CN110954682B - Method for detecting water retention of gypsum mortar - Google Patents
Method for detecting water retention of gypsum mortar Download PDFInfo
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- CN110954682B CN110954682B CN201811128445.2A CN201811128445A CN110954682B CN 110954682 B CN110954682 B CN 110954682B CN 201811128445 A CN201811128445 A CN 201811128445A CN 110954682 B CN110954682 B CN 110954682B
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- gypsum mortar
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- 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; ceramics; glass; bricks
Abstract
The invention discloses a method for detecting the water retention of gypsum mortar. The detection method comprises the following steps: determining the components of the gypsum mortar, preparing two samples by using 0.2 percent and 0.3 percent of the dosage of the water-retaining agent, and testing and calculating the samples after stirring; preparing a block containing air, and drawing a space with a 200mm interval on the surface of the block by using a marking pen after the block is flatly placed; iron blocks with different heights are respectively placed along side lines of the left side and the right side of the space; and paving the stirred gypsum mortar sample material between the two iron blocks, scraping the sample material into a slope shape by using a scraper, ensuring that the left side and the right side of the material are respectively consistent with the left iron block and the right iron block in height, placing the sample material at normal temperature for maintenance, and obtaining the minimum thickness of the water-retaining part of the gypsum mortar after the gypsum mortar is completely coagulated and hardened. The detection method is simple and rapid, not only solves the construction difficulty caused by excessive water retention agent consumption in the field construction process, but also solves the product quality problem caused by excessively low water retention agent consumption for saving cost, and avoids material waste.
Description
Technical Field
The invention belongs to the field of novel gypsum building materials, and relates to a method for detecting water-retaining property of gypsum mortar.
Background
The gypsum mortar is a green environment-friendly building material, takes desulfurized gypsum generated in the flue gas desulfurization process of a power plant as a main raw material, has light weight, heat preservation, fire prevention, small drying shrinkage coefficient and strong bonding force with a base material, does not bulge or crack, and is an interior wall leveling and plastering material with excellent performance. The gypsum mortar needs to be added with a water-retaining agent in the production process so as to increase the viscosity and the water retention of the gypsum mortar. Because the price of the water-retaining agent is high, the cost of the product is increased and the viscosity of the product is overlarge due to the excessive using amount of the water-retaining agent, and further the field construction of the product is difficult. The excessive water loss of the product before coagulation can be caused by the excessively low dosage of the water-retaining agent, so that the product has low strength and powder on the surface, and the determination of the dosage of the water-retaining agent is one of the most important links in the determination process of the gypsum mortar formula.
Disclosure of Invention
Aiming at the problems that in the prior art, the product cost is increased and the product viscosity is overlarge directly caused by the excessive consumption of the water retention agent, so that the field construction of the product is difficult; the invention provides a simple method for determining the dosage of a water-retaining agent of gypsum mortar.
The invention is realized by the following technical scheme:
the invention provides a method for detecting the water retention of gypsum mortar, which specifically comprises the following steps:
(1) determining the components of the gypsum mortar, preparing two samples by using the water-retaining agent accounting for 0.2 percent and 0.3 percent of the total mass of the gypsum mortar, and respectively testing and calculating the samples after stirring;
(2) preparing a completely dry cuboid aerated building block, wherein the length of the building block is more than 200mm, and drawing a space with a 200mm interval on the surface of the building block by using a marking pen after the building block is flatly placed;
(3) placing an iron block I with the width of 15mm and the height of 10mm along the left line of the 200mm interval; placing an iron block II with the width of 15mm and the height of 1mm along the right sideline with the distance of 200 mm; the length of the iron block is not less than the width of the building block;
(4) paving the gypsum mortar sample material stirred in the step (1) between two iron blocks, and scraping the gypsum mortar sample material into a slope shape by using a scraper, so as to ensure that the left side and the right side of the scraped material are respectively consistent with the left iron block and the right iron block in height;
(5) maintaining the aerated building block paved with the sample at normal temperature, after the gypsum mortar is completely coagulated and hardened, carefully checking the water retention condition of the gypsum mortar from the right side to the left side of the gypsum mortar, determining the boundary where the gypsum mortar retains water, and measuring the thickness of the gypsum mortar at the boundary to obtain the minimum thickness of the part of the gypsum mortar retaining water;
(6) experience proves that if the product formula can meet the water retention of a product with the thickness of 5mm under the laboratory condition, the product generally has no poor water retention on the construction site; the setting time of the product on the construction site is generally shortened, so the water retention of the product on the site is often better than that in a laboratory.
