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Construction Material Testing
GSB and WMM Mix Design
GSB and WMM mix design to MoRTH Clauses 401 and 404 — gradation, CBR, abrasion and plasticity of fines for granular sub-base and base layers
NABL TC-14144
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ISO/IEC 17025:2017
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NHAI / PWD / BRO Approved
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24-72h Mobilisation
MoRTH 5th Revision — Cl. 401
MoRTH 5th Revision — Cl. 404
IRC SP 89:2018
What are GSB and WMM in road construction?
GSB = Granular Sub-Base and WMM = Wet Mix Macadam — unbound granular pavement layers laid above the subgrade. Their gradation, density and CBR requirements follow MoRTH Section 401 (GSB) and Section 406 (WMM). NKMPV designs and tests GSB and WMM mixes in a NABL-accredited laboratory.
GSB (Granular Sub-Base) and WMM (Wet Mix Macadam) mix design is the laboratory process of proportioning and verifying aggregate blends to meet MoRTH grading and strength requirements for pavement sub-base and base layers. A properly designed GSB/WMM mix ensures structural adequacy, effective drainage, and long-term pavement performance.
What Is GSB and WMM Mix Design?
GSB and WMM mix design determines the optimal blend of coarse aggregates, fine aggregates, and filler materials that satisfies the gradation envelopes specified in MoRTH Section 400. For GSB layers (Clause 401), aggregates are blended to meet one of the six grading requirements in Table 400.1, with a minimum soaked CBR of 30% for the blended material. For WMM layers (Clause 404), the aggregate blend must conform to the grading in Table 400.4, with stricter requirements for aggregate quality including Los Angeles Abrasion value, Flakiness Index, and Plasticity Index of the fines.
The mix design process involves sieve analysis of individual aggregate fractions from the crusher, mathematical blending to achieve the target grading envelope, and verification through CBR testing and aggregate quality tests. Modified Proctor compaction testing establishes the OMC and MDD for field compaction control.
NKMPV performs complete GSB and WMM mix design services for highway contractors, NHAI project consultants, and state PWD agencies. Our mix designs are backed by test results from our NABL-accredited laboratory and include detailed gradation charts, blending proportions, and compaction parameters ready for site implementation. We also provide guidance on bituminous mix design for the overlying pavement layers.
Test Parameters & Acceptance Criteria
The following parameters are evaluated during GSB and WMM mix design. Acceptance criteria are drawn from MoRTH 5th Revision Section 400 and IRC SP 89. All individual aggregate tests are performed per the relevant IS standards.
| Parameter | Value / Range | Unit | Standard |
|---|---|---|---|
| GSB Grading (Table 400.1) | Grading I to VI (close-graded and coarse-graded) | % passing | MoRTH Cl. 401.2.2 |
| WMM Grading (Table 400.4) | Single grading envelope (53 mm nominal max size) | % passing | MoRTH Cl. 404.2.3 |
| CBR of Blended GSB Material (Soaked) | ≥ 30% | % | MoRTH Cl. 401.2.1 |
| Los Angeles Abrasion Value | ≤ 40% (GSB), ≤ 40% (WMM) | % | MoRTH Cl. 401.2.1 / Cl. 404.2.2 |
| Plasticity Index of Fines | ≤ 6 (GSB), Non-plastic (WMM) | MoRTH Cl. 401.2.1 / Cl. 404.2.2 | |
| Liquid Limit of Fines | ≤ 25% | % | MoRTH Cl. 401.2.1 |
| Flakiness & Elongation Index (WMM) | ≤ 35% (combined) | % | MoRTH Cl. 404.2.2 |
| Maximum Dry Density (MDD) | Determined from Modified Proctor | g/cc | IS 2720 Part 8 |
| Field Compaction Requirement | ≥ 98% of lab MDD | % | MoRTH Cl. 401.5 / Cl. 404.3.4 |
Applicable Indian Standards
MoRTH 5th Revision — Cl. 401
