CN112610463A - Method for detecting pumping loss performance of pumped concrete - Google Patents
Method for detecting pumping loss performance of pumped concrete Download PDFInfo
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- CN112610463A CN112610463A CN201911148716.5A CN201911148716A CN112610463A CN 112610463 A CN112610463 A CN 112610463A CN 201911148716 A CN201911148716 A CN 201911148716A CN 112610463 A CN112610463 A CN 112610463A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a method for detecting pumping loss performance of pumped concrete, which is used for pumping and transferring the pumped concrete, so that the pumped concrete is subjected to the combined action of pumping pressure and frictional resistance of the pipe wall of a pump pipe, and whether the workability of the concrete can meet the requirement of the construction performance of the pumped concrete is evaluated based on the test.
Description
Technical Field
The invention relates to a method for detecting pumping loss performance of pumped concrete.
Background
The pumping concrete is a concrete pump or a pump truck for transporting and pouring concrete mixtures along a conveying pipe, is an effective concrete mixture transporting mode, has the advantages of high speed and less labor force, and is particularly suitable for transporting and pouring mass concrete and concrete of high-rise buildings.
The pumping concrete construction process is one of the most commonly adopted construction methods at present, and the quality of the construction is important. However, the design of the mix proportion of the pumping concrete in construction in some places is not accurate enough at present, so that engineering accidents occur frequently.
Along with the improvement and influence of national requirements on environmental protection, the quality of concrete raw materials begins to slide down, the usage amount of river sand is gradually reduced, the usage amount of machine-made sand is gradually increased, and the quality changes of cement, fly ash and mineral powder and the like all influence the pumping performance of pumped concrete.
With the development of modernization, high-rise buildings are more and more, the pumping height of the pumped concrete is higher and higher, the pumping pressure of the pumped concrete is increased, and the pumping loss performance of the pumped concrete is influenced by the pumping pressure.
In order to make the produced pumping concrete meet the pumping requirements and reduce the pumping loss, the pumping concrete used is a key influencing factor, and no method for testing and evaluating the pumping loss performance of the pumping concrete to determine whether the pumping concrete meets the production requirements is found at present, so that the deficiency needs to be improved.
Disclosure of Invention
The present invention aims to solve at least one of the above technical problems to at least some extent or to at least provide a useful commercial choice. Therefore, the invention aims to provide a method for detecting pumping loss performance of pumping concrete, which is used for pumping and transferring the pumping concrete to enable the pumping concrete to be subjected to the combined action of pumping pressure and the pipe wall friction resistance of a pump pipe, and evaluating whether the concrete workability of the pumping concrete can meet the requirement of the construction performance of the pumping concrete based on the test.
According to the detection method for pumping loss performance of the pumped concrete, the detection method comprises the following steps:
detecting the index of the concrete mixture and the index of the compressive strength before pumping the pumped concrete;
pumping the pumped concrete by a pumping device, and detecting the pumping pressure in the pumping process;
extracting the pumped concrete from a pump pipe outlet of the pumping device, and uniformly stirring the pumped concrete from the bottom for multiple times to form stirred concrete;
detecting the concrete mixture index and the compressive strength index of the turned concrete;
respectively calculating a first difference value of a concrete mixture index before pumping the pumped concrete and the index of the stirred concrete mixture and a second difference value of a compressive strength index before pumping the pumped concrete and the compressive strength index of the stirred concrete;
and detecting the pumping loss performance of the pumped concrete according to the first difference and the second difference.
According to the method for detecting the pumping loss performance of the pumped concrete, the pumped concrete is pumped and transmitted, so that the pumped concrete is subjected to the combined action of the pumping pressure and the pipe wall friction resistance of the pump pipe, whether the concrete workability can meet the requirement of the construction performance of the pumped concrete is evaluated based on the test, the detection method is simple, convenient and feasible, the verification is reliable, the evaluation and analysis of the change condition of the pumping performance of the pumped concrete after the pumping process are facilitated, the pump blockage and pipe blockage problem of the pumped concrete can be effectively reduced, the acceptance of the pumped concrete is improved, and the construction efficiency and the comprehensive benefit of the concrete are improved.
