CN111807737A - Water-resistant composite cementing material for roads and preparation method thereof - Google Patents
Water-resistant composite cementing material for roads and preparation method thereof Download PDFInfo
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- CN111807737A CN111807737A CN202010794626.XA CN202010794626A CN111807737A CN 111807737 A CN111807737 A CN 111807737A CN 202010794626 A CN202010794626 A CN 202010794626A CN 111807737 A CN111807737 A CN 111807737A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/28—Mixtures thereof with other inorganic cementitious materials
- C04B11/30—Mixtures thereof with other inorganic cementitious materials with hydraulic cements, e.g. Portland cements
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A water-resistant composite cementing material for roads and a preparation method thereof belong to the technical field of roadbed materials. The titanium gypsum comprises CaSO as main ingredient4·2H2O is industrial waste residue which is difficult to be applied and widely processed in a large scale, and the activity of the O is improved and impurities are removed by adopting physical and chemical methods such as calcination, water washing and the like at present, so that the performance is guaranteed; the invention provides a water-resistant composite cementing material for roads and a preparation method thereof, wherein the water-resistant composite cementing material mainly comprises 38-65 parts of titanium gypsum, 27-42 parts of slag powder, 7-19 parts of a regulator, 1-6 parts of a reinforcer and 1-4 parts of an excitant, and the preparation method comprises the steps of grinding and sieving the components, adding quantitative water and uniformly mixing. The strength is high, the strength after solidification without other fillers can reach 30MPa, the titanium gypsum is successfully applied to the field of road cementing materials, the energy consumption is effectively saved, and the storage space of a large amount of titanium gypsum is reduced.
Description
Technical Field
A water-resistant composite cementing material for roads and a preparation method thereof belong to the technical field of road materials.
Background
The titanium gypsum comprises CaSO as main ingredient4·2H2And O, adding lime or carbide slag to neutralize acid wastewater in the process of producing titanium dioxide, wherein the produced industrial waste residue is accompanied by 1.5 to 2 tons of waste residue when one ton of titanium dioxide is produced.Because of the impurities contained in the titanium gypsum and the characteristics of the titanium gypsum, a large amount of titanium gypsum is piled up at present, which occupies a large amount of land, causes resource waste and causes certain environmental pollution.
At present, researchers mostly adopt physical and chemical methods such as calcination, water washing and the like for titanium gypsum to realize the improvement of activity and the removal of impurities, so that the performance is guaranteed; however, the treatment mode increases the resource utilization cost of the titanium gypsum, so that the technology with low cost and simple process is an optimal way.
The utilization of the titanium gypsum is mainly concentrated on cement retarders, cementing materials and the like, and most of the titanium gypsum is mixed in a small amount and cannot reach the large-scale application step, so that a titanium gypsum large-scale application technology is developed, the resource utilization of solid waste is completed, the problems of land occupation, pollution and the like are reduced, a good prospect is provided for large-scale reduction of industrial solid waste, and the environmental protection and low-carbon policy advocated by the state is met. Patent CN103951298A discloses a preparation method of a titanium gypsum-based composite cementing material and an application thereof in dried sludge, wherein 20-50 parts of titanium gypsum is added in the material, but a person skilled in the art can presume that the material has low strength after solidification, the application range is limited to the sludge drying direction application and is not suitable for road use, and the low whole dosage of the cementing material results in low titanium gypsum material.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art, and provides a road water-resistant composite cementing material with large titanium gypsum dosage, high strength and low energy consumption and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a water-resistant composite cementing material for roads is characterized in that: the material mainly comprises the following materials in parts by weight:
38-65 parts of titanium gypsum, 27-42 parts of slag powder, 7-19 parts of a regulator, 1-6 parts of a reinforcer and 1-4 parts of an excitant;
the regulator is solid waste in the alkaline metal smelting industry; the reinforcer is silica fume or metakaolin, preferably silica fume; the exciting agent is alkaline sodium salt such as sodium sulfate, sodium carbonate, sodium silicate, sodium hydroxide and the like.
