阅读说明：本技术 隧道专用速凝防水型添加剂合成工艺 (Synthesis process of rapid-setting waterproof additive special for tunnel ) 是由 闫红光 于 2020-04-28 设计创作，主要内容包括：本发明揭示了一种隧道专用速凝防水型添加剂合成工艺,由包括乙二醇胺、氟硅酸镁、硫酸铝、氟化钠和中和料的反应原料,经过反应搅拌合成,工艺流程包括：将乙二醇胺和氟硅酸镁计量投入,并进行一次给水,混合搅拌升温至80℃,反应至透明状,得到第一混合液；将硫酸铝计量投入所述第一混合液中,并进行二次给水,混合搅拌降温至70℃～80℃,反应至均匀溶液,得到第二混合液；将氟化钠和中和料计量投入所述第二混合液中,混合搅拌,温度维持在65℃～75℃,得到隧道专用速凝防水型添加剂。本发明隧道专用速凝防水型添加剂具有安全环保、强度无损失、防水等优点,可减少对环境的危害,碱集料反应的危害,高PH值的危害以及对喷射混凝土后期强度的损失等。(The invention discloses a tunnel special quick-setting waterproof additive synthesis process, which is synthesized by reaction raw materials comprising glycol amine, magnesium fluosilicate, aluminum sulfate, sodium fluoride and a neutralizing material through reaction and stirring, and comprises the following process flows: adding glycol amine and magnesium fluosilicate in a metered manner, feeding water for the first time, mixing, stirring, heating to 80 ℃, and reacting to be transparent to obtain a first mixed solution; adding aluminum sulfate into the first mixed solution in a metering manner, feeding water for the second time, mixing, stirring, cooling to 70-80 ℃, and reacting to obtain a uniform solution to obtain a second mixed solution; and (3) adding the sodium fluoride and the neutralizing material into the second mixed solution in a metering manner, mixing and stirring, and maintaining the temperature at 65-75 ℃ to obtain the rapid-setting waterproof additive special for the tunnel. The special rapid-setting waterproof additive for the tunnel has the advantages of safety, environmental protection, no strength loss, water resistance and the like, and can reduce the harm to the environment, the harm to alkali aggregate reaction, the harm to high PH value, the loss to later strength of sprayed concrete and the like.)

1. A tunnel special-purpose rapid-hardening waterproof additive synthesis process is characterized in that the tunnel special-purpose rapid-hardening waterproof additive is synthesized by reaction raw materials comprising glycol amine, magnesium fluosilicate, aluminum sulfate, sodium fluoride and a neutralization material through reaction and stirring, and the process flow comprises the following steps:

adding glycol amine and magnesium fluosilicate in a metered manner, feeding water for the first time, mixing, stirring, heating to 80 ℃, and reacting to be transparent to obtain a first mixed solution;

adding aluminum sulfate into the first mixed solution in a metering manner, feeding water for the second time, mixing, stirring, cooling to 70-80 ℃, and reacting to obtain a uniform solution to obtain a second mixed solution;

and (3) adding the sodium fluoride and the neutralizing material into the second mixed solution in a metering manner, mixing and stirring, and maintaining the temperature at 65-75 ℃ to obtain the rapid-setting waterproof additive special for the tunnel.

2. The process of claim 1, wherein the step of adding sodium fluoride and a neutralizing agent into the second mixture, mixing and stirring the mixture at 65-75 ℃ to obtain the tunnel-dedicated quick-setting waterproof additive comprises:

stirring for 30 minutes, and adjusting the pH value to a preset pH threshold value to obtain the tunnel special rapid-setting waterproof additive.

3. The process of claim 1, wherein the step of adding sodium fluoride and a neutralizing agent into the second mixture, mixing and stirring the mixture at 65-75 ℃ to obtain the tunnel-dedicated quick-setting waterproof additive comprises:

sodium fluoride and a neutralizing agent are metered into the second mixed solution, mixed and stirred, and the temperature is maintained at 70 ℃.

4. The process of claim 1, wherein the step of adding sodium fluoride and a neutralizing agent into the second mixture, mixing and stirring the mixture at 65-75 ℃ to obtain the tunnel-dedicated quick-setting waterproof additive comprises:

and (3) cooling the tunnel special rapid-hardening waterproof additive to below 45 ℃, and then sampling and inspecting.

5. The process for synthesizing the rapid-hardening waterproof additive for tunnels according to claim 1, wherein the neutralizing agent comprises a pH regulator.

