The Aggregate Soundness test is intended to study the resistance ofaggregates to weathering action, by conducting accelerated weathering test cycles.The Porous aggregates subjected to freezing and thawing are likely to disintegrateprematurely. To ascertain the durability of such aggregates, they are subjected tocycles of alternate wetting in a saturated solution of either sodium sulphate ormagnesium sulphate for 16 - 18 hours and then dried in oven at to a constant weight.After five cycles, the loss in weight of aggregates is determined by sieving out allundersized particles and weighing.
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<element name="AggregateSoundnessTest" type="diggs:AggregateSoundnessTestType" abstract="false" substitutionGroup="diggs:AbstractLaboratoryTestProcedure"><annotation><documentation>The Aggregate Soundness test is intended to study the resistance of aggregates to weathering action, by conducting accelerated weathering test cycles. The Porous aggregates subjected to freezing and thawing are likely to disintegrate prematurely. To ascertain the durability of such aggregates, they are subjected to cycles of alternate wetting in a saturated solution of either sodium sulphate or magnesium sulphate for 16 - 18 hours and then dried in oven at to a constant weight. After five cycles, the loss in weight of aggregates is determined by sieving out all undersized particles and weighing.</documentation></annotation></element>