Pavement base material and pavement roadbed material based on drilling solid waste water-based mud

Abstract

The invention belongs to the technical field of drilling solid waste, and particularly relates to a pavement base material and a pavement roadbed material based on drilling solid waste water-based mud. The pavement base material based on the drilling solid waste water-based mud comprises the following components in percentage by weight: 75-80% of drilling solid waste water-based mud, 12-15% of gravel, 4-6% of fly ash and 4-6% of cement. The pavement roadbed material based on the drilling solid waste water-based mud comprises the following components in percentage by weight: 85-91% of drilling solid waste water-based mud, 5-10% of white mud and 4-6% of cement. According to the invention, the utilization of the drilling solid waste water-based mud is realized. The pavement base material and the pavement subgrade material obtained by the invention both have good performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of drilling solid waste, and particularly relates to a pavement base material and a roadbed material for a road surface based on water-based mud of drilling solid waste. Background Art

[0002] Water-based drilling solid waste includes waste water-based drilling mud and drill cuttings. Water-based drilling mud is a sol suspension system with water as the dispersion medium and clay, weighting agent and various chemical treatment agents as the dispersed phase. Its main components are water, clay, weighting agent and various chemical treatment agents, etc. The current resource recovery efficiency of water-based drilling mud is not high. Therefore, realizing the disposal and utilization of water-based mud of drilling solid waste is beneficial to energy conservation and emission reduction. Summary of the Invention

[0003] In order to solve the deficiencies of the prior art, the present invention provides a pavement base material and a roadbed material for a road surface based on water-based mud of drilling solid waste.

[0004] The technical solution provided by the present invention is as follows:

[0005] A pavement base material based on water-based mud of drilling solid waste, comprising the following components in weight percentage: 75-80% of water-based mud of drilling solid waste, 12-15% of crushed stone, 4-6% of fly ash, and 4-6% of cement.

[0006] Specifically: the water-based mud of drilling solid waste is the water-based mud of drilling solid waste pretreated by mixing PAC (polyaluminium chloride), and the weight admixture of PAC is 1.0-2.0%.

[0007] Based on the above technical solution, the COD index of the water-based mud can be reduced from 302 mg / L to 106-152 mg / L, and the effect is obvious.

[0008] Specifically, the crushed stone includes:

[0009] Crushed stone with a particle size of 5-10 mm, accounting for 4-5% of the pavement base material;

[0010] Crushed stone with a particle size of 10-20 mm, accounting for 4-5% of the pavement base material;

[0011] Crushed stone with a particle size of 20-30 mm, accounting for 4-5% of the pavement base material.

[0012] Based on the above technical solution, the unconfined compressive strength of the material can be improved to meet the pavement base strength requirements of secondary or lower grade roads with medium / light traffic; the subbase strength requirements of expressways / first-class roads with medium / light traffic; the pavement base strength requirements of secondary or lower grade roads.

[0013] Specifically: the fly ash is first-class fly ash.

[0014] Specifically: the cement is 42.5 ordinary Portland cement, and its performance indicators are as follows:

[0015] Setting time and strength of cement

[0016]

[0017] The performance of the road base material based on drilling solid waste water-based mud provided by the present invention is as follows:

[0018] Compaction characteristics: The optimum moisture content of water-based mud pavement base material is 9.2%, and the maximum dry density is 2.365g / cm 3 .

[0019] Strength: The 7-day unconfined compressive strength of the water-based mud pavement base specimen is 2.77MPa. It meets the pavement base strength requirements for medium / light traffic on Class II / Second II highways, the pavement subbase strength requirements for medium / light traffic on expressways / Class I highways, and the pavement base strength requirements for Class II / Second II highways.

[0020] Water stability: Under the action of dry-wet cycle, the water stability coefficient of the water-based mud pavement base specimen is 1.31, the softening coefficient is greater than 85%, and the water stability is good. Under the action of full immersion, the water stability coefficient of the water-based mud pavement base specimen is 1.01, the softening coefficient is greater than 85%, and the water stability is good.

[0021] Frost resistance: Under the action of freeze-thaw cycles, the residual compressive strength ratio of the water-based mud pavement base specimen is 88.57%, which is greater than 85%. Cement-based pavement base materials have strong frost resistance and are suitable for use in low temperature areas.

[0022] Anti-scouring property: The scouring rate of cement-based pavement base specimens is higher than that of ordinary cement-stabilized crushed stone, reaching 0.396%. However, the scouring rate is not high, which can be considered as good water stability, and it is estimated that it has good anti-scouring performance in actual construction.

[0023] After pretreatment of the water-based mud raw materials, the important indicators of the cement-based pavement base materials did not exceed the limit values, and the environmental risks were controllable.

