| http://www.w3.org/ns/prov#value | - The metal can start to corrode inside the cement, leading to the cracking of the grouting material and the generation of flammable hydrogen gas, allowing water to penetrate the block of grout. ???It???s particularly problematic when the metal has sharp edges or is in the form of fines or swarf from machining,??? he added.Wastes from the Windscale PIle 1 fire, often shap-edged and metallic, could b
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