JP4096285B2 - Method for measuring surface water ratio of aggregate and measuring method of concrete material using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for measuring the surface water ratio of a fine aggregate in order to correct the amount of water when measuring a concrete material, and a method for measuring a concrete material using the method.
[0002]
[Prior art]
When mixing concrete on site, the amount of water has a large effect on the concrete strength and so on, so it is necessary to manage it thoroughly during mixing. However, the aggregate, which is a mixed material, has a different moisture content depending on its storage conditions and climatic conditions. When the wet aggregate is used, the amount of water in the concrete increases by the amount of surface water of the aggregate, and when the aggregate in the dry state is used, the amount of water in the concrete decreases by the effective water absorption.
[0003]
For this reason, it is extremely important to maintain the quality of concrete by correcting the amount of water at the time of mixing according to the degree of dryness and wetness of the aggregate and producing concrete as indicated.
[0004]
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 called the surface water ratio. However, since stored aggregates, especially fine aggregates, are often wet, the surface water ratio is measured in advance as an indicator of the degree of dryness and wetness of the aggregates, and is mixed based on the measured values. It is common to adjust the amount of water.
[0005]
And, the measurement of such a surface water ratio is to collect a small amount of sample from a storage container called a stock bottle in which fine aggregates are conventionally stored, measure its mass and the mass in an absolutely dry state, It calculated using these measured values and the water absorption of the surface dry state measured beforehand.
[0006]
[Problems to be solved by the invention]
However, in such a measurement method, the total surface water percentage is only estimated from a small number of samples, so there is a limit in terms of accuracy. Therefore, it is not practical in terms of economy and time to collect an amount close to the amount actually used and use it as a sample.
[0007]
In addition, in order to make up for such a problem, there are cases where an operator visually confirms the mixing state or adjusts the mixing water amount by referring to the load current of the mixer, but such a method may be adopted. The method itself has low accuracy, and eventually, a large safety factor of about 20% in terms of strength has to be expected, resulting in a problem that the composition becomes uneconomical.
[0008]
The present invention has been made in consideration of the above-described circumstances, and provides a method for measuring the surface water ratio of an aggregate capable of accurately measuring the surface water ratio of a fine aggregate and a method for measuring a concrete material using the same. For the purpose.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the method for measuring the surface water ratio of the aggregate according to the present invention measures the amount of water M _I introduced into a predetermined container as described in claim 1, aggregate by submerged into the vessel together with the water and water-immersed aggregate, were weighed total mass M _f and the total volume V _f of the water-immersed aggregate in the container, the total mass M _f and said total volume From V _f , the mass M _w of the water in the water-immersed aggregate and the mass M _a when the aggregate is in the surface dry state, ρ _a is the density of the aggregate in the surface dry state, and ρ _w is the water As density, M _a + M _w = M _f (1)
M _a / ρ _a + M _w / ρ _w = V _f (2)
Then, the mass M _aw of the wet aggregate is calculated as _follows :
M _aw = M _f −M _I (3)
Calculated from, and calculates the surface water rate _{(M aw -M a) / M} a from the mass M _aw and the calculated M _a of the aggregate of the calculated the wet state.
[0010]
Also, weighing of the concrete material according to the present invention as described in claim 2, weighed input amount M _I of water are introduced into a predetermined container, the container aggregate wet with the water Submerged in water to form a water-immersed aggregate, the total mass M _f and the total volume V _f of the water-immersed aggregate in the container are measured, and the water-immersed bone is calculated from the total mass M _f and the total volume V _f. The mass M _w of water in the aggregate, the mass M _a when the aggregate is in a dry state, ρ _a as the density of the aggregate in the dry state, and ρ _w as the density of water, M _a + M _w = M _f (1)
M _a / ρ _a + M _w / ρ _w = V _f (2)
Then, the mass M _aw of the wet aggregate is calculated as _follows :
M _aw = M _f −M _I (3)
Calculated from calculated surface water rate _{(M aw -M a) / M} a from the mass M _aw and the calculated M _a of the calculated aggregate of the wet state, then the aggregate in the container and Water is used as a concrete material, and a shortage of aggregate is collected from a storage container in which the aggregate is stored, and the amount of water is corrected by applying the surface water ratio to the collected aggregate. It is.
