CN114778804B - Method for detecting alkali-activated aggregate of concrete - Google Patents
Method for detecting alkali-activated aggregate of concrete Download PDFInfo
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- CN114778804B CN114778804B CN202210175940.9A CN202210175940A CN114778804B CN 114778804 B CN114778804 B CN 114778804B CN 202210175940 A CN202210175940 A CN 202210175940A CN 114778804 B CN114778804 B CN 114778804B
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- 239000003513 alkali Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000012360 testing method Methods 0.000 claims abstract description 81
- 239000004568 cement Substances 0.000 claims abstract description 37
- 230000000694 effects Effects 0.000 claims abstract description 34
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 23
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 23
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 16
- 150000002191 fatty alcohols Chemical class 0.000 claims description 14
- 238000000465 moulding Methods 0.000 claims description 11
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000002791 soaking Methods 0.000 claims description 8
- 238000005336 cracking Methods 0.000 claims description 3
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims description 2
- 229940082500 cetostearyl alcohol Drugs 0.000 claims description 2
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical group CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 claims description 2
- 239000010453 quartz Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- OULAJFUGPPVRBK-UHFFFAOYSA-N tetratriacontyl alcohol Natural products CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCO OULAJFUGPPVRBK-UHFFFAOYSA-N 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 14
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000000395 magnesium oxide Substances 0.000 abstract description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 abstract description 2
- 230000036632 reaction speed Effects 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- 235000013405 beer Nutrition 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/30—Staining; Impregnating ; Fixation; Dehydration; Multistep processes for preparing samples of tissue, cell or nucleic acid material and the like for analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Immunology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention provides a method for detecting alkali-activated aggregate of concrete, which comprises the steps of mixing aggregate, fatty alcohol-polyoxyethylene ether and cement to prepare a test piece, carrying out ultrasonic treatment, and carrying out test maintenance in a specific temperature and humidity environment, so that the reaction speed of alkali-aggregate can be improved, the reaction process of alkali-aggregate can be accelerated, the alkali activity detection time can be shortened, the activity of non-alkali active components such as magnesium oxide can be inhibited, the interference of expansion caused by the non-alkali active components on a test result can be reduced, and the detection accuracy can be improved.
Description
Technical Field
The invention relates to the technical field of concrete material identification, in particular to a detection method of concrete alkali-activated aggregate.
Background
The alkali-activated aggregate refers to amorphous silicon, quartz with serious stress deformation, certain carbonate aggregates and the like, and can react with alkali substances in cement, additives, admixtures and the like in concrete under certain conditions to cause expansion, cracking and even destruction of a concrete structure, and the durability of the concrete can be directly influenced. Therefore, the detection of the alkali activity of the aggregate has important significance for the selection of the concrete aggregate and the improvement of the concrete performance.
Currently, commonly used alkali-activated aggregate detection methods include a lithofacies method, a mortar length method, a mortar rod rapid method, a rock cylinder method and a concrete prism method, wherein the lithofacies method and the concrete prism method are respectively suitable for primary judgment and identification of all aggregates, the mortar length method, the mortar rod rapid method and the chemical method are only suitable for identification of silicate aggregates, the rock cylinder method is suitable for identification of carbonate aggregates, and the 6 methods have certain limitations. Patent CN202011028156.2 also discloses a method for rapidly identifying alkali-activated aggregate, which comprises grinding aggregate into fine powder, preparing cement paste, and pouring into a glass beer bottle. The method is simple and easy to operate, but if the carbonate aggregate is made into powder, the rock structure of the carbonate aggregate is changed, so that clay minerals of the carbonate aggregate are exposed, the possibility of water absorption expansion of the minerals is lost, the alkali activity of the carbonate aggregate cannot be accurately identified, and whether the aggregate has the alkali activity or not is judged according to whether a glass beer bottle is cracked or not, so that the possibility of misjudgment exists. The method can only perform qualitative initial judgment on silicic acid and silicate aggregate, cannot determine the influence degree of the alkali activity of the aggregate on the concrete, and has low accuracy.
