CN212903672U - Yield stress and plastic viscosity detection device for fresh concrete - Google Patents
Yield stress and plastic viscosity detection device for fresh concrete Download PDFInfo
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- CN212903672U CN212903672U CN202021689963.4U CN202021689963U CN212903672U CN 212903672 U CN212903672 U CN 212903672U CN 202021689963 U CN202021689963 U CN 202021689963U CN 212903672 U CN212903672 U CN 212903672U
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Abstract
The utility model provides a newly mix concrete with yield stress and plasticity viscosity detection device. The device comprises a conical funnel, an L-shaped box, a manual gate, a first bar-shaped level bubble, a second bar-shaped level bubble, an experiment flat plate and trundle adjusting blocks, wherein the L-shaped box consists of a top surface protruding from one side of the upper part and a chute arranged at the lower part; the inner wall of the conical funnel is provided with a rib with a circular section, and the rib is fixed on the inner wall of the conical funnel in a continuous spiral downward shape. The utility model discloses the device is simple, and the method is easily operated, has accuracy and practicality.
Description
Technical Field
The utility model relates to a fresh concrete working property detection technique, concretely relates to fresh concrete is with yield stress and plastic viscosity detection device.
Background
Along with the gradual increase of the height and the difficulty of construction projects, the requirements of concrete engineering on the working performance of concrete are higher and higher, the high fluidity is reflected, and the stability of the working performance of the concrete and the matching performance of the working performance of the concrete and the project requirements are reflected. The concrete is used as a fluid, and the characteristics of the concrete are mainly characterized by two indexes of yield stress and plastic viscosity, wherein the former determines how far the concrete can flow, and the latter determines the flow speed. However, the most extensive testing means of the working performance of the concrete at present is a slump test, the index is too single, and the working performance of the concrete cannot be measured from two dimensions of yield stress and plastic viscosity. The rheometer can accurately and quantitatively represent the working performance of concrete according to two indexes of yield stress and plastic viscosity, but the rheometer is expensive, has high detection environment requirements, and cannot be used frequently in large-range and high frequency in a concrete delivery detection and construction field, so that a device and a method which are simple in operation and can accurately represent the relative sizes of the yield stress and the plastic viscosity of the concrete are required to be developed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a freshly mixed concrete is with yield stress and plastic viscosity detection device, concrete working property detection index is single in solving present engineering, can't follow the difficult problem that two dimensions of yield stress and plastic viscosity are measured, through the yield stress and the high correlation of the high correlation between the length of flow and plastic viscosity and evacuation time, through the yield stress and the plastic viscosity of record flow length and evacuation time with the freshly mixed concrete of sign to more accurate description freshly mixed concrete working property. The utility model discloses the device is simple, easily operation, has practicality and accuracy.
The utility model provides a pair of newly mix concrete with yield stress and plastic viscosity detection device, wherein:
the device comprises a conical funnel, an L-shaped box, a manual gate, a first bar-shaped level bubble, a second bar-shaped level bubble, an experiment flat plate and trundle adjusting blocks, wherein the L-shaped box consists of a top surface protruding from one side of the upper part and a chute arranged at the lower part; the inner wall of the conical funnel is provided with a rib with a circular section, and the rib is fixed on the inner wall of the conical funnel in a continuous spiral downward shape; the first bar-shaped level bubble and the second bar-shaped level bubble are both parallel to the bottom surface of the L-shaped box.
In the utility model, the inner diameter of the upper opening of the conical funnel is 15 cm-20 cm, the lower opening is 8-9 mm, and the height is 35 cm-40 cm; the bottom of the conical funnel, namely the lower opening, is connected with a manual gate, and the diameter of the section of each rib is 2 mm-5 mm.
