JPH11114942A - Production of ultra-lightweight aggregate concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce ultra-lightweight aggregate concrete by preventing ultra- lightweight aggregate from excessively absorbing water, holding ultra-lightweight properties, and stabilized in quality. SOLUTION: A method for producing ultra-lightweight aggregate concrete is constituted of test stages (1)-(6) of a front process measuring the supply amt. of water to ultra-lightweight aggregate in an absolute dry state by a water absorbing test and calculating the max. value of the correction amt. of water added to kneading water and performing the trial kneading of ultra-lightweight aggregate concrete compounded with a predetermined amt. of the aggregate to determine the suitable value of the correction amt. of water added to the kneading water and further determining the suitable charging amt. of the kneading water therefrom and production stages (7)-(9) of a rear process immersing the compounded aggregate in an absolute dry state in a part of the suitable charging amt. of kneading water or introducing the same into a mixer and charging a part of kneading water to perform stirring or preliminarily infiltrating a part of kneading water into the aggregate to bring the aggregate to a stable low hydrated state after the elapse of a predetermined time and charging the remainder of kneading water and all of compounding materials to perform final kneading to produce ultra-lightweight aggregate concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of manufacturing ultralight aggregate concrete, and more particularly to the technical field of manufacturing ultralight aggregate concrete using an ultralight aggregate in a dry state.

[0002]

2. Description of the Related Art Ultra-light aggregates have a lower specific gravity and a higher porosity than ordinary artificial lightweight aggregates for structural use. State affects the workability and ultra-lightweight properties of ultra-light aggregate concrete (its fresh concrete). In particular, if the ultra-light aggregate absorbs enough water, its super-light weight will be impaired. An important issue is whether to manufacture ultra-light aggregate concrete. In the case of ultra-light aggregates, use in an air-dried state makes it difficult to grasp the water-containing state because the water-containing state fluctuates depending on the humidity of the outside air.
From a quality control point of view, it is considered that this is not advisable, and the best method is to use it in a dry state with no moisture content.However, if the dry state aggregate is used as it is, it will absorb water into the aggregate. Since the amount becomes excessive, the mixing water becomes insufficient, and it is necessary to solve the additional problem of managing the correction water amount of the mixing water.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems by using ultra-dry aggregates having a water content of zero in an absolutely dry state. The amount of water absorbed into the aggregate is measured by a water absorption test, the maximum value of the corrected water amount to be added to the mixing water is obtained, and a trial kneading of the ultra-light aggregate concrete containing the predetermined amount of the aggregate is performed. Determine a suitable value of the amount of correction water to be added, and then in a later manufacturing step, impregnate a part of the mixing water in advance in the absolutely dry blended aggregate to obtain a stable low water content, and then mix. It is an object of the present invention to provide a method for producing an ultra-light aggregate concrete capable of maintaining the super-light weight and stable quality while maintaining the remaining weight of the water and the compounding material. That is, the means for solving the problems of the present invention are as follows. (1) Using an ultra-light aggregate in a completely dry state, the amount of water absorbed by the aggregate is measured by a water absorption test in the test stage of the previous process, and the corrected amount of water added to the mixing water by the absorption of water into the aggregate. Calculate the maximum value of, and within the maximum value, gradually increase the amount of the mixing water input by a fixed amount over time, perform trial kneading of the ultra-light aggregate concrete mixed with the aggregate in a predetermined amount, The quality of the mixed fresh concrete is measured over time, and repeated until it is confirmed that the mixed concrete has reached a stable state, a suitable value of the correction water amount to be added to the mixing water of the ultralight aggregate concrete is determined, and the A suitable amount of mixing water is determined from the preferable value, and then, at a later stage of the manufacturing stage, the blended aggregate is immersed in a part of a suitable amount of mixing water to be impregnated in advance, and a predetermined time is applied. After the passage, with the rest of the mixing water,
A method for producing ultra-light aggregate concrete, characterized in that all of the compounding materials are charged and fully kneaded so that both ultra-lightness and stable quality can be maintained. (2) Using an ultra-light aggregate in a completely dry state, first measure the amount of water absorbed by the aggregate in a test step in the previous process by a water absorption test, and add the corrected water amount added to the mixing water by absorbing water into the aggregate. Determine the maximum value, within the maximum value, the amount of the mixing water is gradually increased by a small amount over time, to perform a trial kneading of the ultra-light aggregate concrete containing a predetermined amount of the aggregate, The quality of the mixed fresh concrete is measured over time, and repeated until it is confirmed that a stable state has been attained, a suitable value of the correction water amount to be added to the mixing water of the ultralight aggregate concrete is determined, and From the suitable value, determine a suitable amount of mixing water, and then, at a later stage of the manufacturing stage, put the blended aggregate into a mixer, add a suitable amount of mixing water, and add a portion thereof. Stir to impregnate, and after a predetermined time elapse, mix water remaining. If, to this kneaded by introducing all compounding materials, super lightweight and stable method for producing ultra-lightweight aggregate concrete, characterized in that as the can hold together quality. (3) In the manufacturing stage of the post-process, a part of the suitable amount of mixing water determined in the pre-process is impregnated in advance for a predetermined period of time into the absolutely lightweight aggregate in the dry state to be blended for a predetermined period of time to obtain a stable low- The method according to item (1) or (2), wherein, after being in a water-containing state, the remainder of the mixing water and the compounding material are all charged and fully kneaded to produce an ultra-light aggregate concrete. A method for producing the ultralight aggregate concrete according to the above.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for producing ultra-light aggregate concrete according to the present invention will be described in detail with reference to FIG. By the way, the method for producing the ultra-light aggregate concrete of the present invention is roughly classified into the following methods.The amount of water absorbed by the ultra-light aggregate in a completely dry state is measured by a water absorption test, and the maximum value of the corrected water amount to be added to the mixing water is measured. Is determined, a trial kneading of the ultra-lightweight aggregate concrete in which the aggregate is blended in a predetermined amount is performed, a suitable value of the correction water amount to be added to the mixing water is determined, and then a suitable input amount of the mixing water is determined. In the test stage of the previous process, the absolutely dry blended aggregate of ~ is immersed in a suitable amount of mixing water or put into a mixer, and a part of the mixing water is added. Stir or impregnate in advance, and after a predetermined period of time, make it into a stable and low water content state, then put in the rest of each mixing water and all the compounding materials and fully knead them, and mix the ultralight aggregate concrete. It is composed of the manufacturing stage of the post-process, Combined with the process organically, and characterized in that as can be held together its super-lightweight and stable quality.

