Tests Of Bonding Of Floor Finish To Slabs Of Haydite And Gravel Concrete
F. E. Richart and V. P. Jensen
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The use of reinforced Haydite concrete for floor slabs has naturally raised the question as to the ability of a finish course of mortar or terrazzo to bond to the slab. Some difficulties have been anticipated by designers due to the tndency for coarse Haydite particles to rise to the surface of the base course and due to the differences in elastic behavior of the topping and base concretes in which the first has a high modulus of elasticity and the second a low one. Questions of this sort have usually been answered through experience with a floor in service and this is without doubt the most satisfactory and convincing answer. The writers know of no laboratory tests that have been made on the bonding of floor finish; such tests could hadly be expected to include differential shrinkages of the two courses over large floor areas, or the effect of hard service, such as heavy trucking, impact, abrasion,or vibration. However, in an attempt to devise a test that would show whether there were obvious defects in the bonding, and show them within a short time, the following simple tests were made.