A construction method for paving a road base using magnesium slag-based cementitious materials

Abstract

The present invention discloses a construction method for paving a road base using a magnesium slag-based cementitious material, comprising the following steps: 1. preparatory work before construction; 2. crushing, recycling, and screening the original road base to obtain old road materials; 3. preparing cementitious materials using magnesium slag as a basic raw material; 4. preparing aggregate, wherein the aggregate includes old road materials; 5. mixing the cementitious materials and the aggregate according to a pre-designed formula, and adding water to prepare paving materials for paving the road base; 6. transporting the paving materials to the area to be paved for construction. The method of the present invention has simple steps, reasonable design, and convenient implementation. It can be effectively applied to the paving construction of the road base, mainly using old road materials, magnesium slag, and coal gasification slag as paving materials, greatly saving material costs, realizing the recycling of solid waste, having significant effects, and being easy to promote.

Description

Technical Field

[0001] The invention belongs to the technical field of resource recycling, and in particular relates to a construction method for paving a road base using a magnesium slag-based cementitious material. Background Art

[0002] With the development of the transportation industry, traffic volume and vehicle loads are increasing, and the number of heavy-loaded vehicles has also increased significantly. Roads are often damaged and have poor flatness due to rolling, affecting vehicle safety. Therefore, to meet the needs of transportation, higher requirements are placed on the bearing capacity of the road base in all aspects of construction, design, and construction.

[0003] Currently, road base reconstruction typically involves excavating and milling the original pavement, discarding it as waste, and then paving a new layer. This practice has three main consequences: a large amount of old material requires storage, wasting limited land resources; the storage of old material causes secondary environmental pollution; and cement-stabilized crushed stone is discarded as waste, a significant waste of resources.

[0004] At the same time, magnesium slag is an industrial waste slag sent by factories to refine magnesium. Many magnesium plants discard it as waste, especially some smaller-scale production enterprises. With the large-scale discharge and accumulation of magnesium slag, not only a large amount of land resources are occupied, but also the magnesium slag is flushed into rivers and lakes with rainwater, which has a great impact on crops and the surrounding environment, seriously endangering human health and the growth of crops. However, it has been found in practice that magnesium slag itself contains a high amount of free MgO, that is, an unstable component. Over time, the free MgO will gradually hydrate and expand, and the strength is insufficient. Therefore, it is necessary to eliminate the influence of the unstable component (free MgO), modify the magnesium slag, and improve the strength.

[0005] In today's world of increasing resource scarcity and environmental protection, traditional pavement base reconstruction is no longer able to meet the needs of the times, and its consequences run counter to the principles of a circular economy. If pavement waste and waste magnesium slag can be combined and recycled, it can not only reduce the use of new raw materials by reusing the old materials, but also delay excessive resource consumption and turn the waste into a renewable resource, achieving significant social, environmental, and economic benefits while realizing a true circular economy. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a construction method for paving the road base using magnesium slag-based cementitious materials in response to the above-mentioned deficiencies in the existing technology. The method has simple steps, reasonable design, and easy implementation. It can be effectively applied to the paving construction of the road base. It mainly uses old road materials, magnesium slag and coal gasification slag as paving materials, which greatly saves material costs, realizes the recycling of solid waste, has significant effects, and is easy to promote.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a construction method for paving a road base using a magnesium slag-based cementitious material, comprising the following steps:

[0008] Step 1: Preparation before construction;

[0009] Step 2: crushing, recycling and screening the original pavement base to obtain old pavement material;

[0010] Step 3: preparing a cementitious material using magnesium slag as a basic raw material;

[0011] Step 4: preparing aggregate, wherein the aggregate includes old road surface material;

[0012] Step 5: Mix the cementitious material and aggregate according to a pre-designed formula and add water to prepare a paving material for the road base;

[0013] Step 6: Transport the paving materials to the area to be paved for construction.

[0014] In the above-mentioned construction method of using magnesium slag-based cementitious materials for pavement base paving, the preparatory work before construction in step 1 specifically includes:

[0015] Step 101: Excavate the original road surface to determine the structure and material composition of the old road;

[0016] Step 102: Before construction, remove all debris, mud, and dust on the original road surface to ensure the cleanliness of the road surface;

[0017] Step 103: Pre-shape the old road to ensure that the road excavator can break it smoothly.

