Ultra-high toughness engineering material mixture and preparation method thereof

Abstract

The present invention discloses an ultra-high-toughness engineering material mixture and a preparation method thereof. The mixture comprises the following raw materials, calculated by dry weight percentage: 40% to 50% high-titanium heavy slag crushed stone, 25% to 35% high-titanium heavy slag sand, 15% to 20% Portland cement clinker powder, 3% to 4% lithium slag powder, 3.5% to 4.0% silica fume, and 1.5% to 2.0% chopped fiber. The ultra-high-toughness engineering material mixture of the present invention has particles all smaller than 10 mm, with particles of 5 mm to 10 mm accounting for 20% to 25%, particles smaller than 0.045 mm accounting for 30% to 40%, and the remaining particles larger than 0.045 mm and smaller than 5 mm. The mixture has a uniformity greater than 90%. After the ultra-high toughness engineering material mixture prepared by the present invention is mixed with 6% to 8% water by mass of the mixture, the slurry formed has a slump of 250 to 280 mm and an expansion greater than 600 to 650 mm. The hardened body after curing for 28 days has a compressive strength of 120 to 140 MPa and a flexural strength of 15 to 20 MPa.

Description

Technical Field

[0001] The present invention relates to the technical field of fiber-reinforced cement-based composite materials, and in particular to an ultra-high toughness engineering material mixture and a preparation method thereof. Background Art

[0002] Ultra-high-toughness engineering materials are a type of fiber-reinforced cementitious composite material and a form of ultra-high-performance concrete. Compared to conventional concrete, they possess higher load-bearing capacity, toughness, and durability. Their deformation behavior is more similar to that of steel bars, making them considered the most promising engineering materials for future high-performance, long-life structures and major infrastructure. The design of ultra-high-toughness engineering materials is based on the principle of closest particle packing and fiber reinforcement. The gaps between particles and the interstitial space are bonded and filled with a cementitious paste, while the fibers provide composite reinforcement, stress transfer, and bridging.

[0003] Traditional methods for preparing ultra-high-toughness engineering materials primarily utilize a finely formulated, continuously graded quartz sand and quartz powder as the supporting skeleton phase, high-volume cement, high-fineness fly ash, and silica fume as the cementing and filling phases, steel fiber as the reinforcing phase, and a high-performance water-reducing agent and low-volume mixing water as the dispersed phase. These materials are then efficiently mixed to create a slurry, which is then poured and cured to form cast-in-place structures or prefabricated components. As modern infrastructure projects move to remote and environmentally harsh areas with limited access, the demand for ultra-high-toughness engineering materials is increasing. However, mixing ultra-high-toughness engineering material slurries at traditional mixing plants and transporting them to construction sites for pouring and construction, or converting them into large prefabricated components, requires high transportation requirements. Transporting slurry mixers or large prefabricated components to remote and environmentally harsh locations is difficult. Consequently, industry practitioners have begun focusing on developing ultra-high-toughness engineering material mixtures. These mixtures are dry-premixed at the factory, bagged, and shipped to the construction site for mixing with water and a water-reducing agent before use.

[0004] An ideal mixture of ultra-high-toughness engineering materials requires that the particles of each component raw material be nearly spherical, small in size and well-graded, and the fibers be ultra-uniformly dispersed. However, the factory dry premixing method requires good raw material quality, multiple raw material silos, complex ingredients, and difficulty in material metering and mixing. As a result, the prepared ultra-high-toughness engineering material mixtures generally have problems such as the inability to introduce coarse aggregate, poor dispersion of the components, and uneven distribution, resulting in large fluctuations in the quality and performance of the mixture. Summary of the Invention

[0005] The present invention aims to solve the common problems in ultra-high toughness engineering material mixtures prepared by the current factory dry premixing method, such as the inability to introduce coarse aggregate, poor dispersion and uneven distribution of the component materials, which result in the difficulty in controlling the quality of the mixture during use and large fluctuations. An ultra-high toughness engineering material mixture and a preparation method thereof are proposed.

