A system for evaluating the improvement in the strength of the road substructure using bamboo fiber reinforcement.

Abstract

A system for evaluating the strength improvement of the roadbed through bamboo fiber reinforcement, consisting of: a) a material processing unit for producing a soil-bamboo fiber mixture, wherein the bamboo fibers are selected from the group consisting of Barak (Bambusa balcooa), Bari (Bambusa polymorpha), and Mritinga (Bambusa tulda), wherein the fibers have a length of 1.5 cm and a diameter of 2-3 mm and are incorporated at a rate of 3% of the dry weight of the soil; b) a compaction test facility configured to perform the Standard Proctor compaction test to determine the maximum dry density (MDD) and optimal moisture content (OMC); c) a load-bearing capacity test unit configured to perform CBR (California Bearing Ratio) tests, wherein the test unit is designed for CBR tests in both the impregnated and unimpregnated states; d) a subgrade preparation unit configured to prepare a subgrade test section for roadways, comprising layering and compacting the soil-bamboo fiber mixture in 150 mm thick layers to achieve a subgrade thickness of approximately 600 mm; and e) a deflection measuring unit for performing a falling weight deflectometer (FWD) test, wherein the deflection measuring unit comprises seven geophone sensors arranged at intervals of 0 mm, 300 mm, 600 mm, 900 mm, 1200 mm, 1500 mm and 1800 mm from the center of a load plate, and a load cell configured to apply a load of 40 kN.

Description

AREA OF INVENTION

[0001] The present disclosure relates to a system for evaluating the strength improvement of the roadbed by bamboo fiber reinforcement. BACKGROUND OF THE INVENTION

[0002] Conventional soil stabilization methods for improving road subgrades are predominantly based on chemical additives such as lime, cement, or synthetic fibers. While these methods effectively increase soil strength and load-bearing capacity, they present significant challenges, including high CO2 emissions, high material costs, environmental impact, and limited long-term stability. The increasing focus of the construction industry on sustainable and environmentally friendly practices has necessitated the development of alternative stabilization methods that minimize environmental impact while maintaining technical performance.

[0003] Reinforcement with natural fibers has established itself as a practical and environmentally friendly alternative for improving weak subgrades. Among the various natural fibers, bamboo fibers exhibit considerable potential due to their high tensile strength, durability, effective adhesion to soil particles, biodegradability, and widespread availability in tropical regions. Bamboo fiber reinforcement improves the shear strength, load-bearing capacity, ductility, and resilience of subgrades under repeated traffic loads, while simultaneously optimizing energy dissipation and deformation control in flexible pavement systems.

[0004] The northeastern region of India, particularly Tripura, has abundant bamboo deposits, totaling approximately 2,397 km². 2Bamboo forests comprise approximately 28% of India's total bamboo population. Despite this availability and the proven effectiveness of bamboo fibers in geotechnical applications, comprehensive evaluation systems that systematically investigate the engineering performance of subsoils reinforced with locally available bamboo species using integrated laboratory and field tests are lacking.

[0005] Therefore, there is a need for a comprehensive system that enables a systematic evaluation of improving the load-bearing capacity of road subgrades using locally available bamboo fibers and includes standardized test protocols for compaction properties, load-bearing capacity, strength parameters and field deformation behavior in order to determine the technical feasibility and performance efficiency of bamboo fiber reinforcement for sustainable road construction. SUMMARY OF THE INVENTION

[0006] This disclosure relates to a comprehensive system for evaluating the strength improvement of road subgrades through bamboo fiber reinforcement. The system integrates material preparation, laboratory and field tests, and deflection measurements to systematically evaluate the engineering performance of subgrades reinforced with locally available bamboo species, including Barak (Bambusa balcooa), Bari (Bambusa polymorpha), and Mritinga (Bambusa). The system enables the determination of critical parameters such as maximum dry density (MDD), optimal moisture content (OMC), California bearing ratio (CBR) in saturated and unsaturated conditions, and field deflection behavior using a falling weight deflectometer (FWD).It allows the comparison of untreated and bamboo fiber-reinforced subsoils to determine the technical feasibility and performance of bamboo fibers as a sustainable, natural reinforcement material for road construction.

