CN105572328A - Device and methods for testing high pressure stability and pumping limit performance of concrete - Google Patents
Device and methods for testing high pressure stability and pumping limit performance of concrete Download PDFInfo
- Publication number
- CN105572328A CN105572328A CN201510923307.3A CN201510923307A CN105572328A CN 105572328 A CN105572328 A CN 105572328A CN 201510923307 A CN201510923307 A CN 201510923307A CN 105572328 A CN105572328 A CN 105572328A
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- concrete
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- proving installation
- high pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
Abstract
The invention discloses a device for testing the high pressure stability and pumping limit performance of concrete. The device comprises a test cylinder, a cone-shaped tube and a pump pipe, wherein the test cylinder is internally provided with a piston capable of sliding along the axial direction on the inner wall of the test cylinder; the outer end surface of the piston is connected with an externally arranged propeller; one end of the test cylinder is connected with the large-aperture end of the cone-shaped tube, and the small-aperture end of the cone-shaped tube is connected with one end of the pump pipe; a discharge hole is formed at the other end of the pump pipe; a stop valve is arranged at the discharge hole; a feeding hole is formed in the cone-shaped tube; a pressure sensor is arranged in the pump pipe; the axes of the test cylinder, the cone-shaped tube and the pump pipe are overlapped. The invention also discloses a method for testing the high pressure stability of the concrete and a method for testing the pumping limit performance of the concrete. After the device and the methods are adopted, the ultrahigh pumping pressure environment of the concrete can be simulated in the actual construction process, so that the high pressure stability of the pump concrete can be detected; the device and the methods are good in detection effect and high in accuracy of the testing results, thus being used for evaluating the performances of the concrete in a limit pumping state.
Description
Technical field
The present invention relates to testing concrete performance field, be specifically related to proving installation and the method for testing of a kind of High Pressure Reinforced Concrete stability and pumping limit performance.
Background technology
Concrete Pumping Construction, refers to that concrete is poured into a mould to construction point by pump machine and Cemented filling.Along with the lifting of pumping construction height, the pressure in pumping line also improves constantly, and this makes concrete except need possessing excellent mobility, cohesiveness and homogeneity, also must have the hold facility of its excellent properties under hyperbaric environment.
At present, usually adopt Pressure-flow study method test pumpability of concrete in pressure environment both at home and abroad, wherein main to detect these three performance parameters of concrete mobility, cohesiveness and homogeneity.But along with popularizing of high-efficiency water-reducing agent of poly-carboxylic acid, concrete mix water consumption significantly reduces, the bleeding quantity (V of Pressure-flow study instrument test
10, V
140) significantly reduce, the test result adopting Pressure-flow study method to obtain deviation compared with actual result is comparatively large, and reference value also decreases; Meanwhile, Pressure-flow study method can only detect static concrete performance usually, and the test result adopting the method to obtain can not be used for weighing the quality of concrete performance under high pressure pumping state.Therefore, be necessary to improve prior art.
Summary of the invention
The technical problem to be solved in the present invention is, for the deficiencies in the prior art, provides that a kind of structure is simple, the High Pressure Reinforced Concrete stability of good test effect and the proving installation of pumping limit performance and method of testing.
The technical solution used in the present invention is: the proving installation of a kind of High Pressure Reinforced Concrete stability and pumping limit performance, comprise test barrel, tapered tube and pump line, being installed in test barrel can along test barrel inwall piston in axial sliding, and piston outer face is connected with the thruster of peripheral hardware; Test barrel one end is connected with the heavy caliber end of tapered tube, and the small-caliber end of tapered tube is connected with one end of pump line, and the other end of pump line offers discharging opening, and discharge outlet is installed on stop valve; Described tapered tube offers charging aperture.
By such scheme, in described pump line, be installed on pressure transducer.
By such scheme, the dead in line of described test barrel, tapered tube and pump line.
By such scheme, the axes normal of described charging aperture is in the axis of tapered tube.
By such scheme, described thruster is hydraulic pusher or air pressure thruster, electric plating propulsion.
By such scheme, ring flange or cuff between test barrel with tapered tube, between tapered tube with pump line, between pump line with stop valve, between tapered tube with charging aperture, is adopted to be connected.