[0006] In order to achieve the above technical objectives, the technical solution provided by the present invention is:

[0007] A mixture of ultra-high toughness engineering materials comprises the following raw materials, calculated by dry mass percentage: 40% to 50% of high-titanium heavy slag crushed stone, 25% to 35% of high-titanium heavy slag sand, 15% to 20% of Portland cement clinker powder, 3% to 4% of lithium slag powder, 3.5% to 4.0% of silica fume and 1.5% to 2.0% of chopped fibers.

[0008] Furthermore, all particles of the ultra-high toughness engineering material mixture are below 10 mm, of which 5mm-10mm particles account for 20%-25%, particles smaller than 0.045mm account for 30%-40%, and the remaining particles are larger than 0.045mm and smaller than 5mm, and the uniformity of the mixture is greater than 90%.

[0009] Furthermore, after the ultra-high toughness engineering material mixture is mixed with 6% to 8% water by mass of the mixture, the slurry formed has a slump of 250 to 280 mm and an expansion greater than 600 to 650 mm. The hardened body after curing for 28 days has a compressive strength of 120 to 140 MPa and a flexural strength of 15 to 20 MPa.

[0010] Furthermore, the particle size of the high-titanium heavy slag crushed stone is 10 mm to 20 mm, and the mass percentage of TiO2 in its chemical composition is ≥20%.

[0011] Furthermore, the particle size of the high-titanium heavy slag sand is less than 5 mm, of which the mass proportion of particles less than 0.045 mm is not less than 10%; and the mass percentage of TiO2 in its chemical composition is ≥20%.

[0012] Furthermore, the mass percentage of particles below 0.045 mm in the Portland cement clinker powder is greater than 80%.

[0013] Furthermore, the SO3 content in the chemical composition of the lithium slag powder is not less than 15%, and the dihydrate gypsum content in the mineral composition is not less than 30%.

[0014] Furthermore, the silica fume is SF90 silica fume.

[0015] Furthermore, the chopped fibers are any one of chopped basalt fibers, chopped carbon fibers, chopped polypropylene fibers, and chopped polyethylene glycol fibers, or a mixture of two or more thereof.

[0016] The present invention also provides a method for preparing an ultra-high toughness engineering material mixture, which comprises mixing high-titanium heavy slag crushed stone, high-titanium heavy slag sand, silicate cement clinker powder, lithium slag powder, silica fume, and chopped fibers in a certain proportion, placing the mixture in a mill without grinding media for self-crushing and self-grinding, and spraying a dispersant to obtain an ultra-high toughness engineering material mixture.

[0017] Furthermore, the dispersant accounts for 6‰ of the raw material mass

[0018] Furthermore, the dispersant is a mixture of a high-performance polycarboxylate water-reducing agent, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water-reducing agent is not less than 90%.

[0019] The present invention has the following beneficial effects:

[0020] 1. The present invention changes the previous process of manufacturing ultra-high toughness engineering material mixtures that relies solely on the mixing action of a dry mixer. It can not only introduce coarse aggregates, but also crush and grind coarse particles during the mixture manufacturing process, so that material particles of different sizes are synchronously shaped, the particles are refined, and the gradation is optimized, thereby solving the problem of poor dispersion and uneven distribution of the component materials, which leads to large fluctuations in the quality and performance of the mixture.

[0021] 2. The ultra-high toughness engineering material mixture provided by the present invention has all raw materials other than silicate cement clinker powder and chopped fibers as solid waste, with a solid waste content of up to 88%, so it has green, low-carbon and environmentally friendly properties.

[0022] 3. The preparation method of the ultra-high toughness engineering material mixture provided by the present invention uses a mill without grinding media, so that in addition to the mixing process, the preparation process also introduces self-crushing and self-grinding processes, which greatly reduces the requirements for the particle size and gradation of each raw material particle of the mixture, greatly simplifies the ingredients and processing process, and the dispersion of the prepared mixture material particles, particle distribution and uniformity of the distribution of each raw material particle are greatly improved.

