Method for determining amount of construction waste in cement stabilized macadam base

Abstract

The application belongs to the technical field of traffic civil engineering and specifically discloses a method for determining the amount of construction waste in a cement stabilized macadam base, which comprises the following steps: classifying construction waste into different grades according to the particle size of the construction waste; corresponding each grade of construction waste to a preset screen hole; respectively determining the passing rate of construction waste, the passing rate of new aggregate and the passing rate of macadam of the cement stabilized macadam corresponding to each preset screen hole; determining the amount of construction waste of the first grade according to the passing rate of macadam of the first grade and the first grade; determining the amount of new aggregate of the first grade according to the amount of construction waste, the passing rate of construction waste and the passing rate of new aggregate, and determining the amount of new aggregate of the first grade according to the amount of construction waste of the first grade and the amount of new aggregate; and preparing the cement stabilized macadam according to the amount of construction waste of the first grade and the amount of new aggregate of the first grade.

Description

Technical Field

[0001] This invention belongs to the field of transportation civil engineering application technology, and specifically discloses a method for determining the amount of construction waste in cement-stabilized crushed stone base courses. Background Technology

[0002] Construction waste has become one of the largest types of solid waste in my country. Its accumulation not only occupies a large amount of space but also has a series of harmful effects on the soil. Resource utilization of construction waste has become a critical issue that the industry urgently needs to address. The application of construction waste in cement-stabilized crushed stone has been validated; however, the physical and mechanical properties of construction waste are highly variable, and even with gradation design, unstable gradation can still occur. Furthermore, there are no systematic standards or regulations for the gradation design of cement-stabilized crushed stone mixed with construction waste, which also hinders the resource utilization of construction waste. Summary of the Invention

[0003] The purpose of this invention is to provide a method for determining the amount of construction waste in cement-stabilized crushed stone base courses, so as to solve the technical problem that the addition of construction waste to existing cement-stabilized crushed stone base courses results in unstable gradation, which affects the strength and stability of the cement-stabilized crushed stone base course.

[0004] This invention provides a method for determining the amount of construction waste used in cement-stabilized crushed stone base courses, including:

[0005] The construction waste is classified according to its particle size. Each grade of construction waste corresponds to a pre-set sieve size.

[0006] Determine the passing rates of construction waste, new aggregate, and cement-stabilized crushed stone for each preset screen size;

[0007] According to the File and No. The pass rate of the crushed stone in the first section is determined. Record the amount of construction waste used. ;

[0008] Based on the amount of construction waste, the throughput of construction waste, and the throughput of new aggregates, the previous... The amount of new aggregate used, and based on the previous The determination of the amount of construction waste and new aggregate used in the project. New aggregate usage;

[0009] according to Construction waste usage and The dosage of new aggregates is used to prepare cement-stabilized crushed stone.

[0010] Preferably, according to Construction waste usage and The specific dosage of new aggregates for preparing cement-stabilized crushed stone is as follows:

[0011] Each grade of composite material is formulated based on the amount of construction waste and new aggregate used in each grade.

[0012] Determine the material throughput rate corresponding to each preset sieve aperture;

[0013] Adjust the amount of new aggregate in the composite material and the amount of the first aggregate according to the crushed stone throughput and the composite material throughput. The amount of construction waste used is adjusted, and all the adjusted composite materials are mixed to obtain cement-stabilized crushed stone.

[0014] Preferably, the amount of new aggregate in the composite material and the amount of the first aggregate are adjusted according to the crushed stone throughput and the composite material throughput. The specific amount of construction waste used is as follows:

[0015] The error of each grade of composite material is determined based on the crushed stone throughput and the composite material throughput.

[0016] The total error of all synthetic materials is determined based on the error of each grade of synthetic material;

[0017] The error of each grade of the composite material and the total error are compared with the corresponding threshold, and the amount of new aggregate and the first grade of aggregate in the composite material are adjusted according to the comparison results. Record the amount of construction waste used.

[0018] Preferably, the amount of new aggregate and the amount of the first aggregate in the composite material are adjusted according to the comparison results. The specific amount of construction waste used is as follows:

[0019] If the error of any grade of composite material exceeds the corresponding threshold, the amount of new aggregate in that grade of composite material and the amount of the first grade of composite material will be adjusted according to the error. Record the amount of construction waste used.

