CN115490454A - Slow-release plastic stabilizing agent for wet-mixed mortar - Google Patents
Slow-release plastic stabilizing agent for wet-mixed mortar Download PDFInfo
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- CN115490454A CN115490454A CN202211152890.9A CN202211152890A CN115490454A CN 115490454 A CN115490454 A CN 115490454A CN 202211152890 A CN202211152890 A CN 202211152890A CN 115490454 A CN115490454 A CN 115490454A
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- slow
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- mixed 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
Abstract
The invention discloses a slow-release plastic stabilizing agent for wet-mixed mortar. The slow-release plastic stabilizer for the wet-mixed mortar is prepared by mixing a polycarboxylic acid water reducer powder, an air entraining component, a foam stabilizing component, a water retention component and a modified delayed-setting slow-release component; the modified slow-release retarding component is obtained by uniformly mixing glycerol and sodium pyrophosphate to form a slow-release retarding component, adding the slow-release retarding component into a sodium silicate solution, heating and quenching the slow-release retarding component, finally air-drying and forming the slow-release retarding component under the wind-heat condition, and quickly carrying out air-cooling and shaping. According to the invention, through slow dissolution of the sodium silicate hollow microspheres, the retarding component filled in the hollow space is gradually released, the plastic-retaining time of the wet-mixed mortar can be well controlled, the plastic-retaining effect of the wet-mixed mortar is greatly prolonged, the effects of water retention, thickening and viscosity reduction can be achieved, the water retention and workability of the mortar are improved, the constructability of the mixed mortar is improved, the construction is convenient, the construction efficiency is improved, and meanwhile, the cohesiveness of mortar aggregate and slurry can be improved by dissolving the sodium silicate microspheres, and the mechanical property of the mortar is improved.
Description
Technical Field
The invention belongs to the technical field of building material additives, and particularly relates to a slow-release plastic stabilizer for wet-mixed mortar.
Background
With the improvement of the environmental protection requirement of China, the phenomenon is gradually reduced because the stirring dust pollution on the mortar construction site is serious, the substituted wet-mixed mortar is rapidly developed, the wet-mixed mortar needs to be ensured to have good construction performance when being transported to the construction site, and the use of the wet-mixed mortar plasticity stabilizer cannot be avoided in order to ensure that the wet-mixed mortar has good construction performance. The wet-mixed mortar plasticity stabilizer is an additive for improving the workability of a mixture of wet-mixed mortar and prolonging the plasticity preservation time of the mixture, generally comprises a water preservation component, a water reduction component, a retarding component, a strength enhancement component, an air entraining component and the like, and researches on various wet-mixed mortar plasticity stabilizers according to the application requirements of the wet-mixed mortar by researchers at present.
Patent CN113979666B provides a double-doped wet-mixed mortar additive, which is prepared from the following raw materials in parts by weight: the component A comprises 8-13 parts of water-retaining agent, 5-8 parts of thickening agent, 1-3 parts of plastic-retaining additive, 1.5-4.5 parts of strength-enhancing component and 1-3 parts of air-entraining component; the component B comprises 10-15 parts of polycarboxylic acid water reducing agent, 5-10 parts of retarder and 0.1-0.2 part of preservative; and starch, sodium alginate, polyvinyl alcohol and acrylic acid acrylamide are subjected to cross-linking polymerization to prepare the water-retaining auxiliary agent with the high-water-absorptivity natural polymer interpenetrating network structure, the structure can effectively lock water, the effects of water retention and water locking are achieved, the auxiliary enhancement effect is achieved on the performance of the water-retaining agent, the initial setting time can reach 39h, and the plastic-retaining time is within 39 h.
Patent CN111960720A provides a cold-resistant high-water-retention wet-mixed mortar plasticizer stabilizer and a preparation method thereof, and the plasticizer stabilizer is prepared from the following raw materials in percentage by weight: 15-25% of water reducing agent, 8-15% of early strength admixture, 4-10% of retarder, 1-5% of water-retaining self-made auxiliary agent, 0.1-0.3% of antifreezing agent, 0.1-0.6% of sodium dodecyl benzene sulfonate and the balance of water. The water retention aid is prepared by selecting and proportioning the components such as the water reducing agent, the retarder, the air entraining agent, the early strength agent and the like in a proper manner and using the natural high molecular material sodium alginate, and the water retention aid and the antifreezing agent have synergistic effects to jointly realize the efficient plastic stabilization effect of the wet-mixed mortar plastic stabilization agent. The setting time can reach 29h, and the plastic retention time is less than 29h.
