JP4157793B2 - Component measurement method for mixtures of bentonite mixed soil, cement improved soil, etc. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a bentonite mixture that can measure the mixing rate and amount of cemented soil used in the foundation ground construction of roadbeds, buildings and civil engineering structures, etc. The present invention relates to a method for measuring components of a mixture of soil, cement improved soil, and the like.
[0002]
[Prior art]
Conventionally, for bentonite mixed soil, the "methylene blue solution adsorption test" that measures the amount of adsorbed methylene blue pigment and measures the mixed amount of bentonite, and the funnel that measures the viscosity of mud water in which the mixed soil is dissolved and measures the bentonite mixed amount Viscosity test ". As for the cement-improved soil, there is a “method for measuring cement amount of cement-stabilized mixture by titration method” (KODAN 207) in which the amount of cement mixed is measured from the titration of sodium hydroxide solution.
[0003]
[Problems to be solved by the invention]
The measurement by the conventional methylene blue solution adsorption test has a long measurement time of one day to one and a half days, and the quality control of the mixture cannot be performed quickly. There are many equipments used for testing, and there is a disadvantage that they are not suitable for on-site work.
In addition, the measurement by the funnel viscosity test is a simple test method and is a field-oriented test method, but the measured value may vary depending on the skill level of the test, and the analysis result varies depending on the properties of the raw soil. There were drawbacks.
Furthermore, the measurement by the cement amount test method of the cement stable treatment mixture by the titration method has a drawback that the measurement method is complicated and requires skill, and the measurement time is long and the quality control cannot be performed quickly.
[0004]
In view of the conventional drawbacks as described above, the present invention can minimize the artificial measurement error by performing the quality control of the mixing amount using the electrical conductivity as an index, and the solvent such as methanol, ethanol, etc. The use of alcohol-based solvents and salt water stabilizes the measured values, ensures high reproducibility, and simplifies the test itself, reducing analysis time compared to conventional methods. It is an object of the present invention to provide a method for measuring components of a mixture such as bentonite mixed soil and cement improved soil.
[0005]
The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a solvent electrical conductivity measurement step for measuring the electrical conductivity of the solvent, and a mixture dissolution step for dissolving a mixture such as bentonite mixed soil and cement improved soil to be measured in the solvent. In the step of measuring the electric conductivity of the solution obtained in the step of dissolving the mixture, the step of measuring the electric conductivity of the solution, the value obtained in the step of measuring the electric conductivity of the solution, and the step of measuring the electric conductivity of the solvent. In the method for measuring the components of a mixture of bentonite mixed soil, cement improved soil, etc., by calculating the mixing rate of bentonite, cement, etc. from the measured values obtained, the amount of bentonite in the mixture to be measured If it is mixed is made from methanol, alcohol solvents such as ethanol, if cement is mixed with brine bentonite mixed soil Constitute a component measuring method of a mixture of cement improved soil like.
[0007]
The present invention also includes a solvent electrical conductivity measurement step for measuring the electrical conductivity of the solvent, a heating step for heat-treating a mixture such as bentonite mixed soil and cement improved soil to be measured, and after or before this heating step. The fine particle process for making the mixture fine, the mixture dissolving process for dissolving the mixture treated in the heating process and the fine particle process in the solvent, and the electric conductivity of the solution obtained in the mixture dissolving process From the electrical conductivity measurement step of the solution to be measured, the measurement value obtained in the electrical conductivity measurement step of this solution and the measurement value obtained in the electrical conductivity measurement step of the solvent, the mixing ratio of bentonite, cement, etc., mixing amount or bentonite mixed soil, characterized by comprising a calculation step of calculating, in component measurement method of a mixture of cement improved soil, etc., said solvent mixture to be measured If bentonite is mixed made from methanol, alcohol solvents such as ethanol, if cement is mixed constitutes bentonite mixed soil, a component measurement method of a mixture of cement improved soil or the like with brine .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
[0009]
In the first embodiment of the present invention shown in FIGS. 1 to 13, as shown in FIG. 2, reference numeral 1 denotes a mixture 2 such as bentonite mixed soil and cement improved soil to be measured. In this embodiment, the heating process 1 is performed by heating and drying with a heating device 3 including a microwave oven. In the heating process 1, for example, 200 g of the mixture 2 is heated with the heating device 3 (microwave oven {strong}) for about 15 minutes. Do it.