Disclosure of Invention
Accordingly, the invention aims to provide a method for detecting the alkali-activated concrete aggregate, which can rapidly and accurately identify the alkali activity of the concrete aggregate.
The technical scheme of the invention is realized as follows:
the method for detecting the alkali-activated aggregate of the concrete comprises the following steps of:
s1, aggregate treatment: mixing aggregate, water, cement and fatty alcohol polyoxyethylene ether, adjusting the alkali content of the cement to 1.20+/-0.05%, molding and curing after a test piece is molded, and measuring the standard length of the test piece;
s2, detecting alkali activity: soaking the test piece molded and cured in the step S1 by using alkali solution, and placing the test piece in an environment with the temperature of 55-75 ℃ and the relative humidity of 80-90% for test curing; ultrasonic treatment is also carried out in the test maintenance process; the frequency of the treatment is 3-4 d/time;
s3, measuring: and (3) measuring the expansion rate of the curing test piece in the step S2 every 5-7 d in the observation age period, and judging the alkali activity of the aggregate.
Further, the granularity of the aggregate is 10-20 mm.
Further, the mass ratio of the aggregate to the cement is 2.25:1.
Further, the water-cement ratio of the test piece is 0.40-0.45.
Further, the consumption of the fatty alcohol-polyoxyethylene ether is 0.03-0.06% of the mass of the cement; the fatty alcohol polyoxyethylene ether is cetostearyl alcohol polyoxyethylene ether or laurinol polyoxyethylene ether.
And further, the molding curing is to put the test piece together with a die into a standard curing environment with the temperature of 20+/-3 ℃ and the relative humidity of more than 95% for 24 hours+/-4 hours after the test piece is molded, and demolding.
Further, the alkali solution is 1mol/L sodium hydroxide solution.
Further, the power of the ultrasonic treatment is 350-400W, the wavelength is 1.37-1.45 cm, and the time is 5-8 min.
Further, the observation period is 14 to 21d.
Further, the calculation formula of the expansion rate is:
wherein P is the expansion rate of the test piece in the t age, L 0 For the reference length of the test piece, L t The length of the test piece at the t-age.
Further, the standard of the alkali activity is that the expansion rate of the test piece 14d is not less than 0.1%, or the aggregate has potential alkali activity when cracking and bending phenomena occur; if the expansion rate is less than 0.05%, the aggregate is an inactive aggregate; if the expansion rate is between 0.05 and 0.1 percent, the expansion rate is calculated after the age is prolonged to 21d, and judgment is carried out by combining a lithology method.
Compared with the prior art, the invention has the beneficial effects that:
according to the method for detecting the alkali-activated aggregate of the concrete, disclosed by the invention, the aggregate, the fatty alcohol-polyoxyethylene ether and the cement are mixed to prepare the test piece, the ultrasonic treatment is assisted, and the test maintenance is carried out in a specific temperature and humidity environment, so that the reaction speed of the alkali-aggregate can be improved, the reaction process of the alkali-aggregate is accelerated, and the detection time of the alkali activity is shortened; the fatty alcohol-polyoxyethylene ether can also inhibit the activity of non-alkali active ingredients such as magnesium oxide and the like in the test maintenance process, so that the interference of expansion caused by the non-alkali active ingredients on test results is reduced, and the detection accuracy is improved.
The detection method disclosed by the invention is simple to operate, retains the structure of aggregate, can be used for detecting silicon and carbonate aggregates, and is wide in applicability.