[0020] Preferably, the amount of construction waste, the construction waste throughput, and the new aggregate throughput are determined based on the following: The specific amount of new aggregate used is as follows:

[0021] According to the Construction waste usage and first The pass rate of construction waste in the first batch was determined. The amount of construction waste passing through the archives. ;

[0022] According to the Construction waste throughput, first The amount of construction waste and new aggregate used in all previous sections was determined in section [number]. New aggregate throughput;

[0023] According to the New aggregate throughput and first The first batch of new material passing rate is determined by the merchants. New aggregate usage.

[0024] Preferably, If the value is 4, then the four preset sieve apertures are 2.36mm, 9.5mm, 16mm and 26.5mm respectively.

[0025] Preferably, the error thresholds for the four grades of synthetic materials are 1.0%, 1.5%, 1.5%, and 2.0% respectively; the total error threshold is 5%.

[0026] Preferably, according to Construction waste usage and After preparing cement-stabilized crushed stone using the new aggregate dosage, the following is also included:

[0027] Multiple specimens were prepared using the prepared cement-stabilized crushed stone and multiple preset cement dosages;

[0028] Determine the unconfined compressive strength of each specimen;

[0029] The amount of cement used in cement-stabilized crushed stone base course is determined based on the unconfined compressive strength.

[0030] Preferably, the preset cement dosages are 4.5%, 5%, 5.5% and 6%, respectively.

[0031] Preferably, when the cement-stabilized crushed stone base course is the subbase course, the preset cement dosages are 3.0%, 3.5%, 4.0% and 4.5%, respectively.

[0032] The method for determining the amount of construction waste in cement-stabilized crushed stone base course of the present invention has the following advantages compared with the prior art:

[0033] This invention calculates the amount of construction waste by controlling the passing rate of a preset sieve. The calculation process is simple, avoids gradation adjustment and frequent indoor mechanical strength tests, and reduces the gradation determination cycle of cement-stabilized crushed stone mixed with construction waste. Attached Figure Description

[0034] Figure 1 This is a flowchart illustrating the method for determining the amount of construction waste in a cement-stabilized crushed stone base course according to an embodiment of the present invention.

[0035] Figure 2 This is a comparison chart of the sieve passing rates of the target gradation before adjustment and the synthesized gradation in Embodiment 1 of the present invention.

[0036] Figure 3This is a comparison chart of the sieve passing rates of the target gradation and the synthetic gradation after the first adjustment in Embodiment 1 of the present invention.

[0037] Figure 4 This is a comparison chart of the sieve passing rates of the target gradation and the synthetic gradation after the second adjustment in Embodiment 1 of the present invention.

[0038] Figure 5 This is a comparison chart of the sieve passing rates of the target gradation and the synthetic gradation in Embodiment 2 of the present invention. Detailed Implementation

[0039] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0040] This invention provides a method for determining the amount of construction waste in a cement-stabilized crushed stone base course, such as... Figures 1 to 5 As shown, it includes:

[0041] Step 1: Sort construction waste according to its particle size. Each grade of construction waste corresponds to a pre-set sieve size. (The above is a partial translation of the original text.) It can be 4 or 6, preferably 4.

[0042] For example, construction waste is divided into four grades using a square-hole sieve. The first grade has a particle size range of ≤5mm, the second grade has a particle size range of 5~10mm, the third grade has a particle size range of 10~20mm, and the fourth grade has a particle size range of 20~30mm. Construction waste with a particle size exceeding 30mm must be discarded or re-crushed and graded before use.

[0043] In this embodiment of the invention, a sieving test was conducted on the above four grades of construction waste to obtain the gradation of the four grades of construction waste, and the preset sieve aperture corresponding to each grade of construction waste was determined. For example, the preset sieve aperture corresponding to the first grade of construction waste is 2.36 mm, the preset sieve aperture corresponding to the second grade of construction waste is 9.5 mm, the preset sieve aperture corresponding to the third grade of construction waste is 16 mm, and the preset sieve aperture corresponding to the fourth grade of construction waste is 26.5 mm.

