阅读说明：本技术 一种钛石膏路用固化剂、其制备及其应用方法 (Titanium gypsum road curing agent, and preparation and application methods thereof ) 是由 贾致荣 李超宇 林雪峰 于 2019-11-12 设计创作，主要内容包括：本发明公开了一种钛石膏路用固化剂、其制备方法及其应用方法,属于道路工程领域,该固化剂由稳定剂(工业矿渣)、调节剂(硅酸钠、三乙醇胺等)按一定比例混合而成,通过调节剂激发稳定剂中活性物质的水化活性和火山灰活性,实现对钛石膏固化,从而将钛石膏用于公路路面底基层的填筑工程。所述固化剂的原料由以下质量比制备：稳定剂90~95％、调节剂5~10％。本发明成本低廉,节省资源,有利于环境保护,制备简单,应用方便,适用于一般道路和高等级公路钛石膏底基层的修筑。(The invention discloses a titanium gypsum road curing agent, a preparation method and an application method thereof, belonging to the field of road engineering, wherein the curing agent is prepared by mixing a stabilizer (industrial slag) and a regulator (sodium silicate, triethanolamine and the like) according to a certain proportion, and the hydration activity and the volcanic ash activity of active substances in the stabilizer are excited by the regulator to realize the curing of the titanium gypsum, so that the titanium gypsum is used for the filling engineering of a road pavement subbase layer.)

1. The titanium gypsum road curing agent is prepared from the following raw materials in parts by weight:

90 to 95 percent of stabilizer

5 to 10 percent of regulator

The stabilizer is industrial slag, and the main components of the slag comprise the following components in percentage by mass: CaO-39.4%, Al₂O₃-13.5%、SiO₂-26.4%、MgO-7.5%、Fe₂O₃-0.406%、SO₃-1.28%; the regulator is sodium silicate, triethanolamine or a mixture of the two.

2. The preparation method of the titanium gypsum road curing agent comprises the following steps:

(1) proportionally taking a stabilizer (industrial slag), drying at 60 ~ 80 ℃, grinding to ensure that the specific area is 400 ~ 500kg/m²Within the range, standby;

(2) and (2) taking the regulator (sodium silicate, triethanolamine and the like) according to the proportion, adding the regulator into the stabilizer in the step (1), and fully mixing to obtain a curing agent finished product.

3. The application method of the titanium gypsum road curing agent in claim 1, which mainly comprises the following steps:

the mixing proportion of the curing agent and the titanium gypsum in the construction process is 5 ~ 15 percent by mass.

Technical Field

The invention relates to the field of road engineering, in particular to a titanium gypsum road curing agent, a preparation method and an application method thereof.

Background

Titanium gypsum is mainly industrial waste residue generated by adding lime for neutralizing acid wastewater when titanium dioxide is produced by titanium dioxide production enterprises by adopting a sulfuric acid method, and mainly contains calcium sulfate dihydrate, the titanium gypsum is grey brown when coming out of a waste residue treatment workshop and turns red after being placed in the air for a period of time (ferrous ions are gradually oxidized into ferric ions), so that titanium gypsum is named as red gypsum, the titanium gypsum has the characteristics of higher water content, more impurities and high viscosity, and is weakly acidic, and compared with natural gypsum, the titanium gypsum has higher iron content, so the titanium gypsum has the characteristics of high viscosity, easy red change when being placed in the air and the like, so that the treatment of the titanium gypsum is difficult.

In addition, the contradiction of the shortage of natural materials in most road construction is stronger day by day, and the problems of fund shortage are faced. Therefore, on one hand, the construction quality of the highway can be ensured; on the other hand, the contradiction of shortage of natural materials can be alleviated, and the construction cost is reduced; both of these aspects are considerable problems for road construction units. In addition, the implementation of the development concept that the green-water green mountain is the Jinshan Yinshan reduces the titanium gypsum stacking amount, improves the utilization rate of the titanium gypsum and protects the environment, and is also urgently needed by relevant government departments. If the titanium gypsum can be recycled and prepared into the subbase material in the road pavement structure, the cost can be reduced, the resources can be saved, and the local environmental pollution can be reduced. Therefore, the titanium gypsum used as the base layer material in the pavement construction can not only relieve the contradiction of shortage of natural materials, but also help to solve the problem of titanium gypsum treatment, and has profound social significance and environmental protection significance.

The existing traditional semi-rigid base layer generally has a shrinkage cracking phenomenon, and the shrinkage cracking of the base layer can be reflected to a surface layer, so that the road surface is cracked, inconvenience is brought to driving, and resource waste is caused. Although many scholars and experts can compensate the shrinkage cracking phenomenon by adding a small amount of titanium gypsum into the water-stable base layer, the titanium gypsum cannot effectively relieve the current problem of stacking a large amount of titanium gypsum due to the addition of a small amount of titanium gypsum, and the expansion problem is caused if a large amount of titanium gypsum is added into the water-stable base layer. Therefore, it is a considerable problem to provide a curing agent for curing titanium gypsum as a road sub-base filling.

