阅读说明：本技术 一种缓凝型混凝土外加剂及其制备方法 (Retarding concrete admixture and preparation method thereof ) 是由 乔永亮 王思宇 刘奇 于 2020-11-30 设计创作，主要内容包括：本发明公开了一种缓凝型混凝土外加剂及其制备方法,包括缓凝组份、减水组份、旱强组份、保水组份和水,缓凝组份、减水组份、旱强组份、保水组份和水的重量份为：缓凝组份25-35份、减水组份10-18份、旱强组份45-55份、保水组份8-16份和水85-135份,缓凝组份包括葡萄糖酸钠10-18份、蔗糖10-18份、柠檬酸6-12份、磷酸盐4-10份、麦芽糊精12-22份、辅助组份3-9份,将缓凝组分、旱强组份、减水组份、保水组份及水按照一定配比得到的混凝土外加剂,在保证外加剂使用各项指标达标的基础上,抑制水泥中C3A或石膏水化速度、延长凝结时间方面有着显著的提升,同时提高混凝土抗裂性,体现出外加剂在混凝土效果上的突出作用,满足了在凝结时间上有特殊要求的混凝土制作和相关施工的开展。(The invention discloses a retarding concrete admixture and a preparation method thereof, wherein the retarding concrete admixture comprises a retarding component, a water reducing component, a drought strength component, a water retention component and water, and the retarding component, the water reducing component, the drought strength component, the water retention component and the water comprise the following components in parts by weight: 25-35 parts of retarding component, 10-18 parts of water reducing component, 45-55 parts of drought strength component, 8-16 parts of water retaining component and 85-135 parts of water, wherein the retarding component comprises 10-18 parts of sodium gluconate, 10-18 parts of cane sugar, 6-12 parts of citric acid, 4-10 parts of phosphate, 12-22 parts of maltodextrin and 3-9 parts of auxiliary component, and the retarding component, the drought strength component, the water reducing component, the water retaining component and the water are mixed according to a certain proportion to obtain a concrete admixture, on the basis of ensuring that each index of the additive reaches the standard, the hydration speed of C3A or gypsum in cement is inhibited, the setting time is prolonged, the improvement is remarkable, meanwhile, the crack resistance of the concrete is improved, the outstanding effect of the admixture on the concrete effect is reflected, and the concrete preparation with special requirements on the setting time and the development of related construction are met.)

1. The retarding concrete admixture is characterized by comprising a retarding component, a water reducing component, a drought strength component, a water retention component and water, wherein the retarding component, the water reducing component, the drought strength component, the water retention component and the water comprise the following components in parts by weight: 25-35 parts of retarding component, 10-18 parts of water reducing component, 45-55 parts of drought strength component, 8-16 parts of water retention component and 85-135 parts of water;

the retarding component comprises sodium gluconate, citric acid, phosphate, maltodextrin and auxiliary components, wherein the weight parts of the components are as follows: 10-18 parts of sodium gluconate, 10-18 parts of sucrose, 6-12 parts of citric acid, 4-10 parts of phosphate, 12-22 parts of maltodextrin and 3-9 parts of auxiliary components;

the water reducing component comprises polyethylene glycol acrylate, acrylic acid, sodium sulfanilate, sodium hydroxide and dicyandiamide, wherein the weight parts of the components are as follows: 6-10 parts of acrylic acid polyethylene glycol ester, 8-14 parts of acrylic acid, 8-14 parts of sodium sulfanilate, 0.8-2 parts of sodium hydroxide and 1.2-2.4 parts of dicyandiamide;

the dry strength components comprise anhydrous calcium sulphoaluminate powder, gypsum powder, sodium sulfate and sodium carbonate, wherein the dry strength components comprise the following components in parts by weight: 15-25 parts of anhydrous calcium sulphoaluminate powder, 4-12 parts of gypsum powder, 3-10 parts of sodium sulfate and 3-10 parts of sodium carbonate;

the water retention component comprises 10-14 parts of acrylamide, 3-8 parts of potassium acrylate and 0.4-1.2 parts of a cross-linking agent.

