Integrated fabricated building module prepared from gold tailing sand and preparation method

Abstract

The invention provides an integrated fabricated building module prepared from gold tailing sand and a preparation method, and belongs to the field of integrated fabricated buildings. The integrated fabricated building module prepared from the gold mine tailing sand is prepared from the following raw material components in parts by weight: 10 to 12 parts of cement, 4 to 6.5 parts of an admixture, 10 to 20 parts of the gold mine tailing sand, 13 to 24 parts of machine-made sand, 41 to 45 parts of stone, 6 to 7.5 parts of water and 0.3 to 0.5 part of a water reducing agent. According to the integrated fabricated building module prepared from the gold mine tailing sand and the preparation method, the gold mine tailing sand can be effectively recycled, and the problems of environmental pollution, serious dust raising, management difficulty and the like caused by the existing gold mine tailing sand are solved.

Description

Technical Field

[0001] The invention relates to the field of integrated assembled buildings, and in particular to an integrated assembled building module prepared by using gold mine tailings sand and a preparation method thereof. Background Art

[0002] Most tailings ponds are in the shape of valleys, hillsides or flat terrains. Most have been covered with soil to create farmland, some are in use, and some are not covered with soil, or are only covered with a thin layer of soil, which can easily cause secondary dust hazards and have a bad impact on the surrounding environment.

[0004] Since gold mine tailings are fine in size and contain mineral processing agents and metal ions, when there is a strong wind, especially in the dry season from March to June, the tailings will be blown into yellow sand and dust, and fall into villages, farmlands, and orchards, causing pollution and damage to the surrounding environment; in the flood season, the tailings will flow into farmlands and rivers together with rainwater, polluting the groundwater. In addition, when dealing with the above problems, it is necessary to arrange relevant personnel for management and maintenance, which requires a lot of manpower and material resources, resulting in economic waste. Tailings pollute the environment, occupy land, damage the landscape, destroy the soil, harm organisms, silt up rivers, and cause great economic losses. Turning tailings into treasure has become an urgent problem to be solved.

[0005] The integrated prefabricated building system is an important development direction of the construction industry in recent years. Through modular and standardized design and centralized prefabrication production methods, it can greatly improve the construction efficiency of buildings, reduce construction costs, and promote the sustainable development of the construction industry. At present, integrated prefabricated buildings have been widely used at home and abroad, especially in residential, hotel, school, hospital, supermarket and other construction fields. With the continuous advancement of integrated prefabricated building system technology, the application scope of integrated prefabricated buildings will be further expanded.

[0006] Integrated prefabricated buildings break the drawbacks of traditional construction operations, such as frequent wet operations, long construction periods, and severe environmental pollution, and have the following technical advantages: 1) Fast construction speed. Since the module units are prefabricated in the factory, only assembly is required on site, which greatly shortens the construction period; 2) Controllable quality. Factory production is conducive to achieving quality standardization and refined management, improving the overall quality of the building; 3) Green, environmentally friendly and energy-saving, reducing on-site wet operations and the generation of construction waste, which is beneficial to environmental protection and energy conservation and emission reduction; 4) Flexible and changeable. The interchangeability and versatility between unit modules make the building design more flexible and changeable, which can meet the needs of different customers.

[0007] Integrated prefabricated building modules refer to the division of different parts or functional units of an integrated prefabricated building into independent unit modules. After these unit modules are prefabricated in the factory, they are transported to the construction site and directly assembled into an integrated prefabricated building. The integrated prefabricated building modules can be divided into wall modules, floor modules, beam and column modules, etc., which constitute the main load-bearing structure of the building. The integrated prefabricated building modules have the characteristics of standardized production and easy and quick assembly. Summary of the invention

[0008] In order to solve the technical problems existing in the prior art, the present invention provides an integrated assembled building module prepared by using gold mine tailings sand and a preparation method, which can effectively reuse the gold mine tailings sand and solve the problems of environmental pollution, severe dust, and difficult management caused by the existing gold mine tailings sand.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: An integrated assembled building module prepared from gold mine tailings sand is composed of the following raw material components by weight: 10-12 parts of cement, 4-6.5 parts of admixture, 10-20 parts of gold mine tailings sand, 13-24 parts of machine-made sand, 41-45 parts of gravel, 6-7.5 parts of water, and 0.3-0.5 parts of water reducer; The particle size of the gold mine tailings sand is in the range of 0.08-0.5 mm; The raw materials of the admixture include: gold mine tailings powder, blast furnace slag, fly ash; The particle size of the gold mine tailings powder is less than 0.08 mm.

[0010] Preferably, among the raw materials of the admixture, the weight ratio of gold mine tailings powder, blast furnace slag and fly ash is 2-4:6-6.5:2-3.

