Reinforcing method of waste construction waste particles

Abstract

The invention discloses a reinforcing method of waste construction waste particles. The reinforcing method comprises the following steps: S1, selecting waste construction waste; s2, grinding the aggregate particles; s2, the aggregate particles reserved in the step S1 are placed in a grinding machine or an abrasion instrument, and the cement mortar attached to the surfaces of the aggregates is ground; grinding is conducted at the high temperature of 300 DEG C while the surface of the aggregate is ground; step S3, preparing a reinforcing agent solution of KH-550; s4, soaking the aggregate particles polished in the step S2 in an enhancer solution for more than 24 hours; and S5, the soaked aggregate particles are put into a drying box to be dried, and the reinforced regenerated aggregate particles are obtained. According to the strengthening method for the waste building waste particles, a composite strengthening mode is adopted, and regeneration strengthening of the waste building particles is achieved through multi-angle composite strengthening of physical polishing, chemical filling and organic strengthening.

Description

Technical Field

[0001] The invention belongs to the technical field of construction waste recycling and treatment, and in particular relates to a method for strengthening waste construction waste particles. Background Art

[0002] As my country's urbanization pace accelerates, many urban and rural buildings are demolished, and the amount of construction waste continues to increase, accounting for 30-40% of the total urban waste. The resource utilization of construction waste is related to the coordinated development of the urban ecological environment, and the comprehensive utilization of construction waste in my country is urgent.

[0003] Waste aggregates are crushed from construction waste and can be used to replace natural aggregates to prepare mixtures. The use of waste construction aggregates can not only effectively reduce the pollution of construction waste to the environment and realize its resource utilization, but also reduce the waste of natural mineral resources. However, the road performance of waste construction aggregates is poor, which to some extent affects the application of mixtures in actual projects.

[0004] Although waste aggregates can replace natural aggregates to a certain extent, the performance of the mixture prepared by them is weakened, which will lead to secondary crushing of aggregates and other related problems in practical applications. Although scholars have conducted some research on the strengthening of recycled aggregates, there is little research on its internal optimization mechanism, and no economic and scientific strengthening plan has been obtained.

[0005] However, the surface of recycled aggregate is easy to adhere to cement mortar, and in the long-term service process, there are a lot of structural defects such as fine cracks on its surface, which will lead to an increase in asphalt usage and a decrease in the strength of the mixture when preparing asphalt mixture. By strengthening the recycled aggregate, the microscopic defects on the surface of the recycled aggregate can be effectively improved, the interface adhesion between the aggregate and asphalt can be improved, and the macroscopic performance of the mixture can be improved from the microscopic optimization mechanism.

[0006] Therefore, there is a need to develop a method for strengthening waste construction waste particles in this field that can effectively solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to provide a method for strengthening waste construction waste particles, which adopts a composite strengthening method and uses multi-angle composite strengthening of physical grinding, chemical filling and organic strengthening to achieve the regeneration and strengthening of waste construction waste particles.

[0008] To achieve the above object, the present invention provides a method for strengthening waste construction waste particles, comprising the following steps: Step S1, selecting waste construction waste; Step S11, crushing the waste construction waste to obtain aggregate particles; Step S12, removing rubber and wood waste contained in the aggregate particles; Step S13, screening through a standard square hole sieve, retaining aggregate particles with a particle size of ≥2.35 mm for subsequent strengthening; Step S2, grinding aggregate particles; The aggregate particles retained in step S1 are placed in a grinder or an abrasion tester to grind the cement mortar attached to the surface of the aggregate; the grinding is performed at a high temperature of 300° C. while grinding the surface of the aggregate; Step S3, preparing a KH-550 enhancer solution; Step S4, soaking the aggregate particles polished in step S2 in a strengthening agent solution for more than 24 hours; Step S5: putting the soaked aggregate particles into a drying box for drying to obtain reinforced recycled aggregate particles.

