Encontrei composite para colaborante. logo deduzi q possa ser composite concrete.

An ultra-high performance composite concrete, with low cement and fiber content and having good mechanical properties as well as good impacts, ...
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Composite Concrete Manufacturing Process. While most people can recognize concrete when they see it, so few people really know what this amazingly flexible ...
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The amount of fibres added to a concrete mix is expressed as a percentage of the total volume of the composite (concrete and fibres), termed volume fraction ...
www.en.wikipedia.org/wiki/Fiber_reinforced_concrete