[0023] 4. The present invention provides a method for preparing an ultra-high toughness engineering material mixture. During the preparation process, no grinding media is used in the mill. High-titanium heavy slag gravel and high-titanium heavy slag sand are used as self-crushing and self-grinding media: first, the particles directly rub against each other, making the particle shape more rounded, and the sphericity and roundness of the particles better; second, during the self-crushing and grinding process, the particle grading of the mixture is further optimized; third, the dispersion and distribution uniformity of various materials are greatly improved.

[0024] 5. The ultra-high toughness engineering material mixture provided by the present invention can be directly transported to the construction site in bags for use. During use, only mixing water needs to be added according to the mass percentage of the material. It is convenient to transport and simple to use.

[0025] 6. The ultra-high toughness engineering material mixture provided by the present invention also contains lithium slag, which contains a large amount of dihydrate gypsum, which can stimulate the hydration of cement clinker. At the same time, the lithium slag participates in the hydration to form expansive hydration products, thereby effectively reducing the self-shrinkage of the ultra-high toughness engineering material. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solution of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate directions or positional relationships for the sole purpose of facilitating and simplifying the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] A mixture of ultra-high toughness engineering materials comprises the following raw materials, calculated by dry mass percentage: 40% to 50% of high-titanium heavy slag crushed stone, 25% to 35% of high-titanium heavy slag sand, 15% to 20% of Portland cement clinker powder, 3% to 4% of lithium slag powder, 3.5% to 4.0% of silica fume and 1.5% to 2.0% of chopped fibers.

[0030] The coarse aggregate of the present invention can be selected from natural rocks such as quartz, basalt, and granite with good wear resistance and toughness, as well as industrial solid waste aggregates such as steel slag and alloy slag. However, high-titanium heavy slag is preferred. First, high-titanium slag is an industrial waste slag with low cost, which contributes to the comprehensive utilization of resources. Second, compared with the above-mentioned natural ores, high-titanium slag has better wear resistance and toughness in particles. Compared with the above-mentioned waste slag, high-titanium slag has better chemical stability and will not leach harmful substances or cause harmful aggregate expansion reactions. In addition, the lithium slag powder of the present invention is a preferred component: first, it contains active aluminosilicate pozzolanic components, which have significant filling and hydration effects and can further reduce the cement clinker content. Second, the development time of the pozzolanic active reaction of lithium slag is relatively slow, which can reduce the hydration heat during the coagulation and hardening process of ultra-high toughness materials, thereby reducing the internal and external temperature difference, reducing internal temperature stress and the generation of microcracks. Third, lithium slag also contains dihydrate gypsum. The calcium aluminate generated by dihydrate gypsum participating in cement hydration is expansive and can offset the cement hydration self-shrinkage, thereby improving the volume stability of the material. Portland cement clinker powder and chopped fibers are necessary. Portland cement clinker powder is the main cementitious material, which provides the main strength of the engineering material after hydration and hardening, while the chopped fibers are used to provide toughness.

[0031] Specifically, all the particles of the ultra-high toughness engineering material mixture are below 10 mm, of which 5mm-10mm particles account for 20%-25%, particles less than 0.045mm account for 30%-40%, and the remaining particles are larger than 0.045mm and smaller than 5mm, and the uniformity of the mixture is greater than 90%; after the ultra-high toughness engineering material mixture is mixed with water accounting for 6%-8% of the mixture mass percentage, the slurry formed has a slump of 250-280 mm and an expansion greater than 600-650 mm. The hardened body after curing for 28 days has a compressive strength of 120-140 MPa and a flexural strength of 15-20 MPa.

[0032] Specifically, the high-titanium heavy slag crushed stone particles are made from molten slag produced during the smelting of vanadium-titanium magnetite in a blast furnace, which is hot-sprayed and naturally cooled, and then crushed and screened. The size is 10mm to 20mm, and the mass percentage of TiO2 in its chemical composition is ≥20%. The high-titanium heavy slag with a mass percentage of TiO2 ≥20% has a stable chemical structure and is suitable as an aggregate. The crushed stone with a particle size of 10mm to 20mm has heavy weight and good toughness, and can be used as a grinding medium in the self-grinding process.

