CN112798458A - Method for testing loss rate of underwater foundation anti-scour dry-mixed material cement slurry - Google Patents
Method for testing loss rate of underwater foundation anti-scour dry-mixed material cement slurry Download PDFInfo
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- CN112798458A CN112798458A CN202110237083.6A CN202110237083A CN112798458A CN 112798458 A CN112798458 A CN 112798458A CN 202110237083 A CN202110237083 A CN 202110237083A CN 112798458 A CN112798458 A CN 112798458A
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- 239000004568 cement Substances 0.000 title claims abstract description 82
- 239000002002 slurry Substances 0.000 title claims abstract description 50
- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000000463 material Substances 0.000 title claims abstract description 35
- 239000000203 mixture Substances 0.000 claims abstract description 65
- 239000004746 geotextile Substances 0.000 claims abstract description 42
- 238000009991 scouring Methods 0.000 claims abstract description 17
- 239000013505 freshwater Substances 0.000 claims abstract description 11
- 239000013535 sea water Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims description 18
- 238000009736 wetting Methods 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 8
- 239000011440 grout Substances 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000011160 research Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 238000011049 filling Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009958 sewing Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 208000034189 Sclerosis Diseases 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
- G01N3/567—Investigating resistance to wear or abrasion by submitting the specimen to the action of a fluid or of a fluidised material, e.g. cavitation, jet abrasion
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Abstract
The application discloses method for testing loss rate of underwater foundation anti-scour dry-mixed cement slurry, comprising the following steps: preparing an underwater foundation anti-scouring dry mixture; subpackaging the anti-scour dry-mixed material of the underwater foundation into a geotextile bag; placing the geotextile bags into a box body containing seawater or fresh water, and shaking the geotextile bags at certain intervals; after the underwater foundation anti-scouring dry mixture is solidified and hardened, taking out the geotextile bagged underwater foundation anti-scouring dry mixture; and (5) measuring the loss rate of the cement paste in the box body. According to the method, the dry-mixed material cement slurry loss rate detection method is established through the research of the dry-mixed material cement slurry loss rate detection method, the dry-mixed material cement slurry loss rate detection method can be provided for underwater foundation repair and protection of projects such as bridges and offshore wind power, the quality of the dry-mixed material is effectively controlled, and the technical blank in the field is filled.
Description
Technical Field
The application belongs to the technical field of cement concrete materials, and particularly relates to a method for testing the loss rate of an underwater foundation anti-scour dry-mixed material cement slurry.
Background
The dry mixture for preventing underwater foundation scour is prepared by mixing cement, sand and gravel uniformly in a certain proportion on land, filling the mixture into a geotextile bag according to the weight requirement, throwing and filling the geotextile bag into an area with the design requirement, and solidifying and hardening the geotextile bag into a plain concrete block under water to play a role in preventing foundation scour. The bagged dry mixture can adapt to various complex terrains, particularly working conditions of deep water bank protection, bottom protection and the like without filling cofferdams, and the construction process can also reduce impact damage to pile foundation anti-corrosion coatings and anode blocks during construction throwing. The manufacturing process, the hydration hardening principle and the environmental conditions of the bagged dry mixture of the underwater foundation are obviously different from those of common concrete, the dry mixture can be subjected to the erosion of water flow to cause the loss of cement paste before the dry mixture is coagulated and hardened, and a reasonable method is needed to detect the cement paste loss rate of the dry mixture, so that whether the strength of the mixture meets the design requirement of underwater anti-erosion is judged.
When the bagged dry mixture is put into water, the dry mixture can take two effects. On the one hand, the bagged dry mixture is immersed in water, water passes through the permeation process of the geotextile and the dry mixture, and cement of the dry mixture is continuously hydrated and hardened to form strength. In addition on the one hand, at the in-process of the cement hydration sclerosis of dry blend, the dry blend in bags can receive constantly erodeing of rivers, and the fine particle of cement etc. can run off through the hole of geotechnological bag to the intensity development to the dry blend produces and is showing the influence. Therefore, a dry mixture cement slurry loss rate testing method needs to be established to ensure the construction quality of the dry mixture.
Disclosure of Invention
Aiming at the defects or shortcomings of the prior art, the method for testing the loss rate of the underwater foundation anti-scouring dry mixed material cement paste is provided, the method for testing the loss rate of the underwater foundation anti-scouring dry mixed material cement paste is established through the research on the method for testing the loss rate of the dry mixed material cement paste, the method for testing the loss rate of the dry mixed material cement paste can be provided for the underwater foundation repair and protection of projects such as bridges and offshore wind power, the quality of the dry mixed material is effectively controlled, and the technical blank in the field is filled.
