An aggregate soundness test procedure, which studies the resistance of aggregates toweathering by accelerated weathering cycles. Porous aggregates subjected to freezingand thawing are likely to disintegrate prematurely, so the aggregate is subjected tocycles of alternate wetting in a saturated solution of sodium sulphate or magnesiumsulphate for 16 to 18 hours and drying in an oven to constant weight. After fivecycles the loss in weight is determined by sieving out all undersized particles andweighing.
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<element name="AggregateSoundnessTest" type="diggs:AggregateSoundnessTestType" abstract="false" substitutionGroup="diggs:AbstractLaboratoryTestProcedure"><annotation><documentation>An aggregate soundness test procedure, which studies the resistance of aggregates to weathering by accelerated weathering cycles. Porous aggregates subjected to freezing and thawing are likely to disintegrate prematurely, so the aggregate is subjected to cycles of alternate wetting in a saturated solution of sodium sulphate or magnesium sulphate for 16 to 18 hours and drying in an oven to constant weight. After five cycles the loss in weight is determined by sieving out all undersized particles and weighing.</documentation></annotation></element>