CN112649322B - Test method for testing alkali return resistance of castable - Google Patents
Test method for testing alkali return resistance of castable Download PDFInfo
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- CN112649322B CN112649322B CN202011595956.2A CN202011595956A CN112649322B CN 112649322 B CN112649322 B CN 112649322B CN 202011595956 A CN202011595956 A CN 202011595956A CN 112649322 B CN112649322 B CN 112649322B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
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- 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
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a test method for alkali return resistance of a castable, which is implemented by cooling the castable to below 5 ℃; pouring with cold water below 5 deg.C to form several pouring samples; curing the poured sample for 24 hours with a mold; demolding after curing is finished to form a demolding sample, directly putting the demolding sample into a water tank, and adding water in time to ensure that the depth of the water is constant, wherein the depth of the water is 1/2 to 3/4 of the height of the sample; timing is started from the time when the demoulded sample is placed into the water tank, and then the alkali return condition of the sample is recorded every day; after the start of the alkali return was observed, 3 demolded specimens were taken out from the water tank every other week, and the change in bulk density and strength of the 3 demolded specimens taken out from the water tank was tested. The test method is simple and easy to implement, can visually and quickly observe the time for the castable to start to return alkali and the alkali return condition, and provides reference for material research and development and on-site castable construction.
Description
Technical Field
The invention relates to the field of testing methods for alkali return resistance of castable, in particular to a testing method for alkali return resistance of castable.
Background
For many years, the problems of efflorescence, carbonization, alkaline hydrolysis and the like of unbaked casting materials always exist, and the problems are particularly obvious in refining and petrochemical devices. The occurrence of the reversion is always a difficult point to study, the specific property of the reversion is difficult to predict, and since the occurrence and development of the reversion usually take months or years, an accelerated test method needs to be developed.
In the patent with the patent number of CN 202010531269.8 and the patent name of the test method for the alkali return resistance of the spraying material for the coal mine tunnel, mixed gas of carbon dioxide, oxygen and water is introduced into a test device and kept for 30-100 days, a sample is weighed after the test is finished, and the alkali return resistance of the spraying material is judged through the weight change before and after the test. The patent No. CN206161629U and the patent name "the device for simulating the alkali return of the red mud yard indoors" design a special device for simulating the alkali return of the red mud yard, but the design of the device is also complex.
Disclosure of Invention
The invention aims to provide a test method for testing the alkali return resistance of a castable.
The invention has the innovation point that the method of low-temperature pouring and maintenance is adopted to promote CAH 10 (the most unstable phase) is formed, then the migration rate of alkali metal ions in the castable is accelerated and the migration of the ions to the surface of the castable is promoted by using a water bath method, the time for observing the damage of the castable due to alkali return is shortened to 6 weeks from years, the test method is simple and easy to implement, the time for the castable to start to alkali return and the alkali return condition can be intuitively and quickly observed, and references are provided for material research and development and on-site castable construction.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a test method for testing the alkali return resistance of a castable comprises the following steps:
(1) Cooling the casting material to below 5 ℃;
(2) Pouring the castable by using cold water below 5 ℃ according to the operation flow of GB/T4513.5, forming a plurality of pouring samples after pouring, and ensuring the temperature of the whole pouring process to be below 10 ℃;
(3) Curing the poured sample for 24 hours with a mold;
(4) Demolding to form a demolding sample after curing is finished, directly placing the demolding sample in a water tank, wherein the depth of water is 1/2 to 3/4 of the height of the sample, ensuring that the casting surface of the demolded sample is exposed in the air, and adding water in time to ensure that the depth of the water is unchanged;
(5) Timing is started from the time when the demoulding sample is placed into the water tank, and then the alkali return condition of the demoulding sample is recorded every day; white hair, cracking, peeling;
(6) After the onset of reversion was observed, 3 demolded samples were taken from the water bath every other week, and the change in bulk density and strength of the 3 demolded samples taken from the water bath was tested.
Further, the curing conditions with the mold are 20 +/-1 ℃ in a constant-temperature constant-humidity curing box and curing with the relative humidity not less than 90% or room-temperature laminating curing in a laboratory.
Further, in the step (5), the alkali reversion condition of the sample can be recorded by photographing or/and recording the surface condition of the sample.
Further, the casting material is hydraulic light casting material or hydraulic heavy casting material.