2. The slow-setting concrete admixture according to claim 1, wherein the auxiliary component in the slow-setting component is one or a mixture of two of sodium hexametaphosphate and sodium pyrophosphate.

3. The retarding concrete admixture according to claim 1, wherein the retarding component, the water reducing component, the dry strength component, the water retention component and the water are in parts by weight: 28-32 parts of retarding component, 13-16 parts of water reducing component, 48-53 parts of drought strength component, 10-15 parts of water retention component and 95-125 parts of water:

the retarding component comprises the following components in parts by weight: 12-16 parts of sodium gluconate, 12-17 parts of sucrose, 8-11 parts of citric acid, 6-9 parts of phosphate, 14-19 parts of maltodextrin and 4-7 parts of auxiliary components;

the water reducing component comprises the following components in parts by weight: 7-9 parts of acrylic acid polyethylene glycol ester, 9-12 parts of acrylic acid, 9-12 parts of sodium sulfanilate, 1.2-1.8 parts of sodium hydroxide and 1.6-2.2 parts of dicyandiamide;

the drought strength component comprises the following components in parts by weight: 17-22 parts of anhydrous calcium sulphoaluminate powder, 6-10 parts of gypsum powder, 5-9 parts of sodium sulfate and 4-8 parts of sodium carbonate;

the water-retaining component comprises, by weight, 11-13 parts of acrylamide, 4-6 parts of potassium acrylate and 0.6-1.0 part of a cross-linking agent.

4. The retarding concrete admixture according to claim 1, wherein the retarding component, the water reducing component, the dry strength component, the water retention component and the water are in parts by weight: 30 parts of retarding component, 14.5 parts of water reducing component, 50 parts of drought strength component, 13 parts of water retention component and 114 parts of water;

the retarding component comprises the following components in parts by weight: 14 parts of sodium gluconate, 15 parts of cane sugar, 9.5 parts of citric acid, 8.5 parts of phosphate, 16 parts of maltodextrin and 6 parts of auxiliary components;

the water reducing component comprises the following components in parts by weight: 8 parts of acrylic acid polyethylene glycol ester, 10 parts of acrylic acid, 10 parts of sodium sulfanilate, 1.6 parts of sodium hydroxide and 1.8 parts of dicyandiamide;

the drought strength component comprises the following components in parts by weight: 19 parts of anhydrous calcium sulphoaluminate powder, 9 parts of gypsum powder, 7 parts of sodium sulfate and 6 parts of sodium carbonate;

the water retention component comprises 12 parts of acrylamide, 5 parts of potassium acrylate and 0.8 part of cross-linking agent.

5. A method for preparing the slow-setting concrete admixture according to any one of claims 1 to 4, which comprises the following steps:

1) preparation of a retarding component: weighing quantitative sodium gluconate, sucrose, citric acid, phosphate, maltodextrin and auxiliary components, placing the maltodextrin, the sucrose and the phosphate into a drying container, stirring uniformly, sequentially adding the sodium gluconate, the citric acid and the auxiliary components, and fully stirring to obtain a retarding component;

2) preparing a water reducing component: weighing quantitative gadoleic acid polyethylene glycol ester, acrylic acid, sodium sulfanilate, sodium hydroxide, dicyandiamide and water, putting gadoleic acid polyethylene glycol ester, acrylic acid, sodium sulfanilate, dicyandiamide and water into a reaction kettle, uniformly stirring, heating, adjusting the pH value of the reaction kettle by using sodium hydroxide, and heating and drying the mixed liquid after the pH value is more than 10 to obtain a powdery water reducing component;

3) preparing a dry strength component: weighing quantitative anhydrous calcium sulphoaluminate powder, gypsum powder, sodium sulfate and sodium carbonate,

stirring anhydrous calcium sulphoaluminate powder, gypsum powder, sodium sulfate and sodium carbonate uniformly in a drying vessel to obtain a drought strength component;

4) preparing a water-retaining component: weighing quantitative acrylamide, potassium acrylate and a crosslinking agent, uniformly mixing the acrylamide and the potassium acrylate, placing the mixture into a heating vessel, adding the crosslinking agent, continuously heating and stirring to obtain white granular crystals and obtain a water retention component;

5) and putting the reserved retarding component, the dry strength component, the water reducing component, the water retaining component and water into a container for later use according to a fixed amount, putting the dry strength component, the water reducing component and the water retaining component into the water in sequence, adding the retarding component, and fully stirring to obtain the concrete admixture finished product.