The action mechanism of the water-resistant composite cementing material for roads of the invention is that under the action of the regulator, an alkaline environment is provided for a cementing material matrix, the exciting agent and sulfate radicals or alkaline weak acid radicals in the titanium gypsum have multiple excitation effects, the activity of slag is greatly activated, and then hydrated calcium silicate (C-S-H), hydrated calcium aluminate (C-A-H), hydrated calcium aluminoferrite (C-A-F-H), hydrated calcium aluminosilicate (C-A-S-H), Calcium Hydroxide (CH), ettringite (AFt) and other hydrated products are generated by utilizing aluminum ions and high-content silicate radicals in a reinforcing agent provided in the slag, the gel products can tightly wrap the titanium gypsum matrix and are inserted together through AFt to form a stable whole, the silicon powder particles are extremely fine and can fill pores, meanwhile, the silicon element is provided to generate gel substances, so that the compactness of the matrix is improved, and the strength of the matrix is effectively improved.
Preferably, the material consists of the following materials in parts by weight:
39 parts of titanium gypsum;
42 parts of slag powder;
12 parts of a regulator;
4 parts of a reinforcing agent;
3 parts of an excitant;
the regulator is solid waste in the alkaline metal smelting industry;
the reinforcer is silica fume or metakaolin.
Preferably, the conditioning agent is red mud. The red mud is industrial solid waste discharged when the alumina is extracted in the aluminum industry, has large ferric oxide content, is rich in silicon-aluminum elements, is more beneficial to generating hydrated calcium aluminoferrite, hydrated calcium alumino-silicate and the like in the later period, and has better excitation effect.
Preferably, the activator is water glass. The water glass is selected as the excitant, so that the generation of expansion components in the matrix is effectively inhibited, and the guarantee is provided for later strength and water resistance.
A preparation method of a water-resistant composite cementing material for roads is characterized by comprising the following steps: the method comprises the following steps:
1) taking titanium gypsum according to a formula, drying at the temperature of 60-80 ℃, grinding, and sieving with a 75-85 mesh sieve for later use;
2) taking slag powder, drying at 100-110 ℃, grinding, sieving with a 395-405 mesh sieve, adding into the titanium gypsum in the step 1) according to the formula, and fully and uniformly mixing;
3) taking a regulator, drying at 100-120 ℃, grinding, sieving with a 320-330-mesh sieve, adding into the mixture obtained in the step 2) according to the formula, and fully and uniformly mixing;
4) taking a reinforcer with the granularity of 3000-8000 meshes, adding the reinforcer into the mixture obtained in the step 3) according to a formula, and fully and uniformly mixing;
5) and (3) dissolving the excitant in water at normal temperature, adding the excitant into the mixture obtained in the step 4) according to the proportion, and fully and uniformly mixing to obtain a finished product of the cementing material.
The water content used in the step 5) is 20-30% of the total weight of the solids used in the step 1) -5).
The water amount of the finished product of the cementing material is determined according to a standard test T0804-1994 of inorganic binder stabilizing materials for highway engineering (JTG E51-2009). When the inorganic binder stabilizing material is subjected to compaction or vibration compaction tests, corresponding points are drawn on a water content-dry density coordinate system and are connected into a smooth curve, and the water content and the dry density corresponding to the peak point of the curve are the optimal water content and the maximum dry density. Indicating the maximum dry density that can be achieved with a stable material at the optimum moisture content and optimum compaction. Wherein the water content is the water consumption of the cementing material.
