Preparation process and application of high-strength recycled aggregate concrete

Abstract

The invention relates to a preparation technology and application of high-strength recycled aggregate concrete and relates to the technical field of recycled concrete preparation, and the high-strength recycled aggregate concrete is composed of cement, recycled coarse aggregate, recycled fine aggregate, a water reducing agent, water, sand and a reinforcing material. The reinforcing materials comprise porous pelelith, epoxy resin glue, short steel fiber filaments, a preservative and coal ash powder, the short steel fiber filaments in the reinforcing materials can be conveniently dispersed and discharged through the discharging assembly, the reinforcing materials can be conveniently subjected to dry mixing and recycled aggregate concrete can be conveniently subjected to wet mixing through the dry mixing assembly and the mixing stirrer, and preparation is convenient; by adopting the porous pelelith, the short steel fibers in the reinforcing material are inserted into the holes of the porous pelelith, and are fixed through the epoxy resin glue and the coal ash powder, so that the reinforcing material forms an acanthosphere state, the strength of the prepared concrete is further improved, the anti-cracking and pressure-resistant effects are improved, and the high-strength recycled aggregate concrete is formed.

Description

Technical Field

[0001] The invention relates to the technical field of recycled concrete preparation, and in particular to a preparation process and application of high-strength recycled aggregate concrete. Background Art

[0002] Recycled aggregate concrete refers to a new type of environmentally friendly concrete material that is recycled from waste concrete or other construction waste, and then added to concrete as aggregate after screening, cleaning, crushing and other processing. As a green and environmentally friendly building material, recycled aggregate concrete has a wide range of application prospects. It can play an important role in roads, bridges, tunnels, subways, airports, water conservancy projects, etc.

[0003] For example, the announcement number is: CN112028516B, a recycled aggregate concrete preparation process, which uses a recycled aggregate concrete preparation device, the recycled aggregate concrete preparation device includes a flushing pipe, a threaded mounting pipe, a flushing mechanism, a multi-stage screening mechanism and a mud discharge mechanism, a threaded mounting pipe is installed on the top of the flushing pipe, and multi-stage screening mechanisms are installed on the left and right sides of the cavity of the flushing pipe. The flushing mechanism is penetrated through the upper surface of the side wall of the flushing pipe, and the mud discharge mechanism is provided on the left and right sides of the lower surface of the side wall of the flushing pipe; the invention can flush the screened recycled aggregate, wherein the filter screen and the partition can grade the recycled aggregate and clean the mud and sand on the surface of the recycled aggregate to be fully and thoroughly removed, which solves the problem of simple structure and poor cleaning effect of the flushing device in the prior art, resulting in incomplete flushing of the recycled aggregate; in addition, the mud after flushing in the invention can be discharged from the surface of the movable plate, which is convenient for unified collection of the mud.

[0004] Another example is the announcement number: CN103626413A, a preparation process of recycled concrete aggregate, including the following processing steps: hammering concrete blocks with a particle size greater than 300mm, cutting the steel bars in the concrete blocks, and sorting the impurities in the concrete blocks; sorting, removing iron impurities and non-iron impurities in turn; through a primary crushing process, followed by a drying heat treatment, and a secondary crushing process; screening to obtain recycled concrete aggregate particles with particle sizes of 20-40mm, 5-20mm, and less than 5mm; wind grading the recycled concrete aggregate with a particle size less than 5mm, removing the micro powder with a particle size less than 0.15mm, and obtaining recycled concrete aggregate particles of 0.15-0.5mm. In the above manner, the preparation process of recycled concrete aggregate of the invention improves the quality of recycled concrete aggregate, improves the recovery rate of waste concrete, has no secondary pollution, is economically feasible, and is easy to operate.

[0005] However, the concrete obtained during preparation has low strength, is prone to cracking when used, has poor tensile strength, is inconvenient to operate during preparation, is cumbersome to prepare, and is not convenient for large-scale production. Summary of the invention

[0006] In order to overcome the technical defects of the prior art, the present invention provides a high-strength recycled aggregate concrete preparation process and application, which is easy to operate during preparation, reduces the difficulty of the preparation process, and the prepared concrete has high strength, crack resistance and high compressive strength.

