CN117107577A - Plant-mixing construction process of cement stabilized sand-doped laterite granules - Google Patents
Plant-mixing construction process of cement stabilized sand-doped laterite granules Download PDFInfo
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- CN117107577A CN117107577A CN202311310331.0A CN202311310331A CN117107577A CN 117107577 A CN117107577 A CN 117107577A CN 202311310331 A CN202311310331 A CN 202311310331A CN 117107577 A CN117107577 A CN 117107577A
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- doped
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- laterite
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- 239000004568 cement Substances 0.000 title claims abstract description 60
- 239000008187 granular material Substances 0.000 title claims abstract description 54
- 239000011504 laterite Substances 0.000 title claims abstract description 53
- 229910001710 laterite Inorganic materials 0.000 title claims abstract description 53
- 238000010276 construction Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 45
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 12
- 238000005056 compaction Methods 0.000 claims description 11
- 230000003068 static effect Effects 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 4
- 239000004746 geotextile Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000002688 soil aggregate Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/12—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for distributing granular or liquid materials
- E01C19/18—Devices for distributing road-metals mixed with binders, e.g. cement, bitumen, without consolidating or ironing effect
- E01C19/187—Devices for distributing road-metals mixed with binders, e.g. cement, bitumen, without consolidating or ironing effect solely for spreading-out or striking-off deposited mixtures, e.g. spread-out screws, strike-off boards
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to a plant-mixing construction process of cement stabilized sand-doped laterite granules, which ensures the large-scale construction of the cement stabilized sand-doped laterite granules through measures such as continuous mixing in a mixing field, a land leveler equipped with a GPS, a steel wheel and a rubber wheel road roller combination and the like. The cement stable sand-doped laterite granule constructed by the method not only can realize large-scale construction, but also has better integrity and compactness, and the construction method can realize good construction effect, can solve the defect that the construction of the pavement structure layer with large thickness can not be completed due to the lack of special equipment, can reduce the cost for purchasing special equipment, is a construction process with better technical economy, and can provide practical construction guidance for similar projects in African areas.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to a plant-mixing construction process of cement stabilized sand-doped laterite granules.
Background
The red soil aggregate has large reserves and wide distribution in the global scope, has higher strength due to the fact that the red soil aggregate contains a large amount of substances such as ferric oxide, calcium carbonate and the like in a natural state, has better bearing capacity after being compacted by a road roller, and is widely used in the road construction field around the world.
When the cement stabilized laterite granule is used for a road surface base layer, the cement stabilized laterite granule has larger viscosity after meeting water, is generally mixed with certain natural sand for use, and forms the cement stabilized sand-doped laterite granule, and is mainly used as a roadbed improvement layer between a soil base layer and a base layer in road surface engineering in African areas. In recent years, with the increase of road infrastructure construction projects of China for supporting africa countries, research and application of cement stabilized sand-doped laterite granules are also paid attention to gradually, but no complete construction process of a system exists at present. In particular, in african areas, cement stabilized sand-doped laterite granules are often used for paving roadbed improvement layers of more than 25cm, and the problems of material supply, paving and rolling of a large-thickness structure in continuous construction are particularly remarkable. Due to the fact that construction conditions in African areas fall behind and special equipment is lacking, how to finish construction operation of cement stable sand-doped laterite granules with large thickness by using existing construction equipment, continuity of construction is guaranteed, good implementation effect is achieved, and the construction method is a great problem to be solved urgently.
