JPH11170244A - Method and apparatus for formulation/design/selection of high fluidity concrete, etc. - Google Patents

Abstract

PROBLEM TO BE SOLVED: To design a formulation easily and precisely by a method in which when the quality variation of a material is input in a practical plant and the results of trial kneading fall in a quality variation range, the quality after curing is compared with aimed performance, and when the quality is in the range of the aimed performance, the formulation is displayed. SOLUTION: Quality variation which affects the properties of a material, especially flesh concrete, used in a plant means the quantity of the surface water of fine aggregate. On the basis of the amplitude of the quality variation, a formulation is further corrected. The quantity of unit water, the addition of a separation reducing agent, the quantity of unit powder, the quantity of unit aggregate, and others are corrected. Trial kneading is repeated according to the correction, a formulation which meets all conditions is determined. When the results of comparison do not meet aimed strength, the kind and mixing ratio of the powder to be used again are changed. When the formulation meets all kinds of aimed performance, it is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for selecting a mixing design of highly fluid concrete or the like.

[0002]

2. Description of the Related Art Concrete and the like must satisfy certain conditions such as fluidity and filling property at the time of freshness and strength, heat generation property and durability after hardening. Design equations have been developed to design formulations that also meet such conditions. However, there are many uncertainties in practice,
It is difficult to obtain satisfactory quality as calculated.
For this purpose, a standard blend is temporarily determined, and trial kneading is performed according to the blend to determine whether or not the target performance is met.

[0003]

[Problems to be solved by the invention] In that case, it is necessary to repeat thought and error many times, but if the result is unsatisfactory, which item should be increased next or which item should be decreased? Whether it is good depends on the intuition and skill of a professional engineer, and the accuracy of the obtained result is low at present.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and does not require much intuition and skill, and can easily mix high-fluidity concretes and the like which satisfy all target performances. An object of the present invention is to provide a method and an apparatus for selecting a blending design of highly fluid concrete or the like, which can be designed with high accuracy.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, a method for selecting a blending design of high fluidity concrete or the like according to the present invention comprises inputting conditions of a structure such as concrete and setting a target of concrete or the like. Determine and display the performance to be performed, and display the mixing setting range such as the size and amount of coarse aggregate, the type and amount of powder, the unit water amount, the amount of fine aggregate, the amount of admixture, and the displayed settings Enter the set values according to the range, determine and display the standard mix from the above input results, compare the results of the trial kneading performed based on this standard formulation with the target performance, and When the target performances do not match, the increase or decrease of the item to be corrected is selected and displayed from the correction item table, the blending conditions are input again according to the displayed correction item, and the result of the trial kneading based on the determined blending condition again. And target performance If the result of trial mixing is within the range of the target performance, enter the quality variation of the material in the actual plant.If the result of trial mixing is within the range of the quality variation, And the target performance is compared, and when the result of trial kneading is within the range of the target performance, the composition is displayed, and the method of selecting the composition design of high-fluid concrete is characterized. is there.

[0006] Further, the mixing and designing apparatus for high-fluidity concrete of the present invention comprises means for inputting the condition of a structure such as concrete, means for determining and displaying a target performance of concrete or the like, A means for displaying a blending setting range such as dimensions and amount, powder type and amount, unit water amount, fine aggregate amount, admixture amount and the like, and inputting set values according to the displayed setting range, A means for determining and displaying a standard blend from the input result, a means for comparing the result of the trial kneading performed based on the standard blend with the target performance,
When the result of the trial kneading does not match the target performance, a means for selecting and displaying the increase or decrease of the item to be corrected from the correction item table, and a means for inputting the blending condition again in accordance with the displayed correction item, are determined again. Means for comparing the result of the trial kneading based on the blending conditions obtained with the target performance with the means for inputting the quality variation of the material in the actual plant when the result of the trial kneading is within the range of the target performance; When the result of kneading is included in the range of quality fluctuation, the means for comparing the quality after curing and the target performance, and when the result of trial kneading is included in the range of target performance, from the means for displaying the composition thereof It is characterized by a compounding and designing device for high fluidity concrete and the like.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the method and apparatus for selecting a blending design according to the present invention will be described below with reference to concrete, with reference to the drawings. The overall flow is shown in Table 1, and the operation at each stage will be described below. It should be noted that a material using blast furnace slag fine powder or fly ash other than cement can be designed using similar input, calculation and display devices.

