All-solid-waste self-excitation concrete as well as preparation method and application thereof

Abstract

The invention relates to the technical field of building materials, in particular to all-solid-waste self-excitation concrete as well as a preparation method and application thereof. The all-solid-waste self-excitation concrete is prepared from the following raw material components: recycled coarse aggregate, iron tailing sand, activated coal gangue powder, mineral powder, desulfurized fly ash, an alkali activator, a water reducing agent, a mud inhibitor and water, wherein the mud inhibitor is prepared from the following raw materials: fatty alcohol, polyoxyethylene ether and hexadecylamine. The mud inhibitor can stably adsorb muddy fine powder in the iron tailing sand, and occupies adsorption sites on the surface of the muddy fine powder, so that adsorption of the muddy fine powder on a water reducing agent is avoided, and the flowability of concrete slurry is improved. The raw materials are simple and easy to obtain, the cost is low, and the fluidity and the mechanical property of the concrete are effectively improved through the synergistic effect of all the components. The invention effectively solves the problems of high energy consumption, high cost, poor efficiency and complex treatment process caused by the fact that the used treatment material does not have water solubility in the tailing desilting technology in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and in particular to a self-excited concrete made of all-solid waste and a preparation method and application thereof. Background Art

[0002] All-solid waste concrete refers to concrete made entirely of solid waste materials, which mainly include granulated blast furnace slag, steel slag, red mud, waste gypsum and tailings sand. Among them, tailings sand is the solid waste discharged after the mine grinds the ore to extract valuable elements. At present, it is reported that tailings sand, as an aggregate for all-solid waste concrete, can effectively improve the strength of all-solid waste concrete. However, the use of tailings sand as an aggregate for all-solid waste concrete requires pretreatment. Although crushing, screening and washing can remove most of the mud and harmful ions attached to the tailings sand, there is still a part of the mud fine powder that cannot be completely removed. This kind of mud fine powder adheres to the surface of the aggregate, causing preferential adsorption of the water reducer, and has a high water demand. It will absorb water during the preparation process of all-solid waste concrete, reduce the fluidity of the concrete slurry, increase the viscosity of the slurry, and affect the working performance and mechanical properties of all-solid waste concrete. Therefore, how to achieve the removal of mud fine powder in tailings sand has become a major problem in the reuse of tailings sand.

[0003] Traditional tailings sand desludging technology is mainly classification or concentration desludging technology, but this type of technology has high energy consumption, high cost and low efficiency. In recent years, with the development of flocculation theory, flocculants suitable for tailings sand have been developed, such as polyacrylamide, sodium hexametaphosphate or fatty acid salts. By adding flocculants to tailings sand, the mud attached to the tailings sand can be aggregated to form floccules, but this type of flocculant is usually not water-soluble and still needs to be washed with a large amount of water to be removed, and the treatment process is complicated. Based on this, the development of a solid waste concrete that can inhibit the influence of fine mud powder in aggregates on concrete and is easy to prepare has great practical significance in the field of building materials. Summary of the invention

[0004] In view of the problems in the prior art of tailings desludging technology, such as high energy consumption, high cost, poor efficiency, and the fact that the treatment materials used are not water-soluble, resulting in complicated treatment procedures, the present invention provides a self-stimulating concrete made of all-solid waste and a preparation method and application thereof. The present invention uses fatty alcohol, polyoxyethylene ether and hexadecylamine as raw materials to prepare a mud inhibitor, which can stably adsorb the mud fine powder in the iron tailings sand through the attraction of positive and negative charges, occupying the adsorption sites on the surface of the mud fine powder, thereby avoiding the adsorption of the mud fine powder on the water reducer, improving the fluidity of the concrete slurry, and reducing the viscosity of the concrete slurry. The mud fine powder adsorbed by the mud inhibitor can also play a role of micro-filling in the concrete slurry, thereby improving the mechanical properties of the self-stimulating concrete made of all-solid waste.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: The first aspect of the present invention provides an all-solid waste self-stimulating concrete, comprising the following raw material components in parts by weight: 900-1000 parts of recycled coarse aggregate, 750-800 parts of iron tailings sand, 80-120 parts of activated coal gangue powder, 160-240 parts of mineral powder, 190-230 parts of desulfurized ash, 85-105 parts of alkali activator, 14-16 parts of water reducer, 17-20 parts of mud inhibitor and 190-210 parts of water; Wherein, the raw material components of the mud inhibitor include C 12 -C 18 of fatty alcohols, polyoxyethylene ethers and hexadecylamine.