Technical Field

The invention relates to the technical field of engineering materials and preparation thereof, in particular to a retarding concrete admixture and a preparation method thereof.

Background

The concrete admixture is a chemical substance which is added in the process of stirring the concrete and is used for improving the performance of the concrete, accounts for less than 5 percent of the mass of the cementing material, and can obviously improve the performance of the concrete. The concrete admixture has the characteristics of multiple varieties, small mixing amount, great influence on the performance of concrete, low investment, quick response and obvious technical and economic benefits. With the continuous progress of scientific technology, the additive has been used more and more, and the additive has become the 5 th important component of concrete besides 4 basic components.

The concrete admixture comprises multiple functional components such as a retarder, a water reducing agent, an early strength admixture, a moisture-proof agent, a coloring agent and the like, and the components are mutually blended, and the concrete required by construction is prepared by selecting the applicable concrete admixture according to requirements. However, in the actual use process, although various concrete admixtures in the prior art have the effect of retarding setting, reduce the hydration speed of cement or gypsum and prolong the setting time, the effect of retarding setting is still limited, and concrete preparation which can not meet some special requirements is not achieved, so that a concrete admixture with outstanding retarding setting effect and a preparation method thereof are needed.

Disclosure of Invention

The invention aims to provide a retarding concrete admixture and a preparation method thereof, which aim to solve the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

the retarding concrete admixture comprises a retarding component, a water reducing component, a drought strength component, a water retention component and water, wherein the retarding component, the water reducing component, the drought strength component, the water retention component and the water comprise the following components in parts by weight: 25-35 parts of retarding component, 10-18 parts of water reducing component, 45-55 parts of drought strength component, 8-16 parts of water retention component and 85-135 parts of water;

the retarding component comprises sodium gluconate, citric acid, phosphate, maltodextrin and auxiliary components, wherein the weight parts of the components are as follows: 10-18 parts of sodium gluconate, 10-18 parts of sucrose, 6-12 parts of citric acid, 4-10 parts of phosphate, 12-22 parts of maltodextrin and 3-9 parts of auxiliary components;

the water reducing component comprises polyethylene glycol acrylate, acrylic acid, sodium sulfanilate, sodium hydroxide and dicyandiamide, wherein the weight parts of the components are as follows: 6-10 parts of acrylic acid polyethylene glycol ester, 8-14 parts of acrylic acid, 8-14 parts of sodium sulfanilate, 0.8-2 parts of sodium hydroxide and 1.2-2.4 parts of dicyandiamide;

the dry strength components comprise anhydrous calcium sulphoaluminate powder, gypsum powder, sodium sulfate and sodium carbonate, wherein the dry strength components comprise the following components in parts by weight: 15-25 parts of anhydrous calcium sulphoaluminate powder, 4-12 parts of gypsum powder, 3-10 parts of sodium sulfate and 3-10 parts of sodium carbonate;

the water retention component comprises 10-14 parts of acrylamide, 3-8 parts of potassium acrylate and 0.4-1.2 parts of a cross-linking agent.

As a further scheme of the invention: the auxiliary component in the retarding component is one or a mixture of two of sodium hexametaphosphate and sodium pyrophosphate.