Specifications for Road and Bridge Works — Section 400: Granular Sub-Base
MoRTH 5th Revision — Cl. 404
Specifications for Road and Bridge Works — Section 400: Wet Mix Macadam
IRC SP 89:2018
Guidelines for Soil and Granular Material Stabilisation Using Cement, Lime & Fly Ash
IS 2720 Part 8
Methods of Test for Soils — Determination of Water Content-Dry Density Relation Using Heavy Compaction
IS 2386 Parts 1-8
Methods of Test for Aggregates for Concrete (Sieve Analysis, Abrasion, Impact, Shape)
IS 2720 Part 16
Methods of Test for Soils — Laboratory Determination of CBR
IS 2720 Part 5
Methods of Test for Soils — Determination of Liquid and Plastic Limit
Equipment Used
IS Sieve Set (Aggregate Grading)
AIMIL brass frame sieves (75 mm to 75 micron)
Full set: 75, 53, 45, 26.5, 19, 9.5, 4.75, 2.36, 0.425, 0.075 mm per MoRTH Table 400.1 / 400.4
CalibratedMechanical Sieve Shaker
AIMIL AIM-481
300 mm diameter sieves, motorised with timer for 10-minute cycles
CalibratedLos Angeles Abrasion Testing Machine
AIMIL AIM-085
500 mm diameter drum, 30-33 RPM, with standard charge of steel balls per IS 2386 Part 4
CalibratedCBR Testing Machine
AIMIL AIM-304-1
50 kN capacity with motorised loading frame and proving ring
CalibratedHeavy Compaction Apparatus (Modified Proctor)
4.89 kg rammer, 450 mm drop height, 150 mm mould
5-layer compaction at 56 blows per layer per IS 2720 Part 8
CalibratedAtterberg Limits Apparatus
Casagrande liquid limit device with grooving tool
For determining Liquid Limit, Plastic Limit, and Plasticity Index per IS 2720 Part 5
CalibratedFlakiness & Elongation Index Gauges
Standard IS gauges (thickness and length)
For aggregate fractions 6.3 mm to 63 mm per IS 2386 Part 1
CalibratedTesting Process
1
Aggregate Sample Collection
Day 1Representative samples of each aggregate fraction are collected from the crusher or stockpile at the project hot mix plant or quarry site. Typically 3-4 fractions are sampled: coarse aggregate (53-26.5 mm, 26.5-9.5 mm), fine aggregate (crusher dust or natural sand), and filler (stone dust passing 0.075 mm). Each fraction requires approximately 50-60 kg for the full test program. Samples are bagged, labelled with source and fraction size, and transported to the laboratory.
2
Individual Fraction Sieve Analysis
Day 1-3Each aggregate fraction is dried to constant weight and subjected to sieve analysis using the full IS sieve set per IS 2386 Part 1. The gradation curve of each fraction is plotted. Simultaneously, aggregate quality tests are initiated — Los Angeles Abrasion value (IS 2386 Part 4), Aggregate Impact Value, Flakiness and Elongation Index (IS 2386 Part 1), Water Absorption, and Specific Gravity. For fines, Liquid Limit and Plastic Limit are determined per IS 2720 Part 5.
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Mathematical Blending & Gradation Optimisation
Day 3-4Using the individual gradation data, a trial-and-error or analytical blending approach is used to determine the proportions of each fraction that produce a combined gradation falling within the target MoRTH envelope. For GSB, the blend is checked against Table 400.1 (Grading I through VI as specified by the project). For WMM, the blend must satisfy the single grading envelope of Table 400.4. Multiple trial blends are evaluated until the optimum proportions are established.
4
Compaction Testing (MDD & OMC)
Day 4-5The blended aggregate at the designed proportions is subjected to Modified Proctor compaction testing per IS 2720 Part 8. The material is compacted in a 150 mm mould in 5 layers with 56 blows per layer at varying moisture contents. The Maximum Dry Density (MDD) and Optimum Moisture Content (OMC) are determined from the compaction curve. These values establish the field compaction target — MoRTH requires a minimum 98% of laboratory MDD.