[0010]
3, 4 is a fine-grain process in which the mixture 2A heat-treated in the heating process 1 is passed through a sieve 5 to obtain a fine-grain mixture 2B. In this fine-grain process 4, for example, 2.0 mm The mesh sieve 5 is used and the mixture 2A remaining in the sieve 5 is crushed as necessary. Thereby, the fine granular mixture 2B can be uniformly dissolved in the solvent 6 to be described later, and it is possible to avoid problems that cause variations in the measurement of the mixing ratio and the like.
[0011]
7, as shown in FIG. 4, a solvent 6 made of an alcoholic solvent such as methanol or ethanol, a salt water or the like in which the mixture 2B is dissolved (in the case where bentonite is mixed in the mixture 2B, such as methanol or ethanol). In the step of measuring the electrical conductivity (α) of the solvent to measure the electrical conductivity (α) of the alcohol solvent and the mixture 2B when the cement is mixed, the electrical conductivity measurement step 7 of this solvent performs the measurement. The solvent 6 is weighed into the container 8 with a weight measuring instrument 9 (for example, 280 g when the solvent is methanol, 360 g when the solvent is salt water), and stirred with the stirrer 10 using a magnetic stirrer, and then an electric conductivity meter. In the present embodiment, an electric conductivity measuring unit 11 including an electric conductivity meter is used.
[0012]
As shown in FIG. 5, a predetermined amount (5% with respect to the solvent) of the mixture 2 </ b> B is measured with the weight measuring device 9 after the electric conductivity measurement step 7 of the solvent, and the solvent 8 in the container 8 is measured. In the mixture dissolving step, the mixture dissolving step 12 is made to dissolve in the solvent 6 by stirring the mixture 2B using the stirrer 10. In the present embodiment, the stirrer 10 is configured with a magnetic stirrer. However, the present invention is not limited thereto, and may be configured with a shaker or the like.
[0013]
As shown in FIG. 6, 13 is a step of measuring the electric conductivity of the solution, in which the electric conductivity (β) of the solution 14 in which the mixture 2B is dissolved in the mixture dissolving step 12 is measured. Step 13 is performed using the electric conductivity measuring means 11.
[0014]
7, bentonite is obtained from the measured value (α) obtained in the electrical conductivity measurement step 13 of the solution and the measured value (β) obtained in the electrical conductivity measurement step 7 of the solvent, as shown in FIG. The calculation step 15 is performed by the calculation means 16 using data analysis software or the like incorporated in the electrical conductivity measurement means 11. In the present embodiment, the calculation unit 16 incorporated in the electrical conductivity measurement unit 11 performs the calculation step 15; however, the present invention is not limited to this, and the electric conductivity measurement step of the solution. Separately using the measurement value obtained in step 13 and the measurement value obtained in the electric conductivity measurement step 7 of the solvent, the operator uses a computing means such as a calculator to mix the bentonite, cement, etc. You may make it calculate by calculating.
[0015]
The electric conductivity measuring means 11 used in the electric conductivity measuring step 7 of the solvent and the electric electric conductivity measuring step 13 of the solution is connected to the sensor unit 17 and the sensor unit 17 which are put in the container 8. The measurement unit 18 and a display unit 19 provided in the measurement unit 18 for displaying measurement values and the like are configured.
[0016]
The component measuring method of the mixture of bentonite mixed soil, cement improved soil and the like having the above-described configuration is performed in a short time and accurately because the mixing amount and mixing rate of the bentonite and the like in the mixture 2 are performed using the electrical conductivity measuring means 11. In addition, since the measurement operation is made uniform, an effective measurement operation can be performed without relying on the intuition or register of an expert.
[0017]
In addition, the numerical value shown below was obtained as a result of the test about the relationship between the mixing rate of the bentonite etc. in the said mixture 2, and the electrical conductivity of a solvent, and the electrical conductivity of a solution. Hereinafter, the cases will be described separately.