CN111302699B provides a wet-mixed mortar plasticity-maintaining agent, which is composed of the following raw materials: high-substitution cationic starch, a water reducing agent, inorganic salt, rice flour, cellulose ether, sodium gluconate and an air entraining agent. The invention provides plasticity retention for the mortar by adding high-substituted cationic starch and assisting inorganic salt (mainly nitrate). However, the plastic retention agent provided by the patent is mainly used for mixed mortar prepared by cement mixing viscosity, and the plastic retention time is 4' 6h.
From the current researches, the current wet-mixed mortar plasticity-maintaining agent is prepared by compounding multiple components, and the extension of the wet-mixed mortar plasticity-maintaining time is realized through the respective effects of different functional components on cement, but the wet-mixed mortar plasticity-maintaining agent which is used for ultra-long construction time requirements, such as 36h or even 48h requirements, is lacked.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a slow-release plasticity-stabilizing agent for wet-mixed mortar, which can greatly prolong the moisture retention time of the wet-mixed mortar, improve the workability of the wet-mixed mortar and improve the construction efficiency when used for the wet-mixed mortar.
In order to solve the technical problems, the invention adopts the following technical scheme:
the slow-release plastic stabilizer for the wet-mixed mortar is obtained by uniformly mixing the following components in parts by weight:
the preparation method of the modified slow-setting and slow-release component comprises the following steps: firstly, uniformly mixing glycerol and sodium pyrophosphate to form a retarding component, and adding the retarding component into a sodium silicate solution with the modulus of not less than 2.0 to obtain a mixed solution; then heating to 100-300 ℃, pouring the mixed solution into liquid nitrogen for quenching; finally, the cooled particles are air-dried and molded for 5 to 15min under the wind-heat condition of 300 to 1000 ℃, and then air-cooled and molded rapidly to obtain the sodium silicate hollow microsphere particles, namely the modified slow-setting slow-release component.
The mass ratio of the glycerol to the sodium pyrophosphate is 1;
the mass ratio of the sodium silicate to the retarding component is 1-1;
the specific surface area of the modified slow-release component is 300-600 kg/m 3 。
The water retention component is obtained by uniformly mixing hydroxyethyl cellulose ether and polyacrylamide according to a mass ratio of 8-4.
The foam stabilizing component is triethanolamine or calcium stearate.
The air entraining component is triterpenoid saponin.
The invention has the following beneficial effects:
compared with the prior art, the modified slow-release retarding component is prepared, the slow dissolution of the sodium silicate hollow microspheres obtained by air cooling shaping is carried out, the slow-release retarding component filled in the hollow space is gradually released, the plastic-retaining time of the wet-mixed mortar can be well controlled, the plastic-retaining effect of the wet-mixed mortar is greatly prolonged, the effects of water retention, thickening and viscosity reduction can be achieved, the water retention and the workability of the mortar are improved, the constructability of the mixed mortar is improved, the construction is convenient, the construction efficiency is improved, meanwhile, the cohesiveness of mortar aggregate and slurry can be improved by dissolving the sodium silicate microspheres, and the mechanical property of the mortar is improved.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail. This invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided to explain the principles of the invention and its practical application to thereby enable others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated.
The following examples and comparative examples use the components in parts by weight.
Example 1
The invention relates to a preparation method of a slow-release plasticity-stabilizing agent for wet-mixed mortar, which comprises the following steps: weighing 0.5 part of polycarboxylic acid water reducer powder, 0.2 part of triterpenoid saponin, 0.1 part of triethanolamine, 5 parts of water retention component and 4 parts of modified delayed-setting slow-release component, and uniformly mixing the components to obtain a slow-release plastic stabilizer for wet-mixed mortar;
the water retention component is obtained by uniformly mixing hydroxyethyl cellulose ether and polyacrylamide according to a mass ratio of 8;
the preparation method of the modified slow-setting and slow-release component comprises the following steps: uniformly mixing glycerol and sodium pyrophosphate according to a mass ratio of 1; the mass ratio of the sodium silicate to the retarding component is 1.
Example 2
The invention relates to a preparation method of a slow-release plasticity-stabilizing agent for wet-mixed mortar, which comprises the following steps: weighing 1 part of polycarboxylic acid water reducing agent powder, 0.05 part of triterpenoid saponin, 1.5 parts of calcium stearate, 3 parts of water retention component and 15 parts of modified slow-release retarding component, and uniformly mixing the components to obtain the slow-release plastic stabilizing agent for wet-mixed mortar.
