CN109100265B - Rapid inspection method for fine aggregate entering field - Google Patents
Rapid inspection method for fine aggregate entering field Download PDFInfo
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- CN109100265B CN109100265B CN201810994268.XA CN201810994268A CN109100265B CN 109100265 B CN109100265 B CN 109100265B CN 201810994268 A CN201810994268 A CN 201810994268A CN 109100265 B CN109100265 B CN 109100265B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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- General Health & Medical Sciences (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention provides a method for rapidly inspecting the entrance of fine aggregate, belonging to the field of concrete. The method comprises the following steps: mixing cement, fine aggregate to be detected, an additive and water to obtain mortar; and (3) filling the mortar into a vertical test mold within 30 seconds, scraping the top end to obtain a test mold to be tested, lifting the test mold to be tested within 1-3 seconds, measuring the expansion degree of the mortar when the mortar in the test mold to be tested stops flowing or is 30 seconds, if the expansion degree of the mortar is not less than 180mm, detecting the fine aggregate to be tested to be qualified, and enabling the fine aggregate to enter the field, and if the expansion degree of the mortar is less than 180mm, detecting the fine aggregate to be tested to be unqualified, and not enabling the fine aggregate to enter the field. The invention provides a new fine aggregate entering fast inspection method, which can quickly inspect the performance of fine aggregates and meet the requirements of concrete production.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a method for rapidly inspecting the entrance of fine aggregate.
Background
The continuous development of economy drives the rapid development of the construction industry, and the demand of concrete as one of the most used building materials in modern construction engineering is rapidly increased in various buildings.
Along with the shortage of river sand resources, the variety of the concrete fine aggregate is more and more, the quality fluctuation is larger and larger, the quality is uneven, and the conventional detected qualified raw materials can still not meet the production requirements in production and use. In the prior art, the fine aggregate needs to be subjected to conventional detection on appearance, sieve analysis, firmness, fineness modulus, mud content, mud block content, harmful substance content, alkali activity and the like when entering a field, and meanwhile, the detection steps are complex and the detection time is long.
Disclosure of Invention
In view of this, the present invention provides a method for rapidly inspecting fine aggregate entering a field. The inspection method provided by the invention is rapid, and the qualified fine aggregate can meet the production requirements.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a method for rapidly inspecting the entrance of fine aggregate, which comprises the following steps:
mixing cement, fine aggregate to be detected, an additive and water to obtain mortar;
and scraping the top end of the mortar after the mortar is filled into a vertical test mold within 30 seconds to obtain a test mold to be tested, lifting the test mold to be tested within 1-3 seconds, measuring the spreading degree of the mortar when the mortar in the test mold to be tested stops flowing when the time required by the mortar in the test mold to be tested to stop flowing is less than 30 seconds, measuring the spreading degree of the mortar after the test mold to be tested is lifted 30 seconds when the time required by the mortar in the test mold to be tested to stop flowing is not less than 30 seconds, and if the spreading degree of the mortar is not less than 180mm, detecting the fine aggregate to be tested to be qualified and entering the field, and if the spreading degree of the mortar is less than 180mm, detecting the fine aggregate to be tested to be unqualified and failing to enter the field.
Preferably, the mixing is performed in accordance with a mixing sequence of standard cement mortar.
Preferably, the admixture is a polycarboxylic acid admixture.
Preferably, the vertical trial mold is fixed with a glass plate.
Preferably, the vertical jig is a vertical jig for measuring initial setting time.
The invention provides a method for rapidly inspecting the entrance of fine aggregate, which comprises the following steps: mixing cement, fine aggregate to be detected, an additive and water to obtain mortar; and scraping the top end of the mortar after the mortar is filled into a vertical test mold within 30 seconds to obtain a test mold to be tested, lifting the test mold to be tested within 1-3 seconds, measuring the spreading degree of the mortar when the mortar in the test mold to be tested stops flowing when the time required by the mortar in the test mold to be tested to stop flowing is less than 30 seconds, measuring the spreading degree of the mortar after the test mold to be tested is lifted 30 seconds when the time required by the mortar in the test mold to be tested to stop flowing is not less than 30 seconds, and if the spreading degree of the mortar is not less than 180mm, detecting the fine aggregate to be tested to be qualified and entering the field, and if the spreading degree of the mortar is less than 180mm, detecting the fine aggregate to be tested to be unqualified and failing to enter the field. The invention provides a new fine aggregate approach quick inspection method, which can quickly inspect the performance of fine aggregates and meet the requirements of concrete production. The method can be used for detecting qualified fine aggregate, eliminating the hidden danger of weathered change, avoiding the adsorption of liquid in concrete, and improving the workability and durability. The fine aggregate qualified by the method can better meet the working requirement of concrete, reduce the quality hidden trouble and reduce the cost. And the new problems of increasingly poor quality of fine aggregates, secondary filling of various sand sources, weathering, chemical pollution and the like are avoided.
