阅读说明：本技术 一种陶瓷抛光渣水泥安定性的检测方法及其应用 (Detection method for cement stability of ceramic polishing slag and application thereof ) 是由 张大康 于 2020-03-16 设计创作，主要内容包括：本发明公开了一种抛光渣水泥安定性的检测方法,其包括：(1)将水泥、水和抛光渣按照重量比为1：(0.3-0.7)：(0.1-0.5)混合均匀,得到浆料,并采用浆料制备试件；(2)将所述试件恒温恒湿养护20-30h；(3)将所述试件放入15-25℃的水中浸泡养护,养护预设时间后,根据养护前后尺寸变化计算试件膨胀率,评价抛光渣水泥的安定性；或根据试样外观变形、开裂情况评价抛光渣水泥的安定性。本发明的安定性检测方法,检测条件与实际应用更加相近,且充分考虑了陶瓷抛光渣中各种成分对于安定性的影响,保证了数据的合理性和科学性。为陶瓷抛光渣水泥的生产、应用提供可靠、准确的依据。(The invention discloses a method for detecting the stability of polishing slag cement, which comprises the following steps: (1) mixing cement, water and polishing slag according to a weight ratio of 1: (0.3-0.7): (0.1-0.5) uniformly mixing to obtain slurry, and preparing a test piece by adopting the slurry; (2) maintaining the test piece for 20-30h at constant temperature and humidity; (3) soaking and curing the test piece in water at 15-25 ℃, and after curing for a preset time, calculating the expansion rate of the test piece according to the dimensional change before and after curing, and evaluating the stability of the polishing slag cement; or evaluating the stability of the polishing slag cement according to the deformation and cracking conditions of the appearance of the sample. According to the stability detection method disclosed by the invention, the detection conditions are more similar to those of practical application, the influence of various components in the ceramic polishing slag on the stability is fully considered, and the reasonability and the scientificity of data are ensured. Provides reliable and accurate basis for the production and application of the ceramic polishing slag cement.)

1. The method for detecting the stability of the polishing slag cement is characterized by comprising the following steps:

(1) mixing cement, water and polishing slag according to a weight ratio of 1: (0.3-0.7): (0.1-0.5) uniformly mixing to obtain slurry, and preparing a test piece by adopting the slurry;

(2) maintaining the test piece for 20-30h at constant temperature and humidity;

(3) soaking and curing the test piece in water at 15-25 ℃, and after curing for a preset time, calculating the expansion rate of the test piece according to the dimensional change before and after curing, and evaluating the stability of the polishing slag cement;

or evaluating the stability of the polishing slag cement according to the deformation and cracking conditions of the appearance of the sample.

2. The method for detecting the stability of the cement in the polishing slurry according to claim 1, wherein in the step (1), the slurry is prepared into a Reye test piece;

in the step (2), maintaining the Lee's clamp test piece for 20-30h at constant temperature and humidity, and recording the distance A between the tips of the fingers of the Lee's clamp;

in the step (3), the Lee's clamp test piece is placed into water of 15-25 ℃ for soaking and curing, and after curing for a preset time, the distance B between the tips of the Lee's clamp fingers is recorded; calculating the expansion rate of the test piece by utilizing the spacing A and the spacing B so as to represent the stability of the polishing slag cement;

wherein the expansion rate of the test piece is calculated by the following formula:

wherein E is the expansion rate of the test piece, A is the distance between the tips of the Rayleigh clamp pointer after constant temperature and humidity curing, and B is the distance between the tips of the Rayleigh clamp pointer after soaking curing.

3. The method for detecting the stability of the polishing slurry cement as claimed in claim 2, wherein the step (1) comprises the following steps:

(1.1) polishing slag, cement and water in a weight ratio of 1: (0.3-0.7): (0.1-0.5) uniformly mixing to obtain slurry;

(1.2) preventing the Leeb from being placed on a glass plate, taking a proper amount of slurry to fill the Leeb in one step, slightly holding the Leeb by one hand during slurry filling, inserting and tamping the slurry for 3 times by the other hand by using a straight-edge spatula with the width of about 25mm, then leveling, and covering the glass plate to obtain a Leeb test piece.