[0007] The present disclosure relates to a system for evaluating the strength improvement of road subgrades by bamboo fiber reinforcement. The system comprises: a) a material preparation unit for producing a soil-bamboo fiber mixture, wherein the bamboo fibers are selected from the group consisting of Barak (Bambusa balcooa), Bari (Bambusa polymorpha), and Mritinga (Bambusa tulda), wherein the fibers have a length of 1.5 cm and a diameter of 2-3 mm and are incorporated at 3% of the dry weight of the soil; a compaction test unit for performing the standard Proctor compaction test to determine the maximum dry density (MDD) and optimal moisture content (OMC); a bearing capacity test unit for performing the California Bearing Ratio (CBR) test, the test unit being designed for both saturated and unsaturated CBR tests; a subgrade preparation unit for preparing a subgrade test section for roadways, comprising layering and compacting the soil-bamboo fiber mixture in 150 mm thick layers to achieve a subgrade thickness of approximatelyto achieve 600 mm; and a deflection measuring unit for performing a falling weight deflectometer (FWD) test, wherein the deflection measuring unit comprises seven geophone sensors arranged at intervals of 0 mm, 300 mm, 600 mm, 900 mm, 1200 mm, 1500 mm and 1800 mm from the center of a load plate, and a load cell configured to apply a load of 40 kN.

[0008] The purpose of this disclosure is to provide a system for evaluating the improvement in roadbed strength through bamboo fiber reinforcement.

[0009] Another objective of the present disclosure is to provide a system for the systematic evaluation of the strength improvement of the subgrade of roadways using locally available bamboo fibers as a natural reinforcement material, which enables a comprehensive assessment of the technical properties through integrated laboratory and field testing methods.

[0010] Another objective of the present disclosure is to determine the compaction properties, including the maximum dry density (MDD) and optimal water content (OMC), as well as the bearing capacity parameters by CBR (California Bearing Ratio) tests in the saturated and unsaturated state for subsoils reinforced with bamboo fibers.

[0011] Another objective of the present disclosure is to determine the field evaluation of the deflection behavior of roadways using falling weight deflectometer (FWD) tests with multiple geophone sensors, thereby enabling the assessment of the load distribution capacity and stiffness improvement in subgrades treated with bamboo fibers.

[0012] However, another objective of the present disclosure is to enable a comparative performance evaluation of various locally available bamboo species (Barak, Bari and Mritinga) in order to identify the most effective bamboo fiber reinforcement for sustainable applications to improve the subgrade of roadways.

[0013] To further clarify the advantages and features of the present disclosure, the invention is described in more detail with reference to specific embodiments illustrated in the accompanying drawing. It is understood that this drawing merely shows typical embodiments of the invention and is therefore not to be understood as limiting its scope of protection. The invention is described and explained in more detail and with reference to the accompanying drawing. BRIEF DESCRIPTION OF THE IMAGE

[0014] These and other features, aspects and advantages of the present disclosure will be better understood when the following detailed description is read with reference to the accompanying drawing, in which the same symbols represent the same parts, wherein: Fig. Figure 1 shows a block diagram of a system for evaluating the strength improvement of the subgrade of roadways by bamboo fiber reinforcement according to an embodiment of the present disclosure.