[0011] Preferably, the stone is crushed stone with a particle size range of 5-25 mm, a needle-like content ≤15wt%, a mud content ≤1.0wt%, a mud block content ≤0.5wt%, and a crushing value ≤10wt%; The machine-made sand has a particle size range of 0.25-0.5 mm, a methylene blue value of <1.4 g / kg, and a mud content of ≤0.5 wt%; The water reducing agent has a water reducing rate of ≥14%.

[0012] Preferably, the blast furnace slag is water-quenched granulated blast furnace slag, and the moisture content is ≤1.0wt%; The fly ash is Class I fly ash, with a 0.045 mm sieve residue of ≤30%, a water requirement ratio of ≤105%, and an activity index of ≥70%.

[0013] A method for preparing an integrated assembled building module using gold mine tailings sand, comprising the following steps: pre-treatment, preparation of admixtures, pre-mixing, casting and curing; The pre-treatment method is as follows: drying the gold tailings at a temperature not lower than 105° C. to a moisture content of ≤1.0wt%, and then screening the gold tailings to obtain gold tailings with a particle size of 0.080mm-0.5mm as gold tailings sand; and gold tailings with a particle size less than 0.080mm as gold tailings powder; The premixing method comprises weighing cement, admixture, gold mine tailings sand, machine-made sand, gravel, water, and water reducing agent respectively by weight, putting them into a mixer, and stirring them evenly to obtain a premix; The premix is ​​cast, formed and cured to produce an integrated assembled building module.

[0014] Furthermore, it is characterized in that the method for preparing the admixture is to put gold mine tailings powder, blast furnace slag and fly ash into a grinder according to a weight ratio, control the grinding speed to 20-25rpm, the grinding rate to 18-22t / h, and grind to obtain the admixture.

[0015] Preferably, the admixture has a fineness (0.045 mm sieve residue) of ≤12wt%, a 7d activity index of ≥80%, and a 28d activity index of ≥90%.

[0016] Furthermore, the casting method is to introduce the premix into a molding mold, vibrate and compact it until no bubbles float up, and let it stand to harden and mold, so as to obtain a standard module blank.

[0017] Furthermore, the curing method is to cover the standard module blank obtained by casting with a mold for static curing, and then use a steam curing hood to cover the standard module blank with the mold, introduce steam to raise the temperature to 60-80°C for 3-4 hours, and after heat preservation and steam curing, cool it to room temperature, demold it, and obtain an integrated assembled building module.

[0018] Preferably, during the curing, the film-covering and curing time is 1-2 hours; The curing time of 60-80℃ heat preservation steam is 12-13h; The cooling rate after thermal insulation steam curing shall not exceed 20℃ / h.

[0019] Compared with the prior art, the present invention has the following beneficial effects: (1) The integrated prefabricated building module and preparation method prepared by using gold mine tailings sand of the present invention directly use gold mine tailings sand with a particle size range of 0.08-0.5 mm as the main raw material for the preparation of integrated prefabricated building modules, and combine gold mine tailings powder with a particle size less than 0.08 mm with blast furnace slag and fly ash to prepare an admixture, which is then used for the preparation of integrated prefabricated building modules. The gold mine tailings sand can be effectively reused to prepare concrete products, thereby solving the problems of environmental pollution, severe dust, and difficult management caused by existing gold mine tailings sand.

[0020] (2) The integrated prefabricated building module and preparation method prepared by using gold mine tailings sand of the present invention directly use gold mine tailings sand with a particle size range of 0.08-0.5mm as the main raw material for the preparation of the integrated prefabricated building module, and combine gold mine tailings powder with a particle size less than 0.08mm with blast furnace slag and fly ash to prepare an admixture, which is then used to prepare the integrated prefabricated building module; on the one hand, the gold mine tailings source material (gold mine tailings sand, gold mine tailings powder) directly participates in the hydration reaction of the integrated prefabricated building module, stimulates its gel activity, promotes the formation of gel hydrates, effectively fills the internal pores and defects of the concrete, and refines the pore structure of the concrete; on the other hand, the gold mine tailings source material (gold mine tailings sand, gold mine tailings powder) catalyzes the hydration process through its specific components, thereby further improving the physical properties of the integrated prefabricated building module.

[0021] (3) The integrated prefabricated building module prepared by using gold mine tailings sand of the present invention has a concrete slump of 170 mm ± 10 mm before molding; after molding, the integrated prefabricated building module has a compressive strength of ≥ 35 MPa, a flexural strength of ≥ 4.0 MPa, and a water-resistance grade of > P6. DETAILED DESCRIPTION

[0022] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described.

[0023] Example 1 The present embodiment provides an integrated assembled building module prepared using gold mine tailings sand, which is composed of the following raw material components by weight: 10.4 parts of cement, 5.8 parts of admixture, 20 parts of gold mine tailings sand, 13.7 parts of machine-made sand, 42.4 parts of gravel, 7.3 parts of water, and 0.3 parts of water reducer.

