CN110510912B - Wet-mixed mortar additive and preparation method thereof - Google Patents
Wet-mixed mortar additive and preparation method thereof Download PDFInfo
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- CN110510912B CN110510912B CN201910938211.2A CN201910938211A CN110510912B CN 110510912 B CN110510912 B CN 110510912B CN 201910938211 A CN201910938211 A CN 201910938211A CN 110510912 B CN110510912 B CN 110510912B
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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
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Abstract
The invention discloses a wet-mixed mortar additive, which comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 30-50 parts of mother liquor, 50-70 parts of water and 0.1-0.2 part of water-retaining agent, wherein the mother liquor comprises the following components in parts by weight: 42-54 parts of bottom water, 6-10 parts of a water reducing agent monomer, 24-30 parts of sodium gluconate, 2.4-3.6 parts of sodium dodecyl sulfate, 0.08-0.12 part of vitamin C, 0.4-0.6 part of ammonium persulfate, 4-6 parts of acrylic acid, 1.5-2.5 parts of hydrogen peroxide and 5.5-8.5 parts of water; the component B comprises 62-82 parts of liquid sodium gluconate, 4-8 parts of powder sodium gluconate, 4-8 parts of white sugar and 10-22 parts of water. The additive disclosed by the invention is simple to prepare and convenient to use, can stabilize the quality of wet-mixed mortar when being added into the wet-mixed mortar, has good workability and sag resistance, has good frost resistance and permeability resistance effects, improves the durability and compressive strength of the mortar, reduces the mortar waste, saves energy and reduces emission. The invention also provides a preparation method of the additive.
Description
Technical Field
The invention belongs to the technical field of mortar additives, and particularly relates to a wet-mixed mortar additive and a preparation method thereof.
Background
At present, under the requirements and guidance of national relevant industrial policies, particularly environmental protection and energy policy, large, medium and small cities all over the country start to forbid field mortar stirring and vigorously popularize premixed mortar, and the premixed mortar has two forms of dry-mixed mortar and wet-mixed mortar. The dry-mixed mortar is a dry-mixed building material formed by combining solid materials such as a cementing material, a mineral admixture, a fine aggregate, an admixture and the like and pre-mixed by a dry-mixing process according to a certain proportion. The wet-mixed mortar is prepared by reasonably preparing various raw materials (including water), carrying out industrial production, and conveying the raw materials to a construction site by a transportation tool (usually a closed tank car) to ensure the proportion and the performance. Therefore, national policies also range from "mainly dry-mix" to "dry-wet-mix", and wet-mix mortar is a critical opportunity for the development of ready-mix mortar as an important member of the group.
The mortar additive is mainly used for masonry and plastering mortar. After the mortar additive is added, the approach time of the mortar can be arranged according to the operation habit and the working time of workers, the mortar does not need to be coagulated in a short time, and the waste problem of the residual mortar does not need to be considered. The wet-mixed mortar is transported from a production point to a field for use, and has higher requirements on the working performance, namely the mortar needs to have good enough workability and normal construction and operation before initial setting after being mixed with water, and the hardened mortar needs to meet the requirements of an engineering structure on mechanical performance, durability and the like. Therefore, in engineering, the additive with the performances of water retention, retardation and the like is generally adopted to ensure the good water retention and workability of the wet-mixed mortar.
In the prior art, a wet-mixed mortar additive generally consists of a material A and a material B, wherein the material A contains a water retention component and a retarding component, if the operation time of the wet-mixed mortar needs to be adjusted, the addition amount of each substance in the material A needs to be changed inevitably, so that the addition amount of the water retention component is changed accordingly, the water retention property and the density of the wet-mixed mortar are influenced, if the problem needs to be solved, the material A with different proportions needs to be prepared according to different operation times, and the production and the use are inconvenient. The existing Chinese patent with the patent number of CN106746891B provides a wet-mixed mortar additive, wherein a component A is used as a water retention component, a component B is used as a retarding component, wet-mixed mortar meeting different operation times can be obtained by only adjusting the mixing amount of the component B, and the wet-mixed mortar additive has the characteristic of higher gel temperature by adopting methyl hydroxyethyl cellulose with specific viscosity as a water retention agent, has good water retention property, but cannot well control the opening time of the wet-mixed mortar, has smaller opening time range and cannot be dried immediately. In addition, when the existing wet-mixed mortar additive is added, the water retention performance of the wet-mixed mortar additive is obviously reduced and the storage stability is poor when the temperature of sand, cement, water and the like is high in summer; the performance of the wet-mixed mortar additive is different in the processes of transportation, storage and construction, and the effects of different wet-mixed mortar additives on frost resistance, impermeability, durability and the like of the mortar are different.
In order to solve the problems and overcome the problems in the prior art, the invention provides the wet-mixed mortar additive which is simple to prepare and convenient to use, can stabilize the quality of wet-mixed mortar, has good workability and sag resistance, has good frost resistance and permeability resistance effects, improves the durability and compressive strength of the mortar, reduces mortar waste, saves energy and reduces emission.
Disclosure of Invention
The wet-mixed mortar additive provided by the invention solves the problems of inconvenient production and use, poor water retention performance and poor storage stability effect at higher temperature in summer and the like in the prior art, and can stabilize the quality of wet-mixed mortar, so that the wet-mixed mortar has better frost resistance, impermeability and other properties.
In order to solve the technical problems, the invention provides a wet-mixed mortar additive which comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 30-50 parts of mother liquor, 50-70 parts of water and 0.1-0.2 part of water-retaining agent, wherein the mother liquor comprises the following components in parts by weight: 42-54 parts of bottom water, 6-10 parts of a water reducing agent monomer, 24-30 parts of sodium gluconate, 2.4-3.6 parts of sodium dodecyl sulfate, 0.08-0.12 part of vitamin C, 0.4-0.6 part of ammonium persulfate, 4-6 parts of acrylic acid, 1.5-2.5 parts of hydrogen peroxide and 5.5-8.5 parts of water; the component B comprises 62-82 parts of liquid sodium gluconate, 4-8 parts of powder sodium gluconate, 4-8 parts of white sugar and 10-22 parts of water.
Furthermore, the water reducing agent monomer is methyl allyl polyoxyethylene ether.
Further, the water retaining agent is hydroxypropyl methyl cellulose.
The invention also provides a preparation method of the wet-mixed mortar additive, and the preparation method of the component A comprises the following steps:
(1) weighing the raw materials according to the weight ratio;
(2) firstly, heating bottom water to 30 ℃ under stirring, then adding a water reducing agent monomer, continuously adding sodium gluconate and 0.4-0.6 part of sodium dodecyl sulfate, and uniformly stirring;
(3) preparing a material a, a material b and a material c:
a, material a: dissolving vitamin C in 1.5-2.5 parts of water to obtain a material a;
b, material preparation: diluting ammonium persulfate and acrylic acid with 4-6 parts of water to obtain a material b;
c, material preparation: and weighing 1.5-2.5 parts of hydrogen peroxide for later use.
(4) Heating the mixed solution prepared in the step (2) to 55 ℃, adding the prepared material c, then heating to 60 ℃, adding the material a, and adding the material b after the addition is finished;
(5) controlling the reaction temperature of the mixed solution prepared in the step (4) below 70 ℃, and preserving the heat for 3 hours at the temperature;
(6) cooling the mixed solution prepared in the step (5) to 30 ℃, then adding 2-3 parts of sodium dodecyl sulfate, and uniformly stirring to obtain mother liquor;
(7) adding 30-50 parts of mother liquor into 50-70 parts of water, then adding 0.1-0.2 part of hydroxypropyl methyl cellulose, and uniformly stirring to obtain a component A;
the preparation method of the component B comprises the following steps: adding water into a stirring tank, sequentially adding liquid sodium gluconate, powder sodium gluconate and white sugar, and stirring to dissolve completely to obtain component B.
Furthermore, the cooling manner in the step (6) may be natural cooling or circulation cooling.
The application method of the wet-mixed mortar additive comprises the following steps: the mixing amount of the component A is 4Kg/m3-8Kg/m3The mixing amount of the component B is 4Kg/m3-10Kg/m3。
Compared with the prior art, the invention has the beneficial effects that: according to the wet-mixed mortar additive provided by the invention, the component A is mainly a water retention component, the component B is a retardation component, wet-mixed mortar meeting different operation time can be obtained only by simply adjusting the addition amount of the component B, the use is convenient, and the production operation is simple; the component A is mainly used for adjusting the volume weight of the mortar, so that the wet-mixed mortar has good workability, sag resistance, durability, frost resistance and impermeability, keeps the plasticity of the mortar, and is easier to put on walls and trowel; the component B can well control the hydration time of the wet-mixed mortar, namely, water retention and time delay, in the newly-mixed wet-mixed mortar, the component B can be adsorbed on the surface of silicate particles to inhibit the digestion reaction of cement, when the slurry is gradually dried, the concentration of OH ions in the slurry is increased, the component B is decomposed, the silicate cement recovers the normal hydration reaction, the hydration time of the component B can be stably controlled within 6-72h, the quality of the mortar is stabilized, the performance of the mortar is consistent in the processes of transportation, storage and construction, the good service performance is still maintained within 12-24h, and the mortar is normally solidified and hardened after being constructed on a wall, so that the mortar can be cured without drying; the preparation method is simple, convenient to use, capable of realizing specialized, mechanical and large-scale production, capable of reducing mortar waste, energy-saving and emission-reducing, and green and environment-friendly.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.
