JP3005518U - Drainage nozzle for container for concrete bleeding test equipment - Google Patents

Abstract

(57) [Summary] [Purpose] Even the water necessary for the hydration reaction is not excessively sucked out by the capillary phenomenon, and only the water that spontaneously floats from the sample in the container to the surface layer as the hydration reaction progresses. The purpose is to accurately grasp the state of hardening from the temporal change in the amount of drainage by sequentially sampling. [Configuration] in the upper end opening side of the sample container, the drainage nozzle 4 having a bent portion 4 ₃ bulged upward from the horizontal pipe portion 4 ₁ between the horizontal pipe portion 4 ₁ and the downcomer portion 4 ₂ to attach It can be attached and removed freely.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a bleeding test of concrete in which the amount of water discharged during hardening of freshly-mixed concrete or mortar is sequentially taken at regular intervals according to the measurement standards set by JIS (Japanese Industrial Standards) and measured. It relates to the drain nozzle of the equipment container.

[0002]

[Prior art]

 When concrete and mortar solidify, water other than the water required for the hydration reaction is released and floats on the surface, but the amount gradually decreases over time. Therefore, the measurement of the amount of water discharged per hour is based on the JIS standard, and a dedicated test device (for example, the attached drawing of the utility model registration application filed on Dec. 28, 1992 according to the applicant's prior application) The same as the concrete breathing test equipment shown in 2 and 3). Therefore, we first go to the construction site of the building, sample the concrete or mortar to be inspected, and store it in the predetermined sample container 1 as shown in FIG. 7 up to the height of the chain line L. The sample container 1 is held in a horizontal position (initial position), that is, the bottom surface of the container 1 is kept horizontal for a predetermined time, and then the container 1 is tilted at a predetermined angle for a predetermined time, so that the sample is held in the horizontal position. It measures the amount of water by letting the water floating on the surface flow out from the drainage nozzle 4'provided on the upper part of the container. These operations are automatically repeated according to the program set based on the JIS standard. , To obtain the total amount of water.

[0003]

[Problems to be solved by the device]

 However, the drainage nozzle of the sample container used in the above device is formed as shown in FIG. That is, the drainage nozzle 4 ′ mounted on the upper side of the sample container 1 extends in a generally horizontal direction, and then bends in a shape such that the tip end portion thereof easily flows downward. Holds the sample at a height up to the center (radius) of the inlet to the drainage nozzle, holds the sample container in a horizontal state, and leaves it standing for a certain period of time, so that the water that floats up during that time is kept above the sample. Although the water is stored once, not only the excess water in the process of hydration is floated up in the drain nozzle 4 ', but also the water necessary for the subsequent hydration reaction in the sample is constantly maintained. The sample is exuded by a capillary phenomenon and is drained through the drain nozzle 4 ', and as shown in the characteristic B of FIG. 5, the water in the sample is lost and depleted early without giving a sufficient time for the hydration reaction. As a result, it was not possible to promote the hydration reaction in the most natural state while maintaining the necessary water content for a sufficient time, and it was difficult to accurately grasp the state of hardening.

[0004]

[Means for solving the problem]

 At a position near the upper part of the sample container in which a fixed amount of sample is sampled and accommodated, a drain nozzle formed by bending the middle of the passage from the mounting position to the sample container to a middle height is attached.

[0005]

[Action]

 When the sample container containing the sample such as concrete or mortar is first left in a horizontal position (the bottom of the container is horizontal) for a certain period of time, the moisture in the sample gradually rises, but in the middle of the passage of the drainage nozzle. The water is stored without spilling because it bends in the middle height, and then by tilting the sample container at an angle equal to the bending angle of the drainage nozzle, only the water that has floated to the surface layer of the sample passes through the drainage nozzle to the outside. leak. After that, return the sample container to the initial posture and leave it for a certain period of time in the same manner as the previous time to prevent the floating water from inadvertently flowing out by upward bending of the drainage nozzle, and to keep the sample wet. Keep the time and collect and measure only the excess water that rises as the hydration reaction progresses.

[0006]

【Example】

The present invention will be described in detail below with reference to the embodiments shown in the drawings. First, the most gist of the present invention is to attach a drain nozzle to the upper part of a sample container 1 for storing sampled samples, as shown in FIG. A projecting edge 2 is provided outwardly, the tip of a drainage nozzle 4 is freely screwed into the projecting edge 2, and the filter 3 is brought into contact with the mouth end surface of the drainage nozzle 4 by the projecting edge 2 It is fitted inside and is aligned so that there is no step between it and the inner peripheral surface of the sample container 1. Drainage nozzle 4 forms a bent portion 4 ₃ by Uwamuka angle θ between the horizontal pipe portion 4 ₁ for connection to the drain outlet flange 2 and the downward pipe portion 4 ₂ a bent portion 4 _third angle θ, for example about 30 degrees (in particular not limited to this angle), after being allowed to stand the sample container 1 to the normal state by forming a counter-bent portion thereon, drain outlet There is a height difference h between the drainage position of the ridge 2 and the highest drainage position of the drainage nozzle 4. Thus moisture middle by the forming an upward bent portion 4 ₃ samples of the drainage nozzle is between accumulated et until tilting the specimen container also appear in the surface layer portion floats, hydrated The water in the sample necessary for the reaction is not washed away. Next, an outline of an apparatus for performing the bleeding test by setting the sample container 1 will be described. As shown in FIGS. 2 and 3, the bleeding test apparatus 7 includes one end portion of the support tray 8 on which the sample container 1 is placed. The support tray 8 is pivotally mounted on the machine base 6 by a shaft 9 so as to be freely tilted, and the lower surface of the other end of the support tray 8 is in contact with the upper end of a pushing rod 10 which is vertically moved by a drive device installed in the machine base 6. In contact with each other, the sample container 1 is inclined from the horizontal state to a predetermined angle.