4. The method for detecting the stability of the cement with the polishing residues as claimed in claim 1, wherein in the step (3), the test piece is placed in water at 15-25 ℃ for soaking and curing, taken out after curing for a preset time, and the test piece is visually inspected whether collapse, cracking and bending occur or not to determine whether bending occurs or not to evaluate the stability of the cement with the polishing residues;

the method for measuring the bending of the test piece comprises the following steps: the bottom of the steel ruler is tightly attached to the bottom of the test cake, the steel ruler is rotated, and if light is transmitted between the steel ruler and the test cake, the steel ruler is bent.

5. The method for detecting the stability of the polishing slurry cement as claimed in claim 4, wherein the step (1) comprises the following steps:

(1.1) polishing slag, cement and water in a weight ratio of 1: (0.3-0.7): (0.1-0.5) uniformly mixing to obtain slurry;

(1.2) taking a proper amount of slurry, making the slurry into an approximate sphere by a spatula in a stirring pot, placing the sphere in the center of flat glass with the side length of 100mm and the thickness of 4mm-5mm coated with oil on the surface, slightly vibrating the glass plate, beating the slurry by the spatula, and spreading the slurry on the glass plate; rotating the glass plate, and smearing the clean slurry from the edge to the center by using a spatula wiped by wet cloth to prepare a test cake with a smooth surface; the diameter of the test cake is 70mm-80mm, the center thickness is about 10mm, the edge is gradually thinned, and the edge thickness is 0.5mm-1 mm.

6. The method for detecting the stability of the polishing slag cement as claimed in claim 1, wherein the cement is selected from P.I, P.II or P.O cement specified in GB/T175-2007.

7. The method for detecting the cement stability of the polishing slag as claimed in claim 1, wherein the polishing slag is the waste slag generated in the production process of the polishing brick, and contains 0.001-0.05 wt% of polyacrylamide.

8. The method for detecting the stability of the cement in the polishing slurry as claimed in claim 1, wherein in the step (1), the cement: water: 1, polishing slag: (0.4-0.6): (0.2-0.4).

9. The method for testing the stability of the cement of the polishing slag according to claim 1, wherein in the step (3), the preset time is 7 days, 14 days, 28 days, 60 days and 90 days.

10. The use of the method for testing the stability of cement with polishing residues as claimed in any one of claims 1 to 9 in the production, inspection and construction processes of cement.

Technical Field

The invention relates to the technical field of cement performance detection, in particular to a method for detecting cement stability of ceramic polishing slag and application thereof.

Background

The ceramic polished brick powder is waste powder produced by grinding and polishing the ceramic polished brick in the production process, has fine particles, high specific surface area and certain volcanic ash activity, contains a small amount of glass phase, is used as an auxiliary cementing material of concrete and has certain theoretical basis. The existing research points out that: the addition of the ceramic polished brick powder can enhance the sulfate resistance, strength and erosion resistance of concrete. However, the polishing slurry has a large fluctuation of chemical composition, so that the stability problem may exist, and the application of the polishing slurry in concrete is restricted.

On the other hand, the current method for testing the stability of the cement is GB/T1346 'method for testing water consumption, setting time and stability of standard consistency of cement', a boiling method is adopted for testing, and the difference between the method and the actual working condition is far; due to the specificity of the components of the ceramic polishing slag, the method is difficult to accurately reflect the stability of the ceramic polishing slag cement under actual conditions, and the application of the ceramic polishing slag is influenced.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for detecting the stability of ceramic polishing slag cement, which can accurately and truly reflect the stability of the ceramic polishing slag cement and provide reliable and accurate basis for reasonable application of the ceramic polishing slag in the cement.

The invention also aims to solve the technical problem of providing the application of the method for detecting the stability of the ceramic polishing slag cement in the cement production, detection and construction processes.