[0007] The technical solution adopted by the present invention is: a preparation process and application of high-strength recycled aggregate concrete, wherein the high-strength recycled aggregate concrete is composed of the following components: cement, recycled coarse aggregate, recycled fine aggregate, water reducer, water, sand and reinforcing material, and the reinforcing material is composed of porous volcanic stone, epoxy resin glue, short steel fiber wire, preservative and fly ash powder, and the weight ratio is respectively 15-28 parts of porous volcanic stone, 3-5 parts of epoxy resin glue, 15-30 parts of short steel fiber wire, 2-5 parts of preservative, 6-10 parts of fly ash powder, 320-380 parts of cement, 20-35 parts of recycled coarse aggregate, 100-200 parts of recycled fine aggregate, 4-8 parts of water reducer, 300-400 parts of water and 50-80 parts of sand, and when preparing, the following steps are included:

[0008] Step 1: pre-treating the raw materials, screening the recycled coarse aggregate, the recycled fine aggregate and the porous volcanic rock, and reducing the powder and slag mixed in the recycled coarse aggregate, the recycled fine aggregate and the porous volcanic rock;

[0009] Step 2: preparing the reinforcing material, mixing the components in the reinforcing material in the form of dry mixing, so that the short steel fiber filaments in the reinforcing material are inserted into the porous volcanic stone and fixed to form a thorn ball state, and then the porous volcanic stone in the thorn ball state is used to improve the compressive and tensile properties of the prepared concrete, improve the strength, and reduce the risk of cracking;

[0010] Step 3: Mix the reinforcing material with the cement, the recycled coarse aggregate, the recycled fine aggregate and the sand, and during the mixing, improve the mixing effect so that the dry materials are fully mixed and stirred;

[0011] Step 4: Add the water reducer and the water to the mixture mixed in step 3, mix them, and prepare high-strength recycled aggregate concrete.

[0012] Preferably, the recycled coarse aggregate is obtained by crushing, washing, drying and grading waste concrete, and the recycled fine aggregate is obtained by crushing, washing and drying waste mortar, and the recycled aggregate is obtained by utilizing abandoned buildings to improve the green environmental protection effect.

[0013] Preferably, during the preparation, the equipment used includes a frame, a feeding assembly is fixedly installed on the upper end of the frame, a dry mixing assembly for mixing and preparing the reinforcing material is fixedly installed on the frame at the lower end of the feeding assembly, and a mixing and stirring machine for wet mixing the remaining materials with the reinforcing material is fixedly installed at the lower end of the frame. During use, the short steel fiber filaments in the reinforcing material are dispersed and fed into the dry mixing assembly through the feeding assembly, and porous volcanic stone is poured into the dry mixing assembly, so that when the short steel fiber filaments are mixed with the porous volcanic stone, epoxy resin glue is sprayed to facilitate the mixing of the short steel fiber filaments. The short steel fiber filaments are inserted into the holes on the porous volcanic stone and are bonded and connected by epoxy resin glue. After stirring, fly ash powder is poured in to fill the gaps on the porous volcanic stone, so that a thorn ball shape similar to that of cocklebur is formed between the porous volcanic stone and the short steel fiber filaments. After mixing through a dry mixing component, the dry mixing component is turned over, and the thorn ball-shaped reinforcement material is poured into a mixing mixer, and cement, recycled coarse aggregate, recycled fine aggregate and sand are gradually poured in. After stirring through the mixing mixer, a water reducer and water are poured in, and stirring is continued to form a high-strength recycled aggregate concrete to complete the preparation.

[0014] Preferably, the material discharge assembly includes a material discharge ring, and a crankshaft is rotatably installed inside the material discharge ring in an array, a material discharge hopper is fixedly installed on the upper end of the material discharge ring, and an auxiliary ring is fixedly installed on the lower end of the material discharge ring, the upper end of the frame is fixedly connected to the two sides of the auxiliary ring, and liquid spray nozzles are evenly fixedly installed at both ends of the inner side of the auxiliary ring, and the liquid spray nozzle is used to spray the preservative, and liquid supply pipes are fixedly installed at both ends of the outer side of the auxiliary ring, and the liquid supply pipe is connected with the liquid spray nozzle, and an input pipe is fixedly installed between the liquid supply pipes at both ends, and the input pipe is connected with an external preservative pressurized supply device, through the The feeding ring and the crankshaft, when feeding the short steel fiber wires, the crankshaft rotates, so that the short steel fiber wires are dispersed through the crankshaft and enter the interior of the auxiliary ring, and the preservative enters the interior of the liquid supply pipe through the input pipe and is sprayed out through the liquid spray nozzle, so that the preservative is evenly sprayed on the surface of the falling short steel fiber wires, forming an anti-corrosion layer on the surface of the short steel fiber wires, thereby improving the anti-corrosion effect during long-term use and increasing the service life. Through the feeding hopper, a large number of short steel fiber wires can be placed in the interior of the feeding component at one time, reducing the process of repeated operations and improving the preparation efficiency.

