JPH0443953B2 - - Google Patents

Description

[Detailed description of the invention]

Industrial Application Field The present invention mainly uses CaO, Al ₂ O ₃ , Fe ₂ O ₃ and SiO ₂ obtained by burning factory waste, especially waste from sugar refineries, rubber tire manufacturing plants, and their recycling plants. This invention relates to a hydraulic ground reinforcement improvement material that uses a fired material contained as a component as a base material. Conventional Technical Background In recent years, with the development of methods for strengthening and improving soft ground, various soil improvement materials have been proposed, and some are commercially available. However, most of these soil improvement materials are based on cement and contain calcium, silica, magnesium, gypsum, or other hydraulic inorganic or organic materials; As a base material, those made of water glass and mixed with various hydraulic substances are used. On the other hand, in order to prevent pollution, the waste discharged from various factories is currently incinerated or otherwise disposed of as industrial waste in landfills or dumped at sea. Problems to be Solved by the Invention The present inventor has discovered that, as mentioned above, conventional soil conditioners use cement or water glass as a base material, which is not necessarily advantageous in terms of cost. In view of this, we focused on the emissions from various factories that are discarded as industrial waste, and as a result of examining the chemical composition of the burned products of these emissions, we found that some of these burned products can be used as base materials for ground reinforcement materials. The present inventors have discovered that there is something that can be used, and have come up with the present invention. That is, the present invention investigated the components of the burned waste from various factories and found that the burnt waste from sugar refineries, rubber tire manufacturing plants, and recycling plants contains CaO, Al ₂ O ₃ , Fe ₂ O. ₃ and SiO ₂ as the main components, and using such a fired material as a base material, various hydraulic substances involved in ground reinforcement are blended with it to create SiO 2 , SiO ₂ as the main components. Al ₂ O ₃ , Fe ₂ O ₃ , CaO, MgO, Na ₂ O
The object of the present invention is to provide at a low cost a hydraulic ground reinforcement improvement material containing K ₂ O and suitable for strengthening and improving soft ground. The present invention will be explained in detail below. Structure of the invention The feature of the present invention is that CaO, Al ₂ O ₃ , Fe ₂ O ₃ and
The base material is the sintered waste from sugar refineries, rubber tire manufacturing plants, and their recycling plants that contain SiO ₂ as the main component, as well as cement, gypsum, and lime as hydraulic substances, and if necessary, alumina sulfate. At least one selected from the group consisting of ferric sulfide, sodium chloride, and magnesium sulfate
SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ ,
The reason is that it contains CaO, MgO, Na ₂ O and K ₂ O as components. In addition, in the present invention, products containing the above-mentioned products may be obtained by mixing two or more types of fired products of the above-mentioned factory discharges, and in some cases, other types of factory discharges may be used. You may also mix baked products. In the present invention, the above-mentioned various hydraulic substances are added to the fired product of the above-mentioned factory waste as appropriate to suit the composition of Aritz or Veritz, based on the composition of the constituent minerals of the cement clinker shown in Table 1 below. It is selected and blended.

[Table] Incidentally, cement clinker is obtained by firing a mixture of each of the calcareous ores shown in Table 1 and clay minerals. Means for Solving the Problems The fired product of factory waste used as a base material in the present invention may be a factory waste containing CaO, Al ₂ O ₃ , Fe ₂ O ₃ and SiO ₂ as main components. . Such emissions include those from sugar refineries and rubber tire manufacturing and recycling plants. Two or more of these fired products may be used in combination. In addition, when using the above-mentioned fired product from the factory, care must be taken to ensure that it does not contain heavy metals based on Environment Agency Notification No. 13, or that it does not contain any heavy metals or that is below the emission regulation values. Next, Table 2 shows the results of an analysis of burned products from sugar refineries, rubber tire manufacturing plants, and recycling plants.

【table】

[Table] This is the correct value.
As shown in Table 2, the fired products of the above-mentioned two factories contain CaO, Al ₂ O ₃ , Fe ₂ O ₃ and
Contains SiO ₂ as a main component. In the present invention, the fired product of these factory wastes is used as a base material, and based on the composition of the cement clinker constituent minerals shown in Table 1, cement,
Addition and combination of a hydraulic substance made of gypsum or lime and, if necessary, at least one compound selected from the group consisting of alumina sulfate, ferric oxide, sodium chloride, and magnesium sulfate. SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ , CaO,
A material containing MgO, Na ₂ O, and K ₂ O as a component is used as a soil reinforcement improvement material. Incidentally, the content ratio of these components can be appropriately selected in consideration of the soil quality of the ground to which it is applied. The reason why a substance selected from the above various hydraulic substance groups is blended into the base material made of the fired product of the above factory waste is to perform a hydration reaction as shown in Table 1 in application to ground reinforcement. Calcium silicate is produced in the same way as cements containing Aritz and Berits to strengthen the bridges of so-called ettringite in soils derived from clay minerals.
This is then carried out to solidify the soil particles by promoting the bozolan reaction based on the ion exchange reaction of calcium ions (Ca ²⁺ ) generated by the hydration reaction of quicklime on the surface of the clay particles. That is, in the present invention, when the above-mentioned hydraulic substances are selectively blended and supplemented to the fired product of the above-mentioned factory waste and applied to the ground to cause a hydration reaction, the Similar to cements containing clinker, the soil is strengthened by solidifying soil particles. In addition to the above-mentioned hydraulic substances, the soil reinforcement improvement material according to the present invention also contains chlorides, chlorates, sulfates, aluminates, heavy carbonates, silicates,
Inorganic substances such as silicate, phosphate, hydrogen phosphate, and pyrophosphate may be optionally blended. Furthermore, it is also possible to mix steel or aluminum slag as a long-term reinforcement. The soil reinforcement improvement material according to the present invention can be applied to various construction methods for improving soft soil. In other words, in the replacement method in which soft soil is excavated and replaced with good quality soil, this improvement material is added together with good quality soil,
m) In the stable treatment method that performs surface treatment,
It is possible to apply the improved material in shallow layers using a dry spreading method, or furthermore, in the wet construction method for stabilizing deep layers of the ground, a method in which the improved material is dispersed in water and injected can be adopted. In addition, it can be widely used for shield construction methods, propulsion construction methods, back-fill construction methods such as tunnels, etc. In addition, the soil strengthening improvement material according to the present invention containing about 10% cement is effective in strengthening and improving soft ground made of soil containing humic substances derived from humic substances. Incidentally, when cement is used to improve soil quality containing humic substances, the humic substances produce insoluble calcium humate through hydration of the cement, which is deposited on the surface of cement particles and causes a hydration reaction of the cement. It is said that cement cannot be expected to have any effect on improving soil quality because it interferes with the soil quality. EXAMPLES AND EFFECTS OF THE INVENTION The present invention and its effects will be specifically explained below with reference to Examples. Example 1 This example shows an example in which a burnt product of sugar refinery waste is used as a burnt product of factory waste.
Various hydraulic substances were supplemented to the fired product from the refinery having the composition shown in Table 2 in the proportions shown in Table 3 below to obtain soil reinforcement improvement materials.

