If too much rubber is present, the friction of the landing strip will be less, requiring more distance for landings, especially in wet weather.
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Hand lance operators wear steel-toed boots, metatarsals, shin guards and sometimes body armor.
Hydrodemolition, the use of high pressure water to remove concrete
Ultra high pressure water jet cutters are used to cut a wide variety of materials including granite, concrete (see hydrodemolition), ceramics, fabric and even Kevlar.