[0006] Compared with the prior art, the present invention uses C 12 -C 18 A mud inhibitor that can inhibit the adsorption of mud fine powder in aggregate to water reducer was prepared using fatty alcohol, polyoxyethylene ether and hexadecylamine as the main raw materials. 12 -C 18 The fatty alcohol is not only rich in hydroxyl groups but also has a hydrophobic carbon chain, which can form a film at the water / oil interface; polyoxyethylene ether contains long chains and ether bonds, and has good emulsification and dispersibility. The hydrophobic end of the long chain can react with the hydrophobic carbon chain of the fatty alcohol, while the hydrophilic end of the long chain combines with water molecules, which helps to form a stable dispersion system. The hexadecylamine molecule forms hydrogen bonds with the hydroxyl groups of the fatty alcohol on the one hand, and activates with the polyoxyethylene ether on the other hand, and the three combine to form a stable adsorption layer structure. More importantly, the positive charge part of the hexadecylamine molecule can attract the negative charge on the surface of the mud fine powder, occupying the adsorption site on the surface of the mud fine powder. Combined with the effects of fatty alcohol and polyoxyethylene ether, strong and stable adsorption of mud fine powder can be achieved; and thus the adsorption of mud fine powder on water reducer is reduced, the fluidity of concrete slurry is improved, and the viscosity of slurry is reduced. At the same time, the mud fine powder adsorbed by the mud inhibitor can play a micro-filling role in the concrete slurry, thereby improving the mechanical properties of the all-solid waste self-excited concrete.

[0007] In addition, the present invention uses activated coal gangue powder, mineral powder and desulfurized ash as active components, which can reduce the sensitivity of the water reducer to mud fine powder and improve the working performance of the concrete; and recycled coarse aggregate and iron tailings sand are used as aggregates to achieve full solid waste substitution of aggregates and save the preparation cost of concrete. The present invention utilizes the synergistic effect of each component, which not only successfully inhibits the adsorption of mud fine powder on the water reducer, but also effectively improves the mechanical properties of the all-solid waste self-excited concrete. The raw material components used in the present invention are simple, easy to obtain, and low in cost, providing a new idea for the preparation of all-solid waste concrete and the recycling of solid waste materials.

[0008] Preferably, the C12 -C 18 The fatty alcohol is any one of lauryl alcohol, hexadecanol or stearyl alcohol.

[0009] Preferably, the preparation method of the mud inhibitor comprises the following steps: Step a, dissolving fatty alcohol, polyoxyethylene ether and strong base in deionized water, and performing hydrothermal reaction at 90° C.-95° C. to obtain a first mixed material; Step b, uniformly mixing the first mixed material and the metal catalyst, and performing an activation reaction at 200° C.-220° C. to obtain a second mixed material; Step c: adding an alcohol solution of hexadecylamine to the second mixture, and carrying out a hydrothermal reaction at 96° C.-98° C. in an inert atmosphere to obtain a mud inhibitor.

[0010] Further preferably, in step a, the mass ratio of the fatty alcohol, polyoxyethylene ether and strong base is 1:3:0.2-1.2:4:0.4.

[0011] Further preferably, the strong base is sodium hydroxide or potassium hydroxide.

[0012] Further preferably, in step a, the mass volume ratio of the fatty alcohol to deionized water is 1g:3mL-1g:4mL.

[0013] Further preferably, in step a, the hydrothermal reaction time is 40 min-60 min.

[0014] Further preferably, in step b, the metal catalyst is an iron-based catalyst or a cobalt-based catalyst.

[0015] Further preferably, in step b, the mass ratio of the first mixture to the metal catalyst is 1:0.01-1:0.03.

[0016] Further preferably, in step b, the holding time of the activation reaction is 2.5h-3.5h.

[0017] Further preferably, in step c, the mass percentage of hexadecylamine in the alcohol solution of hexadecylamine is 25%-35%; and the solvent of the alcohol solution of hexadecylamine is anhydrous ethanol.