In the utility model, the width of the L-shaped box is 15 cm-20 cm, the length is 100 cm-130 cm, the height of the lower chute part is 15 cm-20 cm, no sealing cover is provided, the horizontal plane of the short side surface is 8 cm-10 cm higher than that of the long side surface, the top surface of the short side surface of the L-shaped box is provided with a circular opening, and the size of the opening is consistent with the lower opening of the conical funnel; two long side surfaces of the L-shaped box are made of transparent rigid PVC plates, the thickness of the L-shaped box is larger than or equal to 10mm, the bottom of the outer side of the long side surface of the L-shaped box is provided with scales along the length direction, and the minimum division value is 1 mm.
The utility model discloses in, manual gate adopts stainless steel, comprises the semicircle concatenation rectangular form handle of two shape symmetries, and is articulated by a pin joint, opens and shuts through the handle, and the biggest angle that opens and shuts is 180, sets up in conical hopper bottom position to be linked together with L shape case bulge's top surface round hole.
The utility model discloses in, the experiment is dull and stereotyped for rigidity light aluminum alloy material is dull and stereotyped, and thickness is 2~3 cm.
The utility model provides a measuring method of yield stress and plastic viscosity measuring device for fresh concrete, concrete step is as follows:
(1) placing the device on a horizontal solid plane;
(2) leveling and measuring devices are arranged through caster adjusting blocks and bar-shaped level bubbles;
(3) checking that the manual gate is in a closed state, filling fresh concrete into the conical funnel twice, and standing for 5-10 s;
(4) rapidly opening a manual gate, and simultaneously recording the emptying time T of fresh concrete in the conical funnel, wherein T is a specific numerical value and is in the unit of s;
(5) and after the fresh concrete flows to a stop in the L-shaped box, reading the flowing distance L of the fresh concrete through the scales on the transparent side edges, wherein L is a specific numerical value and is accurate to 0.5cm, and the unit is cm.
The utility model discloses in, when dividing twice to fill conical hopper with fresh concrete, need slightly insert and smash the concrete, trowel concrete surface, make its and conical hopper upper shed edge parallel and level.
The utility model discloses in, during the scale through transparent side to the distance L reading that fresh concrete flows to the farthest point that the concrete flowed through is accurate, to transparent side vertical projection, and projected scale interval is the L value promptly.
The beneficial effects of the utility model reside in that: the device can directly measure the emptying time and the flow length of the fresh concrete at one time, and the flow length and the emptying time are measured to represent the yield stress and the plastic viscosity of the fresh concrete so as to more accurately describe the working performance of the fresh concrete. The utility model discloses the device is simple, easily operation, has practicality and accuracy.
The utility model relates to a newly mix concrete with simple workable of device of yield stress and plastic viscosity, detection method easy operation has the guide meaning to the concrete working property quantitative characterization among concrete production and the engineering construction.
Drawings
FIG. 1 is a schematic illustration of an apparatus for yield stress and plastic viscosity for fresh concrete;
FIG. 2 is a schematic view of an L-shaped box;
FIG. 3 is a schematic view of a hand gate;
FIG. 4 is a schematic representation of the negative correlation between flow length and measured yield stress value;
FIG. 5 is a graphical representation of the positive correlation between the emptying time and the measured plastic viscosity value.
Reference numbers in the figures: reference numbers in the figures: 1 is conical funnel, and 2 is L shape case, and 3 are manual gate, and 4 are first bar air level, and 5 are second bar air level, and 6 are the experiment flat board, and 7 are the truckle adjusting block, and 11 are the rib, and 21 are rectangular, and 22 are the scale, and 23 is circular opening, and 32 are the pin joint.
Detailed Description
The present invention will be further explained with reference to the drawings and examples. It is to be understood that the description herein is only for purposes of illustrating and explaining embodiments of the present invention and is not intended to limit the embodiments of the present invention.