[0044] Step 2: Determine the passing rate of construction waste, the passing rate of new aggregate, and the passing rate of cement-stabilized crushed stone for each preset screen size.

[0045] For example, a screening test was conducted on the above four grades of construction waste to obtain the gradation of the four grades of construction waste, and the passing rate of construction waste corresponding to the preset sieve aperture for each grade was calculated. The passing rate of construction waste corresponding to the preset sieve aperture for the first grade is denoted as... The passing rate of construction waste corresponding to the second preset screen aperture is recorded as... The passing rate of construction waste corresponding to the third preset sieve aperture is recorded as... The passing rate of construction waste corresponding to the fourth preset sieve aperture is recorded as... .

[0046] In this embodiment of the invention, a sieving test is conducted on the new aggregate to be used to determine its gradation composition. The particle size range of the first grade of new aggregate is ≤4.75mm, the second grade is 4.75~9.5mm, the third grade is 9.5~26.5mm, and the fourth grade is 26.5~31.5mm. Further, the passing rate of the new aggregate corresponding to each preset sieve aperture is calculated. The passing rate of the new aggregate corresponding to the first preset sieve aperture is denoted as... The new aggregate passing rate corresponding to the second preset screen aperture is recorded as... The pass rate of new aggregate corresponding to the third preset screen aperture is recorded as The pass rate of new aggregate corresponding to the fourth preset screen aperture is recorded as follows: .

[0047] In this embodiment of the invention, the crushed stone passing rate corresponding to each preset sieve aperture is determined based on the target gradation of cement-stabilized crushed stone. The crushed stone passing rate corresponding to the first preset sieve aperture is denoted as... The crushed stone passing rate corresponding to the second preset sieve aperture is recorded as... The crushed stone passing rate corresponding to the third preset screen aperture is recorded as... The crushed stone passing rate corresponding to the fourth preset screen aperture is recorded as... .

[0048] Step 3, according to the File and No. The pass rate of the crushed stone in the first section is determined. Record the amount of construction waste used. .

[0049] For example, the amount of construction waste used in the first tier is shown in formula (1):

[0050] (1)

[0051] In the formula, This is the first tier of construction waste usage; The first set of preset screen apertures (2.36mm) corresponds to the stone crushing rate.

[0052] The amount of construction waste used in the second tier is shown in formula (2):

[0053] (2)

[0054] In the formula, This is the second tier of construction waste usage; This is the crushed stone passing rate corresponding to the second preset sieve aperture of 9.5mm; The first tier of construction waste usage is represented by its value, which corresponds to the crushed stone passing rate of the first tier's preset sieve aperture of 2.36mm. equal; The first tier of new aggregate usage is shown in formula (3):

[0055] (3)

[0056] In the formula, The crushed stone passing rate corresponding to the preset sieve aperture of 2.36mm in the first stage; This is the first tier of construction waste usage; The passing rate of construction waste corresponding to the first preset screen aperture of 2.36mm; The first preset screen aperture of 2.36mm corresponds to the new aggregate throughput.

[0057] The amount of construction waste used in the third tier is shown in formula (4):

[0058] (4)

[0059] In the formula, This is the third tier of construction waste usage; The crushed stone passing rate corresponding to the preset sieve aperture of 16mm in the third gear; This is the crushed stone passing rate corresponding to the second preset sieve aperture of 9.5mm.

[0060] The amount of construction waste used in the fourth tier is shown in formula (5):

[0061] (5)

[0062] In the formula, This is the fourth tier of construction waste usage; The crushed stone passing rate corresponding to the preset sieve aperture of 26.5mm in the fourth gear; This is the crushed stone throughput rate corresponding to the preset sieve aperture of 16mm in the third gear.

[0063] Step 4: Determine the previous steps based on the amount of construction waste, the construction waste throughput rate, and the new aggregate throughput rate. The amount of new aggregate used, and based on the previous The determination of the amount of construction waste and new aggregate used in the project. New aggregate usage.

