CN118190714A - Static rheological evaluation method for concrete - Google Patents
Static rheological evaluation method for concrete Download PDFInfo
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- CN118190714A CN118190714A CN202410344852.6A CN202410344852A CN118190714A CN 118190714 A CN118190714 A CN 118190714A CN 202410344852 A CN202410344852 A CN 202410344852A CN 118190714 A CN118190714 A CN 118190714A
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- 230000003068 static effect Effects 0.000 title claims abstract description 31
- 238000011156 evaluation Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 38
- 238000007599 discharging Methods 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 27
- 230000009471 action Effects 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 17
- 238000000518 rheometry Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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Abstract
The invention discloses a static rheological evaluation method of concrete, which comprises the following steps: acquiring the no-load weight of the torpedo tank when the torpedo tank is in no-load; when the mixing station finishes discharging, the torpedo ladle controller controls the torpedo ladle to slide on the track, and the transportation action is executed; when the positioning device above the spreader is detected, the torpedo tank stops sliding; the torpedo ladle controller controls the rotating device to discharge and monitor the pressure of the air spring, wherein the air spring is arranged on the rotating device; determining a concrete decrement curve reacted in the unloading process of the torpedo tank according to the air spring pressure; and evaluating the static rheological property of the concrete according to a concrete decrement curve reacted in the unloading process of the torpedo ladle.
Description
Technical Field
The invention relates to the technical field of static rheological evaluation of concrete, in particular to a static rheological evaluation method of concrete.
Background
The concrete rheological parameters (mainly refer to yield stress and plastic viscosity) are basic physical parameters for describing the flow property of the concrete mixture, and the rheological parameters reflect the workability of the fresh concrete, so that the numerical change of the concrete rheological parameters is obviously influenced by the components of the fresh concrete. At present, parameters such as slump, expansion degree, pouring barrel, T500 and the like are mainly measured after sampling at a mixing station to reflect the rheological property of concrete, and the process is limited by manual experience and cannot be well evaluated.
Disclosure of Invention
The invention aims to provide a static rheological evaluation method for concrete, which aims to solve the technical problems.
According to one aspect of the application, the application provides a static rheological evaluation method of concrete, comprising the following steps: acquiring the no-load weight of the torpedo tank when the torpedo tank is in no-load; when the mixing station finishes discharging, the torpedo ladle controller controls the torpedo ladle to slide on the track, and the transportation action is executed; when the positioning device above the spreader is detected, the torpedo tank stops sliding; the torpedo ladle controller controls the rotating device to discharge and monitor the pressure of the air spring, wherein the air spring is arranged on the rotating device; determining a concrete decrement curve reacted in the unloading process of the torpedo tank according to the air spring pressure; and evaluating the static rheological property of the concrete according to a concrete decrement curve reacted in the unloading process of the torpedo ladle.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. According to the concrete static rheological evaluation method provided by the invention, the concrete static rheological characteristic is evaluated according to the concrete decrement curve reacted in the torpedo tank discharging process, so that the whole process automatic on-line monitoring is realized, and the rheological property of the concrete can be well evaluated.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
FIG. 1 is a flow chart of an alternative method of static rheology evaluation of concrete according to an embodiment of the application.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention. It should be noted that the present invention is already in a practical development and use stage.
In some embodiments, the concrete rheological parameters (mainly refer to yield stress and plastic viscosity) are basic physical parameters describing the flowability of the concrete mixture, and for fresh concrete, the rheological parameters reflect the workability of the fresh concrete, and the numerical variation is significantly affected by the components of the fresh concrete. This procedure is limited on the one hand by manual experience and on the other hand there is a certain time delay in the sampling test and these indicators do not allow to evaluate the rheological properties of the concrete completely.
It will be appreciated that the above solution suffers from at least the following drawbacks:
1) The detection process is slow and the efficiency is low;
2) The detection quality is unstable and is limited by the experience of a sampling worker, the detection temperature, the detection humidity and the like;
3) A detector is required to detect.