The invention has the beneficial effects that:
1. the method of low-temperature pouring and maintenance is adopted to promote CAH 10 (the most unstable phase) is formed, then the migration rate of alkali metal ions in the castable is accelerated and the migration of the ions to the surface of the castable is promoted by using a water bath method, the time for observing the damage of the castable due to alkali return is shortened to 6 weeks from years, the test method is simple and easy to implement, the time for the castable to start to alkali return and the alkali return condition can be intuitively and quickly observed, and references are provided for material research and development and on-site castable construction.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below.
Example 1: a test method for testing the alkali return resistance of a castable comprises the steps of cooling the castable to 5 ℃; the pouring material is hydraulic light pouring material, the pouring material is poured by cold water at 5 ℃ according to the GB/T4513.5 operation flow, a plurality of pouring samples are formed after pouring, and the temperature of the whole pouring process is guaranteed to be below 10 ℃; curing the poured sample with a mold in a constant-temperature constant-humidity curing box for 24 hours at the curing temperature of 19 ℃ and the relative humidity of 90%; demolding to form a demolding sample after maintenance is finished, directly placing the demolding sample in a water tank, wherein the depth of water is 1/2 of the height of the sample, ensuring that the casting surface of the demolding sample is exposed in the air, and adding water in time to ensure that the depth of the water is unchanged; timing is started from the time when the demoulded sample is placed into the water tank, then the alkali return condition of the sample is recorded every day, and the alkali return condition of the sample, such as white hair, cracking, peeling and the like, is recorded by photographing; after the onset of reversion was observed, 3 demolded samples were taken from the water bath every other week, and the change in bulk density and strength of the 3 demolded samples taken from the water bath was tested.
Example 2: a test method for alkali return resistance of castable comprises the steps of cooling the castable to 3 ℃; the pouring material is hydraulic light pouring material, the pouring material is poured by cold water at 3 ℃ according to the GB/T4513.5 operation flow, a plurality of pouring samples are formed after pouring, and the temperature of the whole pouring process is guaranteed to be below 10 ℃; covering a film on the poured sample with a mold in a laboratory at room temperature for curing for 24 hours; demolding to form a demolding sample after maintenance is finished, directly placing the demolding sample in a water tank, wherein the depth of water is 1/2 of the height of the sample, ensuring that the casting surface of the demolding sample is exposed in the air, and adding water in time to ensure that the depth of the water is unchanged; timing is started from the time when the demoulded sample is placed into the water tank, then the alkali return condition of the sample is recorded every day, and the alkali return condition of the sample, such as white hair, cracking, peeling and the like, is recorded by photographing; after the start of the alkali return was observed, 3 demolded specimens were taken out from the water tank every other week, and the change in bulk density and strength of the 3 demolded specimens taken out from the water tank was tested.
Example 3: a test method for testing the alkali return resistance of a castable comprises the steps of cooling the castable to 3 ℃; the casting material is hydraulic heavy casting material, the casting material is cast by cold water with the temperature of below 3 ℃ according to the operation flow of GB/T4513.5, a plurality of casting samples are formed after casting, and the temperature of the whole casting process is ensured to be below 10 ℃; curing the poured pouring sample in a constant-temperature constant-humidity curing box for 24 hours at the curing temperature of 20 ℃ and the relative humidity of 95 percent by using a belt mold; demolding after the maintenance is finished to obtain a demolding sample, directly placing the demolding sample in a water tank, wherein the depth of water is 3/5 of the height of the sample, exposing the casting surface of the demolding sample in the air, and adding water in time to ensure that the depth of the water is unchanged; timing is started from the time when the demoulded sample is placed into the water tank, then the alkali return condition of the sample is recorded every day, and the alkali return condition of the sample, such as white hair, cracking, peeling and the like, is recorded by recording the surface condition of the sample; after the onset of reversion was observed, 3 demolded samples were taken from the water bath every other week, and the change in bulk density and strength of the 3 demolded samples taken from the water bath was tested.
Example 4: a test method for testing the alkali return resistance of a castable comprises the steps of cooling the castable to 1 ℃; the casting material is hydraulic heavy casting material, the casting material is cast by cold water at 1 ℃ according to the operation flow of GB/T4513.5, a plurality of casting samples are formed after casting, and the temperature in the whole casting process is ensured to be below 10 ℃; curing the belt mold in a constant temperature and humidity curing box for 24 hours at the temperature of 21 ℃ and the relative humidity of 98%; demolding to form a demolding sample after maintenance is finished, directly placing the demolding sample in a water tank, wherein the depth of water is 3/4 of the height of the sample, ensuring that the casting surface of the demolding sample is exposed in the air, and adding water in time to ensure that the depth of the water is unchanged; timing is started from the time when the demoulded sample is placed into the water tank, then the alkali return condition of the sample is recorded every day, and the alkali return condition of the sample, such as white hair, cracking, peeling and the like, is recorded by photographing and recording the surface condition of the sample; after the onset of reversion was observed, 3 demolded samples were taken from the water bath every other week, and the change in bulk density and strength of the 3 demolded samples taken from the water bath was tested.
