Self-compacting concrete pourable state rapid identification device and detection method

Abstract

The invention discloses a self-compacting concrete pourable state rapid distinguishing device and a detection method, and belongs to the field of concrete working performance detection.The self-compacting concrete pourable state rapid distinguishing device comprises a pouring box, a horizontal flow box, a backflow box and an overflow box which are sequentially connected and internally communicated, the perfusion box comprises a transparent first observation plate, the advection box is connected to the lower end of the perfusion box and comprises a transparent second observation plate, the backflow box is connected to the end, away from the perfusion box, of the advection box and comprises a transparent third observation plate, the overflow box is connected to the upper end of the backflow box, and an overflow opening is formed in the upper surface of the overflow box. And the overflow box comprises a transparent fourth observation plate. According to the embodiment of the invention, the pouring state and bubble distribution condition of the self-compacting concrete in the plurality of box bodies can be visually and clearly observed through the transparent observation plate, the pouring performance of the self-compacting concrete is evaluated through the flow velocity ratio and the height difference ratio, the operation is rapid and simple, and the device is convenient and easy to carry.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete work performance detection, and particularly relates to a self-compacting concrete pourable state rapid discrimination device and a detection method. BACKGROUND

[0003] To ensure that the self-compacting concrete has good fluidity, filling property and gap passing property during the track plate pouring process, a self-compacting concrete off-line process test needs to be carried out before formal construction, to verify the matching of the mix proportion, construction process and equipment parameters, so as to ensure that the self-compacting concrete pouring quality is correct before starting formal pouring. In addition, some test methods are still needed on the self-compacting concrete pouring site to ensure the smooth progress of the pouring process. The common test methods, such as the slump spread degree, J ring obstacle height difference test and L type instrument filling ratio test, are used to detect and verify the fluidity, filling property and gap passing property of the self-compacting concrete during the pouring process. The test methods are simple to operate, but need to be tested in sequence, and each test result is single and has contingency. SUMMARY

[0004] The present application aims at at least solving one of the technical problems existing in the prior art. To this end, the present application provides a self-compacting concrete pourable state rapid discrimination device.

[0005] The self-compacting concrete pourable state rapid discrimination device according to the embodiment of the present application comprises: A pouring box arranged along a vertical direction, wherein a first flow channel with an open upper end is arranged in the pouring box, and the pouring box comprises a first observation plate in a transparent state; A horizontal flow box connected to a lower end of the pouring box and arranged along a horizontal direction, wherein a second flow channel communicating with the first flow channel is arranged in the horizontal flow box, and the horizontal flow box comprises a second observation plate in a transparent state; A backflow box arranged along a vertical direction and connected to an end of the horizontal flow box away from the pouring box, wherein a third flow channel communicating with the second flow channel is arranged in the backflow box, and the backflow box comprises a third observation plate in a transparent state; An overflow box arranged along a horizontal direction, wherein the overflow box is connected to an upper end of the backflow box, a fourth flow channel communicating with the third flow channel is arranged in the overflow box, and an overflow port communicating with the fourth flow channel is arranged on an end of an upper surface of the overflow box away from the backflow box, and the overflow box comprises a fourth observation plate in a transparent state.

[0006] The self-compacting concrete pourable state rapid discrimination device according to the embodiment of the present application has at least the following beneficial effects: The self-compacting concrete is injected along the open end of the first flow channel, and then flows to the second flow channel, the third flow channel and the fourth flow channel in turn, and finally overflows along the overflow port. The multi-section connected box is used to simulate the flow state and surface bubble distribution of the self-compacting concrete in the track plate pouring process. The pouring state and bubble distribution of the self-compacting concrete in the pouring box (the surface bubble / hole distribution after the self-compacting concrete hardens) can be directly and clearly observed through the transparent first observation plate. The pouring state and bubble distribution of the self-compacting concrete in the horizontal flow box can be directly and clearly observed through the transparent second observation plate. The pouring state and bubble distribution of the self-compacting concrete in the backflow box can be directly and clearly observed through the transparent third observation plate. The pouring state and bubble distribution of the self-compacting concrete in the overflow box can be directly and clearly observed through the transparent fourth observation plate. The pourable performance of the self-compacting concrete is evaluated through the flow velocity ratio and the height difference ratio. The operation is quick and simple, and the device is easy to carry, thereby providing a reference for the filling layer self-compacting concrete pouring construction.

