CN114873974A - Anti-crack bonding mortar for autoclaved aerated concrete slab and preparation method thereof - Google Patents
Anti-crack bonding mortar for autoclaved aerated concrete slab and preparation method thereof Download PDFInfo
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- CN114873974A CN114873974A CN202210643445.6A CN202210643445A CN114873974A CN 114873974 A CN114873974 A CN 114873974A CN 202210643445 A CN202210643445 A CN 202210643445A CN 114873974 A CN114873974 A CN 114873974A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 45
- 239000004567 concrete Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000002156 mixing Methods 0.000 claims abstract description 43
- 238000003756 stirring Methods 0.000 claims abstract description 42
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 36
- 239000011812 mixed powder Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000005303 weighing Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 33
- 239000000843 powder Substances 0.000 claims description 22
- 229920000126 latex Polymers 0.000 claims description 19
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 18
- 239000004816 latex Substances 0.000 claims description 17
- 230000008719 thickening Effects 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 11
- 229920002472 Starch Polymers 0.000 claims description 9
- 229920003086 cellulose ether Polymers 0.000 claims description 9
- 239000008107 starch Substances 0.000 claims description 9
- 235000019698 starch Nutrition 0.000 claims description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 7
- 239000011707 mineral Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 3
- 239000005977 Ethylene Substances 0.000 claims description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 3
- 229910021487 silica fume Inorganic materials 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims 1
- 238000005336 cracking Methods 0.000 abstract description 11
- 239000004566 building material Substances 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 9
- 206010016807 Fluid retention Diseases 0.000 description 8
- 238000011056 performance test Methods 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
-
- 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
- C04B28/02—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
- C04B28/04—Portland cements
-
- 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
- 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
- C04B2111/00637—Uses not provided for elsewhere in C04B2111/00 as glue or binder for uniting building or structural materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to the technical field of building materials, in particular to anti-crack bonding mortar for an autoclaved aerated concrete slab and a preparation method thereof. And weighing mixing water and a water reducing agent. And adding mixing water into the mixed powder for stirring, and adding a water reducing agent into the mixed powder for continuous stirring in the stirring process to obtain the anti-crack bonding mortar. Through detection, the transverse deformation of the anti-crack bonding mortar is more than or equal to 3mm, the cracking index is 0mm, the water retention rate is more than or equal to 99%, and the tensile bonding strength is more than or equal to 0.5 MPa. The crack resistance is improved by more than 50% compared with that of common crack-resistant bonding mortar, and the overall performance and the use safety of the autoclaved aerated concrete slab joint can be obviously improved.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to anti-crack bonding mortar for an autoclaved aerated concrete slab and a preparation method thereof.
Background
With the continuous development of national fabricated buildings, autoclaved aerated concrete slabs (ALC slabs for short) become building materials with wide application due to the advantages of light weight, environmental protection, fire prevention, self heat preservation, energy conservation, convenience in installation and the like. When ALC board construction is carried out, bonding mortar is often adopted to improve the bonding capability between ALC boards. In project practice, most of the cracking of the wallboard is caused by cracking of the bonding mortar, so that the cracking of the wall surface is caused. In addition, due to the specific porous structure and water absorption property of the ALC board, water in mortar is easily absorbed, so that cement solidification is insufficient, the bonding strength and the compressive strength are reduced, and the normal performance of the wall body function is seriously influenced.
The common crack-resistant autoclaved aerated concrete slab has poor cracking resistance, water retention and bonding strength, and the installation quality and the use safety of the bonding mortar to the slab are influenced.
Disclosure of Invention
In view of the above, it is necessary to provide an anti-cracking bonding mortar for autoclaved aerated concrete panels, which has good anti-cracking performance, water retention property and bonding strength, and a preparation method thereof.
A preparation method of anti-crack bonding mortar for autoclaved aerated concrete slabs comprises the following steps:
uniformly stirring the cementing material, the water-retaining thickening material, the fine aggregate and the redispersible latex powder to obtain mixed powder; the water-retaining thickening material comprises, by mass, 200-350 parts of a cementing material and 0-2 parts of a water-retaining thickening material; the mass portion of the fine aggregate is 650-680 parts, and the mass portion of the redispersible latex rubber material is 10-20 parts;
weighing mixing water and a water reducing agent; the mixing water comprises, by mass, 145-175 parts of mixing water and 2-3 parts of a water reducing agent;
and adding the mixing water into the mixed powder for stirring, and adding the water reducing agent into the mixed powder for continuous stirring in the stirring process to obtain the anti-crack bonding mortar.
