‍

Table of Content

‍

Key Takeaways

• IS 10262:2019 is India’s official code for concrete mix proportioning, ensuring strength, durability, and cost-efficiency.
  
• Design Mix (used for >M20 grades) saves up to 15% cement over Nominal Mix methods.
  
• The guide walks through M25 mix design step-by-step—from water-cement ratio to aggregate adjustments.
  
• Learn to factor in seasonal moisture, workability, and exposure conditions using real project examples.
• BuiltX applies these IS standards to NGO and healthcare projects across India—ensuring your concrete is both structurally sound and cost-effective.

‍

IS 10262:2019 is the Indian Standard used for concrete mix proportioning and mix design. It provides a systematic method for determining the proportions of cement, water, fine aggregate, coarse aggregate and admixtures required to achieve the desired strength, workability and durability.

A well-designed concrete mix helps balance structural performance, constructability and material efficiency. Poor proportioning can contribute to problems such as inadequate strength, segregation, excessive cement consumption or difficulty in placing and compacting concrete.

For reinforced concrete work, IS 10262:2019 is used together with IS 456:2000, which provides requirements related to concrete grade, durability, water–cement ratio, cement content and other structural considerations.

Concrete mixes may be proportioned using design-based methods or prescribed nominal proportions depending on the grade, project requirements and applicable code provisions. For structural projects, the selected proportions should be verified through trial mixes and adjusted for actual site materials and moisture conditions.

This guide explains the concrete mix design procedure step by step as per IS 10262:2019, with a worked M25 concrete example covering target mean strength, water–cement ratio, water content, cement content, aggregate proportions, moisture corrections and trial mixes.

‍

Which IS Code Is Used for Concrete Mix Design?

The primary Indian Standard used for concrete mix design is IS 10262:2019 — Concrete Mix Proportioning — Guidelines.

It is used together with IS 456:2000, which provides requirements related to concrete grade, durability, water–cement ratio, cement content and reinforced concrete design.

In simple terms:

• IS 10262:2019 explains how to calculate and proportion the ingredients of a concrete mix.
• IS 456:2000 provides the durability and structural requirements that the concrete mix must satisfy.

For practical mix design, engineers use IS 10262 to determine proportions and then verify that the selected mix also complies with the applicable requirements of IS 456.

Can a building change lives? Discover how construction drives real social impact.

‍

‍

An M25 concrete mix design aims to achieve a characteristic compressive strength of 25 MPa at 28 days while also satisfying the required workability, durability and site conditions.

The mix design process typically includes:

• Calculating the target mean strength
• Selecting the water–cement ratio
• Estimating water content
• Calculating cement content
• Determining fine and coarse aggregate proportions
• Correcting for aggregate moisture and water absorption
• Preparing and testing trial mixes

The final mix proportions should be confirmed through laboratory trials and adjusted for the actual materials used on site.

Step 1: Gather All Required Data for Concrete Mix Design

To design a concrete mix for a specific grade, the following information is essential:

• Grade Designation: Specifies the target strength of the concrete.
• Cement Type and Grade: Type and grade of cement to be used (if applicable).
• Maximum Nominal Size of Aggregate: Determines the largest aggregate size.
• Minimum Cement Content and Maximum Water-Cement Ratio: As specified, or based on exposure conditions.
• Workability: Desired workability at the time of placement.
• Method of Placing: Influences mix design (e.g., pumpable or manual placement).
• Degree of Site Control: Good or fair, or the established standard deviation value.
• Aggregate Types:
  
  • Type of coarse aggregate.
  • Type of fine aggregate.
• Maximum Cement Content: Upper limit for cement usage.
• Chemical Admixtures: Whether used, type, and extent of use.
• Mineral Admixtures: Whether used, type, and extent of use.
• Additional Requirements: Specific needs, such as early-age strength.