[0008]

[Table 1]

<A> Structure condition input means. First, conditions of a structure to be constructed are input to a computer. For example, the density of reinforcements such as reinforcement is high or low density, the form of the form is complicated or simple, composite or ordinary RC structure, or unreinforced structure, less reinforcement The conditions are different for each structure such as mass concrete. Further, the following conditions differ depending on the concrete structure to be constructed. For example, the spacing of rebars, the amount of steel used, the longest flow distance of concrete, the gradient during concrete flow, the pumping height,
Pumping distance, difficulty of the shape of the mold, and the like. These conditions are input, and the results are classified into, for example, three stages as shown in Table 2.

[0010]

[Table 2]

<B> Target performance display means. The target performance of the concrete is classified and displayed based on the above condition input. As the target performance at the time of freshness, fluidity (slump flow value), filling property (U-shaped filling height), separation resistance (flow reaching 50 cm) and the like can be mentioned. Here, the U-shaped filling height means that concrete is filled in one of a U-shaped cylindrical body of a predetermined size, and the height of the concrete that has risen in the other U-shaped cylindrical body is measured and filled. This is a test method to determine gender.
The target performance after curing includes strength, heat generation characteristics, durability, and the like.

<C> Mixing condition input means. The following compounding conditions are assigned according to the three ranks classified by the above condition input. Maximum size of coarse aggregate, unit coarse aggregate volume, unit powder amount according to powder type (Portland cement, blast furnace slag fine powder, fly ash, etc.), unit water amount, unit fine aggregate volume, fine aggregate Rate. As described above, the blending conditions are determined according to the ranks classified according to the structural conditions and the target performance.
As shown in 4, 5, and 6, it is sufficient to apply numerical values as they are, and the operation is extremely simple.

[0013]

[Table 3]

[0014]

[Table 4]

[0015]

[Table 5]

[0016]

[Table 6]

Next, an admixture (a high-performance water reducing agent, a separation reducing agent,
AE auxiliary agent) and the amount thereof are set, and this amount is set within the use range indicated by the manufacturer in consideration of the types and amounts of the other materials described above.

<D> Standard composition display means. With the above process, the standard combination is temporarily determined and displayed.

<E> Comparison means. Trial kneading is performed based on the standard mixture displayed on the display means. Then, the result of the trial kneading is compared with the target performance at the time of freshness, but the result of the trial kneading rarely coincides with the target performance at one time.

<F> Correction item display means. If the results of trial kneading do not match the target performance, the blending must be corrected. However, as described above, this correction means has conventionally been based on the experience and intuition of a skilled engineer. However, in the means of the present invention, items to be selected and corrected from a table as shown in Table 7 can be displayed together with the increase / decrease symbols.

[0021]

[Table 7]

Therefore, the item to be corrected and its increase / decrease can be immediately determined without depending on experience or intuition.

<G> Means for adjusting blending conditions. The blending conditions are adjusted again according to the displayed correction items. In this case, since the correction item and its increase / decrease are known, the adjustment operation is extremely easy. In this way, trial kneading is performed again based on the blending conditions after the increase, decrease, and adjustment,
The result is compared with the target performance. Then, the blending conditions are adjusted again according to the instructed correction items, and gradually converge to the target conditions.

<H> Quality fluctuation condition input means. After the convergence to the predetermined value, the conditions for the quality fluctuation of the materials used in the actual plant are input. The quality variation that affects the properties of fresh concrete, especially in the materials used in the plant, is the amount of surface water of the fine aggregate. Based on the data of the range of such quality fluctuation, the composition is further modified. In this case, the unit water amount, the amount of the separation reducing agent added, the unit powder amount, the unit coarse aggregate amount and the like are corrected. A trial kneading is performed again in accordance with this correction, and the same comparison and correction as described above are performed to determine a composition satisfying all conditions.

