Composite material using coal gangue, preparation method and application of composite material in check dam

Abstract

The invention relates to the technical field of coal gangue materials, in particular to a composite material utilizing coal gangue, a preparation method and application of the composite material in check dam, and the preparation method comprises the following steps: uniformly mixing raw materials at the mixing rotating speed of 550-750r / min for 1 hour to obtain the composite material utilizing the coal gangue. According to the composite material utilizing the coal gangue, the Portland cement, the aggregate, the aggregate and the water reducing agent are mutually blended, meanwhile, the modified coal gangue agent and the modified calcium sulfate whisker agent are added for mutual coordination and joint synergism, and the prepared composite material product has excellent mechanical strength, abrasion resistance and permeability resistance; and the product has remarkable freeze-thaw resistance and acid and alkali resistance stability effects.

Description

TECHNICAL FIELD

[0001] The present application relates to coal gangue material technical field, specifically relates to a kind of composite material using coal gangue, preparation method and its application in check dam. BACKGROUND

[0002] Check dam is the core engineering facilities of mountainous small watershed soil and water conservation, main function is to intercept slope runoff, silt, raise ditch bed, prevent gully erosion, while it can improve local ecological environment, increase cultivated land area.The existing coal gangue material is applied in check dam, poor mechanical strength, poor resistance to impact and abrasion, poor product impermeability, and low product freeze-thaw resistance, acid and alkali resistance stability, further limit the use efficiency of product, based on this, the present application provides a kind of composite material using coal gangue, preparation method and its application in check dam. SUMMARY

[0003] In view of the defects of the prior art, the purpose of the present application is to provide a kind of composite material using coal gangue, preparation method and its application in check dam, to solve the problems raised in the above background.

[0004] The technical problem solved by the present application adopts the following technical scheme: The present application provides a kind of preparation method of composite material using coal gangue, comprising the following steps: Step one, according to the weight part of raw material: Portland cement 35-40 parts, modified coal gangue agent 10-15 parts, modified calcium sulfate whisker agent 7-11 parts, aggregate 8-12 parts, aggregate 6-9 parts, water reducing agent 3-6 parts, water 25-30 parts; Step two, the above raw materials are uniformly mixed, the mixing speed is 550-750r / min, and the mixing time is 1h, to obtain the composite material using coal gangue of the present application.

[0005] Preferably, the aggregate is fine stone, and the particle size is 4-7mm;The aggregate is river sand, and the particle size is 2-5mm;The water reducing agent is polycarboxylic acid water reducing agent;Portland cement is 42.5R type ordinary Portland cement.

[0006] Preferably, the preparation method of the modified coal gangue agent is: S01: preparation of doped nano titanium dioxide treatment solution: S01a: aluminum ester coupling agent DL 411, ethanol solvent and urea solution are uniformly blended according to the weight ratio (3-5):7:(2-4), to obtain the matrix liquid; S01b: blend tetrabutyl titanate, nano-titanium dioxide and nano-calcium carbonate according to weight ratio (3-5):2:(2-3) uniformly to obtain an additive, blend the additive and the base liquid according to weight ratio 3:(7-9) uniformly to obtain a treatment liquid doped with nano-titanium dioxide; S02: wash the coal gangue in a sufficient amount of a 10% mass fraction sulfuric acid solution for 1h, the washing rotation speed is 150-200r / min, after the washing is completed, perform suction filtration and drying; stir and treat the dried coal gangue and the treatment liquid doped with nano-titanium dioxide according to weight ratio 5:(8-11), after the stirring is completed, perform suction filtration and drying to obtain a treated coal gangue body; S03: ball mill the treated coal gangue body and the modifier according to weight ratio 7:(4-6), the ball milling rotation speed is 1000-1500r / min, the ball milling is performed for 2h, after the ball milling is completed, perform suction filtration and drying to obtain a modified coal gangue agent.