[0005] First, the present invention uses, as an ultra-light aggregate, an absolutely dry ultra-light aggregate having a water content of zero which is optimal from the viewpoint of quality control. In the present invention, in order to measure the maximum value of the water absorption of the ultra-light aggregate in the next step, it is desirable to store the ultra-light aggregate in a storage tank in a completely dry state until immediately before use. Next, the water absorption amount (maximum value) of the above-mentioned ultra-light aggregate in a completely dry state is measured by a water absorption test, and the maximum value of the corrected water amount added to the mixing water is determined by the water absorption in the aggregate. Although the measurement of water absorption is based on JIS A1134 “Testing method for specific gravity and water absorption of lightweight lightweight aggregate for structure”, since the specific gravity of ultra-light aggregate is smaller than 1.0 and floats on water, it is similar to JISA1134. It is not easy to measure specific gravity and water absorption by a pycnometer. Rather, it is desirable to apply measurement of underwater weight using a wire mesh basket as in JIS A1135 “Testing method for specific gravity and water absorption of lightweight coarse aggregate”.

[0006] Next, within the maximum value of the corrected water amount, while increasing the input amount of the mixing water over time by a constant small amount, an ultra-light aggregate in which a predetermined amount of the above-mentioned ultra-light aggregate in the dry state is blended. Trial the concrete, measure the quality of the mixed fresh concrete over time, confirm that it has reached a stable state, and adjust the amount of correction water that has been injected until it confirms that it has reached a stable state. It is determined to be a suitable value to obtain, and the input amount of the mixing water is determined accordingly. In addition,
The quality measurement of fresh concrete at least
It is desirable to check whether the ultralight aggregate is evenly mixed without being damaged, and to measure slump according to JIS A1101 “Concrete slump test method”. As a result of the time-dependent quality measurement, if the quality varies greatly and lacks stability, the amount of water to be supplied is repeatedly increased until the stability is confirmed, and the mixture is kneaded.