(7) And (3) calculating: if a sample with 0.2 wt% of water retaining agent is 8mm in minimum thickness and a sample with 0.3 wt% of water retaining agent is 3mm in minimum thickness, the minimum thickness of the product can be reduced by 1mm for each 0.02 wt% addition of water retaining agent, and if the product formulation is to meet the requirement of 5mm in maximum thickness, the amount of water retaining agent can be estimated to be 0.26 wt%.
The size of the building block in the step (2) is 600mm x 240mm x100 mm.
The method for detecting the water retention of the gypsum mortar is simple and rapid, and can accurately detect the using amount of the water retention agent when the water retention of the gypsum mortar is good, thereby not only solving the construction difficulty caused by excessive using amount of the water retention agent in the field construction process, but also solving the product quality problem caused by excessively low using amount of the water retention agent for saving the cost, and avoiding material waste.
Drawings
FIG. 1 is a side view of an aerated block of the invention laid with gypsum mortar.
FIG. 2 is a top view of an aerated block with gypsum mortar laid thereon after the gypsum mortar is completely set and hardened according to the present invention.
In FIGS. 1-2, each is labeled as: 1 aerated building block, 2 gypsum mortar, A gypsum mortar with good water-retaining property, and B gypsum mortar with poor water-retaining property.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments and a part of data, and examples used herein are only for explaining the present invention and are not intended to limit the present invention.
Examples
The invention relates to a method for detecting the water retention of gypsum mortar, which comprises the following steps:
(1) determining the components of the gypsum mortar, preparing two samples by using the water-retaining agent accounting for 0.2 percent and 0.3 percent of the total mass of the gypsum mortar, and testing and calculating the samples after stirring;
(2) preparing a completely dry cuboid aerated block 1, wherein the size of the block is 600mm x 240mm x100mm, and drawing a space with a 200mm distance on the surface of the block by using a marker pen after the block is flatly placed;
(3) placing an iron block I with the width of 15mm and the height of 10mm along the left line of the 200mm interval; placing an iron block II with the width of 15mm and the height of 1mm along the right sideline with the distance of 200 mm; the length of the iron block is not less than 240 mm;
(4) paving the stirred gypsum mortar sample material between the two iron blocks, and scraping the gypsum mortar sample material into a slope shape by using a scraper, so that the left side and the right side of the scraped material are respectively consistent with the left iron block and the right iron block in height;
(5) maintaining the aerated building block paved with the sample at normal temperature, after the gypsum mortar is completely condensed and hardened, carefully checking the water retention condition of the gypsum mortar from the right side to the left side of the gypsum mortar to obtain the boundary where the gypsum mortar retains water, wherein A in the figure 2 is the gypsum mortar with good water retention, B is the gypsum mortar with poor water retention, and then measuring the thickness of the gypsum mortar between the two, wherein the thickness is the minimum thickness of the part of the gypsum mortar retaining water;
(6) experience proves that if the product formula can meet the water retention of a product with the thickness of 5mm under the laboratory condition, the product generally has no poor water retention on the construction site; the setting time of the product on the construction site is generally shortened, so the water retention of the product on the site is often better than that in a laboratory.
(7) And (3) calculating: if a sample with 0.2 wt% of water retaining agent is 8mm in minimum thickness and a sample with 0.3 wt% of water retaining agent is 3mm in minimum thickness, the minimum thickness of the product can be reduced by 1mm for each 0.02 wt% addition of water retaining agent, and if the product formulation is to meet the requirement of 5mm in maximum thickness, the amount of water retaining agent can be estimated to be 0.26 wt%.
