刚玉质自流浇注料流变性和流动性的关系

采用浇注料流变仪、L型流动性测试装置和自流值测定装置,测定了加水量、分散剂(FS10)、纯铝酸钙水泥和α-Al2O3微粉对刚玉质自流浇注料的流变性和流动性的影响,并分析了流变性和流动性之间的关系.实验结果表明:随加水量增加(质量分数4.9%～5.3%),相对屈服应力、相对塑性黏度和相对平均黏度均逐渐减小,自流值和流动速度逐渐增大.随分散剂FS10加入量的增加(质量分数0.16%～0.20%),相对屈服应力、相对塑性黏度和相对平均黏度逐渐减小,自流值和流动速度逐渐增大;分散剂FS10加入量继续增大时(0.20%～0.22%),相对屈服应力、相对塑性黏度和相对平均黏度显著增大,而自流值和流动速度大幅下降.随纯铝酸钙水泥加入量增加(质量分数1%～4%),流变参数和流动参数有一定的变化,但变化不明显.随α-Al2O3微粉加入量的增加(质量分数9%～12%),相对屈服应力和相对平均黏度均减小,相对塑性黏度变化不大,自流值变化不大,流动速度加快.刚玉质自流浇注料流变参数和流动参数之间的关系为:自流值和相对屈服应力有较好的相关性,而流动速度和相对平均黏度有较好的相关性.

Relationship between rheological properties and flowability of a corundum based self-flow castable

With the castable rheometer, L-box flowability test apparatus and self-flow test apparatus, the influence of water addition, dispersant content (FS10), aluminate cement content and α-Al_2O_3 content on the rheology and flowability of a corundum-based self-flow castable were researched, and the relationship between rheological properties and flowability of the castable were analyzed. The results show that with the increase of water addition (4.9% to 5.3%, mass fraction), the relative yield stress, relative plastic viscosity and relative average viscosity decrease, but the self-flow value and flow velocity increase. With the increase of dispersant FS10 (0.16% to 0.20%, mass fraction), the relative yield stress, relative plastic viscosity and relative average viscosity decrease, but the self-flow value and flow velocity increase. With more dispersant FS10 additions (0.20% to 0.22%), the relative yield stress, relative plastic viscosity and relative average viscosity increase markedly, but the self-flow value and self-flow velocity decrease remarkably. With the increase of aluminate cement (1% to 4%, mass fraction), the rheology and flowability parameters have some change, but not obvious. With the increase of α-Al_2O_3 addition (9% to 12%, mass fraction), the relative yield stress and relative average viscosity decrease, the relative plastic viscosity and self-flow value have little change, but the self-flow velocity increase. The relationship between rheology parameters and flowability parameters of the corundum-based self-flow castable is shown as the following: the self flow value and relative yield stress have good relevance;the flow velocity and relative average viscosity have good relevance.