JP3525802B2 - Method for measuring surface water ratio of fine aggregate and measuring method of concrete material using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of measuring the surface water ratio of fine aggregates for correcting the amount of water when measuring concrete materials, and a method of measuring concrete materials using the same.

[0002]

2. Description of the Related Art When concrete is mixed on site, the amount of water has a great influence on the strength of the concrete, so it is necessary to manage it well during mixing. The water content differs depending on the type. When wet aggregate is used, the amount of water in concrete increases by the amount of surface water of aggregate, and when dry aggregate is used, the amount of water in concrete decreases by effective water absorption.

Therefore, in order to maintain the quality of concrete, it is extremely important to correct the amount of water at the time of mixing according to the degree of dryness and wetness of the aggregate and manufacture concrete according to the specified mixture.

Here, the ratio of the amount of surface water in the wet state (the amount of water adhering to the surface of the fine aggregate) divided by the mass of the fine aggregate in the surface dry state (surface dry saturated state) is the surface water. It is called the rate, but since the stored aggregate, especially the fine aggregate is often wet, the surface water rate is measured in advance as an index of the dryness and humidity of the aggregate, and based on the measured value. It is common to adjust the amount of mixing water by mixing.

[0005] In order to measure the surface water ratio, a small amount of a sample is conventionally taken from a storage container called a stock bottle in which fine aggregate is stored, and its mass and its mass in an absolutely dry state are measured. Then, it was calculated using these measured values and the water absorption in the surface dry state measured in advance.

[0006]

However, in such a measuring method, since the total surface water content is estimated only from a small number of samples, there is a limit in terms of accuracy, but in the absolutely dry state. It is unrealistic in terms of economy and time to sample an amount close to the amount actually used, and to use it as a sample, because heating work using a drying furnace is required to measure the mass of Was causing the problem of being.

In order to compensate for such a problem, a method may be adopted in which the operator visually confirms the mixing condition or adjusts the mixing water amount by referring to the load current of the mixer. However, such a method itself has a low accuracy, and in the end, it is unavoidable to expect a large safety factor of about 20% in terms of strength, which causes a problem of uneconomical mixing.

The present invention has been made in consideration of the above-mentioned circumstances, and a method for measuring the surface water ratio of a fine aggregate capable of accurately measuring the surface water ratio of a fine aggregate and the measurement of a concrete material using the same. The purpose is to provide a method.

[0009]

In order to achieve the above object, the method for measuring the surface water ratio of fine aggregate according to the present invention is defined in claim 1.
As described above, the mass Msw of the fine aggregate in a wet state is measured, the fine aggregate is submerged in a predetermined container, and the total mass Mf and the total volume Vf of the fine aggregate and water in the container are calculated. From the total mass Mf and the total volume Vf to the volume V of the fine aggregate.
s, the mass Mw of the water, the mass Ms when the fine aggregate is in the dry state, ρs is the density of the fine aggregate in the dry state, and ρw is the density of water

Vs = (Mf−Vf · ρw) / (ρs−ρw)

Mw = (Vf-Vs) ρw

Ms = Mf-Mw

Then, the mass M of the fine aggregate is calculated from
Surface water ratio (Msw-Ms) / Ms from sw and calculated Ms
Is calculated.

Further, in the method for measuring a concrete material according to the present invention, as described in claim 2, the mass Msw of the fine aggregate in a wet state is measured, and the fine aggregate is submerged in a predetermined container, The total mass Mf and the total volume Vf of the fine aggregate and water in the container are measured, and from the total mass Mf and the total volume Vf, the volume Vs of the fine aggregate, the mass Mw of the water, the fine aggregate Where Ms is in the surface dry state, ρs is the density of fine aggregate in the surface dry state, and ρw is the density of water

Vs = (Mf−Vf · ρw) / (ρs−ρw)

Mw = (Vf-Vs) ρw

Ms = Mf-Mw

From the mass Msw of the fine aggregate and the calculated Ms, the surface water ratio (Msw-Ms) / Ms is calculated, and then the fine aggregate and water in the container are used as the concrete material. At the same time, a shortage of fine aggregate is collected from a storage container in which the fine aggregate is stored and replenished, and the surface water ratio is applied to the collected fine aggregate to correct the amount of water.

