Shield mortar with high solid waste mixing amount and preparation method of shield mortar

Abstract

The invention discloses shield mortar with high solid waste content. The shield mortar comprises the following components in parts by weight: 30-60 parts of cement, 300-440 parts of slag, 120-200 parts of fly ash, 300-550 parts of tailing sand and 5-10 parts of a shield mortar additive, the shield mortar admixture is prepared from the following components in parts by weight: 200 to 500 parts of exciting agent, 50 to 100 parts of water reducing agent, 20 to 50 parts of thickening agent and 350 to 730 parts of filler. According to the shield mortar, the solid waste utilization rate reaches 90% or above, the cement consumption is reduced, the cost is reduced, and the performance meets the engineering requirements.

Description

Technical Field

[0001] The invention relates to the field of mortar, in particular to a shield mortar with a high content of solid waste and a preparation method thereof. Background Art

[0002] Shield mortar is generally made of cement, mineral admixtures, bentonite, fine sand, and admixtures in a certain proportion. Each material is accurately measured and then mixed evenly. After production in the factory, it is transported to the construction site by a professional transport vehicle and stored in a mortar storage tank for use. During construction, mechanical stirring is used to accurately control the amount of water added to form a grouting liquid. Finally, the slurry is pressurized by a grouting pump and transported to the pouring site. The pollution of dust and noise to the environment is reduced during transportation and use, and there is less waste of materials, which is conducive to civilized construction. At the same time, the mortar has been strictly scientifically proportioned and strictly produced. The quality is reliable, which ensures the quality of grouting construction.

[0003] Slag, fly ash and tailings are all industrial solid wastes, which have been widely used in the field of building materials production. Using solid waste to produce building materials can not only make rational use of waste resources, protect the environment, and achieve sustainable lightweight productivity, but also reduce production costs and energy consumption, which has good economic benefits. Summary of the invention

[0004] Purpose of the invention: The technical problem to be solved by the present invention is to provide a shield mortar with a high content of solid waste and a preparation method thereof in view of the deficiencies in the prior art.

[0005] In order to solve the above technical problems, the present invention discloses a shield mortar with a high amount of solid waste, comprising the following components by weight: 30-60 parts of cement, 300-440 parts of slag, 120-200 parts of fly ash, 300-550 parts of tailings sand, and 5-10 parts of shield mortar admixture; the weight components of the shield mortar admixture are: 200-500 parts of activator, 50-100 parts of water reducer, 20-50 parts of thickener, and 350-730 parts of filler.

[0006] In the present invention, the cement is one or more of 32.5 ordinary Portland cement or 42.5 ordinary Portland cement.

[0007] In the present invention, the slag is one or more of S105 grade slag and S95 grade slag.

[0008] In the present invention, the fly ash is one or more of primary fly ash and secondary fly ash.

[0009] In the present invention, the tailings sand is one or more of iron tailings sand and copper tailings sand, the fineness modulus of the tailings sand is 1.0-1.5, and the particle size is less than 0.6 mm.

[0010] In the present invention, the activator is one or more of calcium oxide, sodium hydroxide and sodium silicate.

[0011] In the present invention, the water reducer is one or more of polycarboxylic acid, melamine and naphthalene-based water reducers.

[0012] In the present invention, the thickener is one or more of hydroxypropyl methylcellulose and carboxymethyl cellulose.

[0013] In the present invention, the filler is one or more of heavy calcium and stone powder, and the mesh number of the filler is 100-200 meshes.

[0014] The present invention also provides a method for preparing shield mortar with a high amount of solid waste, the steps are as follows:

[0015] Step 1: Evenly mix the activator, water reducing agent, thickener and filler to prepare shield mortar admixture;

[0016] Step 2: Evenly mix cement, slag, fly ash, tailings sand, and shield mortar admixture to obtain shield mortar powder;

[0017] Step 3: Weigh 30% of the weight of water in the shield mortar powder and add it into the mixing container;

[0018] Step 4: Slowly add the shield mortar powder into the mixing container, stirring while adding for 1-5 minutes to obtain the shield mortar slurry. After solidification, the shield mortar is obtained.

[0019] Beneficial effects: The present invention utilizes the characteristics of volcanic ash activity of slag and fly ash. Under the action of an activator, they react with water in an alkaline environment to produce a hydraulic gel structure with a certain strength. The hardened body has good performance in durability and water resistance. Slag is the waste residue discharged from the blast furnace when smelting pig iron. Its main components are silicates and aluminates composed of calcium oxide, magnesium oxide, aluminum oxide, etc. The main components of fly ash are silicon oxide and aluminum oxide. Under the action of cement and alkaline activators, a gel structure of calcium silicate and calcium sulfonate is produced. Therefore, it has good hydraulic hardness and gelling properties and can be used as a cementitious material.