[0009] Preferably, in step S1, the aggregate particles include waste aggregate and cement mortar particles; and the aggregate particles having a particle size of 2.35 mm to 16.00 mm are retained by a standard square hole sieve.

[0010] Preferably, step S2 specifically comprises: Step S21, putting the aggregate particles retained in step S1 into an oven at a weight of 15 kg / portion and heating to 250° C. to 300° C.; Step S22, after heating, place the mixture in a grinder or abrasion tester, set the rotation speed of the instrument to 50 r / min, and take out the aggregate particles after running for 5 minutes; Step S23, repeating steps S21 and S22, sieving and polishing again to remove cement mortar attached to the surface, and removing surface dust by washing with water, and then putting into an oven to dry.

[0011] Preferably, in step S3, the reinforcing agent is silane coupling agent KH-550, and the concentration of the configured solution is 5% to 10%.

[0012] Preferably, in step S5, the oven drying temperature is set to 80°C.

[0013] The present invention adopts the above-mentioned method for strengthening waste construction waste particles, and the beneficial effects are as follows: (1) In the method provided by the present invention, the microscopic gaps on the surface of the recycled aggregate particles can be blocked by soaking in the KH-550 strengthening agent, thereby improving the adsorption performance of the aggregate to asphalt, thereby further improving the road performance of the recycled aggregate asphalt mixture; (2) The raw materials involved in the present invention are low in cost. The silane coupling agent KH-550 reinforcing agent used is only 3% to 4% of the mass of the recycled aggregate particles. In addition, the overall preparation process is simple, which is conducive to large-scale practical production.

[0014] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a flowchart of an embodiment of a method for strengthening waste construction waste particles. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0017] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0018] like Figure 1 As shown, a method for strengthening waste construction waste particles comprises the following steps: Step S1, selecting waste construction waste.

[0019] Step S11, crushing the waste construction waste to obtain aggregate particles, wherein the aggregate particles include waste aggregate and cement mortar particles.

[0020] Step S12: removing rubber and wood waste contained in the aggregate particles.

[0021] Step S13: Screening is performed using a standard square hole sieve to retain aggregate particles with a particle size of ≥2.35 mm for subsequent strengthening.

[0022] Aggregate particles with a particle size of 2.35mm~16.00mm are retained through a standard square hole sieve.

[0023] Step S2, grinding aggregate particles. The aggregate particles retained in step S1 are placed in a grinder or an abrasion tester to grind the cement mortar attached to the aggregate surface. While grinding the aggregate surface, grinding is performed at a high temperature of 300° C. to reduce the adhesion of the cement mortar.

[0024] Step S21, placing the aggregate particles retained in step S1 into an oven at a weight of 15 kg / portion and heating to 250°C-300°C.

[0025] Step S22: After heating, place the mixture in a grinder or abrasion tester, set the rotation speed of the instrument to 50 r / min, and take out the aggregate particles after running for 5 minutes.

[0026] Step S23, repeating steps S21 and S22, sieving and polishing again to remove cement mortar attached to the surface, and removing surface dust by washing with water, and then putting into an oven to dry.

[0027] Step S3, preparing a KH-550 enhancer solution.

[0028] The reinforcing agent is silane coupling agent KH-550, and the concentration of the configured solution is 5%~10%.

[0029] Step S4, soaking the aggregate particles polished in step S2 in a strengthening agent solution for more than 24 hours.

[0030] Step S5, putting the soaked aggregate particles into a drying oven for drying, and setting the drying temperature of the oven to 80° C. to obtain reinforced recycled aggregate particles.

[0031] Embodiment 1 A method for strengthening waste construction waste particles comprises the following steps: Step S1, selecting waste construction waste.

[0032] Step S11, crushing the waste construction waste to obtain aggregate particles, wherein the aggregate particles include waste aggregate and cement mortar particles.

[0033] Step S12: removing rubber and wood waste contained in the aggregate particles.

[0034] Step S13: Screening is performed using a standard square hole sieve to retain aggregate particles with a particle size of 2.35 mm to 16.00 mm for subsequent strengthening.