In order to solve the technical problem, the application is realized by the following technical scheme:
the application provides a method for testing the loss rate of an underwater foundation anti-scour dry-mixed material cement paste, which comprises the following steps:
preparing an underwater foundation anti-scouring dry mixture;
subpackaging the anti-scour dry-mixed material of the underwater foundation into a geotextile bag;
placing the geotextile bags into a box body containing seawater or fresh water, and shaking the geotextile bags at certain intervals;
after the underwater foundation anti-scouring dry mixture is solidified and hardened, taking out the geotextile bagged underwater foundation anti-scouring dry mixture;
and (5) measuring the loss rate of the cement paste in the box body.
Further, the method for testing the loss rate of the underwater foundation anti-scour dry-mixed cement slurry comprises the following steps of: and filtering the cement slurry lost in the box body by using filter paper, drying the filtered cement slurry, and weighing to obtain the loss of the cement slurry. Among them, the filter paper is preferably a qualitative filter paper.
Further, the method for testing the loss rate of the underwater foundation anti-scour dry-mixed cement slurry comprises the following steps of: calculated according to the following formula:
further, the method for testing the loss rate of the anti-scour dry-mixed cement slurry of the underwater foundation, wherein the geotextile bags are placed in a box body containing seawater or fresh water, and are shaken at intervals, comprises the following steps: this was done at a frequency of shaking the geotextile bags for 1min every 10 min. Wherein the water temperature is controlled to be 20 +/-2 ℃, and the box body can be a plastic or metal box body with the length of 80cm-120cm, the width of 30cm-60cm and the height of 50cm-80 cm.
Further, the method for testing the loss rate of the anti-scour dry-mixed cement slurry of the underwater foundation, wherein the geotextile bags are placed in a box body containing seawater or fresh water, and are shaken at intervals, comprises the following steps: the geotextile bags containing the underwater foundation anti-scour dry blend are submerged by seawater or fresh water. Wherein the immersion or soaking time of the dry mixture is 15-24 h.
Further, the method for testing the loss rate of the anti-scour dry-mixed cement slurry of the underwater foundation further comprises the following steps of, before the geotextile bag is placed in a box body containing seawater or fresh water: and pre-wetting the underwater foundation anti-scouring dry blend in the geotextile bag. The loss rate of cement paste can be reduced through pre-wetting treatment.
Further, the method for testing the loss rate of the underwater foundation anti-scour dry-mixed cement slurry comprises the following steps of: at least two parallel groups are arranged, the cement slurry loss rate of the parallel groups is tested, and the arithmetic mean value of the cement slurry loss rate is taken. For example, 3 geotextile bags can be made in each group. Specifically, if dry mixed materials of 8kg to 20kg are weighed and stirred, the dry mixed materials are respectively filled into 3 geotextile bags and sealed by a manual sewing machine. Wherein the length of the geotextile bag is 50cm-70cm, and the width of the geotextile bag is 30cm-50 cm. Wherein the equivalent aperture of the geotextile bag is 0.05mm-0.30 mm.
Further, the method for testing the loss rate of the underwater foundation anti-scour dry-mixed cement slurry comprises the following steps of: and mixing and stirring the cement, the fine aggregate and the coarse aggregate uniformly according to a certain proportion to obtain the underwater foundation anti-scouring dry blend. Specifically, the environmental temperature in a laboratory is controlled to be 20 +/-2 ℃, cement, fine aggregate and coarse aggregate are placed into a 30L or 60L forced stirrer to be stirred according to the mixing proportion of the dry mixture, and the underwater foundation scour-resistant bagged dry mixture is obtained, wherein the stirring time can be controlled to be 100-150 s.
Further, the method for testing the loss rate of the underwater foundation anti-scouring dry mixed material cement slurry comprises the steps of using common portland cement with the strength not lower than 42.5 as the cement, using river sand or machine-made sand with the fineness modulus of 2.0-3.1 as the fine aggregate, enabling the maximum particle size of the coarse aggregate to be not more than 40mm, enabling the mud content to be 0.3% -1.5% and enabling the mud block content to be 0.1% -1.0%.
Further, according to the method for testing the loss rate of the underwater foundation anti-scour dry-mixed material cement paste, the coarse aggregate is crushed stone with 5mm-31.5mm continuous gradation, the mud content is 0.8%, and the mud block content is 0.3%.