Further, according to the third aspect of the present invention, there is provided a method for measuring a surface water ratio of fine aggregates, wherein the mass Msw of fine aggregates in a wet state is measured, and the fine aggregates are placed in a predetermined container. Submerged in water, total mass Mf and total volume Vf of fine aggregate and water in the container
Is measured, and from the total mass Mf and the total volume Vf, the volume Vs of the fine aggregate, the mass Mw of the water, the mass Ms when the fine aggregate is in the dry state, and ρs are the dry state. The density of fine aggregate, ρw is the density of water, and a is the amount of air (%) contained in the total volume Vf.

Vs = (Mf-Vf (1-a / 100) .ρ
w) / (ρs-ρw)

Mw = (Vf (1−a / 100) −Vs) ρw

Ms = Mf-Mw

Then, the mass M of the fine aggregate is calculated from
Surface water ratio (Msw-Ms) / Ms from sw and calculated Ms
Is calculated.

Further, in the method for measuring a concrete material according to the present invention, as described in claim 4, the mass Msw of the fine aggregate in a wet state is measured, and the fine aggregate is submerged in a predetermined container, The total mass Mf and the total volume Vf of the fine aggregate and water in the container are measured, and from the total mass Mf and the total volume Vf, the volume Vs of the fine aggregate, the mass Mw of the water, the fine aggregate Is the mass Ms in the surface dry state, ρs is the density of the fine aggregate in the surface dry state, ρw is the density of water, and a is the amount of air (%) contained in the total volume Vf.

Vs = (Mf-Vf (1-a / 100) .ρ
w) / (ρs-ρw)

Mw = (Vf (1−a / 100) −Vs) ρw

Ms = Mf-Mw

From the mass Msw of the fine aggregate and the calculated Ms, the surface water ratio (Msw-Ms) / Ms is calculated, and then the fine aggregate and water in the container are used as the concrete material. At the same time, a shortage of fine aggregate is collected from a storage container in which the fine aggregate is stored and replenished, and the surface water ratio is applied to the collected fine aggregate to correct the amount of water.

In the method of measuring the surface water ratio of a fine aggregate and the method of measuring a concrete material using the same according to claims 1 and 2, first, the mass Msw of the fine aggregate in a wet state is measured.

Next, the fine aggregate is submerged in a predetermined container,
In this state, the total mass Mf and the total volume Vf of the fine aggregate and water in the container are measured. When measuring, make sure that the air is exhausted from the container.

Next, from the total mass Mf and the total volume Vf, the volume Vs of fine aggregate, the mass Mw of water, the mass Ms when the fine aggregate is in the surface dry state, and ρs are the fine aggregate in the surface dry state. Density, ρw is the water density

Vs = (Mf-Vfρw) / (ρs-ρw)

Mw = (Vf-Vs) ρw

Ms = Mf-Mw

It is calculated from

Of the above calculation formulas, the first formula is (Mf-
As can be seen by transforming Vf · ρw) = Vs (ρs−ρw), the total mass Mf minus the mass Vf · ρw assuming that the fine aggregate is replaced by water (Mf Vf
・ Ρw) is based on the idea that it is equal to the amount obtained by subtracting the mass Vs · ρw of water corresponding to the volume of fine aggregate from the surface dry mass Vs · ρs of fine aggregate.

Next, the mass Msw of the fine aggregate and the calculated M
Surface water ratio (Msw-Ms) / Ms is calculated from s.

In this way, it is possible to measure the surface water content of the fine aggregate for the amount used for concrete mixing, for example, one batch or an amount close to that, rather than the conventional small amount. Therefore, the surface water rate of the fine aggregate can be accurately calculated.

Although the container for submerging the fine aggregate is optional,
If the container used for measuring the concrete material is used, it is possible to measure the mixing unit of concrete, that is, the amount corresponding to one batch, at one time.

Since the fine aggregates and water in the container have already been measured in the process of measuring the surface water ratio, these fine aggregates and water are used as they are for the concrete material without remeasurement. Can be used as And
At this time, if the amount of water is corrected by using the mass Mw of water described above, it is possible to perform on-site formulation as indicated or similar.

The amount of fine aggregate and water in the container is preferably one batch or an amount close to one batch for accuracy, and it is possible. However, for example, only half the amount of one batch is charged. However, as compared with the conventional surface water ratio measuring method, a much larger amount of fine aggregate is targeted, and sufficient accuracy can be improved.