[0007] According to some embodiments of the present application, the first observation plate is arranged on the pouring box near the backflow box side, the second observation plate is arranged on the upper surface of the horizontal flow box, the third observation plate is arranged on the backflow box near the pouring box side, and the fourth observation plate is arranged on the upper surface of the overflow box.

[0008] According to some embodiments of the present application, the height of the pouring box is greater than the height of the backflow box, and the upper end of the pouring box is located above the upper surface of the overflow box.

[0009] According to some embodiments of the present application, the self-compacting concrete pourable state rapid identification device further comprises a feeding hopper, the feeding hopper is detachably connected to the upper end of the pouring box, the feeding hopper is provided with a feeding channel with two open ends and connected to the first flow channel, and the upper end of the feeding channel has a larger cross-sectional area than the lower end of the feeding channel.

[0010] According to some embodiments of the present application, the pouring box further comprises a pouring bottom plate and two pouring side plates, the two pouring side plates are respectively connected to the two ends of the pouring bottom plate along the width direction of the pouring bottom plate, the first observation plate is detachably connected to the two pouring side plates, and the pouring bottom plate, the two pouring side plates and the first observation plate form the first flow channel.

[0011] According to some embodiments of the present application, one end of the pouring side plate near the first observation plate is provided with an extension plate which protrudes away from the other pouring side plate, and the extension plate and the first observation plate are connected by bolts and / or buckles.

[0012] According to some embodiments of the present application, the buckle comprises a clamping block, a screw rod, a pad plate and a lever, the clamping block is provided with a clamping groove for the epitaxial plate and the first observation plate to extend into, the clamping block is provided with a threaded hole penetrating the inner wall of the clamping groove, the screw rod is threadedly connected with the threaded hole, the pad plate abuts one end of the screw rod extending into the clamping groove, and the screw rod is provided with a connecting hole for the lever to extend into at the other end away from the clamping block.

[0013] According to some embodiments of the present application, the horizontal flow box further comprises a horizontal flow bottom plate and two horizontal flow side plates, the two horizontal flow side plates are respectively connected to two ends of the horizontal flow bottom plate along the width direction of the horizontal flow bottom plate, the second observation plate is detachably connected with the two horizontal flow side plates, and the horizontal flow bottom plate, the two horizontal flow side plates and the second observation plate jointly enclose the second flow channel.

[0014] According to some embodiments of the present application, the return flow box further comprises a return flow bottom plate and two return flow side plates, the two return flow side plates are respectively connected to two ends of the return flow bottom plate along the width direction of the return flow bottom plate, the third observation plate is detachably connected with the two return flow side plates, and the return flow bottom plate, the two return flow side plates and the third observation plate jointly enclose the third flow channel.

[0015] According to some embodiments of the present application, the overflow box further comprises an overflow bottom plate, an overflow baffle and two overflow side plates, the two overflow side plates are respectively connected to two ends of the overflow bottom plate along the width direction of the overflow bottom plate, the fourth observation plate is detachably connected with the two overflow side plates, the overflow baffle is connected to the overflow bottom plate and the two overflow side plates, the overflow baffle is spaced apart from the fourth observation plate, and the overflow bottom plate, the overflow baffle, the two overflow side plates and the fourth observation plate jointly enclose the fourth flow channel.

[0016] A method for detecting the pourable state of self-compacting concrete according to an embodiment of the present application comprises the following steps: S1, preparing a self-compacting concrete pourable state rapid identification device to ensure that the device is placed horizontally; S2, pasting air-permeable geotextile on the inside of the device to facilitate the restoration of the self-compacting concrete flow condition in the actual construction process and the removal of the concrete test piece later; S3, installing a first observation plate, a second observation plate, a third observation plate and a fourth observation plate, and fixing them using bolts or buckles; S4, the mixed self-compacting concrete is loaded into a barrel with a volume of 15L, is slowly added through a feeding hopper and timing is started, and whether there are bubbles on the bottom surface of the observation surface during the self-compacting concrete pouring process and whether the concrete after overflow is homogeneous is observed, and the times t1, t2 and t3 when the self-compacting concrete reaches the backflow bottom plate, the top end of the backflow tank and the overflow tank baffle are recorded respectively, and the height h of the concrete in the pouring tank when the self-compacting concrete no longer overflows is recorded, and it should be noted that the edges of the mixture at the moments t1 and t2 contact the backflow tank bottom plate or the overflow tank baffle; S5, the flow rate ratio is calculated by using formula (1) υ , which represents the change of the flow rate of the self-compacting concrete after overcoming the gravity, and the greater the flow rate ratio, the stronger the ability of the self-compacting concrete to overcome the gravity.