[0064] The determination of the first step is based on the amount of construction waste used, the rate of construction waste passing through, and the rate of new aggregate passing through. The specific amount of new aggregate used is as follows:

[0065] According to the Construction waste usage and first The product of the construction waste throughput rate of the first grade is used to determine the second grade. The amount of construction waste passing through the archives. ;

[0066] According to the Construction waste throughput, first The amount of construction waste and new aggregate used in all previous sections was determined in section [number]. New aggregate throughput;

[0067] According to the New aggregate throughput and first The first batch of new material passing rate is determined by the merchants. New aggregate usage.

[0068] For example, the amount of new aggregate used in the first stage is as shown in the above formula (3), and will not be repeated here.

[0069] The amount of new aggregate used in the second stage is shown in formula (6):

[0070] (6)

[0071] In the formula, This is the second tier of new aggregate usage; This is the crushed stone passing rate corresponding to the second preset sieve aperture of 9.5mm; This is the first tier of construction waste usage; This is the first tier of new aggregate usage; This is the second tier of construction waste usage; The passing rate of construction waste corresponding to the second preset screen aperture of 9.5mm; The second preset screen aperture of 9.5mm corresponds to the new aggregate throughput.

[0072] The dosage of the third grade of new aggregate is shown in formula (7):

[0073] (7)

[0074] In the formula, This is the third tier of new aggregate usage; The crushed stone passing rate corresponding to the preset sieve aperture of 16mm in the third gear; This is the first tier of construction waste usage; This is the first tier of new aggregate usage; This is the second tier of construction waste usage; This is the second tier of new aggregate usage; This is the third tier of construction waste usage; The passing rate of construction waste corresponding to the third preset screen aperture of 16mm; The third preset screen aperture of 16mm corresponds to the new aggregate throughput rate.

[0075] The amount of new aggregate used in the fourth grade is shown in formula (8):

[0076] (8)

[0077] In the formula, This is the first tier of construction waste usage; This is the first tier of new aggregate usage; This is the second tier of construction waste usage; This is the second tier of new aggregate usage; This is the third tier of construction waste usage; This is the third tier of new aggregate usage; This is the fourth tier of construction waste usage.

[0078] Step 5, according to Construction waste usage and The specific dosage of new aggregates for preparing cement-stabilized crushed stone is as follows:

[0079] Step 5.1: Prepare the composite material for each grade according to the amount of construction waste and new aggregate used in each grade.

[0080] Step 5.2: Determine the passing rate of the synthesized material corresponding to each preset sieve aperture.

[0081] For example, a sieving test was performed on each grade of synthetic material to obtain the passing rate of the synthetic material corresponding to the preset sieve aperture of 2.36 mm in the first grade. The second-stage preset sieve aperture of 9.5mm corresponds to a material throughput of [percentage missing]. The third preset sieve aperture of 16 mm corresponds to a material throughput of [percentage missing]. The fourth preset sieve aperture of 26.5 mm corresponds to a material throughput of [percentage missing]. .

[0082] Step 5.3: Adjust the amount of new aggregate and the amount of the first aggregate in the composite material according to the crushed stone throughput and the composite material throughput. The amount of construction waste used is adjusted, and all the adjusted composite materials are mixed to obtain cement-stabilized crushed stone.

[0083] The amount of new aggregate in the composite material and the amount of the first aggregate are adjusted according to the crushed stone throughput and the composite material throughput. The specific amount of construction waste used is as follows:

[0084] Step 5.3.1: Determine the error of each grade of composite material based on the crushed stone throughput and the composite material throughput, as shown in formula (9):

[0085] (9)

[0086] In the formula, This is the error for the first grade of synthetic material; This is for the error of the second-grade synthetic material; This is for the error of the third-grade synthetic material; This is the error for the fourth grade of synthetic material.

[0087] Step 5.3.2: Determine the total error of all synthetic materials based on the error of each grade of synthetic material, as shown in formula (10):

[0088] (10)

[0089] In the formula, This represents the total error of all synthetic materials.

[0090] Step 5.3.3: Compare the error and total error of each batch of composite material with the corresponding threshold, and adjust the amount of new aggregate and the amount of the first batch of composite material according to the comparison results. Record the amount of construction waste used.

