

[0009]

[Action] According to the present invention, cement is 0.5 to 10.0 wt%.
And aggregate powder containing fine powder of 0.1mm or less and 50wt% or more
Cement-mixed aggregate powder consisting of 90.0 to 99.5 wt% 100 wt
%, The water content is 20 to 40% by weight, so that the palladium material has increased fluidity due to the thixotropic effect of a large amount of fine powder, and the addition of cement promotes the hydration reaction of cement. By increasing the strength, on the other hand, excess moisture more than the moisture required for the hydration reaction of cement stays between the particles, the fine particles become gel, and appropriate water permeability and plasticity are obtained, so planting is possible. Become.

[0010] The reason for limiting the cement content to 0.5 to 10.0 wt% is that if it is less than 0.5 wt%, the strength characteristics are insufficient and scouring resistance is poor, and if it exceeds 10.0 wt%, plantable plasticity is obtained. It is not possible. The reason why the fine powder having a particle size of 0.1 mm or less in the aggregate powder is set to 50 wt% or more is that there is not much in the natural powder, and it is not economical to produce artificially.

The reason that water is limited to 20 to 40 wt% with respect to 100 wt% of cement-mixed aggregate powder is that if it is less than 20 wt%, plantability and water permeability deteriorate, and if it exceeds 40 wt%, solidification is insufficient. This is because scour resistance deteriorates. After curing the pavement material kneaded with the kneading machine for 2 to 3 days, it is possible to prevent the solidification of the material by holding the pavement material at least once to loosen the lump of the pavement material and curing it again. In the age of the material, a porazone reaction occurs in the material, a dense insoluble hydrate is generated on the surface of the particles of the material, and the bonding force between the particles increases, so that the strength of the material increases and crushing becomes difficult, After curing the pavement material for at least two or three days, it is possible to prevent the material from being excessively hardened by holding the pavement material at least once and loosening the mass.

[0012]

Embodiments of the present invention will be described below with reference to tables and drawings. First, one embodiment of the present invention will be described. 100 wt% cement mixed slag consisting of 5 wt% Portland cement and 95 wt% slag as aggregate powder
% Of the pavement material containing 28% by weight of water was kneaded with an Erich mixer for 10 minutes to obtain a sample 1a of the embodiment. A sample 1b was prepared by kneading 2 tons of pavement material containing 28% by weight of water with respect to 100% by weight of slag using an Erich mixer for 10 minutes.

The slag used in this embodiment is a slag obtained by refining a gold mine by a total mud-blueing refining method.
₂ is about 85 wt%, and the particle size is
%, 5.9% for 0.074mm to 0.105mm, 93.6% for less than 0.074mm
It is. In another embodiment of the present invention, granulated blast furnace slag composed of 80% by weight of granulated blast furnace slag, 19% by weight of gypsum, 1% by weight of slaked lime, 5% by weight of cement, and 95% by weight of slag
30 wt% water for 100 wt% of cement mixed slag consisting of
% Of the pavement material containing 2% was kneaded with an Erich mixer for 10 minutes to obtain a sample 2a, and water was added to 100% by weight of a cement-mixed slag composed of 10% by weight of blast-furnace granulated slag composition cement and 90% by weight of slag. Sample 2b was prepared by kneading 2 tons of pavement material containing 30 wt% for 10 minutes with an Erich mixer.

The kneaded sample 1a, 1b, sample 2
a and 2b are formed into two cylinders each having a diameter of 5 cm and a height of 5 cm to form A and B.
After curing for 28 days, the samples were subjected to a compressive strength test, and the results are shown in Table 1.

[0015]

[Table 1]

As is clear from the table, in the samples 1a and 1b, the strength hardly changes even after 3 days from the kneading.
After a lapse of days, the strength of sample 1b slightly increased.
After 28 days, the strength of both samples 1a and 1b increased about twice. In samples 2a and 2b, the strength did not change 3 days after kneading, but after 7 days, the strength was about 1.6 times, and after 28 days, 4.24 times.

Next, a water permeability test was performed on Sample 2a. For the water permeability test, two iron cylindrical containers having a diameter of 54 cm and a depth of 85 cm were prepared, and on one side, the sample 2a was squeezed with a sufficiently thick wooden rod to a thickness of 65 cm.
Tap water was supplied from above into each of the containers obtained by lightly squeezing a to a thickness of 65 cm while maintaining a constant water level, and the amount of permeated water discharged from the bottom of the containers was measured.

As a result, when the sample 2a is sufficiently compacted,
Has a water permeability of 6.2 × 10 ^-7 (cm / s), and the water permeability of sample 2a when compacted lightly is 1 × 10 ^-5 (cm / s), which is the optimum water permeability for general tree growth. The coefficient is close to 1 × 10 ^-4 (cm / s), which is sufficient for growing trees. Next, the scourability test of the sample of the present invention will be described below. First, a scouring resistance test method is shown in FIG.

Samples 1a, 1b, 2a, and 2b were squeezed at a height of 60 cm at an inclination of 60 degrees to produce a slope 1, and L. A running water gutter 2 is provided at a height of 70 cm from 25 below L
A pit 3 of cm was provided. Next, a specified amount of water is supplied from the running water gutter 2 to G.W. It was allowed to flow down the slope 1 having a height of 50 cm from L.

The sample scoured by the flowing water and deposited in the lower pit 3 was dried and its weight was measured. Table 2 shows the test conditions and results. In addition, the test result of the compacted shirasu soil of the conventional example was also described for comparison.

[0021]

[Table 2]

As apparent from the test results, Sample 1
a, 1b and samples 2a, 2b
Scour resistance was much better. In the planting test of the sample of the present invention, a part of the place filled with the pavement material 4 of FIG. 2 was sectioned, and planting sites were formed using the samples 1a, 1b, 2a, and 2b, and each of them was formed. Planting was performed on three types of trees, tree, tree and shrub.

The results of the planting test are shown in Table 3. The pavement material of the present invention showed excellent planting properties.

[0024]

[Table 3]

Next, in the method for producing a pavement material of the present invention,
When these paving materials are stocked in the product yard after kneading, the strength does not change much in the case of 3 days after kneading,
After 7 days, the strength of the pavement with granulated blast furnace slag cement increases, and after 28 days, the strength increases to a level where the strength is doubled. You need to carry it.

If the work is neglected and the curing is carried out for more than 7 days without holding the pavement, the pavement material solidifies and it becomes difficult to excavate and pulverize using only heavy equipment. Next, the pavement material 4 of the present invention is used as a reinforcing material for the slag embankment 5 and the sediment embankment 6 of the slag accumulation site shown in FIG. The slope was formed by holding it with a shovel car basket to prevent scouring by rainwater.

One year later, the engineering characteristics of the construction body (the degree of compaction of the soil, mechanical characteristic values, strength characteristics of the embankment material, etc.)
Physical properties (specific gravity, water content, liquid property limit, plastic limit) were investigated. In the investigation, test drilling was performed at two locations of No. 1 and No. 2 holes shown in Fig. 2 together with the standard penetration test.
The N value was measured, and a sample was taken by a test pit excavation so as not to disturb the existing embankment, and a general physics and triaxial compression test was performed using the sample.

In addition, a compaction test was conducted using the collected sample to clarify the mechanical properties of the pavement material obtained by adding cement to slag. In the test boring described above, a depth of 1.0 m
A standard penetration test was conducted every time.
Paving material 1 was distributed at a depth of 11.5m at No.2 hole. The N value at the measurement location was determined by this standard penetration test.

The N value between 1.5 m and 2.5 m below the uppermost portion is N = 8-9, which is 10 or less, but the N value is 10 or more at a deeper place. The average N value at No.1 hole is 14.6 N
o.2 The average N value at the hole point is 21.0, and the strength of the pavement material 1 can be further increased depending on the elapsed time after construction and the construction management method.

Table 4 shows the relationship between the N value and the hardness of the soil.

[0031]

[Table 4]

Next, the results of a compaction test using the sample taken at No. 1 hole are shown below. (1) The specific gravity of soil particles is 2.69, similar to that of general soil. (2) The natural water content was 34.3-40.1%. (3) Moisture content of liquid limit (LL) = 45.7-50%, plastic limit (PL)
(4) Strength C in triaxial compression test C = 10-18.7 tf / m ² (5) Compaction test The maximum dry density was 1.368 t / m ³ , and the optimal water content was 29.8%.

Strength C in triaxial compression test C = 10-18.7 tf
Since the N value of the ground corresponding to / m ² is considered to be ground of about 8 to 10, it is assumed that the pavement material at the survey site is distributed with a higher strength. As a result of the tamping test, the optimum water content is 29.8% and the natural water content is 34.3-40.1% .However, at this stage, it is not necessary to increase the N value any more. It is unnecessary.

Although the measured N value varies between points and also in the depth direction, the pavement material of the present invention can be sufficiently used.
In addition, the pavement material of the present invention, besides steep slopes and slopes, even on flat ground, forms a waterway at the time of rainfall, such that the soil in the waterway is washed away and the soil in the surface layer is scoured. It is also applicable to places such as parks.

[0035]

As described above, by applying the pavement material of the present invention to a slope such as an inclined wall, there is no outflow of the pavement material due to rainwater, and the protection surface of the slope such as the inclined wall is sufficient. It is constructed with strength and can be planted, so that protection of sloped walls and the like and greening can be sufficiently achieved.

Further, even on a flat ground, by applying the pavement material of the present invention, the soil on the surface of the flat ground is not washed away by rainwater.

[Brief description of the drawings]

FIG. 1 is a diagram showing a test method for scouring resistance.

FIG. 2 is a cross-sectional view in which a pavement material is constructed as a reinforcing material for a slag embankment at a slag accumulation site.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slope 2 Running gutter 3 Pit 4 Pavement material 5 Piling stone levee 6 Piling site dike

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 17/20 E01C ^7/ 10-7/16

Claims (2)

(57) [Claims] An aggregate powder containing 0.5 to 10.0 wt% of cement and 50 wt% or more of fine powder of 0.1 mm or less, 90.0 to 99.5 wt%.
100% by weight of cement-mixed aggregate powder consisting of
A pavement material characterized by containing 20 to 40 wt%. 2. The pavement according to claim 1, wherein the pavement material according to claim 1, which has been kneaded by a kneading machine, is cured for at least one time after curing the pavement material for at least one or two days to loosen a lump of the pavement material and re-curing. The method of manufacturing the material.