[0017] (1) In the formula, υ is the flow rate ratio; t1 is the time when the self-compacting concrete contacts the backflow bottom plate from the beginning of pouring, in seconds; t2 is the time when the self-compacting concrete contacts the top end of the backflow tank from the beginning of pouring, in seconds; t 3 is the time when the self-compacting concrete contacts the overflow tank baffle from the beginning of pouring, in seconds; d1 is the length of the horizontal flow tank, in millimeters, and is preferably 450 mm in the application; d2 is the length of the overflow tank, in millimeters, and is preferably 225 mm in the application; S6, the height difference ratio is calculated by using formula (2) δ , which represents the change of the filling height of the self-compacting concrete after overcoming the gravity, and the smaller the height difference, the better the pourability of the self-compacting concrete.

[0018] (2) In the formula, δ is the height difference ratio; h is the distance from the surface of the self-compacting concrete in the pouring tank to the top end of the tank after reaching stability, in millimeters; h1 is the height of the pouring tank of the device, in millimeters, and is preferably 400 mm in the application; h2 is the height of the combination of the horizontal flow tank and the backflow tank, in millimeters, and is preferably 175 mm in the application; S7, after standing in a laboratory with an environmental temperature of 20℃ and a humidity of more than 50% for 6 hours, the first observation plate, the second observation plate, the third observation plate and the fourth observation plate on the surface are removed, and the area and the number of the holes on the surface are counted.

[0019] According to the self-compacting concrete pourability state detection method provided in the embodiments of the application, at least the following beneficial effects are achieved: The self-compacting concrete is injected along the open end of the first flow channel, and then flows to the second flow channel, the third flow channel and the fourth flow channel in turn, and finally overflows along the overflow port. The multi-section connected box is used to simulate the flowing state and surface bubble distribution of the self-compacting concrete in the track plate pouring process. The pouring state and bubble distribution of the self-compacting concrete in the pouring box (the surface bubble / hole distribution of the hardened self-compacting concrete) can be directly and clearly observed through the transparent first observation plate. The pouring state and bubble distribution of the self-compacting concrete in the horizontal flow box can be directly and clearly observed through the transparent second observation plate. The pouring state and bubble distribution of the self-compacting concrete in the backflow box can be directly and clearly observed through the transparent third observation plate. The pouring state and bubble distribution of the self-compacting concrete in the overflow box can be directly and clearly observed through the transparent fourth observation plate. The pourable performance of the self-compacting concrete is evaluated by the flow velocity ratio and the height difference ratio. The operation is quick and simple, and the device is easy to carry, thereby providing a reference for the filling layer self-compacting concrete pouring construction.

[0020] Additional aspects and advantages of the present application will be described in the following description. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described below in conjunction with the drawings and examples, in which: Figure 1 A structure schematic view of the self-compacting concrete pourable state quick discrimination device of the embodiment of the present application; Figure 2 A structure schematic view of the self-compacting concrete pourable state quick discrimination device of the embodiment of the present application without the feeding hopper; Figure 3 A structure schematic view of the self-compacting concrete pourable state quick discrimination device of the embodiment of the present application without the feeding hopper, the first observation plate, the second observation plate, the third observation plate and the fourth observation plate; Figure 4 A structure schematic view of the buckle of the self-compacting concrete pourable state quick discrimination device of the embodiment of the present application.

[0022] Reference signs: 100, pouring box; 110, first observation plate; 120, pouring bottom plate; 130, pouring side plate; 131, outer extension plate; 200, horizontal flow box; 210, second observation plate; 220, horizontal flow bottom plate; 230, horizontal flow side plate; 300, backflow box; 310, third observation plate; 320, backflow bottom plate; 330, backflow side plate; 400, overflow box; 410, fourth observation plate; 420, overflow port; 430, overflow bottom plate; 440, overflow baffle; 450, overflow side plate; 500, feeding hopper; 600, buckle; 610, clamping block; 611, clamping groove; 620, screw rod; 630, pad plate; 640, push rod. DETAILED DESCRIPTION

[0023] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are for the purpose of explaining the present application only, and should not be understood as limiting the present application.