[0091] In this embodiment of the invention, the error threshold for the first grade of synthetic material is 1.0%, the error threshold for the second grade of synthetic material is 1.5%, the error threshold for the third grade of synthetic material is 1.5%, the error threshold for the fourth grade of synthetic material is 2.0%, and the total error threshold is 5%. The error and total error of each grade of synthetic material are then compared with their corresponding thresholds. Specifically, it is determined whether the error and total error of each grade of synthetic material are both less than their corresponding thresholds. , , , , .

[0092] Furthermore, based on the comparison results, the amount of new aggregate and the first aggregate in the composite material were adjusted. The specific method for determining the amount of construction waste used in each grade is as follows: If the error in any grade of composite material exceeds the corresponding threshold, the amount of new aggregate used in that grade of composite material will be adjusted based on the error. The amount of construction waste used is shown in formula (11):

[0093] (11)

[0094] In the formula, For the first one that needs adjustment Adjusted amount of new aggregate in graded composite materials; This is the adjusted fourth tier of construction waste usage.

[0095] Following step 5, this embodiment of the invention further includes:

[0096] Step 6: Prepare multiple specimens using the prepared cement-stabilized crushed stone and multiple preset cement dosages.

[0097] For example, when the cement-stabilized crushed stone base course of this embodiment of the invention is a conventional base course, the preset cement dosages are 4.5%, 5%, 5.5%, and 6%, respectively. When the cement-stabilized crushed stone base course is a subbase course, the preset cement dosages are 3.0%, 3.5%, 4.0%, and 4.5%, respectively.

[0098] In this embodiment of the invention, a portion of cement-stabilized crushed stone prepared in step 5 is mixed with a portion of cement to prepare test specimens, resulting in multiple specimens. The specimens can be cylindrical specimens with a diameter × height of 150 mm × 100 mm, cured for 7 days under standard curing conditions (temperature 20 ± 2℃, humidity ≥ 95%).

[0099] Step 7: Determine the unconfined compressive strength of each specimen after curing.

[0100] Step 8: Determine the amount of cement used for cement-stabilized crushed stone base course based on the unconfined compressive strength.

[0101] When the cement-stabilized crushed stone base course is a conventional base course, the required unconfined compressive strength is 4.0 MPa; when the cement-stabilized crushed stone base course is a subbase course, the required unconfined compressive strength is 2.5 MPa. In this embodiment of the invention, the minimum cement dosage required to achieve the strength requirement is selected as the cement dosage used in the cement-stabilized crushed stone base course.

[0102] The effectiveness of the method of the present invention will be verified below with more specific embodiments.

[0103] Example 1

[0104] This embodiment uses construction waste collected in area A as an example to calculate the amount of construction waste used in cement-stabilized crushed stone base course. The specific steps are as follows:

[0105] S1. Classify construction waste into four grades for recycling: 0~5mm (R1), 5~10mm (R2), 10~20mm (R3), and 20~30mm (R4) using a square-hole screen. Construction waste with a particle size exceeding 30mm must be discarded.

[0106] S2. Screening tests were conducted on the four types of construction waste recycled materials R1 to R4, and the gradation of the four types of construction waste was obtained as shown in Table 1. The preset sieve apertures (key sieve apertures) for the graded construction waste were as follows: the preset sieve aperture for the first grade of construction waste was 2.36 mm, the preset sieve aperture for the second grade of construction waste was 9.5 mm, the preset sieve aperture for the third grade of construction waste was 16 mm, and the preset sieve aperture for the fourth grade of construction waste was 26.5 mm.

[0107] The above-mentioned preset sieve aperture throughput , , , The percentages are 65%, 95%, 69%, and 56%, respectively.

[0108] Table 1. Gradation of the four types of construction waste in Example 1

[0109]

[0110] S3. Conduct sieve analysis to determine the gradation composition of the new aggregate as shown in Table 2, and select the target gradation of cement-stabilized crushed stone as shown in Table 3.

[0111] Table 2. Gradation of the new aggregate in Example 1

[0112]

[0113] Table 3 Target gradation of cement-stabilized crushed stone in Example 1

[0114]

[0115] S4. Calculate and determine the amount of construction waste and new aggregate required for each grade.

[0116] The calculated amounts of construction waste are as follows: , , , The new aggregate usage amounts are as follows: , , , .