[0033] Specifically, the high-titanium heavy slag sand is formed by hot pouring and natural cooling of the molten slag produced during the smelting of vanadium-titanium magnetite in a blast furnace, and then crushing and screening. The particle size is less than 5 mm, of which the mass proportion of particles less than 0.045 mm is not less than 10%; the mass percentage of TiO2 in its chemical composition is ≥20%. The chemical structure of high-titanium heavy slag with a mass percentage of TiO2 ≥20% is stable and has low activity. The smaller the particle size, the higher the activity, which is conducive to the formation of high strength in the later stage. Therefore, the mass proportion of particles less than 0.045 mm is restricted.

[0034] Specifically, the Portland cement clinker powder is a powder material prepared by grinding Portland cement clinker in a ball mill, which meets the requirements of GB / T21372 "Portland cement clinker", and the mass percentage of particles below 0.045 mm is greater than 80%.

[0035] Specifically, the lithium slag powder is obtained by drying the mud produced in the process of lithium extraction from spodumene by sulfuric acid method in a dryer at about 65°C. The SO3 content in the chemical composition is not less than 15%, and the dihydrate gypsum content in the mineral composition is not less than 30%. The SO3 in the lithium slag powder can, on the one hand, stimulate the activity of high-titanium slag fine powder, and on the other hand, compensate for the shrinkage produced during the cement hydration process.

[0036] Specifically, the silica fume is SF90 silica fume that meets the requirements of GB / T 27690 "Silica fume for mortar and concrete".

[0037] Specifically, the chopped fibers are any one of chopped basalt fibers, chopped carbon fibers, chopped polypropylene fibers, and chopped polyethylene glycol fibers, or a mixture of two or more thereof.

[0038] The present invention also provides a method for preparing an ultra-high toughness engineering material mixture, which comprises mixing high-titanium heavy slag crushed stone, high-titanium heavy slag sand, silicate cement clinker powder, lithium slag powder, silica fume, and chopped fibers in a certain proportion and placing the mixture in a mill without grinding media for self-crushing and self-grinding. The mixture relies on the mutual impact and friction between the particles to achieve self-crushing and self-grinding, and then spraying a dispersant to obtain an ultra-high toughness engineering material mixture.

[0039] Specifically, the dispersant accounts for 6‰ of the mass of the raw material entering the mill.

[0040] Specifically, the dispersant is a mixture of high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

[0041] Example 1

[0042] A method for preparing an ultra-high toughness engineering material mixture comprises the following steps: mixing 40% high-titanium heavy slag crushed stone, 35% high-titanium heavy slag sand, 15% silicate cement clinker powder, 4% lithium slag powder, 4.0% silica fume, and 2.0% chopped basalt fiber, and placing the mixture in a mill without grinding media for self-crushing and self-grinding. The mixture relies on the mutual impact and friction between particles to achieve self-crushing and self-grinding, and a dispersant accounting for 6‰ of the mass of the mill raw materials is sprayed into the mixture to obtain the ultra-high toughness engineering material mixture.

[0043] Specifically, the particles of the prepared ultra-high toughness engineering material mixture are all below 10 mm, of which 5mm-10mm particles account for 20%, particles less than 0.045mm account for 35%, and the uniformity of the mixture is 94%; after mixing with water accounting for 7% of the mixture mass percentage, the slurry formed has a slump of 250mm and an expansion of 620mm. The hardened body after curing for 28 days has a compressive strength of 135.8MPa and a flexural strength of 15.2MPa.

[0044] Specifically, the dispersant is a mixture of high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

[0045] Example 2

[0046] A method for preparing an ultra-high toughness engineering material mixture comprises the following steps: mixing 40% high-titanium heavy slag crushed stone, 32% high-titanium heavy slag sand, 18% silicate cement clinker powder, 4% lithium slag powder, 4.0% silica fume, and 2.0% chopped carbon fiber, and placing the mixture in a mill without grinding media for self-crushing and self-grinding. The mixture relies on the mutual impact and friction between particles to achieve self-crushing and self-grinding, and a dispersant accounting for 6‰ of the mass of the mill raw materials is sprayed into the mixture to obtain the ultra-high toughness engineering material mixture.

