聚氨酯改性混凝土材料探讨

It has been proved that the mortar added with polyurethane can acquire better durability when comparing with the normal mortar which has the same water to cement ratio. In this paper, polyurethane was put into concrete as concrete modified material, but pilot study showed that polyurethane could increase the loss of slump. Finally this problem was solved by adding polycarboxylate superplasticizer into the concrete. And also, this paper used compressive strength as an important parameter to decide the optimal curing condition and optimal sequence of materials-adding. Furthermore, because of the excellent emulsification of foam stabilizer to polyurethane and the sequent ability of forming tinier air bubble and limited pore size distribution as well as higher close porosity, the foam stabilizer can be used in polyurethane concrete to improve the durability. In this paper, two kinds of foam stabilizer from different manufacturers are put into experiment, and according to its compressive strength effect the better one is selected and then applied to polyurethane modified concrete.