[0020] At the same time, slag and fly ash have small specific surface areas, and the formed slurry has low water seepage rate, good fluidity, good construction performance, and is suitable for grouting materials. The shield mortar of the present invention utilizes more than 90% of solid waste, saves cement, not only reduces costs, but also meets engineering requirements in terms of performance. DETAILED DESCRIPTION

[0021] The invention provides a shield mortar with a high amount of solid waste, comprising the following components by weight: 30-60 parts of cement, 300-440 parts of slag, 120-200 parts of fly ash, 300-550 parts of tailings sand, and 5-10 parts of shield mortar admixture; the weight components of the shield mortar admixture are: 200-500 parts of activator, 50-100 parts of water reducer, 20-50 parts of thickener, and 350-730 parts of filler.

[0022] The cement is one or more of 32.5 ordinary Portland cement or 42.5 ordinary Portland cement.

[0023] The slag is one or more of S105 grade slag and S95 grade slag.

[0024] The fly ash is one or more of primary fly ash and secondary fly ash.

[0025] The tailings sand is one or more of iron tailings sand and copper tailings sand, the fineness modulus of the tailings sand is 1.0-1.5, and the particle size is less than 0.6 mm.

[0026] The activator is one or more of calcium oxide, sodium hydroxide and sodium silicate.

[0027] The water reducing agent is one or more of polycarboxylic acid, melamine and naphthalene series water reducing agents.

[0028] The thickener is one or more of hydroxypropyl methylcellulose and carboxymethyl cellulose.

[0029] The filler is one or more of heavy calcium and stone powder, and the mesh number of the filler is 100-200 meshes.

[0030] The present invention also provides a method for preparing shield mortar with a high amount of solid waste, the steps are as follows:

[0031] Step 1: Evenly mix the activator, water reducing agent, thickener and filler to prepare shield mortar admixture;

[0032] Step 2: Evenly mix cement, slag, fly ash, tailings sand, and shield mortar admixture to obtain shield mortar powder;

[0033] Step 3: Weigh 30% of the weight of water in the shield mortar powder and add it into the mixing container;

[0034] Step 4: Slowly add the shield mortar powder into the mixing container, stirring while adding for 1-5 minutes to obtain the shield mortar slurry. After solidification, the shield mortar is obtained.

[0035] Embodiment 1:

[0036] The shield mortar of this embodiment includes the following weight components: 30 parts of cement, 300 parts of slag, 120 parts of fly ash, 550 parts of tailings sand, and 10 parts of shield mortar admixture to prepare the shield mortar. The shield mortar admixture is composed of 200 parts of activator, 50 parts of water reducer, 20 parts of thickener, and 350 parts of filler, which are mixed evenly.

[0037] Among them, the cement is 32.5 ordinary Portland cement; the slag is a mixture of S105 and S95 grades; the fly ash is a mixture of primary fly ash and secondary fly ash; the tailings sand is a mixture of iron tailings sand and copper tailings sand, with a fineness modulus of 1.0-1.5 and a particle size less than 0.6mm; the activator is a mixture of calcium oxide, sodium hydroxide and sodium silicate; the water reducer is a mixture of polycarboxylic acid, melamine and naphthalene-based water reducers; the thickener is a mixture of hydroxypropyl methylcellulose and carboxymethyl cellulose; the filler is a mixture of 100-200 mesh heavy calcium and stone powder.

[0038] Embodiment 2:

[0039] The shield mortar of this embodiment includes the following weight components: 40 parts of cement, 350 parts of slag, 160 parts of fly ash, 450 parts of tailings sand, and 10 parts of shield mortar admixture. The above components are mixed evenly to prepare shield mortar. The shield mortar admixture is composed of: 500 parts of activator, 100 parts of water reducer, 50 parts of thickener, and 730 parts of filler, which are mixed evenly.

[0040] Among them, the cement is 32.5 ordinary Portland cement; the slag is a mixture of S105 and S95 grades; the fly ash is a mixture of primary fly ash and secondary fly ash; the tailings sand is a mixture of iron tailings sand and copper tailings sand, with a fineness modulus of 1.0-1.5 and a particle size less than 0.6mm; the activator is a mixture of calcium oxide, sodium hydroxide and sodium silicate; the water reducer is a mixture of polycarboxylic acid, melamine and naphthalene-based water reducers; the thickener is a mixture of hydroxypropyl methylcellulose and carboxymethyl cellulose; the filler is a mixture of 100-200 mesh heavy calcium and stone powder.

[0041] Embodiment 3:

[0042] The shield mortar of this embodiment includes the following weight components: 50 parts of cement, 400 parts of slag, 150 parts of fly ash, 400 parts of tailings sand, and 10 parts of shield mortar admixture. The above components are mixed evenly to prepare shield mortar. The shield mortar admixture is composed of: 300 parts of activator, 70 parts of water reducer, 30 parts of thickener, and 550 parts of filler, which are mixed evenly.