[0018] Further preferably, in step c, the mass ratio of the second mixture to the alcohol solution of hexadecylamine is 2:1-2.2:1.

[0019] Further preferably, in step c, the hydrothermal reaction time is 1.5h-2.5h.

[0020] Preferably, the preparation method of the activated coal gangue powder comprises the following steps: calcining the coal gangue powder at 700° C.-750° C. and grinding to obtain the activated coal gangue powder.

[0021] More preferably, the temperature is increased to 700°C-750°C at a heating rate of 10°C / min-15°C / min.

[0022] More preferably, the calcination time is 3h-5h.

[0023] Further preferably, the particle size of the activated coal gangue powder is 10 μm-50 μm.

[0024] Preferably, the alkali activator is sodium silicate or slaked lime.

[0025] Preferably, the water reducer is a polycarboxylate water reducer.

[0026] Preferably, the mineral powder is of S95 grade or S105 grade.

[0027] Preferably, the particle size of the iron tailings sand is 0.1 mm-4.25 mm.

[0028] Preferably, the particle size of the recycled coarse aggregate is 5mm-16mm.

[0029] Preferably, the particle size of the desulfurized ash is 10 μm-75 μm.

[0030] The second aspect of the present invention provides a method for preparing all-solid waste self-excited concrete, comprising the following steps: Step 1, weighing the raw materials of each component according to the designed ratio, and evenly mixing the activated coal gangue powder, mineral powder, desulfurization ash, iron tailings sand and mud inhibitor to obtain a dry mix; Step 2: Add water reducing agent, water, alkali activator and recycled coarse aggregate to the dry mix in sequence, mix evenly to obtain slurry; shape, demould and cure the slurry to obtain all-solid waste self-activated concrete.

[0031] Preferably, the curing temperature is 28°C-32°C, and the curing humidity is 80%-90%.

[0032] The third aspect of the present invention provides the use of the all-solid waste self-exciting concrete or the all-solid waste self-exciting concrete prepared by the preparation method of the all-solid waste self-exciting concrete in the field of building materials.

[0033] In summary, the present invention adopts C 12 -C 18A mud inhibitor is prepared by using fatty alcohol, polyoxyethylene ether and hexadecylamine as raw materials. The mud inhibitor can stably adsorb the mud fine powder of aggregate and occupy the adsorption sites on the surface of the mud fine powder, thereby avoiding the adsorption of the mud fine powder on the water reducer, improving the fluidity of the concrete slurry, and reducing the viscosity of the slurry. In addition, the present invention utilizes the synergistic effect of each component to effectively improve the mechanical properties of the all-solid waste self-excited concrete. The raw material components used in the present invention are simple, easy to obtain, and low in cost, which provides a new idea for the preparation of all-solid waste concrete and the reuse of solid waste materials. The present invention effectively solves the problems of high energy consumption, high cost, poor efficiency, and complicated treatment process caused by the lack of water solubility of the treatment materials used in the prior art of tailings mud removal technology. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1 This embodiment provides a self-stimulated concrete made of solid waste, which specifically includes the following contents: The all-solid waste self-stimulated concrete includes the following raw material components by weight: 950g recycled coarse aggregate, 800g iron tailings sand, 90g activated coal gangue powder, 220g S95 grade mineral powder, 200g desulfurized ash, 100g sodium silicate, 15g polycarboxylate water reducer, 19g mud inhibitor and 200g water; The method for preparing all-solid waste self-excited concrete comprises the following steps: Step 1: dissolve 10 g of hexadecanol, 40 g of polyoxyethylene ether and 3 g of sodium hydroxide in 35 mL of deionized water, and perform hydrothermal reaction at 94° C. for 40 min to obtain a first mixed material; Step 2: Evenly mix the first mixed material and 1 g of the iron-based catalyst, and perform an activation reaction at 210° C. to obtain a second mixed material; Step 3: Add 35 g of a 30 wt% hexadecylamine ethanol solution to the second mixture, and perform a hydrothermal reaction at 97° C. for 2 h under an inert atmosphere to obtain a mud inhibitor; Step 4: weigh the raw materials of each component according to the designed ratio, and evenly mix the activated coal gangue powder, S95 grade ore powder, desulfurization ash, iron tailings sand and mud inhibitor to obtain a dry mix; Step 5: Add polycarboxylate water-reducing agent, water, sodium silicate and recycled coarse aggregate to the dry mix in sequence, mix well, and obtain slurry; shape the slurry, demold it, and cure it at 30° C. and a humidity of 85% for 28 days to obtain all-solid waste self-excited concrete.