Detailed Description
For a clear and complete description of the technical solutions of the present invention, it is apparent that the inventors have described in connection with the embodiments, but that the following embodiments describe only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The method for detecting the alkali-activated aggregate of the concrete comprises the following steps of:
s1, aggregate treatment: mixing aggregate with granularity of 10-20 mm with water, cement and fatty alcohol polyoxyethylene ether, wherein the water-cement ratio is 0.42, the consumption of the fatty alcohol polyoxyethylene ether is 0.04% of the mass of the cement, adjusting the alkali content of the cement to 1.20+/-0.05%, after a test piece is molded, placing the test piece together with a die in a standard curing environment with the temperature of 20+/-3 ℃ and the relative humidity of more than 95%, molding and curing for 24 hours+/-4 hours, demolding, and measuring the standard length of the test piece;
s2, detecting alkali activity: soaking the test piece molded and cured in the step S1 by using 1mol/L sodium hydroxide solution, placing the test piece in an environment with the temperature of 55-75 ℃ and the relative humidity of 80-90% for test curing, and carrying out ultrasonic treatment every 3d in the test curing process; the power of the ultrasonic treatment is 350W, the wavelength is 1.43cm, and the time is 6min;
s3, measuring: and (2) observing for 14-21 d, measuring the expansion rate of the curing test piece in the step S2 every 7d in the observation age, and judging the aggregate alkali activity.
Example 2
The method for detecting the alkali-activated aggregate of the concrete comprises the following steps of:
s1, aggregate treatment: mixing aggregate with granularity of 10-20 mm with water, cement and fatty alcohol polyoxyethylene ether, wherein the water-cement ratio is 0.45, the consumption of the fatty alcohol polyoxyethylene ether is 0.06% of the mass of the cement, adjusting the alkali content of the cement to 1.20+/-0.05%, after a test piece is molded, placing the test piece together with a die in a standard curing environment with the temperature of 20+/-3 ℃ and the relative humidity of more than 95%, molding and curing for 24 hours+/-4 hours, demolding, and measuring the standard length of the test piece;
s2, detecting alkali activity: soaking the test piece molded and cured in the step S1 by using 1mol/L sodium hydroxide solution, placing the test piece in an environment with the temperature of 55-75 ℃ and the relative humidity of 80-90% for test curing, and carrying out ultrasonic treatment every 4d in the test curing process; the power of the ultrasonic treatment is 350W, the wavelength is 1.45cm, and the time is 8min;
s3, measuring: and (2) observing for 14-21 d, measuring the expansion rate of the curing test piece in the step S2 every 7d in the observation age, and judging the aggregate alkali activity.
Example 3
The method for detecting the alkali-activated aggregate of the concrete comprises the following steps of:
s1, aggregate treatment: mixing aggregate with granularity of 10-20 mm with water, cement and fatty alcohol polyoxyethylene ether, wherein the water-cement ratio is 0.40, the consumption of the fatty alcohol polyoxyethylene ether is 0.03% of the mass of the cement, adjusting the alkali content of the cement to 1.20+/-0.05%, after a test piece is molded, placing the test piece together with a die in a standard curing environment with the temperature of 20+/-3 ℃ and the relative humidity of more than 95%, molding and curing for 24 hours+/-4 hours, demolding, and measuring the standard length of the test piece;
s2, detecting alkali activity: soaking the test piece molded and cured in the step S1 by using 1mol/L sodium hydroxide solution, placing the test piece in an environment with the temperature of 55-75 ℃ and the relative humidity of 80-90% for test curing, and carrying out ultrasonic treatment every 3d in the test curing process; the power of the ultrasonic treatment is 400W, the wavelength is 1.37cm, and the time is 5min;
s3, measuring: and (2) observing for 14-21 d, measuring the expansion rate of the curing test piece in the step S2 every 7d in the observation age, and judging the aggregate alkali activity.
Example 4
The method for detecting the alkali-activated aggregate of the concrete comprises the following steps of:
s1, aggregate treatment: mixing aggregate with granularity of 10-20 mm with water, cement and fatty alcohol polyoxyethylene ether, wherein the water-cement ratio is 0.42, the consumption of the fatty alcohol polyoxyethylene ether is 0.04% of the mass of the cement, adjusting the alkali content of the cement to 1.20+/-0.05%, after a test piece is molded, placing the test piece together with a die in a standard curing environment with the temperature of 20+/-3 ℃ and the relative humidity of more than 95%, molding and curing for 24 hours+/-4 hours, demolding, and measuring the standard length of the test piece;
s2, detecting alkali activity: soaking the test piece molded and maintained in the step S1 by using a sodium hydroxide solution with the concentration of 1mol/L, and placing the test piece in an environment with the temperature of 55-75 ℃ and the relative humidity of 80-90% for test maintenance;
s3, measuring: and (2) observing for 14-21 d, measuring the expansion rate of the curing test piece in the step S2 every 7d in the observation age, and judging the aggregate alkali activity.