In some embodiments of the application, the concrete static rheological properties may be additionally evaluated using a concrete decrement curve reacted to by the torpedo tank discharging process.
Alternatively, as an alternative embodiment, as shown in fig. 1, it includes:
s101, acquiring the no-load weight of the torpedo tank when the torpedo tank is in no-load state;
S102, after the mixing station finishes discharging, the torpedo ladle controller controls the torpedo ladle to slide on the track, and the transportation action is executed;
S103, stopping sliding the torpedo tank after detecting the positioning device above the spreader;
s104, controlling a rotating device to discharge by a torpedo controller, and monitoring the pressure of an air spring, wherein the air spring is arranged on the rotating device;
s105, determining a concrete decrement curve reacted in the torpedo tank unloading process according to air spring pressure;
s106, evaluating static rheological property of the concrete according to a concrete decrement curve reacted in the unloading process of the torpedo ladle.
In some embodiments of the application, the torpedo tank is a rotary drum type, the standard capacity is N m 3, and the left end and the right end are respectively provided with a rotary device, so that the torpedo tank can be discharged in a 180-degree rotation mode. Two air springs with the cross section of S square meters are respectively installed on the outer side of the rotating device, pressure sensors are installed on the top ends of the air springs, the rotating device is connected with the top ends of the air springs through corner connecting pieces, the bottom ends of the air springs are installed on the fixing support, the fixing support (also can be called a support) is in a hollowed cuboid shape, the air springs are fixed on a rectangular base of the fixing support, four support columns of the fixing support are hung on a rail through sliding devices, positioning sensors are installed on the rail, and therefore torpedo tanks can be accurately positioned above a discharge hole of a mixing station and a prefabricated part production line distributor. Thus, the torpedo tank transports the concrete produced by the mixing station to each prefabricated part production line by sliding on the rail, and each production line carries out material distribution production through the material distributor.
The torpedo tank controller is installed on the left corner connecting piece (rotating device side), the controller receives air spring pressure sensor signals, track positioning signals and mixing station information, the detected torpedo tank pressure change characteristics representing static rheological property of concrete are fed back to the mixing station, mixing station can adjust mixing ratio parameters according to the characteristic parameters, and accordingly working property of the concrete is adjusted, and meanwhile the controller achieves sliding and rotating of the torpedo tank through controlling the sliding device and the rotating device.
In some embodiments of the application, the weighing means may be air springs (4 air springs are designed to meet the impact pressure of each mixing station unloading process and the weight of the torpedo tank (about 5 t) and the concrete itself (about 7.5t calculated from 3 square concrete)) according to a maximum of 6t of each air spring, but not limited to this form, a column type tension sensor, etc. may be used.
Alternatively, as an alternative embodiment, the concrete decrement curve at the time t of the ith discharging process of the torpedo tank is calculated based on the following expression:
mc(i)(t)＝(PLx(i)(t)+PLy(i)(t)+PRx(i)(t)+PRy(i)(t))*S/g
Wherein i is the number of transportation, mc (i) (t) is a concrete decrement curve, S is the sectional area of the air spring, the air spring pressure comprises two left air spring pressures and two right air spring pressures, the two left air spring pressures are PLx (i) (t) and PLy (i) (t), the two right air spring pressures are PRx (i) (t) and PRy (i) (t), g is gravity acceleration, and x and y are constants.
Optionally, as an optional embodiment, acquiring the load weight of the torpedo under load and the idle weight under idle load includes:
firstly, a torpedo tank controller detects an idle load pressure value of a torpedo tank to obtain the idle load weight of the torpedo tank;
After receiving the signal for starting discharging, the stirring station starts discharging to the torpedo tank;
after the stirring station finishes the unloading action, the stirring station sends out a signal for stopping unloading;
the torpedo tank controller responds to receiving a discharging stop signal sent by the stirring station, and detects the termination pressure value of the torpedo tank under load;
determining the load weight of the torpedo tank according to the termination pressure value;
And determining the concrete volume weight transported by the torpedo according to the empty weight and the load weight.