Further, the method comprises the following steps of uniformly stirring the cementing material, the water-retaining thickening material, the fine aggregate and the redispersible latex powder to obtain a mixed powder material, wherein the mixed powder material comprises:
and stirring the mixed powder for 5-10 min by a stirrer.
Further, the step of adding the mixing water into the mixed powder for stirring, and the step of adding the water reducing agent into the mixed powder for continuous stirring during the stirring process to obtain the anti-crack bonding mortar comprises the following steps:
and mixing and stirring the mixing water, the mixed powder and the water reducing agent for 3-5 min by a stirrer.
Further, the volume of the anti-crack bonding mortar accounts for 30-70% of the capacity of the stirrer.
Furthermore, the cementing material comprises cement and a mineral admixture, wherein the mineral admixture is one of fly ash, silica fume and mineral powder.
Furthermore, the fine aggregate is river sand or machine-made sand with the particle size of less than 0.6 mm.
Further, the water-retaining thickening material adopts one or the combination of two of cellulose ether and starch ether.
Further, the redispersible latex powder adopts vinyl acetate and ethylene copolymerized rubber powder.
Further, the water reducing agent is a polycarboxylic acid water reducing agent.
The anti-crack bonding mortar for the autoclaved aerated concrete slab is prepared by adopting any one of the preparation methods.
According to the anti-crack bonding mortar for the autoclaved aerated concrete slab and the preparation method thereof, the cementing material, the water-retaining thickening material, the fine aggregate and the redispersible latex powder are uniformly stirred to obtain the mixed powder. And weighing mixing water and a water reducing agent. And adding mixing water into the mixed powder for stirring, and adding a water reducing agent into the mixed powder for continuous stirring in the stirring process to obtain the anti-crack bonding mortar. Through detection, the transverse deformation of the anti-crack bonding mortar is more than or equal to 3mm, the cracking index is 0mm, the water retention rate is more than or equal to 99%, and the tensile bonding strength is more than or equal to 0.5 MPa. The crack resistance is improved by more than 50% compared with that of common crack-resistant bonding mortar, and the overall performance and the use safety of the autoclaved aerated concrete slab joint can be obviously improved.
Drawings
Fig. 1 is a flow chart of a preparation method of the anti-crack bonding mortar for the autoclaved aerated concrete slab according to one embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a preparation method of the anti-crack bonding mortar for the autoclaved aerated concrete slab comprises the following steps:
step S110: and uniformly stirring the cementing material, the water-retaining thickening material, the fine aggregate and the redispersible latex powder to obtain the mixed powder.
And uniformly mixing the cementing material, the water-retention thickening material, the fine aggregate and the redispersible latex powder by a mixer according to the proportion, wherein the mixing time is 5-10 min. The cementing material comprises, by mass, 200-350 parts of cement and a mineral admixture, wherein the admixture is one of fly ash, silica fume and mineral powder. The water-retaining thickening material is 1-2 parts by weight, and one or a combination of cellulose ether and starch ether is adopted. The fine aggregate is 650-800 parts by mass, and river sand or machine-made sand with the particle size of below 0.6mm is adopted. 10-20 parts of redispersible latex powder, and vinyl acetate and ethylene copolymerized rubber powder.
Step S120: and weighing mixing water and a water reducing agent.
Weighing mixing water and a water reducing agent according to a proportion, wherein the weighed mixing water accounts for 145-175 parts by mass, the water reducing agent accounts for 2-3 parts by mass, and the water reducing agent is a polycarboxylic acid water reducing agent.
Step S130: and adding mixing water into the mixed powder for stirring, and adding a water reducing agent into the mixed powder for continuous stirring in the stirring process to obtain the anti-crack bonding mortar.
And (3) adding the mixed powder prepared in the step (110) into the mixing water weighed in the step (S120), mechanically stirring by using a stirrer, adding a water reducing agent in proportion in the stirring process, and continuously and uniformly mixing to obtain the anti-crack bonding mortar, wherein the stirring time is 3-5 min, and the stirring amount is 30-70% of the capacity of the stirrer.
The preparation of an anti-crack bonding mortar for autoclaved aerated concrete panels is first further illustrated by examples 1 to 3.