The wet-mixed mortar additive and the preparation method thereof according to the present invention will be described with reference to the following specific examples.
Example 1:
1. formulation (in weight ratio)
Mother liquor:
48 parts of bottom water;
8 parts of methyl allyl polyoxyethylene ether;
27 parts of sodium gluconate;
3 parts of sodium dodecyl sulfate;
a, material a: 0.1 part of vitamin C and 2 parts of water;
b, material preparation: 0.5 part of ammonium persulfate, 5 parts of acrylic acid and 5 parts of water;
c, material preparation: 2 parts of hydrogen peroxide.
The component A comprises:
40 parts of mother liquor, 60 parts of water and 0.15 part of hydroxypropyl methyl cellulose.
And B component:
70 parts of liquid sodium gluconate; 6 parts of powder sodium gluconate; 6 parts of white sugar; and 18 parts of water.
2. Preparation method
The preparation method of the component A comprises the following steps:
(1) firstly, heating bottom water to 30 ℃ under stirring, then adding a water reducing agent monomer, continuously adding sodium gluconate and 0.4-0.6 part of sodium dodecyl sulfate, and uniformly stirring;
(2) preparing a material a, a material b and a material c:
a, material a: dissolving vitamin C in water to obtain a material a;
b, material preparation: diluting ammonium persulfate and acrylic acid with water to obtain a material b;
c, material preparation: and weighing the hydrogen peroxide for later use.
(3) Heating the mixed solution prepared in the step (1) to 55 ℃, adding the prepared material c, then heating to 60 ℃, adding the material a, and adding the material b after the addition is finished;
(4) controlling the reaction temperature of the mixed solution prepared in the step (3) below 70 ℃, preserving the heat for 3 hours at the temperature, and performing circulating cooling or natural cooling after heat preservation, wherein the heat preservation process is ensured to be not less than 3 hours;
(5) circularly cooling or naturally cooling the mixed solution prepared in the step (4) to 30 ℃, then adding 2-3 parts of sodium dodecyl sulfate, and uniformly stirring to obtain mother liquor;
(6) adding the mother solution into water, then adding hydroxypropyl methyl cellulose, and uniformly stirring to obtain a component A;
it is worth noting that: in the heat preservation process, the reaction kettle cannot be circularly cooled in the stirring process. If water needs to be supplemented after heat preservation, the water supplementing temperature needs to be controlled below 30 ℃, otherwise, gel is generated, the whole product is scrapped and cannot be taken out of the reaction kettle, and serious quality accidents are caused.
It is also noteworthy that: after the mother liquor is finished, water is not added as much as possible, and the mother liquor is preferably used directly.
The preparation method of the component B comprises the following steps: adding water into a stirring tank, sequentially adding liquid sodium gluconate, powder sodium gluconate and white sugar, and stirring to dissolve completely to obtain component B.
Example 2:
1. formulation (in weight ratio)
Mother liquor:
42 parts of bottom water;
6 parts of methyl allyl polyoxyethylene ether;
24 parts of sodium gluconate;
2.4 parts of sodium dodecyl sulfate;
a, material a: 0.08 part of vitamin C and 1.5 parts of water;
b, material preparation: 0.4 part of ammonium persulfate, 4 parts of acrylic acid and 4 parts of water;
c, material preparation: 1.5 parts of hydrogen peroxide.
The component A comprises:
30 parts of mother liquor, 50 parts of water and 0.1 part of hydroxypropyl methyl cellulose.
And B component:
62 parts of liquid sodium gluconate; 8 parts of powder sodium gluconate; 8 parts of white sugar; and 22 parts of water.
2. Preparation method
A. The preparation of component B was the same as in example 1.
Example 3:
1. formulation (in weight ratio)
Mother liquor:
54 parts of bottom water;
10 parts of methyl allyl polyoxyethylene ether;
30 parts of sodium gluconate;
3.6 parts of sodium dodecyl sulfate;
a, material a: 0.12 part of vitamin C and 2.5 parts of water;
b, material preparation: 0.6 part of ammonium persulfate, 6 parts of acrylic acid and 6 parts of water;
c, material preparation: 2.5 parts of hydrogen peroxide.
