CN112798463A - Test method for determining solid density of slurry - Google Patents
Test method for determining solid density of slurry Download PDFInfo
- Publication number
- CN112798463A CN112798463A CN202110206880.8A CN202110206880A CN112798463A CN 112798463 A CN112798463 A CN 112798463A CN 202110206880 A CN202110206880 A CN 202110206880A CN 112798463 A CN112798463 A CN 112798463A
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- slurry
- measuring
- admixture
- density
- gas content
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- 239000002002 slurry Substances 0.000 title claims abstract description 76
- 239000007787 solid Substances 0.000 title claims abstract description 36
- 238000010998 test method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 10
- 238000005303 weighing Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 239000011268 mixed slurry Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 11
- 239000000843 powder Substances 0.000 abstract description 9
- 239000002245 particle Substances 0.000 abstract description 8
- 239000004568 cement Substances 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
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Classifications
-
- 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
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
- G01N9/04—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of fluids
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention relates to a method for measuring the density degree of slurry in concrete, in particular to a test method for measuring the density of the slurry. Firstly, weighing a certain amount of water, a water reducing agent and a cementing material, and mixing to prepare slurry; measuring the gas content of the slurry by using a mortar gas content instrument; taking the same slurry and measuring the mass and volume of the slurry; obtaining the solid volume of the slurry through gas content correction calculation; the mass of the slurry is divided by the solid volume of the slurry to give the solid density of the slurry. Compared with the method for detecting the bulk density of the powder, the method for detecting the solid density of the slurry satisfactorily solves the influence of homopolar repulsion among powder particles, so that the admixture filling effect is fully exerted. When the blending amount of the admixture is different, the change rule of the solid density of the slurry is obvious, the filling effect can be reflected visually, and a scientific theoretical basis is provided for the determination of the blending amount of the admixture.
Description
Technical Field
The invention relates to a method for measuring the density degree of slurry in concrete, in particular to a test method for measuring the density of the slurry.
Background
After the mineral admixture is added, the particle size and fineness of the admixture are smaller than those of cement, so that partial gaps in the cement can be filled, the pore diameter is optimized, and the compactness is increased.
In some literature data, it is shown that the filling effect of the admixture can be reflected by detecting the bulk density change of the powder material when different admixture amounts are added. However, tests show that the bulk density of the powder material does not have a regular trend of change with the increase of the admixture content, but irregularly fluctuates in a very close region. The main reason for this is that after the fineness of the solid particles reaches a certain degree, the particles have repulsion due to the same polarity. Therefore, it is not reliable to determine the filling and compacting effects by merely manually and physically mixing them uniformly and measuring the bulk density of the mixed powder material.
Disclosure of Invention
The invention provides a test method for measuring the solid density of slurry, aiming at solving the problem that the detection effect is poor due to homopolar repulsion among powder particles when the filling effect of an admixture is detected by detecting the bulk density of powder.
The invention is realized by adopting the following technical scheme: a test method for determining the solid density of slurry comprises the following steps: weighing a certain amount of water, a water reducing agent and a cementing material, and mixing to prepare slurry; measuring the gas content of the slurry by using a mortar gas content instrument; taking the same slurry and measuring the mass and volume of the slurry; obtaining the solid volume of the slurry through gas content correction calculation; the mass of the slurry is divided by the solid volume of the slurry to give the solid density of the slurry.
The influence of polarity among particles can be weakened to a certain extent by adding water, and the filling and compacting effects after the admixture is added are finally reflected in the increase of the compactness of slurry. Therefore, the filling effect can be judged by observing the change of the slurry compactness degree after the admixture is added. Meanwhile, by combining the action mechanism and the dispersion action of the water reducing agent, after the water reducing agent is added, the influence of the polarity among particles can be more effectively reduced, and the filling effect of the admixture in the slurry can be more fully exerted. Concept of solid density of slurry: after the water reducing agent is added, a certain amount of gas content is brought to the slurry due to the air entraining function of the water reducing agent. In order to eliminate the influence of the gas content in the slurry, when calculating the solid density of the slurry, the mass of the slurry is divided by the volume of the slurry minus the volume (and the solid volume) occupied by the gas content of the slurry, and the density is the solid density of the slurry.
