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Pullout testing is the only reliable and repeatable method for on-site determination of the compressive strength of concrete. Unlike the poor correlations derived from methods like ultrasound or the rebound hammer, the LOK-TEST readings are converted directly into compressive strength.

Advantage of the LOK-TEST

Numerous major correlations taken over the past 20 years have consistently shown that the stability of the LOK-Test correlation is unaffected by variations in types of cement, w/c-ratio, age, curing conditions, air entrainment, admixtures, flyash, and shape/type and size of aggregates up to maximum of 40 mm. Only the use of lightweight aggregates has produced a significantly different correlation.

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