Example 1: referring to fig. 1-3, an apparatus for providing yield stress and plastic viscosity for fresh concrete includes: conical hopper 1, L shape case 2, manual gate 3, 1# bar air level 4, 2# bar air level 5, experiment flat 6, truckle adjusting block 7, conical hopper 1 is linked together through manual gate 3 and the outstanding top surface of L shape case 2, the top edge at the long side of L shape case 2 is fixed to 1# bar air level 4 level, the top edge at the short side of L shape case 2 is fixed to 2# bar air level 5 level, L shape case is fixed on experiment flat 6, the experiment flat is supported by 4 truckle adjusting blocks 7.
The inner diameter of the upper opening of the conical funnel 1 is 15 cm-20 cm, the lower opening of the conical funnel is 8-9 mm, and the height of the conical funnel is 35 cm-40 cm. The lower opening is connected with a manual gate 3, the inner wall of the conical funnel is provided with a rib 11 with a circular section, the diameter of the section of the rib ranges from 2mm to 5mm, and the rib is fixed on the inner wall of the conical funnel in a continuous spiral downward shape.
The width of the L-shaped box 2 is 15 cm-20 cm, the length of the L-shaped box is 100 cm-130 cm, the height of a chute part at the lower part is 15 cm-20 cm, the L-shaped box is not provided with a sealing cover, the height of a protruding part of a box body at one end is 8 cm-10 cm, the top surface of the L-shaped box is provided with a circular opening 23, and the size of the L-shaped box is consistent. Two long side surfaces 21 of the L-shaped box are made of transparent rigid PVC plates, the thickness of the L-shaped box is larger than or equal to 10mm, the bottom of the outer side of each long side surface is provided with a scale 22 along the length direction, and the minimum division value is 1 mm.
1# bar air level 4, 2# bar air level 5 are commercial high accuracy bar air level, and 1# bar air level 4 sets up the middle top edge at 2 transparent sides 21 of L shape case, and 2# bar air level 5 sets up the top edge of shortest side, and 1# bar air level 4, 2# bar air level 5 all are parallel with 2 bottom surfaces of L type case.
The experiment flat plate 6 is a rigid light aluminum alloy flat plate, is 2-3 cm thick, and is fixed with the bottom surface of the L-shaped box 2.
The caster adjusting blocks 7 are 4 and are respectively fixed at four corners of the experiment flat plate 6 to play a role in supporting and leveling the device.
Referring to fig. 1 to 3, a method for measuring a yield stress and plastic viscosity measuring apparatus for fresh concrete includes the steps of:
(1) placing the device on a horizontal solid plane;
(2) leveling and measuring devices are arranged through caster adjusting blocks and bar-shaped level bubbles;
(3) checking that the manual gate is in a closed state, filling the conical hopper with fresh concrete twice, slightly inserting and tamping the concrete, and trowelling the surface of the concrete to enable the concrete to be flush with the edge of the upper opening of the conical hopper and standing for 5-10 s;
(4) rapidly opening a manual gate, and simultaneously recording the emptying time T of fresh concrete in the conical funnel, wherein T is a specific numerical value and is in the unit of s;
(5) after the fresh concrete flows to a stop in the L-shaped box, reading the flowing distance L of the fresh concrete through the scales of the transparent side edges, vertically projecting the L to the transparent side edges by taking the farthest point where the concrete flows through as the standard during reading, wherein the projected scale value is the L value, and the L is a specific numerical value and is accurate to 0.5cm in the unit of cm;
the embodiment of the utility model provides an in, measure 5 groups of fresh concrete, survey 5 groups of concrete evacuation time and flow length, as shown in the following table, use concrete rheometer to measure these 5 groups of concrete simultaneously, the measuring result shows that flow length and yield stress have fine negative correlation, evacuation time and plastic viscosity have good positive correlation, through flow length and the evacuation time can be more accurate sign fresh concrete's yield stress and plastic viscosity of record, thereby accurate description fresh concrete working property. FIG. 4 is a schematic representation of the negative correlation between flow length and measured yield stress value; FIG. 5 is a graphical representation of the positive correlation between the emptying time and the measured plastic viscosity value.
