CN114014606A - Slurry preparation and pore detection method for concrete surface pore marking - Google Patents
Slurry preparation and pore detection method for concrete surface pore marking Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
- C04B28/146—Calcium sulfate hemi-hydrate with a specific crystal form alpha-hemihydrate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/28—Measuring arrangements characterised by the use of optical techniques for measuring areas
- G01B11/285—Measuring arrangements characterised by the use of optical techniques for measuring areas using photoelectric detection means
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00991—Uses not provided for elsewhere in C04B2111/00 for testing
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Abstract
The invention provides a slurry preparation and air hole detection method for marking air holes on a concrete surface. The color of the slurry used in the invention is obviously different from the inherent color of the concrete, thereby effectively eliminating the interference of the shooting angle, the light and the chromatic aberration of the concrete surface to the air hole detection during the image collection, more accurately marking the position, the size and the area of the air hole and having more accurate and reliable test result.
Description
Technical Field
The invention relates to the technical field of concrete material technology and detection, in particular to a slurry preparation and air hole detection method for marking air holes on the surface of concrete.
Background
With the continuous development of concrete technology and the continuous upgrading of the construction industry, the problem of the apparent quality of concrete is concerned. Firstly, the excellent concrete appearance quality generally does not need secondary treatment after the concrete is poured and formed, so that a large amount of material cost and labor cost can be saved; secondly, the excellent concrete apparent quality can improve the durability of the concrete; finally, the excellent apparent mass gives the concrete a plain aesthetic feel not seen with other materials. The surface air holes are main factors influencing the concrete apparent quality, and the detection of the surface air holes is the main content for inspecting the concrete apparent quality.
Although at present, the coagulation is commonThe concrete engineering acceptance has no special requirements on the apparent quality of the concrete, but JGJ 169-2009 Fair-faced concrete application technical Specification clearly requires that the maximum diameter of the air holes on the concrete surface cannot exceed 8mm, and the area of the air holes on the concrete surface per square meter cannot exceed 20cm2. In the related standards, the recommended measurement method for the pore diameter and the pore area is ruler measurement, the method is complicated, the measurement process is time-consuming and labor-consuming, errors can be caused to the measurement result by subjective judgment, and some small pores on the surface of the concrete are not easy to be measured statistically. There are related documents that propose that after an Image is collected on the concrete surface, Image Pro Plus software is used to distinguish surface pores by using the characteristic that the pores and the concrete matrix have different colors so as to analyze the pore area. In the detection process, although the method can well perform statistical analysis on the size and the area of the air hole on the surface of the concrete, in the image acquisition process, the final detection result is greatly influenced by the photographing angle, the light intensity and the color difference of the surface of the concrete.
Disclosure of Invention
In order to solve the technical problems, the invention provides a concrete surface air hole detection method, which can more accurately indicate the position, the size and the area of an air hole, and the test result is more accurate and reliable.
The technical scheme adopted by the invention is as follows:
the invention provides a slurry for marking concrete surface air holes, which comprises the following raw materials in percentage by weight: 58 to 75 percent of P.W 32.5 cement, 0.5 to 1 percent of water reducing agent, 0.5 to 1 percent of methyl cellulose ether, 2 to 5 percent of redispersible latex powder, 20 to 25 percent of distilled water and 2 to 10 percent of nano titanium dioxide.
The invention provides another slurry for marking concrete surface air holes, which comprises the following raw materials in percentage by weight: 60-65% of alpha semi-hydrated gypsum, 25-35% of distilled water, 0.5-1% of methyl cellulose ether, 2.5-5% of redispersible latex powder and 2-10% of nano titanium dioxide.
In the invention, the water reducing agent is at least one of lignosulfonate water reducing agents, naphthalene high-efficiency water reducing agents, melamine high-efficiency water reducing agents, sulfamate high-efficiency water reducing agents, fatty acid high-efficiency water reducing agents and polycarboxylate high-efficiency water reducing agents.