Example 5
The method for detecting the alkali-activated aggregate of the concrete comprises the following steps of:
s1, aggregate treatment: mixing aggregate with granularity of 10-20 mm with water, cement and fatty alcohol polyoxyethylene ether, wherein the water-cement ratio is 0.42, the consumption of the fatty alcohol polyoxyethylene ether is 0.04% of the mass of the cement, adjusting the alkali content of the cement to 1.20+/-0.05%, after a test piece is molded, placing the test piece together with a die in a standard curing environment with the temperature of 20+/-3 ℃ and the relative humidity of more than 95%, molding and curing for 24 hours+/-4 hours, demolding, and measuring the standard length of the test piece;
s2, detecting alkali activity: soaking the test piece molded and maintained in the step S1 by using 1mol/L sodium hydroxide solution, and placing the test piece in a curing chamber at 38+/-2 ℃ for ultrasonic treatment every 3 d; the power of the ultrasonic treatment is 350W, the wavelength is 1.43cm, and the time is 6min;
s3, measuring: and (2) observing for 14-21 d, measuring the expansion rate of the curing test piece in the step S2 every 7d in the observation age, and judging the aggregate alkali activity.
Example 6
The method for detecting the alkali-activated aggregate of the concrete comprises the following steps of:
s1, aggregate treatment: mixing aggregate with granularity of 10-20 mm with water and cement, adjusting the cement alkali content to 1.20+/-0.05% according to the water-cement ratio of 0.42, placing the mixture in a standard curing environment with the temperature of 20+/-3 ℃ and the relative humidity of more than 95% together for molding and curing for 24 hours+/-4 hours after a test piece is molded, demolding, and measuring the standard length of the test piece;
s2, detecting alkali activity: soaking the test piece molded and cured in the step S1 by using 1mol/L sodium hydroxide solution, placing the test piece in an environment with the temperature of 55-75 ℃ and the relative humidity of 80-90% for test curing, and carrying out ultrasonic treatment every 3d in the test curing process; the power of the ultrasonic treatment is 350W, the wavelength is 1.43cm, and the time is 6min;
s3, measuring: and (2) observing for 14-21 d, measuring the expansion rate of the curing test piece in the step S2 every 7d in the observation age, and judging the aggregate alkali activity.
And (3) detection accuracy evaluation: at the same time of measuring the results in the embodiment, adopting a concrete prism method to test, classifying each group of aggregate by using a lithofacies method, and taking 3 parallel tests, wherein the average value of the results is shown in table 1;
TABLE 1 results of aggregate Activity detection
Note that: the aggregate used in example 1 and examples 4-6 was the same batch of aggregate
As shown by the results in the table, the measurement results of the detection methods of the embodiments 1-3 of the invention are consistent with the measurement results of the concrete prism method, and the alkali activity of the aggregate can be measured only by 14d at the highest speed, and the alkali activities of the carbonate aggregate and the siliceous aggregate can be also detected by the method of the invention, which indicates that the detection method of the invention has short measurement time, can be suitable for the alkali activities of different types of aggregates, and has high accuracy.
Compared with the test results of the embodiment 1, the test results of the embodiment 4-5 show that the measured expansion rate is smaller, so that the detection method of the invention can accelerate the reaction process of alkali-aggregate and shorten the detection time; the test results of example 6 are different from the concrete prism method and are prone to deviation.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The method for detecting the alkali-activated aggregate of the concrete is characterized by comprising the following steps of:
s1, aggregate treatment: mixing aggregate with water, cement and fatty alcohol polyoxyethylene ether, adjusting the alkali content of the cement, molding and curing after a test piece is molded, and measuring the standard length of the test piece;
s2, detecting alkali activity: soaking the test piece molded and cured in the step S1 by using alkali solution, placing the test piece in an environment with the temperature of 55-75 ℃ and the relative humidity of 80-90% for test curing, and carrying out ultrasonic treatment in the test curing process; the frequency of the treatment is 3-4 d/time, the power of the ultrasonic treatment is 350-400W, the wavelength is 1.37-1.45 cm, and the time is 5-8 min;
s3, measuring: and (3) measuring the expansion rate of the curing test piece in the step S2 every 5-7 d in the observation age period, and judging the alkali activity of the aggregate.