In addition, the method for detecting pumping loss performance of the pumping concrete according to the invention can also have the following additional technical characteristics:
the concrete mixture indexes before pumping of the pumped concrete comprise slump, expansion, emptying time of an inverted slump cylinder, bleeding rate and plate separation rate; the concrete mixture indexes of the turn-mixed concrete comprise slump, expansion, emptying time of a reverse slump cylinder, bleeding rate and plate separation rate.
The compressive strength indexes before pumping of the pumped concrete comprise a 3d compressive strength index, a 7d compressive strength index and a 28d compressive strength index; the compressive strength indexes of the turned and mixed concrete comprise a 3d compressive strength index, a 7d compressive strength index and a 28d compressive strength index.
Before pumping, the slump is 150 +/-50 mm, the expansion degree is 500 +/-50 mm, the emptying time of the reverse slump cylinder is 0-20 s, the bleeding rate is 0-100%, and the segregation rate is 4.0-25%.
The pumping pressure is 2-10 MPa.
The first difference comprises a slump difference, an expansion difference, an emptying time difference of the reverse slump cone, a bleeding rate difference and a segregation rate difference; the second difference comprises a 3d compressive strength index difference, a 7d compressive strength index difference, and a 28d compressive strength index difference.
When the slump difference is less than or equal to 20mm, the expansion difference is less than or equal to 50mm, the emptying time of the inverted slump cone is less than or equal to 3s, the bleeding rate difference is less than or equal to 5%, the segregation rate difference is less than or equal to 2%, the 3d compressive strength index difference is less than or equal to 2Mpa, the 7d compressive strength index difference is less than or equal to 2Mpa, and the 28d compressive strength index difference is less than or equal to 2Mpa, the pumping loss performance of the pumped concrete is excellent.
When the slump difference is less than or equal to 50mm, the expansion difference is less than or equal to 100mm, the bleeding rate difference is less than or equal to 10%, the emptying time of the inverted slump cone is less than or equal to 6s, the segregation rate difference is less than or equal to 5%, the 3d compressive strength index difference is less than or equal to 4Mpa, the 7d compressive strength index difference is less than or equal to 4Mpa, and the 28d compressive strength index difference is less than or equal to 4Mpa, the pumping loss performance of the pumped concrete is good.
When the slump difference is more than 50mm, the expansion difference is more than 100mm, the bleeding rate difference is more than 10%, the emptying time of the inverted slump cone is more than 6s, the segregation rate difference is more than 5%, the 3d compressive strength index difference is more than 4MPa, the 7d compressive strength index difference is more than 4MPa, and the 28d compressive strength index difference is more than 4MPa, the pumping loss performance of the pumping concrete is poor.
The number of times of uniformly stirring the pumped concrete from the bottom is 2-5.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a method for detecting pumping loss performance of a pumped concrete according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Fig. 1 is a flowchart of a method for detecting pumping loss performance of a pumped concrete according to an embodiment of the present invention. Referring to fig. 1, the present invention provides a method for detecting pumping loss performance of pumping concrete, which is used for detecting pumping loss performance of pumping concrete. The detection method comprises the following steps:
and S10, detecting the index of the concrete mixture and the index of the compressive strength before pumping the pumped concrete.
Specifically, the detection method comprises the steps of firstly detecting concrete mixture indexes and compressive strength indexes of pumped concrete before pumping, wherein the concrete mixture indexes comprise slump, expansion, inverted slump cylinder emptying time, bleeding rate and segregation rate; the compressive strength indexes comprise 3d, 7d and 28d compressive strength indexes, namely the compressive strength index of the pumping concrete on the 3 rd day before pumping, the compressive strength index of the 7 th day and the compressive strength index of the 28 th day.
In one embodiment of the invention, before pumping, the slump of the pumped concrete is 150 +/-50 mm, the expansion degree is 500 +/-50 mm, the emptying time of the inverted slump cone is 0-20 s, the bleeding rate is 0-100%, and the segregation rate is 4.0-25%.
And S20, pumping the pumped concrete through a pumping device, and detecting the pumping pressure in the pumping process.
Specifically, after the concrete mixture index and the compressive strength index of the pumped concrete in S10 are detected, the pumped concrete is pumped by a pumping device, and the pumping pressure during the pumping process is detected. In one embodiment of the invention, the pumping device is a concrete pump or a pump truck; in the present invention, the pumping device is exemplified by a pump truck. The pumping pressure is 2-10 MPa, and in the invention, the pumping pressure is preferably 3-7 MPa.
