Aggregate Chemical Testing

Alkali-Silica Reaction (ASR) of Mortar Bars

Mortar bars are immersed in a strong alkali solution for 2-4 weeks. Length comparitor measurements are taken to determine the effects of ASR.

Alkali-Silica Reaction (ASR) of Mortar Bars Made with SCM

Mortar bars are immersed in a strong alkali solution for 2-4 weeks. Length comparitor measurements are taken to determine the effects of ASR.

Organic Impurity In Fine Aggregate for Use in Concrete

Aggregate is exposed to a sodium hydroxide solution for 24 hours and the resulting discoloration of the solution is given a rating from 0-5. Aggregate with an unsatisfactory rating should be tested for ASTM C87.

Effect of Organic Impurity In Fine Aggregate for Use in Concrete

Any aggregate that has unsatisfactory levels of impurities when tested per ASTM C40 should be tested with this method. Mortar cubes are tested using the test aggregate, as well as the test aggregate after impurities are removed with a sodium hydroxide wash.

Sodium Sulfate or Magnesium Sulfate Soundness Test

Returns the weighted mass loss of an aggregate sample after exposure to 5 cycles of immersion in a salt solution and oven drying.

Water-Soluble Sulfate in Soil

Soil is dried, diluted, and filtered. An aliquot of the sample is then stirred while conditioning reagants and barium chloride is added. A photometer is then used to determine the turbidity of the sample, and the percent of sulfate can be calculated.

Petrographic Examination of Aggregates Intended for Concrete

Performed by an expert in petrography and aggregates. Returns a wide variety of useful information regarding material properties, chemical composition, expected performance, etc.. This procedure focuses on the aggregate’s viability for use in concrete.

Water-Soluble Chloride Content of Aggregates by Soxhlet Extraction Method

Provides the water-soluble chloride content of an aggregate. Chloride is extracted through multiple exposure cycles of boiling water condensation in the Soxhlet Extraction Apparatus.