This study investigated the effect of wet carbonated recycled cement paste powder (RCPP) on the rheological properties of cement pastes. The results showed that wet carbonated RCPP decreased the cement paste's setting time and flowability, increased its yield stress and plastic viscosity, and changed its thixotropy. The high absorption capacity of the silica gel in the carbonated RCPP was the most dominant factor influencing the rheological properties of the paste. The absorption capacity of silica gel was dependent on its pore structure, specific surface area, and the amount of hydroxyl groups on its surface. These properties varied with the carbonation method, time, temperature, and CO flow rate. The use of monoethanolamine as the aqueous solution for wet carbonation was found to be an effective approach to mitigate the adverse effect of carbonated RCPP on the rheological properties of cement paste.

中文翻译：

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湿法碳酸再生水泥净浆粉对水泥净浆流变性能的影响


本研究研究了湿碳酸再生水泥浆粉（RCPP）对水泥浆流变性能的影响。结果表明，湿法碳酸RCPP降低了水泥净浆的凝结时间和流动性，增加了其屈服应力和塑性粘度，并改变了其触变性。碳酸RCPP中硅胶的高吸收能力是影响浆体流变性能的最主要因素。硅胶的吸附能力取决于其孔结构、比表面积和表面羟基的数量。这些特性随碳酸化方法、时间、温度和 CO 流量的变化而变化。研究发现，使用单乙醇胺作为湿式碳酸化的水溶液是减轻碳酸化RCPP对水泥净浆流变性能不利影响的有效方法。