The ratio of concrete mix components, including ballast, typically varies based on the desired strength of the concrete and specific project requirements. In general, the mix ratio for C20 concrete using ballast should be 1:6 (1 part cement to 6 parts ballast), while the mix ratio for C25 concrete using ballast should be 1:5 (1 part cement to 5 parts ballast).

C20 concrete mix refers to a specific blend of concrete that is designed to have a compressive strength of 20 megapascals (MPa) after 28 days of curing. The “C” stands for concrete, and the number following it indicates the minimum compressive strength of the concrete in MPa.

Ballast is a dense mixture of sand and gravel crushed small rock stone that’s form rough coarse aggregate used in extensive range of construction application, primary it is used for heavy duty work and making concrete.

When you are thinking about a new project making of Pathway, driveway, patio and slab, there is need of concrete mix to pour, so there is mixing of cement, ballast and water in required proportion and quantity to achieve targeted compressive strength.

**What is the ratio of C20, C25, C30, C35 and C40 concrete mix using ballast**

Typically, with a standard 1:5 mix there are about 7 25 kg bags of cement per ton bag of ballast, with a 1:4 ratio there are 9 bags of cement per ton of ballast and with a 1:6 mix there are 6 bags of cement per ton of ballast.

Generally for a C20 concrete mix using ballast, the typical mix ratio is typically 1 part cement to 2 parts sand to 4 parts coarse aggregate by volume, which is often written as 1:2:4.

**What is the ratio of C20 concrete mix using ballast**

For a C20 concrete mix using ballast, the typical mix ratio is usually 1 part cement to 6 parts ballast by volume. This ratio is often written as 1:6. If you use sand and aggregate separately, the mix ratio for C20 concrete is 1 part cement, 2 parts sand and 4 parts coarse aggregate, which is often stated as 1:2:4.

To produce 1 m3 of C20 concrete mix with a mixing ratio of 1:6 from 1 part cement to 6 parts ballast, approximately 12 x 25 kg bags of cement and 2 bulk bags of ballast are required. If you use sand and aggregates separately, you usually need 0.22 m3 of cement, 0.44 m3 of sand and 0.88 m3 of coarse aggregates to make 1 m3 of C20 concrete mix.

**What is the ratio of C25 concrete mix using ballast**

For a C25 concrete mix using ballast, the typical mix ratio is usually 1 part cement to 5 parts ballast by volume. This ratio is often written as 1:5. If you use sand and aggregate separately, the mix ratio for C25 concrete is 1 part cement, 2 parts sand and 3 parts coarse aggregate, which is often stated as 1:2:3.

To produce 1 m3 of C25 concrete mix with a mixing ratio of 1:5 from 1 part cement to 5 parts ballast, approximately 14 x 25 kg bags of cement and 2 bulk bags of ballast are required. If you use sand and aggregates separately, you usually need 0.256 m3 of cement, 0.513 m3 of sand and 0.77 m3 of coarse aggregates to make 1 m3 of C25 concrete mix.

**What is the ratio of C30 concrete mix using ballast**

For a C30 concrete mix using ballast, the typical mix ratio is usually 1 part cement to 4 parts ballast by volume. This ratio is often written as 1:4. If you use sand and aggregate separately, the mix ratio for C30 concrete is 1 part cement, 1.5 parts sand and 3 parts coarse aggregate, which is often stated as 1:1.5:3.

To produce 1 m3 of C30 concrete mix with a mixing ratio of 1:4 from 1 part cement to 5 parts ballast, approximately 16 x 25 kg bags of cement and 2 bulk bags of ballast are required. If you use sand and aggregates separately, you usually need 0.31 m3 of cement, 0.46 m3 of sand and 0.93 m3 of coarse aggregates to make 1 m3 of C30 concrete mix.

**What is the ratio of C35 concrete mix using ballast**

For a C35 concrete mix using ballast, the typical mix ratio is usually 1 part cement to 3 parts ballast by volume. This ratio is often written as 1:3. If you use sand and aggregate separately, the mix ratio for C35 concrete is 1 part cement, 1 parts sand and 2 parts coarse aggregate, which is often stated as 1:1:2.

To produce 1 m3 of C35 concrete mix with a mixing ratio of 1:3 from 1 part cement to 3 parts ballast, approximately 20 x 25 kg bags of cement and 2 bulk bags of ballast are required. If you use sand and aggregates separately, you usually need 0.51 m3 of cement, 0.51 m3 of sand and 1.03 m3 of coarse aggregates to make 1 m3 of C35 concrete mix.

**What is the ratio of C40 concrete mix using ballast**

A common ratio for C40 concrete mix using ballast might be approximately 1 part cement, 1 parts sand, 1.5 parts aggregate (ballast), and around 0.4 parts water, which is often written as 1:1:1.5. You usually need 0.62 m3 of cement, 0.62 m3 of sand and 0.92 m3 of coarse aggregates to make 1 m3 of C40 concrete mix.

**Conclusons:**

A common ratio for C20 concrete mix using ballast might be approximately 1 part cement, 2 parts sand, 4 parts aggregate (ballast), and around 0.5 parts water, which is often written as 1:2:4.