Further, according to the method for testing the loss rate of the underwater foundation anti-scour dry blend cement paste, the coarse aggregate is prepared by two stages of 5mm-16mm and 16mm-31.5mm, wherein the addition ratio of 5mm-16mm graded broken stones and 16mm-31.5mm graded broken stones is 3: 7.
compared with the prior art, the method has the following technical effects:
the testing method is simple, convenient and easy to operate and high in practicability, an underwater foundation anti-scouring dry-mixed material cement slurry loss rate testing method is established through research on a dry-mixed material cement slurry loss rate testing method, the dry-mixed material cement slurry loss rate testing method can be provided for underwater foundation repair and protection of projects such as bridges and offshore wind power, the quality of the dry-mixed material is effectively controlled, and the technical blank in the field is filled.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
(1) Raw material and apparatus of one embodiment of the present application
Cement: strength grade 42.5 portland cement.
② fine aggregate (sand): the medium sand with the fineness modulus of 2.6 contains 0.8 percent of mud and 0.2 percent of mud blocks.
③ coarse aggregate (pebble): 5mm-31.5mm continuous graded broken stone (prepared by two stages of 5mm-16mm and 16mm-31.5mm, the ratio of 5mm-16mm to 16mm-31.5mm is 3: 7), the mud content is 0.8%, and the mud block content is 0.3%.
(200 g/m) produced by new stannless reclaimed water geotechnical material Limited company2And weaving the geotextile, wherein the equivalent aperture of the geotextile is 0.15mm, and manufacturing the geotextile bag with the length of 60cm and the width of 40 cm.
A plastic box with the length of 100cm, the width of 50cm and the height of 60 cm.
Sixthly, 30L of concrete mixer.
Seventhly, a thermometer, qualitative filter paper and a funnel.
(2) Test method of an embodiment of the present application
Temperature control in laboratory
The temperature of the laboratory is controlled at 20 +/-2 ℃.
② mixing the mixture
And respectively adding the weighed cement, sand and stones into a concrete mixer for stirring, wherein the stirring time is controlled to be 120-150 s.
③ packaging the dry mixture: and weighing 10kg of dry blend respectively, filling the dry blend into the geotextile bags respectively, and sealing the geotextile bags by using a manual sewing machine.
Cement paste loss test method adopted in embodiment
The pretreatment method of the bagged dry mixture comprises the following steps: the bagged dry mixture is subjected to pre-wetting treatment for 4 hours and 6 hours, and then is put into a plastic box for a cement slurry loss test and is directly put into a water box for a cement slurry loss test. Spraying water to the bag body once every 5min for pre-wetting treatment, wherein the water spraying time is 20-30 s each time; the bag body is shaken every 10min for 1min after the bag body is placed in a water pool.
Fifth testing of bagged dry mixture
Taking the dry mixture out of the plastic box after the dry mixture is solidified and hardened, filtering the cement slurry lost in the plastic box by adopting a qualitative filter paper funnel, putting the filtered cement slurry into an oven for drying, and weighing to obtain the loss of the cement slurry. The cement slurry loss rate was calculated as follows:
(3) the application provides a dry blend mixing ratio
Materials such as 42.5 ordinary portland cement are adopted to respectively prepare dry mixtures, and the mixing ratio of the dry mixtures is shown in table 1.
TABLE 1 mixture ratio (kg/m)3)
| Numbering | Cement | Sand | Stone |
| A | 200 | 745 | 1075 |
| B | 260 | 729 | 1045 |
In this example, two different dry mixes were prepared according to the above mix ratio a and mix ratio B to prepare for the following determination of the cement slurry loss rate. Wherein the cement dosage in the mixing proportion A is less than the cement slurry dosage in the mixing proportion B.
(4) Test results of cement slurry loss rate
The dry blend cement slurry loss rate test results are shown in table 2.
TABLE 2 Dry blend grout loss test results
| Numbering | Mix ratio numbering | Treatment of dry blends | Cement slurry loss (%) |
| 1 | Mixing ratio A | Put into a plastic box | 11.5 |
| 2 | Mixing ratio A | Pre-wetting for 4 hr, and placing into plastic box | 6.8 |
| 3 | Mixing ratio A | Pre-wetting for 6 hr, and placing into plastic box | 4.1 |
| 4 | Mixing ratio B | Put into a plastic box | 13.7 |
| 5 | Mixing ratio B | Pre-wetting for 4 hr, and placing into plastic box | 7.8 |
| 6 | Mixing ratio B | Pre-wetting for 6 hr, and placing into plastic box | 4.9 |
The test results show that the loss rates of the cement slurries with different mixing ratios are different, and the loss rate (such as mixing ratio B) of the dry mixture cement slurry with larger cement consumption is slightly larger than the loss rate (such as mixing ratio A) of the dry mixture cement slurry with smaller cement consumption; moreover, the pre-wetting treatment can obviously reduce the loss rate of the dry-mixed cement slurry.