[0024] The cement is ordinary Portland cement of grade P·O 42.5, and the product of Shandong Shanshui Cement Group Co., Ltd. is used in this embodiment.

[0025] The particle size range of gold mine tailings sand is 0.08-0.5mm. It is the tailings waste generated during the gold mining process. The main components of gold mine tailings sand are silicon dioxide and aluminum oxide, with the content of the main components exceeding 85wt%, and it also contains a small amount of potassium oxide, iron oxide, magnesium oxide, etc.

[0026] The gravel is crushed stone with a particle size range of 5-25mm, needle-like content ≤15wt%, mud content ≤1.0wt%, mud block content ≤0.5wt%, and crushing value ≤10wt%.

[0027] The particle size of the machine-made sand is in the range of 0.25-0.5 mm, the methylene blue value is less than 1.4 g / kg, and the mud content is ≤ 0.5 wt%.

[0028] The admixture is prepared by uniformly mixing and grinding gold mine tailings powder, blast furnace slag and fly ash; the weight ratio of the gold mine tailings powder, blast furnace slag and fly ash is 2:6:2.

[0029] The particle size of gold tailings powder is less than 0.08mm. It is the tailings waste generated in the gold mining process. With the particle size of 0.08mm as the limit, gold tailings with a particle size less than 0.08mm are used as gold tailings powder in admixtures.

[0030] The blast furnace slag is water-quenched granulated blast furnace slag, the main components of which are silicon dioxide, aluminum oxide, calcium oxide and magnesium oxide, and the moisture content is ≤1.0wt%.

[0031] The fly ash is Class I fly ash, with a 0.045mm sieve residue ≤30%, a water requirement ratio ≤105%, and an activity index ≥70%.

[0032] The water reducing rate of water reducing agent is ≥14%.

[0033] This embodiment also provides a method for preparing an integrated assembled building module using gold mine tailings sand, specifically: 1. Pre-treatment After the gold tailings are dried at a temperature not lower than 105°C to a moisture content of ≤1.0wt%, they are screened and the gold tailings with a particle size of 0.080mm-0.5mm are screened by a powder concentrator and put into the No. 1 warehouse as gold tailings sand for standby use; the gold tailings with a particle size less than 0.080mm are put into the No. 2 warehouse as gold tailings powder for standby use.

[0034] 2. Preparation of admixtures Gold mine tailings powder, blast furnace slag and fly ash were put into a grinder (Φ2.6m×13m) at a weight ratio of 2:6:2. The grinding speed was controlled to 20rpm and the grinding rate was 18t / h to obtain the admixture.

[0035] The admixture has a fineness (0.045 mm sieve residue) of 11.6 wt %, a 7d activity index of 83%, and a 28d activity index of 91%.

[0036] 3. Premix Cement, admixture, gold mine tailings sand, machine-made sand, gravel, water and water reducing agent are weighed respectively by weight, put into a mixer, and stirred evenly to obtain a premix.

[0037] 4. Casting The premix is ​​transported to the molding workshop by a mixer truck for casting and molding. Specifically, the premix is ​​introduced into the molding mold, vibrated and compacted until no bubbles float up, and left to harden and mold to obtain a standard module blank with predetermined size and specifications.

[0038] The concrete slump of the green body before molding is 160 mm, the compressive strength is 38.2 MPa (verified by a reserved specimen during molding), the flexural strength is 4.2 MPa (verified by a reserved specimen during molding), and the appearance has no honeycomb holes, no cracks, and no exposed reinforcement.

[0039] 5. Maintenance The standard module blank obtained in the casting step is covered with a mold and allowed to stand for 1.5 hours. The standard module blank with the mold is then covered with a steam curing hood, and steam is introduced to raise the temperature to 70°C for 3.5 hours. After heat preservation and steam curing for 12.5 hours, the temperature is cooled to room temperature at a cooling rate of no more than 20°C / h, and the mold is demolded to obtain an integrated assembled building module.

[0040] During the curing process, the steam pressure was controlled at 0.09MPa and the relative humidity was 98%.

[0041] The integrated assembled building module has a compressive strength of 38.2 MPa, a flexural strength of 4.2 MPa, and a water-resistance grade of P7.

[0042] 6. Post-processing After an overall inspection of the integrated prefabricated building modules and repair of possible defects, they are transferred to the finished product area. After passing the quality inspection, they are temporarily stored in the warehouse or transported to the construction site for the construction of the integrated prefabricated building.

[0043] Example 2 The present embodiment provides an integrated assembled building module prepared using gold mine tailings sand, which is composed of the following raw material components by weight: 11.2 parts of cement, 5.4 parts of admixture, 15 parts of gold mine tailings sand, 18.2 parts of machine-made sand, 42.7 parts of gravel, 7.1 parts of water, and 0.4 parts of water reducer.