[0013]
The surface water ratio measurement method for a bone material according to the present invention, the air amount of the water-immersed in aggregate as a (%), in place of the V _f, · V _f a (1-a / 100) It is what is used.
[0014]
Also, weighing of the concrete material according to the present invention, the air amount of the water-immersed in aggregate as a (%), in place of the V _f, but using _{· V f (1-a /} 100) is there.
[0015]
In the aggregate surface water ratio measuring method and the concrete material measuring method using the aggregate according to the reference invention, first, the mass M _aw of the aggregate in a wet state is measured.
[0016]
Next, the aggregate is submerged in a predetermined container to form a water-immersed aggregate, and in this state, the total mass M _f and the total volume V _f of the water-immersed aggregate in the container are measured. Weighing is performed with air exhausted from the container.
[0017]
Next, from the total mass M _f and the total volume V _f , the mass M _w of the water in the water-immersed aggregate and the mass M _a when the aggregate is in the surface dry state, ρ _a in the surface dry state Aggregate density, ρ _w as water density, M _a + M _w = M _f (1)
M _a / ρ _a + M _w / ρ _w = V _f (2)
Calculate from
[0018]
Then, to calculate the surface water rate _{(M aw -M a) / M} a from the mass M _aw and the calculated M _a bone material in the wet state.
[0019]
In this way, since it becomes possible to measure the surface water content of the aggregate with respect to the amount used for concrete blending, for example, one batch or an amount close thereto, not to a small amount as in the past, The surface water percentage of the aggregate can be calculated accurately.
[0020]
Claim 1, in the weighing of the surface water ratio measurement method for a bone material according to claim 2 and concrete material using the same, first, weighed input amount M _I of water are introduced into a predetermined container.
[0021]
Next, the measured water is submerged in the container together with the aggregate in a wet state to form a submerged aggregate, and in this state, the total mass M _f and the total volume V _f of the submerged aggregate in the container are measured. To do. Weighing is performed with air exhausted from the container.
[0022]
Next, from the total mass M _f and the total volume V _f , the mass M _w of the water in the water-immersed aggregate and the mass M _a when the aggregate is in the surface dry state, ρ _a in the surface dry state Aggregate density, ρ _w as water density, M _a + M _w = M _f (1)
M _a / ρ _a + M _w / ρ _w = V _f (2)
Calculate from
[0023]
Next, the mass M _aw of the aggregate in the wet state is
M _aw = M _f −M _I (3)
Calculate from
[0024]
Then, to calculate the surface water rate _{(M aw -M a) / M} a from the mass M _aw and the calculated M _a of the aggregate of the calculated wet.
[0025]
In this way, since it becomes possible to measure the surface water content of the aggregate with respect to the amount used for concrete blending, for example, one batch or an amount close thereto, not to a small amount as in the past, The surface water percentage of the aggregate can be calculated accurately.
[0026]
In each of the inventions according to claim 1 and claim 2, the container for submerging the aggregate is arbitrary, but if the container used for measuring the concrete material is used, the amount corresponding to the blending unit of concrete, that is, one batch. Can be measured at once.
[0027]
Note that the aggregate and water in the container have already been measured in the process of measuring the surface water percentage, so these aggregates and water can be used as concrete materials as they are without being measured again. it can. If the amount of water is corrected using the above-described water mass M _w at that time, on-site blending can be performed as shown or close to the blend.
[0028]
The amount of aggregate and water in the container is preferably one batch or an amount close to it, which is preferable in terms of accuracy, but it is possible to do this. Compared to the surface water content measurement method, a much larger amount of aggregate is targeted, and sufficient accuracy improvement can be achieved.
