CN111537384B - Method for determining hydration degree of gypsum rock - Google Patents
Method for determining hydration degree of gypsum rock Download PDFInfo
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- CN111537384B CN111537384B CN202010314960.0A CN202010314960A CN111537384B CN 111537384 B CN111537384 B CN 111537384B CN 202010314960 A CN202010314960 A CN 202010314960A CN 111537384 B CN111537384 B CN 111537384B
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- gypsum
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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
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
Abstract
The invention discloses a method for determining hydration degree of gypsum rock, which comprises the following steps: the method comprises the following steps: preparing a mixed powder sample by adopting pure anhydrite and pure gypsum, and preparing a plurality of groups of gypsum-anhydrite proportioning samples according to a proportion; step two: preparing a mixed powder sample by adopting pure gypsum, dolomite and calcite, and preparing a plurality of groups of gypsum-dolomite-calcite proportioning samples according to the proportion; step three: carrying out thermogravimetric analysis on the prepared gypsum-anhydrite proportioning sample and the gypsum-dolomite-calcite proportioning sample; step four: establishing a hydration degree judgment standard plate and a hydration type judgment table; step five: and carrying out thermogravimetric analysis on the sample to be evaluated, and comparing the thermogravimetric analysis with a standard chart to determine the hydration degree. The method is based on thermogravimetric analysis, measures the hydration degree of the gypsum rock, evaluates the expansion potential of the gypsum rock, and has important guiding significance for guaranteeing the safety of engineering design.
Description
Technical Field
The invention relates to the field of engineering geological exploration, in particular to a method for determining the hydration degree of gypsum rock.
Background
In the north China and the south China, special rock strata such as gypsum rock, hard gypsum rock, carbonate rock containing paste salt, paste-soluble breccia rock, mud rock containing paste and the like are widely distributed, and have special engineering characteristics, particularly expansibility. The hydrated swelling of anhydrite in gypsum rock is the main cause of swelling of gypsum-containing rock. Engineering diseases caused by expansion of gypsum-containing rock occur, such as Kunlin Baijialing tunnel, hubei Enshi cross bealock tunnel, shanxi Changzhi Du Gongling tunnel, wari railway south Lu Liang mountain tunnel and the like, gypsum rock is disclosed in the tunnels, and the phenomena of road (rail) surface arching deformation, two-lining side walls, arch wall cracks, construction joint water seepage, local ditch side wall concrete softening and the like occur successively after the operation is finished. If anhydrite is completely hydrated to gypsum, the expansion is greatly reduced, and the degree of hydration of the gypsum rock determines the magnitude of the expansion potential.
At present, in the research of the expansibility of plaster-containing rocks, the result of an expansibility test has great discreteness, on one hand, because the anhydrite in the plaster-containing rocks is slowly hydrated, the hydration usually takes years under natural conditions, and the anhydrite is far from being completely hydrated and releasing expansibility in the test process of a conventional method; on the other hand, the nature of the sample itself is unknown, i.e., the degree of hydration of the sample is not known. The evaluation of expansion properties of gypsum-containing rocks according to the current standard methods is extremely unscientific.
Disclosure of Invention
The invention aims to provide a method for determining the hydration degree of gypsum rock, which is used for determining the hydration degree of gypsum rock and evaluating the expansion potential of the gypsum rock based on thermogravimetric analysis and has important guiding significance for guaranteeing the safety of engineering design.
In order to achieve the purpose, the specific technical scheme of the method for determining the hydration degree of the gypsum rock is as follows:
a method for determining the hydration degree of gypsum rock comprises the following steps:
the method comprises the following steps: preparing a mixed powder sample by adopting pure anhydrite and pure gypsum, and preparing a plurality of groups of gypsum-anhydrite proportioning samples according to a proportion;
step two: preparing a mixed powder sample by adopting pure gypsum, dolomite and calcite, and preparing a plurality of groups of gypsum-dolomite-calcite proportioning samples according to the proportion;
step three: carrying out thermogravimetric analysis on the prepared gypsum-anhydrite proportioning sample and the gypsum-dolomite-calcite proportioning sample;
step four: establishing a hydration degree judgment standard plate and a hydration type judgment table;
step five: and carrying out thermogravimetric analysis on the sample to be evaluated, and comparing the thermogravimetric analysis with a standard chart to determine the hydration degree.