[0036] The preparation method of the activated coal gangue powder comprises the following steps: heating the coal gangue powder to 720°C at a heating rate of 12°C / min for calcining for 4 hours, and grinding to obtain the activated coal gangue powder with a particle size of 40 μm.

[0037] The particle size of the iron tailings sand is 1.5 mm; the particle size of the recycled coarse aggregate is 8 mm; and the particle size of the desulfurized ash is 50 μm.

[0038] Example 2 This embodiment provides a self-stimulated concrete made of solid waste, which specifically includes the following contents: The all-solid waste self-stimulated concrete includes the following raw material components by weight: 1000g recycled coarse aggregate, 780g iron tailings sand, 110g activated coal gangue powder, 180g S105 grade ore powder, 220g desulfurized ash, 90g slaked lime, 15g polycarboxylate water reducer, 18g mud inhibitor and 200g water; The method for preparing all-solid waste self-excited concrete comprises the following steps: Step 1: dissolve 10 g of octadecyl alcohol, 40 g of polyoxyethylene ether and 3 g of sodium hydroxide in 35 mL of deionized water, and perform hydrothermal reaction at 95° C. for 40 min to obtain a first mixed material; Step 2: Evenly mix the first mixed material and 1 g of a cobalt-based catalyst, and perform an activation reaction at 210° C. to obtain a second mixed material; Step 3: Add 35 g of a 30 wt% hexadecylamine ethanol solution to the second mixture, and perform a hydrothermal reaction at 97° C. for 2 h under an inert atmosphere to obtain a mud inhibitor; Step 4: weigh the raw materials of each component according to the designed ratio, and evenly mix the activated coal gangue powder, S105 grade ore powder, desulfurization ash, iron tailings sand and mud inhibitor to obtain a dry mix; Step 5: Add polycarboxylic acid water-reducing agent, water, slaked lime and recycled coarse aggregate to the dry mix in sequence, mix well, and obtain slurry; shape the slurry, demold it, and cure it at 30° C. and a humidity of 85% for 28 days to obtain all-solid waste self-excited concrete.

[0039] The preparation method of the activated coal gangue powder comprises the following steps: heating the coal gangue powder to 730°C at a heating rate of 10°C / min for calcining for 4 hours, and grinding to obtain the activated coal gangue powder with a particle size of 40 μm.

[0040] The particle size of the iron tailings sand is 1.5 mm; the particle size of the recycled coarse aggregate is 8 mm; and the particle size of the desulfurized ash is 50 μm.

[0041] Example 3 This embodiment provides a self-stimulated concrete made of solid waste, which specifically includes the following contents: The all-solid waste self-stimulated concrete includes the following raw material components by weight: 950g recycled coarse aggregate, 800g iron tailings sand, 90g activated coal gangue powder, 220g S95 grade ore powder, 200g desulfurized ash, 100g slaked lime, 15g polycarboxylate water reducer, 19g mud inhibitor and 200g water; The method for preparing all-solid waste self-excited concrete comprises the following steps: Step 1: dissolve 10 g of dodecanol, 40 g of polyoxyethylene ether and 3 g of sodium hydroxide in 35 mL of deionized water, and perform hydrothermal reaction at 94° C. for 40 min to obtain a first mixed material; Step 2: Evenly mix the first mixed material and 1 g of the iron-based catalyst, and perform an activation reaction at 210° C. to obtain a second mixed material; Step 3: Add 35 g of a 30 wt% hexadecylamine ethanol solution to the second mixture, and perform a hydrothermal reaction at 97° C. for 2 h under an inert atmosphere to obtain a mud inhibitor; Step 4: weigh the raw materials of each component according to the designed ratio, and evenly mix the activated coal gangue powder, S95 grade ore powder, desulfurization ash, iron tailings sand and mud inhibitor to obtain a dry mix; Step 5: Add polycarboxylic acid water-reducing agent, water, slaked lime and recycled coarse aggregate to the dry mix in sequence, mix well, and obtain slurry; shape the slurry, demold it, and cure it at 30° C. and a humidity of 85% for 28 days to obtain all-solid waste self-excited concrete.

