GSB Design Mix Testing Lab | Jancy Labs
NABL Accredited Laboratory (Certificate No. TC-12176) as per ISO/IEC 17025:2017
A rejected sub-base can halt your entire road project — and delay every layer above it. Jancy Labs Pvt Ltd operates as a premier material testing facility under ISO 17025:2017 management standards, providing rapid, accurate GSB Design Mix Testing for highway and layout projects across South Tamil Nadu.
Jancy Labs Pvt Ltd operates as a premier material testing facility under ISO 17025:2017 management standards. If you need a precise GSB Design Mix Testing Lab, our Madurai facility provides rapid, accurate results for highway and layout projects.
Avoid project delays caused by rejected sub-base materials. Speak with our team →
What Is GSB Design Mix Testing?
GSB (Granular Sub Base) testing determines the ideal proportion of aggregates and soil to ensure maximum pavement stability.
Consequently, skipping this design mix leads to road settlement and costly structural failures.
Therefore, engineers use these results to meet strict MoRTH and IS Standard requirements for load-bearing layers.
| Grading | Typical Use | Character |
|---|---|---|
| Grading I | Sub-base for flexible pavements | Coarse, close-graded — maximum stability |
| Grading II | Sub-base, moderate-traffic roads | Medium coarse close-graded |
| Grading III | Drainage / filter layer | Coarse-graded, higher permeability |
| Grading IV | Sub-base, lower-traffic layouts | Finer close-graded envelope |
GSB grading envelopes as defined in MoRTH Specifications for Road and Bridge Works, Table 400-1. Your design mix confirms which grading the material satisfies.
Full Test List
A complete GSB design mix at Jancy Labs bundles every test your sub-base approval requires:
GSB Design Mix (Grading)
Confirms the combined aggregate gradation falls within the specified MoRTH grading envelope for your layer.
Heavy Proctor Compaction (MDD/OMC)
Determines Maximum Dry Density and Optimum Moisture Content for field compaction control, as per IS 2720 Part 8.
California Bearing Ratio (CBR)
Establishes the load-bearing strength of the sub-base material — the key value driving pavement thickness design.
Atterberg Limits (LL/PI)
Verifies the fines fraction meets plasticity limits, ensuring the sub-base stays stable under moisture change.
Water Absorption
Measures aggregate water absorption to confirm durability and predict field moisture behaviour.
Applicable Standards
MoRTH Specifications (Table 400-1)
The Ministry of Road Transport & Highways Specifications for Road and Bridge Works define the GSB grading envelopes, gradation limits, and material quality requirements. Consequently, your design mix must confirm compliance with the applicable MoRTH grading for the layer.
IS 2720 Supporting Tests
The supporting tests follow their respective standards — IS 2720 Part 8 (Heavy Compaction), IS 2720 Part 16 (CBR), and IS 2720 Part 5 (Atterberg Limits). Furthermore, we maintain strict adherence to ISO 17025:2017 protocols for all equipment calibration and testing procedures.
Why Choose Jancy Labs for GSB Design Mix Testing?
Our engineers deliver GSB designs that maximize local material efficiency while meeting MoRTH specifications. Specifically, we focus on achieving the highest CBR values to reduce your overall pavement thickness cost.
- GSB designs that maximize local material efficiency while meeting MoRTH specifications — reducing your dependence on expensive imported aggregate.
- Focus on achieving the highest CBR values to reduce your overall pavement thickness cost — a directly measurable saving on large road contracts.
- Reports carry the signature of experienced Civil Quality Control Engineers — not unsigned technician notes.
- Strict adherence to ISO 17025:2017 protocols for all equipment calibration and testing procedures.
- Departments like NHAI, PWD, and PMGSY consistently accept our technical data for road construction.
- Trusted by contractors and consultants working on major infrastructure across South Tamil Nadu.
Learn more about our lab standards → · Contact our engineers →
Who We Serve
We support contractors and consultants working with major infrastructure bodies including:
- RURAL: NABARD, DRDA, and Panchayat Raj Engineering.
- LAYOUTS: Developers seeking DTCP or CMDA approvals for internal road stability.
⚠️ Notably, using uncertified GSB mixes puts your entire project at risk of government audit failure. View all testing services →
How to Get Your GSB Mix Design Done
Send Your Samples
Send representative soil and aggregate samples from your quarry or stockpile. Pack in airtight bags to maintain natural moisture and label with project name, source, and sample ID.
We Test & Design
We run the full suite — grading, Heavy Proctor, CBR, Atterberg Limits, and water absorption — then blend proportions to meet the target MoRTH grading and maximise CBR.
You Get a Complete Design Report
You receive a complete design report ready for site implementation — with combined gradation, MDD/OMC, CBR, and the recommended blend ratio.
| Material | Approximate Quantity |
|---|---|
| Coarse Aggregate (each fraction) | 40–60 kg |
| Fine Aggregate / Crusher Dust | 30–40 kg |
| Binding Soil (if blended GSB) | 25–30 kg |
Send to: No.6, Ganesh Nagar 3rd Street, K.Pudur, Madurai — 625007. WhatsApp before dispatch: +91-8680049004
FAQs
Which GSB tests does Jancy Labs conduct?
Are GSB reports accepted by the PWD and NHAI?
Can I send GSB samples by courier?
Where is Jancy Labs located?
Contact Our Experts
Ensure your road foundation meets every technical benchmark with our professional GSB mix design. Request a quote today and avoid the delays a rejected sub-base can cause.
| Detail | Contact Information |
|---|---|
| 📞 Phone | +91-8680049004 / +91-9994421275 |
| +91-8680049004 | |
| ✉️ Email | jancylabsmdu@gmail.com |
| 📍 Address | No.6, Ganesh Nagar 3rd Street, K.Pudur, Madurai — 625007 |
| 🕐 Hours | Monday to Saturday, 10:00 AM – 6:00 PM |
Request a GSB Mix Design Quote
Share your project scope and our engineers will call you back with a quote.
Standards & Authority Reference Sources
- Ministry of Road Transport & Highways (MoRTH) — Specifications for Road and Bridge Works defining GSB grading envelopes (Table 400-1).
- Bureau of Indian Standards (BIS) — publisher of IS 2720 Part 8 (Compaction), Part 16 (CBR), and Part 5 (Atterberg Limits).
- National Accreditation Board for Testing and Calibration Laboratories (NABL) — verify Jancy Labs' accreditation scope under Certificate TC-12176.
- National Highways Authority of India (NHAI) — granular sub-base quality control and acceptance requirements.
- PMGSY — Pradhan Mantri Gram Sadak Yojana — rural road sub-base specification and quality control.
- Indian Roads Congress (IRC) — IRC:37 flexible pavement design referencing sub-base CBR and thickness.
- NABARD — rural infrastructure funding requirements including material design mix documentation.