[0024] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application. In addition, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0025] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] Please refer to Figure 1 , Figure 2 and Figure 3The self-compacting concrete pourable state rapid distinguishing device provided by the embodiment of the application comprises a pouring box 100, a horizontal flow box 200, a backflow box 300 and an overflow box 400. The pouring box 100 is arranged along a vertical direction. The pouring box 100 is provided with a first flow channel with an open upper end. The pouring box 100 comprises a first observation plate 110 in a transparent state. The horizontal flow box 200 is arranged along a horizontal direction and is connected to the lower end of the pouring box 100. The horizontal flow box 200 is provided with a second flow channel communicating with the first flow channel. The horizontal flow box 200 comprises a second observation plate 210 in a transparent state. The backflow box 300 is arranged along a vertical direction and is connected to the end of the horizontal flow box 200 away from the pouring box 100. The backflow box 300 is provided with a third flow channel communicating with the second flow channel. The backflow box 300 comprises a third observation plate 310 in a transparent state. The overflow box 400 is arranged along a horizontal direction. The overflow box 400 is connected to the upper end of the backflow box 300. The overflow box 400 is provided with a fourth flow channel communicating with the third flow channel. The upper end of the overflow box 400 away from the backflow box 300 is provided with an overflow port 420 communicating with the fourth flow channel. The overflow box 400 comprises a fourth observation plate 410 in a transparent state.

[0027] The self-compacting concrete is poured along the open end of the first flow channel, and then flows to the second flow channel, the third flow channel and the fourth flow channel in sequence, and finally overflows along the overflow port 420. The multi-section communicating box is used to simulate the flow state and surface bubble distribution of the self-compacting concrete in the track plate pouring process. The pouring state and bubble distribution of the self-compacting concrete in the pouring box 100 (the surface bubble / hole distribution of the hardened self-compacting concrete) can be directly and clearly observed through the transparent first observation plate 110. The pouring state of the self-compacting concrete in the horizontal flow box 200 can be directly and clearly observed through the transparent second observation plate 210. The pouring state and bubble distribution of the self-compacting concrete in the backflow box 300 can be directly and clearly observed through the transparent third observation plate 310. The pouring state and bubble distribution of the self-compacting concrete in the overflow box 400 can be directly and clearly observed through the transparent fourth observation plate 410. The flow performance of the self-compacting concrete is evaluated by counting the overflow time of the self-compacting concrete from the overflow port 420. The operation is rapid and simple, and the device is easy to carry, thereby providing a reference for the filling layer self-compacting concrete pouring construction.

[0028] In some embodiments, reference is made to Figure 1 , Figure 2 and Figure 3The first observation plate 110 is arranged on the perfusion box 100 near the side of the backflow box 300, the second observation plate 210 is arranged on the upper surface of the horizontal flow box 200, the third observation plate 310 is arranged on the side of the backflow box 300 near the perfusion box 100, and the fourth observation plate 410 is arranged on the upper surface of the overflow box 400. The first observation plate 110, the second observation plate 210, the third observation plate 310 and the fourth observation plate 410 are sequentially connected, and the first observation plate 110, the second observation plate 210 and the third observation plate 310 are located on the inner side of the self-compacting concrete perfusion state rapid identification device, so that the test personnel can conveniently observe and record from above.

[0029] In some embodiments, referring to Figure 1 、 Figure 2 and Figure 3 , the height of the perfusion box 100 is greater than the height of the backflow box 300, and the upper end of the perfusion box 100 is located above the upper surface of the overflow box 400. The perfusion box 100, the horizontal flow box 200 and the backflow box 300 are arranged in a U-shaped layout, which is suitable for the principle of communicating vessels. The height of the perfusion box 100 is higher than the height of the backflow box 300, which facilitates the adjustment of the liquid level of the concrete in the perfusion box 100. When the liquid level of the concrete in the perfusion box 100 is higher than the top of the backflow box 300, the concrete can flow smoothly into the overflow box 400 through the backflow box 300, and overflow from the overflow port 420.

[0030] In some embodiments, referring to Figure 1 、 Figure 2 and Figure 3 , the self-compacting concrete perfusion state rapid identification device further comprises a feeding hopper 500, which is detachably connected to the upper end of the perfusion box 100. The feeding hopper 500 is provided with a feeding channel, the two ends of the feeding channel are open and communicate with the first flow channel, and the cross-sectional area of the upper end of the feeding channel is greater than that of the lower end. The feeding hopper 500 is arranged above the perfusion box 100, and the upper end of the feeding hopper 500 is larger than the lower end, which facilitates the injection of self-compacting concrete into the perfusion box 100 through the feeding hopper 500.

