WaveCel T2+ Max Hard Hat
This is an ANSI-rated Type II hard hat, which means that it is designed to offer protection from lateral blows and objects hitting the head from the front, back, and sides, as well as the top (Type 1 hard hats protect only from blows to the top of the head). It has an adjustable fit and accessory rails for options such as a four-point chin strap, a head lamp, earmuffs, and a face shield. I also liked that it is made in the U.S.
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https://www.jlconline.com/tools/safety-workwear/wavecel-t2-max-hard-hat_o
Is Rusty Rebar a Problem?
Q. Since steel expands when it rusts and destroys whatever is around it, why doesn’t the rebar used to reinforce concrete footings and foundations—which are in contact with ground water—rust and break the concrete into pieces?
A. Foster Lyons, an engineer and building-science consultant, responds: The short answer is, it does, but it happens so slowly and takes so long that it is insignificant to us. Properly placed rebar typically corrodes at a rate of about 1/10 micrometer per year across the thickness of the material. So, under normal conditions, a #5 bar (5/8-inch diameter) loses 2/10 micrometer from its diameter every year.
To determine if this is a problem, we have to understand the size of a micrometer. Also known as a micron and symbolized by the Greek letter µ, a micrometer is equal to one millionth (1/1,000,000) of a meter. By way of comparison, fine, thin hair is about 30µ in diameter and thick hair, about 130µ. A razor blade is about 0.4µ at its cutting edge, while a sharp knife blade is about 1µ; 5µ at the cutting edge is considered dull.
https://www.jlconline.com/how-to/foundations/is-rusty-rebar-a-problem_o
Concrete wedge anchors’ design allows them to anchor fixtures into concrete. Concrete wedge anchors work by inserting them into a hole drilled into concrete. The concrete wedge anchor is then expanded, wedging itself securely in the concrete. The length ID code and identifying marking are stamped on the head of every anchor. The ANSI drill bit size for these anchors is equivalent to the diameter of the anchors themselves.
How to Ensure Waterproof Concrete Foundations
Asking the right questions in a pre-construction meeting can lead to a quality placement.
Pre-construction meeting discussion items
Our experts proposed these checklist topics contractors should address with the general contractor and design professional in the discussions leading up to the placement.
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Are you the shark?