In the invention, the redispersible latex powder is a powder adhesive prepared by spray drying at least one of ethylene/vinyl acetate copolymer, vinyl acetate/ethylene versatate copolymer and acrylic acid copolymer, and polyvinyl alcohol is used as protective colloid.
The invention also provides a preparation method of the slurry for marking the air holes on the surface of the concrete, which comprises the steps of uniformly mixing the raw materials according to the proportion, and rapidly stirring the mixture in a stirrer for 2-5 min to prepare the slurry.
The invention also provides a concrete surface air hole detection method, which comprises the following steps:
s1, sweeping away scraps on the surface of the concrete by using a soft brush, washing for 1-3 min under flowing clear water, and removing the clear water on the surface of the concrete by using a wet towel;
s2, uniformly coating the slurry on the surface of concrete by using a scraper;
s3, after 0.5-1.5 hours, lightly wiping off excessive slurry in degassing holes on the surface of the concrete by using a wet towel;
s4, photographing and sampling the surface of the concrete by using a digital camera with high resolution;
s5, analyzing the pore size and the pore area of the marked pores on the concrete surface by using Image Pro Plus.
The invention also provides a concrete surface air hole detection method, wherein the scraper and the concrete surface form an angle of 30-60 degrees.
The invention also provides a concrete surface air hole detection method, which is used for scraping the slurry for 20-30 times respectively in the horizontal direction and the vertical direction by using a scraper.
Due to the adoption of the technical scheme, the invention has the beneficial effects that: the two kinds of slurry mainly comprise P.W 32.5 cement and alpha semi-hydrated gypsum which are hydraulic cementing materials, and have excellent fluidity after being mixed with water under the action of auxiliaries such as a polycarboxylic acid water reducing agent, methyl cellulose ether, redispersible emulsion powder and the like, so that the slurry can well fill pores on the surface of concrete. In addition, the slurry can permeate into the concrete in the hydration process, a mechanical anchoring is formed between the generated hydration product and the concrete, the cementation hardening of the slurry in a concrete air hole is accelerated, the slurry is not easy to fall off in the wiping and testing processes, the slurry and the concrete have obvious color difference, the interference of the photographing angle, the light and the concrete surface color difference on the air hole detection during image collection is effectively eliminated, the position, the size and the area of the air hole can be more accurately shown, and the testing result is more accurate and reliable.
Drawings
FIG. 1 is a flow chart of a method for detecting air holes on a concrete surface according to the present invention;
FIG. 2 is a graph showing the results of example 1 provided by the present invention;
FIG. 3 is a graph showing the results of example 2 provided by the present invention;
FIG. 4 is a graph showing the results of example 3 provided by the present invention;
FIG. 5 is a graph showing the results of example 4 provided by the present invention;
FIG. 6 is a graph showing the results of example 5 provided by the present invention;
FIG. 7 is a graph showing the results of example 6 provided by the present invention;
FIG. 8 is a graph showing the results of comparative example 1 provided by the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to verify that the concrete surface pore detection method is superior to the existing concrete surface pore detection method, the two methods are subjected to comparative tests, and the examples are as follows:
example 1
The slurry for marking the pores on the surface of the concrete comprises raw materials of P.W 32.5 cement, a polycarboxylic acid water reducing agent, methyl cellulose ether, redispersible latex powder, distilled water and nano titanium dioxide, wherein the specific addition amounts of the P.W 32.5 cement 61%, the water reducing agent 0.5%, the methyl cellulose ether 0.5%, the redispersible latex powder 5%, the distilled water 25% and the nano titanium dioxide 8%. The raw materials are uniformly mixed according to the proportion and then are quickly stirred for 2min in a stirrer, so that the slurry is prepared.
