JPS61164804A - Compensator for quantity of compounding of ready made concrete material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention predicts and calculates in advance the slump loss that occurs when mixed ready-mixed concrete is transported to the construction site, and increases or decreases the amount of slump loss according to the calculated amount of slump loss. The present invention relates to a device for correcting the mixing amount of a ready-mixed concrete material, which accurately obtains the correcting amount of the mixing amount of the ready-mixed concrete material.

[Prior art] Generally, a specific mix of ready-mixed concrete is specified in order to satisfy the strength, softness, air content, material separation resistance, capacity, etc. required at the construction site. Since the amounts of water, aggregate, admixtures, etc. are determined and specified under specified conditions, when actually using the materials, it is necessary to correct the surface water content of the aggregate and the particle size of the aggregate. Chiku Kyukyo 1 Ijinshi UΔh＾ ＃奔NAHI-s L-
However, even if the above-mentioned various corrections are made, there is a so-called slump due to the time lag and fluctuations such as temperature changes before the raised fresh concrete is transported to the construction site. This results in loss, resulting in the inconvenience that ready-mixed concrete with the performance specified by the specified mix cannot be transported to the construction site.

The causes of such inconvenience are listed below.

(1) In conventional surface water rate correction, even if the measured surface water rate value is applied as is and the unit water amount is adjusted, the slump loss value at the construction site of ready-mixed concrete does not meet the required level of construction. It often becomes impossible to do so. In other words, since ready-mixed concrete with many different mixes is transported to different ready-mixed concrete construction sites with different transport distances and outside temperature conditions during transport, the mix of mixes, manufacturing, and transport conditions vary depending on the ready-mixed concrete. The slump loss value at the construction site differs, causing problems in construction.

Therefore, the plant operator has no choice but to make adjustments based on his or her intuition to match the required slump 1 required for surface treatment depending on the formulation, manufacturing conditions, and transportation conditions. The reality is that this is not the case.

(2) Furthermore, depending on the fresh concrete, in order to reduce the unit water volume and obtain an appropriate slump, a water reducer is mixed in, or an admixture such as an AE agent is mixed in to entrain air bubbles. In particular, the latter type of air bubbles causes loss during transportation of fresh concrete, which causes rerun loss.

[Problem to be Solved by the Invention J The problem to be solved by the present invention is to predict and calculate the amount of slump loss in advance, which is considered impossible with the conventional correction as described above, and to calculate the amount of slump loss based on the calculated amount. The object of the present invention is to provide a device that compensates for slump loss by correcting the blended amount of materials.

Means for Solving Problem L] The specific means provided by the present invention is to compensate for slump loss that occurs when fresh concrete is transported to a construction site. The amount of slump loss is predicted and calculated in advance by human input and calculation processing, and based on the amount of slump loss calculated in this way, the amount of material blended (material blending correction amount) to be increased or decreased is calculated. , it is possible to automatically set the blend correction amount of this material in the weighing machine according to each material.

That is, the apparatus of the present invention has a specific mix selection means for selecting a specific mix prescribed for each type of ready-mixed concrete to be manufactured, the kneading temperature of the ready-mixed concrete, and the time required for the concrete to be transported to the construction site. a disturbance information supplying means for supplying disturbance information that causes slap loss of fresh concrete, such as transportation time and outside temperature of the route followed by the concrete to be transported to the construction site; Concrete is constructed as above m t
! & Lf layer, Genoki Gen ^1 In order to compensate for the slump loss amount, the mixture is calculated to calculate the mixing correction amount of the ready-mixed concrete material to be increased or decreased based on the above calculated slump loss amount. It is characterized by comprising a correction amount calculation means and a weighing machine that is set to a measured value according to the mixture correction amount calculated by the mixture correction amount calculation means.

[Function] In the device of the present invention, the plant mixture specified by the indicated mixture is corrected by the disturbance information that causes slump loss, and the measured value of the material to be increased or decreased is set in the weighing machine, so that the amount of ready-mixed concrete is Ready-mixed concrete can be mixed in consideration of compensation for slump loss that occurs during transportation.

Embodiment] FIG. 1 is a diagram corresponding to claims showing the configuration of the device of the present invention, and FIG. 4 is an example in which the configuration shown in FIG. 1 is applied to a batcher plant for producing ready-mixed concrete to more specifically illustrate
is a hydraulic combination selection means, which selects among a large number of hydraulic combinations prepared in advance.