[0024] The present invention also provides a roadbed material based on drilling solid wastewater-based mud, which comprises the following components in percentage by weight: 85-91% of drilling solid wastewater-based mud, 5-10% of white mud, and 4-6% of cement.

[0025] Specifically: the drilling solid wastewater-based mud is the drilling solid wastewater-based mud pretreated by mixing with PAC, and the weight content of PAC is 1.0-2.0%.

[0026] Specifically: the white mud is papermaking white mud.

[0027] Specifically: The cement is 42.5 ordinary Portland cement.

[0028] The performance of the pavement subgrade material based on drilling solid waste water-based mud provided by the present invention is as follows:

[0029] Compaction characteristics: The optimum moisture content of the water-based mud subgrade material is 23%, and the maximum dry density is 1.76 g / cm 3 .

[0030] Strength: R7 of the water-based mud subgrade material is 2.77 MPa, and the strength meets the requirements for the pavement base course strength of secondary / secondary or lower highways with medium / low traffic; the requirements for the sub-base course strength of expressways / first-class highways with medium / low traffic; and the requirements for the pavement base course strength of secondary / secondary or lower highways.

[0031] Volume stability: In the unloaded saturated one-dimensional expansion test, the vertical expansion deformation of the water-based mud subgrade material is about 3.9%, and the volume stability is good.

[0032] Water stability: After 7 wet-dry cycles, the water stability coefficient of the water-based mud subgrade material is 1.04, and the softening coefficient is greater than 85%, indicating good water stability. After 7 days of full immersion, the water stability coefficient of the water-based mud subgrade material is 0.87, and the softening coefficient is greater than 85%, indicating good water stability.

[0033] Frost resistance: After 7 freeze-thaw cycles, the unconfined compressive strength of the water-based mud subgrade material decreases significantly. The strength ratio FTR7 after 7 freeze-thaw cycles is 38.6%, that is, compared with the specimens cured under standard curing conditions for 28 days, the unconfined compressive strength decreases by 61.4%. The frost resistance performance is not good, and it is not recommended to be used in cold regions.

[0034] CBR value: The CBR value of the water-based mud subgrade material is 10.17, meeting the CBR value requirements for subgrade fillers of all grades of highways.

[0035] Resilient modulus: The resilient modulus of the water-based mud subgrade material reaches 79.24 MPa, which can meet the resilient modulus requirements for all traffic grades of highway pavements.

[0036] After the pretreatment of the water-based mud raw materials, all the indexes of the water-based mud subgrade material do not exceed the limit values, and the environmental risks are controllable.

[0037] The present invention realizes the utilization of drilling solid waste water-based mud. The pavement base course material and the pavement subgrade material obtained by the present invention both have good performance. Detailed implementation manners

[0038] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0039] Unless otherwise specified, the test methods used in the examples are conventional methods; the materials, reagents, etc. used are reagents and materials that can be obtained commercially unless otherwise specified.

[0040] The cement used is Huaxin Fort brand 42.5 ordinary Portland cement.

[0041] The fly ash used is the first-class fly ash from Henan Hengyuan New Materials Co., Ltd.

[0042] The water-based mud for drilling solid waste used is the water-based mud provided by Nanxi Shunfa New Building Materials Technology Co., Ltd.

[0043] The crushed stones used are the crushed stones provided by Nanxi Shunfa New Building Materials Technology Co., Ltd.

[0044] The white mud used is the papermaking white mud provided by Sichuan Ying'an Technology Co., Ltd.

[0045] Example 1

[0046] The road base material based on the water-based mud of drilling solid waste includes the following components in weight percentage: 77.5% of the water-based mud of drilling solid waste, 13.5% of crushed stones, 5% of fly ash, and 4% of cement. Mix each component evenly to obtain it.

[0047] The water-based mud of drilling solid waste is the water-based mud of drilling solid waste pretreated by mixing PAC, and the dosage of PAC is 1.5%.

[0048] The crushed stones include:

[0049] The crushed stones with a particle size of 5 - 10 mm account for 4.5% of the road base material;

[0050] The crushed stones with a particle size of 10 - 20 mm account for 4.5% of the road base material;

[0051] The crushed stones with a particle size of 20 - 30 mm account for 4.5% of the road base material.

[0052] The fly ash is the first-class fly ash.

[0053] The cement is 42.5 ordinary Portland cement.

[0054] Example 2

[0055] On the basis of Example 1, adjust the water-based mud of drilling solid waste to 76.5%, crushed stones to 13.5%, fly ash to 5%, and adjust the cement to 5%. The performance in all aspects is similar.