[0044] The cement is ordinary Portland cement of grade P·O 42.5, and the product of Shandong Shanshui Cement Group Co., Ltd. is used in the embodiments.

[0045] The particle size range of gold mine tailings sand is 0.08-0.5mm. It is the tailings waste generated during the gold mining process. The main components of gold mine tailings sand are silicon dioxide and aluminum oxide, with the content of the main components exceeding 85wt%, and it also contains a small amount of potassium oxide, iron oxide, magnesium oxide, etc.

[0046] The gravel is crushed stone with a particle size range of 5-25mm, needle-like content ≤15wt%, mud content ≤1.0wt%, mud block content ≤0.5wt%, and crushing value ≤10wt%.

[0047] The particle size of the machine-made sand is in the range of 0.25-0.5 mm, the methylene blue value is less than 1.4 g / kg, and the mud content is ≤0.5 wt%.

[0048] The admixture is prepared by uniformly mixing and grinding gold mine tailings powder, blast furnace slag and fly ash; the weight ratio of the gold mine tailings powder, blast furnace slag and fly ash is 3:6.2:2.5.

[0049] The particle size of gold tailings powder is less than 0.08mm. It is the tailings waste generated in the gold mining process. With the particle size of 0.08mm as the limit, gold tailings with a particle size less than 0.08mm are used as gold tailings powder in admixtures.

[0050] The blast furnace slag is water-quenched granulated blast furnace slag, the main components of which are silicon dioxide, aluminum oxide, calcium oxide and magnesium oxide, and the moisture content is ≤1.0wt%.

[0051] The fly ash is Class I fly ash, with a 0.045mm sieve residue ≤30%, a water requirement ratio ≤105%, and an activity index ≥70%.

[0052] The water reducing rate of water reducing agent is ≥14%.

[0053] This embodiment also provides a method for preparing an integrated assembled building module using gold mine tailings sand, specifically: 1. Pre-treatment After the gold tailings are dried at a temperature not lower than 105°C to a moisture content of ≤1.0wt%, they are screened and the gold tailings with a particle size of 0.080mm-0.5mm are screened by a powder concentrator and put into the No. 1 warehouse as gold tailings sand for standby use; the gold tailings with a particle size less than 0.080mm are put into the No. 2 warehouse as gold tailings powder for standby use.

[0054] 2. Preparation of admixtures Gold mine tailings powder, blast furnace slag and fly ash were put into a grinder (Φ2.6m×13m) at a weight ratio of 3:6.2:2.5. The grinding speed was controlled to 22rpm and the grinding rate was 19t / h to obtain the admixture.

[0055] The admixture has a fineness (0.045 mm sieve residue) of 11.2 wt %, a 7d activity index of 84%, and a 28d activity index of 92%.

[0056] 3. Premix Cement, admixture, gold mine tailings sand, machine-made sand, gravel, water and water reducing agent are weighed respectively by weight, put into a mixer, and stirred evenly to obtain a premix.

[0057] 4. Casting The premix is ​​transported to the molding workshop by a mixer truck for casting and molding. Specifically, the premix is ​​introduced into the molding mold, vibrated and compacted until no bubbles float up, and left to harden and mold to obtain a standard module blank with predetermined size and specifications.

[0058] The concrete slump of the green body before molding is 170 mm, the compressive strength is 42.2 (verified by a reserved specimen during molding), the flexural strength is 5.6 MPa (verified by a reserved specimen during molding), and the appearance has no honeycomb holes, cracks, or exposed reinforcement.

[0059] 5. Maintenance The standard module blank obtained in the casting step is covered with a mold and allowed to stand for 1 hour. The standard module blank with the mold is then covered with a steam curing hood, and steam is introduced to raise the temperature to 60°C in 3 hours. After steam curing for 12 hours, the temperature is cooled to room temperature at a cooling rate of no more than 20°C / h, and the mold is demolded to obtain an integrated assembled building module.

[0060] During the curing process, the steam pressure was controlled at 0.08MPa and the relative humidity was 100%.

[0061] The integrated assembled building module has a compressive strength of 42.2 MPa, a flexural strength of 5.6 MPa, and a water-resistance grade of P7.

[0062] 6. Post-processing After an overall inspection of the integrated prefabricated building modules and repair of possible defects, they are transferred to the finished product area. After passing the quality inspection, they are temporarily stored in the warehouse or transported to the construction site for the construction of the integrated prefabricated building.

[0063] Example 3 The present embodiment provides an integrated assembled building module prepared using gold mine tailings sand, which is composed of the following raw material components by weight: 12 parts of cement, 5 parts of admixture, 15 parts of gold mine tailings sand, 18.5 parts of machine-made sand, 42.2 parts of gravel, 6.8 parts of water, and 0.5 parts of water reducer.