Disclosure of Invention

The technical task of the invention is to provide a titanium gypsum road curing agent, a preparation method and an application method thereof aiming at the defects of the prior problems.

A further technical task of the present invention is to provide a process for the preparation of the above-mentioned curing agents.

A further technical task of the present invention is to provide a method for applying the above curing agent.

The technical task of the present invention is achieved in the following manner.

The titanium gypsum road curing agent is characterized by being prepared from the following raw materials in parts by weight:

90 to 95 percent of stabilizer

5 to 10 percent of regulator

The stabilizer is industrial slag, and the main components of the slag comprise the following components in percentage by mass: CaO-39.4%, Al₂O₃-13.5%、SiO₂-26.4%、MgO-7.5%、Fe₂O₃-0.406%、SO₃1.28 percent, wherein the regulator is sodium silicate, triethanolamine or a mixture of the two, and when the regulator is a mixed reagent of triethanolamine and sodium silicate, the mass ratio of the triethanolamine to the sodium silicate is 1:1 ~ 3.

The curing agent comprises the following raw materials in percentage by mass:

94 percent of stabilizing agent

6 percent of regulator

The regulator is an alkaline compound in the prior art, but in order to achieve the best technical effect, a mixed reagent of triethanolamine and sodium silicate is preferred, and the optimal mass ratio of the triethanolamine to the sodium silicate is 1: 2.

The preparation method comprises the following steps:

(1) proportionally taking a stabilizer (industrial slag), drying at 60 ~ 80 ℃, grinding to ensure that the specific area is 400 ~ 500kg/m²And is ready for use;

(2) and (2) taking the regulator (sodium silicate, triethanolamine and the like) according to the proportion, adding the regulator into the stabilizer in the step (1), and fully mixing to obtain a curing agent finished product.

The main action mechanism of the titanium gypsum road curing agent is that under the action of the regulator, the curing agent can provide an alkaline environment for the stabilizer and excite the water of the active substanceThe chemical activity and the pozzolanic activity enable Si-O bonds and AI-O bonds in the stabilizer to be immediately broken, to rapidly participate in hydration reaction, and to be mixed with certain oxides in the titanium gypsum, thereby generating hydrated calcium silicate (C-S-H), hydrated calcium aluminate (C-A-H), hydrated calcium aluminoferrite (C-A-F-H), hydrated calcium alumino silicate (C-A-S-H), calcium hydroxide (Ca (OH)₂) Hydration products such as ettringite and the like can generate coating and adsorption effects on the titanium gypsum along with the generation of the gelling substances such as C-S-H, C-A-S-H, C-A-F-H and the like, so that the titanium gypsum is solidified, and the strength of the titanium gypsum underlayer is improved. In addition, when the mixed reagent of sodium silicate and triethanolamine is selected as the optimal regulator, the triethanolamine can accelerate the early hydration reaction and improve the early strength on the one hand; on the other hand, sodium silicate is effective in preventing CaO from forming Ca (OH)₂The expansion of (2) and the expansion due to the formation of ettringite, due to sodium silicate with calcium sulfate, Ca (OH)₂Calcium silicate (C-S-H) gel is generated in the reaction, so that the expansion of CaO and the generation of ettringite are inhibited, and the generated gel substance can play a role in solidifying the titanium gypsum. From the above, the invention of the titanium gypsum road curing agent provides a good method for titanium gypsum as a base layer filling material, can ensure the long-term performance of a road base layer, and solves the problem of environmental pollution.

In the process of laying the titanium gypsum subbase, the titanium gypsum subbase can be added into the titanium gypsum according to a certain mass ratio and can be laid after being uniformly stirred with the titanium gypsum. The titanium gypsum sub-base layer is laid in the same process as the base layer in the prior art.

The mixing proportion of the curing agent and the titanium gypsum in the construction process is 5 percent ~ 15 percent (mass percentage).

The titanium gypsum sub-base layer preferably contains less than 2 percentage points of the optimum moisture content of the titanium gypsum.

The optimum moisture content of the titanium gypsum was determined according to Highway soil test protocol (JTG E40-2007) compaction test T0131-2007.

Compared with the prior art, the titanium gypsum road curing agent, the preparation method and the application method thereof have the following advantages:

(1) the raw material used by the titanium gypsum road curing agent is industrial waste residue, and the active substance in the stabilizer is activated mainly through the regulator, so that the titanium gypsum is cured, the titanium gypsum is used for the filling engineering of the road pavement subbase, waste is changed into valuable, and the utilization additional value of the titanium gypsum is improved;

(2) the preparation method of the curing agent is simple and easy to construct;

(3) the application method of the curing agent can be widely applied to the areas lack of soil filling and the areas with high titanium gypsum solid waste yield, can reduce the mass stacking of titanium gypsum, reduce the damage of the titanium gypsum to the environment and reduce the construction cost.

Detailed Description

The titanium gypsum curing agent, the preparation method and the application method thereof of the present invention will be described in detail with specific examples.