Detailed Description
The invention provides a method for rapidly inspecting the entrance of fine aggregate, which comprises the following steps:
mixing cement, fine aggregate to be detected, an additive and water to obtain mortar;
and scraping the top end of the mortar after the mortar is filled into a vertical test mold within 30 seconds to obtain a test mold to be tested, lifting the test mold to be tested within 1-3 seconds, measuring the spreading degree of the mortar when the mortar in the test mold to be tested stops flowing when the time required by the mortar in the test mold to be tested to stop flowing is less than 30 seconds, measuring the spreading degree of the mortar after the test mold to be tested is lifted 30 seconds when the time required by the mortar in the test mold to be tested to stop flowing is not less than 30 seconds, and if the spreading degree of the mortar is not less than 180mm, detecting the fine aggregate to be tested to be qualified and entering the field, and if the spreading degree of the mortar is less than 180mm, detecting the fine aggregate to be tested to be unqualified and failing to enter the field.
The cement, the fine aggregate to be detected, the additive and water are mixed to obtain the mortar. The dosage of the fine aggregate, the admixture and the water to be detected in the invention is confirmed according to the mixing ratio used by a specific using unit, and the mixing ratio of each area and each enterprise is different. In the present invention, the mass ratio of the cement, the fine aggregate to be detected, the admixture, and water is preferably 390: 800: 7.8: 168. in the present invention, the mixing is preferably performed in the order of stirring of standard cement mortar. In the embodiment of the present invention, it is particularly preferable that: and stirring the cement, the additive and the water by using a cement mortar stirrer to be in a uniform state, uniformly adding the fine aggregate to be detected at the beginning of the second 30s after stirring for 30s, and then stirring at a high speed for 30 s. Stopping stirring for 90s, and scraping the blade and the mortar on the pot wall into the middle of the pot of the cement mortar stirrer by using a scraper in the first 15 s. Stirring was continued at high speed for 60 s. The time error of each stirring stage is within +/-1 s.
In the present invention, the admixture is preferably a polycarboxylic acid admixture. The sources of the cement, the fine aggregate to be tested and the admixture are not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used.
After the mortar is obtained, the mortar is placed in a vertical test mold within 30 seconds and then the top end of the vertical test mold is scraped to obtain a test mold to be tested, the test mold to be tested is lifted within 1-3 seconds, the spreading degree of the mortar is measured, when the time required for stopping the flow of the mortar in the test mold to be tested is less than 30 seconds, the spreading degree of the mortar in the test mold to be tested is measured when the flow of the mortar in the test mold to be tested is stopped, when the time required for stopping the flow of the mortar in the test mold to be tested is not less than 30 seconds, the spreading degree of the mortar is measured 30 seconds after the test mold to be tested is lifted, if the spreading degree of the mortar is not less than 180mm, the fine aggregate to be tested is qualified for detection and can enter the field, and if the spreading degree of the mortar is less than 180mm, the fine aggregate to be tested is unqualified and cannot enter the field.
In the present invention, the vertical jig is preferably fixed by a glass plate.
In the present invention, the vertical jig is preferably a vertical jig for measuring initial setting time.
In order to further illustrate the present invention, the method for rapidly inspecting fine aggregate entering field provided by the present invention is described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1:
the first step is as follows: because the admixture has a great influence on the fluidity of the concrete, the dosage of the admixture is determined firstly in order to verify whether the proportion of the removed coarse aggregate meets the requirement.
390g of cement, 800g of sand with each index meeting the use requirement of enterprises, 7.8g of the initial dosage of the admixture and 168g of water.
The cement, the admixture and water were mixed and stirred with a cement mortar mixer to a uniform state, after stirring for 30 seconds, sand was uniformly added while the second 30 seconds was started, and then stirred at high speed for 30 seconds. Stopping stirring for 90s, and scraping the blade and the mortar on the pot wall into the middle of the pot of the cement mortar stirrer by using a scraper in the first 15 s. Stirring was continued at high speed for 60 s. The time error of each stirring stage is within +/-1 s.
And (3) after the stirring is finished, putting the glass plate into a vertical test mold for measuring the initial setting time in the middle of the glass plate within 30 seconds, leveling the top end, quickly lifting the test mold within 1-3 seconds, and measuring the expansion degree of the mortar when the mortar stops flowing or 30 seconds. If the expansion degree is within the range of 180 +/-10 mm, the additive is used in a proper amount; if the additive content exceeds the range of 180 +/-10 mm, the additive content needs to be adjusted to the range.
The second step is that: testing the fine aggregate to be tested
Weighing materials: 390g of cement, 800g of fine aggregate (sand) to be detected, 7.8g of admixture (or weight adjusted in the first step), 168g of water.