[0007] The modified coal gangue agent uses coal gangue to remove surface impurities through acid treatment and activates the coal gangue to optimize the interface bonding basis, and at the same time, the treatment liquid doped with nano-titanium dioxide is improved through treatment, the treatment liquid doped with nano-titanium dioxide is mutually adjusted and matched with the additive and the base liquid, and the base liquid is prepared by combining aluminic ester coupling agent DL 411, ethanol solvent and urea solution, the core function of the aluminic ester coupling agent DL 411 is to "bridge coal gangue and other substrates", the molecular structure thereof contains "inorganic end" (which can be combined with the hydroxyl (-OH) on the surface of the coal gangue) and "organic / inorganic active end" (which can be combined with cement, aggregate and subsequent modifiers), solves the problems of "surface inertness of coal gangue and weak interface bonding with cement", the urea solution adjusts the pH of the treatment liquid to weak alkalinity, on the one hand, enhances the reaction activity of the aluminic ester coupling agent (promotes the combination of the aluminic ester coupling agent with the hydroxyl of the coal gangue); on the other hand, the amino group of the urea can act on the surface active sites of the coal gangue, further improves the treatment stability of the treatment liquid; Meanwhile, the tetrabutyl titanate, nano-titanium dioxide and nano-calcium carbonate in the additive are mutually adjusted and matched, are improved through the mutual matching of raw materials and are supplemented into the system, further enhancing the performance coordination and performance stability of the product.

[0008] Preferably, the stirring rotation speed of the stirring treatment in S02 is 450-500r / min, and the stirring is performed for 1h; the mass fraction of the urea solution is 2-5%.

[0009] Preferably, the preparation method of the modifier is as follows: add 3-5 parts of epi-didymite, 2-4 parts of glass fiber into 5-8 parts of Tris-HCL buffer solution with pH value of 8.5, then add 2-3 parts of dopamine hydrochloride and 2-3 parts of mullite powder, and stir uniformly to obtain the modifier.

[0010] The modified lithium feldspar solution, mullite powder and dopamine hydrochloride solution in the modifier, by the co-configuration between raw materials, the modified modifier further enhances the performance coordination and performance stability of the product in the system; Lithium feldspar is a natural low-expansion mineral (thermal expansion coefficient is only 2.5×10⁻ 6 / ℃), which can reduce the thermal expansion and contraction rate of coal gangue. The check dam in the mountainous area is prone to experience "freeze-thaw cycle" in winter (water in the material inside the ice expands → thawing shrinkage), lithium feldspar can inhibit this volume deformation, avoid the freeze-thaw of the composite material to produce micro-cracks, improve the winter stability of the check dam, the glass fiber is dispersed in the form of fiber, which can be uniformly coated on the surface of coal gangue and embedded in the pores after ball milling, which can build a "mechanical support network" for coal gangue, effectively disperse stress and inhibit the expansion of internal micro-cracks, greatly improve the bending strength and impact resistance of the composite material (adapt to the needs of check dam to withstand slope runoff impact and sediment accumulation pressure), and the mullite powder has excellent stability, high hardness (Mohs hardness 6-7), acid and alkali resistant inorganic mineral, which can assist the co-configuration between raw materials, and the modified modifier can enhance the performance coordination and performance stability of the product in the system.

[0011] Preferably, the preparation method of the modified calcium sulfate whisker agent is: S01: Stir the calcium sulfate whisker in a sufficient amount of 10% mass fraction potassium permanganate solution, then wash with water, filter and dry, and preheat the dried calcium sulfate whisker at 55-60℃ for 1h to obtain pretreated calcium sulfate whisker; S02: Ultrasonic treatment of the pretreated calcium sulfate whisker and the added modification liquid according to the weight ratio of 5: (11-13), after ultrasonic treatment, filter and dry to obtain the modified calcium sulfate whisker agent.

[0012] Preferably, the ultrasonic power for ultrasonic treatment is 350-400W, and the ultrasonic treatment time is 1-2h.

[0013] Preferably, the preparation method of the added modification liquid is: Blend 3-5 parts of cordierite, 2-4 parts of metakaolin, 1-3 parts of silane coupling agent KH560, 5-8 parts of 75-80% mass fraction ethanol solution and 2-3 parts of boron nitride uniformly to obtain the added modification liquid.