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CBR Testing of Blended Material (GSB)
Day 5-9 (includes 4-day soaking)For GSB mix design, the blended material at OMC is compacted in CBR moulds and subjected to 4-day soaking per IS 2720 Part 16. After soaking, penetration testing is performed to determine the soaked CBR value. MoRTH Clause 401 requires the blended GSB material to have a minimum soaked CBR of 30%. If the CBR falls short, the blend proportions are adjusted and retested.
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Mix Design Report Preparation
Day 9-10The final mix design report includes: individual and combined gradation charts showing the blend within the MoRTH envelope, blending proportions by weight, aggregate quality test results (LA Abrasion, Flakiness, Plasticity Index, Water Absorption), compaction parameters (MDD and OMC), CBR results (for GSB), and field mixing instructions. The report is issued as a signed document with recommendations for crusher settings and stockpile management.
Where This Test Is Used
GSB and WMM mix design is mandatory for all national highway, state highway, and expressway projects governed by MoRTH specifications. The Granular Sub-Base layer provides load distribution and drainage beneath the base course, while the WMM layer serves as the primary base course in flexible pavements designed per IRC 37. Every NHAI and state PWD road project requires an approved mix design before commencing layer construction. NKMPV provides mix design services alongside aggregate quality testing and CBR testing to deliver a complete material approval package. Our mix designs feed directly into bituminous mix design workflows for the overlying asphalt layers.
National highway and expressway GSB/WMM layer construction per MoRTH Section 400
State highway and district road pavement base course design
Airport runway and taxiway granular base layers per DGCA specifications
Industrial park and SEZ internal road construction
Material source approval and crusher production optimisation
Quality control during ongoing road construction — periodic compliance verification
Pavement rehabilitation and widening projects requiring new granular layers
Rural road (PMGSY) sub-base and base course design
Detailed Information
GSB and WMM Mix Design
GSB and WMM Mix Design and quality of road construction materials, particularly Granular Sub Base (GSB) and Wet Mix Macadam (WMM), are vital for the longevity, stability, and performance of road pavements. GSB and WMM are both considered crucial components in the construction of pavements as they provide the necessary load-bearing capacity and help in distributing traffic loads effectively. They also provide drainage, improve stability, and reduce the risk of deformation under repeated traffic stress. The success of road construction hinges on ensuring that the materials used in these layers are of the right quality, properly mixed, and tested to meet specific standards. The quality of these materials depends significantly on the correct composition or design mix. A well-designed mix optimizes the material properties such as strength, compaction, and durability. This report delves into the essential tests and parameters involved in designing and testing the mix for GSB and WMM, including sieve size analysis, impact value, Atterberg limits, California Bearing Ratio (CBR), water absorption, and other crucial factors. These tests are based on Indian Standard (IS) codes and Ministry of Road Transport and Highways (MORTH) specifications, which serve as the framework for ensuring that materials meet the desired quality standards for road construction.Section 1: Granular Sub Base (GSB)
1.1 Sieve Size Analysis/Grading of GSB Materials
Description: Grading refers to the distribution of different particle sizes in the GSB material. Grading is a critical factor because it determines the compaction and load distribution properties of the material. Proper grading helps in achieving better inter-particle bonding and prevents excessive voids that could reduce the stability of the base layer. A well-graded aggregate mix ensures that the material is compacted to its maximum density, resulting in a stable and strong base layer. Purpose of Testing:- Ensure Gradation:The main objective of grading is to obtain a uniform particle size distribution that enhances the compaction of the material and provides better load transfer. A good gradation leads to a compact structure with fewer voids, which is essential for load distribution.
- Verify Compliance:The grading of the material should meet MORTH Section 400 specifications, ensuring that the aggregate composition is appropriate for road base construction.
- Conduct sieve analysis as per IS 2720 Part 4:1985.
- Use standard sieves and record the percentage of material passing through each sieve.
- Compare the results with MORTH grading limits, which are designed to optimize compaction and performance.
1.2 Wet Impact Value of GSB Materials
Description: The wet impact value measures the toughness of the GSB aggregates when subjected to loading under wet conditions. This test is essential as it simulates the effect of moisture on the material's strength and durability, particularly under traffic loadings in wet conditions. Purpose of Testing:- Assess Durability:This test helps determine whether the aggregates are durable enough to withstand traffic-induced stresses when saturated with water. Wet conditions can weaken aggregates, and the test ensures the material will not disintegrate under such conditions.
