CN108709978B - Self-compacting concrete self-compacting performance comprehensive tester and testing method thereof - Google Patents
Self-compacting concrete self-compacting performance comprehensive tester and testing method thereof Download PDFInfo
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- 239000011376 self-consolidating concrete Substances 0.000 title claims abstract description 43
- 238000012360 testing method Methods 0.000 title claims abstract description 36
- 239000000203 mixture Substances 0.000 claims abstract description 42
- 239000000463 material Substances 0.000 claims abstract description 26
- 239000004567 concrete Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 5
- 238000005056 compaction Methods 0.000 claims description 37
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000005303 weighing Methods 0.000 claims description 9
- 238000010998 test method Methods 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000009736 wetting Methods 0.000 claims description 2
- 238000005204 segregation Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 3
- 238000006049 ring expansion reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003908 quality control method Methods 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
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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- Analytical Chemistry (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
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- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
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Abstract
The invention relates to a self-compacting concrete self-compacting performance comprehensive tester and a testing method thereof, the method adopts the self-compacting performance comprehensive tester to detect self-compacting concrete mixtures, the detection method comprises the steps of filling a V funnel with the mixtures with certain mass, standing for 10s, opening a valve, enabling the mixtures to sequentially pass through the V funnel and a transverse groove with a reinforcing bar grid, discharging the mixtures into a material receiving container, opening the valve for 40s, stopping material receiving, and evaluating the self-compacting performance of the self-compacting concrete by using the ratio of the mass of the discharged mixtures to the total mass, namely the concrete discharge rate P. The method can comprehensively evaluate the filling property, the clearance passing property and the segregation resistance of the self-compacting concrete through one-time test, and is simple, practical, strong in operability and higher in accuracy compared with the method for evaluating the self-compacting property by adopting a plurality of times of test combinations such as an expansion test, a V funnel test, a J-ring test and the like at present.
Description
Technical Field
The invention belongs to the field of civil engineering, and particularly relates to a test method for comprehensively evaluating self-compaction performance of self-compacting concrete.
Background
Self-compacting concrete is a concrete that has high mobility, homogeneity and stability, need not external force when pouring and vibrate, can flow and be full of the template space under the dead weight effect. The appearance of self-compacting concrete is considered to be the most revolutionary progress in concrete engineering in recent decades, which improves the construction environment of concrete, reduces labor cost and improves construction efficiency.
The self-compaction performance of the self-compaction concrete is mainly reflected in filling performance, clearance passing performance and segregation resistance, is the key for ensuring the pouring quality of the concrete, and how to effectively evaluate the self-compaction performance of the self-compaction concrete is very important for quality control in the preparation and construction processes of the self-compaction concrete. At present, many test evaluation methods are available at home and abroad, such as slump expansion, L-shaped box, U-shaped box, Orimet method, J-ring and V-funnel tests, but in order to comprehensively evaluate the self-compaction performance of the mixture, multiple tests are usually required to evaluate, such as slump expansion and expansion time tests for testing the filling property of the self-compaction concrete mixture, J-ring expansion tests for testing the clearance passing property of the self-compaction concrete mixture, V-funnel tests for testing the segregation resistance of the self-compaction concrete mixture, and the sequence of the tests usually affects the test results. Therefore, it is necessary to develop a testing method for comprehensively evaluating the self-compaction performance of the self-compaction concrete, which can test the self-compaction performance of the self-compaction concrete mixture through one-time test, simplify the complicated operation steps, improve the accuracy of the detection result, and improve the working efficiency.
Disclosure of Invention
The invention aims to provide a test method for comprehensively evaluating the self-compaction performance of self-compacting concrete, which can comprehensively evaluate the self-compaction performance of a self-compacting concrete mixture.
In order to realize the task, the technical scheme provided by the invention is as follows:
the utility model provides a self-compaction concrete self-compaction performance integrated test appearance comprises V funnel, transverse groove, bar grating, material receiving container and bracing piece, wherein: the V-shaped funnel is fixed above one side of the transverse groove, the steel bar grating is vertically arranged in the middle of the transverse groove, and the support rod is fixed at the bottom of the transverse groove; the bottom of the other side of the transverse groove is provided with a material receiving container.
In the invention, the bottom of the V-shaped funnel is connected with the groove through the valve connecting groove.
In the invention, the volume of the V-shaped funnel is 10L, the length of the upper port is 490mm, the width is 65mm, the length of the lower port is 75mm, the width is 65mm, the vertical height of the upper part is 425mm, and the height of the lower part is 150 mm.
In the invention, the length of the transverse groove is 400-600mm, the width is 250-350mm and the height is 100-150mm, the steel bar grid is composed of 5 twisted steel bars with the diameter of 10-16mm and the height of 100-150mm, and the center distance of the steel bars is 45-55 mm.
In the invention, the number of the support rods is four, the two support rods on the left side incline to the left by 30-60 degrees, the vertical heights are both 160-200mm, the length of the material receiving container is 350-450 mm, the width is 200-250mm, and the height is 140-160 mm.