The method for determining the hydration degree of the gypsum rock has the advantages that:
1) The expansion potential of the gypsum-containing rock is determined according to the hydration degree of the gypsum-containing rock, and the gypsum and the anhydrite can be distinguished according to the characteristic that the gypsum and the anhydrite have different weight loss rates due to different physical properties in the continuous temperature-increasing environment;
2) On the basis of thermogravimetric analysis, the hydration degree of the gypsum rock is determined, the expansion potential of the gypsum rock is evaluated, and the method has important guiding significance for guaranteeing the safety of engineering design.
Drawings
FIG. 1 is a thermogravimetric plot of the gypsum-anhydrite ratio of the present invention;
FIG. 2 is a thermogravimetric plot of the gypsum-dolomite-calcite ratio of the present invention;
FIG. 3a is an example of gypsum hydration level determination in comparison to FIG. 1 in the present invention;
FIG. 3b is an example of gypsum hydration level determination in the present invention compared to FIG. 2;
FIG. 4 is a flow chart of the method for determining the hydration level of gypsum rock of the present invention.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, the method for determining hydration level of gypsum rock of the present invention is further described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 4, which illustrate a method for determining hydration level of gypsum rock according to the present invention, a suitable determination standard chart and a determination table are obtained according to a sample with a known concentration or ratio and a known hydration level, then thermogravimetric analysis is performed on the sample to be measured, and the obtained analysis result is compared with the determination standard chart and the determination table, so as to obtain a hydration level result of the sample.
The invention discloses a method for determining hydration degree of gypsum rock, which comprises the following steps:
step one S101, 100 percent of pure anhydrite and 100 percent of pure gypsum are adopted to prepare mixed powder samples, and a plurality of groups of gypsum-anhydrite mixture samples are prepared according to the proportion.
And step S102, preparing a mixed powder sample by adopting 100% pure gypsum, dolomite and calcite, and preparing a plurality of groups of gypsum-dolomite-calcite proportioning samples according to the proportion.
And step three S103, carrying out thermogravimetric analysis on the prepared gypsum-anhydrite matching sample and the gypsum-dolomite-calcite matching sample.
And step four S104, establishing a hydration degree judgment standard plate and a hydration type judgment table.
And step five S105, performing thermogravimetric analysis on the sample to be evaluated, comparing the thermogravimetric analysis with a standard chart, and determining the hydration degree.
Specifically, in the first step, 100% pure anhydrite and 100% pure gypsum are adopted to prepare mixed powder samples, the contents of the 100% pure gypsum and the 100% pure anhydrite are respectively proportioned according to different proportions, a plurality of groups of gypsum-anhydrite proportioning samples are prepared according to proportions, and after proportioning, the gypsum-anhydrite proportioning samples are fully and uniformly stirred, so that six groups of gypsum-anhydrite proportioning samples are respectively prepared.
Wherein, the content of the gypsum in the six groups of gypsum-anhydrite matching samples is 0 percent, 20 percent, 40 percent, 60 percent, 80 percent and 100 percent; the content of anhydrite corresponds to 100%, 80%, 60%, 40%, 20%, 0%, respectively. The specific proportioning scheme is shown in table 1.
TABLE 1 Gypsum and anhydrite mixing ratio sample table
And secondly, preparing a mixed powder sample by adopting 100% of pure gypsum, dolomite and calcite, subpackaging the mixed powder sample according to the content of the 100% of pure gypsum, the dolomite and the calcite, preparing a pure gypsum-dolomite-calcite mixture sample, fully and uniformly stirring after the mixture is prepared, and preparing five groups of gypsum-dolomite-calcite mixture samples.
Wherein, the gypsum content in the five groups of gypsum-dolomite-calcite mixture samples is 40%, 60% and 80%; the content of dolomite is 40%, 30%, 40%, 20% and 20% respectively; the content of calcite is respectively 20%, 30%, 0%, 20% and 0%. The specific proportioning scheme is shown in table 2.