[0015] Preferably, a limit frame is fixedly installed on one side of the unloading ring, and a rack is slidably clamped inside the limit frame, a gear is fixedly installed on one end of the crankshaft, the rack is meshed with the gear, and an electric telescopic rod is fixedly installed on the lower end of the limit frame, one end of the rack is an L-shaped structure, one end of the rack is fixedly connected to the output end of the electric telescopic rod, and the rack is driven to reciprocate by the electric telescopic rod, and then the gear is reciprocated, which is convenient for driving the crankshaft and making the crankshafts staggered with each other, so as to facilitate the dispersed unloading of short steel fiber wires and control the unloading effect.

[0016] Preferably, a sliding groove is provided at the inner lower end of the limit frame, and a slider of a T-shaped structure is fixedly installed at the lower end of the rack. The slider is slidably engaged with the sliding groove. Through the sliding groove and the slider, the rack can be easily guided and limited, thereby improving the stability of driving the crankshaft.

[0017] Preferably, the dry mixing component includes a mixing bucket, which is a semi-cylindrical structure with a hollow upper end, and a shaft is rotatably installed in the middle position of the mixing bucket, both ends of the shaft are rotatably installed on the frame, and a driving motor is fixedly installed on one end of the shaft, the driving motor is fixedly connected to the frame on one side, and the output shaft of the driving motor is fixedly connected to the shaft, and a stirring plate in the shape of a sieve plate is fixedly installed on the shaft inside the mixing bucket, and the shaft is driven by the driving motor to rotate, so that the stirring plate rotates, and after the porous volcanic stone is poured into the mixing bucket, the stirring plate stirs and stirs the porous volcanic stone and short steel fiber filaments to improve the uniformity during mixing, and makes the porous volcanic stone roll on the stirring plate, so as to facilitate the insertion of the short steel fiber filaments into the holes on the porous volcanic stone.

[0018] Preferably, a gear ring is fixedly installed on one side of the mixing bucket, and the gear ring is located on the periphery of the shaft rod, a servo motor with a self-locking function is fixedly installed on the frame on one side, and a driving gear is fixedly installed on the output end of the servo motor, and the driving gear is meshed with the gear ring. When stirring is performed, the servo motor is locked, thereby improving the stability of the mixing bucket during the stirring process, and after the stirring is completed, the servo motor drives the driving gear to rotate, so that the gear ring drives the mixing bucket to flip on the shaft rod, which is convenient for pouring the material inside the mixing bucket into the interior of the mixing mixer for sequential production, convenient for unloading, and convenient for use.

[0019] Preferably, a main pipe for conveying epoxy resin glue is fixedly installed on one side of the mixing bucket, and branch pipes are fixedly installed in an array on the main pipe, a glue spray head is fixedly installed on one end of the branch pipe, and the glue spraying direction of the glue spray head is opposite to the position of the shaft rod, and a glue supply hose is fixedly installed in the middle position of the main pipe, through the glue supply hose, the epoxy resin glue is conveniently supplied to the interior of the main pipe, and sprayed out from the interior of the glue spray head through the branch pipe, so that the epoxy resin glue is evenly sprayed into the interior of the mixing bucket, so that the short steel fiber filaments are bonded to the porous volcanic stone, thereby improving the effect of mixing and connecting.

[0020] The invention discloses an application of high-strength recycled aggregate concrete, wherein the concrete prepared by the high-strength recycled aggregate concrete preparation process is applied in the construction of buildings, bridges and roads.

[0021] The beneficial effects of the present invention are:

[0022] 1. By adopting the blanking assembly, it is convenient to disperse and blank the short steel fiber wires in the reinforcement material, and when blanking, the surface of the short steel fiber wires is sprayed with anti-corrosion agent to improve the corrosion resistance of the short steel fiber wires during long-term use.

[0023] 2. By adopting dry mixing components and mixing mixers, it is convenient to dry mix the reinforcing materials and wet mix the recycled aggregate concrete, which facilitates the preparation, reduces the difficulty of preparation, and improves the convenience effect during preparation.