[0015] Furthermore, those skilled in the art will recognize that the elements in the drawing are simplified and not necessarily drawn to scale. For example, the flowcharts illustrate the process by highlighting the main steps to facilitate understanding of the present disclosure. With regard to the construction of the device, one or more components may be represented in the drawing by conventional symbols. The drawing may show only those specific details relevant to understanding the embodiments of the present disclosure, so as not to clutter the drawing with details that are already apparent to those skilled in the art from the description contained herein. DETAILED DESCRIPTION:

[0016] To facilitate understanding of the principles of the invention, reference is made below to the embodiment shown in the drawing, which is described using specific terms. It is understood, however, that this does not limit the scope of protection of the invention. Rather, modifications and further developments of the depicted system, as well as further applications of the inventive principles shown therein, are conceivable, insofar as they would normally occur to a person skilled in the art in the field of the invention.

[0017] It will be clear to those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not to be understood as a limitation of it.

[0018] References to “an aspect”, “another aspect”, or similar phrases in this description mean that a particular feature, structure, or property described in connection with the embodiment is included in at least one embodiment of the present disclosure. Therefore, phrases such as “in one embodiment”, “in another embodiment”, and similar expressions in this description may, but do not necessarily, all refer to the same embodiment.

[0019] The terms "includes," "comprehensive," or similar expressions denote non-exclusive inclusion. Thus, a procedure or method containing a list of steps does not only include those steps but may also include further steps not explicitly listed or inherent in the procedure or method. Likewise, the statement "includes..." for one or more devices, subsystems, elements, structures, or components, without further limitations, does not preclude the existence of other devices, subsystems, elements, structures, or components.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meanings generally known to those skilled in the art in the field to which this invention belongs. The systems, methods, and examples described herein serve only for illustration and are not to be understood as limiting.

[0021] Embodiments of the present disclosure are described in detail below with reference to the attached drawing.

[0022] Fig. Figure 1 shows a block diagram of a system for evaluating the strength improvement of the subgrade of roadways by bamboo fiber reinforcement according to an embodiment of the present disclosure.

[0023] According to Fig.1 The system (100) comprises: a) a material preparation unit (102) for producing a soil-bamboo fiber mixture, wherein the bamboo fibers are selected from the group consisting of Barak (Bambusa balcooa), Bari (Bambusa polymorpha), and Mritinga (Bambusa tulda), wherein the fibers have a length of 1.a) a compaction test unit (104) for performing the Standard Proctor compaction test to determine the maximum dry density (MDD) and optimal moisture content (OMC); c) a bearing capacity test unit (106) for performing the California Bearing Ratio (CBR) test, wherein the test unit can perform both saturated and unsaturated CBR tests; d) a subgrade preparation unit (108) for preparing a subgrade test section for roadways, comprising layering and compacting the soil-bamboo fiber mixture in 150 mm thick layers to achieve a subgrade thickness of approximatelyto achieve 600 mm; and e) a deflection measuring unit (110) configured to perform a falling weight deflectometer (FWD) test, the deflection measuring unit comprising seven geophone sensors arranged at intervals of 0 mm, 300 mm, 600 mm, 900 mm, 1200 mm, 1500 mm and 1800 mm from the center of a load plate, and a load cell configured to apply a load of 40 kN.

[0024] In one embodiment, the material preparation unit (102) is configured to prepare the soil by air drying and sieving through a 4.75 mm IS sieve before mixing it with bamboo fibers.

[0025] In one embodiment, the load-bearing capacity test unit (106) is configured to prepare samples for the CBR test in a saturated state by immersing the compacted samples in water four days prior to the test. The load-bearing capacity test unit (106) comprises a CBR mold with a diameter of 150 mm and a height of 175 mm and is configured to compact the soil-bamboo fiber mixture in five layers with 56 blows per layer using a 2.6 kg rammer dropped from a height of 310 mm.

[0026] In one embodiment, the subgrade preparation unit (108) is configured to prepare the test section. The subgrade preparation unit (108) comprises a vibratory plate compactor configured to compact each layer to achieve the maximum dry density (MDD) determined in laboratory compaction tests.

[0027] In one embodiment, the substrate preparation unit (108) is further configured to cure the compacted substrate surface for 48 hours under controlled conditions.