- Check Resilience:It ensures that the GSB material retains its strength and stability when exposed to moisture, thereby ensuring the road structure's durability under varying weather conditions.
- Conduct the test as per IS 2386 Part 4:1963.
- Soak aggregates to a saturated state and place them in the impact testing machine.
- Record the percentage of fines generated during the test, which indicates the toughness of the material.
1.3 Liquid Limit and Plastic Limit (Atterberg Limits) of GSB
Description: Atterberg limits are critical for determining the plasticity of fine aggregates. The liquid limit and plastic limit are used to define the moisture content boundaries between different soil states. These limits play a vital role in understanding how the material will behave under various conditions, especially when subjected to changes in moisture content. Purpose of Testing:- Evaluate Consistency:The liquid limit and plastic limit tests help determine whether the GSB material will become excessively plastic or soft when wet, which can negatively affect its stability and workability.
- Ensure Workability:The Atterberg limits ensure that the material will be workable during construction and will not become too soft or sticky, which can make compaction difficult.
- Conduct the tests as per IS 2720 Part 5:1985using Casagrande’s apparatus.
- Determine the liquid and plastic limits by measuring the moisture content at the boundary between liquid and plastic states, and calculate the plasticity index to assess the workability.
1.4 California Bearing Ratio (CBR) of GSB Materials
Description: The CBR test measures the material’s ability to withstand penetration under a standard load. The CBR value is an important indicator of the strength and suitability of subgrade and base materials in road construction. It provides an estimate of the material’s performance under traffic loads and its resistance to deformation. Purpose of Testing:- Assess Strength:CBR helps determine if the material has the required strength to support the upper layers of the pavement. A higher CBR value indicates better performance and higher load-bearing capacity.
- Ensure Compliance:The test ensures that the GSB material meets MORTH specifications for subgrade and base material strength.
- Conduct tests as per IS 2720 Part 16:1987.
- Perform both soaked and unsoaked CBR tests, and calculate the CBR value from the load-penetration curves.
1.5 Water Content-Dry Density Relation of GSB Materials (Heavy Compaction)
Description: This test establishes the relationship between the moisture content of GSB material and its dry density under heavy compaction. It is crucial for determining the optimal moisture content that results in the highest dry density. Purpose of Testing:- Optimize Compaction:The main goal is to achieve maximum dry density by adjusting the water content. Proper compaction increases the material’s stability and load-bearing capacity.
- Ensure Stability:This ensures that the material has minimal voids and provides a solid foundation for the pavement.
- Conduct tests as per IS 2720 Part 8:1983.
- Plot the water content versus dry density curve and find the optimum moisture content.
1.6 Water Absorption of GSB Materials
Description: Water absorption indicates the porosity of the GSB material. Aggregates with higher water absorption tend to be more porous, which can affect their durability and load-bearing capacity. Purpose of Testing:- Assess Durability:High water absorption indicates a more porous material, which may weaken the aggregate and make it more susceptible to weathering.
- Ensure Quality:The test ensures that the aggregates used in the GSB mix are durable and meet MORTH specifications.
- Perform tests as per IS 2386 Part 3:1963.
- Calculate the water absorption percentage based on the dry weight of the aggregates.
1.7 Water Content of GSB Materials
Description: The water content of GSB material refers to the moisture present in the material, which affects its compaction and strength. Purpose of Testing:- Ensure Proper Compaction:To ensure the right moisture content for proper compaction during construction.
- Monitor Material Quality:Ensures the material does not have excess moisture that could reduce its strength or make it difficult to handle during construction.
- Use oven drying as per IS 2720 Part 2:1973.
- Record the difference in weight before and after drying to calculate the water content.
1.8 Job Mix Formula (JMF) for GSB Materials
Description: The Job Mix Formula (JMF) specifies the proportions of aggregates to achieve the desired grading and performance characteristics. It is the result of trial mixes performed under controlled conditions. Purpose of Testing:- Optimize Composition:The JMF ensures that the right blend of coarse and fine aggregates meets the required grading limits for optimal performance.