[0024] 3. By using porous volcanic rocks, the short steel fiber filaments in the reinforcing material are inserted into the pores of the porous volcanic rocks and fixed by epoxy resin glue and fly ash powder, so that the reinforcing material forms a spiky ball state, thereby improving the strength of the prepared concrete, improving the crack resistance and pressure resistance, and forming high-strength recycled aggregate concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the ratio of the present invention;

[0026] Figure 2 This is a schematic diagram of the preparation process of the present invention;

[0027] Figure 3 It is a schematic diagram of the overall structure of the preparation equipment of the present invention;

[0028] Figure 4 This is a schematic diagram of the overall structure of the preparation device of the present invention from another angle;

[0029] Figure 5 It is a structural schematic diagram of the position of the dry mixing component in the present invention;

[0030] Figure 6It is a structural schematic diagram of the mixing bucket position in the present invention;

[0031] Figure 7 It is a structural schematic diagram of the blanking assembly in the present invention;

[0032] Figure 8 It is a structural schematic diagram of the crankshaft position in the present invention;

[0033] Fig. 9 It is a structural schematic diagram of the position of the lower hopper in the present invention;

[0034] Fig.10 It is a structural schematic diagram of the position of the auxiliary ring in the present invention;

[0035] Fig.11 Schematic diagram of performance test results of various embodiments of the present invention.

[0036] Explanation of the accompanying drawings: In the figure: 1, frame; 2, unloading assembly; 201, unloading ring; 202, crankshaft; 203, unloading hopper; 204, auxiliary ring; 205, liquid spray nozzle; 206, liquid supply pipe; 207, input pipe; 208, limit frame; 209, rack; 2010, gear; 2011, electric telescopic rod; 2012, slide; 2013, slider; 3, dry mixing assembly; 301, mixing bucket; 302, shaft; 303, driving motor; 304, stirring plate; 305, gear ring; 306, servo motor; 307, driving gear; 308, main pipe; 309, branch pipe; 3010, glue spray head; 3011, glue supply hose; 4, mixing mixer. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings:

[0038] Embodiment 1

[0039] like Figure 1-Figure 11 As shown, this embodiment provides a preparation process and application of high-strength recycled aggregate concrete, wherein the high-strength recycled aggregate concrete is composed of the following ingredients: cement, recycled coarse aggregate, recycled fine aggregate, water reducer, water, sand and reinforcing material, and the reinforcing material is composed of porous volcanic stone, epoxy resin glue, short steel fiber wire, preservative and fly ash powder, and the weight ratio is 15 parts of porous volcanic stone, 3 parts of epoxy resin glue, 15 parts of short steel fiber wire, 2 parts of preservative, 6 parts of fly ash powder, 320 parts of cement, 20 parts of recycled coarse aggregate, 100 parts of recycled fine aggregate, 4 parts of water reducer, 300 parts of water and 50 parts of sand, and during the preparation, the following steps are included:

[0040] Step 1: pre-treat the raw materials, screen the recycled coarse aggregate, recycled fine aggregate and porous volcanic rock, and reduce the powder and slag mixed in the recycled coarse aggregate, recycled fine aggregate and porous volcanic rock.

[0041] Step 2: Prepare the reinforcing material by dry mixing the components in the reinforcing material so that the short steel fiber filaments in the reinforcing material are inserted into the porous volcanic rock and fixed to form a thorn ball state. Then, the porous volcanic rock in the thorn ball shape can improve the compressive and tensile properties of the prepared concrete, increase the strength, and reduce the risk of cracking.

[0042] Step 3: Mix the reinforcing material with cement, recycled coarse aggregate, recycled fine aggregate and sand. During the mixing process, improve the mixing effect so that the dry materials are fully mixed and stirred.

[0043] Step 4: Add a water reducing agent and water to the mixture mixed in step 3, mix them, and prepare high-strength recycled aggregate concrete.

[0044] The recycled coarse aggregate is obtained by crushing, washing, drying and grading waste concrete, and the recycled fine aggregate is obtained by crushing, washing and drying waste mortar. Abandoned buildings are used for recycling to improve green environmental protection effects.