The torpedo tank controller continuously records weight data of the torpedo tank, the weight data before unloading of the stirring station is no-load weight, and the weight data after unloading of the stirring station is load weight.
Optionally, as an alternative embodiment, determining the concrete volume weight transported by the torpedo tank according to the empty weight and the loaded weight includes:
According to the number of discharging parties obtained by the torpedo ladle controller from the stirring station;
And calculating the concrete volume weight transported by the torpedo based on the unloading number, the no-load weight and the load weight.
Optionally, as an alternative embodiment, determining the load weight of the torpedo tank according to the end pressure value includes:
The load weight of the torpedo tank was calculated based on the following expression:
Me(i)＝(PL3(i)+PL4(i)+PR3(i)+PR4(i))*S/g
Where Me (i) is the load weight of the torpedo tank, S is the cross-sectional area of the air spring, the air spring pressure includes two left air spring pressures PL3 (i), PL4 (i), and two right air spring pressures PR3 (i), PR4 (i), g is the gravitational acceleration.
Alternatively, as an alternative embodiment, the static rheological properties of the concrete are evaluated based on the concrete decrement curve and the concrete volume weight reacted by the torpedo tank discharging process.
Optionally, as an optional implementation manner, after the transportation is completed, recording the termination pressure after the torpedo tank is completely unloaded;
And determining the weight of the torpedo tank after the torpedo tank is unloaded according to the end pressure of the torpedo tank after the torpedo tank is unloaded.
Alternatively, as an alternative embodiment, the residual concrete inventory after the torpedo is discharged is calculated from the empty weight and the weight of the torpedo after the discharge is completed.
Alternatively, as an alternative embodiment, the static rheological properties of the concrete are evaluated from the concrete decrement curve mc (i) (t), the concrete bulk weight and the residual concrete inventory reacted by the torpedo tank discharging process.
In some embodiments of the present application, in a specific implementation manner of the present application, S1, a transportation number timer is provided inside the torpedo tank controller, the number of transportation of the torpedo tank is marked as 1,2 … i, and after the torpedo tank is cleaned once, the transportation number timer is cleared;
S2, when the torpedo tank starts to be transported for the ith time, the torpedo tank controller firstly obtains initial pressure of the torpedo tank when in no-load by reading a pressure sensor signal, two left side pressures are respectively marked as PL1 (i) and PL2 (i), two right side pressures are respectively marked as PR1 (i) and PR2 (i), and then the weight of the torpedo tank when in no-load is as follows: ms (i) = (PL 1 (i) +pl2 (i) +pr1 (i) +pr2 (i)) ·s/g;
S3, continuously monitoring the pressures at the left side and the right side after receiving a start unloading signal of a stirring station when the torpedo tank is transported for the ith time, and recording two left air spring pressures PLm (i) (t) and PLn (i) (t) at the moment t, wherein the two right air spring pressures are PRm (i) (t) and PRn (i) (t), and the weight of the torpedo tank at the moment t of the unloading process of the stirring station is M (i) (t) = (PLm (i) (t) +PLn (i) (t) +PRm (i) (t) +PRn (i) (t)). S/g;
S4, acquiring a concrete increment curve mc (i) (t) =M (i) (t) -Ms (i) caused by unloading of a mixing plant according to the S2 and the S3 controllers;
S5, in the ith transportation process, after the controller receives a stop unloading signal of the stirring station, recording the termination pressure of the torpedo tank under load, wherein two left side pressures are respectively marked as PL3 (i) and PL4 (i), two right side pressures are respectively marked as PR3 (i) and PR4 (i), and the weight of the torpedo tank under load is as follows: me (i) = (PL 3 (i) +PL4 (i) +PR3 (i) +PR4 (i)). S/g, the weight of concrete transported by the torpedo tank is Mc1 (i) =Me (i) -Ms (i), and according to the number N m 3 of the discharging parts obtained by the controller from the mixing station, N < N, calculating the volume weight of the concrete as ρ (i) =Mc (i)/N, and feeding back the volume weight information of the concrete to the mixing station;