The invention provides a testing method of a self-compacting concrete self-compacting performance comprehensive tester, which comprises the following specific steps:
(1) preparing a self-compacting concrete mixture according to the current standard, and sampling;
(2) wetting self-compacting performance comprehensive tester and material containing barrel, and inner wall of the material containing barrel is not exposedWater, then placing on flat ground, keeping the self-compacting performance comprehensive tester horizontal, confirming whether the lower valve of the V-shaped funnel is closed, and weighing the mass m of the receiving container1；
(3) Placing a material containing barrel with the volume larger than 10L on a scale, peeling, placing the self-compacting concrete mixture obtained in the step (1) in the material containing barrel, uniformly mixing, placing the self-compacting concrete mixture slightly larger than 10L, and weighing the self-compacting concrete mixture with the mass m2Then filling the self-compacting concrete mixture into a V funnel, leveling by a scraper, pouring the rest self-compacting concrete mixture into a containing barrel, and weighing the mass m3Care is taken not to lose the remaining self-compacting concrete mix;
(4) scraping the top surface of the V-shaped funnel to self-compact the concrete mixture, after standing for 10s, opening the valve at the bottom of the V-shaped funnel, simultaneously timing by using a stopwatch, separating a material receiving container after 40s, and weighing the mass m4；
(5) Calculating the discharge rate P of the self-compacting concrete mixture by percent:
in the invention, the specification for comprehensively evaluating the self-compacting performance of the self-compacting concrete is as follows:
(1) when P is more than or equal to 90, evaluating the self-compaction performance grade of the self-compaction concrete mixture as one grade;
(2) when P is more than or equal to 80 and less than 90, evaluating the self-compaction performance grade of the self-compaction concrete mixture as the second grade;
(3) when P is more than or equal to 70 and less than 80, evaluating the self-compacting performance grade of the self-compacting concrete mixture to be three-grade;
(4) and when the P is less than 70, evaluating that the self-compacting concrete mixture does not meet the self-compacting performance requirement.
The invention has the beneficial effects that: the method can comprehensively evaluate the filling property, the clearance passing property and the segregation resistance of the self-compacting concrete through one-time test, and is simple, practical, strong in operability and higher in accuracy compared with the method for evaluating the self-compacting property by adopting a plurality of times of test combinations such as an expansion test, a V funnel test, a J-ring test and the like at present.
Drawings
FIG. 1 is a schematic view of a self-compacting performance comprehensive tester for self-compacting concrete according to the present invention.
Reference numbers in the figures: 1. v funnel, 2, valve, 3, transverse groove, 4, reinforcing bar bars, 5, bracing piece, 6, material receiving container.
Detailed Description
The present invention is further described with reference to the following embodiments and the accompanying drawings, but it should be noted that the following embodiments are preferred examples of the present invention, and do not limit the present invention in any way, and any simple modification and change made to the following embodiments according to the technical scheme of the present invention belong to the protection scope of the technical scheme of the present application.
Example 1: as shown in figure 1, a self-compaction concrete self-compaction performance comprehensive tester comprises a V funnel 1, a transverse groove 3, a reinforcing bar grid 4, a material receiving container 6 and a support rod 5, wherein the V funnel 1 is fixed on the transverse groove 3, the reinforcing bar grid 4 is vertically arranged in the middle of the transverse groove 3, and the support rod 5 is connected with the bottom of the transverse groove 3.
In the invention, the lower end of the V-shaped funnel 1 is provided with a valve 2, the capacity is about 10L, the length of the upper port is 490mm, the width is 65mm, the length of the lower port is 75mm, the width is 65mm, the vertical height of the upper part is 425mm, and the height of the lower part is 150 mm.
The transverse groove 3 is 500mm long, 300mm wide and 100mm high.
The steel bar grid 4 is composed of 5 threaded steel bars with the diameter of 12mm and the height of 100mm, and the center distance of the steel bars is 50 mm.
The number of the support rods 5 is four, two support rods on the left side incline to the left by 30 degrees, and the vertical height is 180 mm.
The volume of the material receiving container 6 is 12L, the length is 400mm, the width is 200mm, and the height is 150 mm.
The method for testing the self-compaction performance of the self-compaction concrete comprises the following specific steps:
(1) taking out a C60 self-compacting concrete mixture sample from the concrete tank truck, wherein the sample is more than 20L;
(2) lubricating deviceThe wet self-compaction performance comprehensive tester comprises a wet self-compaction performance comprehensive tester, a material containing bucket and a material receiving container 6, wherein the inner wall of the material containing bucket is free of open water, and then the material containing bucket is placed on the flat ground, so that the tester is kept horizontal, whether a valve 2 at the lower part of a V-shaped funnel 1 is closed or not is confirmed, and the mass m of the material receiving container 6 is weighed11.585 kg;
(3) placing a material containing barrel with the volume of more than 10L on a scale, peeling, uniformly mixing the self-compacting concrete sample obtained in the step (1), filling the sample with the volume of slightly more than 10L, and weighing the sample with the mass m225.325kg, the V funnel 1 is filled with the sample, the sample is scraped off by a scraper, the rest of the sample is poured back into the storage bucket, and the mass m is weighed31.352kg, taking care not to lose the remaining sample;
(4) scraping off the sample on the top surface of the V-shaped funnel 1, standing for 10s, opening the bottom valve 2, timing with a stopwatch, opening the receiving container 6 after 40s, and weighing the mass m422.856 kg;
(5) calculating the discharge rate P of the self-compacting concrete mixture by percent:
therefore, the self-compaction performance rating of the vehicle C60 self-compaction concrete mix was rated two-stage.