As a still further scheme of the invention: the retarding component, the water reducing component, the drought strength component, the water retention component and the water comprise the following components in parts by weight: 28-32 parts of retarding component, 13-16 parts of water reducing component, 48-53 parts of drought strength component, 10-15 parts of water retention component and 95-125 parts of water;

the retarding component comprises the following components in parts by weight: 12-16 parts of sodium gluconate, 12-17 parts of sucrose, 8-11 parts of citric acid, 6-9 parts of phosphate, 14-19 parts of maltodextrin and 4-7 parts of auxiliary components;

the water reducing component comprises the following components in parts by weight: 7-9 parts of acrylic acid polyethylene glycol ester, 9-12 parts of acrylic acid, 9-12 parts of sodium sulfanilate, 1.2-1.8 parts of sodium hydroxide and 1.6-2.2 parts of dicyandiamide;

the drought strength component comprises the following components in parts by weight: 17-22 parts of anhydrous calcium sulphoaluminate powder, 6-10 parts of gypsum powder, 5-9 parts of sodium sulfate and 4-8 parts of sodium carbonate;

the water-retaining component comprises, by weight, 11-13 parts of acrylamide, 4-6 parts of potassium acrylate and 0.6-1.0 part of a cross-linking agent.

As a still further scheme of the invention: the retarding component, the water reducing component, the drought strength component, the water retention component and the water comprise the following components in parts by weight: 30 parts of retarding component, 14.5 parts of water reducing component, 50 parts of drought strength component, 13 parts of water retention component and 114 parts of water;

the retarding component comprises the following components in parts by weight: 14 parts of sodium gluconate, 15 parts of cane sugar, 9.5 parts of citric acid, 8.5 parts of phosphate, 16 parts of maltodextrin and 6 parts of auxiliary components;

the water reducing component comprises the following components in parts by weight: 8 parts of acrylic acid polyethylene glycol ester, 10 parts of acrylic acid, 10 parts of sodium sulfanilate, 1.6 parts of sodium hydroxide and 1.8 parts of dicyandiamide;

the drought strength component comprises the following components in parts by weight: 19 parts of anhydrous calcium sulphoaluminate powder, 9 parts of gypsum powder, 7 parts of sodium sulfate and 6 parts of sodium carbonate;

the water retention component comprises 12 parts of acrylamide, 5 parts of potassium acrylate and 0.8 part of cross-linking agent.

The application also aims to provide a preparation method of the retarding concrete admixture, which comprises the following steps:

1. preparation of a retarding component: weighing quantitative sodium gluconate, sucrose, citric acid, phosphate, maltodextrin and auxiliary components, placing the maltodextrin, the sucrose and the phosphate into a drying container, stirring uniformly, sequentially adding the sodium gluconate, the citric acid and the auxiliary components, and fully stirring to obtain a retarding component;

2. preparing a water reducing component: weighing quantitative gadoleic acid polyethylene glycol ester, acrylic acid, sodium sulfanilate, sodium hydroxide, dicyandiamide and water, putting gadoleic acid polyethylene glycol ester, acrylic acid, sodium sulfanilate, dicyandiamide and water into a reaction kettle, uniformly stirring, heating, adjusting the pH value of the reaction kettle by using sodium hydroxide, and heating and drying the mixed liquid after the pH value is more than 10 to obtain a powdery water reducing component;

3. preparing a dry strength component: weighing quantitative anhydrous calcium sulphoaluminate powder, gypsum powder, sodium sulfate and sodium carbonate, and uniformly stirring the anhydrous calcium sulphoaluminate powder, the gypsum powder, the sodium sulfate and the sodium carbonate in a drying vessel to obtain a drought strength component;

4. preparing a water-retaining component: weighing quantitative acrylamide, potassium acrylate and a crosslinking agent, uniformly mixing the acrylamide and the potassium acrylate, placing the mixture into a heating vessel, adding the crosslinking agent, continuously heating and stirring to obtain white granular crystals and obtain a water retention component;

5. and putting the reserved retarding component, the dry strength component, the water reducing component, the water retaining component and water into a container for later use according to a fixed amount, putting the dry strength component, the water reducing component and the water retaining component into the water in sequence, adding the retarding component, and fully stirring to obtain the concrete admixture finished product.