The amount of fine aggregate and water in the container is basically arbitrary as described above, and a unit for mixing concrete,
For example, it is not necessary to fit into one batch. Therefore, it may be considered that the fine aggregate and water used for measuring the surface water ratio are insufficient to mix, for example, one batch of concrete, but in such a case, the insufficient fine aggregate and water can be used. May be replenished appropriately.

Here, in order to supplement the shortage of fine aggregate,
The fine aggregate and water in the container described above is used as a concrete material, and the insufficient aggregate is collected and replenished from the storage container in which the fine aggregate is stored, and the fine aggregate is collected with respect to the sample. The surface water rate is applied to correct the water volume.

In this way, the water amount can be corrected without re-measurement of the surface water ratio of the newly collected fine aggregate. If this is fine aggregate stored in the same storage container as the fine aggregate used as the basis for calculating the surface water rate, the surface water rate is equivalent to the surface water rate previously calculated. This is based on the idea that the quality of concrete does not matter even if it is regarded as.

Next, in the method for measuring the surface water ratio of fine aggregates according to claims 3 and 4 and the method for measuring concrete material using the same, first, the mass M of the fine aggregate in a wet state is measured.
Weigh sw.

Next, the fine aggregate is submerged in a predetermined container,
In this state, the total mass Mf and the total volume Vf of the fine aggregate and water in the container are measured. When measuring, make sure that most of the air is discharged from the container.

Next, from the total mass Mf and the total volume Vf, the volume Vs of the fine aggregate, the mass Mw of water, the mass Ms when the fine aggregate is in the dry state, and ρs are the fine aggregate in the dry state. Where ρw is the density of water and a is the amount of air (%) contained in the total volume Vf.

Vs = (Mf-Vf (1-a / 100) .ρ
w) / (ρs-ρw)

Mw = (Vf (1−a / 100) −Vs) ρw

Ms = Mf-Mw

It is calculated from

Of the above calculation formulas, the first formula is (Mf-
As can be seen clearly by transforming Vf (1−a / 100) · ρw) = Vs (ρs−ρw), the mass Vf (1 when the fine aggregate is assumed to be replaced with water from the total mass Mf -A /
100) · ρw subtracted amount (Mf-Vf (1-a / 1
00) .rho.w) is based on the idea that it is equal to the amount obtained by subtracting the mass Vs.rho.w of water equivalent to the volume of the fine aggregate from the surface dry mass Vs.rho.s of the fine aggregate.

Next, the mass Msw of the fine aggregate and the calculated M
Surface water ratio (Msw-Ms) / Ms is calculated from s.

In this way, the surface water content of the fine aggregate can be measured not for a small amount as in the past but for an amount used for concrete mixing, for example, one batch or an amount close thereto. Therefore, the surface water rate of the fine aggregate can be accurately calculated.

The container for submerging the fine aggregate is optional,
If the container used for measuring the concrete material is used, it is possible to measure the mixing unit of concrete, that is, the amount corresponding to one batch, at one time.

Since the fine aggregates and water in the container have already been measured in the process of measuring the surface water ratio, these fine aggregates and water are used as they are for the concrete material without remeasurement. Can be used as And
At this time, if the amount of water is corrected by using the mass Mw of water described above, it is possible to perform on-site formulation as indicated or similar.

The amount of fine aggregate and water in the container is preferably one batch or an amount close to it as a guide for accuracy and it is possible, but for example, only half the amount of one batch is charged. However, as compared with the conventional surface water ratio measuring method, a much larger amount of fine aggregate is targeted, and sufficient accuracy can be improved.

The amount of fine aggregate and water in the container is basically arbitrary as described above.
For example, it is not necessary to fit into one batch. Therefore, it may be considered that the fine aggregate and water used for measuring the surface water ratio are insufficient to mix, for example, one batch of concrete, but in such a case, the insufficient fine aggregate and water can be used. May be replenished appropriately.

Here, in order to supplement the shortage of fine aggregate,
The fine aggregate and water in the container described above is used as a concrete material, and the insufficient aggregate is collected and replenished from the storage container in which the fine aggregate is stored, and the fine aggregate is collected with respect to the sample. The surface water rate is applied to correct the water volume.

