A device and method for detecting the setting time of foamed concrete

Abstract

The application discloses a kind of detection device and detection method of foam concrete setting time, device includes the base for placing the test module, test module top opening, at least one side is detachable face, device further includes: support assembly, including longitudinal piece and cantilever piece, one end of cantilever piece is fixedly connected with longitudinal piece upper end, wherein longitudinal piece lower end is fixedly connected with base, longitudinal piece has height adjusting structure on it;Connecting piece, rotationally connects the other end of cantilever piece, the threaded hole is provided on the connecting piece, and the threaded hole is used to connect initial setting rod or final setting test box;Height adjusting structure upper side portion of longitudinal piece is installed with detachable limiting arm.The setting time of foam concrete prepared by chemical foaming method is tested by the device and method of the application, and the scientificity and accuracy are comprehensively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a concrete setting time testing device and method, in particular to a foamed concrete setting time detection device and detection method. BACKGROUND

[0002] Foamed concrete is mainly composed of calcareous materials (cement, lime) and siliceous materials (granulated blast furnace slag, fly ash, etc.) with appropriate admixtures, etc. After batching, mixing, pouring, foaming and cutting, it is a porous super-light material. Foamed concrete is distributed with a large number of micro voids, and its density is much lower than that of ordinary concrete. In particular, the density of foamed concrete prepared by chemical foaming method is lower.

[0003] The chemical foaming method for preparing foamed concrete is to add a chemical foaming agent to cement and other materials, so that it reacts with the material itself to release gas and foam. The chemical foaming method has the characteristics of convenient foaming, high foaming efficiency, abundant and stable foam, and is convenient for adjusting the amount of bubble generation and producing low-density products. And the foamed concrete prepared by the chemical foaming method will have a "bread head" after the foaming is finished, and the setting time is no longer suitable for testing with a Vicat instrument.

[0004] The traditional test of cement-based material setting time uses a Vicat instrument for testing, which is mainly used to detect the setting time of cement paste. However, because the Vicat instrument test rod is heavy, the penetration force generated will directly penetrate the foamed concrete containing a large number of pores. Therefore, the Vicat instrument is no longer suitable for testing the setting time of foamed concrete.

[0005] The current situation of foamed concrete setting time disclosed in the literature is as follows:

[0006] Chinese invention patent No. CN108645754A discloses a foamed concrete initial setting time testing device and method. This invention only regulates the initial setting time of foamed concrete prepared by physical foaming method, does not involve the final setting time determination, and the system is significantly different from the present application.

[0007] The Chinese invention patent publication number CN216870289U discloses a low-density foam concrete setting time measuring device. The patent uses a test ring to test the setting time of foam concrete, but it is not suitable for foam concrete prepared by chemical foaming method. Because the "bread head" of foam concrete prepared by chemical foaming method has a certain slope, the slurry will overflow from the gap of the connecting rod during the test process, resulting in inaccurate and unscientific initial setting time measurement. At the same time, during the test of final setting time, the connecting piece will first touch the foam concrete, which will result in that the test ring cannot completely touch the slurry (small stress area), and finally the data of the final setting time will be too large. Therefore, the device is not suitable for testing foam concrete prepared by chemical foaming method. SUMMARY

[0008] The purpose of the present application is to solve the problem of the lack of a scientific device for testing the setting time of foam concrete prepared by chemical foaming method in the prior art, and to provide a device for testing the setting time of foam concrete prepared by chemical foaming method.

[0009] The technical problem to be solved by the present application is to provide a method for testing the setting time of foam concrete prepared by chemical foaming method using the above-mentioned device. The method uses gravity and the inertia of the device components to scratch the "bread head" of the foam concrete, which can effectively avoid the phenomenon of the connecting ring of the Vicat apparatus penetrating the foam concrete vertically.

