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A procedure for mixing 25MPa concrete with a small 180l concrete mixer without additives?
Proportions for different grades:
Cement : Sand : Gravel
1 : 2 : 5 for grade C15(general purpose concrete) 15 mpa
1 : 2 : 4 for grade C25(strong) 25 mpa
1 : 2 : 3 for grade C30(very strong) 30 mpa
Remember the proportion is done in terms of volume. This means the above proportions are
correct if using the same measure.
What else can I help you with?
What is correlation between strength of mortar to strength of concrete?
mortar are mixing by sand & cement and concrete is mixing by cement, sand & stone
Does mixing cement weigh the same as dried concrete?
no
What are the causes of bleeding in concrete?
exceed mixing and compacting
Will concrete explode?
Concrete itself does not explode, but it can break apart or spall if subjected to extreme heat, pressure, or chemical reactions. For example, when exposed to high temperatures, the moisture trapped within the concrete can vaporize, leading to explosive spalling. Additionally, certain additives or poor mixing can create conditions that might result in cracking or fragmentation. Overall, while concrete won't explode spontaneously, it can fail dramatically under specific circumstances.
How can concrete be strengthened?
by mixing a nano-sized additive with cement.
How can you ensure that posts are set in concrete without mixing?
To ensure that posts are set in concrete without mixing, you can use pre-mixed concrete that only requires water to be added. This eliminates the need for mixing on-site and helps maintain the integrity of the concrete when setting the posts.
What is the difference between additives and admixtures?
Additives are substances added to a material to improve or alter its properties, while admixtures are specific types of additives used in concrete to modify its properties. Admixtures are typically used in construction to enhance the performance of concrete, such as improving workability, strength, or durability.
What are phases of concrete?
The phases of concrete are mixing, placement, compaction, curing, and finishing. Mixing involves combining cement, water, aggregates, and additives. Placement refers to pouring the concrete into the formwork. Compaction is the process of removing air voids from the concrete mixture. Curing involves keeping the concrete moist and at the right temperature for hydration to occur. Finishing includes troweling, texturing, and shaping the surface of the concrete.
What is correlation between strength of mortar to strength of concrete?
mortar are mixing by sand & cement and concrete is mixing by cement, sand & stone
Can you buy a concrete mix in a premixed bag and will turn white?
Yes, you can buy concrete mix in a premixed bag that will turn white when mixed with water. These types of mixes are typically referred to as white cement or white concrete mixes, which contain white aggregates or additives to achieve the desired color. Just follow the manufacturer's instructions for mixing and placing the concrete to ensure the best results.
Why does a flash set happen in concrete?
A flash set can occur in concrete when the cement mixture hardens rapidly due to factors like high temperatures, improper mixing, or the use of certain additives. This can result in decreased workability and potentially compromise the overall strength and durability of the concrete.
Is a concrete natural material?
No, concrete is not a natural material; it is a man-made composite. It is primarily composed of cement, water, aggregates (like sand and gravel), and sometimes additives. While some of its components, like sand and gravel, are natural materials, the process of mixing and curing them to create concrete involves human intervention, making it an artificial product.
What is the best method for creating the strongest concrete mix for a construction project?
The best method for creating the strongest concrete mix for a construction project is to carefully follow the recommended mix design provided by a structural engineer or concrete supplier. This typically involves using the right combination of cement, aggregates, water, and additives in the correct proportions, as well as ensuring thorough mixing and proper curing of the concrete.
What are the causes of bleeding in concrete?
exceed mixing and compacting
Does mixing cement weigh the same as dried concrete?
no
What is the concrete mixing ratio in C30 concrete as per British standards?
1:2:4
Will concrete explode?
Concrete itself does not explode, but it can break apart or spall if subjected to extreme heat, pressure, or chemical reactions. For example, when exposed to high temperatures, the moisture trapped within the concrete can vaporize, leading to explosive spalling. Additionally, certain additives or poor mixing can create conditions that might result in cracking or fragmentation. Overall, while concrete won't explode spontaneously, it can fail dramatically under specific circumstances.
