CN111268983A - Application of closed-cell vitrified micro bubbles and light gypsum mortar using same and easy to detect bubble hollowing - Google Patents
Application of closed-cell vitrified micro bubbles and light gypsum mortar using same and easy to detect bubble hollowing Download PDFInfo
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- CN111268983A CN111268983A CN201911214438.9A CN201911214438A CN111268983A CN 111268983 A CN111268983 A CN 111268983A CN 201911214438 A CN201911214438 A CN 201911214438A CN 111268983 A CN111268983 A CN 111268983A
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- gypsum mortar
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- C—CHEMISTRY; METALLURGY
- 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
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- C—CHEMISTRY; METALLURGY
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/14—Minerals of vulcanic origin
- C04B14/18—Perlite
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- C—CHEMISTRY; METALLURGY
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/027—Lightweight materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
Abstract
The invention discloses application of closed-cell vitrified micro bubbles and gypsum mortar using the same and easy to detect bubble hollowing, wherein the application refers to that the bubble hollowing of the gypsum mortar is easy to detect by adding the closed-cell vitrified micro bubbles; the content of the closed-pore vitrified micro bubbles accounts for 3-15% of the total weight of the gypsum mortar; if the open-cell perlite and the closed-cell vitrified micro bubbles are simultaneously added into the gypsum mortar, the ratio of the closed-cell vitrified micro bubbles is over 45 percent. The application of the closed-cell vitrified micro bubbles enables the bubble hollowing of the gypsum mortar to be easy to detect on site, facilitates on-site repair, and reduces the hidden danger that the bubble hollowing is difficult to repair after delivery of a house, so that the engineering quality problem occurs.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to application of closed-cell vitrified micro bubbles and light gypsum mortar using the same and easy to detect bubble hollowing.
Background
The use of gypsum mortar in interior wall plastering is becoming more and more common. When the gypsum mortar is applied to a concrete-poured wall surface, air bubbles are easy to form and empty. The diameters of the bubble hollows are different, the diameter of the small bubble hollows is several millimeters, and the diameter of the large bubble hollows is several centimeters. The bubbles will appear in the gypsum mortar construction process and swell to form small bags with different sizes. The correct construction method is to break the air bubbles and then fill the bubbles with gypsum mortar; however, in order to save time, the constructor often flattens the small bag which is bulged directly without breaking the air bubbles in the construction process, and as a result, the air bubbles are hollow behind the flattening point. If the bubble hollowing can be detected in time in the detection after the plastering project is finished, a worker can break the bubble hollowing point, then the bubble hollowing point is repaired by gypsum mortar, and the defects are treated before putty or other materials are applied to the wall surface. If these bubble hollows are not detected in the detection process of the currently used method, they can be covered by the subsequent wall material (putty, tile, wall cloth) leaving defects in the wall.
At present, the method for simply, quickly and effectively detecting hollowing in the gypsum mortar plastering project adopts a hollow hammer. The detection method is a detection method of hollowing and cracking adopted when cement mortar plastering is continuously used. Cement mortar plasters are frequently subject to separation of the plastered layer and the base material due to low bond strength, which separation can be easily detected with a hollow drum hammer. When the wall surface slides after plastering is finished, the hollow hammer generates crisp sound when sliding on a normal wall surface, namely a place without hollow drum; on the wall surface with the hollow drum, the sound generated when the hollow drum hammer slides is not crisp.
However, when the empty hammer is used for detecting the light gypsum mortar wall surface, detection omission occurs, namely, when the wall surface is detected, the sound emitted at the position with the empty drum or the bubble empty drum is not greatly different from the sound emitted at other positions without the empty drum or the bubble empty drum, so that the empty drum or the bubble empty drum cannot be completely detected. The reasons for this are mainly two, the first one is that the lightweight plastering gypsum has a large porosity, relatively low strength and no strong reflection of sound than cement mortar; the second reason is that lightweight plastering gypsum generally uses lightweight aggregate to reduce the volume weight, and some lightweight aggregate has a great effect of suppressing the reflection of sound.
If all hollowing or bubble hollowing cannot be completely detected by the method of the hollow hammer after plastering of the gypsum mortar is finished, the problems can not be repaired in time in the construction process, and the hidden danger of engineering quality is left.
The bubble hollowing in the gypsum mortar can be accurately detected by adopting an ultrasonic detector, but the detection method has high cost.
Disclosure of Invention
The invention provides application of closed-cell vitrified micro bubbles and light gypsum mortar using the closed-cell vitrified micro bubbles, wherein the light gypsum mortar is easy to detect bubble hollowing, most of bubble hollowing can be detected on site by adopting a hollowing hammer, and the light gypsum mortar can be repaired in time so as to avoid subsequent engineering quality problems.