The component A comprises:
50 parts of mother liquor, 70 parts of water and 0.2 part of hydroxypropyl methyl cellulose.
And B component:
82 parts of liquid sodium gluconate; 4 parts of powder sodium gluconate; 4 parts of white sugar; and 10 parts of water.
2. Preparation method
A. The preparation of component B was the same as in example 1.
Example 4: application of wet-mixed mortar additive
The component A is mainly used for adjusting the volume weight of the mortar, the component A in the examples 1 to 3 is added into the production process of the wet-mixed mortar for improving the workability, water retention property, caking property, cracking resistance and the like of the wet-mixed mortar, and the component B is used as a wet-mixed mortar adjusting agent and is added into the production process of the wet-mixed mortar for adjusting the open time (initial setting time of the wet-mixed mortar) of the wet-mixed mortar. A. The component B is prepared into the following wet-mixed mortar respectively, and the performances of the wet-mixed mortar are tested at the same time, and the formula and the performance test results of the wet-mixed mortar are shown in Table 1.
TABLE 1 comparison of the Properties of different A, B Components added to Wet-mix mortars
The test results in table 1 show that compared with the blank test and other company additives (i.e. comparative test), the addition of the A, B component of the present invention can significantly improve the operation time of the wet-mixed mortar, the operation time can be stably controlled within the range of 6-72 hours, and the hardening of the mortar can be ensured within 3-5 hours after the upper wall of the mortar loses water;
the A, B component can obviously improve the water retention rate of the wet-mixed mortar, and the water retention rate at normal temperature and 45 ℃ can reach more than 90%;
the addition of the A, B component can adjust the volume weight of the wet-mixed mortar, and the volume weight is relatively low, and the volume weight change trend of the wet-mixed mortar is not greater than that of a comparative test along with the increase of time;
the A, B component is added, so that the wet-mixed mortar has good viscosity and good sag resistance, and compared with a comparative test, the wet-mixed mortar has obviously higher consistencies in 2h, 18h, 24h and 48h and smaller consistency loss rate in 2 h;
the A, B component can obviously improve the compressive strength of the wet-mixed mortar, and compared with a comparative test, the compressive strength of 7d and 28d is obviously improved;
the A, B component can improve the frost resistance of the wet-mixed mortar, and compared with a comparative test, the strength loss rate and the quality loss rate of the wet-mixed mortar have small changes; the invention can also obviously improve the impermeability of the wet-mixed mortar and improve the durability of the mortar.
From the above test results, it can be seen that the A, B component in example 1 has the optimum composition ratio, and the properties obtained by adding it to the wet-mixed mortar are the best. The addition amount of the component A added into the wet-mixed mortar can be 4Kg/m by adjusting according to the gradation condition of the sand3-8Kg/m3(ii) a The mixing amount of the component B added into the wet-mixed mortar can be 4Kg/m by adjusting the components according to the climate and temperature of the wet-mixed mortar site, the comprehensive working performance required by the construction site and other factors3-10Kg/m3。
Through the above specific examples and test data, the wet-mixed mortar additive of the invention has the following technical advantages:
(1) and controlling the hydration time, namely the water retention time and the delay time, of the wet-mixed mortar.
(2) The workability and the viscosity of the wet-mixed mortar are improved, and the later strength of the wet-mixed mortar is improved.
(3) The plasticity of the wet-mixed mortar is kept, and the wet-mixed mortar is easier to be applied to walls and leveled.
(4) The quality of the wet-mixed mortar is stabilized, the wet-mixed mortar has consistent performance in the processes of transportation, storage and construction, and good service performance can be maintained within 12-24 h.
(5) The workability is good, the sagging resistance is good, and the mortar is normally solidified and hardened after being constructed on a wall, does not need to be dried, and is hard after use.
(6) Can improve the frost resistance and the impermeability of the wet-mixed mortar and improve the durability of the mortar.
(7) The mortar can be produced in a specialized, mechanical and large-scale manner, is sealed, dustless, loaded, unloaded, stored and applied, greatly reduces mortar waste, saves energy, reduces emission, is green and environment-friendly, and improves the economic benefit of enterprises.