[0010] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: a device for testing the setting time of foam concrete prepared by chemical foaming method includes a base for placing a test mold, an opening above the test mold, and at least one side face that is detachable. The device further includes a support assembly including a longitudinal member and a cantilever member, one end of the cantilever member being fixedly connected to the upper end of the longitudinal member, wherein the lower end of the longitudinal member is fixedly connected to the base, and the longitudinal member has a height adjustment structure on the upper end;

[0011] A connecting piece is rotatably connected to the other end of the cantilever member, and a threaded hole is provided on the connecting piece for connecting an initial setting rod or a final setting test box;

[0012] A detachable limiting arm is installed on the longitudinal member of the upper side of the height adjustment structure.

[0013] The height adjustment structure is a expansion joint, and the longitudinal member includes a first pipe member located above and a second pipe member located below, the first pipe member being sleeved on the upper end of the second pipe member, and a positioning bolt being provided on the first pipe member.

[0014] The initial setting rod has a smooth rod member at one end and a threaded end at the other end for connecting with the threaded hole on the connecting piece.

[0015] The final setting test box comprises a test box body, and a drawer plate is arranged at the lower end of the test box body.

[0016] The connecting piece is provided with a through hole matched with the long nose, and the connecting piece is installed in cooperation with the cantilever piece.

[0017] The base is provided with two clamping strips arranged in parallel and used for limiting the mold on both sides, and at least one clamping strip is marked with a scale line.

[0018] The application further discloses a detection method for the setting time of the foamed concrete.

[0019] Step 1, after the foamed concrete slurry prepared by the chemical foaming method is stirred, the slurry is poured into a mold for foaming, and a bread head is formed.

[0020] Step 2, an initial setting rod is installed, and the expansion joint is adjusted so that the bottom end of the initial setting rod is tangent to the curved edge of the bread head.

[0021] Step 3, an external force is applied to tightly attach the initial setting rod to the limiting arm.

[0022] Step 4, the external force is released to make the initial setting rod freely swing, and whether the foamed concrete has been initially set is judged according to the scratch on the bread head.

[0023] Step 5, if the foamed concrete has not been initially set, the mold is moved according to the scale line, and the next scratch test is performed; if the foamed concrete has been initially set, step 6 is performed.

[0024] Step 6, the initial setting rod is removed, the final setting test box is installed, the detachable surface of the mold is removed and placed upwards, the expansion joint is adjusted to reset the height of the supporting assembly, the drawer plate is pulled to make the ping pong ball freely fall, and whether the final setting is reached is judged.

[0025] Advantages: compared with the prior art, the application has the following technical advantages:

[0026] The device and the method are used for testing the setting time of the foamed concrete prepared by the chemical foaming method, and the scientificity and the accuracy are improved.

[0027] (1) in the initial setting time test process, the scratch test of the bread head with a certain slope through the swing arm movement can effectively avoid the phenomenon that the connecting ring is longitudinally penetrated through the foamed concrete by the vicat apparatus, and the scientificity and the comprehensiveness of the test are improved.

[0028] (2) The present invention uses the free fall test method to determine the final setting time, which takes advantage of the lightweight and high elasticity of the ping-pong ball and avoids the phenomenon of damage to the foamed concrete specimen during multiple tests by the Vicat apparatus and connecting ring, and can more effectively test the final setting time. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the device for testing the setting time of foamed concrete prepared by the chemical foaming method according to the present invention.

[0030] Figure 2 This is a schematic diagram illustrating the initial setting time testing status of this invention.

[0031] Figure 3 This is a schematic diagram of the connector of the present invention;

[0032] Figure 4 This is a schematic diagram illustrating the final setting time test status of this invention.

