Titanium gypsum composite cementing material, preparation method and prepared sleeve grouting material

Abstract

The invention discloses a titanium gypsum composite cementing material, a preparation method and a prepared sleeve grouting material, and relates to the technical field of industrial waste utilization. The titanium gypsum composite cementing material is prepared from the following components in percentage by mass: 59.5 percent to 66.5 percent of Portland cement, 25.5 percent to 28.5 percent of sulphoaluminate cement and 5 percent to 15 percent of titanium gypsum powder, the titanium gypsum powder is obtained by drying, crushing and grinding original-state titanium gypsum to pass through a 200-mesh sieve. The titanium gypsum and the cement are combined to form a novel cementing material, the strength of a binary cement cementing system is obviously improved under the addition of the titanium gypsum, meanwhile, the titanium gypsum industrial waste is reasonably utilized, the waste is turned into wealth, the cost is saved for the treatment of the titanium gypsum, and the produced grouting material is high in compressive strength and good in comprehensive performance. The problem of pollution caused by stacking of titanium gypsum is solved, economic benefits are brought while the environment is protected, and the application prospect is wide.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial waste utilization, and particularly to a titanium gypsum composite cementitious material, a preparation method, and a sleeve grouting material obtained therefrom. Background Art

[0002] Titanium gypsum is an industrial waste generated during the production of titanium dioxide by the sulfuric acid process. It is produced by neutralizing waste acid and acidic wastewater with calcium-based alkaline substances such as limestone, lime, and carbide slag. Its main component is calcium sulfate dihydrate (CaSO4·2H2O). Usually, 4-5t of titanium gypsum by-products are generated for every 1t of titanium dioxide produced. Its large amount of discharge not only occupies available land and causes environmental pollution, but also brings a huge economic burden to titanium dioxide enterprises.

[0003] A titanium gypsum waste residue composite cementitious material and its application disclosed in Chinese Patent 201910658035.7. The composite cementitious material comprises the following raw materials in parts by weight: titanium gypsum: 20-80 parts; alkaline catalyst: 1-70 parts; chemical additive: 0.1-10 parts; water reducing agent: 0.1-5 parts. The 3d compressive strength of the cementitious material obtained after stirring, forming, and curing is 37.4MPa, and the 28d compressive strength is 47.9MPa. Such strength values limit the application of the above cementitious material in many fields, and the performance test indexes of the cementitious material in this invention patent are relatively single and cannot well characterize its performance.

[0004] Sleeve grouting material is an important material for steel bar connection in prefabricated buildings. If titanium gypsum can be used to prepare sleeve grouting material for steel bar connection, it can not only realize the secondary utilization of waste, reduce pollution, but also solve the current situation of shortage and high price of desulfurized gypsum, reduce the cement consumption in the grouting material, and lower the production cost, having certain economic and social benefits. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies of the above background art, and provide a titanium gypsum composite cementitious material, a preparation method, and a sleeve grouting material obtained therefrom, which can not only realize the secondary utilization of industrial waste titanium gypsum, reduce pollution, but also reduce the cement consumption in the grouting material and lower the production cost.

[0006] One of the purposes of the present invention is to provide a titanium gypsum composite cementitious material, comprising the following components in mass percentage:

[0007] Portland cement 59.5% - 66.5%, sulfoaluminate cement 25.5% - 28.5%, titanium gypsum 5% - 15%; the titanium gypsum powder is obtained by drying, crushing, and grinding the original titanium gypsum through a 200-mesh sieve. The sum of the mass percentages of Portland cement, sulfoaluminate cement, and titanium gypsum powder is 100%.

[0008] Preferably, the silicate cement is P·I 52.5 grade silicate cement, and the sulphoaluminate cement is 42.5 grade sulphoaluminate cement.

[0009] Preferably, the following components are included in percentage by mass: 66.5% of silicate cement, 28.5% of sulphoaluminate cement, and 5% of titanium gypsum.

[0010] Preferably, the mass ratio of silicate cement to sulphoaluminate cement is 7:3.