From these, it is possible to select one that suits the ready-mixed concrete to be manufactured. 2 is the mixing temperature of fresh concrete,
This is a disturbance information supply means that supplies disturbance information that causes a slump loss, such as the time required for transportation to the construction site and the outside temperature during the transportation. In the embodiment, this means 2 is located within a hopper 6 (or within a mixer) containing mixed ready-mixed concrete 7, as shown in Figure $2.
Although it is constructed by combining a detection system consisting of a temperature sensor 21 installed at the top and an outside temperature sensor 22 that detects the temperature of the transport route, and a transport time setting device 23, it is possible to use an input device without using a detection system such as a sensor. A configuration may also be adopted in which a separate input device is provided and disturbance information is set using the provided input device.

The slump loss calculation hand and the material composition correction amount calculation means are both microcomputer system M.
It is composed of ICON. This microcomputer system has a basic configuration in combination with MIC, and the ROM stores programs necessary for controlling the present invention and functions necessary for control as described later, and the RAM temporarily stores data necessary for control. I am remembering it.

Next, the control procedure of the apparatus of the present invention will be explained with reference to the flowchart shown in FIG.

In step P1, the hydraulic mix selection means 1 is operated to select a hydraulic mix according to the fresh concrete to be produced.

In steps P2 and P3, the surface water of the aggregate to be actually used and the aggregate particle size are input. As a result, step P
In step 4, the plant mixture is calculated according to the input aggregate surface water and aggregate particle size.

Next, in steps P5 to P7, disturbance information that causes slump loss, such as mixing temperature of fresh concrete, outside air temperature, and conveyance time, is read, and in step P8,
A slump loss is calculated according to the disturbance information thus read. The amount of slump loss is the mixing temperature LL of fresh concrete, the outside air temperature L2 of the conveyance route. It is determined as a function based on the transportation time T to the site, and is expressed by the following formula (1
) is defined by

Δ St= αL Δt ” + β, ΔT ÷
γnt 2 (CIl)e... (1) However, α, β1, and γn are the type of cement (normal,
early strength, blast furnace, etc.) and types of admixtures (AE agent, A
Δt1 is the coefficient of slump loss per unit temperature difference, unit temperature, or unit time difference, which is determined by the combination of the water reducing agent, etc.) or the type of mixture (unit cement amount, unit water amount, water-cement ratio, etc.). Deviation between the standard temperature at the time of mix determination and the mixing temperature of ready-mixed concrete, t2
is the outside temperature of the fresh concrete conveyance path, and 8T is the elapsed time after mixing (transport time to the site).
When the slump loss amount ΔsL is calculated in this way,
In step P9, the unit amount of water to be increased to compensate for this is determined by the following equation (2).

Here, σ is a coefficient of increase in unit water amount per unit slump loss.

Next, in step PLO, the mixing correction amount of the amount of increase/decrease S and other materials is calculated in accordance with the unit water amount calculated above. When calculating the mixing correction amount in this case, the following points should be taken into account in order to compensate for slump without causing any fluctuation in the volume of the whole fresh concrete. That is, when calculating the increase in the amount of cement, the ratio of unit cement @c to unit water amount W is kept constant. Also, in order not to change the overall volume,
The amounts of sand S and gravel G are decreased without changing the fine aggregate ratio s/a (here, S indicates the absolute volume of sand, and a indicates the absolute volume of sand gravel). Furthermore, in order not to change the void % amount A, which is another factor that affects the amount of slump loss, the admixture: jit (M) is adjusted according to increases in cement ik (C) and changes in the temperature of finished concrete. Also calculate the amount.

In the step pH, the blending correction amount of each material calculated as described above is used as a measured value instruction signal.

As a result of the above, according to the device of the present invention, slump, which was difficult to compensate for when producing many types of ready-mixed concrete and supplying it to each construction site under the same transportation conditions as in conventional fixed plants, can be achieved. The loss is compensated for without changing the overall volume of the fresh concrete, and the fresh concrete retains the slump specified by the hydraulic mix even after transportation.

Finally, when the surface water correction device performs slump adjustment, the change in the amount of material blended is calculated using calculation examples, the problems are explained, and the results are used as data for determining the effectiveness of the device of the present invention.

(a) Calculation conditions The blending amount of the materials is a general construction concrete of strong I [180 Kgf/cml, slump loss 18C recommended, and the maximum size of coarse aggregate is an example of a 25-scale aggregate. The unit cement amount, unit water amount, unit fine aggregate amount, and unit coarse aggregate amount are indicated by C, W, S, and G, respectively, and the specific gravity of the materials used is assumed as follows.