[0007] determined by the above pre-process of
Based on the suitable amount of mixing water for the ultra-light aggregate, the following manufacturing processes of the following steps are performed. First, the ultra-lightweight aggregate in an absolutely dry state, which is blended according to the quality of the concrete, is immersed in a part of mixing water of a suitable input amount and impregnated in advance, or the above-mentioned blended aggregate is The mixture is put into a mixer, a suitable amount of mixing water is added, and the mixture is previously stirred and impregnated to obtain a stable low water content state. In the process, if air bubbles remain between the aggregate particles and the amount of air in the mixed concrete increases, the air bubbles may be escaped by sufficiently stirring, or the air bubbles may be removed by mixing an antifoaming agent or the like. It is necessary to take measures to eliminate it. Next, after the elapse of a predetermined time, after the stable low water content state, the remaining of the respective mixing water and the entire mixing material are charged and fully kneaded, and the quality can be stably maintained without impairing the ultralight weight. Thus, an ultra-light aggregate concrete is manufactured.

[Method of Measuring Specific Gravity and Water Absorption of Ultralight Aggregate] Next, a method of measuring the specific gravity and water absorption of the ultralight aggregate according to the production of the ultralight aggregate concrete of the present invention will be described. In recent years, ultra-light aggregates having a bone-dry specific gravity of less than 1.0 have been developed for the purpose of reducing the weight of structures. In quality control of ultralight concrete using such ultralight aggregate, it is basically necessary to measure the specific gravity and water absorption of the ultralight aggregate quickly and accurately. However, in the case of such an ultra-lightweight aggregate, the particle size is approximately 0.
About 3mm fine and specific gravity less than 1.0,
Due to the characteristics of floating in water, it is almost impossible to measure the specific gravity and the water absorption with a pycnometer as in the conventional JIS A1134 “Test method for specific gravity and water absorption of lightweight lightweight aggregate for structure”. In the present invention, the specific gravity and water absorption of the ultra-lightweight aggregate having the absolute dry specific gravity of less than 1.0 and floating on water are focused on the particle size of the fine aggregate, and JISA1135 “Specific gravity and water absorption of the lightweight coarse aggregate are used. The present invention provides a method for measuring the specific gravity and the water absorption of ultra-light aggregates, which can be easily measured by applying the "test method for water absorption". In the present invention, attention is paid to the fact that the particle size of the ultra-lightweight aggregate is about 0.3 mm and does not include fine particles of 0.15 mm or less at all, and the fine particles of 0.075 mm or less do not pass through the fine particles of the aggregate at all. It is possible to measure the underwater mass Ww by enclosing it in a wire mesh basket of a mesh size, and take out the sample measured in water and wrap it in a cloth such as a rag that does not allow fine particles of 0.15 mm or more of the aggregate to pass at all. , A surface dry sample is easily prepared by wiping the water on the surface, and the surface dry mass Ws
And finally dry in a furnace to measure the absolute dry mass Wd. JISA1135 "Calculate the specific gravity and water absorption of the lightweight coarse aggregate, apply the surface dry specific gravity Ds The dry specific gravity Dd and the water absorption Q (%) are calculated.