[Table] Sample No. 1 of each improved material obtained as described above
Table 4 shows the compositions of Samples 1 to 6.

[Table] Next, 10 to 15% by weight of each sample with the above composition was added to 1000 g each of organic silt clay and humus peat.
The results of investigating the increase in strength of the mixed specimen are shown below. The strength of each specimen was measured after it had been cured by immersing it in water at room temperature for 6 days.
The results are shown in Table 5.

[Table] As seen in Table 5, it can be seen that the improving material according to the present invention exhibits an excellent effect on strengthening the strength of organic silt clay and peat. Example 2 This example shows an example in which cement and gypsum are mixed as hydraulic substances into a mixture of the burned waste from a sugar refinery and the burned waste from a rubber tire manufacturing and recycling plant. It is something. A fired product from a sugar refinery similar to that used in Example 1, a fired product from a rubber tire factory and its recycling plant having the composition shown in Table 2 above, and cement and gypsum were mixed in the proportions shown below to prepare the ground. A reinforced and improved material was obtained. Ingredients Blend amount (g) Burnt product from sugar refinery 51.1 Burnt product from rubber tire manufacturing plant and its recycling plant 30.30 Cement 38.6 Gypsum 30 The composition of the improved material obtained as described above is shown in Table 6. That's right.

[Table] Next, the improvement material consisting of the above composition was mixed with Kasumigaura organic silt clay and humus, which are rich in organic matter such as humus soil, which is said to be less effective in improving soil quality when using ordinary voltant cement and lime. Table 7 shows the results of applying 15% by weight to each 1000g of soil and examining the increase in strength. In addition, the soil specimen was cured in water for 6 days, and
Humid air curing was performed for each day.

[Table] As seen in Table 7, it can be seen that the soil reinforcement improvement material of the present invention exhibits an excellent reinforcement improvement effect even on soil made of soil rich in organic matter. Example 3 This example illustrates a soil reinforcement improvement material applied to the injection method. Incidentally, the injection method is
It is used for shield construction method, propulsion construction method, underground construction method for tunnels, etc., and high strength is not required so much. This is a construction method that measures the stability of the ground, and is also used to instantaneously solidify highly water-containing ground in underground construction to enhance the water-stopping effect. Conventionally, this injection method uses a suspension type of cement mixed with bentonite and sodium silicate. Preparation of a ground improvement material for injection according to the present invention: A fired product from a sugar refinery similar to that used in Example 1 and a fired product from a rubber tire retreading factory similar to that used in Example 2 were mixed with various types at the compounding ratios shown in Table 8. A 20% solution of sodium silicate (water glass) No. 3 was mixed with a mixture of a hydraulic substance and water to obtain a ground improvement material for injection.

[Table] Used in the method.
Next, Table 9 shows the results of injecting each of the above-mentioned samples No. 1 to 6 into soft ground using the injection method to examine the state of increase in strength.

[Table] As shown in Table 9, each sample gels as an injection material in an extremely short period of time, so it is suitable as a so-called instant setting injection material. If it is desired to delay the gelation time of the injection material a little more, use desulfurized gypsum or phosphate gypsum in place of the gypsum in Table 8, and the gelation time will be delayed by about 30 seconds to 1 minute. The strength is also slightly higher. Furthermore, in the present invention, a burned product of sludge discharged from a paper mill, a burned product of petroleum sludge, etc. can also be used by mixing with the above-mentioned base material.

Claims (1)

[Claims] 1. Burnt products of waste from sugar refineries, rubber tire manufacturing plants, and their recycling plants, which contain CaO, Al ₂
A base material containing O ₃ , Fe ₂ O ₃ and SiO ₂ as main components, at least one hydraulic substance selected from the group consisting of cements, gypsum and lime, and sulfuric acid as necessary. By blending a compound selected from the group consisting of alumina, ferric chloride, sodium chloride, and magnesium sulfate based on the constituent mineral components of cement clinker, SiO ₂ , Al ₂ O, Fe ₂ O ₃ , CaO , MgO and _K2
A soil reinforcement improvement material containing O as an ingredient.