阅读说明：本技术 一种混凝土缓凝剂及其制作方法 (Concrete retarder and preparation method thereof ) 是由 陈剑 伍辉 陈晓泉 伍晓琪 敖克全 于 2019-09-02 设计创作，主要内容包括：本发明属于混凝土外加剂技术领域,具体涉及一种混凝土缓凝剂及其制作方法。本发明包括以下重量份原料：木质素磺酸钠10～16份、矿渣6～8份、蔗糖3～5份、磷酸氢二钠2～5份、硫酸镁3～6份、有机酸6～9份、乙烯基丙烯酸酯共聚乳液16～20份、氨基三亚甲基膦酸3～5份、甘油酯6～10份。将矿渣细磨至范围为1～10微米的微粒之后作为混凝土外加剂的原料,在复式激发下能与水泥水化产生的氢氧化钙进行水化反应,形成相应的水化放映产物,降低水化过程热量的释放,明显降低大体积混凝土中由于水化放热引起的裂缝,增加混凝土的强度。而且矿渣的添加在经过合理配比其余组分之后,可以减少混凝土中水泥的使用量,节约工程成本。(The invention belongs to the technical field of concrete admixtures, and particularly relates to a concrete retarder and a manufacturing method thereof. The invention comprises the following raw materials in parts by weight: 10-16 parts of sodium lignosulfonate, 6-8 parts of slag, 3-5 parts of cane sugar, 2-5 parts of disodium hydrogen phosphate, 3-6 parts of magnesium sulfate, 6-9 parts of organic acid, 16-20 parts of vinyl acrylate copolymer emulsion, 3-5 parts of aminotrimethylene phosphonic acid and 6-10 parts of glyceride. The slag is finely ground into particles with the range of 1-10 microns and then used as a raw material of a concrete additive, and can be subjected to hydration reaction with calcium hydroxide generated by cement hydration under compound excitation to form a corresponding hydration projection product, so that the release of heat in the hydration process is reduced, cracks caused by hydration heat release in large-volume concrete are obviously reduced, and the strength of the concrete is increased. And after the slag is added and other components are reasonably proportioned, the use amount of cement in concrete can be reduced, and the engineering cost is saved.)

1. The concrete retarder is characterized by comprising the following raw materials in parts by weight:

10-16 parts of sodium lignosulfonate, 6-8 parts of slag, 3-5 parts of cane sugar, 2-5 parts of disodium hydrogen phosphate, 3-6 parts of magnesium sulfate, 6-9 parts of organic acid, 16-20 parts of vinyl acrylate copolymer emulsion, 3-5 parts of aminotrimethylene phosphonic acid and 6-10 parts of glyceride.

2. The concrete retarder according to claim 1, characterized by comprising the following raw materials in parts by weight:

12 parts of sodium lignosulphonate, 6 parts of slag, 3 parts of cane sugar, 4 parts of disodium hydrogen phosphate, 5 parts of magnesium sulfate, 6 parts of organic acid, 18 parts of vinyl acrylate copolymer emulsion, 5 parts of aminotrimethylene phosphonic acid and 7 parts of glyceride.

3. The concrete retarder according to claim 1 or 2, wherein the organic acid is one or two of oxalic acid, malic acid or acetic acid.

4. The concrete retarder according to claim 1 or 2, wherein the slag is obtained by mixing iron slag, copper slag and aluminum slag according to a ratio of 4-7: 3-4: 1-3.

5. The concrete retarder according to claim 4, wherein the slag is a mixture of iron slag, copper slag and aluminum slag in a ratio of 5:4: 1.

6. A concrete retarder according to claim 1 or 2, wherein the glyceride comprises: one or two of glycerin monostearate, rosin glycerin ester and glycerol triacetate are mixed in any ratio.

7. The preparation method of the concrete retarder is characterized by comprising the following steps:

a. fine grinding of slag: firstly, processing slag into particles with the particle size of 1-3 cm in a crusher, and then transferring the particles into a superfine vertical mill for grinding to obtain mineral micro powder for later use;

b. partial mixing: after uniformly mixing glyceride and organic acid, adding mineral micro powder into the mixture and uniformly stirring the mixture to obtain a mixed material A; adding disodium hydrogen phosphate, magnesium sulfate, sodium lignosulfonate, sucrose and aminotrimethylene phosphonic acid into the vinyl acrylate copolymer emulsion and stirring to obtain a mixed material B;

c. ultrasonic treatment: carrying out ultrasonic treatment on the prepared mixed material A for 30-40 min, heating the mixed material B to 40-45 ℃, and keeping the temperature for 20-30 min;

d. mixing materials: and (3) uniformly stirring the mixed material A and the mixed material B after ultrasonic treatment, and standing for 40-50 min to obtain the concrete retarder.

8. The method for manufacturing the concrete retarder according to claim 6, wherein the particle size of the mineral micro powder is 1-10 microns.

9. The method for manufacturing the concrete retarder according to claim 6, wherein the frequency of the ultrasonic wave is 20-40 KHz.