The method for detecting the air holes on the surface of the concrete by using the slurry comprises the following steps:
s1, sweeping away the fragments on the surface of the concrete by using a soft brush, washing for 1min under flowing clear water, and removing the apparent water on the surface of the concrete by using a wet towel;
s2, uniformly coating the slurry on the surface of concrete by using a scraper, keeping the scraper and the surface of the concrete at an angle of 30 degrees, and scraping the slurry horizontally and vertically for 20 times respectively;
s3, after 1 hour, lightly wiping off excessive slurry in degassing holes on the surface of the concrete by using a wet towel;
s4, photographing and sampling the surface of the concrete by using a digital camera with high resolution;
s5, analyzing the pore size and the pore area of the marked pores on the concrete surface by using Image Pro Plus.
The concrete surface air hole marks and analysis results are shown in figure 2.
Example 2
The slurry for marking the pores on the surface of the concrete comprises raw materials of P.W 32.5 cement, a polycarboxylic acid water reducing agent, methyl cellulose ether, redispersible latex powder, distilled water and nano titanium dioxide, wherein the specific addition amounts of the P.W 32.5 cement, the polycarboxylic acid water reducing agent are 0.5%, the methyl cellulose ether is 0.5%, the redispersible latex powder is 2%, the distilled water is 20% and the nano titanium dioxide is 2%. The raw materials are uniformly mixed according to the proportion and then are quickly stirred in a stirrer for 3min to prepare the slurry.
The method for detecting the air holes on the surface of the concrete by using the slurry comprises the following steps:
s1, sweeping away scraps on the surface of the concrete by using a soft brush, washing for 3min under flowing clear water, and removing the clear water on the surface of the concrete by using a wet towel;
s2, uniformly coating the slurry on the surface of concrete by using a scraper, keeping the scraper and the surface of the concrete at 45 degrees, and scraping the slurry horizontally and vertically for 30 times respectively;
s3, after 0.5 hour, lightly wiping off excessive slurry in degassing holes on the surface of the concrete by using a wet towel;
s4, photographing and sampling the surface of the concrete by using a digital camera with high resolution;
s5, analyzing the pore size and the pore area of the marked pores on the concrete surface by using Image Pro Plus.
The concrete surface air hole marks and analysis results are shown in FIG. 3.
Example 3
The slurry for marking the pores on the surface of the concrete comprises raw materials of P.W 32.5 cement, a polycarboxylic acid water reducing agent, methyl cellulose ether, redispersible latex powder, distilled water and nano titanium dioxide, wherein the specific addition amounts of the P.W 32.5 cement, the polycarboxylic acid water reducing agent 1%, the methyl cellulose ether 1%, the redispersible latex powder 5%, the distilled water 25% and the nano titanium dioxide 10%. The raw materials are uniformly mixed according to the proportion and then are quickly stirred in a stirrer for 3min to prepare the slurry.
The method for detecting the air holes on the surface of the concrete by using the slurry comprises the following steps:
s1, sweeping away scraps on the surface of the concrete by using a soft brush, washing for 3min under flowing clear water, and removing the clear water on the surface of the concrete by using a wet towel;
s2, uniformly coating the slurry on the surface of concrete by using a scraper, keeping the scraper and the surface of the concrete at 60 degrees, and scraping the slurry horizontally and vertically for 30 times respectively;
s3, after 1.5 hours, lightly wiping off excessive slurry in degassing holes on the surface of the concrete by using a wet towel;
s4, photographing and sampling the surface of the concrete by using a digital camera with high resolution;
s5, analyzing the pore size and the pore area of the marked pores on the concrete surface by using Image Pro Plus.
The concrete surface air hole marks and analysis results are shown in FIG. 4.
Example 4
The slurry for marking the pores on the surface of the concrete comprises raw materials of alpha semi-hydrated gypsum, distilled water, methyl cellulose ether, redispersible latex powder and nano titanium dioxide, wherein the addition amounts of the raw materials are respectively 60% of the alpha semi-hydrated gypsum, 25% of the distilled water, 1% of the methyl cellulose ether, 4% of the redispersible latex powder and 10% of the nano titanium dioxide. The raw materials are uniformly mixed according to the proportion and then are quickly stirred for 2min in a stirrer, so that the slurry is prepared.