[0056] Example 3

[0057] On the basis of Example 1, the water-based mud of drilling solid waste is adjusted to 76.5%, crushed stone to 13.5%, fly ash to 6%, and cement to 4%, and the performance in all aspects is close.

[0058] Various tests are carried out on the pavement base course materials based on the water-based mud of drilling solid waste obtained in Example 1.

[0059] Compaction test, pre-added water content 1% - 4%:

[0060]

[0061]

[0062] Due to the relatively large water content range of the water-based mud, the water content of the water-based mud in the compaction test batch is 15%, the external water addition amount is 3%, and the optimum water content of the actually cement-stabilized water-based mud crushed stone is 9.2%. When using the heavy compaction method to determine the maximum dry density, the test result is multiplied by a correction coefficient of 1.03 as the standard maximum dry density. Therefore, the corrected maximum dry density is 2.365 g / cm 3 。

[0063] The 7-day unconfined compressive strength data of the pavement base course material specimens based on the water-based mud of drilling solid waste obtained in Example 1 are tested.

[0064]

[0065] The unconfined compressive strength data at different ages are tested.

[0066]

[0067] It can be seen that the 7-day unconfined compressive strength is 2.77 MPa, and the 14-day and 28-day unconfined compressive strengths are excellent, which can meet the pavement base course strength requirements for medium / low traffic on secondary or lower-class roads; the pavement sub-base course strength requirements for medium / low traffic on expressways / first-class roads; and the pavement base course strength requirements for secondary or lower-class roads.

[0068] The water stability test is carried out on the pavement base course material specimens based on the water-based mud of drilling solid waste obtained in Example 1.

[0069] The results of the dry-wet cycle test are as follows:

[0070]

[0071] It can be seen that after 7 dry-wet cycles, its unconfined compressive strength increases, the water stability coefficient is 1.31, and the softening coefficient is greater than 85%, indicating good water stability.

[0072] The results of the water stability test under full immersion are as follows:

[0073]

[0074] It can be seen that after 7 days of full immersion, its unconfined compressive strength has increased, the water stability coefficient is 1.01, the softening coefficient is greater than 85%, and the water stability is good.

[0075] The road base material specimens of the drilling solid waste water-based mud obtained in Example 1 were tested for frost resistance.

[0076] The results of the freeze-thaw cycle test are as follows:

[0077]

[0078] It can be seen that under the action of the freeze-thaw cycle, the strength of the specimen does not decrease significantly, and the residual compressive strength ratio is 88.57%, which is greater than 85%. According to the results of the freeze-thaw cycle test, the cement-based road base material has strong frost resistance and is suitable for use in low-temperature regions.

[0079] The road base material specimens of the drilling solid waste water-based mud obtained in Example 1 were tested for erosion resistance.

[0080] The results of the erosion resistance test are as follows:

[0081] Specimen type Specimen number Scouring material mass (g) Scouring mass loss (%) Specimen of Example 1 Example 1 26.6 0.3961

[0082] It can be seen that the erosion rate is low and the water stability is good.

[0083] Example 4

[0084] The pavement subgrade material based on drilling solid waste water-based mud comprises the following components in weight percentage: 90% of drilling solid waste water-based mud, 5% of white mud, and 5% of cement. Mix the components evenly to obtain it.

[0085] The drilling solid waste water-based mud is the drilling solid waste water-based mud pretreated by mixing PAC, and the dosage of PAC is 1.5%.

[0086] The white mud is papermaking white mud.

[0087] The cement is 42.5 ordinary portland cement.

[0088] Example 5

[0089] On the basis of Example 4, 89% of drilling solid waste water-based mud, 5% of white mud, and the cement is adjusted to 6%, and the performances in all aspects are close.

[0090] Example 6

[0091] On the basis of Example 4, 85% of drilling solid waste water-based mud, the white mud is adjusted to 10%, and 5% of cement, and the performances in all aspects are close.

[0092] Perform various tests on the road base materials based on drilling solid waste water-based mud obtained in Example 4.

[0093] Compaction test, pre-added water content 3% - 7%:

[0094] Pre-added water content (%) 3％ 4％ 5％ 6％ 7％ Measured water content (%) 19.7 21.9 21.7 22.0 23.4 <![CDATA[Dry density (g / cm 3 )]]> 1.674 1.667 1.706 1.707 1.615

[0095] It can be seen that the optimum moisture content of the pavement subgrade material is 23%. When determining the maximum dry density by the heavy compaction method, a correction factor of 1.03 is used as the standard maximum dry density, and the maximum dry density is 1.76 g / cm 3 .