And S30, extracting the pumped concrete from the outlet of the pump pipe of the pumping device, and uniformly stirring the pumped concrete from the bottom for multiple times to form the stirred concrete.
Specifically, after the pump concrete is subjected to the mixing treatment by the pump truck, the pump concrete is extracted from the outlet of the pump pipe of the pump truck, and the concrete is uniformly turned from the bottom of the pump pipe for multiple times to form the turned concrete. In specific implementation, the pumped concrete can be uniformly turned and stirred from the bottom for 2-5 times; in the present invention, the pumped concrete was uniformly turned 3 times from the bottom.
And S40, detecting the concrete mixture index and the compressive strength index of the turn-mixed concrete.
Specifically, the concrete mixture indexes of the turn-mixed concrete comprise slump, expansion, emptying time of a turn-slump cylinder, bleeding rate and plate-leaving rate; the compressive strength indexes of the turned and mixed concrete comprise a 3d compressive strength index, a 7d compressive strength index and a 28d compressive strength index, namely the compressive strength index of the turned and mixed concrete on the 3 rd day, the compressive strength index of the turned and mixed concrete on the 7 th day and the compressive strength index of the turned and mixed concrete on the 28 th day.
And S50, respectively calculating a first difference value of the concrete mixture index before pumping the pumped concrete and the index of the stirred concrete mixture, and a second difference value of the compressive strength index before pumping the pumped concrete and the compressive strength index of the stirred concrete.
Specifically, the detection method of the invention judges the pumping loss performance of the pumped concrete by respectively detecting the related parameter indexes of the pumped concrete before and after pumping and by the parameter index change values before and after pumping, wherein the first difference comprises a slump difference, an expansion difference, an emptying time difference of a slump cone, a bleeding rate difference and a segregation rate difference, and the second difference comprises a 3d compressive strength index difference, a 7d compressive strength index difference and a 28d compressive strength index difference.
And S60, detecting the pumping loss performance of the pumped concrete according to the first difference and the second difference.
Specifically, when the slump difference is less than or equal to 20mm, the expansion difference is less than or equal to 50mm, the emptying time of the inverted slump cone is less than or equal to 3s, the bleeding rate difference is less than or equal to 5%, the segregation rate difference is less than or equal to 2%, the 3d compressive strength index difference is less than or equal to 2Mpa, the 7d compressive strength index difference is less than or equal to 2Mpa, and the 28d compressive strength index difference is less than or equal to 2Mpa, the pumping loss performance of the pumped concrete is excellent.
When the slump difference is less than or equal to 50mm, the expansion difference is less than or equal to 100mm, the bleeding rate difference is less than or equal to 10%, the emptying time of the inverted slump cone is less than or equal to 6s, the segregation rate difference is less than or equal to 5%, the 3d compressive strength index difference is less than or equal to 4Mpa, the 7d compressive strength index difference is less than or equal to 4Mpa, and the 28d compressive strength index difference is less than or equal to 4Mpa, the pumping loss performance of the pumped concrete is good.
When the slump difference is more than 50mm, the expansion difference is more than 100mm, the bleeding rate difference is more than 10%, the emptying time of the inverted slump cone is more than 6s, the segregation rate difference is more than 5%, the 3d compressive strength index difference is more than 4MPa, the 7d compressive strength index difference is more than 4MPa, and the 28d compressive strength index difference is more than 4MPa, the pumping loss performance of the pumping concrete is poor.
The detection method of the invention evaluates slump difference, expansion difference, emptying time of a reverse slump cone, bleeding rate difference, segregation rate difference and differences of 3d, 7d and 28d compressive strength in indexes as necessary conditions, and if the indexes exceed the pumping loss performance index requirement range, the pumping loss performance is reduced by one grade.
The method for detecting pumping loss performance of the pumped concrete of the present invention is demonstrated below in several specific examples.
Example 1
C30 pump concrete, the concrete mix proportion is shown in Table 1.
Table 1C 30 units of pump concrete: kilogram (kilogram)
| Water (W) | Cement | Fly ash | Mineral powder | River sand | 5-20 parts of crushed stone | 16.5-31.5 parts of gravel | Pumping agent |
| 172 | 265 | 60 | 35 | 800 | 305 | 713 | 7 |
C30 pumping concrete mixture and carrying out pumping loss performance evaluation through a pumping loss device of the pumping concrete. The test properties are shown in Table 2.