[0029]
The amount of aggregate and water in the container is basically arbitrary as described above, and does not need to be adjusted to a unit for mixing concrete, for example, one batch. Therefore, the aggregate and water used for measuring the surface water ratio may be insufficient to mix, for example, one batch of concrete. You just need to replenish.
[0030]
Here, in order to replenish the deficient aggregate, the aggregate and water in the container described above are used as a concrete material, and the deficient aggregate is collected and replenished from the storage container in which the aggregate is stored. The amount of water is corrected by applying the surface water ratio to the collected aggregate.
[0031]
If it does in this way, water quantity correction | amendment can be performed, without measuring the surface water rate of the newly extract | collected aggregate again. If the aggregate is stored in the same storage container as the aggregate on which the surface water ratio is calculated, the surface water ratio is considered to be equivalent to the previously calculated surface water ratio. However, it is based on the idea that there is no problem in the quality of concrete.
[0032]
The aggregate of the present invention is mainly intended for fine aggregates, but it goes without saying that the present invention can also be applied to coarse aggregates.
[0033]
Here, if the amount of air a (%) in the water-immersed aggregate is taken into consideration, the known total capacity _Vf is multiplied by (1-a / 100), and this is set to the total capacity again. More accurate weighing is possible with the actual total capacity excluding the air volume.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an aggregate surface water ratio measuring method and a concrete material measuring method using the same according to the present invention will be described below with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.
[0035]
(First embodiment)
[0036]
FIG. 1 is a flowchart showing a procedure of an aggregate surface water percentage measuring method according to the present embodiment. As can be seen from the figure, in the aggregate surface water percentage measuring method according to the present embodiment, first, the mass M _aw of the fine aggregate in a wet state is measured (step 101). Here, as an amount of fine aggregate, an amount necessary for blending one batch of concrete is used as a guide. For example, it is desirable to add the total amount required for a batch of concrete mix.
[0037]
Next, the fine aggregate is submerged in a predetermined container to form a water-immersed aggregate (step 102), and in this state, the total mass M _f and the total volume V _f of the water-immersed aggregate in the container are measured ( Step 103). In order to prevent the total volume V _f from being measured when air bubbles are contained in the container, care should be taken to prevent air from entering as much as possible when adding water, and if necessary, vibration should be applied to the container to remove air bubbles. Kick out.
[0038]
Here, if the container used for measuring the concrete material is used as the container for submerging the fine aggregate, it is possible to measure the blending unit of concrete, that is, the amount corresponding to one batch.
[0039]
Next, from the measured total mass M _f and total volume V _f , the mass M _w of water in the water-immersed aggregate and the mass M _a when the fine aggregate is in the surface dry state, and ρ _{a the} surface dry M _a + M _w = M _f (1) where ρ _w is the density of fine aggregate in the state, ρ _w
M _a / ρ _a + M _w / ρ _w = V _f (2)
(Step 104).
[0040]
Then, to calculate the surface water rate (M _aw -M _a) / M _a from the mass M _aw and the calculated M _a fine aggregate in a wet state (step 105).
[0041]
As described above, according to the method for measuring the surface water content of the aggregate according to the present embodiment, the amount used for concrete blending, for example, one batch or close to it, is not a slight amount as in the past. Since the surface water ratio of the fine aggregate can be measured with respect to the amount, the surface water ratio of the fine aggregate can be accurately calculated.
[0042]
Therefore, if such a fine aggregate is used as a concrete material, it is possible to accurately correct the amount of water related to the surface water of the fine aggregate, and to improve the quality of the concrete.
[0043]
In the present embodiment, the amount of fine aggregate to be measured is used as a guide for the amount of fine aggregate to be measured so that the measurement accuracy of the surface water ratio is high, but it is not always necessary to measure the amount, for example, The surface water content may be measured for half of one batch. Even in such a case, a much larger amount of fine aggregate is targeted as compared with the conventional surface water ratio measurement method, and the surface water ratio of the fine aggregate can be measured with sufficient accuracy.
[0044]
Further, in the present embodiment, detailed mention was not made in submerging the wet fine aggregate in the container, but water may be put into the container used for measuring the mass of the wet fine aggregate. Alternatively, a wet fine aggregate that has been weighed may be put into a container containing water.