[0018] The above-mentioned construction method for paving the road base using magnesium slag-based cementitious materials, the magnesium slag in step three is optimized magnesium slag, the optimized magnesium slag is the magnesium slag after natural aging or hot pouring treatment of the modified magnesium slag, and the modified magnesium slag is the magnesium slag after the activity and stability of the magnesium slag produced by the Pijiang process of magnesium smelting is maintained.

[0019] The above-mentioned construction method for paving a road base using magnesium slag-based cementitious materials, the specific generation process of the modified magnesium slag includes: first, according to the weight percentage of each raw material in the modified magnesium smelting pellets, the raw materials are fed into a grinder for mixing and fine grinding, and then sieving, and pressing the screened material to obtain modified magnesium smelting pellets; then the modified magnesium smelting pellets are placed in a reduction tank, and reduced for 7h to 8h under the conditions of a vacuum degree of 5Pa to 10Pa and a temperature of 1200℃ to 1220℃. After the reduction is completed, the tank is opened to take out the crude magnesium ingot, and the magnesium slag in the reduction tank is scraped out to obtain block-shaped modified magnesium slag.

[0020] In the above-mentioned construction method for paving a road base using magnesium slag-based cementitious materials, the specific process of preparing the cementitious materials using magnesium slag as the basic raw material in step 3 includes:

[0021] Step 301: obtaining modified magnesium slag at a magnesium smelter and placing it in a slag yard for natural aging or hot pouring treatment to obtain optimized magnesium slag raw material;

[0022] Step 302: Pre-process the optimized magnesium slag raw material by coarse crushing and fine crushing to obtain optimized magnesium slag material;

[0023] Step 303: Pre-process the coal gasification coarse slag by screening, coarse crushing, and fine crushing to obtain coal gasification slag material;

[0024] Step 304: Mix the optimized magnesium slag material and the coal gasification slag material according to the pre-designed weight percentage, and grind them into a magnesium slag-based gelling material.

[0025] In the above-mentioned construction method for paving a road base using magnesium slag-based cementitious materials, the aggregate in step 4 also includes optimized magnesium slag raw materials.

[0026] In the above-mentioned construction method for paving a road base using magnesium slag-based cementitious materials, the specific process of preparing the aggregate in step 4 includes: when the particle size of the aggregate is greater than 10 mm, using a crusher to crush the aggregate to a particle size of less than 10 mm.

[0027] In the above-mentioned construction method for paving a road base using magnesium slag-based cementitious materials, the specific process of transporting the paving materials to the area to be paved for construction in step 6 includes:

[0028] Step 601: Construction layout;

[0029] A stake is set up every 15m to 20m on straight sections and every 5m on curved sections. Indicator stakes are set up outside the edge of the shoulder on both sides. The design high-hanging reference line of the edge is clearly marked on the indicator stakes, and the edge line is marked with white lime.

[0030] Step 602: fabric;

[0031] Step 603: mixing and leveling;

[0032] A regenerator is used for road mixing. The speed of the regenerator is controlled at 3m / min to 4m / min. A grader is used to scrape the road from both sides toward the center. Through the coordination of the grader and manual shaping, the horizontal slope, longitudinal slope, and flatness of the top surface of the base layer meet the specification requirements.

[0033] Step 604: rolling;

[0034] Proceed in the following order:

[0035] Pressure stabilization: Use a 20t double steel wheel roller to perform one pass of pressure stabilization, and control the roller's speed at 1.5km / h to 1.7km / h;

[0036] Light vibration rolling: Use a 20t roller to perform light vibration rolling twice, and control the roller's speed at 1.5km / h to 1.7km / h;

[0037] Strong vibration rolling: Use a 25t roller for four passes, with the roller's speed controlled at 1.8km / h to 2.2km / h;

[0038] Smooth surface rolling: Use a double steel wheel roller to roll 1 to 2 times, and control the roller speed at 1.5 km / h to 1.7 km / h;

[0039] Step 605: determining the loose laying coefficient;

[0040] Step 606: measuring thickness and compaction;

[0041] When the compaction degree is greater than 97% and the thickness does not meet the design requirements, the initial loose paving coefficient should be adjusted in time;

[0042] Step 607: health preservation;

[0043] Use natural watering for health preservation. The amount and frequency of watering should be based on ensuring that the surface is moist. The health preservation period is 7 days.