By doing so, the water amount can be corrected without re-measurement of the surface water ratio of the newly collected fine aggregate. If this is fine aggregate stored in the same storage container as the fine aggregate used as the basis for calculating the surface water rate, the surface water rate is equivalent to the surface water rate previously calculated. This is based on the idea that the quality of concrete does not matter even if it is regarded as.

[0061]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the method for measuring the surface water ratio of fine aggregates and the method for measuring concrete materials using the same according to the present invention will be described below with reference to the accompanying drawings. It should be noted that parts and the like which are substantially the same as those of the conventional technique are designated by the same reference numerals and the description thereof is omitted.

(First Embodiment)

FIG. 1 is a flow chart showing the procedure of the method for measuring the surface water ratio of fine aggregate according to this embodiment. As can be seen from the figure, in the method for measuring the surface water ratio of the fine aggregate according to the present embodiment, first, the mass Msw of the fine aggregate in the wet state is given.
Is measured (step 101). Here, as the amount of fine aggregate, the amount required for one batch of concrete mixing is a standard. For example, it is desirable to add all the amount required for one batch of concrete mix.

Next, the fine aggregate is submerged in a predetermined container (step 102), and in this state, the total mass Mf and the total volume Vf of the fine aggregate and water in the container are measured (step 1).
03). It should be noted that the total volume V in the state that air bubbles are contained in the container
Be careful not to let air in as much as possible when pouring water so that f is not measured, and shake the container to expel bubbles if necessary.

Here, as a container for submerging the fine aggregate,
If the container used for measuring the concrete material is used, it is possible to measure the mixing unit of concrete, that is, the amount corresponding to one batch, at one time.

Next, from the measured mass Msw of fine aggregate, total mass Mf and total volume Vf, volume Vs of fine aggregate and mass M of water.
w and mass Ms of fine aggregate (surface dry state), ρs is the density of fine aggregate in the surface dry state, and ρw is the density of water

Vs = (Mf−Vf · ρw) / (ρs−ρw)

Mw = (Vf-Vs) ρw

Ms = Mf-Mw

It is calculated from (step 104).

Next, the mass Msw of the fine aggregate and the calculated M
The surface water ratio (Msw-Ms) / Ms is calculated from s (step 105).

As described above, according to the method of measuring the surface water ratio of fine aggregate according to the present embodiment, the amount used for concrete mixing, for example, 1 Since the surface water ratio of the fine aggregate can be measured for a batch or an amount close to it, it is possible to accurately calculate the surface water ratio of the fine aggregate.

Therefore, when such fine aggregate is used as a concrete material, it is possible to accurately correct the water amount of the surface water of the fine aggregate, and it is possible to improve the quality of concrete.

Further, at this time, since the fine aggregate and water in the container have already been weighed in the process of measuring the surface water ratio, there is no need to weigh them again. Then, if the amount of water is corrected by using the mass Mw of water described above at that time, it becomes possible to manufacture concrete with the on-site composition as indicated or close to it.

In the present embodiment, the amount of fine aggregate to be measured is set to the amount required for one batch so that the measurement accuracy of the surface water ratio becomes high. However, it is not always necessary to measure such amount. Instead, for example, the amount of surface water may be measured for half the amount of one batch. Even in such a case, a much larger amount of fine aggregate is targeted as compared with the conventional surface water percentage measuring method, and the surface moisture percentage of the fine aggregate can be measured with sufficient accuracy.

Further, in the present embodiment, although detailed description was not made in submerging the fine aggregate in the container, water may be added to the container used for measuring the mass of the fine aggregate, The fine aggregate that has been weighed may be placed in a container containing water.

(Second Embodiment)

FIG. 2 is a flow chart showing the procedure of the concrete material measuring method according to the present embodiment. As can be seen from the figure, the method for measuring the concrete material according to the present embodiment assumes the case where the fine aggregate or water whose surface water rate is calculated by the procedure described in the first embodiment is used as it is for the concrete material. Since the procedure (steps 101 to 105) until the surface water ratio is calculated is the same as that in the first embodiment, the description thereof is omitted here.

When the surface water ratio is calculated for the fine aggregate, the fine aggregate and water in the container are used as the concrete material. The fine aggregate and water in the container are as described above. Since the measurement has already been completed in the process of measuring the surface water ratio, it is not necessary to perform the measurement again.

