阅读说明：本技术 一种混凝土液体速凝剂 (Concrete liquid accelerator ) 是由 刘少林 刘俊杰 田帅 廖文文 凌志 邓凯 于 2020-08-27 设计创作，主要内容包括：本发明公开了一种混凝土液体速凝剂,涉及液体速凝剂技术领域,所述具体的制备步骤包括：步骤一、按重量分别称取原料：氢氧化铝30%、氢氧化镁20%、硫酸铝50%、氢氟酸溶液35%、氟硅酸25%、添加剂1.8%、稳定剂0.8%和分散增强剂10.5%；步骤二、将步骤一中的氢氧化铝和氢氧化镁在水中进行混合,然后再加入氢氟酸溶液和氟硅酸,并在常温下进行搅拌,10min；步骤三、将步骤二制取的溶液进行加热,温度为60℃,在恒温状态下加入添加剂、稳定剂以及硫酸铝10%,搅拌30min后,加入硫酸铝40%。本发明提供的混凝土液体速凝剂,掺量低、1d强度高、水泥适应性好、生产成本低。(The invention discloses a concrete liquid accelerator, which relates to the technical field of liquid accelerators and comprises the following specific preparation steps: respectively weighing the following raw materials by weight: 30% of aluminum hydroxide, 20% of magnesium hydroxide, 50% of aluminum sulfate, 35% of hydrofluoric acid solution, 25% of fluosilicic acid, 1.8% of additive, 0.8% of stabilizer and 10.5% of dispersion enhancer; step two, mixing the aluminum hydroxide and the magnesium hydroxide in the step one in water, then adding a hydrofluoric acid solution and fluosilicic acid, and stirring at normal temperature for 10 min; and step three, heating the solution prepared in the step two at 60 ℃, adding 10% of additive, stabilizer and aluminum sulfate under a constant temperature state, stirring for 30min, and adding 40% of aluminum sulfate. The concrete liquid accelerator provided by the invention is low in doping amount, high in 1d strength, good in cement adaptability and low in production cost.)

1. The concrete liquid accelerator is characterized by comprising the following specific preparation steps:

respectively weighing the following raw materials by weight: 30% of aluminum hydroxide, 20% of magnesium hydroxide, 50% of aluminum sulfate, 35% of hydrofluoric acid solution, 25% of fluosilicic acid, 1.8% of additive, 0.8% of stabilizer and 10.5% of dispersion enhancer;

step two, mixing the aluminum hydroxide and the magnesium hydroxide in the step one in water, then adding a hydrofluoric acid solution and fluosilicic acid, and stirring at normal temperature for 10 min;

step three, heating the solution prepared in the step two at the temperature of 60 ℃, adding 10% of additive, stabilizer and aluminum sulfate in a constant temperature state, stirring for 30min, adding 40% of aluminum sulfate, starting heating, keeping the temperature at 70 ℃, and stirring for 50 min;

and step four, after the step three is completed, stopping heating, reducing the temperature of the liquid to 50 ℃, then adding the dispersion reinforcing agent in a constant temperature state, and stirring for 20min to prepare the accelerator.

2. The concrete liquid accelerator according to claim 1, wherein the additive is selected from the group consisting of sulfuric acid, hydrochloric acid and citric acid.

3. The concrete liquid accelerator as claimed in claim 1, wherein the stabilizer is precipitated hydrous magnesium silicate.

4. The concrete liquid accelerator according to claim 1, wherein the dispersion enhancer is diethanolamine.

Technical Field

The invention relates to the technical field of liquid setting accelerators, in particular to a concrete liquid setting accelerator.

Background

Along with the large-scale construction of projects such as traffic tunnels, mine roadway support, repair reinforcement, water resistance, leakage stoppage and the like, the accelerator with the rapid setting and hardening function becomes an indispensable additive for modern sprayed concrete.

The accelerator is an additive for quickly setting and hardening cement cementing materials, and has the main functions of shortening the setting time of the cementing materials, reducing resilience and improving early strength, thereby meeting the construction requirements of projects such as mine roadways, railway tunnels, rush repairs, highway slopes and the like. The application of sprayed concrete is closely related to the progress of the accelerator technology, the aluminate accelerator with higher alkali content is widely used in the engineering at present, and the accelerator is gradually discovered by people to have low 28d compressive strength ratio, strong high-alkalinity corrosivity and potential alkali-aggregate reaction hazard under the long-time practice, and the overall engineering quality and strength are seriously influenced. In order to solve this problem, the alkali-free quick-setting admixture is inoculated, and the problems of the alkali-free quick-setting admixture are improved compared with the alkali liquid quick-setting admixture, but the alkali-free quick-setting admixture still has the problems of high admixture amount, low 1d strength, poor cement adaptability and high production cost, so that the application of the alkali-free quick-setting admixture in engineering is limited, and the use ratio of the alkali liquid quick-setting admixture is still larger than that of the alkali liquid quick-setting admixture.