Disclosure of Invention
Aiming at the problems, the invention provides a plant-mixing construction process of cement stabilized sand-doped laterite granules, which ensures the large-scale construction of the cement stabilized sand-doped laterite granules by means of measures such as continuous mixing in a mixing field, a land leveler equipped with a GPS, a steel wheel and a rubber wheel road roller combination and the like. The main steps of the invention are as follows:
1) Mixing process
According to the mixing proportion design result of the cement stable sand-doped laterite granules, determining the mass percentages of cement, sand, laterite granules and water, setting the rotating speed of a cold material bin conveyor belt of a mixer, and the corresponding water consumption and cement dosage, and continuously mixing by using double mixing cylinders which are connected in series;
2) Transportation process
The self-unloading truck is used for loading cement stable sand-doped laterite granules from a conveyor belt of the mixer, 1/3 of the self-unloading truck is filled in a transport hopper, and the self-unloading truck is moved back and forth to continue loading until the self-unloading truck is filled, and the self-unloading truck is transported to a construction site after being covered by tarpaulin;
3) Spreading process
(1) Measuring surface elevation H of lower bearing layer by total station 1 A steel template with the same thickness as the designed thickness h of the cement stabilized sand-doped laterite granule is arranged on the road side,
(2) Determining a loose paving coefficient alpha, calculating to obtain the length x and the width y of the on-site material distribution square lattice of each dump truck according to the volume V of the dump truck transporting hopper and the design thickness h of the cement stable sand-doped laterite granules, marking the length boundary and the width boundary of the material distribution square lattice on the surface of a lower bearing layer by adopting cement powder, and adopting the calculation formula: v/(h x a) =xy,
(3) Pouring all cement stable sand-doped laterite granules in the dumper into a distribution square,
(4) Coarsely flattening the cement stabilized sand-doped laterite granules in each cloth square by adopting a loader until the surface has no obvious bulge and subsidence,
(5) Adjusting the height of the bottom of the land leveller blade with GPS to H 2 The position is higher than the height h x alpha of the surface of the lower bearing layer, then preliminary flattening is carried out according to the procedures of forward flattening for 1 time, raking teeth for 1 time and forward flattening for 1 time,
(6) After preliminary flattening is finished, the double-steel-wheel road roller is used for prepressing once in a front static back vibration mode,
(7) After the prepressing is finished, the height of the bottom of the land leveller blade with the GPS is adjusted to be H 3 The position is higher than the height h x (alpha+1)/2 of the surface of the lower bearing layer, and then accurate flattening is carried out according to the procedures of forward flattening for 1 time, reverse flattening for 1 time and forward flattening for 1 time;
4) Compacting process
(a) The cement stable sand-doped red soil granules which are precisely flattened are rolled for 4 to 6 times by adopting a double-steel-wheel road roller in a front static back vibration mode,
(b) After the compactness meets the requirement, adopting a land leveler with a GPS to carry out the scraping treatment, and adjusting the height of the bottom of the land leveler shovel blade to H 4 The position of the surface of the lower bearing layer is higher than the height h of the surface of the lower bearing layer, the surface is flattened according to the working procedure of forward flattening for 1 time and reverse flattening for 1 time,
(c) Finally, static pressure surface collection is carried out for 2 times from the side line to the central line by using a rubber-tyred roller;
5) Health preserving process
And after compaction is finished, immediately carrying out water sprinkling and curing on the cement stabilized sand-doped laterite granules, covering the cement stabilized sand-doped laterite granules with geotextile, and then carrying out water sprinkling and curing for more than 5 times each day until the upper material begins to be constructed.
And before the material distribution, sprinkling water on the top surface of the lower bearing layer for wetting, and then discharging.
The preliminary flattening should begin after the construction stage that completes the 50m rough flattening along the road strike direction.
After the paving was completed by 50m, the compacting operation was started.
The compactness meeting requirement is that 3 positions are randomly selected for compactness detection, and the average value of the compactness at 3 positions is larger than the design requirement, so that the compactness meeting requirement is shown.
The design requirement is a degree of compaction of 96%.
And (c) detecting and recording the compactness after the rolling of the double-steel-wheel road roller in the step (a) is finished, and carrying out the next step when the compactness meets the requirement, otherwise, increasing the rolling times of the double-steel-wheel road roller until the compactness meets the requirement.
The invention mainly utilizes measures of continuous mixing in a mixing field, a land leveler with a GPS, a steel wheel and a rubber wheel road roller combination and the like to ensure the large-scale construction of the cement stabilized sand-doped laterite granule, and the constructed structural layer has good integrity and compactness and has practical guiding significance for similar engineering in African areas.
Detailed Description
The concrete embodiment of the invention is described by taking the construction of a cement stabilized sand-doped laterite granule roadbed improvement layer of an expressway project in Africa as an example.
The design thickness h of the highway cement stabilized sand-doped laterite granule is 30cm, and the thickness is larger than 20cm, so that the highway cement stabilized sand-doped laterite granule belongs to a large-thickness structural layer, and the construction method in the invention is used in construction, and comprises the following specific steps:
1) Mixing process
The mass percentage of cement, sand, laterite granules and water determined by the mixing proportion design result of the cement stable sand-doped laterite granules is 2.3 percent: 12.1%:80.4%:5.2% and the mixing capacity of the mixer is 500t/h, the mass of each material required per hour is respectively as follows: 11.5t of cement, 60.5t of sand, 402t of laterite granules and 26t of water, the rotation speed of a conveyer belt from a laterite granule cooling bin to a mixing pot can be set to 6.7t/min, the rotation speed of a conveyer belt from a sand cooling bin to the mixing pot can be set to 1t/min, the water adding speed is 0.43t/min, the cement pumping speed is 0.19t/min, and the continuous mixing is carried out by using double mixing cylinders which are connected in series.
2) Transportation process
With a loading capacity of 25m 3 The dumper is used as a transport vehicle, and the loaded and mixed cement stabilized sand-doped laterite granules are transported to a construction site after being covered by tarpaulin.
3) Spreading process
Paving is carried out according to the following steps.