6. The process of claim 1, wherein the step of adding sodium fluoride and a neutralizing agent into the second mixture, mixing and stirring the mixture at 65-75 ℃ to obtain the tunnel-dedicated quick-setting waterproof additive comprises:

and (4) metering the complexing agent, and mixing and stirring.

7. The process of synthesizing the tunnel-dedicated quick-setting waterproof additive according to claim 1, further comprising a flow meter, wherein the feed water amount of the primary feed water and the secondary feed water is controlled by the flow meter.

Technical Field

The invention relates to the field of special additives for tunnels, in particular to a synthesis process of a special rapid-hardening waterproof additive for tunnels.

Background

The traditional accelerator additives special for tunnels are all strong-alkaline accelerators, the pH value is generally above 12, the traditional accelerator additives have strong corrosivity, and the human health is seriously damaged in production and construction. The traditional quick-setting waterproof high-efficiency additive special for the tunnel is generally powdery and has large dust in production and construction. The special rapid-setting additive for the tunnel produced and developed at present has a part of strong corrosivity and even toxicity. The developed and produced rapid-setting additive special for the tunnel at present is a rapid-setting additive special for the liquid tunnel, which has no alkali, no corrosion, no toxicity and no irritation. With the increasing concern of society on environmental problems, the awareness of constructors on health and safety is increased.

The special quick-setting waterproof high-efficiency additive for the tunnel is an additive for quickly setting and hardening cement concrete, and is mainly used for construction and rush-repair of projects such as railway tunnels, diversion culverts, mine roadways, underground projects and the like. The development of the method goes through the stage of changing from powder to liquid and from water-proof to water-proof. The water on the inner walls of tunnels, culverts and the like is large, and the influence on the general quick-setting additive is as follows: 1. water is many, and tunnel wall is last more smooth for the cohesive force between shotcrete and the wall diminishes, falls the ash easily, and it is big to cause the rebound rate of rapid hardening additive: 2. the water is more, which is equivalent to increase the water-cement ratio of the sprayed concrete, the setting time of the quick-setting additive is prolonged, and the quick-setting effect is weakened: 3. the water-cement ratio is increased, and the concrete strength is influenced. The general rapid-setting efficient additive special for the tunnel is low in price, but has the problems of high alkali content, high requirements on construction and equipment, high strength loss, strong corrosivity, long-term alkali aggregate reaction of concrete and the like. The rapid-hardening waterproof efficient additive special for the tunnel solves the problem of the conventional rapid-hardening efficient additive special for the tunnel, has the advantages of safety, environmental protection, no loss of strength, water resistance and the like, can reduce the harm to the underground construction environment, the harm to alkali aggregate reaction, the harm to high pH value in the using process, the loss to later strength of sprayed concrete and the like.

Disclosure of Invention

The invention provides a synthesis process of a rapid-hardening waterproof additive special for a tunnel, aiming at solving the problems of the damage of the traditional rapid-hardening additive special for the tunnel to the underground construction environment, the damage of alkali aggregate reaction, the damage of high PH value in the using process and the loss of later strength of sprayed concrete.

The invention provides a tunnel special rapid-hardening waterproof additive synthesis process, which is synthesized by reaction raw materials comprising glycol amine, magnesium fluosilicate, aluminum sulfate, sodium fluoride and a neutralizing material through reaction and stirring, and comprises the following process flows:

adding glycol amine and magnesium fluosilicate in a metered manner, feeding water for the first time, mixing, stirring, heating to 80 ℃, and reacting to be transparent to obtain a first mixed solution;

adding aluminum sulfate into the first mixed solution in a metering manner, feeding water for the second time, mixing, stirring, cooling to 70-80 ℃, and reacting to obtain a uniform solution to obtain a second mixed solution;

and (3) adding the sodium fluoride and the neutralizing material into the second mixed solution in a metering manner, mixing and stirring, and maintaining the temperature at 65-75 ℃ to obtain the rapid-setting waterproof additive special for the tunnel.

Further, the step of adding the sodium fluoride and the neutralizing material into the second mixed solution in a metering manner, mixing and stirring the mixture, and maintaining the temperature at 65-75 ℃ to obtain the tunnel special rapid-hardening waterproof additive comprises the following steps:

stirring for 30 minutes, and adjusting the pH value to a preset pH threshold value to obtain the tunnel special rapid-setting waterproof additive.

Further, the step of adding the sodium fluoride and the neutralizing material into the second mixed solution in a metering manner, mixing and stirring the mixture, and maintaining the temperature at 65-75 ℃ to obtain the tunnel special rapid-hardening waterproof additive comprises the following steps:

sodium fluoride and a neutralizing agent are metered into the second mixed solution, mixed and stirred, and the temperature is maintained at 70 ℃.

