Concrete

Concrete is inspected and tested to ascertain that all specified conditions meet the acceptable criteria specified. This is achieved by visual, mechanical, nondestructive, or destructive methods. Tests are performed in accordance with the American Concrete Institute (ACI), American Society for Testing and Materials (ASTM) and American Association of State and Transportation Officials (AASHTO) testing and inspection procedures.

    Mix Designs – MTI can provide mix designs and mix design reviews in its fully equipped and certified laboratories.

    On-Site Concrete Testing and Inspection - Inspection of the placement of concrete and testing the fresh properties of concrete to verify conformance to the project plans and specifications. Concrete tests include slump, air content, temperature, yield, unit weight, water-cement ratio, in addition to the casting of concrete cylinders/beams for compressive/flexural strength.

    Reinforcing Steel Placement - Placement of reinforcing steel is verified for size, quantity, spacing and clearance in the concrete forms prior to the placement of concrete. A comprehensive inspection of the forms and subgrade conditions is also performed.

    Compressive Strength Testing - Laboratory testing of concrete specimens is performed to determine the compressive strength of the concrete.

    Pre-stressed & Post-tensioned Concrete - Inspection is performed during installation of unbonded tendons, couplers, anchorage and concrete placement. Calibration of stressing jacks, gauges and elongation measurements are verified to be in accordance with plans and specifications.

    Pre-cast Concrete Fabrication - Inspection of precast facilities is performed to verify quality control procedures are being adhered to and construction methods/techniques are in accordance with project requirements.

    Batch Plant Inspection and Quality Control - Monitoring of concrete at the plant is performed to control key properties; including air content, water/cement ratio, slump, etc.

After Placement Testing of Concrete

        Pachometer Testing - Pachometer testing is used to locate existing reinforcing steel in concrete structures. This equipment can determine the concrete cover, rebar sizes, spacing, and length.

        Windsor Probe Testing - Windsor Probe (ASTM C 803) testing methods can be used for assessing the general quality, uniformity, and relative strength of concrete members.

        Schmidt Hammer Testing - Schmidt Hammer testing is used for the non-destructive measurement of the concrete/mortar compressive strength and the control of the uniform concrete quality (in-situ concrete and prefabricated structures) as well as for detecting weak spots.

        Petrographic Analysis - Using varied microscopic equipment and expertise, MTI is able to perform a multitude of unique analysis methods including petrographic analysis of rock and aggregate and porosity of hardened concrete, mortar, and grout. A number of properties can be determined; including air content, aggregate percentages, water/cement ratio, etc.