[0045]
In the present embodiment, the air amount a (%) in the water-immersed aggregate is not taken into consideration. However, if the air amount a (%) is taken into consideration, the total capacity V _{f is set} to (1−a / 100) and renewing this to the full capacity enables more accurate weighing with the actual full capacity excluding the air volume.
[0046]
Specifically, instead of the formula (2), the formula (2 ′), that is, M _a / ρ _a + M _w / ρ _w = V _f · (1−a / 100) (2 ′)
May be used.
[0047]
(Second Embodiment)
[0048]
FIG. 2 is a flowchart showing the procedure of the concrete material measurement method according to the present embodiment. As can be seen from the figure, the concrete material measurement method according to the present embodiment assumes that the fine aggregate or water whose surface water ratio has been 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 of the first embodiment, the description thereof is omitted here.
[0049]
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, but the fine aggregate and water in the container are, as described above, the surface water ratio. Since the measurement has already been completed in the process of measuring, there is no need to measure again.
[0050]
When the fine aggregate and water in the container are used as the concrete material, it is conceivable that the fine aggregate and water alone are insufficient to mix, for example, one batch of concrete.
[0051]
First, when water is insufficient, the amount of water is corrected using the mass _Mw of water calculated in the first embodiment. That is, water is newly replenished by the amount obtained by subtracting the mass _Mw of water from the blending amount shown in the formula blending (step 106).
[0052]
On the other hand, if there is a shortage of fine aggregate, the short aggregate is collected and replenished from the storage container in which the fine aggregate used for measuring the surface water ratio is stored. Is applied to the surface water rate to correct the amount of water (step 107).
[0053]
In this way, the water amount can be corrected without measuring the surface water ratio of the newly collected fine aggregate again.
[0054]
Next, concrete is produced using the fine aggregate and water in the container and their replenishment as a concrete material (step 108). Needless to say, when manufacturing concrete, cement, coarse aggregate, admixture, and other concrete materials must be weighed so as to follow the indicated composition.
[0055]
As described above, according to the concrete material measurement method according to the present embodiment, the fine aggregate and water in the container have already been measured in the process of measuring the surface water ratio, so that the measurement is performed again. The fine aggregate and water can be used as they are as a concrete material. And if the amount of water is corrected using the mass _{Mw of} the water obtained in the process of calculating the surface water ratio, blending according to the indicated blending becomes possible.
[0056]
Further, according to the concrete material measuring method according to the present embodiment, when the fine aggregate is insufficient, the short aggregate is collected from the storage container in which the fine aggregate whose surface water ratio is measured is stored. The amount of water was corrected by applying the surface water ratio to the collected fine aggregate, so that the amount of water was corrected without measuring the surface water ratio of the newly collected fine aggregate again. It can be performed.
[0057]
(Third embodiment)
[0058]
FIG. 3 is a flowchart showing the procedure of the aggregate surface water ratio measuring method according to the present embodiment. As can be seen in the figure, in the surface water ratio measurement method for a bone material according to the present embodiment, first, weighed input amount M _I of water are introduced into a predetermined container (step 111).
[0059]
Next, the weighed water is submerged in the above-mentioned container together with the fine aggregate in a wet state to form a water-immersed aggregate (step 112), and in this state, the total mass M _f of the water-immersed aggregate in the container and The total volume V _f is measured (step 113). Here, as an amount of fine aggregate, an amount necessary for blending one batch of concrete is used as a guide. For example, it is desirable to add the total amount required for a batch of concrete mix.
[0060]
In order to prevent the total volume V _f from being measured when air bubbles are contained in the container, care should be taken to prevent air from entering as much as possible when adding water, and if necessary, vibration should be applied to the container to remove air bubbles. Kick out.
[0061]
Here, if the container used for measuring the concrete material is used as the container for submerging the fine aggregate, it is possible to measure the blending unit of concrete, that is, the amount corresponding to one batch.