That is, the solution of the present invention is as follows. (1) The method for measuring the specific gravity and water absorption of an ultra-lightweight aggregate having a particle size of about 0.3 mm, containing no fine particles of 0.15 mm or less, and having an absolutely dry specific gravity of less than 1.0 The mass of the ultra-light aggregate in the state is measured in the air to prepare a sample for underwater measurement, the sample is sealed in a wire mesh basket of a fine mesh size that does not pass through the fine particles of the ultra-light aggregate, and immersed in water. The underwater mass Ww is measured, then the sample measured in the water is taken out, the water adhering to the surface is wiped off with a cloth such as a rag, a surface dry sample is prepared, and the surface dry mass Ws is measured. The sample was dried in an oven, an absolutely dry sample was prepared and the absolute dry mass Wd was measured, and the underwater mass Ws, the surface dry mass Ws, and the absolute dry mass Wd were measured.
From the measured value of d, the surface dry specific gravity Ds, the absolute dry specific gravity Dd, and the water absorption Q (%) are calculated as follows: Ds = Ws / (Ws−Ww), Dd = 100 Ws / (100 + Q) (Ws−Ww), Q = 100 A method for measuring the specific gravity and the water absorption of an ultra-light aggregate, wherein the specific gravity and the water absorption are calculated by a calculation formula of (Ws−Wd) / Wd. (2) The wire mesh basket for underwater weight measurement is 0.075 m
m. The method for measuring the specific gravity and the water absorption of an ultra-light aggregate according to the above item (1), wherein the method is formed of a wire mesh having a mesh size of not more than m. (3) 0.15 mm ultra-light aggregate measured in water
The ultra-light aggregate according to the above (1), wherein a surface-dried sample can be easily prepared by wrapping it in a cloth such as a rag that does not allow the fine particles to pass at all, and wiping the water on the surface. Method for measuring specific gravity and water absorption.

FIG. 1 is a block diagram showing an embodiment of a method for measuring the specific gravity and water absorption of an ultralight aggregate whose specific gravity is smaller than 1.0 and which is light enough to float on water according to the present invention. Based on FIG. 2, a detailed description will be given in the order of steps (1) to (4). First, an ultralight aggregate that is light enough to float in the water is sampled in an air-dried state, and the mass is measured in the air to prepare a sample having a predetermined mass for underwater measurement. Next, the present invention focuses on the fact that the ultralight aggregate does not contain any fine particles of 0.15 mm or less, and as shown in the diagram of the method of measuring the mass underwater using the wire mesh basket 1 in FIG. Through the fine granules of the wood at all,
The underwater measurement sample 5 of the ultra-light aggregate is sealed in a wire mesh basket 1 formed of a wire mesh having a fine mesh size of 0.075 mm or less, suspended in water 7 via a suspending tool 4, and weighed. 6. The underwater mass Ww is measured according to 6. In addition, reference numeral 2 denotes a basket container formed of a detachable wire mesh, and reference numeral 3 denotes an upper lid connected to the suspender 4. Further, the fact that the ultralight aggregate does not contain fine particles of 0.15 mm or less means that the above-mentioned sample measured in water is wrapped in a cloth such as a rag, and even if the water attached to the surface is wiped, Since the cloth does not pass through fine grains of 0.15 mm or more, there is no possibility that the superlight aggregate flows out together with water, and the entire amount is left in the cloth such as a rag. The underwater sample is taken out of the wire mesh basket 1, wrapped in a cloth such as a rag, and the water adhering to the surface is wiped off to easily prepare a surface dry sample, and the surface dry mass Ws is measured. Next, the surface-dried sample is dried in a furnace to a constant mass to prepare a completely-dried sample, and the absolute-dry mass Wd is measured. Next, from the measured values of the underwater mass Ww, the surface dry mass Ws, and the absolute dry mass Wd, JISA1
The following calculation formulas for calculating the specific gravity and the water absorption of the lightweight coarse aggregate of 135 are applied mutatis mutandis to calculate the surface dry specific gravity Ds, the absolute dry specific gravity Dd, and the water absorption Q (%) of the ultralight aggregate. Ds = Ws / (Ws−Ww), Dd = 100 Ws / (100 + Q) (Ws−Ww), Q = 100 (Ws−Wd) / Wd,

According to the above-described measuring method, conventionally, ultra-lightweight aggregates have a fine particle size of about 0.3 mm and a specific gravity of 1.0 mm.
Because it is smaller and has the property of floating on water, it was almost impossible to measure the specific gravity and water absorption by a pycnometer as in the conventional test method of JIS A1134. Paying attention to the fact that the particle size is about 0.3 mm and does not include any fine particles of 0.15 mm or less, and applying the "test method for specific gravity and water absorption of coarse aggregate" of JIS A1135, Because the specific gravity and water absorption of ultra-lightweight fine aggregate can be easily measured in the process order,
It is possible to easily control the quality of the ultralight aggregate floating on the water and, consequently, the quality of the ultralight concrete.