[0028] In one embodiment, the deflection measuring unit (110) comprises a data acquisition module configured to record vertical deformations at each geophone sensor location under the applied load.

[0029] In one embodiment, the system further comprises a test unit (112) for determining the uniaxial compressive strength (UCS), which is configured to evaluate the strength parameters of the soil-bamboo fiber mixture.

[0030] In one embodiment, the system is configured to evaluate the performance of the subgrade of roadways for untreated soil and soil reinforced with Barak bamboo fibers, Bari bamboo fibers and Miritinga bamboo fibers.

[0031] The present invention provides a system for evaluating the strength increase of road subgrades through bamboo fiber reinforcement. The system comprises a material preparation unit for producing a soil-bamboo fiber mixture with a fiber content of 3 wt.% (dry weight), a compaction test unit for determining the maximum dry density (MDD) and the optimal moisture content (OMC), a bearing capacity test unit for performing CBR tests in saturated and unsaturated conditions, a subgrade preparation unit for producing test sections with layer-by-layer compaction, and a deflection measurement unit with seven geophone sensors for FWD tests. The system enables the comprehensive evaluation of untreated and bamboo fiber-reinforced subgrades using the locally available bamboo species Barak, Bari, and Mritinga.It provides a systematic evaluation of performance parameters such as density, water content, load-bearing capacity and deflection behavior in the field for sustainable road construction projects.

[0032] In one embodiment, the system comprises a material preparation unit for producing a soil-bamboo fiber mixture for evaluating subgrade materials for road construction. The material preparation unit processes soil from the designated site, which is classified as silty sand according to the Indian Standard Soil Classification System. The material preparation unit is configured to incorporate three different bamboo fiber species from the group consisting of Barak (Bambusa), Bambusa (Bambusa), balcooa, Bari (Bambusa polymorpha), and Mritinga (Bambusa). The material preparation unit is configured to produce bamboo fibers with a length of 1.5 cm and a diameter of 2-3 mm. It includes a soil preparation unit that air-dries the soil and sieves it through a 4.75 mm (IS standard) screen to remove coarse particles and achieve a uniform particle size distribution.The unit also includes a fiber preparation plant that cuts the bamboo fibers to the specified dimensions, removes surface impurities, and dries the fibers in the shade to ensure a uniform consistency before mixing. The bamboo fibers are incorporated at a rate of 3% of the soil's dry weight. The mixing plant includes a manual mixer that blends the bamboo fibers with the dry soil in batches to ensure even distribution and prevent clumping or fiber ball formation. Water is then gradually added according to the optimal moisture content (OMC), and the soil-fiber-water mixture is thoroughly blended until a homogeneous mass with a uniform texture and moisture distribution is achieved.

[0033] In another embodiment, the system includes a compaction test unit for performing the standard Proctor compaction test according to ASTM D698-07 on treated and untreated subsoil samples. The compaction test unit is used to determine the maximum dry density (MDD) and optimal moisture content (OMC) of the soil-bamboo fiber mixture. It includes a test apparatus according to ASTM D698-07, which enables a systematic evaluation of the compaction properties of untreated soil and soil reinforced with Barak, Bari, and Mritinga bamboo fibers.

[0034] In another embodiment, the system includes a bearing capacity testing unit for performing California Bearing Ratio (CBR) tests according to IS: 2720 (Part XVI). The bearing capacity testing unit is designed to perform CBR tests in both saturated and unsaturated conditions to determine the bearing capacity of the soil under various field moisture conditions.

[0035] The bearing capacity testing unit includes a sample preparation facility for producing test specimens from a mixture of soil and bamboo fibers of three different, locally available species: Barak (Bambusa balcooa), Bari (Bambusa polymorpha), and Mritinga (Bambusa). The fibers (tulda) are each 1.5 cm long and 2-3 mm in diameter. The bearing capacity testing facility is configured to prepare soil samples by air drying and sieving through a 4.75 mm (IS standard) sieve. The facility includes equipment for dosing the required amount of dry soil, adding the optimal fiber content, and gradually mixing the fibers with the soil to ensure homogeneous distribution. Subsequently, water is added incrementally according to the optimal moisture content (OMC), and the entire mixture is thoroughly blended until a uniform texture is achieved.