TABLE 2C 30 Pump loss Performance test
As can be seen from Table 2, the difference in slump before and after pumping is 15mm, the difference in expansion is 35mm, the difference in segregation rate is 1.3%, the difference in bleeding rate is 3.8%, the difference in 3d compressive strength is 0.6MPa, the difference in 7d compressive strength is 1.1MPa, and the difference in 28d compressive strength is 0.5MPa, the pumping loss performance is excellent, and the requirement of I in the evaluation index is met.
Example 2
C25 pump concrete, the concrete mix proportion is shown in Table 3.
Table 3C 25 units of pump concrete: kilogram (kilogram)
| Water (W) | Cement | Fly ash | Mineral powder | Machine-made sand | 5-20 parts of crushed stone | 16.5-31.5 parts of gravel | Pumping agent |
| 176 | 235 | 50 | 35 | 840 | 315 | 663 | 7.8 |
C25 pumping concrete mixture and carrying out pumping loss performance evaluation through a pumping loss device of the pumping concrete. The test properties are shown in Table 4.
TABLE 4C 25 Pump loss Performance test
As can be seen from Table 4, the difference in slump before and after pumping was 25mm, the difference in expansion was 60mm, the difference in segregation rate was 2.3%, the difference in bleeding rate was 9.8%, the difference in 3d compressive strength was 1.6MPa, the difference in 7d compressive strength was 2.1MPa, and the difference in 28d compressive strength was 1.8MPa, and the pumping loss performance was good and met the requirements of II in the evaluation index.
Example 3
C50 pump concrete, the concrete mix proportion is shown in Table 5.
Table 5C 50 units of pump concrete: kilogram (kilogram)
| Water (W) | Cement | Fly ash | Mineral powder | River sand | 5-20 parts of crushed stone | 16.5-31.5 parts of gravel | Pumping agent |
| 155 | 380 | 50 | 75 | 702 | 375 | 673 | 11 |
C50 pumping concrete mixture and carrying out pumping loss performance evaluation through a pumping loss device of the pumping concrete. The test properties are shown in Table 6.
TABLE 6C 50 Pump loss Performance test
As can be seen from Table 6, the difference in slump before and after pumping was 10mm, the difference in expansion was 20mm, the difference in segregation rate was 1.3%, the difference in bleeding rate was 0%, the difference in 3d compressive strength was 0.4MPa, the difference in 7d compressive strength was 0.9MPa, and the difference in 28d compressive strength was 1.1MPa, and the pumping loss performance was good and met the requirements of II in the evaluation index.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. A method for detecting pumping loss performance of pumping concrete is characterized by comprising the following steps:
detecting the index of the concrete mixture and the index of the compressive strength before pumping the pumped concrete;
pumping the pumped concrete by a pumping device, and detecting the pumping pressure in the pumping process;
extracting the pumped concrete from a pump pipe outlet of the pumping device, and uniformly stirring the pumped concrete from the bottom for multiple times to form stirred concrete;
detecting the concrete mixture index and the compressive strength index of the turned concrete;
respectively calculating a first difference value of a concrete mixture index before pumping the pumped concrete and the index of the stirred concrete mixture and a second difference value of a compressive strength index before pumping the pumped concrete and the compressive strength index of the stirred concrete;
and detecting the pumping loss performance of the pumped concrete according to the first difference and the second difference.
2. The method for detecting pumping loss performance of the pumped concrete according to claim 1, wherein the concrete mixture indexes before pumping of the pumped concrete comprise slump, expansion, inverted slump cone emptying time, bleeding rate and plate leaving rate; the concrete mixture indexes of the turn-mixed concrete comprise slump, expansion, emptying time of a reverse slump cylinder, bleeding rate and plate separation rate.
3. The method for detecting pumping loss performance of the pumped concrete according to claim 2, wherein the compressive strength index before pumping of the pumped concrete comprises a 3d compressive strength index, a 7d compressive strength index and a 28d compressive strength index; the compressive strength indexes of the turned and mixed concrete comprise a 3d compressive strength index, a 7d compressive strength index and a 28d compressive strength index.
