SK SAXENA PMP PM Consultant
The compacting factor test process has an element of external force in it, compared to the slump test. This test measures the compactability of concrete, depending upon the external force application.
Fresh concrete is required to assess the workability of concrete and such concrete should be sampled out of manufactured concrete so as to be a representative sample of the batch concrete.IS:1199 part 1 suggest about sampling of fresh concrete.
IS 2386 2016 Part 3 Method of test for Aggregates for Concrete- Part- III Specific Gravity, Density, Voids
Absorption and Bulking.)
The ‘aggregate crushing value’ gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load.
The rock anchors are of various types and are manufactured by different agencies. The anchor pull-out test is done to get assistance in design and acceptance after installation. The types of tests and methods of testing are discussed with special emphasis on the rebar anchors, widely used in construction of tunnels, caverns and rock slope stabilisation
The soundness test determines an aggregate’s resistance to disintegration by weathering and freeze-thaw cycles.
In Los Angeles test for finding abrasion value of the aggregates, the aggregates and abrasive charge are placed together in a drum. The drum is rotated to 500 revolution or 1000 revolution depending upon the gradings of aggregate.
The fines generated during this action after passed through 1.72 mm sieve. The amounts passing through is used for getting an inference about the abrasion value and the use of the aggregates.
The elongation index of an aggregate is the percentage by weight of particles whose greatest dimension ( length) is greater than one and four-fifths times their mean dimension.
IS: – 2386 (Part – I) 2016 Method of test for aggregates for Concrete – Particle Size and Shape (Coarse aggregates)
The flakiness index of an aggregate is the percentage by weight of particles in it whose least dimension (thickness) is less than three-fifths of their mean dimension.
Fineness Modulus of sand is a number which represents the mean size of the particles in sand. It is calculated by performing sieve analysis with standard sieves (4.75 mm to 150 micron). The cumulative percentage retained on each sieve is added and divided by 100 to gives the value of fineness modulus.