Further, the step of adding the sodium fluoride and the neutralizing material into the second mixed solution in a metering manner, mixing and stirring the mixture, maintaining the temperature at 65-75 ℃ and obtaining the tunnel special rapid-hardening waterproof additive comprises the following steps:

and (3) cooling the tunnel special rapid-hardening waterproof additive to below 45 ℃, and then sampling and inspecting.

Further, the neutralizing agent includes a PH adjusting agent.

Further, the step of adding the sodium fluoride and the neutralizing material into the second mixed solution in a metering manner, mixing and stirring the mixture, and maintaining the temperature at 65-75 ℃ to obtain the tunnel special rapid-hardening waterproof additive comprises the following steps:

and (4) metering the complexing agent, and mixing and stirring.

Furthermore, the system also comprises a flowmeter, and the water supply amount of the primary water supply and the secondary water supply is controlled by the flowmeter.

According to the technical scheme, the invention has the beneficial effects that: the tunnel special quick-setting waterproof additive has the advantages of safety, environmental protection, no strength loss, water resistance and the like, and can reduce the damage to the underground construction environment, the damage to alkali aggregate reaction, the damage to high PH value in the use process, the loss to the later strength of sprayed concrete and the like.

Drawings

FIG. 1 is a flow chart of a process for synthesizing a rapid-setting waterproof additive for tunnels, which is provided by the embodiment of the invention;

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.

As used herein, the singular forms "a", "an", "the" and "the" include plural referents unless the content clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, units, modules, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As shown in figure 1, the invention provides a tunnel special rapid-hardening waterproof additive synthesis process, which is synthesized by reaction and stirring of reaction raw materials comprising glycol amine, magnesium fluosilicate, aluminum sulfate, sodium fluoride and a neutralizing material, and the process flow comprises the following steps:

s1: adding glycol amine and magnesium fluosilicate in a metered manner, feeding water for the first time, mixing, stirring, heating to 80 ℃, and reacting to be transparent to obtain a first mixed solution;

s2: adding aluminum sulfate into the first mixed solution in a metering manner, feeding water for the second time, mixing, stirring, cooling to 70-80 ℃, and reacting to obtain a uniform solution to obtain a second mixed solution;

s3: and (3) adding the sodium fluoride and the neutralizing material into the second mixed solution in a metering manner, mixing and stirring, and maintaining the temperature at 65-75 ℃ to obtain the rapid-setting waterproof additive special for the tunnel.

As described in S1, adding glycol amine and magnesium fluorosilicate in a metered amount, feeding water for the first time, mixing, stirring, heating to 80 ℃, and reacting to obtain a transparent first mixed solution; after the rapid-setting waterproof additive special for the tunnel is mixed, the slurry structure is too fast to be condensed, and pores cannot be easily filled, so that the 28d compressive strength is lost, the solubility product constant of magnesium hydroxide is 6 orders of magnitude smaller than that of calcium hydroxide, magnesium ions can be preferentially combined with hydroxyl ions to generate magnesium hydroxide for crystal nuclei, gel is precipitated from tricalcium silicate to fill the pores in time, and magnesium ions can be introduced in the preparation of the rapid-setting waterproof additive special for the tunnel to ensure that the later strength of the cement stone is not lost.

As described in the above S2, the aluminum sulfate is metered into the first mixed solution, and water is supplied for the second time, and the mixture is stirred and cooled to 70 ℃ to 80 ℃, and the reaction is carried out to a uniform solution, so as to obtain a second mixed solution; the aluminum sulfate series liquid tunnel special quick-setting waterproof additive has the contradiction between the mixing amount and the stability, and if the stability of the tunnel special quick-setting waterproof additive is improved, excessive aluminum sulfate cannot be dissolved in the solution, so that the reduction of the effective components inevitably increases the mixing amount of the tunnel special quick-setting waterproof additive. The tunnel special quick-setting waterproof additive mainly plays a role in quick setting, so that a raw material with high alumina content can be selected, and the polyaluminium sulfate has the alumina content of more than 17 percent, so that the tunnel special quick-setting waterproof additive is a preferable raw material.

As described in the above S3, the sodium fluoride and the neutralizing material are metered into the second mixed solution, mixed and stirred, and the temperature is maintained at 65 ℃ to 75 ℃ to obtain the tunnel special rapid-hardening waterproof additive; the pH value of the solution is reduced, hydrolysis reaction can be inhibited, a neutralizing material can be added to improve the stability of the special quick-setting waterproof additive for the liquid tunnel, the sodium fluoride can play a role in corrosion prevention, steel bars are prevented from being corroded, the construction environment is friendly, and the damage to the bodies of construction workers is small. Because the tunnel special quick-setting waterproof high-efficiency additive does not contain a large amount of alkaline substances in the traditional tunnel special quick-setting additive, the damage effect on concrete caused by the introduction of the alkaline substances, such as alkali aggregate reaction, is greatly reduced; and the content of chloride ions is strictly limited, so that the possibility of corrosion of the steel bars is reduced.

