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Question:
George Nicula: "It turns out that I am the only licensed paver I know of. That's
because the statute is not fully enforced, but it is my understanding that
changes are imminenet, but what is molecular bonding for concrete?"
Answer:
Tech101: .George Nicula, In regards to your question, "What is molecular
bonding?" A structural fiber conducive to achieving a molecular bond is one
that is less stretchy than the concrete it is reinforcing. This is measured by the
Modulus of Elasticity. To be considered structural, generally you must have a
ME greater than 25. There are sophisticated measures, like the ability to
strain-harden, that can be considered, but the ME is a good basic parameter
for separating the stiff fibers from the stretchy ones.
Steel fibers have greater tensile strength than PVA fibers, but this strength is
rarely used. Steel fibers, like rebar, are passive reinforcement, meaning they
have no reinforcing effect until the concrete cracks. The problem then is that
steel fibers tend to pull out rather than hold the concrete together. Many
techniques have been used to increase the mechanical bond of steel
fibers--hooks and waffles are among the most popular--but even so the steel
fibers pull out easily. Contrast this with PVA fibers which create a molecular
bond with the cement during hydration. When you try to pull a PVA fiber out, it
holds on firmly, taking full advantage of PVA's tensile strength......good luck!
Question answered in: 0 hours 11 minutes
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