Effect of polycarboxylate polymer powder on the adaptability of cement at different temperatures

The compatibility between polycarboxylate polymer powder and cement is not good, and the concrete mixture is prone to problems such as segregation, bleeding, increased slump loss, and shortened setting time. This makes the concrete mixture unable to be transported and poured normally, reducing the strength of the concrete. and durability.

Low-heat cement is increasingly used in hydraulic concrete because of its low heat of hydration and large strength growth rate in the later period. However, there are few studies on the compatibility of low-heat cement and polycarboxylate polymer powder.

When the cement temperature reaches above 60°C, a small amount of bleeding occurs in the concrete mixture; when the cement temperature reaches 100°C, the aggregate and slurry separate, and the cohesion of the concrete mixture becomes worse. The reason for this negative impact is that the cement The high temperature makes the temperature of the concrete mixture rise faster in a short period of time, which makes it easier to stimulate the water-reducing function of polycarboxylate polymer powder

At higher temperatures, more free water wrapped in the mixture particles is released, making the There is a small amount of bleeding in the concrete at the outlet.