Compared with the prior art, the invention has the beneficial effects that: the concrete admixture is obtained by the retarding component, the dry strength component, the water reducing component, the water retention component and water according to a certain proportion, on the basis of ensuring that each index of the admixture is up to the standard, the hydration speed of cement or gypsum is reduced, and the setting time is prolonged, thereby showing the outstanding effect of the admixture on the concrete effect, meeting the development of concrete preparation and related construction with special requirements on the setting time, and having strong practicability and easy use and popularization.

Detailed Description

The technical solutions in the embodiments of the present invention will be 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.

Example 1:

1. preparation of a retarding component: weighing 10 parts of sodium gluconate, 10 parts of sucrose, 6 parts of citric acid, 4 parts of phosphate, 12 parts of maltodextrin and 3 parts of auxiliary components, placing the maltodextrin and the phosphate into a drying container, stirring uniformly, then sequentially adding the sodium gluconate, the citric acid and the auxiliary components, and fully stirring to obtain a retarding component;

2. preparing a water reducing component: weighing 6 parts of gadoleic acid polyethylene glycol ester, 8 parts of acrylic acid, 8 parts of sodium sulfanilate, 0.8 part of sodium hydroxide, 1.2 parts of dicyandiamide and 22 parts of water, putting the gadoleic acid polyethylene glycol ester, the acrylic acid, the sodium sulfanilate, the dicyandiamide and the water into a reaction kettle, uniformly stirring, heating, adjusting the pH value of the reaction kettle by the sodium hydroxide, and heating and drying the mixed liquid to obtain a powdery water reducing component after the pH value is more than 10;

3. preparing a dry strength component: weighing 15 parts of anhydrous calcium sulphoaluminate powder, 4 parts of gypsum powder, 3 parts of sodium sulfate and 3 parts of sodium carbonate, and uniformly stirring the anhydrous calcium sulphoaluminate powder, the gypsum powder, the sodium sulfate and the sodium carbonate in a drying vessel to obtain a drought strength component;

4. preparing a water-retaining component: weighing 10 parts of acrylamide, 3 parts of potassium acrylate and 0.4 part of cross-linking agent, uniformly mixing the acrylamide and the potassium acrylate, putting the mixture into a heating vessel, adding the cross-linking agent, continuously heating and stirring to obtain white granular crystals and obtain a water retention component;

5. 25 parts of retarding component, 10 parts of water reducing component, 45 parts of dry strength component, 8 parts of water retaining component and 85 parts of water are prepared for standby application, water is firstly put into a container, then the dry strength component, the water reducing component and the water retaining component are put into the water in sequence, and finally the retarding component is added, and after full stirring, the concrete admixture finished product is prepared.

Example 2:

1. preparation of a retarding component: weighing 18 parts of sodium gluconate, 18 parts of sucrose, 12 parts of citric acid, 10 parts of phosphate, 22 parts of maltodextrin and 9 parts of auxiliary components, placing the maltodextrin and the phosphate into a drying container, stirring uniformly, then sequentially adding the sodium gluconate, the citric acid and the auxiliary components, and fully stirring to obtain a retarding component;

2. preparing a water reducing component: weighing 10 parts of gadoleic acid polyethylene glycol ester, 14 parts of acrylic acid, 14 parts of sodium sulfanilate, 2 parts of sodium hydroxide, 2.4 parts of dicyandiamide and 26 parts of water, putting the gadoleic acid polyethylene glycol ester, the acrylic acid, the sodium sulfanilate, the dicyandiamide and the water into a reaction kettle, uniformly stirring, heating, adjusting the pH value of the reaction kettle by the sodium hydroxide, and heating and drying the mixed liquid to obtain a powdery water reducing component after the pH value is more than 10;

3. preparing a dry strength component: weighing 25 parts of anhydrous calcium sulphoaluminate powder, 12 parts of gypsum powder, 10 parts of sodium sulfate and 10 parts of sodium carbonate, and uniformly stirring the anhydrous calcium sulphoaluminate powder, the gypsum powder, the sodium sulfate and the sodium carbonate in a drying vessel to obtain a drought strength component;