[0031] In some embodiments, referring to Figure 1 、 Figure 2 and Figure 3The perfusion box 100 further comprises a perfusion bottom plate 120 and two perfusion side plates 130 connected at two ends of the perfusion bottom plate 120 along the width direction of the perfusion bottom plate 120. The first observation plate 110 is detachably connected with the two perfusion side plates 130, and the perfusion bottom plate 120, the two perfusion side plates 130 and the first observation plate 110 form a first flow channel. The perfusion bottom plate 120 and the perfusion side plates 130 are made of 3mm-thick stainless steel, and the perfusion bottom plate 120 and the two perfusion side plates 130 are welded together, which is solid and durable and convenient for repeated use. The first observation plate 110 is made of 5mm-thick acrylic plate, and the first observation plate 110 is detachably connected with the two perfusion side plates 130, which is convenient for disassembly and assembly and convenient for taking out the solidified concrete from the perfusion box 100. The internal space size of the perfusion box 100 is 160mm x 75mm x 400mm in length, width and height, and the size of the first observation plate 110 is 180mm x 5mm x 400mm.

[0032] In some embodiments, referring to Figure 1 , Figure 2 and Figure 4 , the perfusion side plate 130 is provided with an extension plate 131 protruding away from the other perfusion side plate 130 at one end close to the first observation plate 110. The extension plate 131 is connected with the first observation plate 110 by bolts, and the extension plate 131 and the first observation plate 110 can also be connected by a buckle 600, and the extension plate 131 and the first observation plate 110 can also be connected by a combination of bolts and the buckle 600. The extension plate 131 is protruding outside the perfusion box 100, which is convenient for connecting with the first observation plate 110 and does not affect the flow of concrete in the perfusion box 100, so that the first observation plate 110 is convenient for disassembly and assembly.

[0033] In some embodiments, referring to Figure 1 , Figure 2 and Figure 4The buckle 600 comprises a clamping block 610, a screw rod 620, a backing plate 630 and a lever 640. The clamping block 610 is provided with a clamping groove 611, and the epitaxial plate 131 and the first observation plate 110 extend into the clamping groove 611. The clamping block 610 is provided with a threaded hole penetrating the inner wall of the clamping groove 611, the screw rod 620 is threadedly connected with the threaded hole, and the backing plate 630 abuts against one end of the screw rod 620 extending into the clamping groove 611. The backing plate 630 can avoid the screw rod 620 directly abutting against the epitaxial plate 131, increase the contact area, and ensure uniform stress. The end of the screw rod 620 away from the clamping block 610 is provided with a connecting hole, and the lever 640 extends into the connecting hole. During installation, the epitaxial plate 131 and the first observation plate 110 extend into the clamping groove 611, the backing plate 630 is located in the clamping groove 611, the epitaxial plate 131 and the first observation plate 110 are clamped by the backing plate 630 and one side wall of the clamping groove 611, the lever 640 is actuated, the screw rod 620 is driven to rotate, the length of the screw rod 620 extending into the clamping groove 611 is adjusted, and the epitaxial plate 131 and the first observation plate 110 are clamped.

[0034] In some embodiments, referring to Figure 1 , Figure 2 and Figure 3 , the homogenizing box 200 further comprises a homogenizing bottom plate 220 and two homogenizing side plates 230, and the two homogenizing side plates 230 are respectively connected to two ends of the homogenizing bottom plate 220 along the width direction of the homogenizing bottom plate 220. The second observation plate 210 is detachably connected with the two homogenizing side plates 230, and the homogenizing bottom plate 220, the two homogenizing side plates 230 and the second observation plate 210 jointly form a second flow channel. The homogenizing bottom plate 220 and the homogenizing side plates 230 are made of 3mm-thick stainless steel, and the homogenizing bottom plate 220 and the two homogenizing side plates 230 are welded together, which is solid and durable and facilitates repeated use. The second observation plate 210 is made of a 5mm-thick acrylic plate, and the second observation plate 210 is detachably connected with the two homogenizing side plates 230, which facilitates disassembly and assembly and facilitates taking out the solidified concrete from the homogenizing box 200. The internal space size of the homogenizing box 200 is 450mm×160mm×75mm in length, width and height, and the size of the acrylic plate (22) is 180mm×5mm×290mm.

[0035] The homogenizing side plate 230 is also provided with the epitaxial plate 131, and the epitaxial plate 131 is detachably connected with the second observation plate 210 through bolts or the buckle 600.