[0064] The cement is ordinary Portland cement of grade P·O 42.5, and the product of Shandong Shanshui Cement Group Co., Ltd. is used in the embodiments.

[0065] The particle size range of gold mine tailings sand is 0.08-0.5mm. It is the tailings waste generated during the gold mining process. The main components of gold mine tailings sand are silicon dioxide and aluminum oxide, with the content of the main components exceeding 85wt%, and it also contains a small amount of potassium oxide, iron oxide, magnesium oxide, etc.

[0066] The gravel is crushed stone with a particle size range of 5-25mm, needle-like content ≤15wt%, mud content ≤1.0wt%, mud block content ≤0.5wt%, and crushing value ≤10wt%.

[0067] The particle size of the machine-made sand is in the range of 0.25-0.5 mm, the methylene blue value is less than 1.4 g / kg, and the mud content is ≤ 0.5 wt%.

[0068] The admixture is prepared by uniformly mixing and grinding gold mine tailings powder, blast furnace slag and fly ash; the weight ratio of the gold mine tailings powder, blast furnace slag and fly ash is 3:6.5:2.7.

[0069] The particle size of gold tailings powder is less than 0.08mm. It is the tailings waste generated in the gold mining process. With the particle size of 0.08mm as the limit, gold tailings with a particle size less than 0.08mm are used as gold tailings powder in admixtures.

[0070] The blast furnace slag is water-quenched granulated blast furnace slag, the main components of which are silicon dioxide, aluminum oxide, calcium oxide and magnesium oxide, and the moisture content is ≤1.0wt%.

[0071] The fly ash is Class I fly ash, with a 0.045mm sieve residue ≤30%, a water requirement ratio ≤105%, and an activity index ≥70%.

[0072] The water reducing rate of water reducing agent is ≥14%.

[0073] This embodiment also provides a method for preparing an integrated assembled building module using gold mine tailings sand, specifically: 1. Pre-treatment After the gold tailings are dried at a temperature not lower than 105°C to a moisture content of ≤1.0wt%, they are screened and the gold tailings with a particle size of 0.080mm-0.5mm are screened by a powder concentrator and put into the No. 1 warehouse as gold tailings sand for standby use; the gold tailings with a particle size less than 0.080mm are put into the No. 2 warehouse as gold tailings powder for standby use.

[0074] 2. Preparation of admixtures Gold mine tailings powder, blast furnace slag and fly ash were put into a grinder (Φ2.6m×13m) in a weight ratio of 3:6.5:2.7. The grinding speed was controlled to 25rpm and the grinding rate was 22t / h to obtain the admixture.

[0075] The admixture has a fineness (0.045 mm sieve residue) of 11.0 wt %, a 7d activity index of 84%, and a 28d activity index of 92%.

[0076] 3. Premix Cement, admixture, gold mine tailings sand, machine-made sand, gravel, water and water reducing agent are weighed respectively by weight, put into a mixer, and stirred evenly to obtain a premix.

[0077] 4. Casting The premix is ​​transported to the molding workshop by a mixer truck for casting and molding. Specifically, the premix is ​​introduced into the molding mold, vibrated and compacted until no bubbles float up, and left to harden and mold to obtain a standard module blank with predetermined size and specifications.

[0078] The concrete slump of the green body before molding is 175 mm, the compressive strength is 47.5 MPa (verified by a reserved specimen during molding), the flexural strength is 6.5 MPa (verified by a reserved specimen during molding), and the appearance has no honeycomb holes, no cracks, and no exposed reinforcement.

[0079] 5. Maintenance The standard module blank obtained in the casting step is covered with a mold and cured for 2 hours, then covered with a steam curing hood, steam is introduced to raise the temperature to 80°C in 4 hours, and after heat preservation and steam curing for 13 hours, the temperature is cooled to room temperature at a cooling rate of no more than 20°C / h, and demolded to obtain an integrated assembled building module.

[0080] During the curing process, the steam pressure was controlled at 0.1MPa and the relative humidity was 100%.

[0081] The integrated assembled building module has a compressive strength of 47.5 MPa, a flexural strength of 6.5 MPa, and a water-resistance grade of P7.

[0082] 6. Post-processing After an overall inspection of the integrated prefabricated building modules and repair of possible defects, they are transferred to the finished product area. After passing the quality inspection, they are temporarily stored in the warehouse or transported to the construction site for the construction of the integrated prefabricated building.

[0083] Example 4 The present embodiment provides an integrated assembled building module prepared using gold mine tailings sand, which is composed of the following raw material components by weight: 10.3 parts of cement, 6 parts of admixture, 20 parts of gold mine tailings sand, 13.5 parts of machine-made sand, 42.3 parts of gravel, 7.4 parts of water, and 0.35 parts of water reducer.

