JPS6223122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for paving stadiums or roads, particularly for improving the weather resistance (water damage resistance) of clay and silty clay.

Paving methods for facilities used for human movement and traffic, such as tennis courts and promenades, include an all-weather method in which the ground is covered with concrete, asphalt, synthetic resin, etc., a pulverized method in which the ground is covered with crushed powder of limestone, red brick, etc. A typical example is the clay method, which covers loam made of silt, clay, etc.

The all-weather method can be used literally regardless of the weather and requires little maintenance, so it has come to be used in competition facilities instead of the clay method, but it is hard and can have a negative impact on the human body. Also, due to the lack of natural feel, it has not been possible to fully pursue the clay method.

On the other hand, while the clay method has favorable properties from an athletic medical point of view, it has poor weather resistance, becomes particularly soft due to rainfall, cannot be used in winter due to frost melting, and does not dry out and turn into dust. There are some drawbacks in terms of use and management, such as the need to water properly.

However, the clay method is particularly attractive in that it provides a more natural feel than the all-weather method, so it is currently used despite the problems of maintenance and management.

The present invention focuses on the current situation and proposes a paving method that takes advantage of the advantages of the clay method while providing pavement that is excellent in weather resistance and easy to maintain.

In the present invention, 150% or more water by weight is added to clay or silty clay to form a suspension. Then, a mixture of a low-molecular water-soluble resin such as rubber latex or styrene monomer, sodium silicate, ferrous sulfate, etc. is added to this suspension in a weight ratio of 5% to 1%, and the mixture is thoroughly stirred. .
When the mixture precipitates after stirring, it is taken out and dehydrated using a filter press or the like until the moisture content of the precipitate is about 75% and then dried. The clay mixture thus obtained is applied to the ground, a paving base such as fine stones, etc.

The clay mixture is applied to the paving foundation using, for example, a paving machine (roller, etc.), and the appropriate coating thickness is, for example, about 2 to 5 cm in the case of sports facilities such as tennis courts.

The paved surface formed by the above method exhibits extremely high strength after solidification of the mixture, and exhibits excellent performance in that it hardly breaks or turns into dust even when subjected to impact such as exercise.

Furthermore, this paved surface did not dissolve even when left in water, and the water absorption rate of the sample after completely drying was approximately 40%, and no more water was absorbed. By adding water-soluble resins, sodium silicate, ferrous sulfate, etc. to clay, silty clay, it is possible to reduce the hydrophilicity without destroying the properties of the clay, and as a result, the solidity of clay particles achieved. The fact that it does not break down in water and has excellent water permeability also proves that it dries quickly after rain and can withstand use.

According to experiments, for clay and silty clay,
It was confirmed that when 2% of water-soluble resin, 2% of sodium silicate, and 1% of ferrous sulfate (each by weight) were added, the pavement surface could avoid water damage caused by rainfall and frost damage in winter. .

Furthermore, it was confirmed that even if ferrous sulfate was removed, almost the same weather resistance was exhibited. In addition,
If the content of these additives is less than 1%, the characteristics of clay will appear as they are, and weather resistance will decrease. Therefore, as mentioned above, it is most preferable to add within the range of 5% to 1%.

The elasticity of the paved surface according to the present invention is almost the same as that of the conventional clay method, so there is no risk of causing physical damage to the human body, and it is suitable as an exercise facility for tennis and the like. In addition, since its appearance is exactly the same as the conventional clay method, it is also suitable for uses such as promenades and bicycle paths where consideration is given to the natural environment.

As described above, according to the present invention, a pavement that is highly resistant to rain and frost damage and has high elasticity can be obtained.

Claims (1)

[Claims] 1 Clay, a suspension of silty clay and water,
Mix and stir while adding a water-soluble resin and sodium silicate at a weight ratio of 5 to 1% to the clay component, and then dehydrate the precipitate to about 75% moisture and coat the surface of the pavement foundation. A paving method characterized by: