Table of Contents
- 1 Which shape of aggregate is best for concrete?
- 2 Which type of aggregate grade is preferable in concrete?
- 3 Which shape aggregates are not good for concrete?
- 4 Which aggregate gives maximum strength concrete?
- 5 Which aggregate gives higher strength in concrete?
- 6 What are angular aggregates?
- 7 What are the advantages of angular aggregates?
- 8 Why is the shape of the aggregate important in concrete?
- 9 What is the difference between crushed aggregate and rounded aggregate?
Which shape of aggregate is best for concrete?
The shape and texture of aggregate affects the properties of fresh concrete more than hardened concrete. Concrete is more workable when smooth and rounded aggregate is used instead of rough angular or elongated aggregate.
Which type of aggregate grade is preferable in concrete?
Fine-aggregate grading within the limits of ASTM C 33 (AASHTO M 6) is generally satisfactory for most concretes. The ASTM C 33 (AASHTO M 6) limits with respect to sieve size are shown in Table 5-3.
Which shape aggregates are not good for concrete?
When the aggregate length is larger than its width and width is larger than its thickness then it is said to be flaky and elongated aggregates. The above 3 types of aggregates are not suitable for concrete mixing. These are generally obtained from the poorly crushed rocks.
What is rounded aggregate?
Rounded – Natural aggregates smoothed by weathering, erosion and attrition. Rocks, stone, sand and gravel found in riverbeds are your most common rounded aggregates. Rounded aggregates are the main factor behind workability.
Why is angular aggregate used?
Angular aggregates have higher specific surface area than smooth rounded aggregate. With a greater specific surface area the angular aggregate may show higher bond strength than rounded aggregates. Also, angular aggregates exhibit a better interlocking effect in concrete that contributes in strength of concrete.
Which aggregate gives maximum strength concrete?
Although the water / cementious material ratio is an important factor affecting the strength of concrete, the aggregate properties can not be ignored.
Which aggregate gives higher strength in concrete?
Cubical aggregate has maximum strength in concrete as it has good packing and strength in all direction. Rounded aggregate is not suitable for concrete.
What are angular aggregates?
The angular aggregates consist well defined edges formed at the intersection of roughly planar surfaces and these are obtained by crushing the rocks. Angular aggregates result maximum percentage of voids (38-45\%) hence gives less workability.
What is the advantage of aggregate over the rounded aggregate?
The higher surface area of angular aggregate with rough texture requires more water for a given workability than rounded aggregate. This means that for a given set of conditions from the point of view of water-cement ratio and consequent strength, rounded aggregate gives higher strength.
What is advantage of using rough textured or angular aggregates?
The total surface area of rough textured angular aggregate is more than smooth rounded aggregate for the given volume. By having greater surface area, the angular aggregate may show higher bond strength than rounded aggregate.
What are the advantages of angular aggregates?
1.Angular Aggregates exhibit a better interlocking effect in concrete, which property makes it superior in concrete used for roads & pavements. 2.The total surface area of angular aggregate is more than rounded aggregate.Thus they show higher bond strength.
Why is the shape of the aggregate important in concrete?
The shape of the aggregate is a crucial characteristic because it impacts the workability & strength of the concrete. In general, the angular aggregate is desirable for round and smooth sets for the following reasons: The angular aggregate shows a better interlocking effect which gives a better concrete.
What is the difference between crushed aggregate and rounded aggregate?
This means that for a given set of conditions from the point of view of water-cement ratio and consequent strength, rounded aggregate gives higher strength. For a water-cement ratio below 0.4, the use of crushed aggregate has resulted in strength upto 38\% higher than rounded aggregate.
What are the different types of aggregates?
According to shape the aggregate is classified as Rounded aggregate Irregular or partly rounded aggregate Angular aggregate Flaky aggregate Elongated aggregate Flaky and elongated aggregate