Abstract

Admixtures such as viscosity modifying agents and mineral admixtures could be used to regulate the rheological behaviour of the self-compacting concrete mixture. Herein, cellulose nanofibres obtained from Cladophora sp., a bio-waste that pollutes water bodies and threatens the ecosystem, were used to provide appropriate plastic viscosity in self-compacting mortars instead of a traditional viscosity modifying agent known as Welan gum (WG). Within the scope of the study, mini-slump, mini-V funnel, viscosity tests, compressive-flexural strength tests and FE-SEM analyses were performed on the mortar and cement paste specimens prepared. According to the rheological results, increases of up to 93% in plastic viscosity and increases of up to 10 times in yield stress were observed in the CCF-used specimens. On the other hand, increases in yield stress up to seven times and in plastic viscosity up to 37% were determined in the specimens with WG added. Moreover, as a result of mechanical tests, increases of up to 15% in compressive strength and up to 7% increases in flexural strength were observed in the WG-added specimens. While the decreases of up to 4% in compressive strength were observed, increases of up to 12% in flexural strength were detected in the CCF-added specimens.

摘要

粘度调节剂和矿物外加剂等外加剂可用于调节自密实混凝土混合物的流变行为。在此，从刚毛藻中获得的纤维素纳米纤维sp. 是一种污染水体并威胁生态系统的生物废物，被用来在自密实砂浆中提供适当的塑性粘度，而不是传统的粘度调节剂 Welan 胶 (WG)。在研究范围内，对制备的砂浆和水泥浆体试样进行了小型坍落度、小型 V 型漏斗、粘度测试、抗压抗弯强度测试和 FE-SEM 分析。根据流变学结果，在使用 CCF 的样品中观察到塑性粘度增加高达 93%，屈服应力增加高达 10 倍。另一方面，在添加了 WG 的样品中，屈服应力增加了 7 倍，塑性粘度增加了 37%。此外，作为机械测试的结果，在添加 WG 的样本中观察到抗压强度增加了 15%，弯曲强度增加了 7%。在添加 CCF 的样品中，虽然观察到抗压强度降低了 4%，但抗弯强度增加了 12%。