[0014] The modified calcium sulfate whisker agent adopts the whisker structure of calcium sulfate whisker as the matrix, which can be dispersed in the matrix to support effect, and better cooperate with the modified coal gangue agent to further enhance the performance effect of the product system. The added modification liquid adopts cordierite, metakaolin and boron nitride to coordinate, and then the interface is modified by silane coupling agent KH560 and 75-80% mass fraction ethanol solution to optimize the functional effect of the product. The filling effect of the metakaolin, the sheet barrier of the boron nitride, the dense distribution of the whisker and the joint synergies of the cordierite jointly reduce the internal porosity of the composite material, effectively prevent the slope runoff from penetrating into the valley groove, reinforce the system inside the valley groove and further reinforce the system structure, and the synergistic effect of the modified coal gangue agent is enhanced, so that the performance effect of the product is further enhanced.

[0015] The application further provides the composite material of coal gangue prepared by the preparation method of the composite material of coal gangue.

[0016] The application further provides application of the preparation method of the composite material of coal gangue in a valley groove.

[0017] Compared with the prior art, the application has the following beneficial effects: The composite material of coal gangue of the application adopts silicate cement, aggregate, aggregate, water reducing agent, modified coal gangue agent and modified calcium sulfate whisker agent, and has excellent mechanical strength, impact resistance and permeability resistance, and the effects of anti-freezing and thawing, acid and alkali resistance and stability are remarkable. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the application are clearly and completely described below in combination with specific embodiments. Obviously, the described embodiments are only some of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0019] The preparation method of the composite material of coal gangue comprises the following steps: Step one, the raw materials are weighed according to the weight parts: 35-40 parts of silicate cement, 10-15 parts of modified coal gangue agent, 7-11 parts of modified calcium sulfate whisker agent, 8-12 parts of aggregate, 6-9 parts of aggregate, 3-6 parts of water reducing agent, and 25-30 parts of water; Step two, the above raw materials are uniformly mixed, the mixing speed is 550-750 r / min, and the mixing time is 1 h, so that the composite material of coal gangue of the application is obtained.

[0020] The aggregate of the embodiment is fine stone with a particle size of 4-7 mm; the aggregate is river sand with a particle size of 2-5 mm; the water reducing agent is a polycarboxylic acid water reducing agent; and the silicate cement is 42.5R type ordinary silicate cement.

[0021] The preparation method of the modified coal gangue agent of the embodiment is as follows: S01: Preparation of a treatment liquid doped with nano titanium dioxide S01a: blend aluminate coupling agent DL 411, ethanol solvent and urea solution uniformly according to weight ratio (3-5):7:(2-4), to obtain a base liquid; S01b: blend tetrabutyl titanate, nano titanium dioxide and nano calcium carbonate uniformly according to weight ratio (3-5):2:(2-3), to obtain an additive, blend the additive and the base liquid uniformly according to weight ratio 3:(7-9), to obtain a treatment liquid doped with nano titanium dioxide; S02: wash the coal gangue in a sufficient amount of 10% sulfuric acid solution for 1h, the washing rotation speed is 150-200r / min, after washing, perform suction filtration and drying; blend the dried coal gangue and the treatment liquid doped with nano titanium dioxide according to weight ratio 5:(8-11), after blending, perform suction filtration and drying, to obtain a treated coal gangue body; S03: ball mill the treated coal gangue body and the modifier according to weight ratio 7:(4-6), the ball milling rotation speed is 1000-1500r / min, ball mill for 2h, after ball milling, perform suction filtration and drying, to obtain a modified coal gangue agent.

[0022] In S02 of this embodiment, the blending rotation speed is 450-500r / min, and the blending time is 1h; the mass fraction of the urea solution is 2-5%.

[0023] The preparation method of the modifier in this embodiment is as follows: add 3-5 parts of petalite, 2-4 parts of glass fiber to 5-8 parts of Tris-HCL buffer solution with pH value of 8.5, then add 2-3 parts of dopamine hydrochloride and 2-3 parts of mullite powder, and blend uniformly, to obtain the modifier.

[0024] The preparation method of the modified calcium sulfate whisker agent in this embodiment is as follows: S01: blend the calcium sulfate whisker in a sufficient amount of 10% potassium permanganate solution, and then perform water washing, suction filtration and drying, preheat the dried calcium sulfate whisker at 55-60℃ for 1h, to obtain pretreated calcium sulfate whisker; S02: ultrasonically treat the pretreated calcium sulfate whisker and the added modification liquid according to weight ratio 5:(11-13), after ultrasonic treatment, perform suction filtration and drying, to obtain the modified calcium sulfate whisker agent.