[0011] The second object of the present invention is to provide a method for preparing a titanium gypsum composite gelling material, comprising the following steps:

[0012] The recovered original titanium gypsum is dried, crushed, ground, and sieved through a 200-mesh sieve to obtain titanium gypsum powder;

[0013] The silicate cement, sulphoaluminate cement and titanium gypsum powder are mixed to obtain the titanium gypsum composite cementitious material.

[0014] Preferably, the mass percentage of each component in the titanium gypsum composite cementitious material is: 59.5% to 66.5% of silicate cement, 25.5% to 28.5% of sulphoaluminate cement, and 5% to 15% of titanium gypsum.

[0015] Preferably, the drying comprises drying at a temperature of 100-105° C. to a constant weight, and the crushing comprises crushing to a particle size of no more than 1 cm.

[0016] The third object of the present invention is to provide a sleeve grouting material made of titanium gypsum composite gelling material, comprising the following raw materials in parts by mass:

[0017] 100 parts of titanium gypsum composite cementitious material,

[0018] 110-120 parts of sand,

[0019]

[0020] Preferably, the sand is quartz sand of three particle sizes of 16-26 mesh, 26-40 mesh, and 40-70 mesh, which are compounded in a mass ratio of 1:2:2.

[0021] Preferably, the initial fluidity of the sleeve grouting material is ≥300mm, the 30min fluidity is ≥260mm; the 1d compressive strength is ≥35Mpa, and the 3d compressive strength is ≥60Mpa.

[0022] The fourth object of the present invention is to provide a method for preparing a sleeve grouting material made of a titanium gypsum composite gelling material, comprising the following steps:

[0023] Dry mix the titanium gypsum composite cementitious material, sand, water reducer, and defoamer to obtain a powder, and then pour the water completely within 10 s and stir to obtain sleeve grouting material.

[0024] Preferably, it includes the following steps: Add the titanium gypsum composite cementitious material, sand, water reducer, and defoamer into a planetary cement mortar mixer, and dry mix for 1 min by slow stirring to obtain a powder.

[0025] Then pour the water completely within 10 s and stir. The stirring process includes: slow stirring for 1 min, then fast stirring for 30 s, stopping for 1.5 min, and then fast stirring for 1 min to obtain sleeve grouting material.

[0026] The slow stirring is at a revolution speed of 60 - 64 r / min and a rotation speed of 138 - 142 r / min, and the fast stirring is at a revolution speed of 122 - 128 r / min and a rotation speed of 282 - 288 r / min.

[0027] The titanium gypsum powder used in the present invention, through component analysis, has the following mass contents of each component:

[0028] 35% - 45% of SO3, 30% - 40% of CaO, 8 - 12% of Fe2O3, 1 - 5.5% of TiO2, 2 - 6% of SiO2, 1 - 4% of MgO, 0.5 - 2% of Al2O3, 0.5 - 1% of Na2O, 0.1 - 1% of MnO, and inevitable impurities.

[0029] The mass contents of each component of the titanium gypsum powder specifically used in the present invention are:

[0030] 42.13% of SO3, 34.66% of CaO, 10.81% of Fe2O3, 3.97% of TiO2, 3.30% of SiO2, 2.14% of MgO, 1.20% of Al2O3, 0.81% of Na2O, 0.48% of MnO, and the rest are inevitable impurities.

[0031] The beneficial effects of the present invention are as follows:

[0032] 1. Compared with the prior art, the present invention provides a new use of titanium gypsum, combines titanium gypsum and cement to form a new type of Portland cement - calcium sulfoaluminate cement - titanium gypsum ternary composite cementitious material. The strength of the binary cementitious system increases significantly with the addition of titanium gypsum. At the same time, it reasonably utilizes the titanium gypsum industrial waste, turning waste into treasure, saving costs for the treatment of titanium gypsum. The produced grouting material has high compressive strength, solves the pollution problem caused by the stacking of titanium gypsum, brings economic benefits while protecting the environment, and has broad application prospects.

