Abstract
Abstract Core sampling for testing is considered a reliable method to provide information on structural materials and is one of the most implemented techniques in the evaluation of concrete elements. However, core drilling results in a decrease in cross section that can compromise structural mechanical strength even if the extracted section is repaired. Norm NBR 7680-1 recommends dry pack as a repair method but also allows the use of other techniques as long as its effectiveness is proven. This work evaluated the resistance of repaired structural prototypes after core drilling sampling. Concrete blocks with 20 MPa resistance were produced from which cores of 100 mm, 75 mm and 50 mm in diameter were extracted. The blocks were repaired with 20 MPa concrete, grout and dry pack techniques. The reconstitution with concrete showed poorest performance, while dry pack led to strengths even higher when compared to reference values.
Highlights
On-site evaluation methods are used to evaluate the compression resistance of reinforced concrete
Structural grout or pourable concrete is recommended for holes drilled vertically, as in slabs
The second method utilized industrial-grade structural grout made from Portland cement, quartz sand and special additives
Summary
On-site evaluation methods are used to evaluate the compression resistance of reinforced concrete. This is necessary due to uncertainties in the properties of concrete or to better assess the loading capacity of the structural element [1]–[3]. Core extraction is considered the most reliable since it replicates closely the real properties of the material [4]–[7].
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