[0036] In some embodiments, referring to Figure 1 , Figure 2 and Figure 3The backflow box 300 further comprises a backflow bottom plate 320 and two backflow side plates 330, the two backflow side plates 330 are respectively connected at two ends of the backflow bottom plate 320 along the width direction of the backflow bottom plate 320, the third observation plate 310 is detachably connected with the two backflow side plates 330, and the backflow bottom plate 320, the two backflow side plates 330 and the third observation plate 310 jointly form a third flow channel. The backflow bottom plate 320 and the backflow side plate 330 are made of 3mm-thick stainless steel, the backflow bottom plate 320 and the two backflow side plates 330 are welded together, which is solid and durable and facilitates repeated use. The third observation plate 310 is made of 5mm-thick acrylic plate, the third observation plate 310 is detachably connected with the two backflow side plates 330, which facilitates disassembly and assembly and facilitates taking out the solidified concrete from the backflow box 300. The internal space size of the backflow box 300 is 160mm*75mm*100mm in length, width and height respectively, and the size of the third observation plate 310 is 180mm*5mm*175mm.

[0037] The backflow side plate 330 is also provided with an extension plate 131, and the extension plate 131 is detachably connected with the second observation plate 210 through bolts or buckling members 600.

[0038] In some embodiments, referring to Figure 1 , Figure 2 and Figure 3 , the overflow box 400 further comprises an overflow bottom plate 430, an overflow baffle 440 and two overflow side plates 450, the two overflow side plates 450 are respectively connected at two ends of the overflow bottom plate 430 along the width direction of the overflow bottom plate 430, the fourth observation plate 410 is detachably connected with the two overflow side plates 450, the overflow baffle 440 is connected with the overflow bottom plate 430 and the two overflow side plates 450, the overflow baffle 440 is spaced apart from the fourth observation plate 410, and the overflow bottom plate 430, the overflow baffle 440, the two overflow side plates 450 and the fourth observation plate 410 jointly form a fourth flow channel. The overflow bottom plate 430, the overflow baffle 440 and the overflow side plate 450 are made of 3mm-thick stainless steel, the overflow bottom plate 430, the overflow baffle 440 and the two overflow side plates 450 are welded together, which is solid and durable and facilitates repeated use. The fourth observation plate 410 is made of 5mm-thick acrylic plate, the fourth observation plate 410 is detachably connected with the two overflow side plates 450, which facilitates disassembly and assembly and facilitates taking out the solidified concrete from the overflow box 400. The internal space size of the overflow box 400 is 225mm*160mm*75mm in length, width and height respectively, and the size of the fourth observation plate 410 is 180mm*5mm*175mm in length, width and height respectively.

[0039] The overflow side plate 450 is also provided with an extension plate 131, and the extension plate 131 is detachably connected with the second observation plate 210 through bolts or buckling members 600.

[0040] The self-compacting concrete pourable state detection method according to the embodiment of the present application comprises the following steps: S1, prepare a self-compacting concrete pourable state rapid identification device, and ensure that the device is placed horizontally.

[0041] S2, paste air-permeable geotextile on the inside of the device, so as to restore the flow state of the self-compacting concrete in the actual construction process and the removal of the concrete test piece later.

[0042] S3, install the first observation plate 110, the second observation plate 210, the third observation plate 310 and the fourth observation plate 410, and fix them by using bolts or buckles 600.

[0043] S4, fill the self-compacting concrete after mixing into a barrel with a volume of 15L, slowly add it through the feeding hopper 500 and start timing, observe whether there are air bubbles on the bottom surface of the observation surface during the pouring of the self-compacting concrete and whether the concrete after overflow is homogeneous, record the times t1, t2 and t3 when the self-compacting concrete reaches the backflow bottom plate, the top end of the backflow box and the overflow box baffle respectively, and record the height h of the concrete in the pouring box when the self-compacting concrete no longer overflows, it should be noted that the edges of the mixture at t1 and t2 correspond to the backflow box bottom plate or the overflow box baffle; S5, calculate the flow rate ratio using formula (1) υ , which represents the change of the flow rate of the self-compacting concrete after overcoming the self-weight, and the greater the flow rate ratio, the stronger the ability of the self-compacting concrete to overcome the self-weight.

[0044] (1) In the formula, υ is the flow rate ratio; t1 is the time for the self-compacting concrete to contact the backflow bottom plate from the start of pouring, in seconds; t2 is the time for the self-compacting concrete to reach the top end of the backflow box from the start of pouring, in seconds; t 3 is the time for the self-compacting concrete to contact the overflow box baffle from the start of pouring, in seconds; d1 is the length of the horizontal flow box, in millimeters, and is preferably 450mm in the present application; d2 is the length of the overflow box, in millimeters, and is preferably 225mm in the present application.