The invention provides an application of closed-cell vitrified micro bubbles, which is to facilitate the detection of bubble hollowing of gypsum mortar; the content of the closed-pore vitrified micro bubbles accounts for 3-15% of the total weight of the gypsum mortar; if the open-cell perlite and the closed-cell vitrified micro bubbles are simultaneously added into the gypsum mortar, the ratio of the closed-cell vitrified micro bubbles is over 45 percent.
The particle size of the closed-pore vitrified micro bubbles is 0.5-1.5mm, and the bulk density is more than 100kg/m3The cylinder pressure strength is more than or equal to 200kPa, the heat conductivity coefficient is less than or equal to 0.070W/(m.K), the volume water absorption is less than or equal to 45 percent, and the volume floating rate is more than or equal to 80 percent.
The method for detecting the hollowing of the bubbles of the gypsum mortar is characterized in that when the wall surface after plastering is finished slides by using an empty drum hammer, a crisp sound is generated when the empty drum hammer slides on a normal wall surface, namely a place without the hollowing; on the wall surface with the air drum, the sound generated when the air drum hammer slides is not crisp, and the air drum of the gypsum mortar is detected by adding the closed-cell vitrified micro bubbles with specific mixing amount and using a sound distinguishing method, so that most of the air drum can be detected.
The gypsum mortar easy to detect the bubble hollowing also comprises semi-hydrated gypsum, fine sand, closed-pore vitrified micro-beads, dispersible latex powder, a retarder and a water-retaining agent.
The gypsum mortar easy to detect bubble hollowing is prepared from the following raw materials in parts by weight:
650-weight portions of hemihydrate gypsum and 900 portions of hemihydrate gypsum,
0-200 parts of fine sand,
30-150 parts of closed-cell vitrified micro-beads,
0 to 3 parts of dispersible latex powder,
0.25 to 3 portions of retarder,
0.5-5 parts of a water-retaining agent.
The semi-hydrated gypsum is calcined by-product of flue gas desulfurization technology of a thermal power plant, and the purity of the desulfurized gypsum is more than or equal to 85%.
The fine sand is selected from any one of natural river sand, lake sand, sea sand and machine-made sand, and the selected mesh number is 50-120 meshes.
The dispersible latex powder adopts one, two or three of ethylene-vinyl acetate copolymer, acrylic acid copolymer and polyvinyl alcohol.
The retarder adopts one or two of bone glue protein and sugar calcium gypsum retarder materials.
The water retention agent adopts hydroxyethyl methyl cellulose or hydroxypropyl methyl cellulose, and the viscosity of the water retention agent is 30000-200000 mPa.
The application of the closed-cell vitrified micro bubbles enables the bubble hollowing of the gypsum mortar to be easy to detect on site, facilitates on-site repair, and reduces the hidden danger that the bubble hollowing is difficult to repair after delivery of a house, so that the engineering quality problem occurs.
Description of the drawings:
FIG. 1: the section of the gypsum mortar bubble hollowing is schematic, and the wall and the plastering layer are not in proportion in the figure.
FIG. 2: example 1 empty drum figure.
FIG. 3: example 2 empty drum figure.
FIG. 4: example 3 empty drum figure.
FIG. 5: example 4 empty drum figure.
FIG. 6: comparative example 1 empty drum figure.
Detailed Description
Example 1
Providing gypsum mortar, weighing 30kg of closed-cell vitrified micro-beads, and comprising the following other components: 790kg of semi-hydrated gypsum, 180kg of fine sand, 1kg of retarder, 2kg of water-retaining agent and 1kg of dispersible emulsion powder;
adding water consumption with standard diffusivity into a stirrer, uniformly scattering a sample into water within 30s, and slowly stirring for 3min to obtain the required gypsum mortar;
cleaning the construction wall surface, removing floating dust, loose objects and various substances which are not beneficial to bonding, and filling and leveling deep seams and interfaces; installing gypsum ribs or making ash cakes to fix the manual scraping thickness, preferably 15 mm; and (3) manual plastering, namely, scraping the gypsum mortar, and polishing and smoothing the surface of the gypsum mortar if necessary.
Example 2
Providing gypsum mortar, weighing 100kg of closed-cell vitrified micro-beads, and comprising the following other components: 830kg of semi-hydrated gypsum, 70kg of fine sand, 1kg of retarder, 2kg of water-retaining agent and 1kg of dispersible emulsion powder;
adding water consumption with standard diffusivity into a stirrer, uniformly scattering a sample into water within 30s, and slowly stirring for 3min to obtain the required gypsum mortar;
cleaning the construction wall surface, removing floating dust, loose objects and various substances which are not beneficial to bonding, and filling and leveling deep seams and interfaces; installing gypsum ribs or making ash cakes to fix the manual scraping thickness, preferably 15 mm; and (3) manual plastering, namely, scraping the gypsum mortar, and polishing and smoothing the surface of the gypsum mortar if necessary.