[0047] Specifically, the particles of the prepared ultra-high toughness engineering material mixture are all below 10 mm, of which 5mm-10mm particles account for 21%, particles less than 0.045mm account for 38%, and the uniformity of the mixture is 96%; after mixing with water accounting for 8% of the mass percentage of the mixture, the slurry formed has a slump of 275mm and an expansion of 650mm. The hardened body after curing for 28 days has a compressive strength of 139.2MPa and a flexural strength of 16.9MPa.

[0048] Specifically, the dispersant is a mixture of high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

[0049] Example 3

[0050] A method for preparing an ultra-high-toughness engineering material mixture comprises the following steps: mixing 40% high-titanium heavy slag crushed stone, 30% high-titanium heavy slag sand, 20% silicate cement clinker powder, 4% lithium slag powder, 4.0% silica fume, and 2.0% chopped polypropylene fiber, and placing the mixture in a mill without grinding media for self-crushing and self-grinding. The mixture relies on the mutual impact and friction between particles to achieve self-crushing and self-grinding, and a dispersant accounting for 6‰ of the mass of the mill raw materials is sprayed into the mixture to obtain the ultra-high-toughness engineering material mixture.

[0051] Specifically, the particles of the prepared ultra-high toughness engineering material mixture are all below 10 mm, of which 5mm-10mm particles account for 22%, particles less than 0.045mm account for 40%, and the mixture uniformity is 97%; after mixing with water accounting for 8% of the mixture mass percentage, the formed slurry has a slump of 280mm and an expansion of 650mm. The hardened body after curing for 28 days has a compressive strength of 138.9MPa and a flexural strength of 19.8MPa.

[0052] Specifically, the dispersant is a mixture of high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

[0053] Example 4

[0054] A method for preparing an ultra-high toughness engineering material mixture comprises the following steps: mixing 45% high-titanium heavy slag crushed stone, 32% high-titanium heavy slag sand, 15% Portland cement clinker powder, 3% lithium slag powder, 3.5% silica fume and 1.5% chopped polyethylene glycol fiber, and placing the mixture in a mill without grinding media for self-crushing and self-grinding. The mixture relies on the mutual impact and friction between particles to achieve self-crushing and self-grinding, and a dispersant accounting for 6‰ of the mass of the mill raw materials is sprayed into the mixture to obtain the ultra-high toughness engineering material mixture.

[0055] Specifically, the particles of the prepared ultra-high toughness engineering material mixture are all below 10 mm, of which 5mm-10mm particles account for 22%, particles less than 0.045mm account for 33%, and the uniformity of the mixture is 94%; after mixing with water accounting for 6% of the mass percentage of the mixture, the slurry formed has a slump of 270mm and an expansion of 630mm. The hardened body after curing for 28 days has a compressive strength of 129.5MPa and a flexural strength of 15.4MPa.

[0056] Specifically, the dispersant is a mixture of high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

[0057] Example 5

[0058] A method for preparing an ultra-high toughness engineering material mixture comprises the following steps: mixing 45% high-titanium heavy slag crushed stone, 28% high-titanium heavy slag sand, 18% Portland cement clinker powder, 3.5% lithium slag powder, 4.0% silica fume and 1.5% chopped basalt fiber, and placing the mixture in a mill without grinding media for self-crushing and self-grinding. The mixture relies on the mutual impact and friction between particles to achieve self-crushing and self-grinding, and a dispersant accounting for 6‰ of the mass of the mill raw materials is sprayed into the mixture to obtain the ultra-high toughness engineering material mixture.

[0059] Specifically, the particles of the prepared ultra-high toughness engineering material mixture are all below 10 mm, of which 5mm-10mm particles account for 23%, particles less than 0.045mm account for 36%, and the uniformity of the mixture is 95%; after mixing with water accounting for 7% of the mixture mass percentage, the slurry formed has a slump of 270mm and an expansion of 630mm. The hardened body after curing for 28 days has a compressive strength of 134.6MPa and a flexural strength of 17.4MPa.