[0096] Perform strength tests on the specimens of the road base materials based on drilling solid waste water-based mud obtained in Example 4.

[0097] The 7-day unconfined compressive strength data are as follows:

[0098]

[0099] The unconfined compressive strength data at different ages are as follows:

[0100]

[0101] It can be seen that when the cement content is 10%, the 7-day unconfined compressive strength is about 4.98 MPa, which has reached the strength requirement for the road base of heavy traffic expressways. Using it as a subgrade material is a waste and can be optimized; when the cement content is 5%, the 7-day unconfined compressive strength is 2.77 MPa, and the strength meets the strength requirements for the road base of medium / light traffic on secondary / secondary roads below; the strength requirements for the subbase of medium / light traffic on expressways / first-class roads; the strength requirements for the road base of secondary / secondary roads below. R28 is 2.93 MPa, an increase of 6% compared to R7.

[0102] Perform volume stability tests on the specimens of the road base materials based on drilling solid waste water-based mud obtained in Example 4.

[0103] Prepare core specimens and conduct a one-dimensional swelling test under no load and saturated water. The volume stability test data are as follows:

[0104]

[0105] It can be seen that there is no obvious volume expansion of the specimen, the vertical expansion deformation is about 3.9%, the whole is intact without defects, and the volume stability is good.

[0106] Perform water stability tests on the specimens of the road base materials based on drilling solid waste water-based mud obtained in Example 4.

[0107] The results of the wet-dry cycle test are as follows:

[0108]

[0109] It can be seen that after 7 wet-dry cycles, its unconfined compressive strength has increased, the water stability coefficient is 1.04, the softening coefficient is greater than 85%, and the water stability is good.

[0110] The test results of the unconfined compressive strength after full immersion and wet-dry cycle are as follows:

[0111]

[0112] It can be seen that after 7 days of full immersion, its unconfined compressive strength has increased, the water stability coefficient is 0.87, the softening coefficient is greater than 85%, and the water stability is good.

[0113] The CBR value test was carried out on the pavement base course material specimens based on drilling solid waste water-based mud obtained in Example 4.

[0114] The results of the CBR penetration test are as follows:

[0115]

[0116] It can be seen that the CBR value of the specimen is 10.17. Referring to the "Technical Specification for Highway Subgrade Construction" (JTGT 3610-2019), it meets the CBR value requirements of the roadbed fill for all grades of highways.

[0117] The resilient modulus test was carried out on the pavement base course material specimens based on drilling solid waste water-based mud obtained in Example 4.

[0118] The test data are as follows:

[0119]

[0120] It can be seen that the resilient modulus reaches 79.24 MPa, which can meet the resilient modulus requirements of all traffic grades of highway pavements.

[0121] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A road base material based on water-based mud from drilling solid waste water, characterized in that, Comprising the following components in weight percentages: 75 - 80% of drilling solid waste water-based mud, 12 - 15% of crushed stone, 4 - 6% of fly ash, and 4 - 6% of cement.

2. The road base material based on water-based mud of drilling solid waste water according to claim 1, characterized in that: The drilling solid waste water-based mud is the drilling solid waste water-based mud pretreated by mixing with PAC, and the dosage of PAC is 1.0 - 2.0%.

3. The road base material based on the water-based mud of drilling solid waste according to claim 1, characterized in that, The crushed stone includes: Crushed stone with a particle size of 5 - 10 mm, accounting for 4 - 5% of the road base material; Crushed stone with a particle size of 10 - 20 mm, accounting for 4 - 5% of the road base material; Crushed stone with a particle size of 20 - 30 mm, accounting for 4 - 5% of the road base material.

4. The road base material based on water-based mud of drilling solid waste water according to claim 1, characterized in that: The fly ash is grade-I fly ash.

5. The road base material based on water-based mud of drilling solid waste water according to claim 1, characterized in that: The cement is 42.5 ordinary Portland cement.

6. A pavement subgrade material based on water-based mud from drilling solid waste water, characterized in that, Comprising the following components in weight percentages: 85 - 91% of drilling solid waste water-based mud, 5 - 10% of white mud, and 4 - 6% of cement.

7. The pavement subgrade material based on the water-based mud of drilling solid waste water according to claim 6, characterized in that: The drilling solid waste water-based mud is the drilling solid waste water-based mud pretreated by mixing with PAC, and the dosage of PAC is 1.0 - 2.0%.

8. The pavement subgrade material based on the water-based mud of drilling solid waste water according to claim 6, characterized in that: The white mud is paper-making white mud.

9. The pavement subgrade material based on the water-based mud of drilling solid waste water according to claim 6, characterized in that: The cement is 42.5 ordinary Portland cement.

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