When he travels, david rosenberg likes to take along chunks of concrete and an eyedropper full of water. He demonstrates to anyone who's interested how water from the dropper seeps into one piece of concrete but rolls off the surface of the other. The difference, he says, is the product made by Hycrete, the Carlstadt, N. J. company he founded. Hycrete sells an additive that makes concrete both waterproof and more environmentally friendly. The product eliminates the need for a petroleum-based membrane that encases concrete placed below the ground. The construction industry is typically averse to trying new products, but Hycrete has some nice selling points: reduced material costs and construction time, a patina of greenness and a prediction that it will keep rebars from rusting.
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