PACKING DENSITY OF AGGREGATE
The packing density of aggregate gives an indication of how efficiently aggregate fill a certain volume and for that reason is such an important concept in concrete technology.
Aggregate Specification
HOW TO DECIDE MAXIMUM SIZE OF COARSE AGGREGATE TO BE USED IN CONCRETE?
For the same strength or workability, concrete with large size aggregate will require lesser quantity of cement than concrete with a smaller size aggregate. In a mass concrete work the use of larger size aggregate will be useful due to the lesser consumption of cement. This will also reduce the heat of hydration and the … Read more
HOW TO INSPECT PHYSICAL CHARACTERISTICS OF AGGREGATE USED IN CONCRETE?
While inspecting aggregate for quality control purpose, it is required to describe its physical properties, because physical properties of aggregate have an effect on the property of concrete. The physical properties of aggregate which should be described are given below. Name of parent rock & Group name Particle Shape Surface Texture Let us see how … Read more
WHAT IS THE GRADING LIMIT OF SAND FOR PLASTER WORK?
Sand used for plaster work can be natural sand, crushed stone sand or crushed gravel sand. The grading limit of sand for plaster work; for internal and external wall and ceiling should be as given in the table below. Grading Limit of Sand for Plaster Work IS Sieve Size Percentage Passing 10 mm 100 4.75 … Read more
WHAT IS THE GRADING LIMITS OF ALL IN AGGREGATE?
Grading Limit of All in Aggregate Sieve Size Percentage of Passing For All-in-Aggregate 40 mm Nominal Size 20 mm Nominal Size 80 mm 100 – 40 mm 95 – 100 100 20 mm 45 – 75 95 – 100 4.75 mm 25 – 45 30 – 50 600 micron 8 – 30 10 – … Read more
WHAT IS THE GRADING REQUIREMENT OF SAND FOR USE IN MASONRY MORTAR?
The sand which is used in mortar can be natural sand, or crushed stone sand or crushed gravel sand. Sand or fine aggregate which is used in concrete is somewhat different from sand which is used for masonry mortar. The role of sand in mortar is to give the following properties such as Strength Workability … Read more
FINENESS MODULUS OF AGGREGATE – WHAT, WHY & HOW
What is Fineness Modulus of Aggregate? Fineness modulus is an empirical factor obtained by adding the cumulative percentages of aggregate retained on each of the standard sieves ranging from 80 mm to 150 micron and dividing this sum by 100. Why to Determine Fineness Modulus? Fineness modulus is generally used to get an idea of … Read more
AGGREGATE IMPACT VALUE TEST-10+ IMPORTANT NOTES TO REMEMBER
Aggregate impact value test gives an indication of aggregate’s toughness property (i.e. property of a material to resist impact) Aggregate impact values are used to classify the stone aggregates with respect to toughness property as given below. Aggregate impact value (%) Toughness Properties <10 Exceptionally tough / Strong 10 – 20 Very tough / Strong … Read more
HOW TO CLASSIFY AGGREGATES ACCORDING TO SIZE?
According to size the aggregates are classified as: Fine Aggregate Coarse Aggregate All in Aggregate Fine Aggregate It is the aggregate most of which passes 4.75 mm IS sieve and contains only so much coarser as is permitted by specification. According to source fine aggregate may be described as: Natural Sand– it is the aggregate … Read more
HOW TO CLASSIFY AGGREGATE ACCORDING TO NATURE OF FORMATION?
One of the first field investigations for a concrete construction project is to search for sources of aggregates which will give material of good quality at economical rates. Suitability of aggregate will depend upon the geological history of the region. The aggregate as per nature of formation may be divided into two types. Natural Aggregates … Read more