[0084] The cement is ordinary Portland cement of grade P·O 42.5, and the product of Shandong Shanshui Cement Group Co., Ltd. is used in this embodiment.

[0085] The particle size range of gold mine tailings sand is 0.08-0.5mm. It is the tailings waste generated during the gold mining process. The main components of gold mine tailings sand are silicon dioxide and aluminum oxide, with the content of the main components exceeding 85wt%, and it also contains a small amount of potassium oxide, iron oxide, magnesium oxide, etc.

[0086] The gravel is crushed stone with a particle size range of 5-25mm, needle-like content ≤15wt%, mud content ≤1.0wt%, mud block content ≤0.5wt%, and crushing value ≤10wt%.

[0087] The particle size of the machine-made sand is in the range of 0.25-0.5 mm, the methylene blue value is less than 1.4 g / kg, and the mud content is ≤ 0.5 wt%.

[0088] The admixture is prepared by uniformly mixing and grinding gold mine tailings powder, blast furnace slag and fly ash; the weight ratio of the gold mine tailings powder, blast furnace slag and fly ash is 2:6:2.

[0089] The particle size of gold tailings powder is less than 0.08mm. It is the tailings waste generated in the gold mining process. With the particle size of 0.08mm as the limit, gold tailings with a particle size less than 0.08mm are used as gold tailings powder in admixtures.

[0090] The blast furnace slag is water-quenched granulated blast furnace slag, the main components of which are silicon dioxide, aluminum oxide, calcium oxide and magnesium oxide, and the moisture content is ≤1.0wt%.

[0091] The fly ash is Class I fly ash, with a 0.045mm sieve residue ≤30%, a water requirement ratio ≤105%, and an activity index ≥70%.

[0092] The water reducing rate of water reducing agent is ≥14%.

[0093] This embodiment also provides a method for preparing an integrated assembled building module using gold mine tailings sand, specifically: 1. Pre-treatment The gold tailings are dried at a temperature not lower than 105°C to a moisture content of ≤1.0wt%, and then screened. The gold tailings with a particle size of 0.080mm-0.5mm are screened by a powder selector and put into a No. 1 warehouse as gold tailings sand for standby use; the gold tailings with a particle size less than 0.080mm are put into a No. 2 warehouse as gold tailings powder for standby use; the gold tailings sand and anhydrous ethanol are put into a ball mill, the ball-to-material ratio is controlled to be 5.5:1, the ball milling speed is 120rpm, after ball milling for 5min, monooctadecyl phosphate is added, the ball milling is continued, and the ball milling temperature is controlled within the range of 70-75°C, after ball milling for 3h, the ball milling temperature is adjusted to be maintained within the range of 45-50°C, nonylphenol polyoxyethyl ether is added, and the ball milling is continued for 1h to obtain a ball milled product; the ball milled product is washed with anhydrous ethanol, placed in a constant temperature dryer, and dried to obtain modified gold tailings sand.

[0094] Among them, the weight ratio of gold mine tailings sand, anhydrous ethanol, monooctadecyl phosphate and nonylphenol polyoxyethyl ether is 100:55:8:2.5.

[0095] 2. Preparation of admixtures Gold mine tailings powder and fly ash were added to 3 times the weight of hydrochloric acid solution (molar concentration 0.2 mol / L), stirred for 60 minutes, and the solids were separated. After washing with deionized water until neutral, they were added to 5 times the weight of ethanol solution (volume concentration 80%), and the diamino coupling agent KBM-602 was added dropwise with stirring, and the addition time of the diamino coupling agent KBM-602 was controlled to be 1 hour. After the addition was completed, the solids were separated and placed in a constant temperature dryer for drying to obtain a pre-compound. The pre-compound and blast furnace slag were then added to a grinder (Φ2.6m×13m), and the grinding speed was controlled to be 20rpm and the grinding rate was 18t / h, and the admixture was obtained by grinding.

[0096] Among them, the weight ratio of gold mine tailings powder, fly ash and diamino coupling agent KBM-602 is 2:2:0.8.

[0097] The weight ratio of the pre-compound to the blast furnace slag is 4:6.

[0098] The admixture has a fineness (0.045 mm sieve residue) of 10.8 wt %, a 7d activity index of 86%, and a 28d activity index of 94%.

[0099] 3. Premix Cement, admixture, gold mine tailings sand, machine-made sand, gravel, water and water reducing agent are weighed respectively by weight, put into a mixer, and stirred evenly to obtain a premix.

[0100] 4. Casting The premix is ​​transported to the molding workshop by a mixer truck for casting and molding. Specifically, the premix is ​​introduced into the molding mold, vibrated and compacted until no bubbles float up, and left to harden and mold to obtain a standard module blank with predetermined size and specifications.

