新型抗冻防冻复合外加剂的研制及对水工混凝土性能的影响

Study on the new type antifreeze compound admixture and the effect to hydraulic concrete performance

通过试验确定出了新型抗冻防冻复合外加剂XKF中的组成及最佳掺量,按照JC 475—2004《混凝土防冻剂》的规定的方法对其进行检验,同时研究了外加剂XKF对水工混凝土抗冻防冻性能的影响。试验表明:外加剂XKF对新拌混凝土含气量的影响不仅与引气组分的掺量有直接关系,还受到减水组分、防冻组分的影响;外加剂XKF的性能优于JC 475—2004规定的性能指标,抗冻防冻水工混凝土经过-20℃的负温转正温的养护后,其抗冻等级达到F300,相对动弹模为89.5%,质量损失为4.2%。

Gave compositions of the new type antifreeze compound admixture XKF and the optimal content, through the experiments. According to the regulation of JC 475-2004 concrete antifreeze methods,XKF admixture was tested.And,the effect of the admixture XKF to antifreeze performance of hydraulic concrete was studied.The results indicated that the air content of fresh concrete was not only has the influence of air entering component of the admixture XKF but also water reducing components,antifreeze component; Admixtures XKF performance is superior to the performance indicators stipulated JC 475--2004;Antifreeze hydraulic concrete reaches the antifreeze level F300, relative dynamic modulus of 89.5%, the mass loss of 4.2%, through the curing of-20 ℃ negative to positive temperature.