[Method for Determining the Air Volume of Ultralight Aggregate Concrete] The quality control technique of the ultralight aggregate concrete obtained by the manufacturing method of the present invention, particularly, the method for determining the air volume of the concrete will be described below. Conventionally, the following three methods have been defined as methods for testing the amount of air in fresh concrete. (I) JISA1116 "Test method for unit volume weight of concrete and air volume test method (weight method)" (ii) JISA1118 "Test method for volume of air volume of concrete not yet solidified (volume method)" (iii) JISA1128 "still Test Method by Pressure of Air Volume of Unconsolidated Concrete (Air Chamber Pressure Method)] However, regarding the test method of air volume of ultra-light aggregate concrete using ultra-light aggregate, the specific gravity of ultra-light aggregate is 1.0. Since the small variation of the specific gravity of the aggregate is very small and less than the following, the slight change in the specific gravity of the aggregate significantly affects the unit weight of the ultra-light aggregate concrete. If data such as specific gravity and water content are not accurate, the test error will be large, and it is extremely difficult to determine the air volume from the weight method.

[0013] Further, since the ultra-light aggregate is porous, has a large amount of water absorption, and has a small strength, conversely, (iii)
In the case of the air chamber pressure method, when the measured pressure is applied, the aggregate absorbs water, and the accuracy is deteriorated. Therefore, it can be said that it is impossible to directly obtain the air amount from the pressure method. Then (i
The volume method of i) has a simple apparatus, has few failures, has relatively high measurement accuracy, and is used as a method for testing the amount of air in concrete using porous lightweight aggregate. In the case of concrete using ultra-light aggregates, the measurement error becomes large due to the effect of its water absorption characteristics, and it is not possible to obtain measurement values with few errors unless special consideration is given to the water absorption characteristics it is conceivable that. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for testing the amount of air in an ultralight aggregate concrete having a small error in consideration of the water absorption characteristics of the ultralight aggregate, based on a conventional test method based on volume.

In order to solve the above-mentioned problems, the method for testing the amount of air according to the present invention absorbs water for an extremely lightweight aggregate sample having a remarkably large amount of water in advance for a predetermined period of time to reduce the water content. Measure the air volume separately in the same condition as in the concrete sample, and take special measures such as reducing air volume measurement errors by removing bubbles remaining around the aggregate with an antifoaming agent. An object of the present invention is to provide a method for measuring the amount of air and measuring the air amount of fresh concrete of ultra-light aggregate concrete with a small error. That is, the test method of the present invention is as follows. (1) In a method for obtaining the air amount of fresh concrete of ultra-light aggregate concrete using ultra-light aggregate having a low water content or absolutely dry state, a predetermined amount of the ultra-light aggregate is measured and a sample for two tests is measured. Sample, absorb water in advance for a specified period of time to obtain a specified low water content, and then use one test sample to make an ultralight aggregate concrete sample of a specified mix ratio, pack it into a container, and use the test method based on volume. Therefore, air volume A
₁ (%), the other test sample is packed in a fixed container, the air volume is measured according to the test method based on volume, and the aggregate of the ultralight aggregate sample in the ultralight aggregate concrete sample is determined. correction coefficient a ₂ seeking _(%), and characterized in that as to calculate the a = a ₁ -A ultra lightweight aggregate concrete modified with aggregate correction coefficient by a _second calculation formula air amount a (%) How to find the air volume of ultra-light aggregate concrete. (2) In the test method using the volume, the air bubbles remaining around the ultralight aggregate are removed with an antifoaming agent so as to reduce the measurement error of the air amount, (1).
How to find the air volume of ultra-light aggregate concrete as described in section.