[0036] The load-bearing capacity test fixture consists of a CBR mold with a diameter of 150 mm and a height of 175 mm, equipped with a removable base plate and a removable collar. The test fixture includes a compaction device with a standard 2.6 kg rammer that is dropped to a height of 310 mm. The prepared soil-bamboo fiber mixture is compacted in five layers, with each layer receiving 56 rammer blows. Compaction is performed according to the standard Proctor procedure described in IS: 2720 (Part VII). After compaction, the collar is removed and excess soil is trimmed flush with the mold surface.

[0037] The test facility for bearing capacity testing is configured to prepare samples for the CBR test in a saturated state by immersing compacted samples in water for four days under controlled laboratory conditions prior to testing. The facility is also configured to test unsaturated CBR samples immediately after compaction to simulate field soil moisture conditions. The facility determines CBR values ​​for untreated soil as well as for soil reinforced with Barak, Bari, and Mritinga bamboo fibers, thus enabling a comparison of bearing capacity under different moisture conditions.

[0038] In another embodiment, the system includes a subgrade preparation unit for preparing a subgrade test section for falling weight deflectometer (FWD) testing. The subgrade preparation unit prepares the test section and includes equipment for constructing test pits that replicate the real-world field conditions of a flexible road subgrade. This unit enables the evaluation of the deformation properties of bamboo fiber-reinforced soil under controlled loading conditions. It includes material processing equipment that extracts the subgrade soil from the construction site, air-dries it, and pulverizes it to remove lumps and organic matter. The processed soil is then screened through a 4.75 mm (IS standard) screen to achieve a uniform particle size distribution suitable for subgrade preparation.The subsoil preparation unit processes bamboo fibers from three locally available species: Barak (Bambusa balcooa), Bari (Bambusa polymorpha), and Mritinga (Bambusa tulda). These fibers are cut to an average length of 1.5 cm and a diameter of 2-3 mm, cleaned of surface impurities, and dried in the shade. The subsoil preparation unit is configured to incorporate bamboo fibers into the soil at a rate of 3% of the soil's dry weight. The unit includes a mixing device configured to manually mix the fibers with dry soil in successive steps to ensure even distribution and prevent clumping.The subgrade preparation unit is configured to gradually add water in an amount corresponding to the optimal moisture content (OMC) determined through laboratory compaction tests. The subgrade preparation unit is configured to thoroughly mix the soil-fiber-water mixture until a homogeneous mass with a uniform texture and moisture distribution is achieved. The subgrade preparation unit is configured to place the prepared soil-bamboo fiber mixture into a test pit representing the subgrade of a roadway section. The subgrade preparation unit is configured to place the material in 150 mm thick layers.The subgrade preparation unit consists of a vibratory plate compactor that compacts each layer to achieve the maximum dry density (MDD) determined in the laboratory. The unit ensures a uniform density across the entire section during compaction. To guarantee adhesion and continuity of the intermediate layers, each compacted layer is lightly roughened before the next is applied. The layering and compaction process is repeated until the desired subgrade thickness of approximately 600 mm is achieved. After compaction, the subgrade surface is leveled, lightly moistened, and allowed to cure for 48 hours under controlled conditions to promote moisture equalization and minimize post-compaction settlement. Finally, the prepared surface is leveled and smoothed to create a stable platform for subsequent FWD testing.