How to change the existing problems of the alkali-free accelerator, so that the liquid accelerator with low mixing amount, high 1d strength, good cement adaptability and low production cost needs to be solved urgently.

Disclosure of Invention

The invention aims to provide a concrete liquid accelerator, which solves the problems of high alkali-free accelerator doping amount, low 1d strength, poor cement adaptability and high production cost in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the concrete liquid accelerator is prepared by the following specific steps:

respectively weighing the following raw materials by weight: 30% of aluminum hydroxide, 20% of magnesium hydroxide, 50% of aluminum sulfate, 35% of hydrofluoric acid solution, 25% of fluosilicic acid, 1.8% of additive, 0.8% of stabilizer and 10.5% of dispersion enhancer;

step two, mixing the aluminum hydroxide and the magnesium hydroxide in the step one in water, then adding a hydrofluoric acid solution and fluosilicic acid, and stirring at normal temperature for 10 min;

and step three, heating the solution prepared in the step two at the temperature of 60 ℃, adding the additive, the stabilizer and the aluminum sulfate 10% in a constant temperature state, stirring for 30min, adding the aluminum sulfate 40%, starting heating, keeping the temperature at 70 ℃, and stirring for 50 min.

And step four, after the step three is completed, stopping heating, reducing the temperature of the liquid to 50 ℃, then adding the dispersion reinforcing agent in a constant temperature state, and stirring for 20min to prepare the accelerator.

As a still further scheme of the invention: the additive may be sulfuric acid, hydrochloric acid, and citric acid.

As a still further scheme of the invention: the stabilizing agent is precipitated hydrated magnesium silicate.

As a still further scheme of the invention: the dispersion enhancer is diethanolamine.

Compared with the prior art, the invention has the beneficial effects that: the invention discloses a concrete liquid accelerator, which is prepared by optimally proportioning an AL-F complex, namely introducing Mg into aluminum and fluoride ions under the reaction of 60 DEG C⁺And Si⁺So that the early strength of the accelerator is more reliable, the fluosilicic acid is used for replacing HF solution to prepare the accelerator, the production cost of the accelerator can be reduced, and the accelerator contains Mg⁺、Si⁺F, Al and Fe in cement⁺And CO⁺The elements can not generate legal reaction, thereby ensuring the stability and increasing the mixing amount.

Drawings

FIG. 1 is a schematic structural view of sample I according to the present invention;

FIG. 2 is a schematic structural view of sample II according to the present invention;

FIG. 3 is a schematic structural view of a sample III according to the present invention;

FIG. 4 is a schematic structural view of a specimen IV of the present invention;

FIG. 5 is a schematic structural view of a sample V of the present invention;

fig. 6 is a schematic structural diagram of sample VI of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention provides a concrete liquid accelerator, which comprises the following specific preparation steps:

respectively weighing the following raw materials by weight: 30% of aluminum hydroxide, 20% of magnesium hydroxide, 50% of aluminum sulfate, 35% of hydrofluoric acid solution, 25% of fluosilicic acid, 1.8% of additives (sulfuric acid, hydrochloric acid and citric acid), 0.8% of stabilizer (precipitated hydrous magnesium silicate) and 10.5% of dispersion enhancer (diethanolamine);

step two, mixing the aluminum hydroxide and the magnesium hydroxide in the step one in water, then adding a hydrofluoric acid solution and fluosilicic acid, and stirring at normal temperature for 10 min;

and step three, heating the solution prepared in the step two at the temperature of 60 ℃, adding the additive, the stabilizer and the aluminum sulfate 10% in a constant temperature state, stirring for 30min, adding the aluminum sulfate 40%, starting heating, keeping the temperature at 70 ℃, and stirring for 50 min.

And step four, after the step three is completed, stopping heating, reducing the temperature of the liquid to 50 ℃, then adding the dispersion reinforcing agent in a constant temperature state, and stirring for 20min to prepare the accelerator.

Further, three types of ordinary portland cements with alkali-free setting accelerators (A2) respectively meeting the national cement standards on the market and obtained by any one type of alkali-free setting accelerator (A1) and the preparation method disclosed by the invention are prepared by the following experiments: the reference cement (C1), the conch cement (C2) and the octagong cement (C3) were experimentally compared.

Mixing the alkali-free accelerator (A1) with reference cement (C1), conch cement (C2) and octagonyamine cement (C3) to prepare a sample I, a sample II and a sample III;

mixing the alkali-free accelerator (A2) with reference cement (C1), conch cement (C2) and octagonyamine cement (C3) to prepare a sample IV, a sample V and a sample VI;