[0042] The preparation method of the activated coal gangue powder comprises the following steps: heating the coal gangue powder to 750°C at a heating rate of 15°C / min for calcining for 3 hours, and grinding to obtain the activated coal gangue powder with a particle size of 50 μm.

[0043] The particle size of the iron tailings sand is 1.5 mm; the particle size of the recycled coarse aggregate is 8 mm; and the particle size of the desulfurized ash is 50 μm.

[0044] Comparative Example 1 This comparative example provides a self-stimulated concrete made of all solid waste, which is different from Example 1 in that: the mud inhibitor does not contain polyoxyethylene ether, and specifically includes the following contents: The all-solid waste self-stimulated concrete includes the following raw material components by weight: 950g recycled coarse aggregate, 800g iron tailings sand, 90g activated coal gangue powder, 220g S95 grade mineral powder, 200g desulfurized ash, 100g sodium silicate, 15g polycarboxylate water reducer, 19g mud inhibitor and 200g water; The method for preparing all-solid waste self-excited concrete comprises the following steps: Step 1: dissolving 10 g of hexadecanol and 3 g of sodium hydroxide in 35 mL of deionized water, and performing a hydrothermal reaction at 94° C. for 40 min to obtain a first mixed material; Step 2: Evenly mix the first mixed material and 1 g of the iron-based catalyst, and perform an activation reaction at 210° C. to obtain a second mixed material; Step 3: Add 35 g of a 30 wt% hexadecylamine ethanol solution to the second mixture, and perform a hydrothermal reaction at 97° C. for 2 h under an inert atmosphere to obtain a mud inhibitor; Step 4: weigh the raw materials of each component according to the designed ratio, and evenly mix the activated coal gangue powder, S95 grade ore powder, desulfurization ash, iron tailings sand and mud inhibitor to obtain a dry mix; Step 5: Add polycarboxylate water-reducing agent, water, sodium silicate and recycled coarse aggregate to the dry mix in sequence, mix well, and obtain slurry; shape the slurry, demold it, and cure it at 30° C. and a humidity of 85% for 28 days to obtain all-solid waste self-excited concrete.

[0045] The preparation method of the activated coal gangue powder comprises the following steps: heating the coal gangue powder to 720°C at a heating rate of 12°C / min for calcining for 4 hours, and grinding to obtain the activated coal gangue powder with a particle size of 40 μm.

[0046] The particle size of the iron tailings sand is 1.5 mm; the particle size of the recycled coarse aggregate is 8 mm; and the particle size of the desulfurized ash is 50 μm.

[0047] Comparative Example 2 This comparative example provides a self-stimulated concrete made of all solid waste, which is different from Example 1 in that the mud inhibitor is replaced with an equal amount of polyacrylamide, and specifically includes the following contents: The all-solid waste self-stimulated concrete includes the following raw material components by weight: 950g recycled coarse aggregate, 800g iron tailings sand, 90g activated coal gangue powder, 220g S95 grade slag, 200g desulfurized ash, 100g sodium silicate, 15g polycarboxylate water reducer, 19g polyacrylamide and 200g water; The method for preparing all-solid waste self-excited concrete comprises the following steps: Step 1: weigh the raw materials of each component according to the designed ratio, and evenly mix the activated coal gangue powder, S95 grade ore powder, desulfurization ash, iron tailings sand and mud inhibitor to obtain a dry mix; Step 2: Add polycarboxylate water-reducing agent, water, sodium silicate and recycled coarse aggregate to the dry mix in sequence, mix well, and obtain slurry; shape the slurry, demold it, and cure it at 30° C. and 85% humidity for 28 days to obtain all-solid waste self-excited concrete.

[0048] The preparation method of the activated coal gangue powder comprises the following steps: heating the coal gangue powder to 720°C at a heating rate of 12°C / min for calcining for 4 hours, and grinding to obtain the activated coal gangue powder with a particle size of 40 μm.

[0049] The particle size of the iron tailings sand is 1.5 mm; the particle size of the recycled coarse aggregate is 8 mm; and the particle size of the desulfurized ash is 50 μm.

