OCR Text |
Show Concrete Futed. Fusion of concreie has been noticed no-ticed after some (ires in reinforced concrete buildings. The tests by the United States bureau of standards have shown that some small specimens speci-mens of concrete may be fused by a temperature of about J.ll'Kl degrees Fahrenheit, which Is about the melting point of manganese am' considerably below that of nickel of iron, but it is supposed that the fusing temperature tempera-ture varies with the kind of sand and cement used. |