20 mm thick coarse aggregate use in slab cast
Nominal size is the size of the largest aggregate in a grading.
Nominal size in aggregate refers to the labeled size of the aggregate material, typically expressed in inches or millimeters. It indicates the approximate largest dimension of the particles, but does not specify their actual size distribution or gradation. For example, a nominal size of ¾ inch means that the majority of the aggregate particles are around this size, but there may be smaller and larger particles present as well. This term is commonly used in construction and civil engineering to specify aggregate for concrete and asphalt mixes.
20 mm thick coarse aggregate use in slab cast
Larger the size of aggregate will decrease strength of the concrete because surface area of this aggregate is low.Lesser the size of the aggregate will lead to increase the strength of the concrete.Well graded aggregate have all size of particles hence particle interferance is neglected,thus strength of concrete is more.
That is the average size of the stones in aggregate. They are commonly 1/4 , 1/2 , 3/4 and 1 inch.
The average size of fine aggregate is typically measured using a sieve analysis, where the aggregate is passed through a series of sieves with different mesh sizes to determine the distribution of particle sizes. For coarse aggregate, a similar sieve analysis is conducted, but it often involves larger mesh sizes. The average size can be calculated by determining the weight of aggregate retained on each sieve and then using these weights to find a weighted average particle size. Additionally, tools like the geometric mean can also be employed for more precise measurements.
There are two different types of aggregates namely,Fine aggregates - size of the aggregate is less than 4.75 mmExample : SandCoarse aggregates - Size of the aggregate is more than 4.75 mmExample : Gravel
Fine aggregates are the aggregates whose size is less than 4.75 mm.Example: Sand is used as fine aggregate in the preparation of concrete and cement mortar.
The maximum size of aggregate allowed in concrete for testing air content by the pressure method is typically 1 inch (25 mm). This limit ensures that the test accurately measures the air content without interference from larger aggregate particles. For aggregates larger than this size, alternative testing methods may be required.
It would depend on the size of the aggregate
Uniformly graded aggregate consists of particles that are similar in size, leading to a consistent distribution of aggregate sizes within the material. This type of aggregate typically has a narrow range of particle sizes, which can enhance workability and reduce voids in concrete or asphalt mixtures. The uniformity in size can improve the compaction and strength of the final product, making it suitable for specific engineering applications. However, it may also lead to a less efficient packing density compared to well-graded aggregates.
For plain cement concrete, the aggregate used is of size 20 mm. For RCC structures, it is 40mm and for roads, it is 80mm