[0025] In this embodiment, the ultrasonic power is 350-400W, and the ultrasonic treatment time is 1-2h.

[0026] The preparation method of the added modification liquid in this embodiment is as follows: The modified liquid is obtained by uniformly blending 3-5 parts of cordierite, 2-4 parts of metakaolin, 1-3 parts of silane coupling agent KH560, 5-8 parts of 75-80% ethanol solution by mass fraction, and 2-3 parts of boron nitride.

[0027] The coal gangue composite material is prepared by the preparation method of the coal gangue composite material.

[0028] The preparation method of the coal gangue composite material is applied in the valley.

[0029] Embodiment 1. The preparation method of the coal gangue composite material comprises the following steps: Step one, the raw materials are weighed according to the weight parts: 35 parts of Portland cement, 10 parts of modified coal gangue agent, 7 parts of modified calcium sulfate whisker agent, 8 parts of aggregate, 6 parts of aggregate, 3 parts of water reducing agent, and 25 parts of water; Step two, uniformly mix the above raw materials, the mixing speed is 550r / min, and the mixing time is 1h, to obtain the coal gangue composite material.

[0030] The aggregate of the embodiment is fine stone with a particle size of 4mm; the aggregate is river sand with a particle size of 2mm; the water reducing agent is a polycarboxylic acid water reducing agent; and the Portland cement is a 42.5R type ordinary Portland cement.

[0031] The preparation method of the modified coal gangue agent of the embodiment is as follows: S01: preparation of a treatment liquid doped with nano-titanium dioxide: S01a: uniformly blend aluminic ester coupling agent DL 411, ethanol solvent and urea solution according to a weight ratio of 3:7:2 to obtain a base liquid; S01b: uniformly blend tetrabutyl titanate, nano-titanium dioxide and nano-calcium carbonate according to a weight ratio of 3:2:2 to obtain an additive, uniformly stir the additive and the base liquid according to a weight ratio of 3:7 to obtain a treatment liquid doped with nano-titanium dioxide; S02: the coal gangue is washed in a sufficient amount of 10% sulfuric acid solution for 1h, the washing speed is 150r / min, after washing, the coal gangue is filtered and dried; The dried coal gangue and the treatment liquid doped with nano-titanium dioxide are stirred according to a weight ratio of 5:8, after stirring, the coal gangue is filtered and dried to obtain a treated coal gangue body; S03: the treated coal gangue body and the modifier are ball milled according to a weight ratio of 7:4, the ball milling speed is 1000r / min, the ball milling time is 2h, after ball milling, the coal gangue is filtered and dried to obtain a modified coal gangue agent.

[0032] The stirring speed of the stirring treatment in S02 of the embodiment is 450 r / min, and the stirring time is 1 h; the mass fraction of the urea solution is 2%.

[0033] The preparation method of the modifier of the embodiment is as follows: 3 parts of epi-dope, 2 parts of glass fiber are added into 5 parts of Tris-HCL buffer solution with pH value of 8.5, then 2 parts of dopamine hydrochloride and 2 parts of mullite powder are added, and stirring is performed until uniformity is achieved, to obtain the modifier.

[0034] The preparation method of the modified calcium sulfate whisker agent of the embodiment is as follows: S01: calcium sulfate whiskers are sufficiently stirred in a sufficient amount of 10% mass fraction potassium permanganate solution, and then washed with water, filtered, and dried; the dried calcium sulfate whiskers are preheated at 55℃ for 1 h to obtain pretreated calcium sulfate whiskers; S02: the pretreated calcium sulfate whiskers and the added modification liquid are ultrasonically treated according to a weight ratio of 5:11; after ultrasonic treatment, filtration, and drying, a modified calcium sulfate whisker agent is obtained.

[0035] The ultrasonic power of the ultrasonic treatment of the embodiment is 350 W, and the ultrasonic treatment time is 1 h.