Technical Field

The invention belongs to the technical field of building materials, and particularly relates to a concrete retarder and a manufacturing method thereof.

Background

The retarder is a chemical admixture widely used in concrete nowadays. It can delay the hydration rate of cement, regulate the setting time of concrete and improve the construction performance of concrete. In the production of premixed concrete, a certain amount of retarder is often required to be doped, so that the plasticity of the freshly mixed concrete is kept for a long time, and the transportation and the pouring forming of the concrete are facilitated.

With the development of society and the advent of high-performance concrete, various large-scale projects and high-rise buildings are continuously generated, the application range of the retarder is continuously expanded, and the performance requirement of the retarder is higher and higher. For example, in the construction of mass concrete, the effect of adopting a common retarder is not ideal enough, temperature cracks are easy to generate, and the strength of the concrete is reduced; in order to avoid the occurrence of cold joints in the construction process of high-rise buildings, the setting time of concrete is required to be prolonged to 24 hours or even longer. The common retarder has short action time and obviously cannot meet the requirements of construction.

Disclosure of Invention

In order to solve the problems, the invention provides a concrete retarder and a manufacturing method thereof.

A concrete retarder comprises the following raw materials in parts by weight:

10-16 parts of sodium lignosulfonate, 6-8 parts of slag, 3-5 parts of cane sugar, 2-5 parts of disodium hydrogen phosphate, 3-6 parts of magnesium sulfate, 6-9 parts of organic acid, 16-20 parts of vinyl acrylate copolymer emulsion, 3-5 parts of aminotrimethylene phosphonic acid and 6-10 parts of glyceride.

Preferably, the feed comprises the following raw materials in parts by weight:

12 parts of sodium lignosulphonate, 6 parts of slag, 3 parts of cane sugar, 4 parts of disodium hydrogen phosphate, 5 parts of magnesium sulfate, 6 parts of organic acid, 18 parts of vinyl acrylate copolymer emulsion, 5 parts of aminotrimethylene phosphonic acid and 7 parts of glyceride.

Preferably, the organic acid is one or two of oxalic acid, malic acid or acetic acid mixed at any ratio.

Preferably, the slag is obtained by mixing iron slag, copper slag and aluminum slag according to a ratio of 4-7: 3-4: 1-3.

Preferably, the slag is obtained by mixing iron slag, copper slag and aluminum slag according to a ratio of 5:4: 1.

Preferably, the glycerides comprise: one or two of glycerin monostearate, rosin glycerin ester and glycerol triacetate are mixed in any ratio.

A method for preparing a concrete retarder comprises the following steps:

a. fine grinding of slag: firstly, processing slag into particles with the particle size of 1-3 cm in a crusher, and then transferring the particles into a superfine vertical mill for grinding to obtain mineral micro powder for later use;

b. partial mixing: after uniformly mixing glyceride and organic acid, adding mineral micro powder into the mixture and uniformly stirring the mixture to obtain a mixed material A; adding disodium hydrogen phosphate, magnesium sulfate, sodium lignosulfonate, sucrose and aminotrimethylene phosphonic acid into the vinyl acrylate copolymer emulsion and stirring to obtain a mixed material B;

c. ultrasonic treatment: carrying out ultrasonic treatment on the prepared mixed material A for 30-40 min, heating the mixed material B to 40-45 ℃, and keeping the temperature for 20-30 min;

d. mixing materials: and (3) uniformly stirring the mixed material A and the mixed material B after ultrasonic treatment, and standing for 40-50 min to obtain the concrete retarder.

Preferably, the particle size range of the mineral micro powder is 1-10 microns.

Preferably, the frequency of the ultrasonic wave is 20-40 KHz.

The invention has the advantages that;

1. the concrete additive comprises slag obtained by mixing iron slag, copper slag and aluminum slag according to the ratio of 4-7: 3-4: 1-3, the slag is finely ground into particles with the range of 1-10 micrometers and then is used as a raw material of the concrete additive, and the slag can be subjected to hydration reaction with calcium hydroxide generated by cement hydration under compound excitation to form a corresponding hydration projection product, so that the release of heat in the hydration process is reduced, cracks caused by hydration heat release in large-volume concrete are obviously reduced, and the strength of the concrete is increased. And after the slag is added and other components are reasonably proportioned, the use amount of cement in concrete can be reduced, and the engineering cost is saved.

2. After the slag particles and the organic acid are mixed and subjected to microwave treatment, part of metal ions and the organic acid form a complex, the performance of the sodium lignosulfonate for reducing the hydration heat of the cement in the environment with the metal complex is obviously improved, the hydration heat of the cement is further reduced, and the generation of cracks in the construction process is reduced. The concrete coagulant prepared by matching basic substances such as vinyl acrylate copolymer emulsion, disodium hydrogen phosphate, magnesium sulfate and the like has the functions of obviously reducing the false coagulation phenomenon of concrete and improving the strength of the concrete.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments, but the technical solutions provided by the present invention include not only the contents shown in the examples.