阅读说明：本技术 一种加快混凝土制品静停养护的方法 (Method for accelerating static maintenance of concrete product ) 是由 张国华 王昆芳 刘宜 唐国军 王志磊 于 2018-08-21 设计创作，主要内容包括：本发明公开了一种加快混凝土制品静停养护的方法,属于建筑工程技术领域,包括复合外加剂和混凝土原材料,复合外加剂由35-45份减水型促凝剂、1-2份木糖醇、5-10份调节剂与余量的水充分混合而成,使用时,先将混凝土原材料按配合比称量,在按胶凝材料质量的1％-1.5％掺用复合外加剂,按工艺要求进行混凝土搅拌、成型,按常规同条件静停养护时间的30％-40％对混凝土制品进行静停养护。本发明大幅度缩短了混凝土制品的静停养护时间,缩短施工时间,提高工程效率,在建筑工程领域应用广泛。(The invention discloses a method for accelerating the static curing of concrete products, which belongs to the technical field of building engineering and comprises a composite additive and a concrete raw material, wherein the composite additive is prepared by fully mixing 35-45 parts of a water-reducing type coagulant, 1-2 parts of xylitol, 5-10 parts of a regulator and the balance of water, when in use, the concrete raw material is weighed according to the mixing ratio, the composite additive is mixed according to 1-1.5% of the mass of a cementing material, the concrete is stirred and formed according to the process requirement, and the static curing of the concrete products is carried out according to 30-40% of the static curing time under the same conventional condition. The invention greatly shortens the static maintenance time of the concrete product, shortens the construction time, improves the engineering efficiency and has wide application in the field of building engineering.)

1. A method for accelerating the static maintenance of concrete products is characterized by comprising the following steps:

step 1: fully mixing 35-45 parts of water-reducing type coagulant, 1-2 parts of xylitol, 5-10 parts of regulator and the balance of water to prepare a composite additive;

step 2: weighing concrete raw materials according to the mixing proportion, and mixing the composite admixture according to 1-1.5% of the mass of the cementing material;

and step 3: stirring and forming the concrete according to the process requirements;

and 4, step 4: and (3) performing static curing on the concrete product according to 30-40% of the static curing time under the same conventional condition.

2. The method of accelerating the static maintenance of concrete articles of claim 1, wherein the water-reducing accelerator is comprised of: 3-4 parts of acrylic acid, 25-40 parts of composite polyether monomer, 0.3-1 part of hydroxyethyl acrylate, 0.1-0.15 part of mercaptopropionic acid, 0.03-0.04 part of vitamin C, 0.25-0.35 part of 30% aqueous hydrogen peroxide solution, 1-1.5 parts of sodium hydroxide and the balance of water.

3. The method for accelerating the static curing of concrete products as claimed in claim 2, wherein the composite polyether monomer comprises the cyclic nitrogen ethane-HPEG with the relative molecular weight of 2400-.

4. The method for accelerating the static curing of concrete products according to claim 2, wherein the mass concentration of the acrylic acid aqueous solution is 60% and the mass concentration of the mercaptopropionic acid is 8%.

5. The method of claim 1, wherein the modifier is one of sodium metabisulfite and sodium bisulfite.

6. The method for accelerating the standing curing of concrete products as claimed in claim 2, wherein the weighed aqueous hydrogen peroxide solution is added into the reaction kettle, the temperature of the materials in the kettle is controlled to be not lower than 40 ℃, and 5 minutes later, the acrylic acid aqueous solution with the mass concentration of 60% and the mixed aqueous solution of the mercaptopropionic acid and the vitamin C with the mass concentration of 8% are started to be dripped, wherein the dripping time of the acrylic acid solution is 1 to 3 hours, and the dripping time of the mixed aqueous solution of the mercaptopropionic acid and the vitamin C is 1.5 to 3.5 hours.

7. The method for accelerating the standing curing of the concrete product as claimed in claim 2, wherein after the dropwise addition is completed, the reaction is carried out for 1 hour under the condition of heat preservation, sodium hydroxide and water are added, and the pH value is adjusted to be 4-6, and the solid content is adjusted to be 40% ± 1%.

Technical Field

The invention relates to a method for curing a concrete product, in particular to a method for accelerating the static curing of the concrete product, belonging to the technical field of constructional engineering.

Background

In recent years, the building industry is rapidly developed, after concrete is poured, if the concrete is maintained in hot weather and air drying in time, moisture in the concrete can be evaporated too fast, a dehydration phenomenon is formed, cement particles which form gel cannot be fully hydrated, cannot be converted into stable crystals, and lack of sufficient cohesive force, so that flaky or powdery falling can occur on the surface of the concrete. Further, when the concrete does not have sufficient strength, premature evaporation of water causes large shrinkage deformation and cracks due to drying shrinkage. The existing curing method is long in time consumption and difficult to process, and the trend of shortening the curing time of concrete products is building engineering.

Disclosure of Invention

The invention mainly aims to provide a method for accelerating the static curing of a concrete product, which shortens the curing time of the concrete product, reduces the time of construction engineering and improves the construction efficiency.

The purpose of the invention can be achieved by adopting the following technical scheme:

a method for accelerating the static curing of concrete products comprises the following steps:

step 1: fully mixing 35-45 parts of water-reducing type coagulant, 1-2 parts of xylitol, 5-10 parts of regulator and the balance of water to prepare a composite additive;

step 2: weighing concrete raw materials according to the mixing proportion, and mixing the composite admixture according to 1-1.5% of the mass of the cementing material;

and step 3: stirring and forming the concrete according to the process requirements;

and 4, step 4: performing static curing on the concrete product according to 30-40% of the static curing time under the same conventional conditions;

further, the water-reducing type accelerator consists of: 3-4 parts of acrylic acid, 25-40 parts of composite polyether monomer, 0.3-1 part of hydroxyethyl acrylate, 0.1-0.15 part of mercaptopropionic acid, 0.03-0.04 part of vitamin C, 0.25-0.35 part of 30% aqueous hydrogen peroxide solution, 1-1.5 parts of sodium hydroxide and the balance of water.

Further, the composite polyether monomer consists of cyclic nitrogen ethane-HPEG with the relative molecular weight of 2400-5000 and TPEG with the relative molecular weight of 2400-5000 according to the mass ratio of 1: 6-12.

Further, the mass concentration of the acrylic acid aqueous solution is 60%, and the mass concentration of the mercaptopropionic acid is 8%.

Further, the regulator is one of sodium metabisulfite and sodium bisulfite.

Further, adding the weighed aqueous hydrogen peroxide solution into a reaction kettle, controlling the temperature of materials in the kettle to be not lower than 40 ℃, and after 5 minutes, beginning to dropwise add an acrylic acid aqueous solution with the mass concentration of 60% and a mixed aqueous solution of mercaptopropionic acid with the mass concentration of 8% and vitamin C, wherein the dropwise adding time of the acrylic acid solution is 1-3 hours, and the dropwise adding time of the mixed aqueous solution of the mercaptopropionic acid and the vitamin C is 1.5-3.5 hours.

Further, after the dropwise addition is finished, the reaction is carried out for 1 hour under the condition of heat preservation, sodium hydroxide and water are added, the pH value is adjusted to be 4-6, and the solid content is adjusted to be 40% +/-1%

The invention has the beneficial technical effects that: according to the method for accelerating the static curing of the concrete product, the curing time of the concrete product can be obviously shortened, the construction time is shortened, and the engineering efficiency is improved.

Detailed Description

In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail with reference to the following examples, but the embodiments of the present invention are not limited thereto.

In this embodiment, the method for accelerating the static curing of the concrete product includes the following steps:

step 1: fully mixing 35-45 parts of water-reducing type coagulant, 1-2 parts of xylitol, 5-10 parts of regulator and the balance of water to prepare a composite additive;

step 2: weighing concrete raw materials according to the mixing proportion, and mixing the composite admixture according to 1-1.5% of the mass of the cementing material;

and step 3: stirring and forming the concrete according to the process requirements;

and 4, step 4: performing static curing on the concrete product according to 30-40% of the static curing time under the same conventional conditions;

in this embodiment, the water-reducing setting accelerator consists of: 3-4 parts of acrylic acid, 25-40 parts of composite polyether monomer, 0.3-1 part of hydroxyethyl acrylate, 0.1-0.15 part of mercaptopropionic acid, 0.03-0.04 part of vitamin C, 0.25-0.35 part of 30% aqueous hydrogen peroxide solution, 1-1.5 parts of sodium hydroxide and the balance of water.

In the embodiment, the composite polyether monomer consists of the cyclic nitrogen ethane-HPEG with the relative molecular weight of 2400-5000-adulterated materials and the TPEG with the relative molecular weight of 2400-5000-adulterated materials in a mass ratio of 1: 6-12.

In this example, the mass concentration of the acrylic acid aqueous solution was 60% and the mass concentration of mercaptopropionic acid was 8%.

In this embodiment, the modifier is one of sodium metabisulfite and sodium bisulfite.

In this example, weighed aqueous hydrogen peroxide solution was added to a reaction kettle, the temperature of the materials in the kettle was controlled to be not lower than 40 ℃, and 5 minutes later, an aqueous acrylic acid solution with a mass concentration of 60% and a mixed aqueous solution of mercaptopropionic acid with a mass concentration of 8% and vitamin C were added dropwise, wherein the time for adding the acrylic acid solution was 1 to 3 hours, and the time for adding the mixed aqueous solution of mercaptopropionic acid and vitamin C was 1.5 to 3.5 hours.

In this example, after the completion of the dropwise addition, the reaction was carried out for 1 hour under heat preservation, sodium hydroxide and water were added, the pH was adjusted to 4-6, and the solid content was adjusted to 40% +/-1%

In this example, the synthesis procedure of the water-reducing setting accelerator is as follows:

step 1: preparing an acrylic acid aqueous solution with the mass concentration of 60% and a mixed aqueous solution of mercaptopropionic acid with the mass concentration of 8% and vitamin C according to a formula;

step 2: adding bottom water with specified mass into the reaction kettle, starting a stirrer, adding the composite polyether monomer, and stirring until the polyether is completely dissolved;

and 3, adding the weighed aqueous hydrogen peroxide solution into a reaction kettle, controlling the temperature of materials in the kettle to be not lower than 40 ℃, and dropwise adding the aqueous solution prepared in the step (1) after 5 minutes, wherein: the dripping time of the acrylic acid solution is 1 to 3 hours, and the dripping time of the mixed aqueous solution of the mercaptopropionic acid and the vitamin C is 1.5 to 3.5 hours;

step 4, after the dropwise addition is finished, carrying out heat preservation reaction for 1 hour, adding sodium hydroxide and water, and adjusting the pH value to 4-6 and the solid content to 40% +/-1%;

and 5: the synthesis product is pumped to a storage tank for use.

In summary, the method for accelerating the static curing of the concrete product provided by the embodiment can obviously shorten the curing time of the concrete product, and simultaneously prevent the dehydration phenomenon caused by too fast evaporation of water in the concrete, so that the sheet or powder on the surface of the concrete is separated, and the method is simple to operate and wide in application range.

The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.