[0117] S5. Adjustment and optimization of the difference between the target gradation and the synthetic gradation of cement-stabilized crushed stone.

[0118] Calculated: , , , , Then there is , , , , As can be seen, the error of the second grade of aggregate exceeds the corresponding threshold, and the amount of new aggregate in the second grade needs to be adjusted. The comparison chart between the target gradation and the synthesized gradation at this time is shown below. Figure 2 .

[0119] Based on the above-mentioned composite material error and total error, the dosage of the second-grade new aggregate and the fourth-grade construction waste need to be adjusted. The adjusted dosages of construction waste are as follows: , , , The new aggregate usage amounts are as follows: , , , The adjusted target gradation and synthetic gradation are shown in the figure. Figure 3 .

[0120] Calculations show that the adjusted synthetic material error... , , , , It is evident that the error of the fourth grade of composite material exceeds the corresponding threshold of 2.0%, requiring further adjustment of the amount of new aggregate and construction waste used in the fourth grade.

[0121] The adjusted amounts of construction waste are as follows: , , , The new aggregate usage amounts are as follows: , , , The adjusted target gradation and synthetic gradation are shown in the figure. Figure 4 .

[0122] Calculations show the error after the second adjustment. , , , , All batches of synthetic material errors and total errors are less than the corresponding thresholds, therefore the adjustment is terminated.

[0123] S6. Conduct an indoor unconfined compressive strength test to determine the cement dosage.

[0124] After indoor unconfined compressive strength test, the unconfined compressive strength reached more than 2.5MPa (2.8MPa) after the cement dosage reached 4%, which met the strength requirements of the subbase. The cement dosage was determined to be 4%.

[0125] Example 2

[0126] This embodiment uses construction waste collected in region B as an example to calculate the amount of construction waste used in cement-stabilized crushed stone base course. The specific steps are as follows:

[0127] S1. Classify construction waste into four grades for recycling: 0~5mm (R1), 5~10mm (R2), 10~20mm (R3), and 20~30mm (R4) using a square-hole screen. Construction waste with a particle size exceeding 30mm must be discarded.

[0128] S2. Screening tests were conducted on the four types of construction waste R1 to R4 to obtain the gradation of the four types of construction waste as shown in Table 4. The preset sieve apertures (key sieve apertures) for the graded construction waste are as follows: the preset sieve aperture for the first grade of construction waste is 2.36 mm, the preset sieve aperture for the second grade of construction waste is 9.5 mm, the preset sieve aperture for the third grade of construction waste is 16 mm, and the preset sieve aperture for the fourth grade of construction waste is 26.5 mm.

[0129] The above-mentioned preset sieve holes , , , The percentages were 58%, 93%, 66%, and 52%, respectively.

[0130] Table 4. Gradation of the four types of construction waste in Example 2

[0131]

[0132] S3. Conduct sieve analysis to determine the gradation composition of the new aggregate as shown in Table 5, and select the target gradation of cement-stabilized crushed stone as shown in Table 6.

[0133] Table 5. Gradation of the new aggregate in Example 2

[0134]

[0135] Table 6 Target gradation of cement-stabilized crushed stone in Example 2

[0136]

[0137] S4. Calculate and determine the amount of construction waste and new aggregate required for each grade.

[0138] The calculated amounts of recycled construction waste are as follows: , , , The new aggregate usage amounts are as follows: , , , .

[0139] S5. Adjustment and optimization of the difference between the target gradation and the synthetic gradation of cement-stabilized crushed stone.

[0140] Calculated: , , , , All batches' composite material errors and total errors are less than the corresponding thresholds, therefore no adjustment is needed. See the comparison chart of the target gradation and the composite gradation. Figure 5 .

[0141] S6. Conduct an indoor unconfined compressive strength test to determine the cement dosage.

[0142] After indoor unconfined compressive strength test, the unconfined compressive strength reached 4.1 MPa after the cement dosage reached 5.5%, which is higher than 4.0 MPa and meets the strength requirements of the base layer. The cement dosage was determined to be 5.5%.

[0143] This invention calculates the amount of construction waste by controlling the passing rate of a preset sieve. The calculation process is simple, avoids gradation adjustment and frequent indoor mechanical strength tests, and reduces the gradation determination cycle of cement-stabilized crushed stone mixed with construction waste.

