Material Testing

Compressive Strength

COMPRESSIVE STRENGTH

C3S performs compressive strength tests utilizing the procedure set forth by ASTM C42 – Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete. This test is performed to determine if the concrete meets the required compressive strength specified in the construction documents.

Concrete Coring Photo

Coring of concrete slab.

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Lab testing of field prepared concrete cylinder.

We also perform compressive strength test on concrete samples casted on site and cured in a lab per ASTM C39.

Los Angeles Abrasion Test For Aggregates

LOS ANGELES ABRASION TEST FOR AGGREGATES

C3S performs this test utilizing the procedure set forth by ASTM C 131 – Test Method for Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine.

This method is used as an indicator of the relative quality or competence of a source of aggregate. Particularly, it is effective in identifying aggregates with inherent cracks in them and the likelihood of sections of the aggregate breaking off/chipping off and entrapping large cavities in the concrete. Perennial problems of concrete pavement using weathered river gravel is prevalent in our area of southeast Houston.

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LA Abrasion Testing Equipment

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Photos show chipped off sections of inferior aggregate creating large voids (blue areas) in concrete, thereby making the concrete weak. This test detects these types of aggregates.

Organic Impurities In Sand

ORGANIC IMPURITIES IN SAND

We perform this test utilizing the procedure set forth by ASTM C 40 – Test Method for Organic Impurities in Fine Aggregates for Concrete.

This test determines the presence of deleterious organic impurities in fine aggregates that have the potential of impairing the durability of the hardened concrete. Specifically, it is used in ensuring that the effectiveness of air entraining agent used to resist freeze-thaw action in cold climates is not compromised.

Picture Organic Impurities In Sand

Test kit

Permeability Of Concrete

PERMEABILITY OF CONCRETE

C3S performs Permeability of Concrete tests utilizing the procedure set forth by ASTM C 1202 – Test Method for Electrical Indication of Concrete’s Ability to Resist Chloride Ion Penetration.

This test method is also often resorted to in evaluation of infrastructure. Data generated from the test, by way of coulombs of electrical charge passing through a specified sample size, can be used to determine the propensity the section of the structure will readily permit fluids containing deleterious materials to gain access into the structure.

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                    Rating of concrete permeability

Soluble Chloride Content

SOLUBLE CHOLRIDE CONTENT

C3S performs this test utilizing the procedure set forth by ASTM C 1152 – Test Method for Acid-Soluble Chloride in Mortar and Concrete.

This test is used routinely in investigating potential for corrosion of embedded rebars in concrete structures. Especially in repair and rehabilitation of infrastructure where a portion of the structure is in sea/a body of water or pavements that have been subjected to salt application for ice removal. This method is often resorted to in assisting to determine the point within concrete where the critical chloride content to cause corrosion of rebar occur. Samples of concrete taken with a rotary impact drill at successive one-half inch depths are taken to the level of the rebar. The chloride content is separately determined for each depth and a graph developed to give the chloride ion profile in the structure.

Writeup Pictures Soluble Chloride Content

Experience Matters

  • We go beyond the traditional materials testing to determine condition of concrete and related construction materials.