[0044] In the above-mentioned construction method for paving a road base using magnesium slag-based cementitious materials, the specific process of determining the loose paving coefficient in step 605 includes:

[0045] Step 60501: Set the initial loose paving coefficient and lay the paving material according to the initial loose paving coefficient.

[0046] Step 60502: Measure the elevation before paving and the elevation after paving every 10 m. The measurement points are staggered at random locations on both sides of the road centerline.

[0047] Step 60503: After compaction is completed, measure the post-compaction elevation at the same location as previously measured.

[0048] Step 60504: Calculate the actual loose laying coefficient.

[0049] Compared with the prior art, the present invention has the following advantages:

[0050] 1. The method of the present invention has simple steps, reasonable design and easy implementation.

[0051] 2. The present invention uses the old pavement materials obtained after crushing, recycling and screening the original pavement base as aggregate for re-paving, thereby realizing the recycling of old pavement materials. It can reduce the use of new raw materials by reusing old materials, and produce significant social, environmental and economic benefits.

[0052] 3. The present invention prepares cementitious materials based on magnesium slag as the basic raw material. By mixing optimized magnesium slag and coal gasification slag and grinding them into magnesium slag-based cementitious materials, the use of existing cement cementitious materials can be replaced or greatly reduced, the cost of cementitious materials can be greatly reduced, and the recycling of solid waste can be realized.

[0053] 4. The present invention utilizes the mutual excitation effect between optimized magnesium slag and coal gasification slag to achieve cement-like gelling effect, eliminate the influence of unstable components (free MgO) in the optimized magnesium slag, realize the modification of magnesium slag, and effectively improve the strength.

[0054] 5. The present invention can be effectively applied in the paving construction of road base, mainly using old road materials, magnesium slag and coal gasification slag as paving materials, which greatly saves material costs, realizes the recycling of solid waste, has significant effects, and is easy to promote.

[0055] In summary, the method of the present invention has simple steps, reasonable design, and easy implementation. It can be effectively applied in the paving construction of road base, mainly using old road materials, magnesium slag and coal gasification slag as paving materials, which greatly saves material costs and realizes the recycling of solid waste. The effect is significant and easy to promote.

[0056] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 is a flow chart of the method of the present invention;

[0058] Figure 2 This is a flow chart of the present invention for preparing a cementitious material using magnesium slag as a basic raw material;

[0059] Figure 3 It is a construction flow chart of the present invention. DETAILED DESCRIPTION

[0060] like Figure 1As shown, the construction method of the present invention for paving a road base using magnesium slag-based cementitious materials comprises the following steps:

[0061] Step 1: Preparation before construction;

[0062] In this embodiment, the preparatory work before construction specifically includes:

[0063] Step 101: Excavate the original road surface to determine the structure and material composition of the old road;

[0064] Step 102: Before construction, remove all debris, mud, and dust on the original road surface to ensure the cleanliness of the road surface;

[0065] Step 103: Pre-shape the old road to ensure that the road excavator can break it smoothly.

[0066] Step 2: crushing, recycling and screening the original pavement base to obtain old pavement material;

[0067] During the specific implementation, an excavator is used to dig up the old road base layer by layer. The old materials generated are transported to a designated location for recycling. Then, manual labor cooperates with loaders to clean up the debris and recycle it, and finally the materials are screened and prepared.

[0068] Step 3: preparing a cementitious material using magnesium slag as a basic raw material;

[0069] In this embodiment, the magnesium slag is optimized magnesium slag, which is the magnesium slag obtained by natural aging or hot pouring of the modified magnesium slag, and the modified magnesium slag is the magnesium slag obtained by activity preservation and stability preservation of the magnesium slag produced by the Pijiang process of magnesium smelting.