<Re> Means for comparing quality after curing. A high-fluidity concrete kneaded with a composition satisfying the above conditions should satisfy the target strength. In order to confirm this point, a test for applying a compressive force, a tensile force, or the like to the sample after a predetermined period is performed, and the quality after curing is compared with the target performance. If the result of the comparison does not meet the target strength, correct the formulation such as changing the type and mixing ratio of the powder to be used again,
The process is repeated from the setting of the maximum size of the coarse aggregate and the unit coarse aggregate volume described in the above process. The composition is indicated when fresh and when all target performances after curing are satisfied.

[0026]

EXAMPLES Next, examples of modifying the composition will be described.

<A> Correction to converge to the target performance. Table 8 shows a process in which a technician who has no experience in selecting a blend gradually converges to a predetermined payout using the above-described correction table (Table 7).

[0028]

[Table 8]

For example, in the first blending, the fluidity was higher than the target range, the separation resistance was lower than the target range, and the filling property was lower than the target value. In that case, the modified N in Table 7
o. This corresponds to 12. Therefore, as shown in the column of the correction item, first, the amount of the water reducing agent added is reduced, then the unit water amount is reduced, the unit powder amount is reduced, and finally, the unit coarse aggregate amount is reduced. When a test was conducted using the thus assumed composition, the results shown in the second part of Table 8 were obtained. The results are shown in Correction No. It was equivalent to 14. Thus, in the case of the example, the test kneading was performed ten times, and the target performance at the time of freshness could be obtained.

<B> Correction due to quality fluctuation at the plant. The formulation that achieved the target performance was further modified taking into account the fluctuations in the surface water of the aggregate of the plant. The results are shown in Formulation Nos. 11, 12 in Table 9.

[0031]

[Table 9]

<C> Correction of compounding again. From the above results, Formulation No. Table 10 shows the results of the compounding correction performed again based on No. 10. Thus, the mixture No. 14
Was determined under the following conditions.

[0033]

[Table 10]

[0034]

As described above, the method and apparatus for selecting the composition of high-fluidity concrete according to the present invention, as described above, clarify the correction items after trial kneading using the composition correction table and the conditions for increasing and decreasing the correction items. I made it. For this reason, even a person with no skill or experience can clarify the order and direction of correction, and can efficiently and accurately converge to the target value without repeating unnecessary thinking and error.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yasunori Matsuoka 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (2)

[Claims] 1. The condition of a structure such as concrete is input, and the target performance of concrete or the like is determined and displayed. The size and amount of coarse aggregate, the type and amount of powder, the unit water amount, the fine aggregate Display the setting range such as the amount of admixture, the amount of admixture, etc., input the set value according to the displayed setting range, determine and display the standard formulation from the above input results, and based on this standard formulation The result of the trial kneading performed is compared with the target performance. If the result of the trial kneading does not match the target performance, the increase or decrease of the item to be corrected is selected and displayed from the correction item table, and the displayed correction item is displayed. The trial mixing results based on the determined blending conditions are compared again with the target performance.If the trial mixing results fall within the target performance range, the material mix in the actual plant is Quality fluctuation If you force, when the trial kneading results are within the scope of the quality variation, compared with the quality of the cured and target performance, try kneaded result is included in the range of target performance,
A method for selecting a mix design for high-fluidity concrete, etc., characterized by displaying the mix. 2. A means for inputting conditions of a structure such as concrete, a means for determining and displaying a target performance such as concrete, a size and amount of coarse aggregate, a type and amount of powder, and a unit water amount. Means for displaying the setting range of the amount of fine aggregate, amount of the admixture, etc., and means for inputting the set values according to the displayed setting range; means for determining and displaying the standard compounding from the above input results And a means for comparing the results of the trial kneading performed based on this standard formulation with the target performance. If the results of the trial kneading do not match the target performance, select from the correction item table the increase or decrease in the items to be corrected. A means for inputting the blending conditions again according to the displayed correction items; a means for comparing the trial kneading result based on the determined blending conditions again with the target performance; Goal Means for inputting the quality variation of the material in the actual plant when included in the range, and means for comparing the quality after curing and the target performance when the result of the trial kneading is included in the range of the quality variation. , If the result of trial work is within the target performance range,
A mixing design selection device for high-fluidity concrete, etc., composed of means for displaying the mixing.