When the fine aggregate or water in the container is used as a concrete material, it may be considered that the fine aggregate or water alone is insufficient for mixing one batch of concrete, for example.

First, when water is insufficient, the amount of water is corrected using the mass Mw of water calculated in the first embodiment.
That is, from the blending amount shown in the formula blending, the mass of water Mw
Water is newly replenished by the amount obtained by subtracting (step 106).

On the other hand, when the fine aggregate is insufficient, the fine aggregate is collected and supplemented from the storage container in which the fine aggregate used for the measurement of the surface water ratio is stored. The above-mentioned surface water ratio is applied to the fine aggregate to correct the water amount (step 107).

By doing so, the water amount can be corrected without re-measurement of the surface water ratio of the newly collected fine aggregate.

Next, concrete is produced by using the fine aggregate and water in the container and their supplements as a concrete material (step 108). Needless to say, when manufacturing concrete, it is necessary to measure cement, coarse aggregate, admixture, and other concrete materials so that the concrete composition is as specified.

As described above, according to the concrete material measuring method of the present embodiment, the fine aggregate and water in the container have already been measured in the process of measuring the surface water ratio. The fine aggregate and water can be directly used as the concrete material without re-measurement. Then, if the amount of water is corrected by using the mass Mw of water obtained in the process of calculating the surface water ratio, it is possible to achieve the formulation as indicated.

Further, according to the method for measuring a concrete material according to the present embodiment, when the amount of fine aggregate is insufficient, the amount of fine aggregate which is insufficient is removed from the storage container in which the fine aggregate whose surface water ratio has been measured is stored. Since it was collected and replenished, the surface water rate was applied to the collected fine aggregate to correct the water amount,
The water amount can be corrected without re-measurement of the surface water ratio of the newly collected fine aggregate.

(Third Embodiment)

FIG. 3 is a flow chart showing the procedure of the method for measuring the surface water ratio of fine aggregate according to this embodiment. As can be seen from the figure, in the method for measuring the surface water ratio of the fine aggregate according to the present embodiment, first, the mass Msw of the fine aggregate in the wet state is given.
Is measured (step 111). Here, as the amount of fine aggregate, the amount required for one batch of concrete mixing is a standard. For example, it is desirable to add all the amount required for one batch of concrete mix.

Next, the fine aggregate is submerged in a predetermined container (step 112), and in this state, the total mass Mf and the total volume Vf of the fine aggregate and water in the container are measured (step 1).
13). In addition, in order to avoid measuring the total volume Vf in a state where a large amount of bubbles are contained in the container, be careful not to let air enter as much as possible when water is introduced, and vibrate the container as necessary to eliminate bubbles. Drive out.

Here, as a container for submerging the fine aggregate,
If the container used for measuring the concrete material is used, it is possible to measure the mixing unit of concrete, that is, the amount corresponding to one batch, at one time.

Next, from the measured mass Msw of fine aggregate, total mass Mf and total volume Vf, volume Vs of fine aggregate and mass M of water.
w and mass Ms of fine aggregate (surface dry state), ρs is the density of fine aggregate in the surface dry state, ρw is the density of water, and a is the amount of air (%) contained in the total volume Vf.

Vs = (Mf-Vf (1-a / 100) .ρ
w) / (ρs-ρw)

Mw = (Vf (1−a / 100) −Vs) ρw

Ms = Mf-Mw

It is calculated from (step 114).

Next, the mass Msw of the fine aggregate and the calculated M
The surface water ratio (Msw-Ms) / Ms is calculated from s (step 115).

As described above, according to the method for measuring the surface water ratio of fine aggregate according to the present embodiment, the amount used for concrete mixing, for example, 1 Since the surface water ratio of the fine aggregate can be measured for a batch or an amount close to it, it is possible to accurately calculate the surface water ratio of the fine aggregate.

Therefore, if such fine aggregate is used as a concrete material, it becomes possible to accurately correct the amount of water relating to the surface water of the fine aggregate, the quality of the concrete can be improved, and the strength of the concrete can be improved. In view of this, it is not necessary to expect a large safety factor of nearly 20%, and as a result, it becomes possible to save the amount of cement and the amount of admixture.