A series of operations will be described below. First, in the sample container 1, a sample such as fresh concrete or mortar sampled for inspection at a construction site of a building is measured, that is, a line L (upper end of a normal container). The height is minus 3 cm from the edge, and the position is equivalent to the height of the radius of the drainage port ridge 2) and is stored with a trowel finish. Weigh in advance and then seal with a top lid. Then, the sample container 1 is allowed to stand on the support tray 8, a drain hose is connected to the tip of the drain nozzle 4, and each part of the recording control device 5 is set to the test start mode to complete the preparation.

[0008] The entire test is automatically carried out by a program set according to the conditions defined by the JIS standard. That is, when 8 minutes have elapsed from the start of measurement, the drive device operates to raise the push rod 10 and push one end of the support tray 8 by the height H (5 cm) as shown in FIG. 1 also inclines. Therefore, the water content that has floated and accumulated on the sample surface during the 8 minutes elapsed from the start of measurement until the support tray 8 is tilted, the height difference h becomes zero by tilting the sample container 1 for 2 minutes (that is, By keeping that posture, water on the surface is collected through the drain nozzle 4 and drain hose (not shown), and then the support tray 8 is returned to the initial posture and the same operation is repeated again. Repeat the test every 10 minutes for 1 hour, and then repeat the test every 30 minutes for 24 hours (one day and night).

Therefore, when the drainage nozzle 4 in the present invention supports the support tray 8 horizontally, a height difference h is formed in the middle of the drainage nozzle, so that the sample can be used even near the radius of the drainage port. Even if the sample contains water, the water in the sample does not flow out unless the sample container is tilted, and therefore the wetness necessary for the hydration reaction is always maintained, and the amount of water collected gradually reduces the excess water during the hydration reaction. Therefore, it is naturally reduced with each bleeding, but it can be collected over a long period of time, and changes slowly as shown by characteristic A in FIG. 5, and ideal (JIS) experimental results are obtained.

Further, even if the sample container 1 equipped with the conventional drainage nozzle 4'shown in FIG. 7 is used, if the sample container is manually operated, an ideal breeding similar to the characteristic A in FIG. 5 is performed. The characteristics are obtained. In the case of manual operation, since the sample container 1 is inclined by the height H (50 mm) defined by JIS, the operation timing of the sample container is shown in FIG. Like In other words, in order to place a spacer with a height of 50 mm at a predetermined position of the sample container 1, one of the sample containers is sufficiently higher than the spacer height (about 100 mm) because the sample is a heavy object and it is not easy to work with a small hand. Up) (about 1 second), place the spacer in the specified position in this state (about 1 second), then gently loosen the tilt of the sample container and guide it to the predetermined tilt (height 50 mm) (1 second), and is performed in about 3 seconds in total. The effect of such a manual operation on the initial stage of the curing sample is that the sample container is tilted excessively by the manual operation, causing the sample surface layer to move in the direction of the drainage port (this deformation becomes horizontal). When it is returned, it becomes a bulge near the drainage port) and turbulence occurs inside the layer. In this state, even if the sample container is returned to the original horizontal state, the capillary phenomenon is less likely to occur and no unintended loss is observed. From this fact, the drainage nozzle of the present invention has found that an ideal bleeding characteristic can be obtained by preventing the flowout due to the capillary phenomenon in the horizontal state by some means.

[0011]

[Effect of device]

 According to the present invention, the upward bending portion is formed in the middle of the drainage nozzle as described above, and therefore, even if the water floats to the upper layer of the sample while the sample container is supported horizontally, the capillary phenomenon causes a problem. It does not allow the sample to be washed away early, so that the moisture inside the sample is maintained for a long time, and the moisture necessary for the complete hydration reaction of the sample such as concrete or mortar is maintained and the bleeding is maintained. It is possible to clearly grasp the state of hardening of the sample by collecting only the excess water discharged during the progress of the hydration reaction successively for a long time.

[Brief description of drawings]

FIG. 1 is a partially enlarged vertical side view showing a state in which a drainage nozzle of the present invention is attached to a sample container.

FIG. 2 is a front view of a bleeding test device.

FIG. 3 is a left side view of the testing device of the above.

FIG. 4 is a schematic side view showing a tilted state of a sample container.

FIG. 5: Comparison diagram of bleeding characteristics between the present invention and a conventional drainage nozzle

FIG. 6 is an operation timing chart when the sample container of the conventional example is manually operated.

FIG. 7 is a partial vertical sectional side view showing a state in which a drainage nozzle of a conventional example is mounted.

[Explanation of symbols]

1 Sample Container 2 Drainage Port Edge 4 Drain Nozzle 4 ₁ Horizontal Pipe 4 ₂ Down Pipe 4 ₃ Bent h Height Difference

Claims (1)

[Scope of utility model registration request] 1. A test device in which a fixed amount of a sample sampled in a sample container is sequentially sampled at predetermined intervals of water discharged during the hydration reaction to examine the curing characteristics. A drainage nozzle for a container for a concrete bleeding test device, characterized in that a middle of a passage of a drainage nozzle attached to the container is bent upward and higher than a mounting position on the sample container.