(1) Measuring the surface elevation H of the lower bearing layer by using a total station 1 A steel form with a thickness of 30cm was installed on the road side at 10 m.
(2) The loose paving coefficient alpha of the cement stable sand-doped laterite granules is 1.32 according to experience, and the total volume V of the cement stable sand-doped laterite granules loaded in a self-discharging truck transporting hopper is 25m 3 The area of the cloth square is: v/(hxα) =25/(0.30×1.32) =63.1 m 2 In order to facilitate construction, the length dimension x of the distribution square is 10m, the width dimension y of the on-site distribution square of each transport vehicle can be calculated to be 6.31m, and the length boundary and the width boundary of the distribution square are marked on the surface of the lower bearing layer by adopting cement powder.
(3) And (5) using a sprinkler to carry out sprinkling wetting on the top surface of the lower bearing layer. And then, pouring all the cement stabilized sand-doped laterite granules in each dumper into a distribution square.
(4) And (3) roughly flattening the cement stabilized sand-doped laterite granules in each cloth square by adopting a loader until the surface has no obvious bulge or subsidence.
(5) When a construction paragraph of rough flattening of 50m is completed along the direction of the road trend, a land leveler equipped with a GPS is adopted for preliminary flattening. When preliminary leveling, the elevation H of the bottom of the land leveler shovel blade is adjusted 2 Is controlled to be 39.6cm higher than the surface elevation of the lower bearing layer, namely the elevation H of the bottom of the grader blade at the moment 2 10.396m. And then, preliminary flattening is carried out according to the working procedures of forward flattening for 1 time, raking teeth for 1 time and forward flattening for 1 time.
(6) After preliminary flattening is completed, the double-steel-wheel road roller is used for prepressing once in a front static back vibration mode.
(7) After the prepressing is finished, the bottom elevation H of the land leveller blade with GPS is provided 3 Is controlled to be 34.8cm higher than the surface elevation of the lower bearing layer, namely the elevation H of the bottom of the grader blade at the moment 3 10.348m. And then precisely flattening according to the procedures of forward flattening for 1 time, reverse flattening for 1 time and forward flattening for 1 time.
4) Compacting process
After the paving is completed for 50m, the compaction operation is started, and the specific steps comprise:
(1) The cement stabilized sand-doped laterite granules which are precisely flattened are rolled for 5 times by using a double-steel-wheel road roller in a front static back vibration mode, and the road roller walks from a side line to a center line.
(2) After rolling, 3 positions are randomly selected for compactness detection, wherein the average value of the compactibility at 3 positions is 98.3 percent and is greater than 96 percent of design requirements, which indicates that the compactibility meets the requirements.
(3) Adopting a land leveler with a GPS to carry out leveling treatment, and carrying out the elevation H of the bottom of the shovel blade of the land leveler 4 Is controlled to be 30cm higher than the surface of the lower bearing layer, namely the height H of the bottom of the grader blade at the moment 4 10.30m. According to the procedure of forward leveling for 1 time and reverse leveling for 1 timeAnd (5) row flattening processing.
(4) Finally, the surface is folded 2 times by hydrostatic pressure from the side line to the center line by using a rubber-tyred roller.
5) Health preserving process
And after compaction is finished, immediately carrying out water spraying and curing on the cement stabilized sand-doped laterite granules, covering the cement stabilized sand-doped laterite granules with geotextile, and then carrying out water spraying and curing for 6 times each day until the upper material begins to be constructed.
After construction is completed, the average compaction degree of the highway cement stable sand-doped laterite granular material structure layer can reach 98.3 percent through detection, and is larger than the design requirement value by 96 percent, and the compactibility is good. Through core drilling detection, the average thickness of the cement stabilized sand-doped laterite granular structure layer is 30.2cm, the design thickness requirement is met, the bottom of the core sample is compact, no obvious honeycomb gaps are found, the integrity and the compactness are good, and the construction of the next procedure can be carried out; the highway with the invention has good construction quality due to the pavement structure layer. Therefore, the construction method can realize good construction effect, solve the defect that the construction of the pavement structure layer with large thickness can not be completed due to the lack of special equipment, reduce the expense of purchasing special equipment and be a construction process with better technical economy.
The invention mainly utilizes measures of continuous mixing in a mixing field, a land leveler with a GPS, a steel wheel and a rubber wheel road roller combination and the like to ensure the large-scale construction of the cement stabilized sand-doped laterite granule, and the constructed structural layer has good integrity and compactness, can effectively solve the large-scale construction problem of the cement stabilized sand-doped laterite granule with large thickness when special equipment is absent, has good integrity and compactness, and has practical guiding significance for similar engineering in African areas.