The cement, the admixture and water were mixed and stirred with a cement mortar mixer to a uniform state, after stirring for 30 seconds, sand was uniformly added while the second 30 seconds was started, and then stirred at high speed for 30 seconds. Stopping stirring for 90s, and scraping the blade and the mortar on the pot wall into the middle of the pot of the cement mortar stirrer by using a scraper in the first 15 s. Stirring was continued at high speed for 60 s. The time error of each stirring stage is within +/-1 s.
The fourth step: test results
And (3) after the stirring is finished, putting the glass plate into a vertical test mold for measuring the initial setting time in the middle of the glass plate within 30 seconds, leveling the top end, quickly lifting the test mold within 1-3 seconds, and measuring the expansion degree of the mortar when the mortar stops flowing or 30 seconds. If the expansion degree is not less than 180mm, the fine aggregate to be detected is qualified and can enter a field; if the diameter is less than 180mm, the product is unqualified and cannot enter the field.
The fine aggregate passing through the inspection by the method can ensure the fluidity of mortar in concrete and has better wrapping property on coarse aggregate in concrete. The method can be used for detecting qualified fine aggregate, eliminating the hidden danger of weathered change, avoiding the adsorption of liquid in concrete, and improving the workability and durability. The fine aggregate qualified by the method can better meet the working requirement of concrete, reduce the quality hidden trouble and reduce the cost.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A fine aggregate approach rapid inspection method comprises the following steps:
mixing cement, fine aggregate to be detected, an additive and water to obtain mortar;
and scraping the top end of the mortar after the mortar is filled into a vertical test mold within 30 seconds to obtain a test mold to be tested, lifting the test mold to be tested within 1-3 seconds, measuring the spreading degree of the mortar when the mortar in the test mold to be tested stops flowing when the time required by the mortar in the test mold to be tested to stop flowing is less than 30 seconds, measuring the spreading degree of the mortar after the test mold to be tested is lifted 30 seconds when the time required by the mortar in the test mold to be tested to stop flowing is not less than 30 seconds, and if the spreading degree of the mortar is not less than 180mm, detecting the fine aggregate to be tested to be qualified and entering the field, and if the spreading degree of the mortar is less than 180mm, detecting the fine aggregate to be tested to be unqualified and failing to enter the field.
2. The method of claim 1, wherein the mixing is performed in a mixing sequence of standard cement mortar.
3. The inspection method according to claim 1, wherein the admixture is a polycarboxylic acid admixture.
4. The inspection method according to claim 1, wherein the vertical jig is fixed with a glass plate.
5. The method of claim 1, wherein the vertical jig is a vertical jig for measuring initial setting time.
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| CN201810994268.XA CN109100265B (en) | 2018-08-29 | 2018-08-29 | Rapid inspection method for fine aggregate entering field |
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| CN201810994268.XA CN109100265B (en) | 2018-08-29 | 2018-08-29 | Rapid inspection method for fine aggregate entering field |
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| CN109100265B true CN109100265B (en) | 2021-03-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112461708A (en) * | 2020-12-11 | 2021-03-09 | 滁州中联混凝土有限公司 | Rapid approach inspection method for admixture for concrete |
| CN114311287A (en) * | 2021-12-13 | 2022-04-12 | 中建西部建设北方有限公司 | Dry powder machine-made sand entering fast treatment method and application thereof |
Citations (4)
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| CN101980014A (en) * | 2010-10-21 | 2011-02-23 | 安徽中铁工程材料科技有限公司 | Method for testing adaptability of polycarboxylic water reducer and cement |
| CN104568660A (en) * | 2014-12-22 | 2015-04-29 | 中铁成都工程检测咨询有限责任公司 | Method for testing adaptability between water reducing agent and concrete and expansion degree test device |
| CN105699253A (en) * | 2016-01-04 | 2016-06-22 | 湖南中岩建材科技有限公司 | Method for quickly identifying adaptability of concrete admixtures and additive |
| CN106092824A (en) * | 2016-05-31 | 2016-11-09 | 中铁十四局集团第三工程有限公司 | A kind of self-compacting concrete mobility-detected device and detection method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2984087B2 (en) * | 1991-04-23 | 1999-11-29 | 株式会社大林組 | Concrete flowability test method |
| JP4192122B2 (en) * | 2004-07-06 | 2008-12-03 | パシフィックテクノス株式会社 | Concrete mix design system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980014A (en) * | 2010-10-21 | 2011-02-23 | 安徽中铁工程材料科技有限公司 | Method for testing adaptability of polycarboxylic water reducer and cement |
| CN104568660A (en) * | 2014-12-22 | 2015-04-29 | 中铁成都工程检测咨询有限责任公司 | Method for testing adaptability between water reducing agent and concrete and expansion degree test device |
| CN105699253A (en) * | 2016-01-04 | 2016-06-22 | 湖南中岩建材科技有限公司 | Method for quickly identifying adaptability of concrete admixtures and additive |
| CN106092824A (en) * | 2016-05-31 | 2016-11-09 | 中铁十四局集团第三工程有限公司 | A kind of self-compacting concrete mobility-detected device and detection method |
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