The method for detecting the air holes on the surface of the concrete by using the slurry comprises the following steps:
s1, sweeping away scraps on the surface of the concrete by using a soft brush, washing for 1-3 min under flowing clear water, and removing the clear water on the surface of the concrete by using a wet towel;
s2, uniformly coating the slurry on the surface of concrete by using a scraper, keeping the scraper and the surface of the concrete at an angle of 30 degrees, and scraping the slurry horizontally and vertically for 20 times respectively;
s3, after 0.5 hour, lightly wiping off excessive slurry in degassing holes on the surface of the concrete by using a wet towel;
s4, photographing and sampling the surface of the concrete by using a digital camera with high resolution;
s5, analyzing the pore size and the pore area of the marked pores on the concrete surface by using Image Pro Plus.
The concrete surface air hole marks and analysis results are shown in FIG. 5.
Example 5
The slurry for marking the pores on the surface of the concrete comprises raw materials of alpha semi-hydrated gypsum, distilled water, methyl cellulose ether, redispersible latex powder and nano titanium dioxide, wherein the addition amounts of the raw materials are respectively 60% of the alpha semi-hydrated gypsum, 35% of the distilled water, 0.5% of the methyl cellulose ether, 2.5% of the redispersible latex powder and 2% of the nano titanium dioxide. The raw materials are uniformly mixed according to the proportion and then are quickly stirred for 2min in a stirrer, so that the slurry is prepared.
The method for detecting the air holes on the surface of the concrete by using the slurry comprises the following steps:
s1, sweeping away scraps on the surface of the concrete by using a soft brush, washing for 1-3 min under flowing clear water, and removing the clear water on the surface of the concrete by using a wet towel;
s2, uniformly coating the slurry on the surface of concrete by using a scraper, keeping the scraper and the surface of the concrete at 60 degrees, and scraping the slurry horizontally and vertically for 30 times respectively;
s3, after 1 hour, lightly wiping off excessive slurry in degassing holes on the surface of the concrete by using a wet towel;
s4, photographing and sampling the surface of the concrete by using a digital camera with high resolution;
s5, analyzing the pore size and the pore area of the marked pores on the concrete surface by using Image Pro Plus.
The concrete surface air hole marks and analysis results are shown in FIG. 6.
Example 6
The slurry for marking the pores on the surface of the concrete comprises raw materials of alpha semi-hydrated gypsum, distilled water, methyl cellulose ether, redispersible latex powder and nano titanium dioxide, wherein the addition amounts of the alpha semi-hydrated gypsum, the distilled water are 25%, the methyl cellulose ether is 1%, the redispersible latex powder is 5% and the nano titanium dioxide is 4%. The raw materials are uniformly mixed according to the proportion and then are quickly stirred for 2min in a stirrer, so that the slurry is prepared.
The method for detecting the air holes on the surface of the concrete by using the slurry comprises the following steps:
s1, sweeping away scraps on the surface of the concrete by using a soft brush, washing for 1-3 min under flowing clear water, and removing the clear water on the surface of the concrete by using a wet towel;
s2, uniformly coating the slurry on the surface of concrete by using a scraper, keeping the scraper and the surface of the concrete at 60 degrees, and scraping the slurry horizontally and vertically for 30 times respectively;
s3, after 1.5 hours, lightly wiping off excessive slurry in degassing holes on the surface of the concrete by using a wet towel;
s4, photographing and sampling the surface of the concrete by using a digital camera with high resolution;
s5, analyzing the pore size and the pore area of the marked pores on the concrete surface by using Image Pro Plus.
The concrete surface air hole marks and analysis results are shown in FIG. 7.