[0062]
Next, from the measured total mass M _f and total volume V _f , the mass M _w of water in the water-immersed aggregate and the mass M _a when the fine aggregate is in the surface dry state, and ρ _{a the} surface dry M _a + M _w = M _f (1) where ρ _w is the density of fine aggregate in the state, ρ _w
M _a / ρ _a + M _w / ρ _w = V _f (2)
(Step 114).
[0063]
Next, the mass M _aw of the aggregate in the wet state is
M _aw = M _f −M _I (3)
Calculated from (step 115), then calculate the surface water rate (M _aw -M _a) / M _a from the mass M _aw and the calculated M _a fine aggregate of the calculated wet (step 116) .
[0064]
As described above, according to the method for measuring the surface water content of the aggregate according to the present embodiment, the amount used for concrete blending, for example, one batch or close to it, is not a slight amount as in the past. Since the surface water ratio of the fine aggregate can be measured with respect to the amount, the surface water ratio of the fine aggregate can be accurately calculated.
[0065]
Therefore, if such a fine aggregate is used as a concrete material, it is possible to accurately correct the amount of water related to the surface water of the fine aggregate, and to improve the quality of the concrete.
[0066]
In the present embodiment, the amount of fine aggregate to be measured is used as a guide for the amount of fine aggregate to be measured so that the measurement accuracy of the surface water ratio is high, but it is not always necessary to measure the amount, for example, The surface water content may be measured for half of one batch. Even in such a case, a much larger amount of fine aggregate is targeted as compared with the conventional surface water ratio measurement method, and the surface water ratio of the fine aggregate can be measured with sufficient accuracy.
[0067]
In the present embodiment, the air amount a (%) in the water-immersed aggregate is not taken into consideration. However, if the air amount a (%) is taken into consideration, the total capacity V _{f is set} to (1−a / 100) and renewing this to the full capacity enables more accurate weighing with the actual full capacity excluding the air volume.
[0068]
Specifically, instead of the formula (2), the formula (2 ′), that is, M _a / ρ _a + M _w / ρ _w = V _f · (1−a / 100) (2 ′)
May be used.
[0069]
(Fourth embodiment)
[0070]
FIG. 4 is a flowchart showing the procedure of the concrete material measurement method according to the present embodiment. As can be seen from the figure, the concrete material measurement method according to the present embodiment assumes a case where fine aggregate or water whose surface water ratio has been calculated by the procedure described in the third embodiment is used as it is for the concrete material. Since the procedure (steps 111 to 116) until the surface water ratio is calculated is the same as that of the third embodiment, the description thereof is omitted here.
[0071]
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, but the fine aggregate and water in the container are, as described above, the surface water ratio. Since the measurement has already been completed in the process of measuring, there is no need to measure again.
[0072]
When the fine aggregate and water in the container are used as the concrete material, it is conceivable that the fine aggregate and water alone are insufficient to mix, for example, one batch of concrete.
[0073]
First, when water is insufficient, the amount of water is corrected using the mass _Mw of water calculated in the third embodiment. That is, water is newly replenished by the amount obtained by subtracting the mass _Mw of water from the blending amount shown in the formula blending (step 117).
[0074]
On the other hand, if there is a shortage of fine aggregate, the short aggregate is collected and replenished from the storage container in which the fine aggregate used for measuring the surface water ratio is stored. Is applied to the surface water ratio to correct the amount of water (step 118).
[0075]
In this way, the water amount can be corrected without measuring the surface water ratio of the newly collected fine aggregate again.
[0076]
Next, concrete is produced using the fine aggregate and water in the container and their supplements as a concrete material (step 119). Needless to say, when manufacturing concrete, cement, coarse aggregate, admixture, and other concrete materials must be weighed so as to follow the indicated composition.
[0077]
As described above, according to the concrete material measurement method according to the present embodiment, the fine aggregate and water in the container have already been measured in the process of measuring the surface water ratio, so that the measurement is performed again. The fine aggregate and water can be used as they are as a concrete material. And if the amount of water is corrected using the mass _{Mw of} the water obtained in the process of calculating the surface water ratio, blending according to the indicated blending becomes possible.