[0043] Among them, the cement is 32.5 ordinary Portland cement; the slag is a mixture of S105 and S95 grades; the fly ash is a mixture of primary fly ash and secondary fly ash; the tailings sand is a mixture of iron tailings sand and copper tailings sand, with a fineness modulus of 1.0-1.5 and a particle size less than 0.6mm; the activator is a mixture of calcium oxide, sodium hydroxide and sodium silicate; the water reducer is a mixture of polycarboxylic acid, melamine and naphthalene-based water reducers; the thickener is a mixture of hydroxypropyl methylcellulose and carboxymethyl cellulose; the filler is a mixture of 100-200 mesh heavy calcium and stone powder.

[0044] Embodiment 4:

[0045] The shield mortar of this embodiment includes the following weight components: 60 parts of cement, 440 parts of slag, 200 parts of fly ash, 300 parts of tailings sand, and 10 parts of shield mortar admixture. The above components are mixed evenly to prepare shield mortar. The shield mortar admixture is composed of 400 parts of activator, 80 parts of water reducer, 40 parts of thickener, and 650 parts of filler, which are mixed evenly.

[0046] Among them, the cement is 32.5 ordinary Portland cement; the slag is a mixture of S105 and S95 grades; the fly ash is a mixture of primary fly ash and secondary fly ash; the tailings sand is a mixture of iron tailings sand and copper tailings sand, with a fineness modulus of 1.0-1.5 and a particle size less than 0.6mm; the activator is a mixture of calcium oxide, sodium hydroxide and sodium silicate; the water reducer is a mixture of polycarboxylic acid, melamine and naphthalene-based water reducers; the thickener is a mixture of hydroxypropyl methylcellulose and carboxymethyl cellulose; the filler is a mixture of 100-200 mesh heavy calcium and stone powder.

[0047] The mortars prepared in the above four embodiments were tested according to the performance indicators of the Technical Specification for Application of Synchronous Grouting Materials for Shield Tunneling Method T / CECS 563-2018, as shown in Table 1:

[0048] Table 1:

[0049]

[0050] It can be seen from the data in Table 1 that the shield mortar of the present invention meets the product standard requirements and has the following advantages:

[0051] (1) High fluidity: The initial viscosity of the slurry is low and the fluidity is good, which makes it easier to overcome the initial shear force of the slurry during grouting construction and achieve a longer diffusion distance.

[0052] (2) High consolidation rate ensures that the slurry forms a stone body that fully fills the gaps after solidification.

[0053] (3) Good strength. The formed stone has a certain compressive strength and can bond with the surrounding matrix to form a stable structure.

[0054] (4) It can consume a large amount of solid waste, providing a new way to fully utilize solid waste, and is a good low-carbon green building material.

[0055] The present invention provides a shield mortar with a high content of solid waste and a method for preparing the same. There are many methods and ways to implement the technical solution. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention. All components not specified in this embodiment can be implemented using existing technologies.

Claims

1. A shield mortar with a high content of solid waste, characterized in that: It includes the following components by weight: 30-60 parts of cement, 300-440 parts of slag, 120-200 parts of fly ash, 300-550 parts of tailings sand, and 5-10 parts of shield mortar admixture; the weight components of the shield mortar admixture are: 200-500 parts of activator, 50-100 parts of water reducer, 20-50 parts of thickener, and 350-730 parts of filler.

2. The shield mortar with high solid waste content according to claim 1, characterized in that: The cement is one or more of 32.5 ordinary Portland cement or 42.5 ordinary Portland cement.

3. The shield mortar with high solid waste content according to claim 1, characterized in that: The slag is one or more of S105 grade slag and S95 grade slag.

4. The shield mortar with high solid waste content according to claim 1, characterized in that: The fly ash is one or more of primary fly ash and secondary fly ash.

5. The shield mortar with high solid waste content according to claim 1, characterized in that: The tailings sand is one or more of iron tailings sand and copper tailings sand, the fineness modulus of the tailings sand is 1.0-1.5, and the particle size is less than 0.6 mm.

6. The shield mortar with high solid waste content according to claim 1, characterized in that: The activator is one or more of calcium oxide, sodium hydroxide and sodium silicate.

7. The shield mortar with high solid waste content according to claim 1, characterized in that: The water reducing agent is one or more of polycarboxylic acid, melamine and naphthalene series water reducing agent.

8. The shield mortar with high solid waste content according to claim 1, characterized in that: The thickener is one or more of hydroxypropyl methylcellulose and carboxymethyl cellulose.

9. The shield mortar with high solid waste content according to claim 1, characterized in that: The filler is one or more of heavy calcium and stone powder, and the mesh number of the filler is 100-200 meshes.

10. A method for preparing shield mortar with high content of solid waste, characterized in that: Here are the steps: Step 1: Evenly mix the activator, water reducing agent, thickener and filler to prepare shield mortar admixture; Step 2: Evenly mix cement, slag, fly ash, tailings sand, and shield mortar admixture to obtain shield mortar powder; Step 3: Weigh 30% of the weight of water in the shield mortar powder and add it into the mixing container; Step 4: Slowly add the shield mortar powder into the mixing container, stirring while adding for 1-5 minutes to obtain the shield mortar slurry. After solidification, the shield mortar is obtained.

Images