[0033] Figure 5 This is the initial setting rod structure of the present invention;

[0034] Figure 6 This is a schematic diagram of the final condensation test chamber of the present invention;

[0035] In the diagram: 1. Base; 2. Support assembly; 3. Trial mold; 4. Connector; 5. Initial setting rod; 6. Final setting test chamber; 12. Scale line; 22. Limiting arm; 23. Long nose; 41. Through hole; 42. Threaded hole; 61. Test chamber; 62. Ping-pong ball; 63. Draw plate; 24. Longitudinal component; 25. Cantilever component; 241. First pipe fitting; 242. Second pipe fitting; 26. Positioning bolt. Detailed Implementation

[0036] like Figures 1-6 As shown, the present invention discloses a device for detecting the setting time of foamed concrete, comprising a base 1 for placing a test mold 3, the test mold 3 having an opening at the top, wherein at least one side of the mold 3 is a detachable surface for testing the final setting time, and this surface is removed during testing. The device further comprises a support assembly 2, including a longitudinal member 24 and a cantilever member 25, one end of the cantilever member 25 being fixedly connected to the upper end of the longitudinal member 24, and the lower end of the longitudinal member 24 being fixedly connected to the base 1.

[0037] Connector 4 is rotatably connected to the other end of cantilever 25. Connector 4 is provided with threaded hole 42, which is used to connect the initial setting rod 5 or the final setting test box 6. The base 1 is equipped with two parallel clamping strips 11, which are used to limit the test mold 3 on both sides. The test mold 3 is placed between the two clamping strips 11. At least one clamping strip 11 is marked with a scale line 12.

[0038] The longitudinal piece 24 has a telescopic joint for height adjustment, and the upper side of the telescopic joint is provided with a detachable limiting arm 22. The limiting arm 22 is arranged to prevent the initial setting rod 5 from being too large in the line angle of the support assembly 2, and to limit the line of the support assembly 2 to be 45 degrees with the initial setting rod 5.

[0039] The longitudinal piece 24 includes a first pipe 241 arranged above and a second pipe 242 arranged below, the first pipe 241 is sleeved on the upper end of the second pipe 242, and the first pipe 241 is provided with a positioning bolt 26. When the telescopic joint is adjusted to adjust the height of the support assembly 2, the positioning bolt 26 is tightened to realize the relative fixation between the first pipe 241 and the second pipe 242 after the adjustment is completed.

[0040] In the embodiment, one end of the initial setting rod 5 is a smooth rod, and the other end is a threaded end connected with the threaded hole 42 on the connecting piece 4. The initial setting rod 5 has a length of 200 mm, a diameter of 5 mm, and is made of 304 stainless steel with a density of 7.93 g / cm 3 and a Vickers hardness of 220.

[0041] The final setting test box 6 includes a test box body 61, and the lower end of the test box body 61 is provided with a pull-out plate 63, and the pull-out plate 63 is arranged to place a ping-pong ball 62.

[0042] The end of the cantilever piece 25 away from the longitudinal piece 24 is provided with a long nose 23, the connecting piece 4 is provided with a through hole 41 matched with the long nose 23, the inner diameter of the through hole 41 of the connecting piece 4 is consistent with the outer diameter of the long nose 23 of the support assembly, and the connecting piece 4 is matched and installed with the cantilever piece 25. The long nose 23 of the support assembly is coated with a lubricant to be closely connected with the connecting piece 4, so that the initial setting rod 5 can freely swing.

[0043] The application also provides a detection method for the setting time of foam concrete, which is matched with the above device and includes the following steps:

[0044] Step 1, after the foam concrete slurry prepared by the chemical foaming method is finished, the slurry is poured into the test mold 3 to wait for foaming, and the "bread head" is formed after the foaming is finished;

[0045] Step 2, the initial setting rod 5 is installed (connected with the support assembly through the through hole of the connecting head, and then connected with the lubricant coated on the long nose of the support assembly), and the telescopic joint is adjusted to make the bottom end of the initial setting rod tangent to the arc edge of the "bread head";

[0046] Step 3, an external force is applied to make the initial setting rod 5 close to the limiting arm 22;

[0047] Step 4, release the external force to make the initial setting rod 5 do free swing arm movement, judge whether the foam concrete has initial setting by the scratch on the "bread head", when the scratch is not more than the center line of the foam concrete, and the scratch is not more than 50mm, it can be determined that the initial setting has been achieved;