S6, after the mixing station finishes discharging, the torpedo tank controller controls the torpedo tank to slide on the track, the ith transport action is executed, when the positioning device above the material distributor is detected, the sliding is stopped, the rotating device is controlled to discharge, the air spring pressure is continuously monitored in the discharging process, the two left air spring pressures PLx (i) (t) and PLy (i) (t) at the moment t are recorded, the two right air spring pressures are PRx (i) (t) and PRy (i) (t), and then the weight change curve of the torpedo tank at the moment t in the ith discharging process of the torpedo tank is as follows: mc (i) (t) = (PLx (i) (t) +ply (i) (t) +prx (i) (t) +pry (i) (t)) =s/g, and feeding back the characteristic curve to the mixing station;
S7, after the ith transportation is completed, recording the end pressure of the torpedo tank after the unloading is completed, wherein two left side pressures are respectively marked as PLz (i) and PLz (i), and two right side pressures are respectively marked as PRz (i) and PRz (i), wherein the weight of the torpedo tank after the unloading is completed is Mc2 (i) = (PLz (i) +PLz (i) +PRz (i))S/g, and the residual concrete storage amount of the torpedo tank after the unloading is Mc3 (i) = |Mc2 (i) -Ms (i) |;
S8, the static rheological property of the concrete is evaluated in a complementary mode according to a concrete increment curve Mc (i) (t) reacted by discharging of the mixing plant, a concrete volume weight rho (i), a concrete decrement curve Mc (i) (t) reacted by discharging of the torpedo tank and a residual concrete storage Mc3 (i) after discharging of the torpedo tank, and the evaluation result is fed back to the mixing plant so that the working performance of the mixing plant can be adjusted in time.
S9, the torpedo tank controller controls the torpedo tank to return to the receiving position below the stirring station, and after sliding to the positioning device corresponding to the discharge port of the stirring station, the torpedo tank controller stops sliding, returns to S1 and waits for the (i+1) th transportation.
Wherein m, n, x and y are all constants.
Based on the embodiment provided by the application, the static rheological property of the concrete can be evaluated according to the concrete increment curve reacted by the torpedo tank in the unloading process of the mixing station, the concrete volume weight, the concrete decrement curve reacted by the torpedo tank in the unloading process and the residual concrete storage quantity after the torpedo tank is unloaded, and the evaluation result is fed back to the mixing station so as to timely adjust the working performance of the mixing station. On one hand, the automatic online monitoring of the whole process is realized, the labor force is liberated, and on the other hand, the time delay brought by laboratory inspection is solved, the detection is more accurate and timely through sampling detection, and the concrete accurate control is realized more favorably.
In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
It should be noted that, for simplicity of description, the foregoing embodiments are all illustrated as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts, as some steps may be performed in other order or concurrently in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present application.
The foregoing detailed description of the invention has been presented for purposes of illustration and description, and it should be understood that the invention is not limited to the particular embodiments disclosed, but is intended to cover all modifications, equivalents, alternatives, and improvements within the spirit and principles of the invention.
Claims (9)
1. A method for evaluating static rheology of concrete, comprising:
acquiring the no-load weight of the torpedo tank when the torpedo tank is in no-load;
when the mixing station finishes discharging, the torpedo ladle controller controls the torpedo ladle to slide on the track, and the transportation action is executed;
After detecting the positioning device above the spreader, stopping sliding the torpedo tank;
The torpedo ladle controller controls the rotating device to discharge and monitor the pressure of the air spring, wherein the air spring is arranged on the rotating device;
determining a concrete decrement curve reacted in the torpedo tank unloading process according to the air spring pressure;
and evaluating static rheological property of the concrete according to the concrete decrement curve reacted in the unloading process of the torpedo tank.