[0078]
Further, according to the concrete material measuring method according to the present embodiment, when the fine aggregate is insufficient, the short aggregate is collected from the storage container in which the fine aggregate whose surface water ratio is measured is stored. The amount of water was corrected by applying the surface water ratio to the collected fine aggregate, so that the amount of water was corrected without measuring the surface water ratio of the newly collected fine aggregate again. It can be performed.
[0079]
【The invention's effect】
As described above, according to the aggregate surface water ratio measuring method of the present invention according to claim 1, it is possible to accurately calculate the surface water ratio of the aggregate. Therefore, if such an aggregate is used as a concrete material, it becomes possible to accurately correct the amount of water related to the surface water of the aggregate, and the quality of the concrete can be improved.
[0080]
Further, according to the concrete material measuring method of the present invention according to claim 2, since the measurement of the aggregate and water in the container has already been completed in the process of measuring the surface water ratio, it should be measured again. These aggregates and water can be used as concrete materials as they are. And if the amount of water is corrected using the mass _{Mw of} the water obtained in the process of calculating the surface water ratio, blending according to the indicated blending becomes possible. In addition, when the aggregate is insufficient, the water amount can be corrected without measuring the surface water rate of the newly collected aggregate again.
[0081]
[Brief description of the drawings]
FIG. 1 is a flowchart showing a procedure of an aggregate surface water percentage measuring method according to a first embodiment.
FIG. 2 is a flowchart showing a procedure of a concrete material measurement method according to a second embodiment.
FIG. 3 is a flowchart showing a procedure of an aggregate surface water percentage measuring method according to a third embodiment.
FIG. 4 is a flowchart showing a procedure of a concrete material measurement method according to a fourth embodiment.

Claims (4)

The amount of water M _I to be charged in a predetermined container is measured, and the wet aggregate is submerged in the container together with the water to form a water-immersed aggregate. The mass M _f and the total volume V _f are measured, and from the total mass M _f and the total volume V _f , the mass M _w of water in the water-immersed aggregate and the mass when the aggregate is in a surface dry state the M _a, the density of the aggregate of the [rho _a in-dry state, M and [rho _w as the density of water _{a + M w = M f (} 1)
M _a / ρ _a + M _w / ρ _w = V _f (2)
Then, the mass M _aw of the wet aggregate is calculated as _follows :
M _aw = M _f −M _I (3)
Calculated from surface water rate from the mass M _aw and the calculated M _a of the aggregate of the calculated the wet state (M _aw -M _a) / surface water aggregate and calculates the M _a Rate measurement method. The amount of water M _I to be charged in a predetermined container is measured, and the wet aggregate is submerged in the container together with the water to form a water-immersed aggregate. The mass M _f and the total volume V _f are measured, and from the total mass M _f and the total volume V _f , the mass M _w of the water in the water-immersed aggregate and the mass when the aggregate is in the surface dry state. the M _a, the density of aggregate-dry state [rho _a, M a [rho _w as the density of water _{a + M w = M f (} 1)
M _a / ρ _a + M _w / ρ _w = V _f (2)
Then, the mass M _aw of the wet aggregate is calculated as _follows :
M _aw = M _f −M _I (3)
Calculated from calculated surface water rate _{(M aw -M a) / M} a from the mass M _aw and the calculated M _a of the calculated aggregate of the wet state, then the aggregate in the container and Using water as a concrete material, collecting and replenishing insufficient aggregate from the storage container in which the aggregate is stored, and correcting the amount of water by applying the surface water ratio to the collected aggregate A method for measuring concrete material characterized by the above. The air quantity of the water-immersed in aggregate as a (%), the place of the _{V f, V f · (1} -a / 100) surface water ratio measurement method for a bone material according to claim 1, wherein using. The air quantity of the water-immersed in aggregate as a (%), the V instead of _{f, V f · (1-} a / 100) weighing of the concrete material according to claim 2 wherein used.

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