The invention provides a kind of method of testing of High Pressure Reinforced Concrete stability, comprise the following steps:
Step one, provide proving installation as above;
Step 2, air-tight test is carried out to described proving installation;
The expansion degree K of step 3, test concrete sample
0, after closing the stop valve of described proving installation, concrete sample is loaded in test barrel, hermetical testing device;
Step 4, startup thruster, at the uniform velocity carry the pressure in test barrel to pressure P, the duration of this pressure P is t;
Step 5, open stop valve and be reduced to atmospheric pressure to the pressure P in test barrel, collect the concrete that discharging opening is discharged, test its divergence K
1;
At the uniform velocity discharge the residual concrete in test barrel after step 6, pressure release, and test its divergence K
2;
Step 7, pass through formula
Calculate the high pressure pumping stability G of this concrete sample
b.
By such scheme, in step 3, the volume of described concrete sample is not less than 2/3rds of test barrel volume.
Present invention also offers a kind of method of testing of concrete pumping limiting performance, comprise the following steps:
Step one, provide proving installation as above;
Step 2, air-tight test is carried out to described proving installation;
Step 3, close the stop valve of described survey device, concrete sample is loaded in test barrel, airtight described proving installation;
Step 4, startup thruster, at the uniform velocity carry the pressure in test barrel to pressure P, the duration of this pressure P is t;
The position of step 5, maintenance piston is fixed, and open stop valve, the pressure in cylinder to be tested is decreased to atmospheric pressure, closes stop valve after discharge section concrete;
Step 6, repetition step 4 and step 5, until pump line blocking, the number of times J of stop valve now opened in record, the pumping limit performance J of this concrete sample
b=J;
By such scheme, in step 3, the volume of described concrete sample is not less than 2/3rds of test barrel volume.
Compared with prior art, the invention has the beneficial effects as follows: 1), this proving installation can be under laboratory conditions, concrete superelevation pump pressure environment in simulation practice of construction process, realize the detection of pump concrete high-voltage-stable performance, Detection results is good, the accuracy of testing result is high, can evaluate the quality of concrete performance under limit pumping state; 2) this proving installation is simple and reasonable, swift to operate, good reliability, makes operating cost low, practical.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention's specific embodiment.
Wherein: 1, thruster; 2, piston; 3, test barrel; 4, tapered tube; 5, charging aperture; 6, pump line; 7, pressure transducer; 8, stop valve.
Embodiment
In order to understand the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is further described.
A kind of High Pressure Reinforced Concrete stability as shown in Figure 1 and the proving installation of pumping limit performance, comprise test barrel 3, tapered tube 4 and pump line 6, test barrel 3 is installed on can along test barrel 3 inwall piston 2 in axial sliding, piston 2 is connected with the thruster 1 of outside, and thruster 1 promotes piston 1 and slides in test barrel 3; One end of test barrel 3 is connected with the heavy caliber end of tapered tube 4, and the small-caliber end of tapered tube 4 is connected with one end of pump line 6, and the internal diameter of tapered tube 4 heavy caliber end is identical with test barrel 3 internal diameter, and the internal diameter of tapered tube 4 small-caliber end is identical with the internal diameter of pump line 6; The other end of pump line 6 offers discharging opening, and discharge outlet is installed on stop valve 8; Pressure transducer 7 is installed in pump line 6; Tapered tube 4 offers charging aperture 5, the axes normal of charging aperture 5 is in the axis of tapered tube 4, and the height of charging aperture 5 is higher than the height of test barrel 3; Test barrel 3, tapered tube 4 and pump line 6 be horizontal positioned all, the dead in line of three.
In the present invention, between test barrel 3 with tapered tube 4, between tapered tube 4 with pump line 6, between pump line 6 with stop valve 8, between tapered tube 4 with charging aperture 5, ring flange or cuff is adopted to be connected; Wherein the specification of tapered tube 4 and pump line 6 and structure are determined according to the pumping height of simulation and other related test parameters; Optional 125mm or 150mm of pump line 6 internal diameter, pump line 6 can not select the bend pipe being less than 90 °; The volume of concrete sample to be measured is not less than 2/3rds of test barrel 3 volume.
Preferably, thruster 1 is hydraulic pusher or air pressure thruster, electric plating propulsion.
Preferably, stop valve 8 is hydraulic concrete stop valve or concrete air pressure stop valve, concreting machinery stop valve.
