Classification of aggregates according to size and shape
- Shape and Texture classification
- HOW TO CLASSIFY AGGREGATES ACCORDING TO SIZE?
- HOW TO CLASSIFY AGGREGATE ACCORDING TO ITS SHAPE?
Shape and Texture classification
Classification of aggregates based on shape and size such as coarse and fine Aggregates are classified according to shape into the following types. Rounded.and
Hi, Garsa is a place near to Bajaura, Bhunter at a distance of about 8 km from Bajaura. Recently I was nearby to this place and was told a Monday, January 20, Classification of Aggregates. Hi, Aggregates are used for the manufacturing of the concrete. Aggregates are classified into two categories according to their size: Coarse Aggregates These are the aggregates which have sizes more than 4. In laboratories they are separated as the aggregates which are retained on the BIS test sieve no. Generally, broken stones are used as the coarse aggregates.
It gives minimum ratio of surface area to given volume and hence requires minimum water for lubrication. It gives good workability for the given amount of water and hence needs less cement for a given water cement ratio. The only disadvantages is that the interlocking between its particles is less and hence the development of bond is poor. This is why rounded aggregate is not suitable for high strength concrete and for pavements subjected to tension. It gives lesser workability than rounded aggregate for the given water content.
Back to Main Page. Coarse Aggregate Gravel. As mentioned earlier, coarse aggregates are stones that are retained on 4. Nearly all natural aggregates originate from bed rocks. There are three kinds of rocks, namely, igneous, sedimentary and metamorphic.
It is the aggregate most of which passes 4. According to source fine aggregate may be described as:. According to size the fine aggregate may be described as coarse sand, medium sand and fine sand. IS specifications classify the fine aggregate into four types according to its grading as fine aggregate of grading Zone-1 to grading Zone The four grading zones become progressively finer from grading Zone-1 to grading Zone It is the aggregate most of which is retained on 4.
Aggregate size applied in concrete can vary from less than one-tenth of a millimetre to tens of millimeters. In the concrete mix, aggregate particles of different sizes are incorporated. Grading is the term given to the particle size distribution. In manufacturing concretes with low-grades, aggregate from deposits containing a whole range of sizes, from the largest to the smallest, is sometimes used; this is referred to as all-in or pitrun aggregate. But, in good quality concretes, the aggregate applied contains at least two size groups:.
HOW TO CLASSIFY AGGREGATES ACCORDING TO SIZE?
HOW TO CLASSIFY AGGREGATE ACCORDING TO ITS SHAPE?