TABLE 2 Gypsum, dolomite and calcite sample proportioning table
| Serial number | Gypsum content (%) | Content of Dolomite (%) | Calcite content (%) |
| Ratio I | 40 | 40 | 20 |
| Formulation II | 40 | 30 | 30 |
| Ratio III | 60 | 40 | 0 |
| Ratio IV | 60 | 20 | 20 |
| Ratio V | 80 | 20 | 0 |
And thirdly, carrying out thermogravimetric analysis on the prepared multiple groups of gypsum-anhydrite matching samples and multiple groups of gypsum-dolomite-calcite matching samples.
Thermogravimetric analysis was performed on six groups of gypsum-anhydrite matched samples in S101 and five groups of gypsum-dolomite-calcite matched samples in S102. Wherein the heating temperature is 1300 ℃.
And step four, establishing a hydration degree judgment standard plate and a hydration type distinguishing table according to the gypsum-anhydrite matching sample and the gypsum-dolomite-calcite matching sample.
And (3) finishing thermogravimetric test data curves of the gypsum-anhydrite mixture sample in the S101 and the gypsum-dolomite-calcite mixture sample in the S102 into standard plates as shown in figures 1 and 2, and establishing a hydration type discrimination table as shown in a table 3.
TABLE 3 hydration type Table
| Type of hydration | Gypsum content (%) | Anhydrite content (%) | Hydration ratio interval (%) |
| Is not hydrated | 0 | 100 | 0 |
| Is slightly hydrated | 0-20 | 80-100 | 0-20 |
| Moderate hydration | 20-40 | 60-80 | 20-40 |
| Micro strong hydration | 40-60 | 40-60 | 40-60 |
| Moderate to strong hydration | 60-80 | 20-40 | 60-80 |
| Very strong hydration | 80-100 | 0-20 | 80-100 |
| Is completely hydrated | 100 | 0 | 100 |
And fifthly, performing thermogravimetric analysis on the sample to be evaluated, comparing the thermogravimetric analysis with a standard chart, and determining the hydration degree.
The results of the thermogravimetric tests of the samples to be evaluated are compared with the standard panels (fig. 1 and 2), the percentage of gypsum content is mainly compared, and the average is taken. The sample was determined to have hydrated by about 65% by this method and the type of hydration was determined to be moderately strong according to table 3.
According to the method for determining the hydration degree of the gypsum rock, the expansion potential of the gypsum-containing rock is determined according to the hydration degree, and the gypsum, the gypsum and the hydrated gypsum can be distinguished according to the characteristic that the gypsum and the hydrated gypsum have different weight loss rates due to different physical properties in a continuous temperature-increasing environment; and on the basis of thermogravimetric analysis, the hydration degree of the gypsum rock is determined, the expansion potential of the gypsum rock is evaluated, and the method has important guiding significance for guaranteeing the safety of engineering design.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.
Claims (4)
1. A method for determining the hydration degree of gypsum rock is characterized by comprising the following steps:
the method comprises the following steps: preparing a mixed powder sample by adopting pure anhydrite and pure gypsum, and preparing a plurality of groups of gypsum-anhydrite proportioning samples according to a proportion;
step two: preparing a mixed powder sample by adopting pure gypsum, dolomite and calcite, and preparing a plurality of groups of gypsum-dolomite-calcite proportioning samples according to the proportion;
step three: carrying out thermogravimetric analysis on the prepared gypsum-anhydrite proportioning sample and the gypsum-dolomite-calcite proportioning sample;
step four: establishing a hydration degree judgment standard plate and a hydration type judgment table, wherein the hydration type judgment table is as follows:
Step five: performing thermogravimetric analysis on the sample to be evaluated, comparing the thermogravimetric analysis with a standard chart, and determining the hydration degree; comparing the thermogravimetric test result of the sample to be evaluated with a standard chart, comparing the gypsum content percentage, and taking the average value; determining the hydration proportion of the sample by the method, and determining the hydration type according to the hydration type discrimination table; the expansion potential of gypsum-containing rock is determined by its degree of hydration, and if anhydrite is completely hydrated to gypsum, its expandability is reduced.