Example 1:
the anti-crack bonding mortar for the autoclaved aerated concrete slab comprises the following components in parts by mass: 250 parts of P.042.5 cement, 740 parts of river sand with the particle size of less than 0.6mm, 1 part of cellulose ether, 0.5 part of starch ether, 10 parts of redispersible latex powder, 3 parts of polycarboxylic acid water reducing agent and 160 parts of blending water.
The preparation method comprises the following steps:
(1) and mixing the P.042.5 cement, the cellulose ether, the starch ether, the river sand and the redispersible latex powder for 8min by using a stirrer according to the proportion to obtain mixed powder.
(2) And weighing the water for mixing and the polycarboxylic acid water reducing agent according to the proportion respectively.
(3) And (3) adding the mixed powder prepared in the step (1) into the mixing water weighed in the step (2), mechanically stirring for 4min by using a stirrer, adding a polycarboxylic acid water reducing agent in proportion in the stirring process, and continuously and uniformly mixing to obtain the anti-crack bonding mortar.
Example 2:
the anti-crack bonding mortar for the autoclaved aerated concrete slab comprises the following components in parts by mass: 320 parts of P.042.5 cement, 30 parts of fly ash, 650 parts of machine-made sand with the particle size of less than 0.6mm, 2 parts of cellulose ether/starch ether, 20 parts of redispersible latex powder, 2 parts of polycarboxylic acid water reducing agent and 145 parts of mixing water.
The preparation method comprises the following steps:
(1) and mixing the P.042.5 cement, the fly ash, the cellulose ether/starch ether, the machine-made sand and the redispersible latex powder for 10min by a stirrer according to the proportion to obtain mixed powder.
(2) And weighing the water for mixing and the polycarboxylic acid water reducing agent according to the proportion respectively.
(3) And (3) adding the mixed powder prepared in the step (1) into the mixing water weighed in the step (2), mechanically stirring for 5min by using a stirrer, adding a polycarboxylic acid water reducing agent in proportion in the stirring process, and continuously and uniformly mixing to obtain the anti-crack bonding mortar.
Example 3:
the anti-crack bonding mortar for the autoclaved aerated concrete slab comprises the following components in parts by mass: 200 parts of P.042.5 cement, 800 parts of river sand with the particle size of less than 0.6mm, 1 part of cellulose ether/starch ether, 15 parts of redispersible latex powder, 2 parts of polycarboxylic acid water reducing agent and 175 parts of mixing water.
The preparation method comprises the following steps:
(1) and mixing the P.042.5 cement, the cellulose ether/starch ether, the river sand and the redispersible latex powder for 5min by a stirrer according to the proportion to obtain mixed powder.
(2) And weighing the water for mixing and the polycarboxylic acid water reducing agent according to the proportion respectively.
(3) And (3) adding the mixed powder prepared in the step (1) into the mixing water weighed in the step (2), mechanically stirring for 3min by using a stirrer, adding a polycarboxylic acid water reducing agent in proportion in the stirring process, and continuously and uniformly mixing to obtain the anti-crack bonding mortar.
And secondly, performing performance tests of crack resistance, water retention and tensile bonding strength on the crack-resistant bonding mortar prepared in the embodiments 1 to 3, wherein the performance tests comprise a transverse deformation test, a crack index test, a water retention test and a tensile bonding strength test.
Wherein, the transverse deformation test is carried out by adopting a method specified in ceramic tile adhesive JC/T547-2017. The cracking index test is carried out by adopting a method specified in cement mortar cracking resistance test method JC/T951-2005. The water retention property test is carried out by adopting a method specified in 'building mortar basic performance test method' JGJ/T70-2009. The tensile bonding strength with the autoclaved aerated concrete is formed by a method specified in JC/T985-plus 2005 of Cement-based self-leveling mortar for the ground, wherein the size of a test piece of the autoclaved aerated concrete base is 400 multiplied by 200 multiplied by 75mm, the coating size of the anti-crack bonding mortar is 50 multiplied by 3mm, the number of the test pieces is 10 per group, and the curing period is 14 days.
The results are shown in table 1:
TABLE 1
In conclusion, according to the anti-crack bonding mortar for the autoclaved aerated concrete slab and the preparation method thereof, the cementing material, the water-retaining thickening material, the fine aggregate and the redispersible latex powder are uniformly stirred to obtain the mixed powder. And weighing mixing water and a water reducing agent. And adding mixing water into the mixed powder for stirring, and adding a water reducing agent into the mixed powder for continuous stirring in the stirring process to obtain the anti-crack bonding mortar. Through detection, the transverse deformation of the anti-crack bonding mortar is more than or equal to 3mm, the cracking index is 0mm, the water retention rate is more than or equal to 99%, and the tensile bonding strength is more than or equal to 0.5 MPa. The crack resistance is improved by more than 50% compared with that of common crack-resistant bonding mortar, and the overall performance and the use safety of the autoclaved aerated concrete slab joint can be obviously improved.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. A preparation method of anti-crack bonding mortar for autoclaved aerated concrete slabs is characterized by comprising the following steps:
uniformly stirring the cementing material, the water-retaining thickening material, the fine aggregate and the redispersible latex powder to obtain mixed powder; the water-retaining thickening material comprises, by mass, 200-350 parts of a cementing material and 0-2 parts of a water-retaining thickening material; the mass portion of the fine aggregate is 650-680 parts, and the mass portion of the redispersible latex rubber material is 10-20 parts;
weighing mixing water and a water reducing agent; the mixing water comprises, by mass, 145-175 parts of mixing water and 2-3 parts of a water reducing agent;
and adding the mixing water into the mixed powder for stirring, and adding the water reducing agent into the mixed powder for continuous stirring in the stirring process to obtain the anti-crack bonding mortar.
2. The method of claim 1, wherein the cementitious material, the water-retaining thickening material, the fine aggregate and the redispersible latex powder are uniformly stirred to obtain a mixed powder material, comprising:
and stirring the mixed powder for 5-10 min by a stirrer.
3. The method according to claim 2, wherein the step of adding the mixing water into the mixed powder for stirring is carried out, the water reducing agent is added during stirring, and stirring is continued to obtain the anti-crack bonding mortar, and comprises the following steps:
and mixing and stirring the mixing water, the mixed powder and the water reducing agent for 3-5 min by a stirrer.
4. The method of claim 3, wherein the volume of the anti-crack bonding mortar is 30% to 70% of the capacity of the mixer.
5. The method of claim 1, wherein the cementitious material comprises cement and a mineral admixture selected from the group consisting of fly ash, silica fume, and mineral fines.
6. The method according to claim 1, wherein the fine aggregate is river sand or machine-made sand having a particle size of 0.6mm or less.
7. The method of claim 1, wherein the water-retaining thickening material is one or a combination of cellulose ether and starch ether.
8. The method of claim 1 wherein the redispersible latex powder is a copolymer powder of vinyl acetate and ethylene.
9. The method of claim 1, wherein the water reducing agent is a polycarboxylic acid water reducing agent.
10. An anti-crack bonding mortar for autoclaved aerated concrete slabs is characterized by being prepared by the preparation method of any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210643445.6A CN114873974A (en) | 2022-06-09 | 2022-06-09 | Anti-crack bonding mortar for autoclaved aerated concrete slab and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210643445.6A CN114873974A (en) | 2022-06-09 | 2022-06-09 | Anti-crack bonding mortar for autoclaved aerated concrete slab and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116283130A (en) * | 2023-02-13 | 2023-06-23 | 华润水泥技术研发有限公司 | Low-cost white ALC special adhesive mortar and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104326718A (en) * | 2014-10-24 | 2015-02-04 | 河南兴安新型建筑材料有限公司 | Adhesive mortar for lautoclaved lightweight concrete panel |
| CN104692731A (en) * | 2015-02-28 | 2015-06-10 | 广州大学 | Polymer anti-cracking mortar, and preparation method and application thereof |
| CN111039625A (en) * | 2019-12-28 | 2020-04-21 | 陕西凝远新材料科技股份有限公司 | Special bonding mortar for aerated concrete insulation board |
-
2022
- 2022-06-09 CN CN202210643445.6A patent/CN114873974A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104326718A (en) * | 2014-10-24 | 2015-02-04 | 河南兴安新型建筑材料有限公司 | Adhesive mortar for lautoclaved lightweight concrete panel |
| CN104692731A (en) * | 2015-02-28 | 2015-06-10 | 广州大学 | Polymer anti-cracking mortar, and preparation method and application thereof |
| CN111039625A (en) * | 2019-12-28 | 2020-04-21 | 陕西凝远新材料科技股份有限公司 | Special bonding mortar for aerated concrete insulation board |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116283130A (en) * | 2023-02-13 | 2023-06-23 | 华润水泥技术研发有限公司 | Low-cost white ALC special adhesive mortar and preparation method thereof |
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Application publication date: 20220809 |