In order to solve the technical problems, the invention provides a method for detecting the stability of polishing slag cement, which comprises the following steps:

(1) mixing cement, water and polishing slag according to a weight ratio of 1: (0.3-0.7): (0.1-0.5) uniformly mixing to obtain slurry, and preparing a test piece by adopting the slurry;

(2) maintaining the test piece for 20-30h at constant temperature and humidity;

(3) soaking and curing the test piece in water at 15-25 ℃, and after curing for a preset time, calculating the expansion rate of the test piece according to the dimensional change before and after curing, and evaluating the stability of the polishing slag cement;

or evaluating the stability of the polishing slag cement according to the deformation and cracking conditions of the appearance of the sample.

As an improvement of the technical scheme, in the step (1), preparing the slurry into a Leeb clamp test piece;

in the step (2), maintaining the Lee's clamp test piece for 20-30h at constant temperature and humidity, and recording the distance A between the tips of the fingers of the Lee's clamp;

in the step (3), the Lee's clamp test piece is placed into water of 15-25 ℃ for soaking and curing, and after curing for a preset time, the distance B between the tips of the Lee's clamp fingers is recorded; calculating the expansion rate of the test piece by utilizing the spacing A and the spacing B so as to represent the stability of the polishing slag cement;

wherein the expansion rate of the test piece is calculated by the following formula:

wherein E is the expansion rate of the test piece, A is the distance between the tips of the Rayleigh clamp pointer after constant temperature and humidity curing, and B is the distance between the tips of the Rayleigh clamp pointer after soaking curing.

As an improvement of the technical scheme, the step (1) comprises the following steps:

(1.1) polishing slag, cement and water in a weight ratio of 1: (0.3-0.7): (0.1-0.5) uniformly mixing to obtain slurry;

(1.2) preventing the Leeb from being placed on a glass plate, taking a proper amount of slurry to fill the Leeb in one step, slightly holding the Leeb by one hand during slurry filling, inserting and tamping the slurry for 3 times by the other hand by using a straight-edge spatula with the width of about 25mm, then leveling, and covering the glass plate to obtain a Leeb test piece.

As an improvement of the technical scheme, in the step (3), the test piece is placed into water at 15-25 ℃ for soaking and curing, the test piece is taken out after curing for a preset time, whether the test cake collapses, cracks and bends or not is visually observed, and whether the test piece bends or not is determined so as to evaluate the stability of the polishing slag cement;

the method for measuring the bending of the test piece comprises the following steps: the bottom of the steel ruler is tightly attached to the bottom of the test cake, the steel ruler is rotated, and if light is transmitted between the steel ruler and the test cake, the steel ruler is bent.

As an improvement of the technical scheme, the step (1) comprises the following steps:

(1.1) polishing slag, cement and water in a weight ratio of 1: (0.3-0.7): (0.1-0.5) uniformly mixing to obtain slurry;

(1.2) taking a proper amount of slurry, making the slurry into an approximate sphere by a spatula in a stirring pot, placing the sphere in the center of flat glass with the side length of 100mm and the thickness of 4mm-5mm coated with oil on the surface, slightly vibrating the glass plate, beating the slurry by the spatula, and spreading the slurry on the glass plate; rotating the glass plate, and smearing the clean slurry from the edge to the center by using a spatula wiped by wet cloth to prepare a test cake with a smooth surface; the diameter of the test cake is 70mm-80mm, the center thickness is about 10mm, the edge is gradually thinned, and the edge thickness is 0.5mm-1 mm;

as an improvement of the technical proposal, the cement adopts P.I, P.II or P.O cement specified in GB/T175-2007.

As an improvement of the technical scheme, the polishing slag is waste slag generated in the production process of the polishing brick, and contains 0.001-0.05 wt% of polyacrylamide.

As an improvement of the above technical scheme, in the step (1), cement: water: 1, polishing slag: (0.4-0.6): (0.2-0.4).

As an improvement of the above technical solution, in the step (3), the preset time is 7 days, 14 days, 28 days, 60 days, and 90 days.

Correspondingly, the invention also discloses the application of the method for testing the stability of the polishing slag cement in the cement production, detection and construction processes.