Compared with the prior art, the invention has the beneficial effects that: the invention fully utilizes the chemical characteristics of the solid waste material, effectively activates the active ingredients, and realizes the guarantee of the strength and the water resistance, thereby applying the cementing material to a large number of pavement base layers; the solid waste accounts for more than 96 percent, and the method does not need the pretreatment steps such as calcination, water washing and the like, has no secondary pollution and high resource utilization rate; compared with the traditional cementing material, the invention can lead the strength of the final cementing material to reach more than 30MPa after solidification without the pretreatment processes of calcining, washing, aging and the like and without adding fillers or aggregates such as cement and the like in the application, thereby meeting the requirements of the cementing material of the pavement base, effectively reducing energy consumption and cost and being convenient for application and popularization.
Detailed Description
Is a preferred embodiment of the present invention, and the present invention will be further described with reference to the following examples.
Example 1
A water-resistant composite cementing material for roads and a preparation method thereof.
The formula is as follows: 390g of titanium gypsum; 420g of slag powder; 120g of red mud; 40g of silica fume; 30g of water glass; 250g of water.
The preparation method comprises the following steps:
1) drying titanium gypsum at 70 ℃, grinding, and sieving with a 80-mesh sieve for later use;
2) taking slag powder, drying at 105 ℃, grinding, sieving with a 400-mesh sieve, adding into the titanium gypsum in the step 1) according to a formula, and fully and uniformly mixing;
3) drying the red mud at 110 ℃, grinding, sieving with a 325-mesh sieve, adding the red mud into the mixture obtained in the step 2) according to the formula, and fully and uniformly mixing;
4) adding silica fume with the granularity of 3000-8000 meshes into the mixture obtained in the step 3) according to a formula, and fully and uniformly mixing;
5) and (3) dissolving water glass in water at normal temperature, adding the water glass into the mixture obtained in the step 4) according to the formula, and fully and uniformly mixing to obtain a finished product of the cementing material.
Example 2
A water-resistant composite cementing material for roads and a preparation method thereof.
The formula is as follows: 410g of titanium gypsum; 420g of slag powder; 100g of red mud; 20g of metakaolin; 20g of sodium sulfate; 247g of water.
The preparation procedure was the same as in example 1.
Example 3
A water-resistant composite cementing material for roads and a preparation method thereof.
The formula is as follows: 420g of titanium gypsum; 440g of slag powder; 100g of red mud; 20g of metakaolin; 20g of sodium sulfate; 253g of water.
The preparation procedure was the same as in example 1.
Example 4
A water-resistant composite cementing material for roads and a preparation method thereof.
The formula is as follows: 650g of titanium gypsum; 420g of slag powder; 190g of red mud; 60g of metakaolin; 40g of sodium sulfate; 345.5g of water.
The preparation procedure was the same as in example 1.
Example 5
A water-resistant composite cementing material for roads and a preparation method thereof.
The formula is as follows: 400g of titanium gypsum; 270g of slag powder; 80g of red mud; 15g of metakaolin; 15g of sodium sulfate; 196.6g of water.
The preparation procedure was the same as in example 1.
Comparative example 1
A water-resistant composite cementing material for roads and a preparation method thereof.
The formula is as follows: 390g of titanium gypsum; 420g of slag powder; 120g of red mud; 0g of silica fume; 30g of water glass; 240g of water.
The preparation procedure was the same as in example 1.
Comparative example 2
A water-resistant composite cementing material for roads and a preparation method thereof.
The formula is as follows: 350g of titanium gypsum; 460g of slag powder; 120g of red mud; 40g of silica fume; 30g of water glass; 250g of water.
The preparation procedure was the same as in example 1.
Comparative example 3
A water-resistant composite cementing material for roads and a preparation method thereof.
The formula is as follows: 400g of titanium gypsum; 470g of slag powder; 60g of red mud; 40g of silica fume; 30g of water glass; 250g of water.
The preparation procedure was the same as in example 1.
Performance testing
The titanium gypsum-based composite cementing material prepared by the formula and the method is subjected to unconfined compressive strength test in JTG E51-2009 road engineering inorganic binder stable material test regulation, wherein 7d unconfined compressive strength is the unconfined compressive strength of the cementing material after being cured and solidified for 7 days; the 28d unconfined compressive strength is the unconfined compressive strength of the pour point depressing material after curing and solidification for 28 days.