[0101] The concrete slump of the green body before molding is 165 mm, the compressive strength is 44.3 MPa (verified by a reserved specimen during molding), the flexural strength is 5.8 MPa (verified by a reserved specimen during molding), and the appearance has no honeycomb holes, no cracks, and no exposed reinforcement.

[0102] 5. Maintenance The standard module blank obtained in the casting step is covered with a mold and allowed to stand for 1.5 hours. The standard module blank with the mold is then covered with a steam curing hood, and steam is introduced to raise the temperature to 70°C for 3.5 hours. After heat preservation and steam curing for 12.5 hours, the temperature is cooled to room temperature at a cooling rate of no more than 20°C / h, and the mold is demolded to obtain an integrated assembled building module.

[0103] During the curing process, the steam pressure was controlled at 0.09MPa and the relative humidity was 98%.

[0104] The integrated prefabricated building module has a compressive strength of 44.3 MPa, a flexural strength of 5.8 MPa, a water-resistance grade of P8, and a drying shrinkage value of 0.17 mm / m. The integrated prefabricated building module of this embodiment is cooled to -20°C, kept warm and frozen for 8 hours, and then warmed to room temperature within 6 hours. After continuous freezing and thawing for 10 times, the compressive strength of the integrated prefabricated building module is 42.0 MPa, and the mass loss rate of the integrated prefabricated building module is 1.63%. Furthermore, the integrated prefabricated building module of this embodiment is placed in a constant temperature environment of 70°C, left to stand for 360 hours, and then naturally cooled to room temperature. The compressive strength can still reach 42.9 MPa, and the flexural strength can still reach 5.6 MPa.

[0105] 6. Post-processing After an overall inspection of the integrated prefabricated building modules and repair of possible defects, they are transferred to the finished product area. After passing the quality inspection, they are temporarily stored in the warehouse or transported to the construction site for the construction of the integrated prefabricated building.

[0106] In the present embodiment, after the gold mine tailings sand is surface modified by using monooctadecyl phosphate in the pre-treatment, the hydrophobicity of the gold mine tailings sand is improved, and the binding performance of the gold mine tailings sand with other raw materials is improved; and at the same time, nonylphenol polyoxyethyl ether is matched to further improve the participation of the gold mine tailings sand in the hydration reaction of the integrated prefabricated building module, further promote and catalyze the generation of gel hydrates, effectively fill the internal pores and defects of the concrete, and refine the concrete pore structure. At the same time, in the preparation of the admixture, the gold mine tailings powder and fly ash are first acidified and modified, and then cross-linked and modified by using a diamino coupling agent KBM-602, and after the pre-composite is obtained, the pre-composite is mixed with blast furnace slag to obtain an admixture, improve the dispersion and enhancement performance of the admixture in the integrated prefabricated building module, reduce the porosity in the concrete, and improve the density; and by improving the interface binding performance of each raw material of the integrated prefabricated building module, the overall performance of the integrated prefabricated building module is further improved.

[0107] Comparative Example 1 Comparative Example 1 adopts the technical solution of Example 1, except that copper tailings sand is used to replace gold tailings sand; and copper tailings powder is used to replace gold tailings powder.

[0108] During the preparation of the integrated prefabricated building module of Comparative Example 1, the slump of concrete before the body forming was 145 mm, the compressive strength was 37.2 MPa, and the flexural strength was 3.7 MPa.

[0109] Comparative Example 2 Comparative Example 2 adopts the technical solution of Example 1, except that iron tailings sand is used to replace gold tailings sand; and iron tailings powder is used to replace gold tailings powder.

[0110] During the preparation of the integrated prefabricated building module of Comparative Example 2, the slump of concrete before the body forming was 155 mm, the compressive strength was 34.7 MPa, and the flexural strength was 3.4 MPa.

[0111] It can be seen that the integrated prefabricated building module and preparation method prepared by using gold mine tailings sand of the present invention directly uses gold mine tailings sand with a particle size range of 0.08-0.5mm as the main raw material for the preparation of integrated prefabricated building modules, and combines gold mine tailings powder with a particle size less than 0.08mm with blast furnace slag and fly ash to prepare an admixture, which is then used for the preparation of integrated prefabricated building modules. On the one hand, the gold mine tailings source materials (gold mine tailings sand, gold mine tailings powder) directly participate in the hydration reaction of the integrated prefabricated building modules, stimulate their gel activity, promote the formation of gel hydrates, effectively fill the internal pores and defects of the concrete, and refine the pore structure of the concrete; on the other hand, the gold mine tailings source materials (gold mine tailings sand, gold mine tailings powder) catalyze the hydration process through their specific components, thereby further improving the physical properties of the integrated prefabricated building modules.