[0060] Specifically, the dispersant is a mixture of high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

[0061] Example 6

[0062] A method for preparing an ultra-high toughness engineering material mixture comprises the following steps: mixing 45% high-titanium heavy slag crushed stone, 25% high-titanium heavy slag sand, 20% Portland cement clinker powder, 4% lithium slag powder, 4.0% silica fume and 2.0% chopped carbon fiber, and placing the mixture in a mill without grinding media for self-crushing and self-grinding. The mixture relies on the mutual impact and friction between particles to achieve self-crushing and self-grinding, and a dispersant accounting for 6‰ of the mass of the mill raw materials is sprayed into the mixture to obtain the ultra-high toughness engineering material mixture.

[0063] Specifically, the particles of the prepared ultra-high toughness engineering material mixture are all below 10 mm, of which 5mm-10mm particles account for 24%, particles less than 0.045mm account for 37%, and the uniformity of the mixture is 95%; after mixing with water accounting for 8% of the mass percentage of the mixture, the slurry formed has a slump of 265mm and an expansion of 630mm. The hardened body after curing for 28 days has a compressive strength of 133.6MPa and a flexural strength of 18.2MPa.

[0064] Specifically, the dispersant is a mixture of high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

[0065] Example 7

[0066] A method for preparing an ultra-high toughness engineering material mixture comprises the following steps: mixing 50% high-titanium heavy slag crushed stone, 26% high-titanium heavy slag sand, 15% silicate cement clinker powder, 3% lithium slag powder, 4.0% silica fume and 2.0% chopped polypropylene fiber, placing the mixture in a mill without grinding media for self-crushing and self-grinding. The mixture relies on the mutual impact and friction between particles to achieve self-crushing and self-grinding, and spraying a dispersant accounting for 6‰ of the mass of the mill raw materials to obtain an ultra-high toughness engineering material mixture.

[0067] Specifically, the particles of the prepared ultra-high toughness engineering material mixture are all below 10 mm, of which 5mm-10mm particles account for 24%, particles less than 0.045mm account for 30%, and the uniformity of the mixture is 92%; after mixing with water accounting for 6% of the mass percentage of the mixture, the slurry formed has a slump of 265mm and an expansion of 610mm. The hardened body after curing for 28 days has a compressive strength of 121.3MPa and a flexural strength of 16.1MPa.

[0068] Specifically, the dispersant is a mixture of high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

[0069] Example 8

[0070] A method for preparing an ultra-high toughness engineering material mixture comprises the following steps: mixing 50% high-titanium heavy slag crushed stone, 27% high-titanium heavy slag sand, 15% silicate cement clinker powder, 3% lithium slag powder, 3.5% silica fume and 1.5% chopped polyethylene glycol fiber, placing the mixture in a mill without grinding media for self-crushing and self-grinding. The mixture relies on the mutual impact and friction between particles to achieve self-crushing and self-grinding, and a dispersant accounting for 6‰ of the mass of the mill raw materials is sprayed into the mixture to obtain the ultra-high toughness engineering material mixture.

[0071] Specifically, the particles of the prepared ultra-high toughness engineering material mixture are all below 10 mm, of which 5mm-10mm particles account for 23%, particles less than 0.045mm account for 32%, and the uniformity of the mixture is greater than 91%; after mixing with water accounting for 8% of the mass percentage of the mixture, the slurry formed has a slump of 250mm and an expansion of 600mm. The hardened body after curing for 28 days has a compressive strength of 125.1MPa and a flexural strength of 18.3MPa.

[0072] Specifically, the dispersant is a mixture of high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

[0073] Example 9

[0074] A method for preparing an ultra-high toughness engineering material mixture comprises the following steps: mixing 50% high-titanium heavy slag crushed stone, 25% high-titanium heavy slag sand, 16% silicate cement clinker powder, 3% lithium slag powder, 4.0% silica fume and 2.0% chopped polyethylene glycol fiber, placing the mixture in a mill without grinding media for self-crushing and self-grinding. The mixture relies on the mutual impact and friction between particles to achieve self-crushing and self-grinding, and a dispersant accounting for 6‰ of the mass of the mill raw materials is sprayed into the mixture to obtain the ultra-high toughness engineering material mixture.