An embodiment of the method for obtaining the air amount of the ultra-light aggregate concrete according to the present invention will be described in detail in the order of the steps based on the block diagram (FIG. 4) showing the order of the steps of the test method. Since the present invention is a method for determining the amount of air when producing ultra-light aggregate concrete using ultra-light aggregate in a low water content or in a dry state, first, the ultra-light in the low water content or in a dry state Using the aggregate as a sample, a predetermined amount of the ultra-light aggregate is measured, and an ultra-light aggregate sample for two tests is prepared. The predetermined amount of the sample is determined from the capacity of the air volume measuring container. Next, the ultralight aggregate sample for the two tests is immersed in water for a predetermined time in advance to absorb water to a predetermined low water content. Simultaneously absorbing the water content of the two specimens of the ultra-light aggregate sample is performed by making the water-containing state of the ultra-light aggregate sample measured separately and the water-containing state of the ultra-light aggregate in the ultra-light aggregate concrete sample equal. Thus, the measurement error of the air amount is reduced. In addition, if the ultra-light aggregate is made to have a sufficient water absorption state, the ultra-light aggregate concrete to be produced is impaired in its ultra-lightweight property, which is not a good measure, and it can be said that it is preferable to use it in a low water-containing state. Even for the two test samples, water absorption during measurement is almost eliminated when water is sufficiently absorbed, and it is easy to measure the air amount with a small error. In addition, the immersion time for obtaining a predetermined low water content state is naturally set to be longer in the absolutely dry state than in the extremely low water content state.

According to the present invention, a special consideration is given to the water absorption characteristics of an ultra-light aggregate sample as described above,
In accordance with the test method based on the volume of A1118, the air amount was separately put into a certain container, and the aggregate correction coefficient A ₂
(%). The measurement and calculation of the air amount will be described in detail below. That is, an ultra-light aggregate concrete sample having a predetermined blending ratio is prepared by using one quantitative sample of the ultra-light aggregate samples for two tests. The method of sampling the fresh concrete is described in JIS A11.
It can be collected according to the rules of 15 or made according to the rules of JIS A1138. The air content of the ultra-light aggregate concrete sample is measured in accordance with the test method based on the volume of JIS A1118. That is, an ultra-light aggregate concrete sample is put in a container, the upper part is filled with water and the lid is covered, the container is rolled, the air in the concrete is expelled, and the volume of the air is measured by replacing with water. If air bubbles are expected to remain around the ultra-light aggregate in the concrete, the air bubbles are removed by mixing an antifoaming agent or the like to reduce the measurement error of the air amount. Next, the (measured) air amount A ₁ (%) of the ultralight aggregate concrete is obtained by the following equation (Equation 1).

[0017]

(Equation 1)

Next, the other quantitative sample of the ultra-light aggregate sample for the two tests is packed in a fixed container, and the upper part is filled with water and covered with a lid according to the test method based on JIS A1118, and the container is closed. Roll out the air in the aggregate sample and replace it with water to measure the volume of air. If air bubbles remain around the aggregate, the air bubbles are removed with an antifoaming agent or the like. Next, the aggregate correction factor A of the ultralight aggregate sample in the ultralight aggregate concrete sample was determined from the measured air volume.
Find ₂ (%). From the above, the result, calculates the air quantity A ultra lightweight aggregate concrete modified with aggregate corrected ultra lightweight aggregate factor A _{2 (%)} (%) of at following equation (Equation 2).

[0019]

(Equation 2)

The air amount A (%) calculated by the above (Equation 2) can be checked by measuring the cell structure of the hardened concrete, and the result of the method of the present invention was extremely good.

According to the above-described method for determining the air amount, since the ultra-light aggregate has a characteristic of remarkably large water absorption, the air amount of the ultra-light aggregate concrete is measured by the conventional test method. Although a large error occurred and the measurement was extremely difficult, according to the method of determining the air amount in the steps of the present invention, special consideration was added to the water absorption characteristics, and the air amount with a small error was added. This makes it easy to control the quality of the ultra-light aggregate concrete, and can contribute to the remarkable improvement of the workability of the ultra-light aggregate concrete while utilizing the characteristics of the ultra-light aggregate.

