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Concrete mix design is the process of finding the proportions of concrete mix in terms of ratios of cement, sand and coarse aggregates.
specifications. Concrete Mix Design Procedure as per is 10262 – 2009. Procedure for concrete mix design requires following step by step process: Calculation of target strength of concrete. Selection of water-cement ratio. Determination of aggregate air content. Selection of water content for concrete. Selection of cement content for concrete.
- Adjustment
- Reduce the selected value by 25kg
- Reduce the selected value by 20kg
- Reduce the selected value by 10%
- Concrete Mix Design Objectives
- Factors Influencing The Choice of Design Mix of Concrete
- Factors Influencing Concrete Consistency (Slump)
- Factors Affecting Strength of Concrete
- Concrete Mix Design Methods
- Design Mix of Concrete – Detailed Procedure For M30 Structure as Per Is: 10262
Meet the minimum compressive strength required from structural consideration.Fulfil all requirements like durability to resist the environment in which the structure is exposed during service.Adequate workability necessary for easy compaction with the available equipment.Fulfil site requirements, especially the methods of concrete production, transport, placement, compaction and finishing.Minimum w/c ratio for strength and durability can be achieved by increasing cement content and lowering the water content. Water demand can be lowered by controlling aggregate grading and using wat...Workability increases with maximum aggregate size. However, the smaller size of aggregate provides a larger surface area for bonding with mortar matrix giving higher strength.Grading of concrete aggregate: Relative proportions of coarse and fine aggregates play an essential role, and for dense concrete mix, the aggregates must be well graded.Minimum cement content in concrete: As per MORTH, Section 1700, Table 1700-2 For Bridges With Prestressed Concrete or those with Individual Span Lengths More than 60.0 M or those that are Built wit...From the design mix of concrete, the consistency of freshly mixed concrete depends on several factors, which are as follows: 1. Water Content 2. Water cement ratio 3. Fineness Modulus of aggregate 4. Use of Water reducing admixture(Plasticizers or Superplasticizers) 5. Type and shape of aggregates 6. Entrained air content 7. Some secondary factors ...
Hardened concrete strength from a design mix of concrete depends on several factors, which are as follows: 1. Water cement ratio 2. Strength of cement used 3. Type and shape of the aggregate 4. Entrained air Content 5. There are some secondary factors too, such as Mix temperature, etc.
IS MethodACI MethodRoad Note Method(UK Method)IRC44 MethodA Stipulations for Proportioning:
1. Grade designation : 30 N/mm2 2. Type of cement: OPC 43 grade conforming to IS 8112 3. Maximum size of aggregate: 20 mm 4. Cement Content( Min): 310Kg as per Table No-1700-3 of MoRT&H 5. Water-Cement Ratio(Max): 0.45 as per Table No-1700-3 of MoRT&H 6. Degree of workability: 100mm Slump 7. Type of exposure: Moderate 8. Methode of concrete placing: Manually 9. Degree of supervision: Good 10. Aggregate: Crushed angular aggregate 11. Chemical admixture type: Superplsticizer as per IS 9103
Test Data for Materials:
1. Cement Used: OPC 43 grade conforming to IS 8112, Specific Gravity: 3.15 2. Chemical admixture: Conforming to IS 9103, Specific Gravity: 1.225, Dosage: 1.1 3. 20mm coarse aggregate: Specific Gravity 2.88, Water absorption 0.59 4. 10mm coarse aggregate: Specific Gravity 2.88, Water absorption 0.72 5. Fine aggregate(River sand): Specific Gravity 2.66, Water absorption 1.78 6. Water: Specific Gravity 1.00 7. Combined proportion of coarse aggregates: 20mm aggregate(m) 60 %, 10mm aggregate(n) 40...
Determine Target mean strength of concrete:
Target Mean Strength: 42 N/mm2 for M30 grade concrete as per section 1700, Table No.1700-5 of MoRT&H. or, As per IS:456-2000, Target mean strength of concrete(ft) ft = fck + k. s where ft = target mean compressive strength at 28 days, fck = Characteristic compressive strength at 28 days, k = usually 1.65 as per is 456-2000, s = standard deviation. Also, Read: Defects in Concrete Structure – Types – Causes and Condition Survey
Concrete mix design plays a crucial role in achieving the desired properties and performance of concrete. Table of Contents. Importance of Proper Concrete Mix Design. Components of Concrete Mix. 1. Cement. 2. Aggregates. 3. Water. 4. Admixtures. Factors Influencing Concrete Mix Design. Steps in Concrete Mix Design Process.
Considering that the air content in normal (non-air entrained) concrete is not of much significance in mix proportioning procedure and is also not a part of IS 456 : 2000, the consideration of air content has been deleted. Concrete has become an indispensable construction material.
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Mar 14, 2024 · Important Point. The M30 concrete mix ratio is a proportion of ingredients used to achieve a particular strength in concrete. The ratio is 1:0.75:1.5, which means for every 1 part cement, you need 0.75 parts sand and 1.5 parts aggregates when making 1 cubic meter of concrete. Concrete Mix Design IS Code.
Apr 8, 2014 · Concrete Mix Design. This method of concrete mix design consist of following 11 steps. Design specification; Testing of materials; Calculating target strength for mix proportioning; Selecting water/cement ratio; Calculating water content; Calculating cement content; Finding out volume proportions for Coarse aggregate & fine aggregate; Mix ...