In this embodiment, the step S3 includes: stirring for 30 minutes, and adjusting the pH value to a preset pH threshold value to obtain the tunnel special rapid-setting waterproof additive. The slurry is stirred for 30 minutes to reach the state of the optimal slurry, the pH value is neutral or slightly acidic, the corrosive damage to the skin and the body health of constructors can not be generated, and the higher pH value can generate higher influence on the bodies of the constructors.

In this embodiment, the step S3 includes: sodium fluoride and a neutralizing agent are metered into the second mixed solution, mixed and stirred, and the temperature is maintained at 70 ℃. The temperature is maintained at 70 ℃ to reach the optimal reaction temperature, so that the effect of the tunnel special quick-setting waterproof additive synthesized by the reaction is the best.

In this embodiment, step S3 includes the following steps: and (3) cooling the tunnel special rapid-hardening waterproof additive to below 45 ℃, and then sampling and inspecting. The tunnel-dedicated rapid-hardening waterproof additive synthesized by the final reaction is inspected to determine whether the performance of the tunnel-dedicated rapid-hardening waterproof additive reaches the technical index, and in this embodiment, the technical index of the tunnel-dedicated rapid-hardening waterproof additive is as follows: density: 1.25-1.37 g/ml; solid content: 30-40%; pH value: 2.0 to 4.0; the initial setting time of the clear paste is less than 5min, and the final setting time is less than 10 min; 1d, the compressive strength is more than 7 Mpa; the 28d compressive strength ratio is more than 90 percent; the alkali content is less than 0.2 percent (based on the solid content); the content of chloride ions is less than 0.01 percent (calculated by solid content); the air permeability coefficient is less than 10-9 cm/s; the rust-proof effect on the steel bars is avoided; the rebound resilience is less than 10 percent.

The neutralizing agent comprises a pH regulator. The PH regulator can improve the stability of the special quick-setting waterproof additive for the liquid tunnel, and can regulate the PH value of the special quick-setting waterproof additive for the tunnel, the PH value is neutral or slightly acidic, corrosive damage to the skin and the body health of constructors cannot be caused, and the higher PH value can generate higher influence on the bodies of the constructors.

In this embodiment, the step S3 includes: and (4) metering the complexing agent, and mixing and stirring. The poor stability of the special quick-setting additive for the aluminum sulfate series liquid tunnel is caused by the fact that the solution is changed into irreversible gel state due to the crystallization of the highly saturated aluminum sulfate solution and the hydrolysis-polymerization-precipitation reaction of aluminum ions in water. The pH value of the solution can be reduced to inhibit hydrolysis reaction, and the complexing agent is used for complexing aluminum ions to form soluble complex ions, so that the crystallization and hydrolysis of aluminum sulfate can be inhibited.

In this embodiment, a flow meter is further included, and the feed water amount of the primary feed water and the secondary feed water is controlled by the flow meter. The water supply quantity of the primary water supply and the water supply quantity of the secondary water supply can be controlled through the flowmeter, the phenomenon that the tunnel wall is smooth due to the fact that the water content of the tunnel special quick-setting waterproof additive synthesized by the final reaction is too large is prevented, the binding force between sprayed concrete and the wall is reduced, ash is easy to fall, and the rebound rate of the quick-setting additive is large; the water-gel ratio of the sprayed concrete is increased, so that the setting time of the rapid-setting waterproof additive special for the tunnel is prolonged, and the rapid-setting effect is weakened; the water-cement ratio of the sprayed concrete is increased, and the concrete strength is influenced.

In conclusion, the invention has the beneficial effects that: the special rapid-hardening waterproof additive for the tunnel has the advantages of safety, environmental protection, no loss of strength, water resistance and the like, dust cannot appear in the construction process of the special rapid-hardening waterproof additive for the tunnel, no pollution is caused, the harm to the underground construction environment can be reduced, the harm to alkali aggregate reaction is avoided, the harm to high PH value in the use process and the loss to later strength of sprayed concrete are avoided, in the construction of the sprayed concrete, the special rapid-hardening waterproof efficient additive for the tunnel can enable mortar or concrete to be rapidly solidified and hardened in a short time, and the later strength is guaranteed not to be lost.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.