[0036] The preparation method of the added modification liquid of the embodiment is as follows: 3 parts of epi-dope, 2 parts of glass fiber are added into 5 parts of Tris-HCL buffer solution with pH value of 8.5, then 2 parts of dopamine hydrochloride and 2 parts of mullite powder are added, and stirring is performed until uniformity is achieved, to obtain the modifier.

[0037] The coal gangue composite material prepared by the preparation method of the composite material using coal gangue of the embodiment.

[0038] The application of the preparation method of the composite material using coal gangue of the embodiment in a valley barn. The preparation method of the composite material using coal gangue of the embodiment comprises the following steps: Step one, the raw materials are weighed according to the weight parts: 40 parts of Portland cement, 15 parts of modified coal gangue agent, 11 parts of modified calcium sulfate whisker agent, 12 parts of aggregate, 9 parts of aggregate, 6 parts of water reducing agent, and 30 parts of water; Step two, the above raw materials are uniformly mixed at a mixing speed of 750 r / min for 1 h, to obtain the composite material using coal gangue of the embodiment.

[0039] The aggregate of the embodiment is fine stone with a particle size of 7 mm; the aggregate is river sand with a particle size of 5 mm; the water reducing agent is a polycarboxylic acid water reducing agent; and the Portland cement is a 42.5R type ordinary Portland cement.

[0040] The preparation method of the modified coal gangue agent of the embodiment is as follows: S01: Preparation of a treatment liquid doped with nano-titanium dioxide: S01a: Aluminic acid ester coupling agent DL 411, ethanol solvent and urea solution were uniformly blended according to a weight ratio of 5:7:4 to obtain a base liquid; S01b: Tetrabutyl titanate, nano-titanium dioxide and nano-calcium carbonate were uniformly blended according to a weight ratio of 5:2:3 to obtain an additive, the additive and the base liquid were uniformly stirred according to a weight ratio of 3:9 to obtain a treatment liquid doped with nano-titanium dioxide; S02: The coal gangue was washed in a sufficient amount of a 10% sulfuric acid solution for 1 h at a washing rotation speed of 200 r / min, and after the washing was completed, the coal gangue was subjected to suction filtration and drying; The dried coal gangue and the treatment liquid doped with nano-titanium dioxide were stirred according to a weight ratio of 5:11, and after the stirring was completed, the coal gangue was subjected to suction filtration and drying to obtain a treated coal gangue body; S03: The treated coal gangue body and a modifier were subjected to ball milling according to a weight ratio of 7:6 at a ball milling rotation speed of 1500 r / min for 2 h, and after the ball milling was completed, the coal gangue was subjected to suction filtration and drying to obtain a modified coal gangue agent.

[0041] In S02 of this embodiment, the stirring rotation speed was 500 r / min, and the stirring was performed for 1 h; the mass fraction of the urea solution was 5%.

[0042] The preparation method of the modifier in this embodiment was as follows: Five parts of epi-didymite, four parts of glass fiber and eight parts of a Tris-HCL buffer solution with a pH value of 8.5 were added, followed by the addition of three parts of dopamine hydrochloride and three parts of mullite powder, and the mixture was stirred uniformly to obtain the modifier.

[0043] The preparation method of the modified calcium sulfate whisker agent in this embodiment was as follows: S01: Calcium sulfate whiskers were sufficiently stirred in a sufficient amount of a 10% potassium permanganate solution, and then subjected to water washing, suction filtration and drying; the dried calcium sulfate whiskers were preheated at 60°C for 1 h to obtain pretreated calcium sulfate whiskers; S02: The pretreated calcium sulfate whiskers and an added modification liquid were ultrasonically treated according to a weight ratio of 5:13, and after the ultrasonic treatment was completed, the calcium sulfate whiskers were subjected to suction filtration and drying to obtain a modified calcium sulfate whisker agent.

[0044] In the ultrasonic treatment in this embodiment, the ultrasonic power was 400 W, and the ultrasonic treatment was performed for 2 h.

[0045] The preparation method of the added modification liquid in this embodiment was as follows: Five parts of epi-didymite, four parts of metakaolin, three parts of silane coupling agent KH560, eight parts of an ethanol solution with a mass fraction of 80% and three parts of boron nitride were uniformly blended to obtain the added modification liquid.