2. The method of claim 1, wherein in step one: preparing a mixed powder sample by adopting pure anhydrite and pure gypsum according to a proportion to prepare six groups of gypsum and anhydrite proportioning samples, wherein: the content of the gypsum in the six groups of gypsum-anhydrite mixture samples is 0 percent, 20 percent, 40 percent, 60 percent, 80 percent and 100 percent; the content of anhydrite corresponds to 100%, 80%, 60%, 40%, 20% and 0%, respectively.
3. The determination method according to claim 1, characterized in that in step two: preparing a mixed powder sample by adopting pure gypsum, dolomite and calcite according to the proportion to prepare five groups of gypsum-dolomite-calcite proportioning samples; wherein, the content of the gypsum in the gypsum-dolomite-calcite mixture sample is 40%, 60% and 80%; the content of dolomite is 40%, 30%, 40%, 20% and 20% respectively; the content of calcite is respectively 20%, 30%, 0%, 20% and 0%.
4. The determination method according to claim 1, characterized in that in step three: the heating temperature for thermogravimetric analysis of the prepared multiple groups of gypsum-anhydrite matching samples and multiple groups of gypsum-dolomite-calcite matching samples is 1300 ℃.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2355286A1 (en) * | 1976-06-18 | 1978-01-13 | Anvar | Analysis of phases present in a plaster - by heating and weighing the plaster at fixed conditions of temp. and water vapour pressure |
| CN101514981A (en) * | 2008-02-21 | 2009-08-26 | 北新集团建材股份有限公司 | Method for rapidly analyzing phase composition of building gypsum powder |
| CN106885753A (en) * | 2017-03-24 | 2017-06-23 | 中国建筑材料科学研究总院 | The method that minusing determines periclase degree of hydration in cement |
| CN106885752A (en) * | 2017-03-24 | 2017-06-23 | 中国建筑材料科学研究总院 | The assay method of periclase weight/mass percentage composition in cement |
| CN106908343A (en) * | 2017-03-24 | 2017-06-30 | 中国建筑材料科学研究总院 | The assay method of periclase degree of hydration in cement |
| CN107941645A (en) * | 2017-12-15 | 2018-04-20 | 东南大学 | A kind of method for measuring each substance reaction degree in flyash, silicon ash, cement three-phase composite system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271312B (en) * | 2017-07-15 | 2019-06-21 | 中国烟草总公司郑州烟草研究院 | A method of based on stem content in thermoanalysis technology measurement pipe tobacco |
| CN108827819A (en) * | 2018-04-09 | 2018-11-16 | 广东电网有限责任公司 | A kind of silicon rubber glue based on regression analysis contains amount determination operation |
| CN110702556A (en) * | 2019-09-03 | 2020-01-17 | 天津力神电池股份有限公司 | Method for detecting content of silicon-based material in silicon-containing negative plate of lithium ion battery |
-
2020
- 2020-04-24 CN CN202010314960.0A patent/CN111537384B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2355286A1 (en) * | 1976-06-18 | 1978-01-13 | Anvar | Analysis of phases present in a plaster - by heating and weighing the plaster at fixed conditions of temp. and water vapour pressure |
| CN101514981A (en) * | 2008-02-21 | 2009-08-26 | 北新集团建材股份有限公司 | Method for rapidly analyzing phase composition of building gypsum powder |
| CN106885753A (en) * | 2017-03-24 | 2017-06-23 | 中国建筑材料科学研究总院 | The method that minusing determines periclase degree of hydration in cement |
| CN106885752A (en) * | 2017-03-24 | 2017-06-23 | 中国建筑材料科学研究总院 | The assay method of periclase weight/mass percentage composition in cement |
| CN106908343A (en) * | 2017-03-24 | 2017-06-30 | 中国建筑材料科学研究总院 | The assay method of periclase degree of hydration in cement |
| CN107941645A (en) * | 2017-12-15 | 2018-04-20 | 东南大学 | A kind of method for measuring each substance reaction degree in flyash, silicon ash, cement three-phase composite system |
Non-Patent Citations (1)
| Title |
|---|
| 石膏质岩工程地质特性及其对隧道混凝土结构危害机制研究;吴银亮;《中国博士学位论文全文数据库 工程科技II辑》;20140415(第4期);第13页第3段、第16-17页第2.2.4节，表2-8 * |
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