[0070] In this embodiment, the specific generation process of the modified magnesium slag includes: first, according to the weight percentage of each raw material in the modified magnesium smelting pellet, the raw materials are fed into the grinder for mixing and fine grinding, and then sieving, and the screened material is pressed to obtain modified magnesium smelting pellets; then the modified magnesium smelting pellets are placed in a reduction tank, and reduced for 7h to 8h under the conditions of a vacuum degree of 5Pa to 10Pa and a temperature of 1200℃ to 1220℃. After the reduction is completed, the tank is opened to take out the crude magnesium ingot, and the magnesium slag in the reduction tank is scraped out to obtain block-shaped modified magnesium slag.

[0071] In specific implementation, the weight percentages of the raw materials in the modified magnesium pellets are as follows: calcined white 81% to 82.8%, ferrosilicon 15% to 16.6%, fluorite 1.25% to 2.71%, and ferroboron alloy 0.23% to 0.29%, preferably calcined white (CaO / MgO molar ratio close to 1) 81%, ferrosilicon (containing Si content of about 75%) 16.5%, fluorite (CaF2 content in fluorite is not less than 95%) 2.25%, and ferroboron alloy 0.25%.

[0072] In this embodiment, Figure 2 As shown in FIG, the specific process of preparing cementitious materials using magnesium slag as the basic raw material includes:

[0073] Step 301: obtaining modified magnesium slag at a magnesium smelter and placing it in a slag yard for natural aging or hot pouring treatment to obtain optimized magnesium slag raw material;

[0074] Step 302: Pre-process the optimized magnesium slag raw material by coarse crushing and fine crushing to obtain optimized magnesium slag material;

[0075] During specific implementation, a jaw crusher is used to coarsely crush the blocky optimized magnesium slag in the optimized magnesium slag raw material; and a double-roll crusher is used to finely crush the coarsely crushed optimized magnesium slag to obtain optimized magnesium slag material.

[0076] Step 303: Pre-process the coal gasification coarse slag by screening, coarse crushing, and fine crushing to obtain coal gasification slag material;

[0077] Step 304: Mix the optimized magnesium slag material and the coal gasification slag material according to the pre-designed weight percentage, and grind them into a magnesium slag-based gelling material.

[0078] During specific implementation, the pre-designed weight percentages are as follows: 13% to 28% of optimized magnesium slag material, 65% to 75% of coal gasification slag material, preferably 25% of optimized magnesium slag material, and 75% of coal gasification slag material.

[0079] Generally, 5% or more free MgO remains in the modified magnesium slag. Since the free MgO in the modified magnesium slag hydrates slowly, if it is used directly as a cementitious material without treatment, Mg(OH)2 will be generated as the MgO slowly hydrates, causing volume expansion, resulting in a significant decrease in strength and posing a potential safety hazard. By subjecting the modified magnesium slag to natural aging or hot pouring treatment to form optimized magnesium slag, and then utilizing the mutual excitation effect between the optimized magnesium slag and coal gasification slag, a cement-like gelling effect is achieved, eliminating the influence of the unstable component (free MgO) in the optimized magnesium slag, and realizing the modification of the magnesium slag, the strength is effectively improved.

[0080] Step 4: preparing aggregate, wherein the aggregate includes old road surface material;

[0081] In this embodiment, the aggregate also includes optimized magnesium slag raw material.

[0082] In specific implementation, the aggregate can also be a combination of one or more of construction waste, coal gangue, aeolian sand, slag and desulfurized gypsum. When the old road material is insufficient, one or more of optimized magnesium slag raw materials, construction waste, coal gangue, aeolian sand, slag and desulfurized gypsum can also be added to the aggregate.

[0083] In this embodiment, when the particle size of the aggregate is greater than 10 mm, a crusher is used to crush the aggregate to a particle size of less than 10 mm.

[0084] Step 5: Mix the cementitious material and aggregate according to a pre-designed formula and add water to prepare a paving material for the road base;

[0085] Step 6: Transport the paving materials to the area to be paved for construction.

[0086] In this embodiment, Figure 3 As shown, the specific construction process includes:

[0087] Step 601: Construction layout;

[0088] A stake is set up every 15m to 20m on straight sections and every 5m on curved sections. Indicator stakes are set up outside the edge of the shoulder on both sides. The design high-hanging reference line of the edge is clearly marked on the indicator stakes, and the edge line is marked with white lime.