- Ensure Consistency:By standardizing the mix, the JMF ensures uniform quality and performance across different batches of material.
- Combine materials according to MORTH Table 400-1.
- Perform trial mixes and adjust proportions to meet the grading and performance limits.
Section 2: Wet Mix Macadam (WMM)
2.1 Grading of WMM Materials
Description: Grading for WMM materials refers to the particle size distribution, which impacts compaction and load transfer. Proper grading is necessary for effective interlocking of particles, which enhances compaction and stability. Purpose of Testing:- Ensure Gradation:Grading ensures that the material achieves optimal density and strength after compaction.
- Verify Compliance:Ensures that WMM material meets MORTH Section 406 specifications for road construction.
- Perform sieve analysis as per IS 2720 Part 4:1985.
Conclusion
GSB and WMM Mix Design materials is a critical aspect of road construction that directly impacts the strength, durability, and longevity of the pavement structure. By employing a systematic and scientific approach to material selection, mix design, and rigorous testing, we can ensure that the road structure is robust and capable of withstanding the various stresses imposed by traffic loads and environmental conditions. Each test conducted for GSB and WMM serves a specific purpose, from ensuring proper grading and compaction to assessing the impact of moisture, toughness, and plasticity. The various procedures, based on Indian Standard (IS) codes and Ministry of Road Transport and Highways (MORTH) specifications, provide a standardized method to evaluate and control the quality of materials used in road construction. Adhering to these specifications guarantees that the materials meet the required standards and perform optimally under real-world conditions. The significance of the Job Mix Formula (JMF) for both GSB and WMM cannot be overstated. The JMF is essential in determining the ideal combination of materials to achieve the desired performance criteria, such as proper compaction, high strength, minimal voids, and resistance to weathering. Through trial mixes and the careful calibration of proportions, the JMF ensures consistency and uniformity in material quality, which is crucial for maintaining the overall integrity of the road structure. Moreover, tests such as the California Bearing Ratio (CBR), impact value, and water absorption not only reflect the load-bearing capacity and resilience of the materials but also shed light on the material's long-term performance. By understanding how the material behaves under different moisture conditions and loading scenarios, engineers can make informed decisions regarding the design and construction of the road. It is also important to recognize the role of compaction in ensuring that the GSB and WMM layers achieve maximum density. Proper compaction minimizes voids, enhances strength, and improves the road's ability to resist deformation. By achieving the correct balance of water content, aggregate size, and compaction efforts, the road foundation can be optimized for long-term performance. The overall goal of the design mix process is to achieve a stable, resilient, and cost-effective road foundation. The proper combination of materials, informed by detailed tests, ensures that the GSB and WMM layers are not only suitable for bearing traffic loads but also capable of withstanding the effects of moisture, temperature changes, and other environmental factors. This results in a road that performs reliably over an extended period, reducing the need for frequent maintenance and repairs. In conclusion, the process of designing the mix for GSB and WMM is indispensable for the success of road construction projects. Through meticulous testing, adherence to standards, and optimization of material properties, we can achieve roads that are durable, safe, and able to withstand the challenges posed by modern traffic demands. By prioritizing quality in the design mix, road construction engineers play a vital role in contributing to the infrastructure that supports economic development, safety, and the well-being of communities. Therefore, the thorough evaluation and testing of GSB and WMM materials are not just a regulatory requirement but an investment in the long-term performance of the nation's road network. Incorporating innovative technologies and continuously improving mix designs, while adhering to evolving standards, will further enhance the sustainability and performance of future road projects. The focus on quality materials, proper testing, and a scientifically driven design mix will continue to serve as the cornerstone of road construction, leading to roads that are not only efficient and durable but also sustainable in the face of changing environmental and traffic conditions. References:- IS 2720 Part 2:1973
- IS 2720 Part 4:1985
- IS 2720 Part 5:1985
- IS 2720 Part 8:1983
- IS 2386 Part 1:1963
- IS 2386 Part 3:1963
- IS 2386 Part 4:1963
- IS 2386 Part 5:1963
- MORTH Specifications, Section 400, 406
Photos & Lab Images
Why Choose NKMPV for GSB and WMM Mix Design?