[0045] During the preparation, the equipment used includes a frame 1, a feeding component 2 is fixedly installed on the upper end of the frame 1, a dry mixing component 3 for mixing and preparing the reinforcing material is fixedly installed at the lower end of the feeding component 2 on the frame 1, and a mixing and stirring machine 4 for wet mixing the remaining materials with the reinforcing material is fixedly installed at the lower end of the frame 1. During use, the short steel fiber filaments in the reinforcing material are dispersed and fed into the dry mixing component 3 through the feeding component 2, and porous volcanic rocks are poured into the dry mixing component 3, so that when the short steel fiber filaments are mixed with the porous volcanic rocks, epoxy resin glue is sprayed to facilitate the short steel fiber filaments to be plugged into the multi-porous volcanic rocks. The holes on the porous volcanic stone are filled with fly ash powder, and the holes are bonded and connected with epoxy resin glue. After the mixing is completed, fly ash powder is poured in to fill the gaps on the porous volcanic stone, so that a thorn ball shape similar to that of cocklebur is formed between the porous volcanic stone and the short steel fiber wires. After mixing through the dry mixing component 3, the dry mixing component 3 is turned over, and the reinforcing material in the thorn ball shape is poured into the mixing mixer 4, and cement, recycled coarse aggregate, recycled fine aggregate and sand are gradually poured in. After mixing through the mixing mixer 4, a water reducer and water are poured in, and the mixing is continued to form a high-strength recycled aggregate concrete to complete the preparation.

[0046] The material discharge assembly 2 includes a material discharge ring 201, and a crankshaft 202 is rotatably installed in an array inside the material discharge ring 201, a material discharge hopper 203 is fixedly installed on the upper end of the material discharge ring 201, and an auxiliary ring 204 is fixedly installed on the lower end of the material discharge ring 201, the upper end of the frame 1 is fixedly connected to both sides of the auxiliary ring 204, and liquid spray nozzles 205 are evenly fixedly installed at both ends of the inner side of the auxiliary ring 204, and the liquid spray nozzle 205 is used to spray the preservative, and liquid supply pipes 206 are fixedly installed at both ends of the outer side of the auxiliary ring 204, and the liquid supply pipes 206 are connected to the liquid spray nozzles 205, and the liquid supply pipes 206 at both ends are fixedly installed. An input pipe 207 is installed, and the input pipe 207 is connected to the external preservative pressure supply device. Through the feeding ring 201 and the crankshaft 202, when the short steel fiber yarn is fed, the crankshaft 202 rotates, so that the short steel fiber yarn is dispersed through the crankshaft 202 and enters the interior of the auxiliary ring 204, and the preservative enters the interior of the liquid supply pipe 206 through the input pipe 207, and is sprayed out through the liquid spray nozzle 205, so that the preservative is evenly sprayed on the surface of the falling short steel fiber yarn, and an anti-corrosion layer is formed on the surface of the short steel fiber yarn, thereby improving the anti-corrosion effect during long-term use, and improving the service life. Through the unloading hopper 203, it is convenient to place a large number of short steel fiber wires in the unloading component 2 at one time, reduce the repeated operation process, and improve the preparation efficiency. A limit frame 208 is fixedly installed on one side of the unloading ring 201, and a rack 209 is slidably connected inside the limit frame 208. A gear 2010 is fixedly installed at one end of the crankshaft 202, and the rack 209 is meshed with the gear 2010. An electric telescopic rod 2011 is fixedly installed at the lower end of the limit frame 208, and one end of the rack 209 is an L-shaped structure. One end of the rack 209 is fixedly connected to the output end of the electric telescopic rod 2011, and the electric The movable telescopic rod 2011 drives the rack 209 to reciprocate, thereby causing the gear 2010 to reciprocate, which is convenient for driving the crankshaft 202, so that the crankshafts 202 are staggered with each other, which is convenient for dispersing the short steel fiber wires and controlling the feeding effect. A slide groove 2012 is provided at the lower end of the inner part of the limit frame 208, and a T-shaped slider 2013 is fixedly installed at the lower end of the rack 209. The slider 2013 is slidably engaged with the slide groove 2012. Through the slide groove 2012 and the slider 2013, the rack 209 is conveniently guided and limited, thereby improving the stability of driving the crankshaft 202.