[0075] Specifically, the particles of the prepared ultra-high toughness engineering material mixture are all below 10 mm, of which 5mm-10mm particles account for 25%, particles less than 0.045mm account for 34%, and the uniformity of the mixture is 94%; after mixing with water accounting for 8% of the mass percentage of the mixture, the slurry formed has a slump of 280mm and an expansion of 620mm. The hardened body after curing for 28 days has a compressive strength of 124.3MPa and a flexural strength of 17.5MPa.

[0076] Specifically, the dispersant is a mixture of high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

[0077] Comparative Example 1

[0078] A method for preparing an engineering material mixture is provided. The raw materials are weighed according to the raw material component ratio of Example 2, mixed, and placed in a conventional mixer for mixing. A dispersant accounting for 6‰ of the mass of the milled raw materials is sprayed into the mixture to obtain a comparative mixture.

[0079] Specifically, the prepared comparison mixture has 62% particles below 10 mm, 2% particles between 5 mm and 10 mm, 29% particles smaller than 0.045 mm, and 84% uniformity of the mixture; after mixing with 8% water by mass of the mixture, the formed slurries are dry and hard, with a slump and expansion of 0 mm, and the hardened body after curing for 28 days has a compressive strength of 65.8 MPa and a flexural strength of 7.8 MPa.

[0080] Specifically, the dispersant is a mixture of high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

[0081] Comparative Example 2

[0082] A method for preparing an engineering material mixture is provided. The raw materials are weighed according to the raw material component ratio of Example 5, mixed, and placed in a conventional mixer for mixing. A dispersant accounting for 6‰ of the mass of the milled raw materials is sprayed into the mixture to obtain a comparative mixture.

[0083] Specifically, the prepared comparison mixture has 58% particles below 10 mm, 2.5% particles between 5 mm and 10 mm, 28% particles smaller than 0.045 mm, and a mixture uniformity of 80%; after mixing with 8% water by mass of the mixture, the formed slurries are dry and hard, with a slump and expansion of 0 mm, and the hardened body after curing for 28 days has a compressive strength of 53.2 MPa and a flexural strength of 6.4 MPa.

[0084] Specifically, the dispersant is a mixture of high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

[0085] Comparative Example 3

[0086] A method for preparing an engineering material mixture is provided. The raw materials are weighed according to the raw material component ratio of Example 8, mixed, and placed in a conventional mixer for mixing. A dispersant accounting for 6‰ of the mass of the milled raw materials is sprayed into the mixture to obtain a comparative mixture.

[0087] Specifically, the prepared comparison mixture has 53% particles below 10 mm, 2.9% particles between 5 mm and 10 mm, 22% particles smaller than 0.045 mm, and a mixture uniformity of 75%; after mixing with 8% water by mass of the mixture, the formed slurries are dry and hard, with a slump and expansion of 0 mm, and the hardened body after curing for 28 days has a compressive strength of 43.9 MPa and a flexural strength of 5.2 MPa.

[0088] Specifically, the dispersant is a mixture of high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

[0089] Table 1 Mixture ratio design

[0090]

[0091] Table 2 Mixture particle distribution

[0092]

[0093]

[0094] Table 3 Mixture performance

[0095]

[0096]

[0097] It can be seen from the data in Table 2 that the ultra-high toughness engineering material mixture prepared by the example of the present invention adopts a synchronous process of mixing, self-crushing and self-grinding, so all particles in the mixture are below 10 mm, the particle dispersion and distribution uniformity are good, and the mixture uniformity is above 90%; while the comparative example only undergoes a conventional mixing process, the proportion of particles above 10 mm is high, the particles are distributed in a discontinuous gradation state, and the uniformity is below 85%.