4. preparing a water-retaining component: weighing 14 parts of acrylamide, 8 parts of potassium acrylate and 1.2 parts of a cross-linking agent, uniformly mixing the acrylamide and the potassium acrylate, putting the mixture into a heating vessel, adding the cross-linking agent, continuously heating and stirring to obtain white granular crystals and obtain a water retention component;

5. preparing 35 parts of retarding component, 18 parts of water reducing component, 55 parts of dry strength component, 16 parts of water retaining component and 135 parts of water for later use, firstly putting water into a container, then putting the dry strength component, the water reducing component and the water retaining component into the water in sequence, finally adding the retarding component, and fully stirring to obtain the concrete admixture finished product.

Example 3:

1. preparation of a retarding component: weighing 14 parts of sodium gluconate, 15 parts of cane sugar, 9.5 parts of citric acid, 8.5 parts of phosphate, 16 parts of maltodextrin and 6 parts of auxiliary components, placing the maltodextrin and the phosphate into a drying container, stirring uniformly, then sequentially adding the sodium gluconate, the citric acid and the auxiliary components, and fully stirring to obtain a retarding component;

2. preparing a water reducing component: weighing 8 parts of gadoleic acid polyethylene glycol ester, 10 parts of acrylic acid, 10 parts of sodium sulfanilate, 1.6 parts of sodium hydroxide, 1.8 parts of dicyandiamide and 24 parts of water, putting the gadoleic acid polyethylene glycol ester, the acrylic acid, the sodium sulfanilate, the dicyandiamide and the water into a reaction kettle, uniformly stirring, heating, adjusting the pH value of the reaction kettle by the sodium hydroxide, and heating and drying the mixed liquid to obtain a powdery water reducing component after the pH value is more than 10;

3. preparing a dry strength component: weighing 19 parts of anhydrous calcium sulphoaluminate powder, 9 parts of gypsum powder, 7 parts of sodium sulfate and 36 parts of sodium carbonate, and uniformly stirring the anhydrous calcium sulphoaluminate powder, the gypsum powder, the sodium sulfate and the sodium carbonate in a drying vessel to obtain a drought strength component;

4. preparing a water-retaining component: weighing 12 parts of acrylamide, 5 parts of potassium acrylate and 0.8 part of cross-linking agent, uniformly mixing the acrylamide and the potassium acrylate, putting the mixture into a heating vessel, adding the cross-linking agent, continuously heating and stirring to obtain white granular crystals and obtain a water retention component;

5. preparing 30 parts of retarding component, 14.5 parts of water reducing component, 50 parts of drought strength component, 13 parts of water retaining component and 114 parts of water for later use, firstly putting water into a container, then putting the drought strength component, the water reducing component and the water retaining component into the water in sequence, finally adding the retarding component, and fully stirring to obtain the concrete admixture finished product.

The concrete admixtures of examples 1, 2 and 3 were added to the same standard concrete preparation to obtain various experimental data after testing, and the properties obtained by testing are shown in table 1 below (the same experimental data of the existing admixtures under the same conditions), compared with the tested concrete of the existing admixtures, the concrete admixtures of examples 1, 2 and 3 all achieve the ideal effects from the test results of the delayed setting time, the compressive strength ratio, the slump loss with time, the shrinkage ratio and the like, wherein the effect of example 3 is the best (see table 1).

Experimental data

TABLE 1

The concrete admixture obtained by the retarding component, the dry strength component, the water reducing component, the water retention component and water according to a certain proportion can be obtained, on the basis of ensuring that each index of the admixture reaches the standard, the hydration speed of cement or gypsum is reduced, the setting time is prolonged, the outstanding effect of the admixture on the concrete effect is reflected, the concrete preparation with special requirements on the setting time and the development of related construction are met, the practicability is strong, and the concrete admixture is easy to use and popularize.

In the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, in the description of the present invention, "a plurality" means two or more unless otherwise specified. A feature defined as "first," "second," etc. may explicitly or implicitly include one or more of the feature.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.