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Anchor bolt tensile and shear test

The Pull Out Test is one of the methods used to inspect an anchor’s load carrying capacity. This test determines the tensile strength capacity. The tested load will be applied in the parallel direction to the anchor using a hydraulic pump with a load measuring system. Displacement of the tested anchor is measured by a displacement transducer which shows real-time data. The Pull Out Test conducted by RE complies with the ASTM E488-10 standard.

Furthermore, RE also offers the Shearing Test which is another test used to determine an anchor’s load carrying capacity. This test specifically determines the shear capacity of the tested anchor. The tested load will be applied in the perpendicular direction to the anchor using a hydraulic pump with a load measuring system. A displacement transducer is also installed to measure displacement.

Both the Pull Out Test and the Shearing Test are the most effective methods to verify that the anchor system can withstand the designed load capacity.

The settlement survey is used to inspect structures that show structural settlement using a total station (TS) to inspect both vertical structures  and horizontal structures. The settlement survey can be used to determine the slope of the settlement and whether such damage will affect the structure.

Sloping behavior of the structure allows us to assess more accurately the causes of damage. Some common causes found are uneven pile settlement and structural expansion.

The settlement survey is a short-term inspection. However, if the need arises for a more long-term inspection of the settlement, settlement monitoring techniques will be used by which equipment will be installed to collect data over a period of time with our team visiting the site at regular intervals.

Schmidt Hammer/Rebound Hammer

Rebound Hammer Test

The Rebound Hammer Test is a non-destructive test of compressive strength of concrete conducted following the ASTM C805 standard.

The compressive strength of concrete is a crucial value in structural assessment as it is the main variable that can affect the load carrying capacity of reinforced concrete structures.

The mechanism inside the rebound hammer is the spring-loaded mass which will be triggered when the plunger is pressed against the concrete. The impact energy from the spring-loaded mass will be transferred into the plunger to the concrete surface, and the reflection of impact energy (rebound) will be indicated by a “rebound number” shown at the scale on the side of the hammer unit. The interpretation of concrete compressive strength is conducted by using the relationship of the rebound number and the compressive strength.The higher rebound number (higher reflection of impact energy) implies the higher compressive strength of concrete.

The test will not leave any damage on the surface of structural concrete, and it can be done quickly and at a low cost suitable for large testing areas.

The Rebound Hammer Test can also be conducted in conjunction with the Compressive Strength Test for the Cored Samples for more accurate test data.

Concrete pull-off test

The Concrete Pull-Off Test is used to determine the direct tensile strength of a concrete or the bond strength of concrete mixture. The testing equipment consists of metal test circular plates, threaded rods, epoxy, a core drill, a load cell, a displacement transducer, and a hydraulic jack.