Reports from a NABL-Accredited Lab
Our GSB and WMM mix design reports carry NABL accreditation (ISO/IEC 17025:2017), accepted by NHAI, state PWDs, and independent design consultants as the basis for layer construction approval.
Complete Aggregate Characterisation
Every mix design includes the full suite of aggregate quality tests — sieve analysis, LA Abrasion, Impact Value, Flakiness Index, Water Absorption, Specific Gravity, and Atterberg Limits — all performed in-house at our Pinjore laboratory.
Practical Blending Solutions
We design mixes that are achievable with your actual crusher output and locally available materials. Our engineers optimise blending proportions considering your stockpile fractions, minimising wastage and ensuring site-implementable designs.
Integrated CBR and Compaction Testing
CBR testing of the blended GSB material and Modified Proctor compaction parameters are included as part of the mix design package — no need for separate engagements or labs.
Quick Redesign Support
If material source changes during construction, we provide rapid re-evaluation and revised mix design within 5 working days, ensuring minimum disruption to your project schedule.
Frequently Asked Questions
GSB (Granular Sub-Base) is the lower granular layer placed directly on the prepared subgrade, primarily providing drainage and load distribution. WMM (Wet Mix Macadam) is the upper base course layer placed on GSB, designed to carry traffic loads and transfer them to the sub-base. WMM requires stricter aggregate quality — non-plastic fines, lower LA Abrasion value, and a tighter grading envelope compared to GSB. Both layers are specified under MoRTH Section 400.
MoRTH Clause 401.2.1 specifies that the blended GSB material must have a minimum soaked CBR of 30% when tested at the Modified Proctor maximum dry density. This is tested on the final blended material, not on individual aggregate fractions. If the CBR falls below 30%, the blend proportions must be adjusted or a better quality aggregate source must be used.
GSB grading is governed by MoRTH Table 400.1, which provides six grading envelopes (Grading I to VI) ranging from close-graded to coarse-graded. The project specification determines which grading to use. WMM grading is governed by MoRTH Table 400.4, which specifies a single grading envelope with 53 mm nominal maximum aggregate size. Both tables define the percentage passing at each standard sieve size.
Natural gravel can be used for GSB provided it meets the grading, CBR, and plasticity requirements of MoRTH Clause 401. However, for WMM, MoRTH Clause 404 mandates crushed aggregate with the coarse aggregate fraction having at least 90% crushed faces. Natural rounded gravel alone is generally not acceptable for WMM layers. Blending natural gravel with crushed material is permitted for GSB if the resulting blend meets all specifications.
For a complete GSB or WMM mix design, approximately 50-60 kg of each aggregate fraction is required (typically 3-4 fractions). This covers sieve analysis, LA Abrasion testing, Impact Value, Flakiness Index, specific gravity, compaction testing, and CBR testing of the blended material. Collect samples from the actual crusher or stockpile being used for the project to ensure the mix design is representative of production material.
MoRTH Clause 404.2.2 requires that the fines fraction (material passing 0.425 mm sieve) in WMM shall be non-plastic — meaning the Plasticity Index must be zero. For GSB, a Plasticity Index up to 6 is permitted per Clause 401.2.1. This distinction is critical because plastic fines in WMM can lead to pumping and rutting under traffic loading, compromising pavement performance.
GSB (Granular Sub-Base) per MoRTH Section 401 is the lower granular layer of flexible pavement — a well-graded mix of natural or crushed aggregate (25-37.5 mm max size), placed directly on the sub-grade. Provides drainage, working platform, and load distribution. CBR ≥30%, max liquid limit 25, max PI 6. Typical layer thickness 200-300 mm. WMM (Wet Mix Macadam) per MoRTH Section 406 is the upper granular layer — a more rigorously graded mix of crushed aggregate only (40 mm max size, no natural sand), mixed with optimum water and placed in 75-100 mm compacted layers. CBR ≥80%, aggregate impact value ≤30. Higher strength, lower voids than GSB. Together they form the granular base for flexible pavement under IRC 37.