2. The method for evaluating static rheology of concrete according to claim 1, characterized in that,
The concrete decrement curve of the ith discharging process t of the torpedo tank is calculated based on the following expression:
mc(i)(t)＝(PLx(i)(t)+PLy(i)(t)+PRx(i)(t)+PRy(i)(t))*S/g
wherein i is the number of transportation, mc (i) (t) is the concrete decrement curve, S is the sectional area of the air spring, the air spring pressure comprises two left air spring pressures and two right air spring pressures, the two left air spring pressures are PLx (i) (t) and PLy (i) (t) respectively, the two right air spring pressures are PRx (i) (t) and PRy (i) (t) respectively, g is the gravitational acceleration, and x and y are constants.
3. The method of static rheological evaluation of concrete according to claim 2, wherein obtaining the load weight of the torpedo tank load comprises:
firstly, a torpedo tank controller detects an idle load pressure value of a torpedo tank to obtain the idle load weight of the torpedo tank;
After receiving the signal for starting discharging, the stirring station starts discharging to the torpedo tank;
after the stirring station finishes the unloading action, the stirring station sends out a signal for stopping unloading;
The torpedo tank controller responds to receiving a discharging stop signal sent by the stirring station, and detects a termination pressure value of the torpedo tank under load;
Determining a load weight of the torpedo tank according to the termination pressure value;
and determining the concrete volume weight transported by the torpedo according to the empty weight and the load weight.
4. A method of static rheological evaluation of concrete according to claim 3 wherein determining the concrete volume weight of the torpedo tank transportation based on the empty weight and the loaded weight comprises:
according to the unloading party number obtained by the torpedo ladle controller from the stirring station;
and calculating the volume weight of the concrete transported by the torpedo tank based on the unloading number, the empty weight and the load weight.
5. The method of static rheological evaluation of concrete according to claim 2, wherein the determining the load weight of the torpedo tank according to the termination pressure value comprises:
the load weight of the torpedo tank was calculated based on the following expression:
Me(i)＝(PL3(i)+PL4(i)+PR3(i)+PR4(i))*S/g
Me (i) is the load weight of the torpedo tank, S is the sectional area of the air spring, the air spring pressure comprises two left air spring pressures and two right air spring pressures, the two left air spring pressures are PL3 (i) and PL4 (i), the two right air spring pressures are PR3 (i) and PR4 (i), and g is gravity acceleration.
6. The method for evaluating static rheology of concrete according to claim 5 characterized in that,
And evaluating the static rheological property of the concrete according to the concrete decrement curve and the concrete volume weight reacted in the torpedo tank discharging process.
7. The method for evaluating static rheology of concrete according to claim 6 characterized in that,
After transportation is completed, recording the termination pressure of the torpedo tank after discharging is completed;
And determining the weight of the torpedo tank after the torpedo tank is unloaded according to the termination pressure of the torpedo tank after the torpedo tank is unloaded.
8. The method for evaluating static rheology of concrete according to claim 7 characterized in that,
And calculating the residual concrete storage after the torpedo tank is unloaded according to the empty weight and the weight of the torpedo tank after the unloading is completed.
9. The method for evaluating static rheology of concrete according to claim 8 characterized in that,
And evaluating the static rheological property of the concrete according to the concrete decrement curve mc (i) (t), the concrete volume weight and the residual concrete storage amount reacted by the torpedo tank discharging process.
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| CN202410344852.6A CN118190714B (en) | 2024-03-25 | 2024-03-25 | Static rheological evaluation method for concrete |
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| CN202410344852.6A CN118190714B (en) | 2024-03-25 | 2024-03-25 | Static rheological evaluation method for concrete |
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| CN118190714B (en) | 2024-09-17 |
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