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Concrete Burns • Sand contained in fresh concrete is abrasive to bare skin • Portland is an alkaline. Strong bases (ph of 12-13) are just as hazardous as strong acids to the skin but have no initial signs of pain such as a burning sensation. • Drying Portland is hygroscopic – it …
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2005 • Minneapolis MN • At approximately 7:00 a.m. on September 6, 2005, Employee #1 entered the work area on the fifth floor of the project. • Employee #1 was walking through tunnel forms to prepare the forms for a concrete pour.
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Concrete must be mixed with the ratio of 5 parts cement, 3 parts gravel and 4 parts water. If 6 tons of concrete is to be mixed how much gravel is required? a) 2.4 tons b) 2.5 tons c) 1.5 tons d) 2 tons e) 1,865 tons. C. Public swimming pools require 3 parts chlorine liquid and 2
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10/04/2016 [-] 2 Vermont teachers accused of drawing on new concrete. 10/03/2016 [-] Cement gets its close-up Team explores cement's crystalline nature to boost concrete performance. 09/28/2016 [-] Tough microbe settlers in the concrete jungle. 09/27/2016 [-] Couple says chunk of concrete from M-6 hit car.
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Artwork: How reinforced concrete fails: (1) Alkalis from the cement react with silicas in the aggregates, forming larger crystals that crack the concrete apart from the inside, (2). Water flows in down the cracks (3), rusting the rebar (4), which can break apart and cause more cracking or …
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