[0047] The dry mixing component 3 includes a mixing bucket 301, which is a semi-cylindrical structure with a hollow upper end, and a shaft 302 is rotatably installed in the middle position of the mixing bucket 301, and both ends of the shaft 302 are rotatably installed on the frame 1, and a driving motor 303 is fixedly installed on one end of the shaft 302, and the driving motor 303 is fixedly connected to the frame 1 on one side, and the output shaft of the driving motor 303 is fixedly connected to the shaft 302, and a sieve plate-shaped stirring plate 304 is fixedly installed on the shaft 302 inside the mixing bucket 301, and the shaft 302 is driven by the driving motor 303 to rotate, so that the stirring The stirring plate 304 rotates, and after the porous volcanic stone is poured into the mixing bucket 301, the stirring plate 304 stirs and stirs the porous volcanic stone and the short steel fiber wire to improve the uniformity during mixing, and makes the porous volcanic stone roll on the stirring plate 304, so as to facilitate the insertion of the short steel fiber wire into the holes on the porous volcanic stone. A gear ring 305 is fixedly installed on one side of the mixing bucket 301, and the gear ring 305 is located on the periphery of the shaft 302. A servo motor 306 with a self-locking function is fixedly installed on one side of the frame 1, and a drive motor 306 is fixedly installed on the output end of the servo motor 306. The driving gear 307 is meshed with the gear ring 305. When stirring, the servo motor 306 is locked, thereby improving the stability of the mixing bucket 301 during the stirring process. After the stirring is completed, the servo motor 306 drives the driving gear 307 to rotate, so that the gear ring 305 drives the mixing bucket 301 to flip on the shaft 302, which is convenient for pouring the materials in the mixing bucket 301 into the mixing mixer 4 for sequential production, convenient for unloading, and convenient for use. A main pipe 3 for conveying epoxy resin glue is fixedly installed on one side of the mixing bucket 301. 08, and branch pipes 309 are fixedly installed in an array on the main pipe 308, a glue spray head 3010 is fixedly installed at one end of the branch pipe 309, and the glue spraying direction of the glue spray head 3010 is opposite to the position of the shaft rod 302, and a glue supply hose 3011 is fixedly installed in the middle position of the main pipe 308. Through the glue supply hose 3011, the epoxy resin glue is easily supplied into the interior of the main pipe 308, and sprayed out from the interior of the glue spray head 3010 through the branch pipe 309, so that the epoxy resin glue is evenly sprayed into the interior of the mixing bucket 301, so that the short steel fiber wire and the porous volcanic stone are bonded, thereby improving the effect of mixed connection.

[0048] The invention discloses an application of high-strength recycled aggregate concrete, wherein the concrete prepared by the high-strength recycled aggregate concrete preparation process is applied in the construction of buildings, bridges and roads.

[0049] Embodiment 2

[0050] The difference between this embodiment and the first embodiment is that the high-strength recycled aggregate concrete is composed of cement, recycled coarse aggregate, recycled fine aggregate, water reducer, water, sand and reinforcing material, and the reinforcing material is composed of porous volcanic stone, epoxy resin glue, short steel fiber wire, preservative and fly ash powder, and the weight ratio is 18 parts of porous volcanic stone, 3.5 parts of epoxy resin glue, 20 parts of short steel fiber wire, 2.5 parts of preservative, 7 parts of fly ash powder, 340 parts of cement, 22 parts of recycled coarse aggregate, 110 parts of recycled fine aggregate, 5 parts of water reducer, 320 parts of water and 60 parts of sand, and the preparation steps and preparation method are the same as those in the first embodiment.

[0051] Embodiment 3

[0052] The difference between this embodiment and the first embodiment is that the high-strength recycled aggregate concrete is composed of cement, recycled coarse aggregate, recycled fine aggregate, water reducer, water, sand and reinforcing material, and the reinforcing material is composed of porous volcanic stone, epoxy resin glue, short steel fiber wire, preservative and fly ash powder, and the weight ratio is 22 parts of porous volcanic stone, 4 parts of epoxy resin glue, 22 parts of short steel fiber wire, 3 parts of preservative, 8 parts of fly ash powder, 360 parts of cement, 30 parts of recycled coarse aggregate, 150 parts of recycled fine aggregate, 6 parts of water reducer, 350 parts of water and 70 parts of sand, and the preparation steps and preparation method are the same as those in the first embodiment.