2. The method for detecting alkali-activated concrete aggregate according to claim 1, wherein the mass ratio of the aggregate to cement is 2.25:1; the granularity of the aggregate is 10-20 mm.
3. The method for detecting alkali-activated aggregate of concrete according to claim 1, wherein the water-cement ratio of the test piece is 0.40-0.45.
4. The method for detecting the concrete alkali-activated aggregate according to claim 1, wherein the amount of the fatty alcohol-polyoxyethylene ether is 0.03-0.06% of the mass of the cement; the fatty alcohol polyoxyethylene ether is cetostearyl alcohol polyoxyethylene ether or laurinol polyoxyethylene ether.
5. The method for detecting the alkali-activated aggregate of the concrete according to claim 1, wherein the molding curing is to cure the test piece in a standard curing environment with a relative humidity of more than 95% for 24 hours plus or minus 4 hours at 20 ℃ plus or minus 3 ℃ together with a die after molding the test piece, and demolding.
6. The method for detecting alkali-activated aggregate of concrete according to claim 1, wherein the observation age is 14 to 21d.
7. The method for detecting alkali-activated concrete aggregate according to claim 1, wherein the criterion for alkali activity is that the expansion rate of the test piece 14d is equal to or greater than 0.1%, or that the aggregate has potential alkali activity when cracking or bending occurs; if the expansion rate is less than 0.05%, the aggregate is an inactive aggregate; if the expansion rate is between 0.05 and 0.1 percent, the expansion rate is calculated after the age is prolonged to 21d, and judgment is carried out by combining a lithology method.
8. Use of the method for detecting alkali-activated aggregate of concrete according to any one of claims 1 to 7 for detecting alkali activity of aggregate by silicon; the aggregate comprises amorphous silicon, quartz and carbonate aggregates which are subjected to severe stress deformation.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101514982A (en) * | 2009-03-18 | 2009-08-26 | 中国水电顾问集团中南勘测设计研究院 | Method for evaluating effectiveness of measure for inhibiting alkali-silica active reaction of concrete aggregate |
| CN110441503A (en) * | 2019-08-26 | 2019-11-12 | 中交二公局第三工程有限公司 | A kind of Alkali-activity of Concrete Aggregate detection method |
| CN112098583A (en) * | 2020-09-26 | 2020-12-18 | 吉林建筑大学 | Method for rapidly identifying alkali active aggregate |
| CN112390582A (en) * | 2020-12-05 | 2021-02-23 | 郴州中祁工程材料有限公司 | Concrete using recycled concrete aggregate and preparation method thereof |
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- 2022-02-24 CN CN202210175940.9A patent/CN114778804B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101514982A (en) * | 2009-03-18 | 2009-08-26 | 中国水电顾问集团中南勘测设计研究院 | Method for evaluating effectiveness of measure for inhibiting alkali-silica active reaction of concrete aggregate |
| CN110441503A (en) * | 2019-08-26 | 2019-11-12 | 中交二公局第三工程有限公司 | A kind of Alkali-activity of Concrete Aggregate detection method |
| CN112098583A (en) * | 2020-09-26 | 2020-12-18 | 吉林建筑大学 | Method for rapidly identifying alkali active aggregate |
| CN112390582A (en) * | 2020-12-05 | 2021-02-23 | 郴州中祁工程材料有限公司 | Concrete using recycled concrete aggregate and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 中华人民共和国国家经济贸易委员会.《中华人民共和国电力行业标准》.中国电力出版社,2001,第1-71页. * |
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