[0033] 2. The main mineral composition and chemical composition of titanium gypsum are similar to those of desulfurized gypsum, which has a certain setting retardation effect and can, to a certain extent, improve the mechanical strength of grouting material, meeting the characteristic requirements of good fluidity of grouting material (initial fluidity of sleeve grouting material ≥ 300 mm, fluidity at 30 min ≥ 260 mm) and high early strength (compressive strength at 1 d ≥ 35 Mpa, compressive strength at 3 d ≥ 60 Mpa).

[0034] 3. When preparing the Portland cement - sulphoaluminate cement - titanium gypsum ternary composite cementitious material of the present invention, the titanium gypsum powder is obtained by drying, crushing, and grinding the as - received titanium gypsum through a 200 - mesh sieve. The purpose is to ensure that the appropriate fineness of titanium gypsum can fully react with the aluminate minerals during the cement hydration process, generate sufficient ettringite, fill the pores of the cement stone, make the structure of the cement stone more dense, and thus improve the strength of the grouting material.

[0035] 4. When preparing the sleeve grouting material in the present invention, after pouring water, stir slowly for 1 min, then stir quickly for 30 s, stop for 1.5 min, and then stir quickly for 1 min. The purpose is to mix the grouting material evenly and make the water - reducing agent play a role, ensuring that the grouting material has good fluidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the appearance of the as - received titanium gypsum, the appearance of the dried and ground titanium gypsum, and the scanning electron microscope of titanium gypsum related to the present invention.

[0037] Figure 2 It is a schematic block diagram of the preparation process of the sleeve grouting material related to the present invention.

[0038] Figure 3 It is a test chart of fluidity in the performance test of the present invention.

[0039] Figure 4 It is a test chart of compressive strength in the performance test of the present invention.

[0040] Figure 5 It is a schematic diagram of the rheological curve in the performance test of the present invention.

[0041] Figure 6 It is a schematic diagram of plastic viscosity and yield stress in the performance test of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0042] The concept of the present invention and the resulting technical effects will be clearly and completely described below in conjunction with embodiments to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention. For those conditions not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. Reagents or instruments not indicated by the manufacturer can be obtained as conventional products through commercial purchase.

[0043] The present invention provides a titanium gypsum composite cementitious material, namely a ternary composite cementitious material of portland cement - calcium sulfoaluminate cement - titanium gypsum.

[0044] The preparation process thereof is as follows:

[0045] (1) As Figure 1 shown, the retrieved original titanium gypsum is dried, where the drying temperature is 105°C until constant weight. The dried titanium gypsum is crushed to a particle size not greater than 1 cm and impurities therein are removed. The crushed titanium gypsum is placed in a ball mill for ball milling. The titanium gypsum powder after ball milling is sieved through a 200-mesh sieve to obtain titanium gypsum powder.

[0046] (2) The sieved titanium gypsum powder is mixed with P·I 52.5 portland cement and 42.5 calcium sulfoaluminate cement in proportion to obtain the ternary composite cementitious material of portland cement - calcium sulfoaluminate cement - titanium gypsum. Among them, the content of each component is 59.5% - 66.5% of portland cement, 25.5% - 28.5% of calcium sulfoaluminate cement, and 5% - 15% of titanium gypsum powder.

[0047] The appearance of the original titanium gypsum, the appearance of the dried and ground titanium gypsum, and the scanning electron microscope schematic diagram of the titanium gypsum are as Figure 1 shown.

[0048] The requirements for the mass content of each component of the titanium gypsum powder used in the present invention are:

[0049] 35% - 45% of SO3, 30% - 40% of CaO, 8 - 12% of Fe2O3, 1 - 5.5% of TiO2, 2 - 6% of SiO2, 1 - 4% of MgO, 0.5 - 2% of Al2O3, 0.5 - 1% of Na2O, 0.1 - 1% of MnO, and inevitable impurities.

[0050] The mass content of each component of the titanium gypsum powder specifically used in the present invention is:

[0051] 42.13% SO3, 34.66% CaO, 10.81% Fe2O3, 3.97% TiO2, 3.30% SiO2, 2.14% MgO, 1.20% Al2O3, 0.81% Na2O, 0.48% MnO, and the rest are inevitable impurities.