[0022]

As described above, according to the method for producing ultralight aggregate concrete of the present invention, an ultralight aggregate in a dry state is used. Determine the appropriate amount of mixing water to be added, and in the subsequent manufacturing stage, stabilize the premix by mixing a part of the mixing water with the appropriate amount of the absolutely dry ultralight aggregate to be blended in advance. After making it into a low water content state, the rest of the mixing water and the whole of the compounding materials were charged and fully kneaded, so that it was possible to produce an ultralight aggregate concrete that maintained both ultralight and stable quality, It is easy to control the quality of ultra-light aggregate concrete, and it is possible to improve the quality while making use of the characteristics of ultra-light weight concrete, and it is expected to make a great contribution to the development of lightweight curtain walls and the like, which are fields of application.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a process sequence of a method for manufacturing an ultralight aggregate concrete according to the present invention.

FIG. 2 is a block diagram showing a process sequence of a method for measuring specific gravity and water absorption of an ultralight aggregate according to the present invention.

FIG. 3 is an explanatory diagram of a method of measuring the mass in water using a wire mesh basket.

FIG. 4 is a block diagram showing a process sequence of a method for testing an air amount of ultra-light aggregate concrete according to the present invention.

[Explanation of symbols]

 1: Wire mesh basket 2: Basket container 3: Top cover 4: Hanging tool 5: Sample for underwater measurement 6: Scale 7: Underwater

Claims (3)

[Claims] 1. An ultra-light aggregate in a completely dry state is used. First, in the test stage of the previous process, the amount of water absorbed by the aggregate is measured by a water absorption test, and the water is absorbed by the aggregate and added to the mixing water. Find the maximum value of the corrected water amount, within the maximum value, gradually increase the input amount of the mixing water by a small amount over time, and perform trial kneading of ultra-light aggregate concrete with a predetermined amount of the aggregate. The quality of the mixed fresh concrete was measured over time, and repeated until it was confirmed that a stable state had been reached, the optimum value of the correction water amount to be added to the mixing water of the ultralight aggregate concrete was determined, In addition, a suitable amount of mixing water is determined from the preferable value, and then, at a later stage of the manufacturing process, the mixed aggregate is immersed in a part of a suitable amount of mixing water, impregnated in advance, and After the time has passed, remove the remaining mixing water and all ingredients Type to the kneading, ultra lightweight and stable method for producing ultra-lightweight aggregate concrete, characterized in that as the can hold together quality. 2. Using an ultra-lightweight aggregate in an absolutely dry state, first, in the test stage of the previous process, the amount of water absorbed by the aggregate is measured by a water absorption test, and the water is absorbed by the aggregate and added to the mixing water. Obtain the maximum value of the corrected water amount, within the maximum value, increase the amount of the mixing water by a fixed small amount over time, and perform trial kneading of ultra-light aggregate concrete in which the aggregate is mixed in a predetermined amount, The quality of the mixed fresh concrete is measured over time, and repeated until it is confirmed that a stable state has been reached, to determine a suitable value of the correction water amount to be added to the mixing water of the ultralight aggregate concrete, and Determine a suitable amount of mixing water from the preferable value, and then, in a later stage of the manufacturing stage, put the blended aggregate into a mixer, add a suitable amount of mixing water, and add Stir to impregnate, and after a predetermined time, mix water Litho, and the kneaded by introducing all compounding materials, super lightweight and stable method for producing ultra-lightweight aggregate concrete, characterized in that as the can hold together quality. 3. In the manufacturing step of the post-process, a part of the suitable amount of the mixing water determined in the previous process is impregnated in advance in the absolutely dry ultra-light aggregate to be blended for a predetermined time to stabilize. 3. The ultra-light weight according to claim 1 or 2, wherein the remaining water of the mixing water and the compounding material are all charged and fully kneaded after the mixture is made to have a low water content to produce an ultra-light aggregate concrete. Aggregate concrete manufacturing method.