The implementation of the invention has the following beneficial effects:

according to the stability detection method disclosed by the invention, the detection conditions are more similar to those of practical application, the influence of various components in the ceramic polishing slag on the stability is fully considered, and the reasonability and the scientificity of data are ensured. Provides reliable and accurate basis for the production and application of the ceramic polishing slag cement.

Drawings

FIG. 1 is a flow chart of a method for detecting stability of ceramic polishing slurry cement according to an embodiment of the present invention;

FIG. 2 is a flow chart of a method for testing stability of ceramic polishing slurry cement in another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

Referring to fig. 1, the invention provides a method for detecting stability of polishing slurry cement, which comprises the following steps:

s11: uniformly mixing cement, water and polishing slag to obtain slurry, and preparing a test piece by adopting the slurry;

wherein the cement is selected from P.I, P.II or P.O cement specified in GB/T175-2007. The polishing slag is the slag generated in the production process of the polishing brick, and contains 0.001-0.05 wt% of polyacrylamide.

Cement: water: 1, polishing slag: (0.3-0.7): (0.1-0.5), preferably 1: (0.4-0.6): (0.2-0.4). It should be noted that in conventional concrete, it is common to control (cement + other sand powder): water 1: (0.3-0.5), under the water-cement ratio, the concrete has good hydration performance. However, the ceramic polishing slag contains a small amount of polyacrylamide, and has fine particle size, high specific surface area and strong pozzolanic reaction, which results in high amount of chemically bound water in the former period. Therefore, for good stability of the reactive ceramic polishing slag cement, the invention controls (cement + polishing slag): water ═ 1.1 to 1.3: (0.4-0.5).

Specifically, S11 includes:

s111: polishing slag, cement and water are mixed according to the weight ratio of 1: (0.3-0.7): (0.1-0.5) uniformly mixing to obtain slurry;

s112: taking a proper amount of slurry, making the slurry into an approximate sphere by a spatula in a stirring pot, placing the sphere in the center of flat glass with the side length of 100mm and the thickness of 4mm-5mm coated with oil on the surface, slightly vibrating the glass plate, and beating the slurry by the spatula to spread the slurry on the glass plate; rotating the glass plate, and smearing the clean slurry from the edge to the center by using a spatula wiped by wet cloth to prepare a test cake with a smooth surface; the diameter of the test cake is 70mm-80mm, the center thickness is about 10mm, the edge is gradually thinned, and the edge thickness is 0.5mm-1 mm.

S12: maintaining the test piece for 20-30h at constant temperature and humidity;

specifically, the test piece is maintained for 20-30h under the conditions of 30-50 ℃ and 90-100% of humidity; preferably, curing is carried out for 25-30h, and the inventor finds through tests that the ceramic polishing slag can prolong the final setting time of the cement although the initial setting time of the cement can be reduced; therefore, at this stage, the curing time is prolonged.

S13: and (3) soaking and curing the test piece in water at 15-25 ℃, and after curing for a preset time, evaluating the stability of the polishing slag cement according to the deformation and cracking conditions of the appearance of the test piece.

Wherein, when the test pieces are cured for 7 days, 14 days, 28 days, 60 days and 90 days, the test piece is removed from the curing water for inspection, whether the test piece is collapsed, cracked and bent or not is recorded, and the result and the curing time are recorded. Except for the age of 90 days, the test cakes in the rest ages are put back into water for continuous maintenance after being checked.

Specifically, the collapse and the crack of the test cake are measured by adopting an eye test method; the test method for the bending of the test piece comprises the following steps: the bottom of the steel ruler is tightly attached to the bottom of the test cake, the steel ruler is rotated, and if light is transmitted between the steel ruler and the test cake, the steel ruler is bent. And when the test piece has no collapse, cracking and bending, judging that the stability is not qualified. The detection method is simple and easy to implement and simple and convenient to operate.

