| 摘要 |
<p>A finely dispersed polyisocyanate in the form of an emulsion in water or by spraying is mixed with a Portland cement mortar or concrete during the working, the quantity of emulsion or of dispersion employed being chosen to add a weight of polyisocyanate of between 0.5 and 5% of the weight of cement, and the mixture is used. An endogenic carbonation of the concrete is thus ensured, and this reduces the sensitivity to efflorescence phenomena, increases short-term mechanical strength and stabilises shrinkage. The carbonated concrete offers better resistance to attacking agents and the process also makes it possible to localise the carbonation perfectly and, for example, to improve the durability of glass fibres incorporated in a cement-based matrix.</p> |