4. The method for detecting the pumping loss performance of the pumped concrete as claimed in claim 2, wherein the slump before pumping of the pumped concrete is 150 +/-50 mm, the spreading degree is 500 +/-50 mm, the emptying time of the inverted slump cone is 0-20 s, the bleeding rate is 0-100%, and the segregation rate is 4.0-25%.
5. The method for detecting pumping loss performance of the pumped concrete according to claim 1, wherein the pumping pressure is 2-10 MPa.
6. The method for detecting pumping loss performance of a pumping concrete according to claim 3, wherein the first difference value comprises a slump difference value, an expansion difference value, an inverted slump cone emptying time difference value, a bleeding rate difference value and a segregation rate difference value; the second difference comprises a 3d compressive strength index difference, a 7d compressive strength index difference, and a 28d compressive strength index difference.
7. The method for detecting the pumping loss performance of the pumped concrete according to claim 6, wherein the pumping loss performance of the pumped concrete is excellent when the slump difference is not greater than 20mm, the expansion difference is not greater than 50mm, the emptying time of the inverted slump cone is not greater than 3s, the bleeding rate difference is not greater than 5%, the segregation rate difference is not greater than 2%, the 3d compressive strength index difference is not greater than 2Mpa, the 7d compressive strength index difference is not greater than 2Mpa, and the 28d compressive strength index difference is not greater than 2 Mpa.
8. The method for detecting the pumping loss performance of the pumped concrete according to claim 6, wherein the pumping loss performance of the pumped concrete is good when the slump difference is less than or equal to 50mm, the expansion difference is less than or equal to 100mm, the bleeding rate difference is less than or equal to 10%, the emptying time of an inverted slump cone is less than or equal to 6s, the segregation rate difference is less than or equal to 5%, the 3d compressive strength index difference is less than or equal to 4MPa, the 7d compressive strength index difference is less than or equal to 4MPa, and the 28d compressive strength index difference is less than or equal to 4 MPa.
9. The method for detecting the pumping loss performance of the pumped concrete according to claim 6, wherein the pumping loss performance of the pumped concrete is poor when the slump difference is greater than 50mm, the expansion difference is greater than 100mm, the bleeding rate difference is greater than 10%, the emptying time of an inverted slump cone is greater than 6s, the segregation rate difference is greater than 5%, the 3d compressive strength index difference is greater than 4MPa, the 7d compressive strength index difference is greater than 4MPa, and the 28d compressive strength index difference is greater than 4 MPa.
10. The method as claimed in any one of claims 1 to 9, wherein the number of times of uniformly stirring the pumped concrete from the bottom is 2 to 5.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113433032A (en) * | 2021-06-10 | 2021-09-24 | 华润建筑有限公司 | Test and evaluation method for pressure expansion degree variation of cement concrete mixture |
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| CN105649271A (en) * | 2014-10-08 | 2016-06-08 | 安徽宝翔建设集团有限责任公司 | Construction method of self-mixing high-grade concrete composite hooped column |
| CN109781338A (en) * | 2019-01-24 | 2019-05-21 | 中建三局集团有限公司 | Concrete pumping monitors system and method |
| CN110259656A (en) * | 2019-06-17 | 2019-09-20 | 重庆大学 | Pump concrete nonstationary flow pumping pressure dynamic analysing method |
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2019
- 2019-11-21 CN CN201911148716.5A patent/CN112610463B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1122636A (en) * | 1997-07-01 | 1999-01-26 | Kyokuto Kaihatsu Kogyo Co Ltd | Kinds of machines selecting device of concrete pump |
| CN105649271A (en) * | 2014-10-08 | 2016-06-08 | 安徽宝翔建设集团有限责任公司 | Construction method of self-mixing high-grade concrete composite hooped column |
| CN109781338A (en) * | 2019-01-24 | 2019-05-21 | 中建三局集团有限公司 | Concrete pumping monitors system and method |
| CN110259656A (en) * | 2019-06-17 | 2019-09-20 | 重庆大学 | Pump concrete nonstationary flow pumping pressure dynamic analysing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113433032A (en) * | 2021-06-10 | 2021-09-24 | 华润建筑有限公司 | Test and evaluation method for pressure expansion degree variation of cement concrete mixture |
| CN113433032B (en) * | 2021-06-10 | 2023-08-04 | 华润建筑有限公司 | Cement concrete mixture pressure expansion degree variation test and evaluation method |
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