Table 1 shows the changes in the parameters of examples 1, 2, 3 and 4
The described embodiments are only some embodiments of the invention, 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 invention.
Claims (4)
1. A test method for testing the alkali return resistance of a castable is characterized by comprising the following steps:
(1) Cooling the casting material to below 5 ℃;
(2) Pouring the castable with cold water below 5 ℃ according to the GB/T4513.5 operation flow, forming a plurality of pouring samples after pouring, and ensuring the temperature of the whole pouring process to be below 10 ℃;
(3) Curing the poured sample for 24 hours with a mold;
(4) Demolding to form a demolding sample after curing is finished, directly placing the demolding sample into a water tank, wherein the depth of water is 1/2 to 3/4 of the height of the sample, and adding water in time to ensure that the depth of the water is not changed;
(5) Timing is started from the time when the demoulding sample is placed into the water tank, and then the alkali return condition of the demoulding sample is recorded every day;
(6) After the start of the alkali return was observed, 3 demolded specimens were taken out from the water tank every other week, and the change in bulk density and strength of the 3 demolded specimens taken out from the water tank was tested.
2. The test method for alkali return resistance test of castable according to claim 1, wherein the curing conditions with a mold are 20 ℃ ± 1 ℃ in a constant temperature and humidity curing box, and the relative humidity is not less than 90% for curing or room temperature laminating curing in a laboratory.
3. The castable reversion resistance test method according to claim 1, wherein in the step (5), the reversion condition of the sample can be recorded by photographing or/and recording the surface condition of the sample.
4. The test method for alkali-return resistance of castable according to claim 1, wherein the castable is hydraulic lightweight castable or hydraulic heavy castable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011595956.2A CN112649322B (en) | 2020-12-30 | 2020-12-30 | Test method for testing alkali return resistance of castable |
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| CN202011595956.2A CN112649322B (en) | 2020-12-30 | 2020-12-30 | Test method for testing alkali return resistance of castable |
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| CN112649322A CN112649322A (en) | 2021-04-13 |
| CN112649322B true CN112649322B (en) | 2023-03-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205691585U (en) * | 2016-06-22 | 2016-11-16 | 廊坊立邦涂料有限公司 | A kind of damping alkali burnout resistance assay device |
| CN108129068A (en) * | 2017-12-12 | 2018-06-08 | 朱文杰 | A kind of preparation method of no accumulation of salt in the surface soil floor tile gap filler |
| CN108069690B (en) * | 2018-02-26 | 2020-04-24 | 上海牛元工贸有限公司 | Environment-friendly joint mixture and preparation method thereof |
| CN108314399A (en) * | 2018-03-09 | 2018-07-24 | 深圳摩盾环保新材料有限公司 | A kind of gypsum base preventing the accumulation of salt in the surface soil pours mortar material and preparation method thereof |
| CN108918576A (en) * | 2018-05-15 | 2018-11-30 | 爱尔建材(天津)有限公司 | A kind of test method detecting concrete product accumulation of salt in the surface soil degree |
| CN108795361A (en) * | 2018-07-11 | 2018-11-13 | 佛山陵朝新材料有限公司 | A kind of preparation method of high intensity chemical resistance gap filler |
| CN109557287A (en) * | 2018-11-16 | 2019-04-02 | 天津大学 | A method of test pavement brick alkali burnout resistance |
| CN109651905A (en) * | 2018-12-25 | 2019-04-19 | 浙江厦光涂料有限公司 | A kind of decoration integrated coating of novel bi-component water-proof and its construction method |
| CN110041030A (en) * | 2019-05-21 | 2019-07-23 | 成都建工预筑科技有限公司 | A kind of anti-pollution concrete product and its preparation method and application |
| CN111393116B (en) * | 2020-03-24 | 2021-10-12 | 中国建筑第五工程局有限公司 | Undisturbed shield muck non-fired building material and preparation method thereof |
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