[0098] The data in Table 3 show that the ultra-high-toughness engineering material mixture prepared in the examples of the present invention, when directly mixed with an appropriate amount of water, produces a slurry with excellent workability, a slump of 250mm-280mm, and a spread of 600mm-650mm. The hardened form exhibits extremely high load-bearing capacity and toughness, namely, extremely high compressive and flexural strengths. The comparative example mixture, however, only underwent a conventional mixing process, resulting in a high proportion of particles larger than 10mm, a discontinuous distribution of particles, and a uniformity of less than 85%. Therefore, when directly mixed with an appropriate amount of water, the slurry becomes dry and hard, and the compressive and flexural strengths of the hardened form only meet the requirements of conventional high-grade concrete or high-strength concrete, but fail to meet the mechanical performance requirements of ultra-high-toughness engineering materials.

[0099] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

[0100] The above specific implementation methods are detailed descriptions of the present invention. It cannot be considered that the specific implementation methods of the present invention are limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions and substitutions without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A method for preparing an ultra-high toughness engineering material mixture, characterized in that: High-titanium heavy slag crushed stone, high-titanium heavy slag sand, Portland cement clinker powder, lithium slag powder, silica fume, and chopped fibers are mixed in a certain proportion, placed in a mill without grinding media, and subjected to self-crushing and self-grinding, and a dispersant is sprayed into the mill to obtain an ultra-high toughness engineering material mixture; Components calculated by dry weight percentage: 40% to 50% high-titanium heavy slag crushed stone, 25% to 35% high-titanium heavy slag sand, 15% to 20% Portland cement clinker powder, 3% to 4% lithium slag powder, 3.5% to 4.0% silica fume and 1.5% to 2.0% chopped fiber; All particles of the ultra-high toughness engineering material mixture are below 10 mm, of which 5mm~10mm particles account for 20%~25%, particles smaller than 0.045mm account for 30%~40%, and the remaining particles are larger than 0.045mm and smaller than 5mm, and the uniformity of the mixture is greater than 90%.

2. The method for preparing an ultra-high toughness engineering material mixture according to claim 1, characterized in that: After the ultra-high toughness engineering material mixture is mixed with water accounting for 6% to 8% by mass of the mixture, the slurry formed has a slump of 250 to 280 mm and an expansion greater than 600 to 650 mm. The hardened body after curing for 28 days has a compressive strength of 120 to 140 MPa and a flexural strength of 15 to 20 MPa.

3. The method for preparing an ultra-high toughness engineering material mixture according to claim 1, characterized in that: The particle size of the high-titanium heavy slag crushed stone is 10 mm to 20 mm, and the mass percentage of TiO2 in its chemical composition is ≥20%.

4. The method for preparing an ultra-high toughness engineering material mixture according to claim 1, characterized in that: The particle size of the high-titanium heavy slag sand is less than 5 mm, of which the mass proportion of particles less than 0.045 mm is not less than 10%; the mass percentage of TiO2 in its chemical composition is ≥20%.

5. The method for preparing an ultra-high toughness engineering material mixture according to claim 1, characterized in that: The mass percentage of particles below 0.045 mm in the Portland cement clinker powder is greater than 80%.

6. The method for preparing an ultra-high toughness engineering material mixture according to claim 1, characterized in that: The SO3 content in the chemical composition of the lithium slag powder is not less than 15%, and the dihydrate gypsum content in the mineral composition is not less than 30%.

7. The method for preparing an ultra-high toughness engineering material mixture according to claim 1, characterized in that: The silica fume is SF90 silica fume.

8. The method for preparing an ultra-high toughness engineering material mixture according to claim 1, characterized in that: The chopped fibers are any one of chopped basalt fibers, chopped carbon fibers, chopped polypropylene fibers, and chopped polyethylene glycol fibers, or a mixture of two or more thereof.

9. The method for preparing an ultra-high toughness engineering material mixture according to claim 1, characterized in that: The dispersant accounts for 6‰ of the mass of the raw materials entering the mill.

10. The method for preparing an ultra-high toughness engineering material mixture according to claim 1, characterized in that: The dispersant is a mixture of a high-performance polycarboxylate water reducer, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, and graphene oxide dispersion, wherein the mass percentage of the high-performance polycarboxylate water reducer is not less than 90%.

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