3.1B 2.55 2.85
tKg/shoes 1W/Cs/a W
CS G Mixed phase agent (z) 82 48
．． 0 180 29G842 949 3.
18 Volume of fresh concrete with the above mix (also) V= Vll +VC+VS +VG +Vai
r= 180÷ 290/LlB+ 842/2.5
5+84U2-85÷40 1000[1/■'] Using this hydraulic combination example, the following conditions are set to simplify calculations. In the case of the actual measurement value of the fine aggregate surface water turbine of 0%, calculate the blending amount at the time of actual kneading when it is set to 3.0% for slump adjustment. However, for coarse aggregate surface water turbines, both the measured value and the set value are 0%.

(b) Effect of surface water wheel on fine aggregate S' = S x 1.03-843X 1.03=
8[17[Kgl However, S' is the correction amount of S [Kgl W'-W-(S' -5) = 180- (8B? -842) = 155[K
gl However, W' is the correction amount of W [Kgl V =, V 'W+ VC+ v 'S+ VG +
Vair = 155÷ 290/3.18.887/
2.55÷9413/2.85+40W/C=W'/C
X100 = 155 / 290 X 100 -53
．． 4%■゛S s/4 = X
100V'<+V'r 3411.0 = □×1 340.0 +358.1 = 48.7% As a result, if the surface water content of fine aggregate is set to a value that is ±3% different from the actual value, the Concrete volume is approximately 15J
2 changes, W/C changes by 8.8%, and S/a
It can be seen that there are some changes as well.

This change in unit water amount, +25 Kg/m3, is equivalent to 11 to 12 c wetness when converted to slump change value in the case of general concrete and the mix shown in the calculation example. With the composition shown in the calculation example, when using a unit water amount of 25 kg / m3 and an admixture, the slump ('1 m3) at the construction site
In order to ensure l B c ■, it is approximately equivalent to the amount of water used to correct the slump loss produced when a hydraulic mixture specified at 20°C is kneaded at 30°C and transported for about 1 hour under an outside temperature condition of 30°C.

Therefore, these conditions for producing and transporting ready-mixed concrete are conditions that frequently occur on a daily basis when producing and transporting ready-mixed concrete in a normal ready-mixed concrete factory, and in some cases, surfaces exceeding those shown in this calculation example may be used. It is easy to understand that the water wheel needs to be corrected and the operation is being carried out.The resulting change in W/C of 8.8% is equivalent to 45 to 65 kgf when converted to the strength of ordinary concrete.
This is a fluctuation equivalent to /cmaro2, which is a big problem.

[Effects of the invention 1 This is because the device of the present invention has one or more configurations.

The increase factor necessary to satisfy the fluctuation of W/C, which is the largest factor of variation in the strength of fresh concrete, under certain conditions (compared to when manufacturing with conventional equipment) can be kept small.
It is possible to reduce the amount of cement per unit, which is economical. In addition, the slump value, which is an absolute requirement for fresh concrete construction, and the workability of concrete are uniformized to the target values, so homogenized fresh concrete can exhibit good workability, making it durable and reliable. It is possible to construct high concrete structures.

Furthermore, fluctuations in weight, which is a basic requirement when trading as a commodity, can be significantly reduced compared to when using conventional manufacturing methods.

[Brief explanation of drawings]

Fig. 1 is a claim correspondence diagram of the device of the present invention, and Fig. 2 is a diagram corresponding to the claims of the device of the present invention.
FIG. 3 is a diagram illustrating a usage state of the apparatus of the present invention, which shows the configuration of the figure in more detail, and FIG. 3 is a flowchart showing a control procedure in the apparatus of the present invention. 1e◆ Temple indication hydraulic power selection means 2... Disturbance information supply means 3... Φ slump loss amount calculation means 4... Mixture correction amount calculation means 5... Weighing machine

Claims (1)

[Claims] An indication mix value selection means for selecting an indication mix specified for each type of ready-mixed concrete to be manufactured, the kneading temperature of the ready-mixed concrete, the transportation time required for the concrete to be transported to the construction site, and the concrete a disturbance information supply means for supplying disturbance information that causes a slump loss of the ready-mixed concrete, such as the outside air temperature along the route taken before it is transported to the construction site; A slump loss amount calculating means for predicting and calculating the amount of slump loss when being transported, and a mixing correction amount of the ready-mixed concrete material to be increased or decreased based on the calculated slump loss amount in order to compensate for the slump loss amount. A combination correction amount calculation means to be calculated;
A mixing amount correction device for a ready-mixed concrete material, characterized in that the device corresponds to a mixing correction amount calculated by the mixing correction amount calculating means.