[0050] Comparative Example 3 This comparative example provides a self-stimulated concrete made of all solid waste, which is different from Example 1 in that the mud inhibitor is omitted and specifically includes the following contents: The all-solid waste self-stimulated concrete includes the following raw material components by weight: 950g recycled coarse aggregate, 800g iron tailings sand, 90g activated coal gangue powder, 220g S95 grade mineral powder, 200g desulfurized ash, 100g sodium silicate, 15g polycarboxylate water reducer, 19g mud inhibitor and 200g water; The method for preparing all-solid waste self-excited concrete comprises the following steps: Step 1: weigh the raw materials of each component according to the designed ratio, and evenly mix the activated coal gangue powder, S95 grade ore powder, desulfurization ash, iron tailings sand and mud inhibitor to obtain a dry mix; Step 2: Add polycarboxylate water-reducing agent, water, sodium silicate and recycled coarse aggregate to the dry mix in sequence, mix well, and obtain slurry; shape the slurry, demold it, and cure it at 30° C. and 85% humidity for 28 days to obtain all-solid waste self-excited concrete.

[0051] The preparation method of the activated coal gangue powder comprises the following steps: heating the coal gangue powder to 720°C at a heating rate of 12°C / min for calcining for 4 hours, and grinding to obtain the activated coal gangue powder with a particle size of 40 μm.

[0052] The particle size of the iron tailings sand is 1.5 mm; the particle size of the recycled coarse aggregate is 8 mm; and the particle size of the desulfurized ash is 50 μm.

[0053] Comparative Example 4 This comparative example provides a self-stimulated concrete made of all solid waste. The difference from comparative example 3 is that the water reducer is replaced by a ZY-KN polycarboxylic acid high-performance water reducer (anti-mud water reducer), which specifically includes the following contents: The all-solid waste self-stimulated concrete includes the following raw material components by weight: 950g recycled coarse aggregate, 800g iron tailings sand, 90g activated coal gangue powder, 220g S95 grade slag, 200g desulfurized ash, 100g sodium silicate, 15g ZY-KN polycarboxylic acid high-performance water reducer and 200g water; The method for preparing all-solid waste self-excited concrete comprises the following steps: Step 1, weighing each component raw material according to the designed ratio, and evenly mixing the activated coal gangue powder, S95 grade ore powder, desulfurization ash and iron tailings sand to obtain a dry mix; Step 2: Add ZY-KN polycarboxylic acid high-performance water reducing agent, water, sodium silicate and recycled coarse aggregate to the dry mix in sequence, mix well, and obtain slurry; shape the slurry, demold it, and cure it at 30°C and 85% humidity for 28 days to obtain all-solid waste self-excited concrete.

[0054] The preparation method of the activated coal gangue powder comprises the following steps: heating the coal gangue powder to 720°C at a heating rate of 12°C / min for calcining for 4 hours, and grinding to obtain the activated coal gangue powder with a particle size of 40 μm.

[0055] The particle size of the iron tailings sand is 1.5 mm; the particle size of the recycled coarse aggregate is 8 mm; and the particle size of the desulfurized ash is 50 μm.

[0056] Comparative Example 5 This comparative example provides a self-excited concrete made of all solid waste, which differs from Example 1 in that the activated coal gangue powder is replaced with an equal amount of fly ash, and specifically includes the following contents: The all-solid waste self-stimulating concrete includes the following raw material components by weight: 950g recycled coarse aggregate, 800g iron tailings sand, 90g fly ash, 220g S95 grade slag, 200g desulfurized ash, 100g sodium silicate, 15g polycarboxylate water reducer, 19g mud inhibitor and 200g water; The method for preparing all-solid waste self-excited concrete comprises the following steps: Step 1: dissolve 10 g of hexadecanol, 40 g of polyoxyethylene ether and 3 g of sodium hydroxide in 35 mL of deionized water, and perform hydrothermal reaction at 94° C. for 40 min to obtain a first mixed material; Step 2: Evenly mix the first mixed material and 1 g of the iron-based catalyst, and perform an activation reaction at 210° C. to obtain a second mixed material; Step 3: Add 35 g of a 30 wt% hexadecylamine ethanol solution to the second mixture, and perform a hydrothermal reaction at 97° C. for 2 h under an inert atmosphere to obtain a mud inhibitor; Step 4: weigh the raw materials of each component according to the designed ratio, and mix the fly ash, S95 grade ore powder, desulfurization ash, iron tailings sand and mud inhibitor evenly to obtain a dry mix; Step 5: Add polycarboxylate water-reducing agent, water, sodium silicate and recycled coarse aggregate to the dry mix in sequence, mix well, and obtain slurry; shape the slurry, demold it, and cure it at 30° C. and a humidity of 85% for 28 days to obtain all-solid waste self-excited concrete.