[0089] Step 602: fabric;

[0090] Step 603: mixing and leveling;

[0091] A regenerator is used for road mixing. The speed of the regenerator is controlled at 3m / min to 4m / min. A grader is used to scrape the road from both sides toward the center. Through the coordination of the grader and manual shaping, the horizontal slope, longitudinal slope, and flatness of the top surface of the base layer meet the specification requirements.

[0092] Step 604: rolling;

[0093] Proceed in the following order:

[0094] Pressure stabilization: Use a 20t double steel wheel roller to perform one pass of pressure stabilization, and control the roller's speed at 1.5km / h to 1.7km / h;

[0095] Light vibration rolling: Use a 20t roller to perform light vibration rolling twice, and control the roller's speed at 1.5km / h to 1.7km / h;

[0096] Strong vibration rolling: Use a 25t roller for four passes, with the roller's speed controlled at 1.8km / h to 2.2km / h;

[0097] Smooth surface rolling: Use a double steel wheel roller to roll 1 to 2 times, and control the roller's speed at 1.5 km / h to 1.7 km / h;

[0098] Step 605: determining the loose laying coefficient;

[0099] Step 60501: Set the initial loose paving coefficient and lay the paving material according to the initial loose paving coefficient.

[0100] During specific implementation, the initial loose laying coefficient is set to 1.25.

[0101] Step 60502: Measure the elevation before paving and the elevation after paving every 10 m. The measurement points are staggered at random locations on both sides of the road centerline.

[0102] Step 60503: After compaction is completed, measure the post-compaction elevation at the same location as previously measured.

[0103] Step 60504: Calculate the actual loose laying coefficient.

[0104] Step 606: measuring thickness and compaction;

[0105] When the compaction degree is greater than 97% and the thickness does not meet the design requirements, the initial loose paving coefficient shall be adjusted in time according to the actual loose paving coefficient obtained by calculation;

[0106] Step 607: health preservation;

[0107] Use natural watering for health preservation. The amount and frequency of watering should be based on ensuring that the surface is moist. The health preservation period is 7 days.

[0108] The present invention uses the old pavement materials obtained after crushing, recycling and screening the original pavement base as aggregate for re-paving, thereby realizing the recycling of old pavement materials. It can reduce the use of new raw materials by reusing old materials, and produce significant social, environmental and economic benefits.

[0109] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A construction method for paving a road base using magnesium slag-based cementitious materials, characterized in that: The following steps are involved: Step 1: Preparation before construction; Step 2: crushing, recycling and screening the original pavement base to obtain old pavement material; Step 3: preparing a cementitious material using magnesium slag as a basic raw material; The magnesium slag is optimized magnesium slag, which is obtained by naturally aging or hot pouring the modified magnesium slag, and the modified magnesium slag is obtained by subjecting the magnesium slag produced by the Pidgeon process to an activity-maintaining and stability-maintaining treatment. The specific production process of the modified magnesium slag includes: first, according to the weight percentage of each raw material in the modified magnesium smelting pellet, feeding the raw materials into a grinder, mixing and fine grinding, then screening, pressing the screened material to obtain the modified magnesium smelting pellet; then, placing the modified magnesium smelting pellet into a reduction tank, reducing it under the conditions of a vacuum degree of 5Pa-10Pa and a temperature of 1200°C-1220°C for 7h-8h, opening the tank after the reduction is completed to take out the crude magnesium ingot, and scraping out the magnesium slag in the reduction tank to obtain a block of modified magnesium slag; The weight percentages of the raw materials in the modified magnesium pellets are as follows: calcined ferrous 81% to 82.8%, ferrosilicon 15% to 16.6%, fluorite 1.25% to 2.71%, and ferroboron alloy 0.23% to 0.29%; The specific process of preparing the cementitious material based on magnesium slag includes: Step 301: obtaining modified magnesium slag at a magnesium smelter and placing it in a slag yard for natural aging or hot pouring treatment to obtain optimized magnesium slag raw material; Step 302: Pre-process the optimized magnesium slag raw material by coarse crushing and fine crushing to obtain optimized magnesium slag material; Step 303: Pre-process the coal gasification coarse slag by screening, coarse crushing, and fine crushing to obtain coal gasification slag material; Step 304: Mix the optimized magnesium slag material and the coal gasification slag material according to a pre-designed weight percentage, and grind them into a magnesium slag-based gelling material; The pre-designed weight percentages are as follows: optimized magnesium slag 13% to 28%, coal gasification slag 65% to 75%; Generally, 5% or more free MgO remains in modified magnesium slag. Since the free MgO in the modified magnesium slag hydrates slowly, if it is used directly as a cementitious material without treatment, Mg(OH)2 will be generated as the MgO slowly hydrates, causing volume expansion, resulting in a significant decrease in strength and posing a potential safety hazard. By subjecting the modified magnesium slag to natural aging or hot pouring treatment to form optimized magnesium slag, and then utilizing the mutual excitation effect between the optimized magnesium slag and coal gasification slag, a cement-like gelling effect is achieved, eliminating the influence of free MgO in the optimized magnesium slag, and thus modifying the magnesium slag to effectively improve strength. Step 4: preparing aggregate, wherein the aggregate includes old road surface material; Step 5: Mix the cementitious material and aggregate according to a pre-designed formula and add water to prepare a paving material for the road base; Step 6: Transport the paving materials to the area to be paved for construction.