According to the method, the dry-mixed material cement slurry loss rate detection method is established through the research of the dry-mixed material cement slurry loss rate detection method, the dry-mixed material cement slurry loss rate detection method can be provided for underwater foundation repair and protection of projects such as bridges and offshore wind power, the quality of the dry-mixed material is effectively controlled, and the technical blank in the field is filled.
The above embodiments are merely to illustrate the technical solutions of the present application and are not limitative, and the present application is described in detail with reference to preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made in the present invention without departing from the spirit and scope of the present invention and shall be covered by the appended claims.
Claims (10)
1. The method for testing the loss rate of the underwater foundation anti-scour dry-mixed cement slurry is characterized by comprising the following steps:
preparing an underwater foundation anti-scouring dry mixture;
subpackaging the anti-scour dry-mixed material of the underwater foundation into a geotextile bag;
placing the geotextile bags into a box body containing seawater or fresh water, and shaking the geotextile bags at certain intervals;
after the underwater foundation anti-scouring dry mixture is solidified and hardened, taking out the geotextile bagged underwater foundation anti-scouring dry mixture;
and (5) measuring the loss rate of the cement paste in the box body.
2. The method for testing the loss rate of the cement slurry of the underwater foundation anti-scour dry mixture according to claim 1, wherein the step of determining the loss rate of the cement slurry in the box body comprises the following steps: and filtering the cement slurry lost in the box body by using filter paper, drying the filtered cement slurry, and weighing to obtain the loss of the cement slurry.
3. The method for testing the loss rate of the cement slurry of the underwater foundation anti-scour dry mixture according to claim 1, wherein the step of determining the loss rate of the cement slurry in the box body comprises the following steps: calculated according to the following formula:
4. the method for testing the grout run-off rate of dry-mixed material on underwater foundation according to any of claims 1 to 3, wherein the steps of placing the geotextile bag into a box containing seawater or fresh water and shaking the geotextile bag at certain intervals comprise: this was done at a frequency of shaking the geotextile bags for 1min every 10 min.
5. The method for testing the dry mix grout run-off rate of an underwater foundation as claimed in any one of claims 1 to 3, wherein before the step of placing the geotextile bag in a tank containing seawater or fresh water, the method further comprises: and pre-wetting the underwater foundation anti-scouring dry blend in the geotextile bag.
6. The method for testing the grout run-off rate of dry-mixed material on underwater foundation according to any of claims 1 to 3, wherein the steps of placing the geotextile bag into a box containing seawater or fresh water and shaking the geotextile bag at certain intervals comprise: the geotextile bags containing the underwater foundation anti-scour dry blend are submerged by seawater or fresh water.
7. The method for testing the grout loss rate of the underwater dry mix of the foundation as claimed in any one of claims 1 to 3, wherein the step of sub-packaging the underwater dry mix of the foundation into the geotextile comprises: at least two parallel groups are arranged; wherein the equivalent aperture of the geotextile bag is 0.05mm-0.30 mm.
8. The method for testing the grout run-off rate of the underwater base anti-scour dry mix according to any one of claims 1 to 3, wherein the method for preparing the underwater base anti-scour dry mix comprises the following steps: and mixing and stirring the cement, the fine aggregate and the coarse aggregate uniformly according to a certain proportion to obtain the underwater foundation anti-scouring dry blend.
9. The method for testing the loss rate of the underwater foundation anti-scour dry-mixed material cement paste according to claim 7, wherein the cement is ordinary portland cement with the strength not lower than 42.5, and the fine aggregate is river sand or machine-made sand with the fineness modulus of 2.0-3.1.
10. The method for testing the loss rate of the underwater foundation anti-scour dry-mixed material cement paste according to claim 8, wherein the coarse aggregate is broken stone with continuous gradation with the maximum grain diameter not greater than 40mm, the mud content is 0.3% -1.5%, and the mud block content is 0.1% -1.0%.
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Cited By (2)
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| CN113700055A (en) * | 2021-08-30 | 2021-11-26 | 江苏坤泽科技股份有限公司 | Test method for simulating erosion of solidified soil in offshore wind power pile construction process |
| CN113700055B (en) * | 2021-08-30 | 2022-04-19 | 江苏坤泽科技股份有限公司 | Test method for simulating erosion of solidified soil in offshore wind power pile construction process |
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