According to the test method for measuring the solid density of the slurry, the influence of the doped admixture on the solid density degree of the slurry is observed by measuring the solid density change of the slurry of the mineral admixture with different doping amounts, and the optimal doping amount of the admixture is further determined.
The test method for measuring the solid density of the slurry comprises the following specific steps:
a. weighing a cementing material, water and a water reducing agent;
b. uniformly mixing water and a water reducing agent, adding the mixture into a stirring pot, and then adding a cementing material; immediately starting the mortar stirrer for stirring;
c. taking a measuring cylinder, and weighing the mass m1 of the measuring cylinder;
d. pouring the mixed slurry into a measuring cylinder, and prohibiting the slurry from contaminating the side wall of the measuring cylinder while avoiding introducing air bubbles;
e. reading the volume V of the slurry, and weighing the total mass m2 of the slurry and the measuring cylinder;
f. measuring the gas content a of the slurry by using a mortar gas content tester;
g. data processing: the solid density p of the slurry is calculated according to the following formula,
h. the blending amount of the admixture is changed, and the steps are repeated, so that the solid density of slurry of the admixture with different blending amounts can be measured.
Compared with the method for detecting the bulk density of the powder, the method for detecting the solid density of the slurry satisfactorily solves the influence of homopolar repulsion among powder particles, so that the admixture filling effect is fully exerted. When the blending amount of the admixture is different, the change rule of the solid density of the slurry is obvious, the filling effect can be reflected visually, and a scientific theoretical basis is provided for the determination of the blending amount of the admixture.
Drawings
FIG. 1 is a graph showing the relationship between the slag powder content and the solid density of the slurry.
Detailed Description
The invention relates to a test method for measuring the solid density of slurry.
(1) Detecting environmental requirements:
the temperature is 20 +/-2 ℃; the relative humidity is not less than 50%.
(2) The main apparatus comprises:
a cement mortar stirrer;
balance: the measuring range is 5000g, and the precision is 0.1 g;
balance: the range is 2000g, and the precision is 0.01 g;
a mortar gas content tester;
a measuring cylinder: 250 mL.
(3) The test steps are as follows:
a. weighing 2000g of cementing material, 580g of water and 20g of water reducing agent; the water reducing agent was weighed to 0.01g, the remaining materials to 0.1 g.
b. Uniformly mixing water and a water reducing agent, adding the mixture into a stirring pot, and then adding a cementing material; and immediately starting the mortar stirrer to stir (adopting a manual control stirring program, slowing for 120s, stopping for 15s, and speeding for 120 s).
c. A250 mL measuring cylinder is taken, the mass m1 of the measuring cylinder is weighed, and the weight m1 is weighed to 0.1 g.
d. And slowly and continuously pouring the mixed slurry into the measuring cylinder, wherein air bubbles are prevented from being introduced, and the slurry is prevented from staining the side wall of the measuring cylinder.
e. The volume V of the slurry was read, and the slurry and the total mass m2 of the graduated cylinder were weighed to 0.1 g.
f. And (4) measuring the gas content a of the slurry by using a mortar gas content measuring instrument.
(4) Data processing:
the solid density rho of the slurry is calculated according to the following formula, and the calculation is accurate to 0.001g/cm3。
(5) The blending amount of the admixture is changed, and the steps are repeated, so that the solid density of slurry of the admixture with different blending amounts can be measured.
Claims (3)
1. A test method for measuring the solid density of slurry is characterized in that: the method comprises the following steps: weighing a certain amount of water, a water reducing agent and a cementing material, and mixing to prepare slurry; measuring the gas content of the slurry by using a mortar gas content instrument; taking the same slurry and measuring the mass and volume of the slurry; obtaining the solid volume of the slurry through gas content correction calculation; the mass of the slurry is divided by the solid volume of the slurry to give the solid density of the slurry.
2. A test method for determining the bulk density of a slurry according to claim 1, wherein: the influence on the compact degree of the slurry after the admixture is added is observed by measuring the change of the solid density of the slurry of the mineral admixture with different doping amounts, and then the optimal doping amount of the admixture is determined.