[0046] The coal gangue composite material prepared by the preparation method of the coal gangue composite material of the embodiment.

[0047] The application of the preparation method of the coal gangue composite material of the embodiment in a check dam. The preparation method of the coal gangue composite material of the embodiment comprises the following steps: Step one, the raw materials are weighed according to the weight parts: 37.5 parts of Portland cement, 12.5 parts of modified coal gangue agent, 9 parts of modified calcium sulfate whisker agent, 10 parts of aggregate, 7.5 parts of aggregate, 4.5 parts of water reducing agent, and 27.5 parts of water; Step two, the above raw materials are uniformly mixed, the mixing speed is 550-750 r / min, and the mixing time is 1 h, so that the coal gangue composite material of the embodiment is obtained.

[0048] The aggregate of the embodiment is fine stone with a particle size of 5.5 mm; the aggregate is river sand with a particle size of 3.5 mm; the water reducing agent is a polycarboxylic acid water reducing agent; and the Portland cement is a 42.5R type ordinary Portland cement.

[0049] The preparation method of the modified coal gangue agent of the embodiment is as follows: S01: preparation of a treatment liquid doped with nano-titanium dioxide: S01a: uniformly blend aluminum ester coupling agent DL 411, ethanol solvent and urea solution according to a weight ratio of 4:7:3 to obtain a base liquid; S01b: uniformly blend tetrabutyl titanate, nano-titanium dioxide and nano-calcium carbonate according to a weight ratio of 4:2:2.5 to obtain an additive, uniformly stir the additive and the base liquid according to a weight ratio of 3:8 to obtain the treatment liquid doped with nano-titanium dioxide; S02: wash the coal gangue in a sufficient amount of 10% sulfuric acid solution for 1 h, the washing speed is 170 r / min, after the washing is completed, perform suction filtration and drying; stir the dried coal gangue and the treatment liquid doped with nano-titanium dioxide according to a weight ratio of 5:9.5, after the stirring is completed, perform suction filtration and drying to obtain a treated coal gangue body; S03: ball mill the treated coal gangue body and the modifier according to a weight ratio of 7:5, the ball milling speed is 1250 r / min, the ball milling time is 2 h, after the ball milling is completed, perform suction filtration and drying to obtain the modified coal gangue agent.

[0050] In the embodiment, the stirring speed in the stirring process in S02 is 470 r / min, and the stirring time is 1 h; the mass fraction of the urea solution is 3.5%.

[0051] The preparation method of the modifier of the embodiment is as follows: 4 parts of petalite, 3 parts of glass fiber are added into 6.5 parts of Tris-HCL buffer solution with pH value of 8.5, then 2.5 parts of dopamine hydrochloride and 2.5 parts of mullite powder are added, and stirring is performed to obtain a modifier.

[0052] The preparation method of the modified calcium sulfate whisker agent in the embodiment is as follows: S01: calcium sulfate whiskers are stirred in a sufficient amount of 10% potassium permanganate solution, then washed with water, filtered, and dried, and the dried calcium sulfate whiskers are preheated at 57.5°C for 1h to obtain pretreated calcium sulfate whiskers; S02: the pretreated calcium sulfate whiskers and the modification liquid are ultrasonically treated according to a weight ratio of 5:12, the ultrasonic treatment is stopped, and the mixture is filtered and dried to obtain a modified calcium sulfate whisker agent.

[0053] The ultrasonic treatment in the embodiment is performed at an ultrasonic power of 350-400W for 1-2h.

[0054] The preparation method of the modification liquid in the embodiment is as follows: 4 parts of coesite, 3 parts of metakaolin, 2 parts of silane coupling agent KH560, 6.5 parts of 78% ethanol solution, and 2.5 parts of boron nitride are uniformly blended to obtain a modification liquid.

[0055] The coal gangue composite material in the embodiment is prepared by the preparation method of the composite material using coal gangue.

[0056] The application of the preparation method of the composite material using coal gangue in the valley in the embodiment. Different from example 3 is that no modified coal gangue agent is added.

[0057] Comparative example 2. Different from example 3 is that no treatment liquid doped with nano titanium dioxide is added in the preparation of the modified coal gangue agent.