[0045] S6, calculate the height difference ratio using formula (2) δ , which represents the change of the filling height of the self-compacting concrete after overcoming the self-weight, and the smaller the height difference, the better the pourability of the self-compacting concrete.

[0046] (2) In the formula, δis the height difference ratio; h is the distance from the surface of the self-compacting concrete in the pouring box to the top of the box after reaching stability, in mm; h1 is the height of the pouring box of the device, in mm, and is preferably 400 mm in the present application; h2 is the height of the combination of the horizontal flow box and the backflow box, in mm, and is preferably 175 mm in the present application.

[0047] S7 After standing in the laboratory at an ambient temperature of 20℃ and a humidity of more than 50% for 6h, the first observation plate 110, the second observation plate 210, the third observation plate 310 and the fourth observation plate 410 on the surface are removed, and the area and number of the holes on the surface are counted.

[0048] The three kinds of self-compacting concrete are detected respectively using the self-compacting concrete pourable state rapid identification device and the self-compacting concrete pourable state detection method, and the detection results are shown in the following table.

[0049] As shown in the above table, the self-compacting concrete of Example 1 has relatively stronger ability to overcome gravity, and the self-compacting concrete of Example 1 has relatively better pourability.

[0050] The self-compacting concrete is poured along the open end of the first flow channel, and then flows to the second flow channel, the third flow channel and the fourth flow channel in turn, and finally overflows along the overflow port 420. A multi-section connected box body is used to simulate the flow state and surface bubble distribution of the self-compacting concrete in the process of pouring on the track slab. The pouring state and bubble distribution of the self-compacting concrete in the pouring box 100 (the surface bubble / hole distribution after the self-compacting concrete hardens) can be observed directly and clearly through the transparent first observation plate 110. The pouring state of the self-compacting concrete in the horizontal flow box 200 can be observed directly and clearly through the transparent second observation plate 210. The pourable performance of the self-compacting concrete is evaluated by the flow rate ratio and the height difference ratio. The pouring state and bubble distribution of the self-compacting concrete in the backflow box 300 can be observed directly and clearly through the transparent third observation plate 310. The pouring state and bubble distribution of the self-compacting concrete in the overflow box 400 can be observed directly and clearly through the transparent fourth observation plate 410. The flow performance of the self-compacting concrete is evaluated by counting the overflow time of the self-compacting concrete from the overflow port 420. The operation is fast and simple, and is easy to carry, and provides a reference for the filling layer self-compacting concrete pouring construction.

[0051] In the description of the specification, reference to "one embodiment", "some embodiments", "an exemplary embodiment", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "in some embodiments", "in an exemplary embodiment", "an example", "a specific example", or "some examples" in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0052] Although embodiments of the application have been shown and described, it will be appreciated that those skilled in the art can make various changes, modifications, substitutions and alterations thereto without departing from the spirit and scope of the application, which should be limited only by the appended claims and their equivalents.

Claims

1. A device for rapidly identifying the pourable state of self-compacting concrete, characterized in that, include; A filling box is arranged vertically, and a first flow channel with an open upper end is provided inside the filling box. The filling box includes a first observation plate that is transparent. A horizontally arranged flow box is connected to the lower end of the injection box. The flow box contains a second flow channel that communicates with the first flow channel. The flow box also includes a transparent second observation plate. A reflux box is arranged vertically and connected to the end of the horizontal flow box away from the injection box. The reflux box is provided with a third flow channel that communicates with the second flow channel. The reflux box includes a transparent third observation plate. An overflow box is arranged horizontally and connected to the upper end of the return box. A fourth flow channel communicating with the third flow channel is provided inside the overflow box. An overflow port communicating with the fourth flow channel is provided at the end of the upper surface of the overflow box away from the return box. The overflow box includes a transparent fourth observation plate.

2. The device for rapid identification of the pourable state of self-compacting concrete according to claim 1, characterized in that, The first observation plate is located on the side of the filling tank near the reflux tank, the second observation plate is located on the upper surface of the horizontal flow tank, the third observation plate is located on the side of the reflux tank near the filling tank, and the fourth observation plate is located on the upper surface of the overflow tank.

3. The device for rapid identification of the pourable state of self-compacting concrete according to claim 1, characterized in that, The height of the filling tank is greater than the height of the reflux tank, and the upper end of the filling tank is located above the upper surface of the overflow tank.