[0048] Step 5, if not initial setting, the test mold 3 can be moved according to the scale line, the moving distance is 10mm, the next scratch test is carried out; if initial setting has been achieved, step 6 is executed;

[0049] Step 6, after the initial setting time test is finished, the initial setting rod 5 is taken off, the final setting test box 6 is replaced, the detachable surface of the test mold 3 is removed and opened, at the same time, the foam concrete test mold 3 is rotated 90° along the direction of the support assembly and placed upward, the expansion joint is adjusted to reset the height of the support assembly, the pull plate is pulled to make the ping pong ball 62 fall freely, when the ping pong ball 62 contacts the foam concrete, it can bounce up 20mm, which proves that the foam concrete has reached the final setting.

Claims

1. A device for detecting the setting time of foamed concrete, comprising: The base (1) for placing the test mold (3) is characterized in that the test mold (3) is open at the top and at least one side is detachable, and the device further comprises: a support assembly (2) comprising a longitudinal member (24) and a cantilever member (25), one end of the cantilever member (25) being fixedly connected to the upper end of the longitudinal member (24), wherein the lower end of the longitudinal member (24) is fixedly connected to the base (1), the longitudinal member (24) has a height adjustment structure on the upper end, the height adjustment structure is a expansion joint, the longitudinal member (24) comprises a first pipe (241) located above and a second pipe (242) located below, the first pipe (241) is sleeved on the upper end of the second pipe (242), and a positioning bolt (26) is arranged on the first pipe (241); a connecting member (4) is rotatably connected to the other end of the cantilever member (25), the connecting member (4) is provided with a threaded hole (42), and the threaded hole is used for connecting a preliminary setting rod (5) or a final setting test box (6); a detachable limiting arm (22) is installed on the longitudinal member (24) on the upper side of the height adjustment structure; the final setting test box (6) comprises a test box body (61), and the test box body (61) is provided with a pull-out plate (63) at the lower end, and a ping-pong ball (62) is placed on the pull-out plate (63); the base (1) is provided with two parallel clamping strips (11) for limiting the test mold (3) on both sides, and at least one clamping strip (11) is marked with a scale line (12). The method for detecting the setting time of foam concrete by using the device comprises the following steps: Step 1: After the foam concrete slurry prepared by the chemical foaming method is stirred, the slurry is poured into the test mold (3) for foaming, and a "bread head" is formed; Step 2: The preliminary setting rod (5) is installed, and the expansion joint is adjusted so that the bottom end of the preliminary setting rod (5) is tangent to the arc edge of the "bread head"; Step 3: An external force is applied to make the preliminary setting rod (5) closely contact the limiting arm (22); Step 4: The external force is released to make the preliminary setting rod (5) do a free pendulum motion, and whether the foam concrete has been preliminarily set is judged by the scratch on the "bread head"; Step 5: If not, the test mold (3) is moved according to the scale line for the next scratch test; if yes, step 6 is performed; Step 6: The preliminary setting rod (5) is removed, the final setting test box (6) is installed, the detachable surface of the test mold (3) is removed and placed upward, the expansion joint is adjusted to reset the height of the support assembly (2), the pull-out plate (63) is pulled to make the ping-pong ball (62) freely fall, and whether the final setting is reached is judged.

2. The apparatus for detecting the setting time of foamed concrete according to claim 1, wherein One end of the preliminary setting rod (5) is a smooth rod, and the other end is a threaded end used for being connected to the threaded hole (42) on the connecting member (4).

3. The apparatus for detecting the setting time of foamed concrete according to claim 2, wherein The end of the cantilever member (25) away from the longitudinal member (24) is provided with a long nose (23), the connecting member (4) is provided with a through hole (41) matched with the long nose (23), and the connecting member (4) is installed in cooperation with the cantilever member (25).

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