[0052] As Figure 2 shown, the sleeve grouting material is prepared by using the above titanium gypsum composite cementitious material, and the preparation process is as follows:

[0053] Put sand and the ternary composite cementitious material of portland cement - calcium sulfoaluminate cement - titanium gypsum into a planetary mortar mixer, and at the same time add a water reducer and an antifoaming agent, and mix dry slowly for 1 min (revolution speed 60 - 64 r / min, rotation speed 138 - 142 r / min) to make the powder materials evenly mixed; pour water completely into the planetary mortar mixer within 10 s, mix slowly for 1 min and then mix quickly for 30 s (revolution speed 122 - 128 r / min, rotation speed 282 - 288 r / min), stop for 1.5 min, and then mix quickly for 1 min to obtain mortar.

[0054] The sand used above is obtained by mixing quartz sand with three particle sizes of 16 - 26 mesh, 26 - 40 mesh, and 40 - 70 mesh, and the mixing mass ratio is 1:2:2. In the sleeve grouting material, the ternary composite cementitious material, sand, water reducer and antifoaming agent, and water are as follows by mass fraction:

[0055] 100 parts of the ternary composite cementitious material of portland cement - calcium sulfoaluminate cement - titanium gypsum (i.e., titanium gypsum composite cementitious material), 110 - 120 parts of sand, 1 - 1.5 parts of water reducer, 0.2 - 0.3 parts of antifoaming agent, and 23 - 24 parts of water.

[0056] The present invention will be further described in detail below through specific embodiments.

[0057] Example 1

[0058] This example provides a titanium gypsum composite cementitious material, that is, a ternary composite cementitious material of portland cement - calcium sulfoaluminate cement - titanium gypsum,

[0059] and its preparation process is as follows:

[0060] (1) Dry the retrieved original titanium gypsum, where the drying temperature is 105 °C and dry it to constant weight. Crush the dried titanium gypsum to a particle size not greater than 1 cm and remove the impurities therein. Place the crushed titanium gypsum in a ball mill for ball milling, and pass the ball - milled titanium gypsum powder through a 200 - mesh sieve to obtain titanium gypsum powder.

[0061] (2) Mix 568.6 g of P·I 52.5 grade portland cement, 243.7 g of 42.5 grade sulfoaluminate cement with 42.7 g of the titanium gypsum treated in step (1) to obtain a ternary composite cementitious material of portland cement - sulfoaluminate cement - titanium gypsum. Among them, the content of the ternary composite cementitious material is 66.5% of portland cement, 28.5% of sulfoaluminate cement, and 5% of titanium gypsum powder.

[0062] Prepare sleeve grouting material using the above titanium gypsum composite cementitious material, and its preparation process is as follows:

[0063] Add 950 g of sand, the portland cement - sulfoaluminate cement - titanium gypsum ternary composite cementitious material prepared in step (2), 8.55 g of polycarboxylate water reducer, and 1.71 g of defoamer into a planetary cement mortar mixer, and stir slowly and dry mix for 1 min (in this example, the slow stirring is a revolution speed of 60 r / min and a rotation speed of 140 r / min) to make the powder evenly mixed; pour 196.6 g of water completely into the slow stirring within 10 s and stir for another 1 min, then stir quickly for 30 s (in this example, the quick stirring is a revolution speed of 125 r / min and a rotation speed of 285 r / min), stop for 1.5 min, and then stir quickly for 1 min to obtain mortar. Among them, the mass ratio of the ternary composite cementitious material, sand, water reducer, defoamer, and water is 100:111.1:1:0.2:23. Place the mortar in a test mold of 40×40×160 mm to obtain mortar specimen 1.

[0064] Example 2

[0065] This example provides a titanium gypsum composite cementitious material, namely a ternary composite cementitious material of portland cement - sulfoaluminate cement - titanium gypsum,

[0066] and its preparation process is as follows:

[0067] (1) Dry the retrieved as - received titanium gypsum, where the drying temperature is 105 °C and dry it to constant weight. Crush the dried titanium gypsum to a particle size not greater than 1 cm and remove the impurities therein. Place the crushed titanium gypsum in a ball mill for ball milling, and sieve the ball - milled titanium gypsum powder through a 200 - mesh sieve to obtain titanium gypsum powder.