4. The device for rapid identification of the pourable state of self-compacting concrete according to claim 1, characterized in that, It also includes a feeding hopper, which is detachably connected to the upper end of the filling box. The feeding hopper is provided with a feeding channel with both ends open and connected to the first flow channel. The upper cross-sectional area of ​​the feeding channel is larger than the lower cross-sectional area of ​​the feeding channel.

5. The device for rapid identification of the pourable state of self-compacting concrete according to claim 1, characterized in that, The injection box also includes an injection base plate and two injection side plates. The two injection side plates are respectively connected to both ends of the injection base plate along the width direction of the injection base plate. The first observation plate is detachably connected to the two injection side plates. The injection base plate, the two injection side plates and the first observation plate together form the first flow channel.

6. The device for rapid identification of the pourable state of self-compacting concrete according to claim 5, characterized in that, An extension plate is provided on one end of the infusion side plate near the first observation plate, protruding in a direction away from the other infusion side plate. The extension plate is connected to the first observation plate by bolts and / or fasteners.

7. The device for rapid identification of the pourable state of self-compacting concrete according to claim 6, characterized in that, The fastener includes a clamping block, a screw, a pad, and a lever. The clamping block has a clamping groove for the extension plate and the first observation plate to extend into. The clamping block has a threaded hole that penetrates the inner wall of the clamping groove. The screw is threadedly connected to the threaded hole. The pad abuts against the end of the screw that extends into the clamping groove. The end of the screw away from the clamping block has a connecting hole for the lever to extend into.

8. The device for rapid identification of the pourable state of self-compacting concrete according to claim 1, characterized in that, The advection box also includes an advection bottom plate and two advection side plates. The two advection side plates are respectively connected to both ends of the advection bottom plate along the width direction of the advection bottom plate. The second observation plate is detachably connected to the two advection side plates. The advection bottom plate, the two advection side plates and the second observation plate together form the second flow channel. The reflux box also includes a reflux bottom plate and two reflux side plates. The two reflux side plates are respectively connected to both ends of the reflux bottom plate along the width direction of the reflux bottom plate. The third observation plate is detachably connected to the two reflux side plates. The reflux bottom plate, the two reflux side plates and the third observation plate together form the third flow channel.

9. The device for rapid identification of the pourable state of self-compacting concrete according to claim 1, characterized in that, The overflow box further includes an overflow base plate, an overflow baffle, and two overflow side plates. The two overflow side plates are respectively connected to both ends of the overflow base plate along the width direction of the overflow base plate. The fourth observation plate is detachably connected to the two overflow side plates. The overflow baffle connects the overflow base plate and the two overflow side plates. The overflow baffle and the fourth observation plate are spaced apart. The overflow base plate, the overflow baffle, the two overflow side plates, and the fourth observation plate together form the fourth flow channel.

10. A method for detecting the pourability state of self-compacting concrete, using the rapid identification device for the pourability state of self-compacting concrete as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Prepare to manufacture a rapid identification device for the pourable state of self-compacting concrete. S2. Adhere breathable geotextile to the inside of the device; S3. Install the first observation plate, the second observation plate, the third observation plate and the fourth observation plate, and fix them with bolts or fasteners; S4. Load the well-mixed self-compacting concrete into a bucket, slowly add it through the feed hopper and start timing. Record the time t1 when the self-compacting concrete reaches the bottom plate of the return flow, the time t2 when the self-compacting concrete reaches the top of the return flow box, the time t3 when the self-compacting concrete reaches the baffle of the overflow box, and the height h of the concrete in the pouring box when the self-compacting concrete no longer overflows. S5, Calculate the flow rate ratio υ : ， In the formula, υ Here, t1 represents the flow rate ratio, t2 represents the time from the start of pouring the self-compacting concrete to its contact with the return slab, and t2 represents the time from the start of pouring the self-compacting concrete to the top of the return slab. t 3 represents the time from the start of pouring the self-compacting concrete to contact the overflow box baffle, d1 represents the length of the horizontal flow box, and d2 represents the length of the overflow box. S6. Calculate the height difference ratio δ : ， In the formula, δ h is the height difference ratio, h is the distance from the surface of the self-compacted concrete inside the grouting box to the top of the box after it has reached stability, h1 is the height of the grouting box of the device, and h2 is the height of the combination of the horizontal flow box and the return flow box of the device. S7. After standing in a laboratory with an ambient temperature of 20℃ and humidity of over 50% for 6 hours, remove the first, second, third, and fourth observation plates on the surface and count the area and number of holes on the surface.

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