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Coarse Aggregate Density Test Set Manufacturer,Supplier and Exporter in India

Product Code : EL-CL-8852
Jlab Export is a leading Coarse Aggregate Density Test Set Manufacturer,and suppliers in India

Specific gravity and water absorption of coarse aggregate are found with this set. A wire mesh basket hangs from a buoyancy balance into a water tank, so one sample can be weighed in water and then in air. The balance takes 8000 g and suits aggregate between 63 mm and 5 mm.

Specifications

Use	Density and specific gravity of coarse aggregate
Buoyancy balance	8000 g capacity, for aggregate from 63 mm to 5 mm
Density basket	203 mm dia x 203 mm deep, reinforced no. 8 wire mesh
Sieve	8 in brass, no. 4 mesh
Pan	One, galvanised
Suspension	Hook for the basket
Water tank	400 x 400 x 330 mm approx. (L x W x H)
Power	220 V AC, 50/60 Hz
Minimum order quantity	10 units
Dispatch time	Usually 4–6 working days
Manufacturer	JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India

Weighing Aggregate in Water and Air

Wash the sample on the no. 4 sieve to remove dust and fines, then soak it in water. Weigh it in the basket under water, take it out, roll it in a cloth until the surface film is gone and weigh it surface-dry. Finally dry it in an oven and weigh it again. These three masses give the specific gravity on an oven-dry and a surface-dry basis, the apparent specific gravity and the water absorption.

Aggregate Practicals for Civil Engineering Students

Students test coarse aggregate from two sources and compare the specific gravity and absorption of each. Reducing the field sample in Sample Splitters (Riffle Boxes) keeps the test portion representative, and the oven-dry mass is taken after drying in a Drying Oven.

The results feed into a concrete mix design. Absorption tells how much water the dry aggregate will take from the mix, and specific gravity converts batch masses to volumes. Grading the same aggregate with Test Sieves completes the tests before trial mixing.

Frequently Asked Questions

What size of aggregate can be tested?
The set suits coarse aggregate between 63 mm and 5 mm. Material passing the no. 4 sieve is washed off first, so only the coarse fraction goes into the basket.

What does saturated surface-dry mean?
It is the state where the pores of the aggregate are full of water but the outer surface is dry. The soaked sample is rolled in a cloth until the shiny film of water disappears, then weighed.

How are the results worked out?
Take A as the oven-dry mass, B as the surface-dry mass and C as the mass in water. Oven-dry specific gravity is A divided by (B minus C), and apparent specific gravity is A divided by (A minus C). Absorption is (B minus A) as a share of A.

Why is the basket made of wire mesh?
Water flows freely through the mesh, so the aggregate is fully surrounded by water when it is weighed and no air is held around it. The basket hangs from the hook below the buoyancy balance.

How does this set differ from the Dunagan Test Set?
This set is built around an 8000 g buoyancy balance and a water tank for coarse aggregate. The Dunagan Test Set uses a 5 kg balance with buckets and two sieves, and also analyses fresh concrete and silt.