[0068] (2) Mix 538.7 g of P·I 52.5 grade portland cement, 230.8 g of 42.5 grade sulfoaluminate cement with 85.5 g of the titanium gypsum treated in step (1) to obtain a ternary composite cementitious material of portland cement - sulfoaluminate cement - titanium gypsum. Among them, the content of the ternary composite cementitious material is 63% of portland cement, 27% of sulfoaluminate cement, and 10% of titanium gypsum powder.

[0069] Prepare sleeve grouting material using the above titanium gypsum composite cementitious material, and its preparation process is as follows:

[0070] Put 950 g of sand, the portland cement - calcium sulfoaluminate cement - titanium gypsum ternary composite cementitious material prepared in step (2), 8.55 g of polycarboxylate water reducer, and 1.71 g of defoamer into a planetary cement mortar mixer, and dry - mix slowly for 1 min (in this example, the slow mixing is at a revolution speed of 60 r / min and a rotation speed of 140 r / min) to evenly mix the powder materials; pour 196.6 g of water completely within 10 s, slow - mix for 1 min, then fast - mix for 30 s (in this example, the fast mixing is at a revolution speed of 125 r / min and a rotation speed of 285 r / min), stop for 1.5 min, and then fast - mix for 1 min to obtain the mortar. The mass ratio of the ternary composite cementitious material, sand, water reducer, defoamer, and water is 100:111.1:1:0.2:23. Place the mortar in a test mold of 40×40×160 mm to obtain mortar specimen 2.

[0071] Example 3

[0072] This example provides a titanium gypsum composite cementitious material, namely a portland cement - calcium sulfoaluminate cement - titanium gypsum ternary composite cementitious material.

[0073] The preparation process is as follows:

[0074] (1) Dry the retrieved original titanium gypsum at a drying temperature of 105 °C until it reaches a constant weight. Crush the dried titanium gypsum to a particle size not greater than 1 cm and remove the impurities therein. Place the crushed titanium gypsum in a ball mill for ball - milling. Pass the ball - milled titanium gypsum powder through a 200 - mesh sieve to obtain titanium gypsum powder.

[0075] (2) Mix 508.7 g of P·I 52.5 - grade portland cement, 218.0 g of 42.5 - grade calcium sulfoaluminate cement with 128.3 g of the titanium gypsum treated in step (1) to obtain a portland cement - calcium sulfoaluminate cement - titanium gypsum ternary composite cementitious material. The content of the ternary composite cementitious material is 59.5% portland cement, 25.5% calcium sulfoaluminate cement, and 15% titanium gypsum powder.

[0076] Use the above - mentioned titanium gypsum composite cementitious material to prepare sleeve grouting material. The preparation process is as follows:

[0077] Add 950 g of sand, the Portland cement - calcium sulfoaluminate cement - titanium gypsum ternary composite cementitious material prepared in step (2), 8.55 g of polycarboxylate superplasticizer, and 1.71 g of defoamer into a planetary cement mortar mixer, and dry - mix slowly for 1 min (in this example, the slow mixing is at a revolution speed of 60 r / min and a rotation speed of 140 r / min) to make the powder materials evenly mixed; pour 196.6 g of water completely within 10 s, slow - mix for 1 min and then fast - mix for 30 s (in this example, the fast mixing is at a revolution speed of 125 r / min and a rotation speed of 285 r / min), stop for 1.5 min, and then fast - mix for 1 min to obtain the mortar, where the mass ratio of the ternary composite cementitious material, sand, superplasticizer, defoamer, and water is 100:111.1:1:0.2:23. Place the mortar in a mold of 40×40×160 mm to obtain mortar specimen 3.