Further, at that time, since the fine aggregate and water in the container have already been measured in the process of measuring the surface water ratio, there is no need to measure again. Then, if the amount of water is corrected by using the mass Mw of water described above at that time, it becomes possible to manufacture concrete with the on-site composition as indicated or close to it.

In the present embodiment, the amount of fine aggregate to be measured is set to the amount required for one batch so that the measurement accuracy of the surface water ratio becomes high. However, it is not always necessary to measure such amount. Instead, for example, the amount of surface water may be measured for half the amount of one batch. Even in such a case, a much larger amount of fine aggregate is targeted as compared with the conventional surface water percentage measuring method, and the surface moisture percentage of the fine aggregate can be measured with sufficient accuracy.

Further, in the present embodiment, although detailed description was not made in submerging the fine aggregate in the container, water may be added to the container used for measuring the mass of the fine aggregate, The fine aggregate that has been weighed may be placed in a container containing water.

(Fourth Embodiment)

FIG. 4 is a flow chart showing the procedure of the concrete material measuring method according to the present embodiment. As can be seen in the figure, the concrete material measuring method according to the present embodiment is assumed to use the fine aggregate or water whose surface water ratio is calculated by the procedure described in the third embodiment as it is as the concrete material. Since the procedure (steps 111 to 115) until the surface water rate is calculated is the same as that in the third embodiment, the description thereof is omitted here.

If the surface water ratio is calculated for the fine aggregate, the fine aggregate and water in the container are used as the concrete material. The fine aggregate and water in the container are as described above. Since the measurement has already been completed in the process of measuring the surface water ratio, it is not necessary to perform the measurement again.

When the fine aggregate or water in the container is used as a concrete material, it may be considered that the fine aggregate or water alone is insufficient to mix, for example, one batch of concrete.

First, when water is insufficient, the amount of water is corrected using the mass Mw of water calculated in the third embodiment.
That is, from the blending amount shown in the formula blending, the mass of water Mw
Water is newly replenished by the amount obtained by subtracting (step 116).

On the other hand, when the fine aggregate is insufficient, the short aggregate is collected from the storage container in which the fine aggregate used for measuring the surface water ratio is stored, and the fine aggregate is collected and collected. The above surface water ratio is applied to the fine aggregate to correct the water amount (step 117).

By doing so, the water amount can be corrected without re-measurement of the surface water ratio of the newly collected fine aggregate.

Next, concrete is produced using the fine aggregate and water in the container and their supplements as a concrete material (step 118). Needless to say, when manufacturing concrete, it is necessary to measure cement, coarse aggregate, admixture, and other concrete materials so that the concrete composition is as specified.

As described above, according to the concrete material measuring method of the present embodiment, the fine aggregate and water in the container have already been measured in the process of measuring the surface water ratio. The fine aggregate and water can be directly used as the concrete material without re-measurement. Then, if the amount of water is corrected by using the mass Mw of water obtained in the process of calculating the surface water ratio, it is possible to achieve the formulation as indicated.

Further, according to the method for measuring a concrete material according to the present embodiment, when the fine aggregate is insufficient, the fine aggregate which is lacking in the storage container in which the fine aggregate whose surface water ratio is measured is stored is removed. Since it was collected and replenished, the surface water rate was applied to the collected fine aggregate to correct the water amount,
The water amount can be corrected without re-measurement of the surface water ratio of the newly collected fine aggregate.

[0112]

As described above, according to the method for measuring the surface water ratio of the fine aggregate of the present invention according to claims 1 and 3,
It is possible to accurately calculate the surface water ratio of the fine aggregate.
Therefore, if such fine aggregate is used as a concrete material, it becomes possible to accurately correct the amount of water relating to the surface water of the fine aggregate, and it is possible to improve the quality of concrete.

Further, according to the concrete material measuring method of the present invention according to claim 2 and claim 4, the measurement of fine aggregate and water in the container has already been completed in the process of measuring the surface water ratio. Therefore, these fine aggregates and water can be used as they are as concrete materials without remeasurement. Then, if the amount of water is corrected by using the mass Mw of water obtained in the process of calculating the surface water ratio, it is possible to achieve the formulation as indicated. Further, when the amount of fine aggregate is insufficient, the water amount can be corrected without re-measurement of the surface water ratio of the newly collected fine aggregate.

