Shape and soundness test - testing of aggregates, Civil Engineering

Shape and Soundness Test - Testing of aggregates:


For providing a good interlock and strength, the aggregates should be cubical in shape. Elongated and flaky particles lower the strength. Each aggregate particle is passed through standard gauges for determining whether it is flaky or elongated. The combined flakiness and elongation index (i.e. per cent of aggregates which are flaky and elongated) should not be more than 30.


Aggregates for use in bituminous construction should have an affinity to bitumen. The bitumen film should bind firmly on to the aggregate surface and these should be no stripping in the presence of water. The maximum stripping value allowed is 25 per cent.

Soundness Test

Under adverse weather conditions, such as alternate wetting and drying or freezing and thawing, aggregates can disintegrate. In the Soundness Test, aggregate are subjected to alternate wetting in a saturated solution of either calcium sulphate or magnesium sulphate. The loss in weight should not exceed 12 per cent (with sodium sulphate) and 18 per cent (with magnesium sulphate).

Posted Date: 1/22/2013 3:01:12 AM | Location : United States

Related Discussions:- Shape and soundness test - testing of aggregates, Assignment Help, Ask Question on Shape and soundness test - testing of aggregates, Get Answer, Expert's Help, Shape and soundness test - testing of aggregates Discussions

Write discussion on Shape and soundness test - testing of aggregates
Your posts are moderated
Related Questions
Q. Number of segments for segmental linings in tunnelling? For the construction of tunnels by segmental linings, choice of the number of segments affects the durability and cos

how to compute the compound elements particularly outstanding element of compression flange if 2-ismb300 are placed side by side

Q. What is Admixtures? These are the substance which are added to the concrete to improve its qualities either its placing or in its subsequent performance. An admixture may be

Question 1: A stationary 40 kN single axle load (applied on a circular contact area of radius = 152 mm = 6") is applied to each of the flexible pavement structures indicated below

what are the 2 principle factors affecting the allowable bearing pressure in the design of a specific footing

Question During piling works, normally founding levels of bored piles are definite by using total core recovery or rock quality designation (RQD). Are there any problems by

uses of timber in civil engineering field and its physical state and chemical formula or symbol?

The wet weight of a sample is missing in a Proctor test. The oven-dry weight of this sample is 189 N. The volume of the mould used is 1000 cm 3 . If the degree of saturation of