The water retention component is obtained by uniformly mixing hydroxyethyl cellulose ether and polyacrylamide according to a mass ratio of 4;
the preparation method of the modified slow-setting and slow-release component comprises the following steps: uniformly mixing glycerol and sodium pyrophosphate according to a mass ratio of 6; the mass ratio of the sodium silicate to the retarding component is 1.
Example 3
The invention relates to a preparation method of a slow-release plasticity-stabilizing agent for wet-mixed mortar, which comprises the following steps: weighing 0.8 part of polycarboxylic acid water reducing agent powder, 0.1 part of triterpenoid saponin, 1 part of triethanolamine, 4 parts of water retention component and 10 parts of modified slow-setting slow-release component, and uniformly mixing the components to obtain a slow-release plastic stabilizer for wet-mixed mortar;
the water retention component is obtained by uniformly mixing hydroxyethyl cellulose ether and polyacrylamide according to a mass ratio of 6;
the preparation method of the modified slow-setting and slow-release component comprises the following steps: uniformly mixing glycerol and sodium pyrophosphate according to a mass ratio of 1; the mass ratio of the sodium silicate to the retarding component is 1:10.
example 4
The invention relates to a preparation method of a wet-mixed mortar slow-release plasticity-stabilizing agent, which comprises the following steps: weighing 0.7 part of polycarboxylic acid water reducing agent powder, 0.08 part of triterpenoid saponin, 1.2 parts of calcium stearate, 3.5 parts of water retention component and 12 parts of modified delayed-setting slow-release component, and uniformly mixing the components to obtain a slow-release plastic stabilizer for wet-mixed mortar;
the water retention component is obtained by uniformly mixing hydroxyethyl cellulose ether and polyacrylamide according to the mass ratio of 6;
the preparation method of the modified slow-setting and slow-release component comprises the following steps: uniformly mixing glycerol and sodium pyrophosphate according to a mass ratio of 1; the mass ratio of the sodium silicate to the retarding component is 1.
Control group 1:
the mixing proportion of different components is the same as that in example 1, except that 4 parts of the slow-release plastic stabilizer for wet-mixed mortar is obtained by directly and uniformly mixing glycerol and sodium pyrophosphate according to the mass ratio of 1;
the water retention component is obtained by uniformly mixing hydroxyethyl cellulose ether and polyacrylamide according to a mass ratio of 8. Control group 2:
the specific components and the doping proportion are the same as those in example 1, and the difference is that when the modified slow-setting retarding and slow-releasing component is prepared, the modulus of the selected sodium silicate is 1.5, and other conditions are unchanged.
Control group 3:
the specific components and the blending ratio were the same as in example 1, except that the heating temperature was 400 ℃ when the modified slow-setting retarding and slow-releasing component was prepared.
Control group 4:
the specific components and the blending ratio were the same as in example 1 except that the heating temperature was 200 ℃ when the modified set-retarding slow-release component was prepared.
The obtained plastic stabilizer is detected according to the related regulation of JC/T2590-2021 & lt & gt Wet-mixed mortar plastic stabilizer, the mass ratio of cement to sand of the mortar is detected to be 1; the water consumption is controlled to be (85 +/-5) mm of mortar consistency, and the specific preparation method is carried out according to the relevant regulation of JC/T2590-2021 'wet-mixed mortar plasticizer stabilizer'.
The plasticizer stabilizer obtained above was tested according to the regulation of JC/T2590-2021 "Wet-mixed mortar plasticizer stabilizer", and the results are shown in the following table:
table 1 results of data tested in each of examples and comparative examples
As can be seen from Table 1, the plasticity-stabilizing agent prepared by the invention meets the relevant requirements of the standard, the corresponding index is far higher than the standard requirement, the water retention rate is greatly improved, the plasticity-maintaining time of the wet-mixed mortar is effectively adjusted by adding different mixing amounts in example 1, and particularly, when the mixing amount in example 1 is 1.5%, the plasticity-maintaining time can reach 76h, the workability of the slurry is kept well in the plasticity-maintaining time, the construction is facilitated, the 14d tensile bonding strength ratio is greatly increased, the 28d compressive strength loss is low, and the relevant requirements of JC/T2590-2021 are also met. As can be seen from the comparison group 1, after the non-modified retarding component is mixed and used, the plastic retention time of the wet-mixed mortar is only 10 hours, which is far lower than 48 hours after modification, and the strength is not obviously different from that after modification. This indicates that the compression strength is not lost although the plastic retention time is greatly prolonged after modification. As can be seen from the comparison group 2 and the comparison group 3, the plastic retention time cannot be prolonged to a great extent even when the preparation temperature condition of the modified delayed-coagulation slow-release component is changed.