The above examples are merely illustrative for clarity of description and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (2)
1. A method for detecting the water retention of gypsum mortar is characterized by comprising the following steps:
(1) determining the components of the gypsum mortar, preparing two samples by respectively using the water-retaining agent accounting for 0.2 percent and 0.3 percent of the total mass of the gypsum mortar, and respectively testing and calculating the samples after stirring;
(2) preparing a completely dry cuboid aerated building block, wherein the length of the building block is more than 200mm, and drawing a space with a 200mm interval on the surface of the building block by using a marking pen after the building block is flatly placed;
(3) placing an iron block I with the width of 15mm and the height of 10mm along the left line of the 200mm interval; placing an iron block II with the width of 15mm and the height of 1mm along the right sideline with the distance of 200 mm; the length of the iron block is not less than the width of the building block;
(4) paving the gypsum mortar sample material stirred in the step (1) between two iron blocks, and scraping the gypsum mortar sample material into a slope shape by using a scraper, so as to ensure that the left side and the right side of the scraped material are respectively consistent with the left iron block and the right iron block in height;
(5) maintaining the aerated building block paved with the sample at normal temperature, after the gypsum mortar is completely coagulated and hardened, carefully checking the water retention condition of the gypsum mortar from the right side to the left side of the gypsum mortar, determining the boundary where the gypsum mortar retains water, and measuring the thickness of the gypsum mortar at the boundary to obtain the minimum thickness of the part of the gypsum mortar retaining water;
(6) experience proves that if the formula of the gypsum mortar product can meet the requirement that a product with the thickness of 5mm can retain water on the aerated building block under the laboratory condition, the product generally has no condition of poor water retention performance on a construction site;
(7) and (3) calculating: if the minimum thickness of the water retention of a sample with the amount of the water retention agent of 0.2 wt% is 8mm, and the minimum thickness of the water retention of a sample with the amount of the water retention agent of 0.3 wt% is 3mm, the minimum thickness of the water retention of the product can be reduced by 1mm for each 0.02 wt% addition of the water retention agent, and if the gypsum mortar product formulation is required to meet the water retention requirement of a product with the thickness of 5mm, the amount of the water retention agent can be estimated to be 0.26 wt%.
2. The method for detecting water retention of gypsum mortar according to claim 1, wherein the block size in step (2) is 600mm x 240mm x100 mm.
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| CN201811128445.2A CN110954682B (en) | 2018-09-27 | 2018-09-27 | Method for detecting water retention of gypsum mortar |
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| CN201811128445.2A CN110954682B (en) | 2018-09-27 | 2018-09-27 | Method for detecting water retention of gypsum mortar |
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| CN110954682B true CN110954682B (en) | 2022-03-18 |
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| CN114397201B (en) * | 2021-12-17 | 2023-12-12 | 中建材创新科技研究院有限公司 | Method for determining self-leveling safe construction thickness of gypsum |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH498784A (en) * | 1969-05-21 | 1970-11-15 | Sels Et Prod Chim Sa | Mortar composition |
| CN1962529A (en) * | 2006-11-24 | 2007-05-16 | 广东工业大学 | Modified gypsum water-keeping mortar preparation formula |
| CN105672555A (en) * | 2016-01-13 | 2016-06-15 | 济南大学 | Composite insulation building blocks and production method thereof |
| CN108314379A (en) * | 2018-01-26 | 2018-07-24 | 云南工程建设总承包股份有限公司 | Ultra-thin special masonry mortar for autoclave aerated concrete building block and light-duty building block |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050016422A1 (en) * | 2001-10-12 | 2005-01-27 | Isao Kamada | Mortar composition |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH498784A (en) * | 1969-05-21 | 1970-11-15 | Sels Et Prod Chim Sa | Mortar composition |
| CN1962529A (en) * | 2006-11-24 | 2007-05-16 | 广东工业大学 | Modified gypsum water-keeping mortar preparation formula |
| CN105672555A (en) * | 2016-01-13 | 2016-06-15 | 济南大学 | Composite insulation building blocks and production method thereof |
| CN108314379A (en) * | 2018-01-26 | 2018-07-24 | 云南工程建设总承包股份有限公司 | Ultra-thin special masonry mortar for autoclave aerated concrete building block and light-duty building block |
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| 建筑保温砂浆的种类及性能综述;张常河 等;《现代农业》;20110501;第215-217页 * |
| 砂浆保水性测试方法的研究;李伟 等;《新型建筑材料》;20110630;第15-24页 * |
| 纤维素醚在水泥基干拌砂浆产品中的应用;L.Schmitz 等;《新型建筑材料》;20060731;第45-48页 * |
| 预拌砂浆质量对抹灰层质量的影响分析;张健 等;《材料研究与应用》;20141130;第92-94页 * |
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