The results of the performance tests of the examples are shown in tables 1 and 2, wherein the results of the 7d unconfined compressive strength and softening coefficient test are shown in table 1, and the results of the 28d unconfined compressive strength and softening coefficient test are shown in table 2.
Table 17 d test results
Table 228 d test results
According to the test results in tables 1 and 2, it can be seen that, under the condition that no reinforcing agent is added in the comparative example 1, the compressive strength and the softening coefficient are greatly influenced, and according to the comparison of the test results in the comparative examples 2 and 3 and the test result in the example 1, the red mud not only has the filling effect, but also has the effect of providing an alkaline environment and excitation of silicon and aluminum elements for other materials; besides the filling effect, rich sulfate radicals in the titanium gypsum play a role in excitation, the activity of slag is improved, and the strength of the gelled material after solidification is enhanced, so that the strength of the gelled material after curing and solidification can be effectively improved by preparing the components according to the addition amount of the components in the formula range, the titanium gypsum is suitable for the road gelled material, the application direction of the titanium gypsum is greatly widened, and the energy and the space are saved.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (5)
1. A water-resistant composite cementing material for roads is characterized in that: the material consists of the following materials in parts by weight:
38-65 parts of titanium gypsum;
27-42 parts of slag powder;
7-19 parts of a regulator;
1-6 parts of a reinforcer;
1-4 parts of an excitant;
the regulator is solid waste in the alkaline metal smelting industry;
the reinforcer is silica fume or metakaolin.
2. The water-resistant composite cementitious material for roads of claim 1, characterized in that: the material consists of the following materials in parts by weight:
39 parts of titanium gypsum;
42 parts of slag powder;
12 parts of a regulator;
4 parts of a reinforcing agent;
3 parts of an excitant;
the regulator is solid waste in the alkaline metal smelting industry;
the reinforcer is silica fume or metakaolin.
3. The water-resistant composite cementitious material for roads of claim 1, characterized in that: the regulator is red mud.
4. The water-resistant composite cementitious material for roads of claim 2, characterized in that: the excitant is water glass.
5. A preparation method of a water-resistant composite cementing material for roads is characterized by comprising the following steps: the method comprises the following steps:
1) taking titanium gypsum according to a formula, drying at the temperature of 60-80 ℃, grinding, and sieving with a 75-85 mesh sieve for later use;
2) taking slag powder, drying at 100-110 ℃, grinding, sieving with a 395-405 mesh sieve, adding into the titanium gypsum in the step 1) according to the formula, and fully and uniformly mixing;
3) taking a regulator, drying at 100-120 ℃, grinding, sieving with a 320-330-mesh sieve, adding into the mixture obtained in the step 2) according to the formula, and fully and uniformly mixing;
4) taking a reinforcer with the granularity of 3000-8000 meshes, adding the reinforcer into the mixture obtained in the step 3) according to a formula, and fully and uniformly mixing;
5) and (3) dissolving the excitant in water at normal temperature, adding the excitant into the mixture obtained in the step 4) according to the proportion, and fully and uniformly mixing to obtain a finished product of the cementing material.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114656237A (en) * | 2022-03-11 | 2022-06-24 | 山东大学 | Titanium gypsum-based roadbed filler and preparation method and application thereof |
| CN114933462A (en) * | 2021-11-08 | 2022-08-23 | 东营天识环保科技有限公司 | Method for manufacturing roadbed base layer and subbase layer materials by utilizing titanium gypsum |
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| CN114933462A (en) * | 2021-11-08 | 2022-08-23 | 东营天识环保科技有限公司 | Method for manufacturing roadbed base layer and subbase layer materials by utilizing titanium gypsum |
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Application publication date: 20201023 |