Nowadays, concrete industry uses viscosity-modifying admixtures (VMA) for the production and placement of special construction applications such as underwater or self-consolidating concrete. VMAs can decrease the movement of water and fines, and maintain the underwater concrete's homogeneity. Self-consolidating concrete requires high stability since the material shows a high slump-flow, but high viscosity is also required to avoid aggregate segregation. Currently, the use of both superplasticizer admixtures (SP) and VMAs is very common, as they improve the stability of special cement-based materials. The combined influence of a biopolymer admixture (BVMA) and a commercial SP under different dispersion conditions on the rheological properties of cement pastes was analyzed. Results showed a delayed hydration of cement compounds when incorporating both SP and BVMA into the mixture; however, SP contents controlled the hydration rate, the setting times, and the specific heat. Although mechanical strength tests showed that an increase in SP dosages caused a decrease in this parameter, higher compressive-strength values were achieved with BVMA incorporation. Results also showed that BVMA increased cement pastes' viscosity; however, this effect is adequately compensated by the dispersion properties of the SP employed. The rheological parameters of the cement pastes analyzed were obtained by using the Herschel-Bulkley's model. Hence, it was concluded that the BVMA used in this study has a very interesting potential to be used as a viscosity modifier when it is properly dispersed using superplasticizers.

如今，混凝土行业使用粘度调节外加剂 (VMA) 来生产和铺设特殊建筑应用，例如水下或自密实混凝土。VMA 可以减少水和细粒的运动，并保持水下混凝土的均匀性。自密实混凝土需要高稳定性，因为材料表现出高坍落度，但也需要高粘度以避免骨料离析。目前，超塑化剂外加剂 (SP) 和 VMA 的使用非常普遍，因为它们可以提高特殊水泥基材料的稳定性。分析了生物聚合物外加剂 (BVMA) 和商业 SP 在不同分散条件下对水泥浆流变性能的综合影响。结果表明，在混合物中加入 SP 和 BVMA 时，水泥化合物的水化延迟；然而，SP 含量控制了水化速率、凝固时间和比热。尽管机械强度测试表明 SP 剂量的增加导致该参数的降低，但 BVMA 掺入实现了更高的抗压强度值。结果还表明，BVMA 增加了水泥浆体的粘度；然而，这种影响被所采用的 SP 的色散特性充分补偿。所分析的水泥浆体的流变参数是通过使用 Herschel-Bulkley 模型获得的。因此，得出的结论是，当使用超塑化剂适当分散时，本研究中使用的 BVMA 具有用作粘度调节剂的非常有趣的潜力。