[0057] The preparation method of the activated coal gangue powder comprises the following steps: heating the coal gangue powder to 720°C at a heating rate of 12°C / min for calcining for 4 hours, and grinding to obtain the activated coal gangue powder with a particle size of 40 μm.

[0058] The particle size of the iron tailings sand is 1.5 mm; the particle size of the recycled coarse aggregate is 8 mm; and the particle size of the desulfurized ash is 50 μm.

[0059] Comparative Example 6 This comparative example provides a self-excited concrete made of all solid waste, which is different from Example 1 in that the desulfurized ash is replaced with an equal amount of phosphogypsum, and specifically includes the following contents: The all-solid waste self-stimulated concrete includes the following raw material components by weight: 950g recycled coarse aggregate, 800g iron tailings sand, 90g activated coal gangue powder, 220g S95 grade mineral powder, 200g phosphogypsum, 100g sodium silicate, 15g polycarboxylate water reducer, 19g mud inhibitor and 200g water; The method for preparing all-solid waste self-excited concrete comprises the following steps: Step 1: dissolve 10 g of hexadecanol, 40 g of polyoxyethylene ether and 3 g of sodium hydroxide in 35 mL of deionized water, and perform hydrothermal reaction at 94° C. for 40 min to obtain a first mixed material; Step 2: Evenly mix the first mixed material and 1 g of the iron-based catalyst, and perform an activation reaction at 210° C. to obtain a second mixed material; Step 3: Add 35 g of a 30 wt% hexadecylamine ethanol solution to the second mixture, and perform a hydrothermal reaction at 97° C. for 2 h under an inert atmosphere to obtain a mud inhibitor; Step 4: weigh the raw materials of each component according to the designed ratio, and evenly mix the activated coal gangue powder, S95 grade ore powder, phosphogypsum, iron tailings sand and mud inhibitor to obtain a dry mix; Step 5: Add polycarboxylate water-reducing agent, water, sodium silicate and recycled coarse aggregate to the dry mix in sequence, mix well, and obtain slurry; shape the slurry, demold it, and cure it at 30° C. and a humidity of 85% for 28 days to obtain all-solid waste self-excited concrete.

[0060] The preparation method of the activated coal gangue powder comprises the following steps: heating the coal gangue powder to 720°C at a heating rate of 12°C / min for calcining for 4 hours, and grinding to obtain the activated coal gangue powder with a particle size of 40 μm.

[0061] The particle size of the iron tailings sand is 1.5 mm; the particle size of the recycled coarse aggregate is 8 mm; and the particle size of the desulfurized ash is 50 μm.

[0062] In order to further reflect the technical effect of the present invention, the present invention conducted relevant performance tests on the all-solid waste self-excited concrete obtained in Examples 1-3 and Comparative Examples 1-6, specifically including the following contents: referring to the standard GB / T 50080-2016 "Standard Test Method for Performance of Ordinary Concrete Mixtures" for slurry fluidity test, referring to the standard GB / T 50081-2019 "Standard Test Method for Physical and Mechanical Properties of Concrete" for compressive strength test, and the test results are shown in Table 1.

[0063] Table 1 Test results of flow properties of all-solid waste self-stimulated concrete obtained from Examples 1-3 and Comparative Examples 1-6

[0064] Table 2 Test results of flow properties of all-solid waste self-stimulated concrete obtained from Examples 1-3 and Comparative Examples 1-6