2. A construction method for paving a road base using magnesium slag-based cementitious materials according to claim 1, characterized in that: The preparatory work before construction described in step 1 specifically includes: Step 101: Excavate the original road surface to determine the structure and material composition of the old road; Step 102: Before construction, remove all debris, mud, and dust on the original road surface to ensure the cleanliness of the road surface; Step 103: Pre-shape the old road to ensure that the road excavator can break it smoothly.

3. A construction method for paving a road base using magnesium slag-based cementitious materials according to claim 1, characterized in that: The aggregate in step 4 also includes optimized magnesium slag raw materials.

4. A construction method for paving a road base using magnesium slag-based cementitious materials according to claim 1, characterized in that: The specific process of preparing the aggregate in step 4 includes: when the particle size of the aggregate is greater than 10 mm, using a crusher to crush the aggregate to a particle size of less than 10 mm.

5. A construction method for paving a road base using magnesium slag-based cementitious materials according to claim 1, characterized in that: The specific process of transporting paving materials to the paving area for construction as described in step 6 includes: Step 601: Construction layout; A stake is set up every 15m to 20m on straight sections and every 5m on curved sections. Indicator stakes are set up outside the edge of the shoulder on both sides. The design high-hanging reference line of the edge is clearly marked on the indicator stakes, and the edge line is marked with white lime. Step 602: fabric; Step 603: mixing and leveling; A regenerator is used for road mixing. The speed of the regenerator is controlled at 3m / min to 4m / min. A grader is used to scrape the road from both sides toward the center. Through the coordination of the grader and manual shaping, the horizontal slope, longitudinal slope, and flatness of the top surface of the base layer meet the specification requirements. Step 604: rolling; Proceed in the following order: Pressure stabilization: Use a 20t double steel wheel roller to perform one pass of pressure stabilization, and control the roller's speed at 1.5km / h to 1.7km / h; Light vibration rolling: Use a 20t roller to perform light vibration rolling twice, and control the roller's speed at 1.5km / h to 1.7km / h; Strong vibration rolling: Use a 25t roller for four passes, with the roller's speed controlled at 1.8km / h to 2.2km / h; Smooth surface rolling: Use a double steel wheel roller to roll 1 to 2 times, and control the roller's speed at 1.5 km / h to 1.7 km / h; Step 605: determining the loose laying coefficient; Step 606: measuring thickness and compaction; When the compaction degree is greater than 97% and the thickness does not meet the design requirements, the initial loose paving coefficient should be adjusted in time; Step 607: health preservation; Use natural watering for health preservation. The amount and frequency of watering should be based on ensuring that the surface is moist. The health preservation period is 7 days.

6. A construction method for paving a road base using magnesium slag-based cementitious materials according to claim 5, characterized in that: The specific process of determining the loose-lay coefficient in step 605 includes: Step 60501: Set the initial loose paving coefficient and lay the paving material according to the initial loose paving coefficient. Step 60502: Measure the elevation before paving and the elevation after paving every 10 m. The measurement points are staggered at random locations on both sides of the road centerline. Step 60503: After compaction is completed, measure the post-compaction elevation at the same location as previously measured. Step 60504: Calculate the actual loose laying coefficient.

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