Example 3
Providing gypsum mortar, weighing 45kg of closed-cell vitrified micro-beads and 55kg of open-cell perlite; other components are as follows: 830kg of semi-hydrated gypsum, 70kg of fine sand, 1kg of retarder, 2kg of water-retaining agent and 1kg of dispersible emulsion powder;
adding water consumption with standard diffusivity into a stirrer, uniformly scattering a sample into water within 30s, and slowly stirring for 3min to obtain the required gypsum mortar;
cleaning the construction wall surface, removing floating dust, loose objects and various substances which are not beneficial to bonding, and filling and leveling deep seams and interfaces; installing gypsum ribs or making ash cakes to fix the manual scraping thickness, preferably 15 mm; and (3) manual plastering, namely, scraping the gypsum mortar, and polishing and smoothing the surface of the gypsum mortar if necessary.
Example 4
Providing gypsum mortar, weighing 85kg of closed-cell vitrified micro-beads and 15kg of open-cell perlite; other components are as follows: 830kg of semi-hydrated gypsum, 70kg of fine sand, 1kg of retarder, 2kg of water-retaining agent and 1kg of dispersible emulsion powder;
adding water consumption with standard diffusivity into a stirrer, uniformly scattering a sample into water within 30s, and slowly stirring for 3min to obtain the required gypsum mortar;
cleaning the construction wall surface, removing floating dust, loose objects and various substances which are not beneficial to bonding, and filling and leveling deep seams and interfaces; installing gypsum ribs or making ash cakes to fix the manual scraping thickness, preferably 15 mm; and (3) manual plastering, namely, scraping the gypsum mortar, and polishing and smoothing the surface of the gypsum mortar if necessary.
Comparative example 1
A gypsum mortar was prepared by adding only open-cell perlite, replacing the whole amount of the original closed-cell microspheres with open-cell perlite, and formulating the other components as in example 3.
Method 1 for detecting empty drum: a detection instrument: an air drum hammer;
the method for detecting the air bubbles and hollowing of the gypsum mortar is characterized in that an air drum hammer is used for sliding and hitting the plastered wall surface, and the wall surface has crisp sound; if the local sound is not crisp, it is likely that bubbles will be empty, unlike other sounds. The method for detecting the bubble hollowing of the gypsum mortar can detect whether the bubble hollowing exists or not, and is convenient for on-site repair.
In the comparative example 1, the gypsum mortar provided only contains the open-pore perlite, when the wall is detected, the wall after plastering is glidingly hit by using the air drum hammer, and the sound emitted at the position with the empty drum or the bubble empty drum is not greatly different from the sound emitted at other positions without the empty drum or the bubble empty drum, so that all the empty drums or the bubble empty drums cannot be detected.
Detection of empty drum method 2: a detection instrument: an ultrasonic detector;
the ultrasonic detector adopts an ultrasonic wave flat measurement method to measure the internal hollowing of the gypsum mortar according to the difference of the ultrasonic wave velocity in the gypsum mortar. Through an ultrasonic detector, the ultrasonic wave speed value of the gypsum mortar wall surface without bubble hollowing is 2.5-2.8 m/s; the ultrasonic wave speed of the gypsum mortar wall surface generating the bubble hollowing is 1.8-2.2 m/s.
Detection example 1: construction area: height 1.7m, width 1.2m, total 2.04m2。
The ultrasonic detector can detect the empty drum 10, the empty drum hammer can detect the empty drum hammer 8, and the probability of the empty drum hammer detection is 80%. The average empty drum is 2.5cm, and the maximum empty drum is 3.5 cm. The empty drum size is respectively: 3cm, 2cm, 3cm, 1cm, 2cm, 3.5cm, 3cm, 2cm, 3.5 cm.
Detection example 2: construction area: 2.2m high and 1.2m wide, 2.64m in total2。
The ultrasonic detector can detect 15 positions, the empty hammer can detect 15 positions, the detection probability of the empty hammer is 100%, the average empty drum is 3.2cm, and the maximum empty drum is 6 cm. The empty drum size is respectively: 3cm, 2.5cm, 4.5cm, 3cm, 2.5cm, 4cm, 3cm, 2.5cm, 2cm, 3.5cm, 2cm, 6cm, 3 cm.
Detection example 3: construction area: height 1.4m, width 0.85m, total 1.19m2。
The ultrasonic detector can detect 16 parts of the empty drums, 13 parts of the empty drums, the probability of detecting the empty drums is 81 percent, the average empty drum is 2.8cm, and the maximum empty drum reaches 5 cm. The empty drum size is respectively: 3cm, 3.5cm, 2cm, 3cm, 3.5cm, 2cm, 3.5cm, 5cm, 2.5cm, 3cm, 2.5cm, 4cm, 2 cm.