[0078] Comparative example

[0079] This comparative example relates to the preparation of a Portland cement - calcium sulfoaluminate cement binary cementitious material mortar, and its preparation process is as follows:

[0080] Put 598.5 g of P·I 52.5 grade Portland cement, 256.5 g of 42.5 grade calcium sulfoaluminate cement, 950 g of quartz sand, 8.55 g of polycarboxylate superplasticizer, and 1.71 g of defoamer into a planetary cement mortar mixer for stirring, dry - mix slowly for 1 min to make the powder materials evenly mixed; pour 196.6 g of water completely within 10 s, slow - mix for 1 min and then fast - mix for 30 s, stop for 1.5 min, and then fast - mix for 1 min to obtain the mortar (the slow - mixing and fast - mixing rotation speeds in this comparative example are the same as those in Example 1). Place the mortar in a mold of 40×40×160 mm to obtain mortar comparative specimen 1.

[0081] Performance testing

[0082] Do not incorporate quartz sand in the preparation of the sleeve grout in Examples 1 - 3 and the comparative example to obtain neat - paste specimens 1, 2, 3, and neat - paste comparative specimen 1.

[0083] The performance detection involves the fluidity, compressive strength performance testing and analysis of mortar specimens 1, 2, 3, and mortar comparative specimen 1, as well as the rheological property testing and analysis of neat - paste specimens 1, 2, 3, and neat - paste comparative specimen 1.

[0084] Conduct fluidity tests on mortar specimens 1, 2, 3, and mortar comparative specimen 1 respectively, and the results are as Figure 3As shown: The initial fluidity and 30-minute fluidity of the grout incorporated with titanium gypsum both show relatively ideal levels. Among them, the initial fluidity of the grout decreases with the increase in the incorporation amount of titanium gypsum, and the initial fluidity is 341 mm when 5% is incorporated. At the same time, the 30-minute fluidity test results also show the same trend. It can be seen from the SEM image of titanium gypsum that titanium gypsum mostly appears in sheet-like and long-strip shapes, and at the same time contains some flocculent fine particles and aggregates of impurities such as Fe(OH)3. The irregular accumulation of these mineral impurities will form many voids of different sizes, which are more suitable for absorbing and storing external moisture, and have a certain impact on the fluidity performance of the grout.

[0085] The 1-day, 3-day, and 28-day compressive strengths and bleeding rates of mortar specimens 1, 2, 3, and comparative specimen 1 were tested respectively, and the results are as shown in Table 1 below and Figure 4 as shown:

[0086] Table 1 Test of Compressive Strength and Bleeding Rate

[0087]

[0088]

[0089] It can be seen from the above table that when 5% titanium gypsum was added to mortar specimen 1, its compressive strength was significantly improved, especially the effect on the later-age development of the mortar specimen was more obvious. Its 1-day, 3-day, and 28-day compressive strengths were 62.6 MPa, 76.4 MPa, and 88.9 MPa respectively, meeting the requirements of early strength, high strength, and no bleeding in relevant specifications.

[0090] The rheological properties of neat cement specimens 1, 2, 3, and neat cement comparative specimen 1 were tested using a DHR 2 rheometer produced by TA Company. The rheological process test is mainly divided into two stages: the pre-shearing stage and the shearing stage, and the results are as Figure 5 shown: It can be seen from the shear stress-shear rate rheological curves of the neat cement of the grout with different incorporation amounts of titanium gypsum that the overall trends of the four rheological curves are the same. As the shear rate increases, the shear stress gradually increases. Through fitting, it is found that the neat cement paste of the grout incorporated with titanium gypsum conforms to the Herschel-Bulkley model, and the incorporation of titanium gypsum does not change the rheological type of the paste. As Figure 6 shown, as the incorporation amount of titanium gypsum increases, the yield stress and plastic viscosity also increase. To ensure good fluidity of the paste and no segregation phenomenon, considering the mechanical strength, the optimal incorporation amount of titanium gypsum is 5%. At this time, the yield stress of the paste is 1.35436 Pa, which is 8% higher than that when the incorporation amount is 0%; at this time, the plastic viscosity of the paste is 0.0432 Pa·s, which is 17.4% higher than that when the incorporation amount is 0%.