Step 2: Calculate Target Mean Strength of Concrete

Select the required concrete grade, classified as 

• Ordinary Concrete: M10, M15, M20
• Standard Concrete: M25, M30, M35, M40, M45, M50, M55
• High Strength Concrete: M60, M65, M70, M75, M80 

‍

In the mix designation, 'M' refers to the mix, and the number indicates the characteristic compressive strength of a 150 mm cube at 28 days (N/mm²). For example, this M25 mix proportion gives a compressive strength of 25 N/mm².

‍

Planning to build a hospital? Don’t miss this breakdown of licensing costs in India.

‍

Table 1: Assumed Standard Deviation (Reference Clause 4.2.1.3, IS 10262: 2019)

Note:

• If test results are unavailable, standard deviation values from Table 1 can be assumed for initial design, which corresponds to good site control (proper cement storage, weight batching, controlled water addition, regular checks on materials, aggregate grading, moisture content, workability, and strength).
• For fair site control (deviations from good control), increase standard deviation by 1 N/mm².

‍

Step 3: Choose the Correct Water-Cement Ratio in Concrete Mix Design

Determine the w/c ratio based on the 28-day compressive strength, using curves:

• Curve 1: Compressive strength of cement used from 33 to <43 N/mm² 
• Curve 2: Compressive strength of cement used from 43 to <53 N/mm² ‍
• Curve 3: Compressive strength of cement used ≥53 N/mm²

Note:

• Check the selected w/c ratio against the maximum w/c ratio for durability and adopt the lower value.

‍

Table 2: Requirements of Durability (Reference Section 8.2, IS 456: 2000)

‍

Step 4: Estimate Entrapped Air Content Based on Aggregate Size

Approximate entrapped air content in normal concrete is given by below table.

‍

Table 3: Appropriate air content (Reference Clause 5.2, IS 10262: 2019)

For 20 mm nominal maximum aggregate size: 1% of concrete volume.

Step 5: Select Water Content and Make Water Adjustments

Determine water content per m³ of concrete from below table.

‍

Table 4: Water content (Reference Clause 5.3, IS 10262: 2019)

‍Note:

• The water content in the above table is for SSD aggregates, angular coarse aggregates, and having 50 mm slump.

‍

Example:

For 20 mm aggregate: Water content = 186 kg/m³.

‍

Water Corrections:

1. Based on type of aggregate:

Table 5: Water correction for aggregate type based on shape

‍

2. Based on slump value: 

‍

Table 6: Water correction for slump value

‍

3. Based on chemical admixtures:

‍

Table 7: Water correction for use of admixture

‍

Step 6: Calculation of Cement Content

Calculate cement content using the w/c ratio and water content:

‍

Mass of cement = Water content / w/c

‍

Note:

• Check against minimum cement content for durability (Table 2) and adopt the higher value.

For purpose-driven NGOs and non profits, here’s the construction company making infrastructure truly impactful.

‍

Step 7: Determine Volume of Coarse Aggregate from Grading Zone and Size

Determine the volume ratio of coarse aggregate to total aggregate from below table.

‍

Table 8: Volume of coarse aggregate per unit volume of total aggregate (Reference Clause 5.5, IS 10262: 2019)

Note: 

• These ratios are applicable for w/c = 0.5
• For pumpable concrete: Reduce ratio by up to 10%

‍

Corrections:

‍

Table 9: Correlation of w/c and change in ratio of volume of coarse aggregate to total volume of aggregate

‍

Explore India’s top construction company specializing in purpose-driven and nonprofit infrastructure projects.

Step 8: Calculate Quantities of Fine and Coarse Aggregates

Calculate aggregate volumes by subtracting the volumes of cement, water, and entrapped air from the total concrete volume (1 m³). Distribute the remaining volume based on the coarse aggregate ratio.

‍

How safe is your construction site? Trace the evolution of worker safety rules and gear.

‍

Step 9: Adjust for Aggregate Absorption and Moisture (Seasonal Correction)

Adjust water content based on aggregate absorption capacity and moisture content.