(1) When the mixture 2 consists of soil and bentonite (BT),
As shown in FIG. 8, the electric conductivity of the solvent (for example, methanol) was measured to be 0.014 ms / m. Further, when the mixing ratio of bentonite to soil (hereinafter referred to as “X”) is 0%, 5%, 10%, 15%, and 20%, the electrical conductivity of each solution is such that X is 0%. 0.283 ms / m for 5%, 0.353 ms / m for 10%, 0.692 ms / m for 10%, 1.052 ms / m for 15%, 1.230 ms / m for 20% m.
From the above, when the mixture 2 is composed of soil and bentonite, it was confirmed that when an alcohol solvent (for example, methanol) is used as the solvent, bentonite is dissolved in the solvent as shown in FIG. Moreover, when X is 0 to 5%, no increase in electrical conductivity is observed, but this can be considered to be caused by the electrical resistance of the soil itself. On the other hand, when X is 5% or more, the electrical conductivity increases as the mixing ratio increases. Thereby, it was confirmed that the mixing rate etc. of the mixture 2 in case X is 5% or more can be specified.
(2) When the mixture 2 consists of sand and bentonite,
As shown in FIG. 10, the electric conductivity of the solvent (for example, methanol) is 0.014 ms / m as in the case (1). Further, when the mixing ratio of bentonite to sand (hereinafter referred to as “Y”) is 0%, 5%, 10%, 15%, and 20%, Y is 0% for the electrical conductivity of each solution. 0.351 ms / m for 5%, 0.870 ms / m for 10%, 1.350 ms / m for 10%, 1.667 ms / m for 15%, 2.090 ms for 20% / M.
From the above, when the mixture 2 is composed of sand and bentonite, using an alcohol solvent (for example, methanol) as the solvent, it is confirmed from FIG. 11 that bentonite is dissolved in the solvent as in (1) above. It was also confirmed that the sand itself has a low electrical resistance. Therefore, since the electrical conductivity increases as the mixing rate of bentonite increases, it was confirmed that the mixing rate of bentonite and the like can be specified by measuring the electrical conductivity of the solvent and the solution.
(3) When the mixture 2 is made of soil and cement,
As shown in FIG. 12, when a solution obtained by adding salt to tap water was used as a solvent, the test was conducted with three types of salt water (1, 2) having different concentrations and a tap water for comparison. As a result, the following numerical values were confirmed. That is, when the electrical conductivity of each of the salt waters 1 and 2 is set to 50 ms / m (salt water 1) and 20 ms / m (salt water 2) (the electrical conductivity of tap water is 10 ms / m), the mixing ratio of cement to the soil The electrical conductivity in each solution (hereinafter referred to as “Z”) with 0%, 10%, and 20% was as follows.
A) In a solution in which the solvent is salt water 1, when Z is 0%, 49.40 ms / m, when 10%, 188.0 ms / m, when 20%, 267.0 ms / m.
A) In a solution in which the solvent is salt water 2, when Z is 0%, 21.10 ms / m, 10% is 148.9 ms / m, and 20% is 222.0 ms / m.
C) In a solution using tap water as a solvent, Z is 0. 19 ms / m when 10%, 134.0 ms / m when Z is 10%, and 193.8 ms / m when 20%.
From the above, it was confirmed that when the mixture 2 is soil and cement, the electrical conductivity of the solvent itself becomes constant by adding sodium chloride to the tap water as the solvent. Thereby, since the electrical conductivity of tap water can be adjusted, the management of the solvent can be facilitated. Further, as shown in FIG. 13, since the electrical conductivity increases as the cement mixing rate increases, the mixing rate of cement and the like can be specified by measuring the electrical conductivity of the solvent and the solution. It was confirmed.
[0018]
Different Embodiments of the Invention
Next, different embodiments of the present invention shown in FIGS. 14 to 16 will be described. In the description of the different embodiments of the present invention, the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and redundant description is omitted.