[0114]

[Brief description of drawings]

FIG. 1 is a flowchart showing a procedure of a method of measuring surface water ratio of fine aggregate according to the first embodiment.

FIG. 2 is a flowchart showing a procedure of a concrete material measuring method according to a second embodiment.

FIG. 3 is a flowchart showing a procedure of a method for measuring a surface water ratio of fine aggregate according to a third embodiment.

FIG. 4 is a flowchart showing a procedure of a concrete material measuring method according to a fourth embodiment.

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP 59-77339 (JP, A) JP 60-66163 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B28C 7/00 G01N 33/38

Claims (4)

(57) [Claims] 1. The mass Msw of fine aggregate in a wet state is measured,
The fine aggregate is submerged in a predetermined container, the total mass Mf and the total volume Vf of the fine aggregate and water in the container are measured, and the total mass Mf and the total volume Vf of the fine aggregate are calculated. Volume Vs,
The mass Mw of the water, the mass Ms when the fine aggregate is in the dry state, ρs is the density of the fine aggregate in the dry state, and ρw is the density of water Vs = (Mf−Vf · ρw) / (Ρs-ρw) Mw = (Vf-Vs) ρw Ms = Mf-Mw, and then the surface water ratio (Msw-Ms) / Ms is calculated from the mass Msw of the fine aggregate and the calculated Ms. A method for measuring the surface water ratio of a fine aggregate, which is characterized in that 2. The mass Msw of the fine aggregate in a wet state is measured,
The fine aggregate is submerged in a predetermined container, the total mass Mf and the total volume Vf of the fine aggregate and water in the container are measured, and the total mass Mf and the total volume Vf of the fine aggregate are calculated. Volume Vs,
The mass Mw of the water, the mass Ms when the fine aggregate is in the dry state, ρs is the density of the fine aggregate in the dry state, and ρw is the density of water Vs = (Mf−Vf · ρw) / (Ρs-ρw) Mw = (Vf-Vs) ρw Ms = Mf-Mw, and the mass Msw of the fine aggregate and the calculated Ms
The surface water ratio (Msw-Ms) / Ms is calculated from the above, and then the fine aggregate and water in the container are used as a concrete material, and the fine aggregate lacking from the storage container storing the fine aggregate is calculated. A method for measuring a concrete material, comprising collecting and replenishing, and applying the surface water ratio to the collected fine aggregate to correct the amount of water. 3. The mass Msw of the fine aggregate in a wet state is measured,
The fine aggregate is submerged in a predetermined container, the total mass Mf and the total volume Vf of the fine aggregate and water in the container are measured, and the total mass Mf and the total volume Vf of the fine aggregate are calculated. Volume Vs,
The mass Mw of the water, the mass Ms when the fine aggregate is in the dry state, ρs is the density of the fine aggregate in the dry state, ρw is the density of water, and a is the air contained in the total volume Vf. Vs = (Mf-Vf (1-a / 100) .rhow) / (rhos-
ρw) Mw = (Vf (1-a / 100) -Vs) ρw Ms = Mf-Mw, and then from the mass Msw of the fine aggregate and the calculated Ms, the surface water ratio (Msw-Ms) / A method for measuring the surface water ratio of a fine aggregate, which comprises calculating Ms. 4. The mass Msw of the fine aggregate in a wet state is measured,
The fine aggregate is submerged in a predetermined container, the total mass Mf and the total volume Vf of the fine aggregate and water in the container are measured, and the total mass Mf and the total volume Vf of the fine aggregate are calculated. Volume Vs,
The mass Mw of the water, the mass Ms when the fine aggregate is in the dry state, ρs is the density of the fine aggregate in the dry state, ρw is the density of water, and a is the air contained in the total volume Vf. Vs = (Mf-Vf (1-a / 100) .rhow) / (rhos-
ρw) Mw = (Vf (1-a / 100) -Vs) ρw Ms = Mf-Mw, and the mass Msw of the fine aggregate and the calculated Ms
The surface water ratio (Msw-Ms) / Ms is calculated from the above, and then the fine aggregate and water in the container are used as a concrete material, and the fine aggregate lacking from the storage container storing the fine aggregate is calculated. A method for measuring a concrete material, comprising collecting and replenishing, and applying the surface water ratio to the collected fine aggregate to correct the amount of water.