A method of testing for High Pressure Reinforced Concrete stability, comprises the following steps:
Step one, provide proving installation as above;
Step 2, air-tight test is carried out to described proving installation: close stop valve 8, in test barrel 3, fill water from charging aperture 5; Then sealed feed inlet 5, starts thruster 1, observes the state of increased pressure sensor 7, if the pressure that pressure transducer 7 shows normally increases, then represents that the impermeability of described proving installation is good; If the unchanged or pressure increase of pressure that pressure transducer 7 shows is lower than normal value, then represents that the hermetic seal of described proving installation is inadequate, need to carry out encapsulation process;
Step 3, test the divergence K of concrete sample to be measured
0, close the stop valve 8 of described proving installation, concrete sample loaded in test barrel 3 through charging aperture 5, closed-type feed mouth 5;
Step 4, startup thruster 1, at the uniform velocity carried the pressure in test barrel 3 to pressure P by piston 2, the duration of this pressure P is t;
Step 5, the pressure P opened in stop valve 8 to test barrel 3 are reduced to atmospheric pressure, and collect the concrete that in pressure reduction, discharging opening is discharged, and test its divergence K
1;
At the uniform velocity residual concrete is discharged, the divergence K of test residual concrete after step 6, pressure release
2;
Step 7, pass through formula
Calculate concrete high pressure pumping stability G
b.
A method of testing for concrete pumping limiting performance, comprises the following steps:
Step one, provide proving installation as above;
Step 2, carry out air-tight test to described proving installation, this air-tight test is described above;
Step 3, close the stop valve 8 of described proving installation, concrete sample to be measured is loaded in test barrel 3 through charging aperture 5, closed-type feed mouth 5;
Step 4, startup thruster 1, at the uniform velocity carried the pressure in test barrel 3 to pressure P by piston 2, the duration of this pressure P is t;
The position of step 5, maintenance piston 2 is fixed, and open stop valve 8 about 2 seconds, the pressure in cylinder 3 to be tested is decreased to atmospheric pressure, closes stop valve 8 after discharge section concrete;
Step 6, repetition step 4 and step 5, until pump line 6 blocks, the number of times J of stop valve 8 now opened in record, then concrete pumping limiting performance J
b=J.
Pressure P in the present invention converts according to concrete pumping height and with reference to " JGJT10-2011 Concrete Pumping Construction technical regulation " and forms; The expansion degree of concrete sample all obtains according to " Standard for test methods of properties of ordinary concrete mixture standard " (GB/T5008) test.
Embodiment 1 ~ 6 carries out high-voltage stability and pumping limit performance test to the concrete sample of different mixture ratio, and each concrete sample match ratio is as shown in table 1.Wherein, embodiment 1-2 is C40 normal concrete; Embodiment 3-4 is C60 high-strength concrete; Embodiment 5-6 is light aggregate concrete, and light-weight aggregate is 800 grades of haydites of book structure, its apparent density 1700kg/m
3.
In embodiment 1 ~ 6, in simulation test, if pumping height is 400m, horizontal pump tube length is 1/3 of vertical pump line, and both are 125mm by diameter, and the concrete intensity of pumping is 2m/s; After then converting, test pressure P is 24MPa; According to construction experience, concrete motion process duration in pumping is about 15min, therefore to get pressure duration t be 15min.
The result recorded by method of testing of the present invention is as shown in table 2.
Concrete mix (kg/m in table 1 embodiment 1 ~ 6
3)
High Pressure Reinforced Concrete stability and pumping limit the performance test results in table 2 embodiment 1 ~ 6
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a proving installation for High Pressure Reinforced Concrete stability and pumping limit performance, is characterized in that, comprises test barrel, tapered tube and pump line, and being installed in test barrel can along test barrel inwall piston in axial sliding, and piston outer face is connected with the thruster of peripheral hardware; Test barrel one end is connected with the heavy caliber end of tapered tube, and the small-caliber end of tapered tube is connected with one end of pump line, and the other end of pump line offers discharging opening, and discharge outlet is installed on stop valve; Described tapered tube offers charging aperture.
2. the proving installation of a kind of High Pressure Reinforced Concrete stability as claimed in claim 1 and pumping limit performance, is characterized in that, be installed on pressure transducer in described pump line.
3. the proving installation of a kind of High Pressure Reinforced Concrete stability as claimed in claim 1 and pumping limit performance, is characterized in that, the dead in line of described test barrel, tapered tube and pump line.
4. the proving installation of a kind of High Pressure Reinforced Concrete stability as claimed in claim 1 and pumping limit performance, is characterized in that, the axes normal of described charging aperture is in the axis of tapered tube.
5. the proving installation of a kind of High Pressure Reinforced Concrete stability as claimed in claim 1 and pumping limit performance, is characterized in that, described thruster is hydraulic pusher or air pressure thruster, electric plating propulsion.
6. the proving installation of a kind of High Pressure Reinforced Concrete stability as claimed in claim 1 and pumping limit performance, it is characterized in that, between test barrel with tapered tube, between tapered tube with pump line, between pump line with stop valve, between tapered tube with charging aperture, adopt ring flange or cuff to be connected.