In the prior art (GB/T1346-2011), after constant-temperature and constant-humidity curing, the temperature is measured by a water boiling method, and the measurement temperature is 90-100 ℃. However, through research, the inventor finds that, on one hand, after the ceramic polishing slag is mixed with cement, hydration reaction is often generated between the ceramic polishing slag and the cement to form calcium silicate hydrate, the crystal form of the calcium silicate hydrate changes along with the temperature, the calcium silicate hydrate is often converted into a needle shape from a sheet shape in the process of increasing the temperature, and the expansion of the calcium silicate hydrate are completely different; on the other hand, polyacrylamide in the ceramic polishing slag is gradually decomposed at 60 ℃ or higher, and the performance of cement is also affected. Therefore, in order to accurately reflect the stability of the polishing slag cement, the invention adopts normal temperature water for soaking and curing.

Referring to fig. 2, the invention also discloses another method for detecting the stability of the ceramic polishing slag cement, which comprises the following steps:

s21: uniformly mixing cement, water and polishing slag to obtain slurry, and preparing a Leeb clamp test piece by using the slurry;

wherein the cement is selected from P.I, P.II or P.O cement specified in GB/T175-2007. The polishing slag is the slag generated in the production process of the polishing brick, and contains 0.001-0.05 wt% of polyacrylamide.

Cement: water: 1, polishing slag: (0.3-0.7): (0.1-0.5), preferably 1: (0.4-0.6): (0.2-0.4). It should be noted that in conventional concrete, it is common to control (cement + other sand powder): water 1: (0.3-0.5), under the water-cement ratio, the concrete has good hydration performance. However, the ceramic polishing slag contains a small amount of polyacrylamide, and has fine particle size, high specific surface area and strong pozzolanic reaction, which results in high amount of chemically bound water in the former period. Therefore, for good stability of the reactive ceramic polishing slag cement, the invention controls (cement + polishing slag): water ═ 1.1 to 1.3: (0.4-0.5).

Specifically, S21 includes:

s211: polishing slag, cement and water are mixed according to the weight ratio of 1: (0.3-0.7): (0.1-0.5) uniformly mixing to obtain slurry;

s212: and (3) preventing the Leeb clamp from being placed on a glass plate, taking a proper amount of slurry, filling the Leeb clamp with the slurry once, slightly holding the Leeb clamp by one hand during slurry filling, inserting and tamping the slurry for 3 times by the other hand by using a straight-edge spatula with the width of about 25mm, then leveling, and covering the glass plate to obtain a Leeb clamp test piece.

S22: maintaining the Leeb clip test piece for 20-30h at constant temperature and humidity, and recording the distance A between the tips of the fingers of the Leeb clip;

specifically, the test piece is maintained for 20-30h under the conditions of 30-50 ℃ and 90-100% of humidity; preferably, curing is carried out for 25-30h, and the inventor finds through tests that the ceramic polishing slag can prolong the final setting time of the cement although the initial setting time of the cement can be reduced; therefore, at this stage, the curing time is prolonged.

S23: soaking and curing the Leeb clip test piece in water at 15-25 ℃, and recording the distance B between the tips of the fingers of the Leeb clip after curing for a preset time; calculating the expansion rate of the test piece by utilizing the spacing A and the spacing B so as to represent the stability of the polishing slag cement;

wherein, when the test pieces are cured for 7 days, 14 days, 28 days, 60 days and 90 days, the test piece is removed from the curing water for inspection, whether the test piece is collapsed, cracked and bent or not is recorded, and the result and the curing time are recorded. Except for the age of 90 days, the test cakes in the rest ages are put back into water for continuous maintenance after being checked.

Specifically, the expansion ratio of the test piece is calculated by the following formula:

wherein E is the expansion rate of the test piece, A is the distance between the tips of the Rayleigh clamp pointer after constant temperature and humidity curing, and B is the distance between the tips of the Rayleigh clamp pointer after soaking curing.

Specifically, when the expansion rate E of the test piece is more than or equal to 0.04 percent, the stability is unqualified; when E is less than 0.04%, the stability is qualified.

The invention is further illustrated by the following specific examples: