JPS59213806A - Paving material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in paving materials used for grounds such as athletic fields or outdoor playgrounds.

As the surface layer material of conventional Craigland, materials shown in Table 1 below are generally used. These surface materials dry out and become hard when the weather is sunny for a long time. If the surface soil is too hard, the impact exerted on the user's knees or the like will be too large and will have a negative impact on the user, or the user will be more likely to be injured if he or she falls. In addition, surface soil that changes too much in hardness from softening to hardening due to the weather is undesirable because the conditions of the ground are constantly changing.

Table 1 In view of the above circumstances, the inventors of the present invention continued to conduct intensive studies to develop a surface layer material that does not harden even when the weather continues to be sunny for a long period of time, and as a result, they have finally arrived at the highly effective present invention.

That is, the present invention provides a pavement material comprising Craigland surface material mixed with silica gel having a particle size smaller than 4 mesh in total dry weight ratio of 0.5 to 20.

is used. If the particle size is larger than 4 mesh, there are drawbacks such as the user being more likely to be injured when falling. The amount of silica gel to be used is 0.5 to 20 inches on a dry weight basis; if it is less than this, a substantial effect can be expected; Not on point.

The silica gel may be mixed into the Craigland surface material separately, or it may be done at the time of constructing the surface material on the ground.

As described above, the surface layer of Craigland, which is made of a surface material made by mixing silica gel with a certain amount of silica gel, exhibits remarkable effects in that it does not harden even when the weather continues for a long time, and its hardness hardly changes due to weather.

Such effects of the present invention are mainly due to the water absorbency of silica gel. Uchi silica gel has the property of absorbing and retaining a large amount of water, but this property is reversible; if the surrounding area dries, the water contained in the silica gel will evaporate, and if the surrounding area is wet, the silica gel will evaporate. Absorbs surrounding moisture. In this way, silica gel can repeatedly absorb and release moisture depending on the surrounding dryness. Surface soil mixed with silica gel is
Even if the weather continues to be sunny for a long time, the large amount of water contained in the silica gel evaporates in an appropriate amount, making it difficult to dry out and harden.

Surface soil mixed with silica gel also has the effects described below.

When ordinary Craigland experiences rainfall, water puddles form or a large amount of water is contained in the surface soil.
Even if the rain stops, you can't use it right away. Surface soil that is completely mixed with silica gel is ready for use immediately after rainfall because the silica gel in the surface soil quickly absorbs water on the ground if the amount of rainfall is small. Even if silica gel absorbs a large amount of water, it will not become rationalized, so the surface layer material mixed with silica gel will not become easy to rationalize.

Traditional Craigland construction is susceptible to rainfall.

When it rains, the surface soil has a high water content, so if construction is carried out in this condition, the surface soil will become rationalized and construction will become impossible. Surface soil with a high moisture content must be dried in the sun to a workable state before construction can be carried out. When rain and sunny weather occur in short intervals, the surface soil does not have enough time to dry, making construction difficult. However, by mixing silica gel into surface soil that has a high water content ratio, the silica gel rapidly absorbs water in the surface soil, and the surface soil quickly recovers to a water-containing state that allows construction. In this way, Craigland surface soil mixed with silica gel can also reduce construction loss due to rainfall.

In winter, if high fkK water is contained between the soil particles in the surface soil, frost is likely to occur2. However, in the surface soil mixed with silica gel, the silica gel absorbs the excess water between the soil particles, so frost is more likely to occur2. It also produces the effect of reducing K.

Generally, when the surface layer of Craigland dries, dust tends to be generated. However, as mentioned above, surface soil mixed with silica gel does not dry out easily, so it also exhibits a dust-proofing effect.

As described above, the pavement material of the present invention has many effects, but
When lime filler is mixed with silica gel into Craigland surface material, even more remarkable effects are exhibited. If ordinary Glue V Eveland surface material contains a large amount of water, it will lose its hardness and become soft, but when lime filler is mixed in, the soil will moderately solidify due to the ion exchange reaction and pozzolan reaction of the calcium in it.

The setting effect of lime filler is smaller than that of slaked lime or cement, so it is not too hard and is suitable as a setting material for grounds. By mixing approximately 5 to 25 volumes of lime filler into the surface layer material and appropriately coagulating the soil particles in the surface layer material, the decrease in hardness is small even in heavy rainfall, and the material does not become soft. It is possible to make difficult Craigland surface materials. By simultaneously mixing silica gel and lime filler with Craigland surface material, it is possible to create a Craigland surface layer that remains hard even during continuous sunny weather and that does not lose its hardness even in rain1. , volcanic sand and debris] Aggregate also has the property of absorbing and retaining water, and can be used to replace the sand in Craigland surface material.
If 91 is mixed with volcanic sand or light aggregate and used with silica gel, even more remarkable effects can be obtained.

Here, Craigland surface layer removal mixed with silica gel, which is a feature of the present invention, will be explained with reference to the experimental results of the present inventors.

Generally, the hardness of Craigland surface layer is measured by Broctor needle test. It is said that the appropriate broctor needle value obtained from the broctor needle test is within the range shown in Table 2. It is desirable for each ground to satisfy the range of broctor needle values shown in Table 2 regardless of the weather, but in reality, if the broctor needle value continues for a long time, the upper limit of the range is often exceeded. The surface coating mixed with the silica gel of the present invention is substantially capable of satisfying the upper limit of the broctor needle value shown in Table 2 regardless of the weather.

In addition, in Table 2, the broctor needle test is a cylindrical penetrating rod with a cross section H<V201nch, t 1/16
1 nch/, (7) The hardness of the penetrated part is indicated by the maximum value CUs of the penetration resistance value at that time when the penetration speed is 11 nch.

Next, embodiments according to the present invention will be described. In the indoor model experiment, as shown in Figure 1, one cut crushed stone was placed on the subgrade A.
A paved road 6) with a thickness of 5α is provided, and a 1
The surface layer C was paved to a thickness of 5 crn. The manufactured model was kept under normal usage conditions and left outdoors.

Examples The examples shown in Table 3 include a surface layer material in which crushed stone dust, loam, and Marukita soil are mixed in a volume ratio of 60:20:20, and crushed stone dust, loam, and Marukita soil are mixed in a volume ratio of 60:20:20. Add silica gel to the mixed soil, and add silica gel to the dry weight of the soil.
This is a comparison of the Broctor needle values of surface layer materials containing 3 parts to 0 parts. Broctor's dollar values were compared after 15 consecutive days of clear skies. Broctor needle value of surface material without silica gel mixed is 125Lbs
On the other hand, the Broctor needle value of the surface layer material mixed with silica gel was 83 Lbs.

Table 3 Example of Broctor needle value measurement results of Example 1 2゜ In the example shown in Table 4, 4 parts of silica gel was added to 100 parts of dry weight of soil for the surface layer material of masa soil alone and for masa soil. This is a comparison of the Broctor Needle values of the blended surface materials. Broctor needle values were compared after 15 consecutive days of clear skies.

The surface layer material without silica gel had a broctor needle value of 15 Lbs, whereas the surface layer material with silica gel had a bronchter needle value of 75 Lbs.

Example 3 In the example shown in Table 5, the dry weight of the entire silica gel was 1
This is a comparison of the Broctor needle values of surface layer materials containing 7 parts to 0.00 parts. Broctor needle value is
The values were compared after 12 consecutive days of clear skies. The Broctor needle value of the surface material without silica gel is 84.
In contrast, the Broctor needle value of the surface layer material mixed with silica gel was 42 Lbtt.

Table 5 Example of Broctor Needle Value Measurement Results of Example 3
A broctor needle of a surface layer material in which 7 parts of silica gel is added to 100 parts of the dry weight of soil to a mixture of a 5°:40:10 volume ratio of black soil, river sand, and lime filler with a surface layer material mixed with a 0 volume ratio. This is a comparison of prices. Broctor needle values were compared after 1281 fiJ of consecutive sunny days and after about 24 hours after rain. After 12 consecutive days of clear skies, the Broctor Needle value was 84 Lbs for the surface material that did not mix silica gel and lime filler, while it was 56 Lbs for the surface material that mixed silica gel and lime filler. . The Broctor Needle Value after rain was 25 Lbs for the surface material without silica gel and lime filler, while it was 4 Lbs for the surface material with silica gel and lime filler.
FIG. 2 shows the relationship between the Broctor's needle value of Examples 1 and 2.3, which was 3 Lbs, and the silica gel mixture H1. Similarly, the relationship between the water content ratio and the total silica gel mixture in Examples J-, 2, and 3 is shown in FIG. Implemented f111 from FIG.
, II: It can be seen that the effect of mixing silica gel is greater than in Example 3. Example from Figure 3]
It can be seen that the moisture content ratio of Samples 2 and 2 during drying is lower than that of Example 30 I-Nami 13. From this, the effect of mixing silica gel is dry N! It can be seen that the surface soil with a small water content ratio of +, :, II°j is large.

[Brief explanation of the drawing]

8 ■ Figure 1 ν is a cross-sectional view of the indoor model experiment, Figure 2 is the 1st floor of the experiment.
Figure 3 is a graph showing the relationship between the block needle value of IJ1, 2.3 and the amount of silica gel mixed, and the relationship between the water content ratio and the amount of silica gel mixed in Examples 1 and 2.3. A...roadbed, B...roadbed, C...
... Pavement material according to the present invention and conventional wound 11 filling material.

Claims (1)

[Claims] A pavement material characterized in that 0.5 to 20% by dry weight of silica gel having a particle size smaller than 4 mesh is blended with a Craigland surface material.