[0053] Embodiment 4

[0054] The difference between this embodiment and the first embodiment is that the high-strength recycled aggregate concrete is composed of cement, recycled coarse aggregate, recycled fine aggregate, water reducer, water, sand and reinforcing material, and the reinforcing material is composed of porous volcanic stone, epoxy resin glue, short steel fiber wire, preservative and fly ash powder, and the weight ratio is 25 parts of porous volcanic stone, 4.5 parts of epoxy resin glue, 25 parts of short steel fiber wire, 4 parts of preservative, 8 parts of fly ash powder, 370 parts of cement, 32 parts of recycled coarse aggregate, 180 parts of recycled fine aggregate, 7 parts of water reducer, 380 parts of water and 75 parts of sand, and the preparation steps and preparation method are the same as those in the first embodiment.

[0055] Embodiment 5

[0056] The difference between this embodiment and the first embodiment is that the high-strength recycled aggregate concrete is composed of cement, recycled coarse aggregate, recycled fine aggregate, water reducer, water, sand and reinforcing material, and the reinforcing material is composed of porous volcanic stone, epoxy resin glue, short steel fiber wire, preservative and fly ash powder, and the weight ratio is 28 parts of porous volcanic stone, 5 parts of epoxy resin glue, 30 parts of short steel fiber wire, 5 parts of preservative, 10 parts of fly ash powder, 380 parts of cement, 35 parts of recycled coarse aggregate, 200 parts of recycled fine aggregate, 8 parts of water reducer, 400 parts of water and 80 parts of sand, and the preparation steps and preparation method are the same as those in the first embodiment.

[0057] Comparative Example 1

[0058] The difference between this comparative example and Examples 1 to 5 is that dry mixing is not performed, and the raw materials of cement, recycled coarse aggregate, recycled fine aggregate, water reducer, water, sand, porous volcanic stone, epoxy resin glue, short steel fiber, preservative and fly ash powder are directly mixed, and when used, the weight ratio is the same as that in Example 1, and the concrete prepared is obtained.

[0059] The concrete prepared in Examples 1 to 5 and Comparative Example 1 was subjected to performance tests:

[0060] When conducting the compressive strength test, a cubic test block with a size of 15cm*10cm*20cm is prepared. After curing and maintenance, it is placed for 30 days as an experimental sample. The compressive strength of the experimental samples is tested in accordance with GBT50107-2010 "Concrete Strength Test and Evaluation Standard". The higher the value, the better the compressive strength.

[0061] When conducting the splitting tensile strength test, a cubic test block with a size of 15cm*10cm*20cm is prepared. After curing and maintenance, it is placed for 28 days as an experimental sample. The splitting tensile strength is tested in accordance with GB / T50081-2002 "Standard Test Method for Mechanical Properties of Ordinary Concrete". The higher the value, the better the splitting tensile strength of the surface concrete.

[0062] After testing, the results are as follows Fig.11 shown.

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention shall be defined by the attached claims and their equivalents.

Claims

1. A process for preparing high-strength recycled aggregate concrete, characterized in that: The high-strength recycled aggregate concrete is composed of the following ingredients: cement, recycled coarse aggregate, recycled fine aggregate, water reducer, water, sand and reinforcing material, and the reinforcing material is composed of porous volcanic stone, epoxy resin glue, short steel fiber, preservative and fly ash powder, and the weight ratio is 15-28 parts of porous volcanic stone, 3-5 parts of epoxy resin glue, 15-30 parts of short steel fiber, 2-5 parts of preservative, 6-10 parts of fly ash powder, 320-380 parts of cement, 20-35 parts of recycled coarse aggregate, 100-200 parts of recycled fine aggregate, 4-8 parts of water reducer, 300-400 parts of water and 50-80 parts of sand, and when preparing, it includes the following steps: Step 1: pre-treating the raw materials, screening the recycled coarse aggregate, the recycled fine aggregate and the porous volcanic rock; Step 2: preparing the reinforcing material by dry mixing the components in the reinforcing material so that the short steel fiber filaments in the reinforcing material are inserted into the porous volcanic stone and fixed to form a thorn ball state; Step 3, mixing the reinforcing material with the cement, the recycled coarse aggregate, the recycled fine aggregate and the sand; Step 4: Add the water reducer and the water to the mixture mixed in step 3, mix them, and prepare high-strength recycled aggregate concrete.

2. The high-strength recycled aggregate concrete preparation process according to claim 1, characterized in that: The recycled coarse aggregate is obtained by crushing, washing, drying and grading waste concrete, and the recycled fine aggregate is obtained by crushing, washing and drying waste mortar.