[0058] Comparative example 3. Different from example 3 is that no additive is added in the preparation of the treatment liquid doped with nano titanium dioxide.

[0059] Comparative example 4. Different from example 3 is that no nano titanium dioxide and nano calcium carbonate are added in the additive.

[0060] Comparative example 5. Different from example 3 is that no modifier is added in the preparation of the modified coal gangue agent.

[0061] Comparative example 6. Different from example 3 is that no petalite and glass fiber are added in the modifier.

[0062] Comparative Example 7. The difference from Example 3 is that no dopamine hydrochloride and no mullite powder are added in the modifier.

[0063] Comparative Example 8. The difference from Example 3 is that no modified calcium sulfate whisker agent is added.

[0064] Comparative Example 9. The difference from Example 3 is that no additive modification liquid is added in the preparation of the modified calcium sulfate whisker agent.

[0065] Comparative Example 10. The difference from Example 3 is that no coesite and no metakaolin are added in the additive modification liquid.

[0066] Comparative Example 11. The difference from Example 3 is that no boron nitride and no silane coupling agent KH560 are added in the additive modification liquid.

[0067] The products of Examples 1-3 and Comparative Examples 1-11 are tested for mechanical strength, impact resistance (impact resistance strength test is performed according to “Test Code for Hydraulic Concrete” (DL / T5150 2001) and “Technical Code for Anti-impact and Anti-erosion Concrete of Hydraulic Structures” (DL / T5207 2005)), and impermeability, and the measurement results are as follows: From Examples 1-3 and Comparative Examples 1-11, it is found that the product of Example 3 has excellent mechanical strength, impact resistance, and impermeability performance under conventional conditions, and the performance of the product can be improved in a coordinated manner. When one of no modified coal gangue agent and no modified calcium sulfate whisker agent is added in the product, the performance of the product is significantly deteriorated, and when both of them are used, the performance of the product is most obvious. When no doping nano-titanium dioxide treatment liquid is added in the preparation of the modified coal gangue agent, no additive is added in the preparation of the doping nano-titanium dioxide treatment liquid, no nano-titanium dioxide and no nano-calcium carbonate are added in the additive, no modifier is added in the preparation of the modified coal gangue agent, no eucryptite and no glass fiber are added in the modifier, no dopamine hydrochloride and no mullite powder are added in the modifier, the performance of the product has a deteriorating trend to different degrees, and the modified coal gangue agent prepared by using the doping nano-titanium dioxide treatment liquid obtained by the specific method of the application and the specific modifier has the most obvious performance effect. The modified calcium sulfate whisker agent is prepared without adding a modification liquid, without adding cordierite and metakaolin in the modification liquid, without adding boron nitride and silane coupling agent KH560 in the modification liquid, and the performance of the product also shows a varying degree of deterioration trend, the modified calcium sulfate whisker agent improved by the specific method of the application has the most obvious performance effect, and the preparation of the modification liquid of the application has a specific scheme, the product raw material obtained by the technical scheme of the application has the most obvious performance effect, and other methods cannot replace the technical effect of the application.

[0068] Based on the above tests, the product is also tested for freeze-thaw resistance and acid and alkali stability, and the test results are as follows: As can be seen from Comparative Examples 1-11 and Example 3, the modified coal gangue agent and the modified calcium sulfate whisker agent obtained by the specific method of the application are combined with each other and mutually synergistic, and the product prepared has excellent mechanical strength, impact resistance and permeability resistance, and the product also has remarkable freeze-thaw resistance and acid and alkali stability.

[0069] It is apparent to those skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments, and that the application can be implemented in other particular forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the application should be defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalents of the claims are intended to be embraced therein.

[0070] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment need necessarily contain one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A method for preparing a composite material using coal gangue, characterized by, The method comprises the following steps: Step 1: ingredients are weighed according to weight parts: 35-40 parts of Portland cement, 10-15 parts of modified coal gangue agent, 7-11 parts of modified calcium sulfate whisker agent, 8-12 parts of aggregate, 6-9 parts of aggregate, 3-6 parts of water reducing agent, and 25-30 parts of water; Step 2: the above ingredients are uniformly mixed at a mixing speed of 550-750 r / min for 1 h, to obtain the composite material using coal gangue.