[0065] It can be seen from Table 1 and Table 2 that the fluidity and 28d compressive strength of the all-solid waste self-excited concrete described in Examples 1-3 of the present invention are more excellent, especially the all-solid waste self-excited concrete described in Example 1 can still maintain a fluidity of 490mm after 24 hours, a 3d compressive strength of up to 28.5MPa, a 7d compressive strength of up to 39.3MPa, and a 28d compressive strength of up to 55.2MPa.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-excited concrete made of all solid waste, characterized by: The invention comprises the following raw material components in parts by weight: 900-1000 parts of recycled coarse aggregate, 750-800 parts of iron tailings sand, 80-120 parts of activated coal gangue powder, 160-240 parts of mineral powder, 190-230 parts of desulfurized ash, 85-105 parts of alkali activator, 14-16 parts of water reducer, 17-20 parts of mud inhibitor and 190-210 parts of water; Wherein, the raw material components of the mud inhibitor include C 12 -C 18 of fatty alcohols, polyoxyethylene ethers and hexadecylamine.

2. The all-solid waste self-excited concrete according to claim 1, characterized in that: The preparation method of the mud inhibitor comprises the following steps: Step a, dissolving fatty alcohol, polyoxyethylene ether and strong base in deionized water, and performing hydrothermal reaction at 90° C.-95° C. to obtain a first mixed material; Step b, uniformly mixing the first mixed material and the metal catalyst, and performing an activation reaction at 200° C.-220° C. to obtain a second mixed material; Step c: adding an alcohol solution of hexadecylamine to the second mixture, and carrying out a hydrothermal reaction at 96° C.-98° C. in an inert atmosphere to obtain a mud inhibitor.

3. The all-solid waste self-excited concrete according to claim 2, characterized in that: In step a, the mass ratio of the fatty alcohol, polyoxyethylene ether and strong base is 1:3:0.2-1.2:4:0.4; and / or In step a, the mass volume ratio of the fatty alcohol to deionized water is 1g:3mL-1g:4mL; and / or In step a, the hydrothermal reaction time is 40 min-60 min.

4. The all-solid waste self-excited concrete according to claim 2, characterized in that: In step b, the metal catalyst is an iron-based catalyst or a cobalt-based catalyst; and / or In step b, the mass ratio of the first mixed material to the metal catalyst is 1:0.01-1:0.03; and / or In step b, the activation reaction time is 2.5h-3.5h.

5. The all-solid waste self-excited concrete according to claim 2, characterized in that: In step c, the mass percentage of hexadecylamine in the alcohol solution of hexadecylamine is 25%-35%; the solvent of the alcohol solution of hexadecylamine is anhydrous ethanol; and / or In step c, the mass ratio of the second mixed material to the alcohol solution of hexadecylamine is 2:1-2.2:1; and / or In step c, the hydrothermal reaction time is 1.5h-2.5h.

6. The all-solid waste self-excited concrete according to claim 1, characterized in that: The preparation method of the activated coal gangue powder comprises the following steps: calcining the coal gangue powder at 700° C.-750° C. and grinding the coal gangue powder to obtain the activated coal gangue powder.

7. The all-solid waste self-excited concrete according to claim 6, characterized in that: Heating to 700°C-750°C at a heating rate of 10°C / min-15°C / min; and / or The calcination time is 3h-5h; and / or The particle size of the activated coal gangue powder is 10 μm-50 μm.

8. The all-solid waste self-excited concrete according to claim 1, characterized in that: The alkali activator is sodium silicate or slaked lime; and / or The water reducer is a polycarboxylate water reducer; and / or The mineral powder is of S95 grade or S105 grade; and / or The particle size of the iron tailings is 0.1 mm to 4.25 mm; and / or The particle size of the recycled coarse aggregate is 5mm-16mm; and / or The particle size of the desulfurized ash is 10 μm-75 μm.

9. A method for preparing all-solid waste self-excited concrete according to any one of claims 1 to 8, characterized in that: The steps include: Step 1, weighing the raw materials of each component according to the designed ratio, and evenly mixing the activated coal gangue powder, mineral powder, desulfurization ash, iron tailings sand and mud inhibitor to obtain a dry mix; Step 2: Add water reducing agent, water, alkali activator and recycled coarse aggregate to the dry mix in sequence, mix evenly to obtain slurry; shape, demould and cure the slurry to obtain all-solid waste self-activated concrete.

10. Use of the all-solid waste self-exciting concrete as described in any one of claims 1 to 8 or the all-solid waste self-exciting concrete prepared by the preparation method of all-solid waste self-exciting concrete as described in claim 9 in the field of building materials.

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