GSB gradation (MoRTH 401.2.1.1, Grading-II envelope): 100% passing 53 mm, 65-95% through 26.5 mm, 50-80% through 9.5 mm, 25-55% through 2.36 mm, 5-30% through 425 μm, 1-10% through 75 μm. WMM gradation (MoRTH 406.2.1.1): 100% passing 53 mm, 95-100% through 45 mm, 65-90% through 22.4 mm, 30-50% through 4.75 mm, 10-20% through 600 μm, <5% through 75 μm. Both envelopes are precisely specified to balance compactability with strength and drainage. Trial proportioning determines the blend of available aggregate fractions to meet the envelope — this is the core of GSB/WMM mix design.
GSB/WMM mix design per MoRTH 401/406: (1) Aggregate source acceptance — IS 2386 tests (impact value, water absorption, los angeles abrasion, flakiness index) on each aggregate fraction (typically 40-20, 20-10, 10-down, dust). (2) Gradation envelope check — sieve analysis at agreed proportions; iterate proportions until the combined gradation falls within MoRTH envelope. (3) Plasticity check on fines — for GSB, ensure passing 425 μm fraction LL ≤25, PI ≤6. (4) Modified Proctor per IS 2720 Part 8 — determine OMC and MDD. (5) Soaked CBR per IS 2720 Part 16 — verify ≥30% (GSB) or ≥80% (WMM). (6) Field control parameters — mixing water tolerance, compaction roller pass count. Deliverable in 7-10 working days.
Coverage
GSB and WMM Mix Design Across India
Wherever your project is, there are two ways to work with NKMPV on GSB and WMM Mix Design.
Standard
MoRTH 5th Revision — Cl. 401
Field work
On site, across India
Laboratory
Pinjore, Haryana
Service area
Pan-India
Or courier samples to our lab
Distance is not a constraint for laboratory testing. Send samples to our Pinjore laboratory and receive the digital report on completion — the route most of our out-of-region clients use.
Where NKMPV has delivered projects
- Chandigarh
- Panchkula
- Mohali
- Ambala
- Karnal
- Kurukshetra
- Yamunanagar
- Hisar
- Gurugram
- Faridabad
- Ludhiana
- Jalandhar
- Patiala
- Shimla
- Solan
- Haryana
- Punjab
- Himachal Pradesh
These are locations where we have completed projects — not the boundary of our service area. We mobilise across India on request. See full coverage & project locations →
Which standards does NKMPV follow for GSB and WMM Mix Design?
GSB and WMM Mix Design is carried out to MoRTH 5th Revision — Cl. 401, MoRTH 5th Revision — Cl. 404, IRC SP 89:2018 and IS 2720 Part 8, as listed in the Applicable Standards section of this page. Tell us the specification your project must comply with and the quotation will state the standard the work follows.
Is there a GSB and WMM Mix Design lab near me?
Our laboratory is at Pinjore, Haryana, within same-day reach of Chandigarh, Panchkula, Mohali, Ambala and the wider Tri-City. If you are further away, distance is not a constraint: our field team travels to site anywhere in India for on-site work, and for laboratory tests you can courier samples to the Pinjore lab and receive the report digitally. Clients across Punjab, Haryana, Himachal Pradesh, Delhi-NCR, Uttarakhand, Rajasthan, Uttar Pradesh, Jammu and Kashmir and Ladakh already work with us this way.
Do you carry out GSB and WMM Mix Design outside your home region?
Yes. NKMPV operates pan-India. We have delivered projects across Chandigarh, Panchkula, Mohali, Ambala, Karnal, Kurukshetra, Yamunanagar, Hisar and beyond, and we mobilise to greenfield and remote corridors on request. The 18 locations listed on our site are the places we have already worked — not the limit of where we go.
How do I book GSB and WMM Mix Design and what does it cost?
Send us the project details — location, quantity, and the standard you need to comply with — and you get a written quotation, usually within one working day. Pricing depends on sample count, site access and mobilisation distance, so we quote per project rather than publishing a fixed rate. Call +91-82953-60108 or use the quote form; every quotation states the applicable IS/IRC standard.
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