7. a method of testing for High Pressure Reinforced Concrete stability, is characterized in that, comprises the following steps:
Step one, provide proving installation described in claim 1 ~ 6;
Step 2, air-tight test is carried out to described proving installation;
The expansion degree K of step 3, test concrete sample
0, after closing the stop valve of described proving installation, concrete sample is loaded in test barrel, hermetical testing device;
Step 4, startup thruster, at the uniform velocity carry the pressure in test barrel to pressure P, the duration of this pressure P is t;
Step 5, open stop valve and be reduced to atmospheric pressure to the pressure P in test barrel, collect the concrete that discharging opening is discharged, test its divergence K
1;
At the uniform velocity discharge the residual concrete in test barrel after step 6, pressure release, and test its divergence K
2;
Step 7, pass through formula
Calculate the high pressure pumping stability G of this concrete sample
b.
8. the method for testing of a kind of High Pressure Reinforced Concrete stability as claimed in claim 7, is characterized in that, in step 3, the volume of described concrete sample is not less than 2/3rds of test barrel volume.
9. a method of testing for concrete pumping limiting performance, is characterized in that, comprises the following steps:
Step one, provide proving installation described in claim 1 ~ 6;
Step 2, air-tight test is carried out to described proving installation;
Step 3, close the stop valve of described survey device, concrete sample is loaded in test barrel, airtight described proving installation;
Step 4, startup thruster, at the uniform velocity carry the pressure in test barrel to pressure P, the duration of this pressure P is t;
The position of step 5, maintenance piston is fixed, and open stop valve, the pressure in cylinder to be tested is decreased to atmospheric pressure, and stop valve closed by discharge section concrete;
Step 6, repetition step 4 and step 5, until pump line blocking, the number of times J of stop valve now opened in record, the pumping limit performance J of this concrete sample
b=J.
10. the method for testing of a kind of concrete pumping limiting performance as claimed in claim 9, is characterized in that, in step 3, the volume of described concrete sample is not less than 2/3rds of test barrel volume.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510923307.3A CN105572328B (en) | 2015-12-11 | 2015-12-11 | A kind of test device and method of testing of High Pressure Reinforced Concrete stability and pumping limit performance |
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|---|---|---|---|
| CN201510923307.3A CN105572328B (en) | 2015-12-11 | 2015-12-11 | A kind of test device and method of testing of High Pressure Reinforced Concrete stability and pumping limit performance |
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Cited By (6)
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| CN105628902A (en) * | 2015-12-22 | 2016-06-01 | 上海市建筑科学研究院 | Mortar conveying force measurement tester and testing method |
| CN107505234A (en) * | 2017-07-10 | 2017-12-22 | 中国建材检验认证集团贵州有限公司 | A kind of concrete pumping system safety testing device and method of testing |
| CN109085326A (en) * | 2018-07-26 | 2018-12-25 | 北京工业大学 | A kind of pressure slip pipe instrument device and evaluation method detecting concrete pumpability |
| CN110501137A (en) * | 2019-08-28 | 2019-11-26 | 上海建工集团股份有限公司 | Concrete pumping bend pipe simulation test device and method |
| CN111157705A (en) * | 2020-01-03 | 2020-05-15 | 中广核工程有限公司 | Ultrahigh-pressure prestressed slurry pressure bleeding test method for nuclear island containment |
| 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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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105628902A (en) * | 2015-12-22 | 2016-06-01 | 上海市建筑科学研究院 | Mortar conveying force measurement tester and testing method |
| CN107505234A (en) * | 2017-07-10 | 2017-12-22 | 中国建材检验认证集团贵州有限公司 | A kind of concrete pumping system safety testing device and method of testing |
| CN109085326A (en) * | 2018-07-26 | 2018-12-25 | 北京工业大学 | A kind of pressure slip pipe instrument device and evaluation method detecting concrete pumpability |
| CN109085326B (en) * | 2018-07-26 | 2021-10-26 | 北京工业大学 | Pressure slide tube instrument device for detecting pumpability of concrete and evaluation method |
| CN110501137A (en) * | 2019-08-28 | 2019-11-26 | 上海建工集团股份有限公司 | Concrete pumping bend pipe simulation test device and method |
| CN111157705A (en) * | 2020-01-03 | 2020-05-15 | 中广核工程有限公司 | Ultrahigh-pressure prestressed slurry pressure bleeding test method for nuclear island containment |
| 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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| CN105572328B (en) | 2017-09-29 |
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