Simultaneously sampling and carrying out a V funnel test, a slump expansion and expansion time test and a J ring expansion test on the C60 self-compacting concrete mixture of the truck according to the current standard, wherein the detection result is that the V funnel passing time is 20.4s, the slump expansion is 720mm, and the expansion time T is5003.6s and the J-ring expansion degree is 705mm, which indicates that the mixture meets the second-level requirement of self-compaction performance, and indicates that the evaluation result of the test method provided by the invention is consistent with the current test standard.
Claims (2)
1. A test method of a self-compacting concrete self-compacting performance comprehensive tester is provided, the self-compacting performance comprehensive tester is composed of a V funnel, a transverse groove, a reinforcing bar grid, a material receiving container and a support rod, wherein: the V-shaped funnel is fixed above one side of the transverse groove, the steel bar grating is vertically arranged in the middle of the transverse groove, and the support rod is fixed at the bottom of the transverse groove; a material receiving container is arranged at the bottom of the other side of the transverse groove; the bottom of the V funnel is connected with a groove through a valve connecting groove, the volume of the V funnel is 10L, the length of an upper port is 490mm, the width is 65mm, the length of a lower port is 75mm, the width is 65mm, the vertical height of an upper portion is 425mm, the height of a lower portion is 150mm, the length of the transverse groove is 400-minus-one 600mm, the width is 250-minus-one 350mm, and the height is 100-plus-150 mm, the steel bar grid consists of 5 deformed steel bars with the diameters of 10-16mm and the heights of 100-minus-one 150mm, the central distance of the steel bars is 45-55mm, the supporting rods are four in total, two left sides are inclined to the left by 30-60 degrees, the vertical heights are 160-plus-one 200mm, the material receiving container is 350-minus-one 450mm, the width is 200-minus-one 250 mm;
the method is characterized in that the method for testing the self-compacting performance comprehensive tester of the self-compacting concrete comprises the following specific steps:
(1) preparing a self-compacting concrete mixture according to the current standard, and sampling;
(2) wetting self-compaction performance comprehensive tester and containing bucket, and the inner wall should have no clear water, then place on even subaerial, make self-compaction performance comprehensive tester keep the level, confirm whether V funnel lower part valve has closed, and call and get material receiving container's quality m1；
(3) Placing a material containing barrel with the volume larger than 10L on a scale, peeling, placing the self-compacting concrete mixture obtained in the step (1) in the material containing barrel, uniformly mixing, placing the self-compacting concrete mixture slightly larger than 10L, and weighing the self-compacting concrete mixture with the mass m2Then filling the self-compacting concrete mixture into a V funnel, leveling by a scraper, pouring the rest self-compacting concrete mixture into a containing barrel, and weighing the mass m3Care is taken not to lose the remaining self-compacting concrete mix;
(4) scraping the top surface of the V-shaped funnel to self-compact the concrete mixture, after standing for 10s, opening the valve at the bottom of the V-shaped funnel, simultaneously timing by using a stopwatch, separating a material receiving container after 40s, and weighing the mass m4；
(5) Calculating the discharge rate P of the self-compacting concrete mixture by percent:
2. the testing method of the self-compacting concrete self-compacting performance comprehensive tester as claimed in claim 1, wherein the specification for comprehensive evaluation of self-compacting concrete self-compacting performance is as follows:
(1) when P is more than or equal to 90, evaluating the self-compaction performance grade of the self-compaction concrete mixture as one grade;
(2) when P is more than or equal to 80 and less than 90, evaluating the self-compaction performance grade of the self-compaction concrete mixture as the second grade;
(3) when P is more than or equal to 70 and less than 80, evaluating the self-compacting performance grade of the self-compacting concrete mixture to be three-grade;
(4) and when the P is less than 70, evaluating that the self-compacting concrete mixture does not meet the self-compacting performance requirement.
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| CN109358183A (en) * | 2018-12-04 | 2019-02-19 | 毕节远大新型环保建材（集团）有限责任公司 | A kind of self-compacting concrete self-compacting ability comprehensive tester and its test method |
| CN110672455B (en) * | 2019-10-21 | 2022-09-30 | 武汉美好绿色建筑科技有限公司 | Self-compacting concrete homogeneity testing device and method |
| CN112611855B (en) * | 2020-11-16 | 2022-03-29 | 清华大学 | Self-compacting concrete working performance testing device and testing method |
| CN116289353B (en) * | 2023-03-02 | 2023-12-19 | 江苏科技大学 | Device for reducing filling layer self-compaction concrete filling segregation degree and operation method |
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