Claims (6)
1. A plant-mixing construction process of cement stabilized sand-doped laterite granules comprises the following steps: the mixing process, the transportation process, the paving process, the compacting process and the health preserving process comprise the following specific steps:
1) Mixing process
According to the mixing proportion design result of the cement stable sand-doped laterite granules, determining the mass percentages of cement, sand, laterite granules and water, setting the rotating speed of a cold material bin conveyor belt of a mixer, and the corresponding water consumption and cement dosage, and continuously mixing by using double mixing cylinders which are connected in series;
2) Transportation process
The self-unloading truck is used for loading cement stable sand-doped laterite granules from a conveyor belt of the mixer, 1/3 of the self-unloading truck is filled in a transport hopper, and the self-unloading truck is moved back and forth to continue loading until the self-unloading truck is filled, and the self-unloading truck is transported to a construction site after being covered by tarpaulin;
3) Spreading process
(1) Measuring surface elevation H of lower bearing layer by total station 1 A steel template with the same thickness as the designed thickness h of the cement stabilized sand-doped laterite granule is arranged on the road side,
(2) Determining a loose paving coefficient alpha, calculating to obtain the length x and the width y of the on-site material distribution square lattice of each dump truck according to the volume V of the dump truck transporting hopper and the design thickness h of the cement stable sand-doped laterite granules, marking the length boundary and the width boundary of the material distribution square lattice on the surface of a lower bearing layer by adopting cement powder, and adopting the calculation formula: v/(h x a) =xy,
(3) Pouring all cement stable sand-doped laterite granules in the dumper into a distribution square,
(4) Coarsely flattening the cement stabilized sand-doped laterite granules in each cloth square by adopting a loader until the surface has no obvious bulge and subsidence,
(5) Adjusting the height of the bottom of the land leveller blade with GPS to H 2 The position is higher than the height h x alpha of the surface of the lower bearing layer, then preliminary flattening is carried out according to the procedures of forward flattening for 1 time, raking teeth for 1 time and forward flattening for 1 time,
(6) After preliminary flattening is finished, the double-steel-wheel road roller is used for prepressing once in a front static back vibration mode,
(7) After the prepressing is finished, the height of the bottom of the land leveller blade with the GPS is adjusted to be H 3 The position is higher than the surface height h x (alpha+1)/2 of the lower bearing layer, and then the process steps of forward leveling for 1 time, reverse leveling for 1 time and forward leveling for 1 time are carried outAccurately flattening the rows;
4) Compacting process
(a) The cement stable sand-doped red soil granules which are precisely flattened are rolled for 4 to 6 times by adopting a double-steel-wheel road roller in a front static back vibration mode,
(b) After the compactness meets the requirement, adopting a land leveler with a GPS to carry out the scraping treatment, and adjusting the height of the bottom of the land leveler shovel blade to H 4 The position of the surface of the lower bearing layer is higher than the height h of the surface of the lower bearing layer, the surface is flattened according to the working procedure of forward flattening for 1 time and reverse flattening for 1 time,
(c) Finally, static pressure surface collection is carried out for 2 times from the side line to the central line by using a rubber-tyred roller;
5) Health preserving process
And after compaction is finished, immediately carrying out water sprinkling and curing on the cement stabilized sand-doped laterite granules, covering the cement stabilized sand-doped laterite granules with geotextile, and then carrying out water sprinkling and curing for more than 5 times each day until the upper material begins to be constructed.
2. The construction process according to claim 1, wherein the top surface of the lower bearing layer is sprayed with water and wetted before distribution, and then is discharged.
3. The construction process according to claim 1, wherein the preliminary flattening is started after a construction section in which 50m rough flattening is completed in the road trend direction.
4. The construction process according to claim 1, wherein the compacting operation is started after the paving is completed by 50 m.
5. The construction process according to claim 1, wherein the compactness meeting requirement is that 3 positions are randomly selected for compactness detection, and the average value of the 3 positions is larger than the design requirement, which indicates that the compactness meets the requirement.
6. The construction process according to claim 1, wherein after the compaction of the dual-steel-wheel road roller in the step (a) is completed, the compaction degree is detected and recorded, and the next step is performed when the compaction degree meets the requirement, otherwise, the number of times of compaction of the dual-steel-wheel road roller is increased until the compaction degree meets the requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311310331.0A CN117107577A (en) | 2023-10-11 | 2023-10-11 | Plant-mixing construction process of cement stabilized sand-doped laterite granules |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311310331.0A CN117107577A (en) | 2023-10-11 | 2023-10-11 | Plant-mixing construction process of cement stabilized sand-doped laterite granules |
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| CN117107577A true CN117107577A (en) | 2023-11-24 |
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| CN202311310331.0A Pending CN117107577A (en) | 2023-10-11 | 2023-10-11 | Plant-mixing construction process of cement stabilized sand-doped laterite granules |
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| CN (1) | CN117107577A (en) |
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