[0112] It can be seen from Comparative Examples 1-2 that after using copper ore tailings or iron ore tailings to replace gold ore tailings materials, compared with gold ore tailings materials, the degree of participation of copper ore tailings and iron ore tailings raw materials in the hydration of integrated prefabricated building modules is lower, and the ability to promote the hydration process is weaker, and the improvement effect on the microstructure and physical properties of the integrated prefabricated building modules is limited, which is specifically manifested in the reduction of concrete slump during the preparation process, and the deterioration of the compressive strength and flexural strength of the integrated prefabricated building modules.

[0113] Unless otherwise specified, all percentages used in the present invention are by mass.

[0114] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An integrated assembled building module prepared using gold mine tailings sand, characterized in that: The raw material components are as follows: 10-12 parts of cement, 4-6.5 parts of admixture, 10-20 parts of gold mine tailings sand, 13-24 parts of machine-made sand, 41-45 parts of gravel, 6-7.5 parts of water, and 0.3-0.5 parts of water reducer. The particle size of the gold mine tailings sand is in the range of 0.08-0.5 mm; The raw materials of the admixture include: gold mine tailings powder, blast furnace slag, fly ash; The particle size of the gold mine tailings powder is less than 0.08 mm.

2. The integrated assembled building module prepared by using gold mine tailings sand according to claim 1 is characterized in that: Among the raw materials of the admixture, the weight ratio of gold mine tailings powder, blast furnace slag and fly ash is 2-4:6-6.5:2-3.

3. The integrated assembled building module prepared by using gold mine tailings sand according to claim 1 is characterized in that: The stone is crushed stone with a particle size range of 5-25mm, a needle-like content ≤15wt%, a mud content ≤1.0wt%, a mud block content ≤0.5wt%, and a crushing value ≤10wt%; The machine-made sand has a particle size range of 0.25-0.5 mm, a methylene blue value of <1.4 g / kg, and a mud content of ≤0.5 wt%; The water reducing agent has a water reducing rate of ≥14%.

4. The integrated assembled building module prepared by using gold mine tailings sand according to claim 1 is characterized in that: The blast furnace slag is water-quenched granulated blast furnace slag, and the moisture content is ≤1.0wt%; The fly ash is Class I fly ash, with a 0.045 mm sieve residue of ≤30%, a water requirement ratio of ≤105%, and an activity index of ≥70%.

5. A method for preparing an integrated assembled building module using gold mine tailings sand as claimed in any one of claims 1 to 4, characterized in that: It consists of the following steps: pre-treatment, preparation of admixtures, pre-mixing, casting and curing; The pre-treatment method is as follows: drying the gold tailings at a temperature not lower than 105° C. to a moisture content of ≤1.0wt%, and then screening the gold tailings to obtain gold tailings with a particle size of 0.080mm-0.5mm as gold tailings sand; and gold tailings with a particle size less than 0.080mm as gold tailings powder; The premixing method comprises weighing cement, admixture, gold mine tailings sand, machine-made sand, gravel, water, and water reducing agent respectively by weight, putting them into a mixer, and stirring them evenly to obtain a premix; The premix is ​​cast, formed and cured to produce an integrated assembled building module.

6. The method for preparing an integrated assembled building module using gold mine tailings sand according to claim 5, characterized in that: The method for preparing the admixture is to put gold mine tailings powder, blast furnace slag and fly ash into a grinder according to weight ratio, control the grinding speed to 20-25rpm, the grinding rate to 18-22t / h, and grind to obtain the admixture.

7. The method for preparing an integrated assembled building module using gold mine tailings sand according to claim 6, characterized in that: The admixture has a fineness (0.045 mm sieve residue) of ≤12wt%, a 7d activity index of ≥80%, and a 28d activity index of ≥90%.

8. The method for preparing an integrated assembled building module using gold mine tailings sand according to claim 5, characterized in that: The casting method comprises introducing the premix into a molding die, vibrating and compacting the premix until no bubbles float, and standing the premix to harden and mold the premix, thereby obtaining a standard module blank.

9. The method for preparing an integrated assembled building module using gold mine tailings sand according to claim 5, characterized in that: The curing method comprises the following steps: covering the standard module blank obtained by casting with a mold for static curing with a film, covering the standard module blank with a mold with a steam curing hood, introducing steam to raise the temperature to 60-80° C. for 3-4 hours, curing with heat preservation steam, cooling to room temperature, demolding, and obtaining an integrated assembled building module.

10. The method for preparing an integrated assembled building module using gold mine tailings sand according to claim 9, characterized in that: During the curing, the film-covering and curing time is 1-2 hours; The curing time of 60-80℃ heat preservation steam is 12-13h; The cooling rate after thermal insulation steam curing shall not exceed 20℃ / h.