3. The process for preparing high-strength recycled aggregate concrete according to claim 1, characterized in that: During the preparation, the equipment used comprises a frame (1), a material discharge assembly (2) is fixedly mounted on the upper end of the frame (1), a dry mixing assembly (3) for mixing and preparing the reinforcing material is fixedly mounted on the frame (1) at the lower end of the material discharge assembly (2), and a mixing and stirring machine (4) for wet mixing the remaining materials with the reinforcing material is fixedly mounted on the lower end of the frame (1).

4. The process for preparing high-strength recycled aggregate concrete according to claim 3, characterized in that: The material discharge assembly (2) comprises a material discharge ring (201), and a crankshaft (202) is rotatably mounted inside the material discharge ring (201) in an array, a material discharge hopper (203) is fixedly mounted on the upper end of the material discharge ring (201), and an auxiliary ring (204) is fixedly mounted on the lower end of the material discharge ring (201), the upper end of the frame (1) is fixedly connected to both sides of the auxiliary ring (204), and the inner side of the auxiliary ring (204) is fixedly connected to the inner side of the auxiliary ring (204). Liquid spray nozzles (205) are evenly and fixedly installed at both ends, and the liquid spray nozzles (205) are used to spray the preservative. Liquid supply pipes (206) are fixedly installed at both ends of the outer side of the auxiliary ring (204), and the liquid supply pipes (206) are connected to the liquid spray nozzles (205). An input pipe (207) is fixedly installed between the liquid supply pipes (206) at both ends, and the input pipe (207) is connected to an external preservative pressure supply device.

5. The process for preparing high-strength recycled aggregate concrete according to claim 4, characterized in that: A limit frame (208) is fixedly mounted on one side of the unloading ring (201), and a rack (209) is slidably engaged inside the limit frame (208), a gear (2010) is fixedly mounted on one end of the crankshaft (202), the rack (209) is meshed with the gear (2010), and an electric telescopic rod (2011) is fixedly mounted on the lower end of the limit frame (208), one end of the rack (209) is an L-shaped structure, and one end of the rack (209) is fixedly connected to the output end of the electric telescopic rod (2011).

6. The process for preparing high-strength recycled aggregate concrete according to claim 5, characterized in that: A sliding groove (2012) is provided at the inner lower end of the limit frame (208), and a sliding block (2013) of a T-shaped structure is fixedly installed at the lower end of the rack (209), and the sliding block (2013) is slidably engaged with the sliding groove (2012).

7. The process for preparing high-strength recycled aggregate concrete according to claim 3, characterized in that: The dry mixing component (3) comprises a mixing bucket (301), the mixing bucket (301) is a semi-cylindrical structure with a hollow upper end, and a shaft (302) is rotatably mounted in the middle position of the mixing bucket (301), both ends of the shaft (302) are rotatably mounted on the frame (1), and a driving motor (303) is fixedly mounted on one end of the shaft (302), the driving motor (303) is fixedly connected to the frame (1) on one side, the output shaft of the driving motor (303) is fixedly connected to the shaft (302), and a stirring plate (304) in the shape of a sieve plate is fixedly mounted on the shaft (302) and located inside the mixing bucket (301).

8. The process for preparing high-strength recycled aggregate concrete according to claim 7, characterized in that: A gear ring (305) is fixedly mounted on one side of the mixing bucket (301), and the gear ring (305) is located on the periphery of the shaft (302); a servo motor (306) with a self-locking function is fixedly mounted on the frame (1) on one side, and a driving gear (307) is fixedly mounted on the output end of the servo motor (306), and the driving gear (307) is meshed with the gear ring (305).

9. The process for preparing high-strength recycled aggregate concrete according to claim 8, characterized in that: A main pipe (308) for conveying epoxy resin glue is fixedly installed on one side of the mixing bucket (301), and branch pipes (309) are fixedly installed in an array on the main pipe (308), a glue spraying head (3010) is fixedly installed at one end of the branch pipe (309), and the glue spraying direction of the glue spraying head (3010) is opposite to the position of the shaft (302), and a glue supply hose (3011) is fixedly installed in the middle position of the main pipe (308).

10. An application of high-strength recycled aggregate concrete, characterized in that: The concrete prepared by the high-strength recycled aggregate concrete preparation process according to any one of claims 1 to 9 is used in the construction of buildings, bridges and roads.

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