[0039] In another embodiment, the system comprises a deflection measuring unit for performing a falling weight deflectometer (FWD) test to determine the vertical deformation of a roadway section under controlled impact loading. The deflection measuring unit is positioned directly above a defined loading point on the subsurface. It consists of seven geophone sensors (S1-S7) positioned on the subsurface to detect the vertical deflection of the subsurface material under load. The geophone sensors are arranged radially at intervals of 0 mm, 300 mm, 600 mm, 900 mm, 1200 mm, 1500 mm, and 1800 mm from the center of a load plate. The deflection measuring unit includes a load cell that applies a load of 40 kN at the test point via a circular load plate.The deflection measurement unit is configured to apply a controlled impact load to the subsurface and enable the measurement of the corresponding vertical deformations at each sensor location. The unit includes data acquisition software configured to record the vertical deformations at each geophone sensor under the applied load. The unit is configured to capture and store the deformation data for later analysis. It measures the vertical deformation along the subsurface cross-section under load for various subsurface conditions: (i) untreated subsurface, (ii) subsurface reinforced with Barak bamboo fibers, (iii) subsurface reinforced with Bari bamboo fibers, and (iv) subsurface reinforced with Mritinga bamboo fibers.The measuring unit enables a comparison of the deflection response of roadways on untreated and bamboo fiber-reinforced substrates, and thus the assessment of the load distribution capacity, stiffness improvement and deformation properties of the roadway substrate.

[0040] The present invention aims to evaluate the potential of locally available bamboo fibers, Barak (Bambusa balcooa), Bari (Bambusa polymorpha), and Mritinga (Bambusa tulda), which are used as natural reinforcing material to improve the strength and deformation properties of subsoil for road pavements. The following conclusions can be drawn from the results: 1. The addition of bamboo fibers affects the compaction properties of the soil. At lower fiber contents, the maximum dry density (MDD) increases slightly, while higher fiber contents lead to a slight reduction in MDD due to the increased pore volume. The optimal moisture content (OMC), on the other hand, gradually increases with increasing fiber addition, which is due to the water absorption capacity of the fibers. 2. The California Bearing Strength Ratio (CBR) results show a significant improvement in subsoil strength due to fiber reinforcement. The untreated soil exhibited CBR values ​​of 4.75% in the saturated state and 8.62% in the unsaturated state, while fiber-reinforced soils showed a significant improvement. Among the treated samples, the use of Mritinga bamboo fibers achieved the greatest improvement: CBR values ​​increased by approximately 166% in the saturated state and by approximately 133% in the unsaturated state compared to the untreated soil. 3. The uniaxial compressive strength (UCS) of the treated samples also improved significantly, by 35% for Barak, 32% for Bari, and 37% for Mritinga bamboo fibers. This improvement is attributed to the enhanced interfacial adhesion between fibers and soil particles, which contributes to higher shear strength and energy dissipation. 4. The results of the falling weight deflectometer (FWD) test confirmed that the fiber reinforcement effectively reduced surface deformations and increased the stiffness of the road substructure. The substructure reinforced with Mritinga bamboo fibers exhibited the highest deformation reduction of up to 74–75%, followed by Barak and Bari bamboo fibers. This indicates superior load distribution and lower deformation under dynamic loading. 5. Overall, the following ranking emerged for the performance of the substrates reinforced with bamboo fibers: Mritinga > Barak > Bari > Untreated soil.

[0041] The results demonstrate that locally available bamboo fibers can serve as sustainable, cost-effective, and environmentally friendly reinforcement materials for soil stabilization in the subsoil of road construction projects. The use of bamboo fibers not only improves mechanical properties but also promotes sustainable infrastructure development in regions with abundant bamboo resources, such as Tripura. Future research could focus on the long-term durability of fiber-reinforced subsoils under cyclic and environmental loading to optimize their practical application.

