As per IS 10262:2009, what is the maximum mixing water content per unit volume of concrete for 20 mm nominal maximum size angular coarse aggregate, considering a slump range of 25 to 50 mm?

Explanation:

According to IS 10262:2009, the maximum water content for concrete is influenced by the nominal maximum size of the coarse aggregate and the slump range.

1. Nominal maximum size of coarse aggregate: For a 20 mm nominal maximum size of angular coarse aggregate, the IS 10262 provides specific guidelines for the mixing water content.

2. Slump range of 25 to 50 mm: This indicates a medium workability requirement, which is typical for normal-strength concrete.

3. From IS 10262:2009, for 20 mm nominal maximum size angular coarse aggregate and a slump of 25-50 mm, the maximum mixing water content is 186 kg/m³.

 Additional Information

1. Water-cement ratio: IS 10262 specifies the water-cement ratio based on the desired strength and workability. The mix should be designed to achieve the required strength while ensuring adequate workability and durability.

2. Importance of water content: Proper water content is critical to the hydration process of the cement, which affects the strength and durability of the concrete. Too much water can lead to segregation and reduced strength, while too little water can result in poor workability.