3. A test method for determining the bulk density of a slurry according to claim 1 or 2, characterised in that: the method comprises the following specific steps:
a. weighing a cementing material, water and a water reducing agent;
b. uniformly mixing water and a water reducing agent, adding the mixture into a stirring pot, and then adding a cementing material; immediately starting the mortar stirrer for stirring;
c. taking a measuring cylinder, and weighing the mass m1 of the measuring cylinder;
d. pouring the mixed slurry into a measuring cylinder, and prohibiting the slurry from contaminating the side wall of the measuring cylinder while avoiding introducing air bubbles;
e. reading the volume V of the slurry, and weighing the total mass m2 of the slurry and the measuring cylinder;
f. measuring the gas content a of the slurry by using a mortar gas content tester;
g. data processing: the solid density p of the slurry is calculated according to the following formula,
h. the blending amount of the admixture is changed, and the steps are repeated, so that the solid density of slurry of the admixture with different blending amounts can be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110206880.8A CN112798463A (en) | 2021-02-24 | 2021-02-24 | Test method for determining solid density of slurry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110206880.8A CN112798463A (en) | 2021-02-24 | 2021-02-24 | Test method for determining solid density of slurry |
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| Publication Number | Publication Date |
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| CN112798463A true CN112798463A (en) | 2021-05-14 |
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| CN202110206880.8A Pending CN112798463A (en) | 2021-02-24 | 2021-02-24 | Test method for determining solid density of slurry |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117074231A (en) * | 2023-07-17 | 2023-11-17 | 山东国材益新建筑科技有限公司 | Rapid detection method for solid content of wastewater slurry in green building construction |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004093465A (en) * | 2002-09-03 | 2004-03-25 | Mitsubishi Heavy Ind Ltd | Weight measurement type slurry densitometer and measuring method |
| CN102621037A (en) * | 2012-03-19 | 2012-08-01 | 中建商品混凝土有限公司 | Method for testing particle packing density of concrete used powder |
| CN102768167A (en) * | 2011-05-05 | 2012-11-07 | 同济大学 | Method for testing bulk density and porosity of cement paste and device thereof |
| CN104764874A (en) * | 2015-03-31 | 2015-07-08 | 中铁第五勘察设计院集团有限公司 | Device and method for detecting air content in concrete mixture |
| CN108585635A (en) * | 2017-09-25 | 2018-09-28 | 佛山科学技术学院 | A method of improving material granule packed density by optimizing fine and close filling particle diameter distribution |
| CN111721669A (en) * | 2020-07-06 | 2020-09-29 | 北京中建建筑科学研究院有限公司 | Method for measuring apparent density and gas content of material |
-
2021
- 2021-02-24 CN CN202110206880.8A patent/CN112798463A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004093465A (en) * | 2002-09-03 | 2004-03-25 | Mitsubishi Heavy Ind Ltd | Weight measurement type slurry densitometer and measuring method |
| CN102768167A (en) * | 2011-05-05 | 2012-11-07 | 同济大学 | Method for testing bulk density and porosity of cement paste and device thereof |
| CN102621037A (en) * | 2012-03-19 | 2012-08-01 | 中建商品混凝土有限公司 | Method for testing particle packing density of concrete used powder |
| CN104764874A (en) * | 2015-03-31 | 2015-07-08 | 中铁第五勘察设计院集团有限公司 | Device and method for detecting air content in concrete mixture |
| CN108585635A (en) * | 2017-09-25 | 2018-09-28 | 佛山科学技术学院 | A method of improving material granule packed density by optimizing fine and close filling particle diameter distribution |
| CN111721669A (en) * | 2020-07-06 | 2020-09-29 | 北京中建建筑科学研究院有限公司 | Method for measuring apparent density and gas content of material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117074231A (en) * | 2023-07-17 | 2023-11-17 | 山东国材益新建筑科技有限公司 | Rapid detection method for solid content of wastewater slurry in green building construction |
| CN117074231B (en) * | 2023-07-17 | 2024-02-13 | 山东国材益新建筑科技有限公司 | Rapid detection method for solid content of wastewater slurry in green building construction |
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Application publication date: 20210514 |
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