Claims (7)
1. The slow-release plastic stabilizer for the wet-mixed mortar is characterized by being prepared by uniformly mixing the following components in parts by weight:
the preparation method of the modified slow-setting and slow-release component comprises the following steps: firstly, uniformly mixing glycerol and sodium pyrophosphate to form a retarding component, and adding the retarding component into a sodium silicate solution with a modulus of not less than 2.0 to obtain a mixed solution; then heating to 100-300 ℃, and pouring the mixed solution into liquid nitrogen for quenching; and finally, air-drying and molding the cooled particles for 5-15 min under the wind-heat condition of 300-1000 ℃, and quickly carrying out air-cooling and molding to obtain the sodium silicate hollow microsphere particles, namely the modified slow-setting and slow-release component.
2. The slow-release plastic stabilizer for wet-mixed mortar according to claim 1, wherein the preparation of the modified slow-release retarding component comprises the following components in a mass ratio of 1.
3. The slow-release plastic stabilizer for wet-mixed mortar according to claim 1, wherein the mass ratio of sodium silicate to the retarding component in the preparation of the modified retarding slow-release component is 1-5.
4. The wet-mixed sand of claim 1The slow-release plastic stabilizer for the pulp is characterized in that the specific surface area of the modified slow-release component is 300-600 kg/m 3 。
5. The slow-release plastic stabilizer for the wet-mixed mortar of claim 1, wherein the water-retention component is prepared by uniformly mixing hydroxyethyl cellulose ether and polyacrylamide according to a mass ratio of 8-4.
6. The slow-release plastic stabilizer for wet-mixed mortar according to claim 1, wherein the foam stabilizer is triethanolamine or calcium stearate.
7. The slow-release plastic stabilizer for wet-mixed mortar according to claim 1, wherein the air-entraining component is triterpenoid saponin.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211152890.9A CN115490454A (en) | 2022-09-21 | 2022-09-21 | Slow-release plastic stabilizing agent for wet-mixed mortar |
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| CN202211152890.9A CN115490454A (en) | 2022-09-21 | 2022-09-21 | Slow-release plastic stabilizing agent for wet-mixed mortar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115872665A (en) * | 2022-12-27 | 2023-03-31 | 沈阳泰丰特种混凝土有限公司 | Additive for prolonging concrete plastic-retaining time and concrete preparation method |
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| CN104556811A (en) * | 2014-12-30 | 2015-04-29 | 浙江建科新材料开发有限公司 | Wet-mixed mortar modifier |
| US20150152011A1 (en) * | 2013-11-29 | 2015-06-04 | Nano And Advanced Materials Institute Limited | Hydrophobic low shrinkage lightweight cementitious matrix |
| CN109942225A (en) * | 2019-03-01 | 2019-06-28 | 蒋留平 | A kind of preparation method of heat resist modification type retarder |
| CN111517688A (en) * | 2020-04-21 | 2020-08-11 | 杭州砺品科技有限公司 | Concrete retarder and preparation method thereof |
| CN111646725A (en) * | 2020-05-15 | 2020-09-11 | 湖南武源建材有限责任公司 | Wet-mixed mortar plasticity stabilizer and preparation method thereof |
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2022
- 2022-09-21 CN CN202211152890.9A patent/CN115490454A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150152011A1 (en) * | 2013-11-29 | 2015-06-04 | Nano And Advanced Materials Institute Limited | Hydrophobic low shrinkage lightweight cementitious matrix |
| CN104556811A (en) * | 2014-12-30 | 2015-04-29 | 浙江建科新材料开发有限公司 | Wet-mixed mortar modifier |
| CN109942225A (en) * | 2019-03-01 | 2019-06-28 | 蒋留平 | A kind of preparation method of heat resist modification type retarder |
| CN111517688A (en) * | 2020-04-21 | 2020-08-11 | 杭州砺品科技有限公司 | Concrete retarder and preparation method thereof |
| CN111646725A (en) * | 2020-05-15 | 2020-09-11 | 湖南武源建材有限责任公司 | Wet-mixed mortar plasticity stabilizer and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115872665A (en) * | 2022-12-27 | 2023-03-31 | 沈阳泰丰特种混凝土有限公司 | Additive for prolonging concrete plastic-retaining time and concrete preparation method |
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