[0019]
The second embodiment of the present invention shown in FIGS. 14 and 15 is mainly different from the first embodiment of the present invention in that the solvent 6 and the solution 14 measured by the electric conductivity measuring means 11 are the same. The bentonite mixed soil for performing the calculation step 15A in that the calculation step 15A for calculating the mixing rate, the mixing amount, etc. of bentonite and cement is performed by the calculation means 16A using a computer with the measured electric conductivity. Even if the method for measuring the components of a mixture such as cement-improved soil is used, the same effects as those of the first embodiment of the present invention can be obtained.
[0020]
In the third embodiment of the present invention shown in FIG. 16, the main difference from the second embodiment of the present invention is that the solvent 6 is composed of an alcohol solvent such as methanol and ethanol, salt water, and the like. A container 8A in which the solvent 6 is put, a solvent supply means 20 for supplying a predetermined amount of the solvent 6 to the container 8A, and a heating device for heat-treating the mixture 2 such as bentonite mixed soil and cement improved soil added to the solvent 6 3A, a sieve device 21 for making the mixture 2A heat-treated by the heating device 3A fine, and a weight measuring instrument 9A capable of measuring a predetermined amount of the mixture 2B made fine by the sieve device 21; A stirrer 10A to be dissolved in the solvent 6, an electric conductivity measuring means 11A capable of measuring the electric conductivity of the solvent 6 and the electric conductivity of the solution 14, and the electric conductivity Component measuring apparatus for a mixture of bentonite mixed soil, cement improved soil, etc., comprising calculating means 15A for calculating the mixing ratio, mixing amount, etc. of bentonite and cement from the measured values of solvent 6 and solution 14 measured by measuring means 11A 22 is used to calculate the mixing rate, mixing amount, etc. of bentonite, cement, etc., and the bentonite mixing soil, cement improvement using the component measuring device 22 of such a mixture of bentonite mixing soil, cement improved soil, etc. Even if the method for measuring the components of a mixture such as soil is performed, the same operational effects as those of the first embodiment of the present invention can be obtained, and the apparatus is unitized, so that the measurement work can be performed efficiently. . In this case, work in each device / means is centrally managed by the control means 23.
[0021]
In each embodiment of the present invention, the mixture 2 for measuring components has been described for bentonite mixed soil, cement-modified soil, and the like. However, the present invention is not limited to this, and may be widely used for measuring components such as mixed soil. Good.
[0022]
【The invention's effect】
As is clear from the above description, the present invention has the following effects.
[0023]
(1) Obtained in the step of measuring the electric conductivity of the solvent, the step of measuring the electric conductivity of the solvent, the step of dissolving the mixture of bentonite mixed soil, cement improved soil, etc. to be measured, and the step of dissolving the mixture From the measured value obtained in the step of measuring the electrical conductivity of the solution, the measured value obtained in the step of measuring the electrical conductivity of the solution, and the measured value obtained in the step of measuring the electrical conductivity of the solvent, bentonite, In the component measuring method of a mixture of bentonite mixed soil, cement improved soil, etc., characterized in that it comprises a calculation step for calculating the mixing ratio, mixing amount, etc. of cement, etc., the solvent is mixed with bentonite in the mixture to be measured If it is methanol, made an alcohol solvent such as ethanol, because if the cement is mixed with water, an indicator the electrical conductivity Bentonite, it can control the quality of the mixing amount of the cement.
Therefore, an artificial measurement error can be minimized.
[0024]
(2) The component measurement of the mixture can be easily performed by (1).
Therefore, since no skill is required for the measurement, anyone can easily perform the measurement work, and the measurement time can be significantly shortened as compared with the conventional method.
[0025]
(3) According to the above (1), since the configuration is simple, it can be easily implemented.
[0026]
( 4 ) According to the above (1), by using an alcohol solvent such as methanol or ethanol or salt water as the solvent, the measurement value can be stabilized and high reproducibility can be ensured.
[0027]
(5) In claim 2, the same effects as in the above (1) to (4) can be obtained.
[Brief description of the drawings]
FIG. 1 is a process diagram of a first embodiment of the present invention.
FIG. 2 is an explanatory diagram of a heating process according to the first embodiment of this invention.