‍

‍

Assumptions used in this example

• Grade: M25
• w/c adopted: 0.44
• Slump: 75 mm
• Nominal max aggregate: 20 mm
• Zone: II
• Entrapped air: 1%

Final mix (example output)

• “Season changes water contribution due to free moisture; w/c stays the design basis, water quantity changes.”
• “Always validate with trial mixes and strength tests before finalizing for production.”

Planning to build a hospital in 2025?Don’t commit funds until you’ve seen the latest cost benchmarks and design insights.

Step 10: Conduct Trial Mixes and Optimize the Design

Verify the mix proportions through trial batches:

• Measure workability of Trial Mix No. 1.
• Prepare two additional trial mixes (No. 2 and 3) with the same water content as Trial Mix No. 1 but vary the w/c ratio by ±10% while maintaining workability requirements.

‍

Getting your concrete mix proportions right isn’t just about passing a lab test—it’s about ensuring long-term strength, workability, and cost-efficiency on site. With the IS 10262:2019 mix design method, you can confidently calculate everything from the target compressive strength to the exact quantities of cement, water, and aggregates—while meeting durability requirements laid out in IS 456:2000.

‍

Whether you’re preparing an M25 concrete mix, adjusting for seasonal moisture, or planning a trial batch, this step-by-step guide ensures your design is both technically sound and field-ready.

‍

At BuiltX, we help project teams across Delhi NCR, Bihar, Jharkhand, and West Bengal apply these IS standards to design mix India-wide for NGO and healthcare projects. Our engineers work closely with NGO construction partners, hospitals, and contractors to ensure every batch meets structural and sustainability benchmarks.

‍

Have a BOQ or site condition that needs validation? We’ll review your mix design, water-cement ratio, and durability grade—for free. Book a 20-minute call with our engineer

‍

1. Is IS 10262 used for concrete mix design?

Yes. IS 10262:2019 is the Indian Standard used for concrete mix proportioning. It provides the procedure for determining the quantities of cement, water, fine aggregate, coarse aggregate and admixtures required for a concrete mix.

2. Which IS code is used for concrete mix design?

The primary code used for concrete mix design in India is IS 10262:2019 — Concrete Mix Proportioning — Guidelines. It is used along with relevant requirements of IS 456:2000 for durability and reinforced concrete design.

3. What is the latest revision of IS 10262?

The current commonly referenced edition is IS 10262:2019. Before using the standard for a project, engineers should verify the latest status and amendments through the Bureau of Indian Standards.

4. What is the standard mix design of concrete?

There is no single universal mix ratio for design-mix concrete. The proportions depend on factors such as required concrete grade, target strength, workability, exposure condition, aggregate properties and water–cement ratio. IS 10262 provides the procedure for calculating these proportions.

5. What is M25 concrete mix design as per IS 10262:2019?

M25 concrete has a characteristic compressive strength of 25 MPa at 28 days. Its design mix is calculated using IS 10262:2019 by determining the target mean strength, water–cement ratio, water content, cement content and fine and coarse aggregate quantities, followed by trial mixes.

6. What is the difference between IS 10262 and IS 456?

IS 10262:2019 provides the method for proportioning concrete ingredients, while IS 456:2000 provides broader requirements for plain and reinforced concrete, including durability, structural design and material requirements. The two standards are used together in concrete design.

7. Where can I get the official IS 10262:2019 PDF?

The official IS 10262:2019 standard should be accessed through the Bureau of Indian Standards or its authorised standards platform. Avoid relying on unofficial PDF copies because they may be incomplete or outdated.

8. What is the concrete mix design procedure as per IS 10262?

The typical concrete mix design procedure includes determining target mean strength, selecting the water–cement ratio, estimating water content, calculating cement content, determining aggregate proportions, applying moisture corrections and validating the final proportions through trial mixes.

‍