[0091] Generally speaking, the addition of 5% titanium gypsum slightly reduces the fluidity of the grout mortar. However, compared with the specification requirements of an initial fluidity ≥ 300 mm and a 30-minute fluidity ≥ 260 mm, its fluidity is still at a relatively high level. The compressive strength of the grout is significantly improved, providing assurance for structural safety. The fluidity and pumpability of the grout have become an important indicator for evaluating the quality of the grout, which is reflected by the rheological properties of the slurry. When the yield stress of the slurry is too low, segregation of the slurry is likely to occur, and too high a plastic viscosity will hinder the flow of the slurry. The addition of 5% titanium gypsum appropriately increases the yield stress and plastic viscosity of the grout, so that the grout slurry neither undergoes segregation nor is hindered by too high a plastic viscosity, resulting in excellent comprehensive performance.

Claims

1. A titanium gypsum composite cementitious material, characterized in that, It comprises the following components by mass percentage: Portland cement 59.5% - 66.5%, sulphoaluminate cement 25.5% - 28.5%, titanium gypsum powder 5% - 15%; the titanium gypsum powder is obtained by drying, crushing and grinding the original titanium gypsum until it passes through a 200-mesh sieve.

2. The titanium gypsum composite cementitious material according to claim 1, characterized in that, The Portland cement is P·I 52.5 grade Portland cement, and the sulphoaluminate cement is 42.5 grade sulphoaluminate cement.

3. The titanium gypsum composite cementitious material according to claim 1, characterized in that, It comprises the following components by mass percentage: Portland cement 66.5%, sulphoaluminate cement 28.5%, titanium gypsum powder 5%.

4. A preparation method of the titanium gypsum composite cementitious material according to any one of claims 1 to 3, characterized in that, It comprises the following steps: Dry the retrieved original titanium gypsum, then crush, grind and sieve it through a 200-mesh sieve to obtain titanium gypsum powder; Mix the Portland cement, sulphoaluminate cement and titanium gypsum powder to obtain a titanium gypsum composite cementitious material.

5. The preparation method of the titanium gypsum composite cementitious material according to claim 4, characterized in that, The drying includes drying to constant weight at a temperature of 100 - 105°C, and the crushing includes crushing to a particle size not greater than 1 cm.

6. A sleeve grouting material prepared from the titanium gypsum composite cementitious material according to any one of claims 1 to 3, characterized in that, It comprises the following raw materials by mass parts:

7. The sleeve grouting material prepared from the titanium gypsum composite cementitious material according to claim 6, wherein The sand is obtained by compounding quartz sands with three particle sizes of 16 - 26 mesh, 26 - 40 mesh and 40 - 70 mesh according to a mass ratio of 1:2:

2.

8. The sleeve grouting material prepared from the titanium gypsum composite cementitious material according to claim 6, wherein The initial fluidity of the sleeve grouting material ≥ 300 mm, the fluidity at 30 min ≥ 260 mm; the compressive strength at 1 d ≥ 35 Mpa, and the compressive strength at 3 d ≥ 60 Mpa.

9. A preparation method of a sleeve grouting material made of the titanium gypsum composite cementitious material as described in claim 6, characterized in that, It comprises the following steps: Dry mix the titanium gypsum composite cementitious material, sand, water reducer and defoamer to obtain a powder, and then pour the water completely within 10 s and stir to obtain the sleeve grouting material.

10. The preparation method of the sleeve grouting material made of the titanium gypsum composite cementitious material according to claim 9, characterized in that, It comprises the following steps: Add the titanium gypsum composite cementitious material, sand, water reducer and defoamer into a planetary cement mortar mixer, and dry mix for 1 min at a slow speed to obtain a powder; Then pour the water completely into the planetary cement mortar mixer within 10 s and stir. The stirring process includes: slow stirring for 1 min, then fast stirring for 30 s, stopping for 1.5 min and then fast stirring for 1 min to obtain the sleeve grouting material; The slow stirring is at a revolution speed of 60 - 64 r / min and a rotation speed of 138 - 142 r / min, and the fast stirring is at a revolution speed of 122 - 128 r / min and a rotation speed of 282 - 288 r / min.

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