Comparative example 1
After directly collecting images on the concrete surface by using a digital camera with high resolution, the aperture size of the air holes on the concrete surface and the area of the air holes on each square meter are analyzed by using Image Pro Plus according to the characteristic that the air holes and the concrete matrix have different colors.
The concrete surface porosity analysis results are shown in FIG. 8.
As can be seen from fig. 2 to 8, the two slurries for pore marking provided by the present invention have no significant difference in pore marking; compared with the prior art, the concrete surface pore detection method provided by the invention has the following advantages: before using Image Pro Plus for analysis, filling and marking the air holes by using the slurry, wherein the cementing and hardening speed of the slurry in the air holes is higher than that of other positions on the surface of the concrete except the air holes; the slurry is easy to wipe off and not easy to remain on other positions except the air holes on the surface of the concrete; the color of the slurry is obviously different from the inherent color of the concrete, the air hole is marked and then the appearance degree is higher, and the measurement accuracy is higher in image analysis.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The slurry for marking the air holes on the surface of the concrete is characterized by comprising the following raw materials in percentage by weight: 58 to 75 percent of P.W 32.5 cement, 0.5 to 1 percent of water reducing agent, 0.5 to 1 percent of methyl cellulose ether, 2 to 5 percent of redispersible latex powder, 20 to 25 percent of distilled water and 2 to 10 percent of nano titanium dioxide.
2. The slurry for marking the air holes on the surface of the concrete is characterized by comprising the following raw materials in percentage by weight: 60-65% of alpha semi-hydrated gypsum, 25-35% of distilled water, 0.5-1% of methyl cellulose ether, 2.5-5% of redispersible latex powder and 2-10% of nano titanium dioxide.
3. The slurry for marking concrete surface pores according to claim 1, wherein the water reducing agent is at least one of lignosulfonate water reducing agents, naphthalene-based superplasticizers, melamine-based superplasticizers, sulfamate-based superplasticizers, fatty acid-based superplasticizers, and polycarboxylate-based superplasticizers.
4. The slurry for marking pores on the surface of concrete according to claim 1 or 2, wherein the redispersible latex powder is a powder binder prepared by spray drying at least one of ethylene/vinyl acetate copolymer, vinyl acetate/vinyl versatate copolymer and acrylic acid copolymer, and polyvinyl alcohol is used as a protective colloid.
5. A preparation method of slurry for marking concrete surface pores is characterized in that the raw materials of claim 1 or 2 are uniformly mixed according to a proportion and then rapidly stirred in a stirrer for 2-3 min to prepare the slurry.
6. A concrete surface air hole detection method is characterized by comprising the following steps:
s1, sweeping away scraps on the surface of the concrete by using a soft brush, washing for 1-3 min under flowing clear water, and removing the clear water on the surface of the concrete by using a wet towel;
s2, uniformly coating the slurry of any one of claims 1 to 5 on the surface of concrete by using a scraper;
s3, after 0.5-1.5 hours, lightly wiping off excessive slurry in degassing holes on the surface of the concrete by using a wet towel;
s4, photographing and sampling the surface of the concrete by using a digital camera with high resolution;
s5, analyzing the pore size and the pore area of the marked pores on the concrete surface by using Image Pro Plus.
7. The method for detecting air holes on the surface of concrete according to claim 6, wherein the angle between the scraper and the surface of concrete is 30-60 ° in S2.
8. The method for detecting the air holes on the surface of the concrete according to claim 7, wherein the slurry is scraped off by using a scraper for 20 to 30 times in each of the horizontal direction and the vertical direction.
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| CN112301825A (en) * | 2020-10-30 | 2021-02-02 | 王晖 | Road and bridge engineering concrete crack control method |
| CN113248196A (en) * | 2021-04-16 | 2021-08-13 | 张健 | Preparation process of foamed cement capable of detecting internal cracking |
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