正交法在冻结井壁砼复合外加剂试验中的应用

Application of Orthogonal Experiment in Compound Admixture of Freezing Mine Shaft Lining Concrete

为了使冻结施工井壁混凝土能够在负温条件下凝结与硬化,并满足其各项性能要求,采用引气剂+防冻剂+早强减水剂复合的技术路线,通过正交试验设计复配了适应冻结施工早强流态井壁混凝土的复合外加剂。通过试验分析最终确定各组分掺量之间的最佳配比。复合外加剂的掺量为2.1%,可起到流态、早强、防冻及抗冻的作用。

In order to achieve the setting and hardening of mine shaft lining concrete under the minus tempera- ture in freezing construction and to meet the demands of every performance of concrete, the technique of com- pounding air entraining admixture and antifreezing admixture and early strength water reducing admixture was ap- plied in this research. Based on the Orthogonal experimental design, several mix proportions of compound admix- ture for early strength liquid mine shaft lining concrete were developed in the laboratory. The data collected in this research provide reference for the optimum mix proportion of the adulteration quantity of the concrete admix- ture. The results show that the 2. 1% amount of compound antifreezing admixture achieves favorable effects of liquid, early strength, freezing prevention and antifreezing.