Detection example 4: construction area: 1.6m high and 1.2m wide, 1.92m total2。
The ultrasonic detector can detect the empty drum 15, the empty drum hammer can detect the empty drum 13, the detection probability of the empty drum hammer is 87 percent, the average empty drum is 3.1cm, and the maximum empty drum is 6 cm. The empty drum size is respectively: 3.5cm, 2.5cm, 3.5cm, 3cm, 4cm, 2cm, 2.5cm, 3cm, 2.5cm, 2cm, 5cm, 6cm, 3cm
Comparative example 1 was tested: construction area: height 1.7m, width 1.1m, total 1.87m2。
The ultrasonic detector can detect the empty drum 17, the empty drum hammer can detect 6, the probability of the empty drum hammer can be detected is 35%, the average empty drum is 2.8m, and the maximum empty drum is 5 cm. The empty drum size is respectively: 5cm, 3cm, 2.5cm, 4cm, 2cm, 4cm, 3.5cm, 1.5cm, 3cm, 2.5cm, 2 cm.
Claims (9)
1. The application of the closed-cell vitrified micro bubbles is characterized in that the closed-cell vitrified micro bubbles are added to ensure that the bubble hollowing of the gypsum mortar is easy to detect; the content of the closed-pore vitrified micro bubbles accounts for 3-15% of the total weight of the gypsum mortar; if the open-cell perlite and the closed-cell vitrified micro bubbles are simultaneously added into the gypsum mortar, the ratio of the closed-cell vitrified micro bubbles is more than 45 percent; the particle size of the closed-pore vitrified micro bubbles is 0.5-1.5mm, and the bulk density is more than 100kg/m3The cylinder pressure strength is more than or equal to 200kPa, the heat conductivity coefficient is less than or equal to 0.070W/(m.K), the volume water absorption is less than or equal to 45 percent, and the volume floating rate is more than or equal to 80 percent. The open-cell perlite and the closed-cell microspheres are mainly distinguished in terms of loose volume weight, and the larger the loose volume weight is, the higher the content of the closed-cell microspheres is, and the lower the content of the open-cell perlite is; conversely, the smaller the bulk volume weight, the lower the closed cell bead content and the higher the open cell perlite content, but both open cell perlite and closed cell vitrified beads may be present.
2. The application of the method as claimed in claim 1, wherein the method for detecting the air bubbles of the gypsum mortar is to use an air drum hammer to slide and hit the plastered wall surface, and the wall surface has crisp sound; if the local sound is not crisp, it is likely that bubbles will be empty, unlike other sounds.
3. The gypsum mortar easy to detect air bubble hollowing obtained by the application of claim 1, further comprising semi-hydrated gypsum, fine sand, closed-pore vitrified micro-beads, dispersible emulsion powder, retarder and water-retaining agent.
4. The gypsum mortar easy to detect bubble hollowing according to claim 3, wherein the gypsum mortar easy to detect bubble hollowing is prepared from the following raw materials in parts by weight:
650-weight portions of hemihydrate gypsum and 900 portions of hemihydrate gypsum,
0-200 parts of fine sand,
30-150 parts of closed-cell vitrified micro-beads,
0 to 3 parts of dispersible latex powder,
0.25 to 3 portions of retarder,
0.5-5 parts of a water-retaining agent.
5. The gypsum mortar easy to detect bubble hollowing according to claim 4, wherein the semi-hydrated gypsum is calcined by-product desulfurized gypsum of flue gas desulfurization of a thermal power plant, and the purity of the desulfurized gypsum is not less than 85%.
6. The gypsum mortar easy to detect bubble hollowing according to claim 4, wherein the fine sand is selected from any one of natural river sand, lake sand, sea sand and machine-made sand, and the fine sand has a particle size range of 50-120 mesh.
7. The gypsum mortar easy to detect air bubble hollowing of claim 4, wherein the dispersible latex powder adopts one, two or three of ethylene-vinyl acetate copolymer, acrylic acid copolymer and polyvinyl alcohol.
8. The gypsum mortar easy to detect air bubble hollowing of claim 4, wherein the retarder adopts one or two of bone glue protein and sugar calcium gypsum retarder materials.
9. The gypsum mortar easy to detect air bubble hollowing as claimed in claim 4, wherein the water retention agent is one or two of hydroxyethyl methyl cellulose and hydroxypropyl methyl cellulose, and the viscosity of the water retention agent is 30000-200000mPa s.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114685135A (en) * | 2022-05-10 | 2022-07-01 | 江苏吉邦材料科技有限公司 | Light gypsum mortar with high coating rate |
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