[0144] The above descriptions are merely a few embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any modifications or alterations made by those skilled in the art without departing from the scope of the technical solution of the present invention using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A method for determining the amount of construction waste in a cement-stabilized crushed stone base course, characterized in that, include: The construction waste is classified according to its particle size. Each grade of construction waste corresponds to a pre-set sieve size. Determine the passing rates of construction waste, new aggregate, and cement-stabilized crushed stone for each preset screen size; According to the File and No. The pass rate of the crushed stone in the first section is determined. Record the amount of construction waste used. ; Based on the amount of construction waste, the throughput of construction waste, and the throughput of new aggregates, the previous... The amount of new aggregate used, and based on the previous The determination of the amount of construction waste and new aggregate used in the project. New aggregate usage; according to Construction waste usage and The specific dosage of new aggregates for preparing cement-stabilized crushed stone is as follows: Each grade of composite material is formulated based on the amount of construction waste and new aggregate used in each grade. Determine the material throughput rate corresponding to each preset sieve aperture; Adjust the amount of new aggregate in the composite material and the amount of the first aggregate according to the crushed stone throughput and the composite material throughput. The amount of construction waste used is adjusted, and all the adjusted composite materials are mixed to obtain cement-stabilized crushed stone; Adjust the amount of new aggregate in the composite material and the amount of the first aggregate according to the crushed stone throughput and the composite material throughput. The specific amount of construction waste used is as follows: The error of each grade of composite material is determined based on the crushed stone throughput and the composite material throughput. The total error of all synthetic materials is determined based on the error of each grade of synthetic material; The error of each grade of the composite material and the total error are compared with the corresponding threshold, and the amount of new aggregate and the first grade of aggregate in the composite material are adjusted according to the comparison results. The amount of construction waste used; Based on the amount of construction waste, the throughput of construction waste, and the throughput of new aggregates, the previous... The specific amount of new aggregate used is as follows: According to the Construction waste usage and first The pass rate of construction waste in the first batch was determined. The amount of construction waste passing through the archives. ; According to the Construction waste throughput, first The amount of construction waste and new aggregate used in all previous sections was determined in section [number]. New aggregate throughput; According to the New aggregate throughput and first The first batch of new material passing rate is determined by the merchants. New aggregate usage.

2. The method for determining the amount of construction waste in cement-stabilized crushed stone base course according to claim 1, characterized in that, Based on the comparison results, adjust the amount of new aggregate and the first [unclear] in the composite material. The specific amount of construction waste used is as follows: If the error of any grade of composite material exceeds the corresponding threshold, the amount of new aggregate in that grade of composite material and the amount of the first grade of composite material will be adjusted according to the error. Record the amount of construction waste used.

3. The method for determining the amount of construction waste in cement-stabilized crushed stone base course according to claim 1, characterized in that, If the value is 4, then the four preset sieve apertures are 2.36mm, 9.5mm, 16mm and 26.5mm respectively.

4. The method for determining the amount of construction waste in cement-stabilized crushed stone base course according to claim 3, characterized in that, The error thresholds for the four grades of synthetic materials are 1.0%, 1.5%, 1.5%, and 2.0%, respectively; the total error threshold is 5%.

5. The method for determining the amount of construction waste in a cement-stabilized crushed stone base course according to any one of claims 1-4, characterized in that, according to Construction waste usage and After preparing cement-stabilized crushed stone using the new aggregate dosage, the following is also included: Multiple specimens were prepared using the prepared cement-stabilized crushed stone and multiple preset cement dosages; Determine the unconfined compressive strength of each specimen; The amount of cement used in cement-stabilized crushed stone base course is determined based on the unconfined compressive strength.

6. The method for determining the amount of construction waste in a cement-stabilized crushed stone base course according to claim 5, characterized in that, The preset cement dosages are 4.5%, 5%, 5.5% and 6%.

7. The method for determining the amount of construction waste in a cement-stabilized crushed stone base course according to claim 5, characterized in that, When cement-stabilized crushed stone base course is used as subbase course, the preset cement dosages are 3.0%, 3.5%, 4.0% and 4.5%, respectively.

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