TABLE 1 fresh concrete flow Length, evacuation time, and measured yield stress and Plastic viscosity
| |
1 | 2 | 3 | 4 | 5 |
| Flow length L/cm | 68 | 73.5 | 82.5 | 84.75 | 102.4 |
| Evacuation time T/s | 67.5 | 12.4 | 18.7 | 35.5 | 34.5 |
| Rheometer measured yield stress tau0/Pa | 30.9 | 24.4 | 19.2 | 18.6 | 16.5 |
| Measuring the plastic viscosity Pa s by a rheometer | 88 | 35.2 | 61.6 | 79.2 | 74.8 |
The present invention has been described in detail with reference to the drawings and the embodiments, and those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details of the embodiments should not be construed as limitations of the invention, which are intended to be covered by the following claims.
Claims (5)
1. The utility model provides a yield stress and plastic viscosity detection device for fresh concrete which characterized in that:
the device comprises a conical funnel, an L-shaped box, a manual gate, a first bar-shaped level bubble, a second bar-shaped level bubble, an experiment flat plate and trundle adjusting blocks, wherein the L-shaped box consists of a top surface protruding from one side of the upper part and a chute arranged at the lower part; the inner wall of the conical funnel is provided with a rib with a circular section, and the rib is fixed on the inner wall of the conical funnel in a continuous spiral downward shape; the first bar-shaped level bubble and the second bar-shaped level bubble are both parallel to the bottom surface of the L-shaped box.
2. The apparatus for detecting yield stress and plastic viscosity for fresh concrete according to claim 1, wherein: the inner diameter of the upper opening of the conical funnel is 15 cm-20 cm, the lower opening of the conical funnel is 8-9 mm, and the height of the conical funnel is 35 cm-40 cm; the bottom of the conical funnel, namely the lower opening, is connected with a manual gate, and the diameter of the section of each rib is 2 mm-5 mm.
3. The apparatus for detecting yield stress and plastic viscosity for fresh concrete according to claim 1, wherein: the width of the L-shaped box is 15 cm-20 cm, the length of the L-shaped box is 100 cm-130 cm, the height of a chute part at the lower part of the L-shaped box is 15 cm-20 cm, no sealing cover is arranged, the horizontal plane of the short side surface is 8 cm-10 cm higher than that of the long side surface, the top surface of the short side surface of the L-shaped box is provided with a circular opening, and the size of the circular opening is consistent with that of the lower opening of the conical funnel; two long side surfaces of the L-shaped box are made of transparent rigid PVC plates, the thickness of the L-shaped box is larger than or equal to 10mm, the bottom of the outer side of the long side surface of the L-shaped box is provided with scales along the length direction, and the minimum division value is 1 mm.
4. The apparatus for detecting yield stress and plastic viscosity for fresh concrete according to claim 1, wherein: the manual gate adopts stainless steel, comprises the semicircle concatenation rectangular form handle of two shape symmetries, is articulated by a pin joint, opens and shuts through the handle, and the biggest angle that opens and shuts is 180, sets up in conical hopper bottom position to be linked together with L shape case bulge's top surface round hole.
5. The apparatus for detecting yield stress and plastic viscosity for fresh concrete according to claim 1, wherein: the experiment flat plate is a rigid light aluminum alloy flat plate, and the thickness of the experiment flat plate is 2-3 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021689963.4U CN212903672U (en) | 2020-08-14 | 2020-08-14 | Yield stress and plastic viscosity detection device for fresh concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021689963.4U CN212903672U (en) | 2020-08-14 | 2020-08-14 | Yield stress and plastic viscosity detection device for fresh concrete |
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| CN212903672U true CN212903672U (en) | 2021-04-06 |
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| CN202021689963.4U Active CN212903672U (en) | 2020-08-14 | 2020-08-14 | Yield stress and plastic viscosity detection device for fresh concrete |
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