[0042] The drawing and the preceding description illustrate embodiments. Those skilled in the art will recognize that one or more of the described elements can be combined to form a single functional element. Alternatively, certain elements can be divided into several functional elements. Elements of one embodiment can be added to another. For example, the process flows described here can be modified and are not limited to the manner described herein. Furthermore, the actions of a flowchart need not be performed in the sequence shown; nor do all actions necessarily need to be carried out. Actions that do not depend on other actions can be performed in parallel with the other actions. The scope of protection of the embodiments is in no way limited by these specific examples. Numerous variations, whether explicitly stated in the description or not, such as...Differences in structure, dimensions, and materials are possible. The scope of protection of the embodiments is at least as comprehensive as described by the following claims.

[0043] The advantages, other benefits, and problem solutions have been described above with reference to specific embodiments. However, the advantages, benefits, problem solutions, and any components that can effect or enhance an advantage, benefit, or solution are not to be construed as critical, necessary, or essential features or components of the claims. REFERENCES 100 A system for evaluating the improvement of the strength of the road substructure through reinforcement with bamboo fibers. 102 Material preparation unit 104 Compaction tester 106 Testing device for load-bearing capacity 108 Preparation Unit for the Underground Section 110 Deflection measuring unit 112 Uniaxial Compressive Strength Testing Device (UCS)

Claims

[1] A system for evaluating the strength improvement of the roadbed by bamboo fiber reinforcement, consisting of: a) a material processing unit for producing a soil-bamboo fiber mixture, wherein the bamboo fibers are selected from the group consisting of Barak (Bambusa balcooa), Bari (Bambusa polymorpha), and Mritinga (Bambusa tulda), wherein the fibers have a length of 1.5 cm and a diameter of 2-3 mm and are incorporated at a rate of 3% of the dry weight of the soil; b) a compaction test facility configured to perform the Standard Proctor compaction test to determine the maximum dry density (MDD) and optimal moisture content (OMC); c) a load-bearing capacity test unit configured to perform CBR (California Bearing Ratio) tests, wherein the test unit is designed for CBR tests in both the impregnated and unimpregnated states; d) a subgrade preparation unit configured to prepare a subgrade test section for roadways, comprising layering and compacting the soil-bamboo fiber mixture in 150 mm thick layers to achieve a subgrade thickness of approximately 600 mm; and e) a deflection measuring unit for performing a falling weight deflectometer (FWD) test, wherein the deflection measuring unit comprises seven geophone sensors arranged at intervals of 0 mm, 300 mm, 600 mm, 900 mm, 1200 mm, 1500 mm and 1800 mm from the center of a load plate, and a load cell configured to apply a load of 40 kN. [2] System according to claim 1, wherein the material preparation unit is configured such that the soil is prepared by air drying and sieving through a 4.75 mm IS sieve prior to mixing with bamboo fibers. [3] System according to claim 1, wherein the load-bearing capacity test unit is configured to prepare samples for the CBR test in the saturated state by immersing the compacted samples in water four days prior to testing, wherein the load-bearing capacity test unit comprises a CBR mold with a diameter of 150 mm and a height of 175 mm and is configured to compact the soil-bamboo fiber mixture in five layers with 56 blows per layer using a 2.6 kg tamper dropped from a height of 310 mm. [4] System according to claim 1, wherein the subsoil section preparation unit is configured to prepare the test section, the subsoil section preparation unit comprising a vibratory plate compactor configured to compact each layer to achieve the maximum dry density (MDD) determined from laboratory compaction tests. [5] System according to claim 1, wherein the substrate preparation unit is further configured to cure the compacted substrate surface for 48 hours under controlled conditions. [6] System according to claim 1, wherein the deflection measuring unit comprises a data acquisition module configured to record vertical deformations at each geophone sensor position under the applied load. [7] System according to claim 1, further comprising a test unit for determining the uniaxial compressive strength (UCS) configured to evaluate the strength parameters of the soil-bamboo fiber mixture. [8] System according to claim 1, wherein the system is configured to evaluate the performance of the subgrade of roadways for untreated soil and soil reinforced with Barak bamboo fibers, Bari bamboo fibers and Miritinga bamboo fibers.

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