2. The method of claim 1, wherein the coal gangue composite material is prepared by mixing coal gangue, a binder, and a filler. The aggregate is fine stone with a particle size of 4-7 mm; the aggregate is river sand with a particle size of 2-5 mm; the water reducing agent is a polycarboxylic acid water reducing agent; and the Portland cement is a 42.5R type ordinary Portland cement.

3. The method of claim 1, wherein the coal gangue composite material is prepared by mixing coal gangue, a binder, and a filler. The preparation method of the modified coal gangue agent is as follows: S01: preparation of the treatment liquid doped with nano titanium dioxide: S01a: aluminum ester coupling agent DL 411, ethanol solvent and urea solution are uniformly blended according to a weight ratio of (3-5):7:(2-4) to obtain a base liquid; S01b: tetrabutyl titanate, nano titanium dioxide and nano calcium carbonate are uniformly blended according to a weight ratio of (3-5):2:(2-3) to obtain an additive, the additive and the base liquid are uniformly stirred according to a weight ratio of 3:(7-9) to obtain the treatment liquid doped with nano titanium dioxide; S02: the coal gangue is washed in a sufficient amount of a 10% sulfuric acid solution for 1 h at a washing speed of 150-200 r / min, and then is subjected to suction filtration and drying after the washing is completed; the dried coal gangue and the treatment liquid doped with nano titanium dioxide are stirred and treated according to a weight ratio of 5:(8-11), and then are subjected to suction filtration and drying after the stirring is completed, to obtain a treated coal gangue body; S03: the treated coal gangue body and the modifier are ball milled according to a weight ratio of 7:(4-6) at a ball milling speed of 1000-1500 r / min for 2 h, and then are subjected to suction filtration and drying after the ball milling is completed, to obtain the modified coal gangue agent.

4. The method of claim 3, wherein the coal gangue composite material is prepared by mixing coal gangue, a binder, and a filler. The stirring speed of the stirring treatment in S02 is 450-500 r / min, and the stirring time is 1 h; and the mass fraction of the urea solution is 2-5%.

5. The method of claim 3, wherein the coal gangue composite material is prepared by mixing coal gangue, a binder, and a filler. The preparation method of the modifier is as follows: 3-5 parts of epi-didymite, 2-4 parts of glass fiber and 2-3 parts of hydrochloric acid dopamine are added into 5-8 parts of Tris-HCL buffer solution with a pH value of 8.5, and then 2-3 parts of mullite powder is added, and the mixture is uniformly stirred to obtain the modifier.

6. The method of claim 1, wherein the coal gangue composite material is prepared by mixing coal gangue, a binder, and a filler. The preparation method of the modified calcium sulfate whisker agent is as follows: S01: the calcium sulfate whisker is sufficiently stirred in a sufficient amount of a 10% potassium permanganate solution, and then is subjected to water washing, suction filtration and drying, and the dried calcium sulfate whisker is preheated at 55-60°C for 1 h to obtain pre-processed calcium sulfate whisker; S02: the pre-processed calcium sulfate whisker and the added modification liquid are ultrasonically treated according to a weight ratio of 5:(11-13), and then are subjected to suction filtration and drying after the ultrasonic treatment is completed, to obtain the modified calcium sulfate whisker agent.

7. The method of claim 6, wherein the coal gangue composite material is prepared by mixing coal gangue, a binder, and a filler. The ultrasonic power of the ultrasonic treatment is 350-400 W, and the ultrasonic treatment time is 1-2 h.

8. The method of claim 6, wherein the coal gangue composite material is prepared by mixing coal gangue, a binder, and a filler. The preparation method of the added modification liquid is as follows: 3-5 parts of cordierite, 2-4 parts of metakaolin and 1-3 parts of silane coupling agent KH560 and 5-8 parts of 75-80% mass fraction of ethanol solution and 2-3 parts of boron nitride are uniformly blended to obtain an added modified liquid.

9. The coal gangue composite material prepared by the preparation method of the coal gangue composite material according to any one of claims 1-8.

10. The application of the preparation method of the coal gangue composite material according to any one of claims 1-8 in a check dam.

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