[0035] Step S2, grinding aggregate particles. The aggregate particles retained in step S1 are placed in a grinder or an abrasion tester to grind the cement mortar attached to the surface of the aggregate.

[0036] Step S21, putting the aggregate particles retained in step S1 into an oven at a weight of 15 kg / portion and heating to 280°C.

[0037] Step S22: After heating, place the mixture in a grinder or abrasion tester, set the rotation speed of the instrument to 50 r / min, and take out the aggregate particles after running for 5 minutes.

[0038] Step S23, repeating steps S21 and S22, sieving and polishing again to remove cement mortar attached to the surface, and removing surface dust by washing with water, and then putting into an oven to dry.

[0039] Step S3, preparing a KH-550 enhancer solution.

[0040] The reinforcing agent is silane coupling agent KH-550, and the concentration of the configured solution is 8%.

[0041] Step S4, soaking the aggregate particles polished in step S2 in a strengthening agent solution for 30 hours.

[0042] Step S5, putting the soaked aggregate particles into a drying oven for drying, and setting the drying temperature of the oven to 80° C. to obtain reinforced recycled aggregate particles.

[0043] The reinforced recycled aggregate particles prepared in Example 1 were tested with natural aggregate, unreinforced waste aggregate (blank group), and other waste aggregates with common reinforcement methods (comparative example) as follows: (1) The comparison results of the technical indicators of aggregate particles are shown in Table 1.

[0044] Table 1 Comparison of technical indicators of aggregate particles

[0045] (2) The comparison results of technical indicators of asphalt mixture prepared by aggregate particles are shown in Table 2.

[0046] Table 2 Comparison of technical indicators of asphalt mixture

[0047] Therefore, the present invention adopts the above-mentioned method for strengthening waste construction waste particles, adopts a composite strengthening method, and uses multi-angle composite strengthening of physical grinding, chemical filling and organic strengthening to achieve the regeneration and strengthening of waste construction waste particles.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for strengthening waste construction waste particles, characterized in that: The following steps are involved: Step S1, selecting waste construction waste; Step S11, crushing the waste construction waste to obtain aggregate particles; Step S12, removing rubber and wood waste contained in the aggregate particles; Step S13, screening through a standard square hole sieve, retaining aggregate particles with a particle size of ≥2.35 mm for subsequent strengthening; Step S2, grinding aggregate particles; The aggregate particles retained in step S1 are placed in a grinder or an abrasion tester to grind the cement mortar attached to the surface of the aggregate; the grinding is performed at a high temperature of 300° C. while grinding the surface of the aggregate; Step S3, preparing a KH-550 enhancer solution; Step S4, soaking the aggregate particles polished in step S2 in a strengthening agent solution for more than 24 hours; Step S5: putting the soaked aggregate particles into a drying box for drying to obtain reinforced recycled aggregate particles.

2. The method for strengthening waste construction waste particles according to claim 1, characterized in that: In step S1, the aggregate particles include waste aggregate and cement mortar particles; the aggregate particles with a particle size of 2.35 mm to 16.00 mm are retained by a standard square hole sieve.

3. The method for strengthening waste construction waste particles according to claim 2, characterized in that: Step S2 specifically includes: Step S21, putting the aggregate particles retained in step S1 into an oven at a weight of 15 kg / portion and heating to 250° C. to 300° C.; Step S22, after heating, place the mixture in a grinder or abrasion tester, set the rotation speed of the instrument to 50 r / min, and take out the aggregate particles after running for 5 minutes; Step S23, repeating steps S21 and S22, sieving and polishing again to remove cement mortar attached to the surface, and removing surface dust by washing with water, and then putting into an oven to dry.

4. The method for strengthening waste construction waste particles according to claim 1, characterized in that: In step S3, the reinforcing agent is silane coupling agent KH-550, and the concentration of the configured solution is 5% to 10%.

5. The method for strengthening waste construction waste particles according to claim 1, characterized in that: In step S5, the oven drying temperature is set to 80°C.

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