Construction Materials Testing

Fall Line performs laboratory tests on aggregates, soils, concrete, and Roller Compacted Concrete (RCC) to confirm the characteristics of these items in conformance to project specifications. The Fall Line staff routinely participates in full scale test sections and project construction. We perform a myriad of tests as outlined in American Society for Testing and Materials (ASTM) procedures and unique project specifications. Specific test programs and methods include:

 

Accelerated Curing Test Program - This test method projects the future strength of concrete and RCC by exposing the specimens to an environment that allows them to cure at a much higher rate than normal. The accelerated program enables us to project up to 180 day strength in only a couple of weeks.

Aggregate Gradations - This test method is used to determine the grading of aggregates for compliance with specified requirements. It is used to provide necessary data for control of the production of various aggregate products.

Alkali Reactivity - This test method is used to determine the potentially harmful alkali-silica reactivity with consequent deleterious expansion of concrete in a cement aggregate combination.

Compressive Strength Testing - This test method consists of applying a compressive axial load to a molded concrete or RCC cylinder or core until failure occurs. The results are used as a basis for quality control of proportioning, mixing, and placing operations.

Length Change - This test method is used to assess the potential for volumetric expansion or contraction of mortar or concrete due to causes other than applied force of temperature change. This test method is useful for comparative evaluation in different mixtures of concrete or mortar.

Modulus of Elasticity - This test method provides a stress to strain ratio value and a ration of lateral to longitudinal strain for hardened concrete and RCC.

Moisture Content Testing - This test method is used to determine the precise moisture content of aggregate, concrete, and RCC.

Plant Uniformity Testing - The Fall Line staff obtains samples of produced material from the plant during uniformity testing at various stages to determine compliance with project specifications in regard to plant uniformity.

Tensile Strength - This test method consists of applying a diametral compressive force along the length of a cylindrical concrete or RCC specimen. Tensile failure occurs rather than compressive failure because the areas of load application are in a state of triaxial compression.

Thermal Testing - Thermal behavior of dams and other mass concrete structures is always a concern.  Fall Line is equipped to perform a full suite of thermal analysis tests, including; adiabatic temperature rise, coefficient of thermal expansion, thermal diffusivity, and specific heat.  Our state of the art equipment and methods have be evaluated and proven under the strict requirements of the nuclear industry.

Unit Weight, Air Content and Density Testing This test method is used for determining the density of freshly mixed concrete. It is also used for determining the yield, cement content, and air content of concrete.

 

VEBE Testing - This test method is used for determining the consistency of an extremely dry concrete mixture that is commonly used in RCC. Because of the stiffness of the concrete mix, this test is generally used in place of a slump test.