FIG. 3 is an explanatory diagram of a fine grain process according to the first embodiment of the present invention.
FIG. 4 is an explanatory diagram of a process for measuring electric conductivity of a solvent according to the first embodiment of this invention.
FIG. 5 is an explanatory diagram of a mixture dissolving step according to the first embodiment of the present invention.
FIG. 6 is an explanatory diagram of a step of measuring the electric conductivity of the solution according to the first embodiment of the present invention.
FIG. 7 is an explanatory diagram of a calculation process according to the first embodiment of this invention.
FIG. 8 is an explanatory diagram showing the electrical conductivity and the like of a mixture of soil and bentonite.
FIG. 9 is an explanatory diagram showing the relationship between the mixing ratio of bentonite and electrical conductivity.
FIG. 10 is an explanatory diagram showing the electrical conductivity and the like of a mixture of sand and bentonite.
FIG. 11 is an explanatory diagram showing the relationship between the mixing ratio of bentonite and electrical conductivity.
FIG. 12 is an explanatory diagram showing the electrical conductivity and the like of a mixture of soil and cement.
FIG. 13 is an explanatory diagram showing the relationship between the mixing ratio of cement and electrical conductivity.
FIG. 14 is a process chart of the second embodiment of the present invention.
FIG. 15 is an explanatory diagram of a calculation process according to the second embodiment of this invention.
FIG. 16 is a schematic explanatory diagram of a third embodiment of the present invention.
[Explanation of symbols]
1: heating process, 2, 2A, 2B: mixture,
3, 3A: heating device, 4: granular process,
5: Sieve, 6: Solvent,
7: Step of measuring electric conductivity of solvent, 8, 8A: container,
9, 9A: weight measuring device, 10, 10A: stirrer,
11, 11A: Electrical conductivity measuring means,
12: Mixture dissolution step, 13: Step of measuring electric conductivity of solution,
14: Solution, 15, 15A: Calculation process,
16, 16A: Calculation means, 17: Sensor part,
18: measurement unit, 19: display unit,
20: Solvent supply means, 21: Sieve device,
22: Component measuring device for mixture of bentonite mixed soil, cement improved soil, etc.
23: Control means.

Claims (2)

A step of measuring the electric conductivity of the solvent to measure the electric conductivity of the solvent, a mixture dissolving step of dissolving a mixture of bentonite mixed soil and cement improved soil to be measured in the solvent, and a solution obtained in this mixture dissolving step. The electric conductivity measurement step of the solution for measuring the electric conductivity, the measurement value obtained in the electric conductivity measurement step of this solution and the measurement value obtained in the electric conductivity measurement step of the solvent, such as bentonite, cement, etc. In the method for measuring the components of a mixture of bentonite mixed soil, cement improved soil, etc., characterized in that it comprises a calculation step for calculating a mixing rate, mixing amount, etc. , when the solvent is mixed with bentonite in the mixture to be measured methanol, consists alcohol solvent such as ethanol, if cement is mixed bentonite mixed, which is a salt , Component measurement method of a mixture of such cement improved soil. A step of measuring the electric conductivity of the solvent for measuring the electric conductivity of the solvent, a heating step of heat-treating the mixture of bentonite mixed soil, cement improved soil, etc. to be measured, and the mixture into fine particles after or before this heating step A fine granule step, a mixture dissolving step for dissolving the mixture treated in the heating step and the fine granule step in the solvent, and an electric power of the solution for measuring the electric conductivity of the solution obtained in the mixture dissolving step Calculate the mixing rate, mixing amount, etc. of bentonite, cement, etc. from the conductivity measurement step, the measurement value obtained in the electrical conductivity measurement step of this solution, and the measurement value obtained in the electrical conductivity measurement step of the solvent bentonite mixed soil, characterized by comprising a calculation step of, in the component measurement method of a mixture of cement improved soil, etc., bentonite in the solvent, the mixture to be measured Mixed If are methanol, made an alcohol solvent such as ethanol, bentonite mixed soil if the cement is mixed, which is a salt, component measuring method of a mixture of cement improved soil like.

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