矿物掺合料和CLDH对水泥基材料氯离子固化性能研究

A study on curing charateristics of chloride ions binding in cement based materials with mineral admixture and CLDH

采用等温吸附平衡方法,研究了单掺和复掺粉煤灰、矿渣和焙烧层状双金属氢氧化物(CLDH)对水泥基材料氯离子固化性能的影响,并借助XRD对影响机理进行分析结果表明:单掺范围为15%~45%情况下,随着粉煤灰和矿粉掺量增加,水泥基固化氯离子的量先增大后减小,当粉煤灰和矿粉的掺量在30%时,其固化氯离子的能力较好且都优于纯水泥对氯离子的固化效果;水泥基材料氯离子固化量随着CLDH掺量的增加而增加;但是粉煤灰和矿渣依次与CLDH复掺,复掺效果不佳,其复掺效果不如单掺粉煤灰或矿渣对氯离子的固化效果好研究成果对以后复掺技术在海工混凝土中的有效、合理使用提供相应的参考.

In this paper,The effects of single admixture and remixed fly ash,slag and calcined double metal hydride (CLDH) on the properties of chloride ion curing of cement based materials were researched after 28 days by use of equilibrium experiment.Then,the effect mechanism was analyzed by XRD,and the results shown that,with the addition of fly ash and mineral powder,the amount of the solidified chloride ions increased first and then decreased with the addition of fly ash and mineral powder.When the fly ash and mineral powder were added to 30%,the solidification of chloride ions was better and better than that of pure cement for the curing effect of chlorine ions.The chloride ion solidification volume of cement based materials increased with the increase of CLDH content.But the fly ash and slag are mixed with CLDH in turn,and the mixed results are not very good,and the effect of the compound effect is not as good as the curing effect of a single fly ash or slag on chloride ions.The research results provide relevant reference for the effective and rational use of the recombination technology in marine concrete.