The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
Claims (7)
1. The wet-mixed mortar additive is composed of a component A and a component B, and is characterized in that the component A comprises the following components in parts by weight: 30-50 parts of mother liquor, 50-70 parts of water and 0.1-0.15 part of water-retaining agent, wherein the mother liquor comprises the following components in parts by weight: 42-54 parts of bottom water, 6-10 parts of a water reducing agent monomer, 24-30 parts of sodium gluconate, 2.4-3.6 parts of sodium dodecyl sulfate, 0.08-0.12 part of vitamin C, 0.4-0.6 part of ammonium persulfate, 4-6 parts of acrylic acid, 1.5-2.5 parts of hydrogen peroxide and 5.5-8.5 parts of water; the component B is as follows: 62-82 parts of liquid sodium gluconate, 4-8 parts of powder sodium gluconate, 4-8 parts of white sugar and 10-22 parts of water;
the water reducing agent monomer is methyl allyl polyoxyethylene ether; the water-retaining agent is hydroxypropyl methyl cellulose.
2. The preparation method of the wet-mixed mortar additive as claimed in claim 1, wherein the preparation method of the component A comprises the following steps: (1) weighing the raw materials according to the weight ratio; (2) firstly, heating bottom water to 30 ℃ under stirring, then adding a water reducing agent monomer, continuously adding sodium gluconate and 0.4-0.6 part of sodium dodecyl sulfate, and uniformly stirring; (3) preparing a material a, a material b and a material c; (4) heating the mixed solution prepared in the step (2) to 55 ℃, adding the prepared material c, then heating to 60 ℃, adding the material a, and adding the material b after the addition is finished; (5) controlling the reaction temperature of the mixed solution prepared in the step (4) below 70 ℃, and preserving the heat for 3 hours at the temperature; (6) cooling the mixed solution prepared in the step (5) to 30 ℃, then adding 2-3 parts of sodium dodecyl sulfate, and uniformly stirring to obtain mother liquor; (7) adding 30-50 parts of mother liquor into 50-70 parts of water, then adding 0.1-0.15 part of hydroxypropyl methyl cellulose, and uniformly stirring to obtain a component A; the preparation method of the component B comprises the following steps: adding water into a stirring tank, sequentially adding liquid sodium gluconate, powder sodium gluconate and white sugar, and stirring to dissolve completely to obtain component B.
3. The preparation method of the wet-mixed mortar additive according to claim 2, wherein the preparation method of the material a in the step (3) comprises the following steps: dissolving vitamin C in 1.5-2.5 parts of water to obtain material a.
4. The preparation method of the wet-mixed mortar additive according to claim 2, wherein the preparation method of the material b in the step (3) is as follows: diluting ammonium persulfate and acrylic acid with 4-6 parts of water to obtain a material b.
5. The preparation method of the wet-mixed mortar additive according to claim 2, wherein the preparation method of the material c in the step (3) is as follows: and weighing 1.5-2.5 parts of hydrogen peroxide for later use.
6. The method for preparing wet-mixed mortar additive according to claim 2, wherein the cooling in the step (6) is natural cooling or circulating cooling.
7. The use method of the wet-mixed mortar additive of claim 1 or the wet-mixed mortar additive prepared by the method of any one of claims 2 to 6, wherein the content of the component A of the wet-mixed mortar additive is 4Kg/m3-8Kg/m3The mixing amount of the component B is 4Kg/m3-10Kg/m3。
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| CN105601158A (en) * | 2015-12-24 | 2016-05-25 | 湖南中岩建材科技有限公司 | Mortar additive |
| CN106348638A (en) * | 2016-08-23 | 2017-01-25 | 中建西部建设西南有限公司 | Additive for maintaining construction performance of wet mixing mortar and preparation method thereof |
| CN108328959A (en) * | 2018-02-11 | 2018-07-27 | 张玉广 | A kind of three high mother liquor of polycarboxylic acids and its manufacturing method |
| CN109293274A (en) * | 2018-09-29 | 2019-02-01 | 莱芜市易和环保科技有限公司 | A kind of wet mixing mortar special additive and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105601158A (en) * | 2015-12-24 | 2016-05-25 | 湖南中岩建材科技有限公司 | Mortar additive |
| CN106348638A (en) * | 2016-08-23 | 2017-01-25 | 中建西部建设西南有限公司 | Additive for maintaining construction performance of wet mixing mortar and preparation method thereof |
| CN108328959A (en) * | 2018-02-11 | 2018-07-27 | 张玉广 | A kind of three high mother liquor of polycarboxylic acids and its manufacturing method |
| CN109293274A (en) * | 2018-09-29 | 2019-02-01 | 莱芜市易和环保科技有限公司 | A kind of wet mixing mortar special additive and preparation method thereof |
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