The HYDRO EXPANSIVE JOINT has a particular chemical composition which makes it inalterable in time. Even at maximum expansion it is dimensionally stable. After several cycles of hydration and dehydration it retains the ability to increase its volume. The swelling effect of the joint is mechanically very resistant, elastic, in contact with water begins its gradual and controlled expansion, it has been studied in such a way that the fresh cement can attach to it correctly without it undergoing any deformation.
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Tecnologia di posa