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Tensile strength of concrete.
Interesting to watch a skilled bricklayer use a " certain" type trowel to
remove very old mortar from a used brick.
notice very carefully that he strikes the brick near the old mortar and "
shazzaam!!" the mortar instantly releases from the brick.
Once had an old timer say he had a certain trowel that " sang" when he
struck the brick a certain way so he could feel the brick resonate in his
hand.and the morter would release.
Richard
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