赵 娟，姜 蓉，李 倍
赵 娟，姜 蓉，李 倍
Abstract: The research relied on the a buliding Dali-Ruili railway in Yunnan province. The abundant natural volcanic ash resource along the railway line was been utilized as mineral admixture into concrete binder, and its application practicability for the subgrade consolidation and protective engineering was discussed. Adopting the basic mechanics property test and dielectric flux test and the sulphate immersion test, correlative discipline between the compressive strength, the resistance to chemical attacking of the volcanic ash concrete and the mixing ratio, age of the volcanic ash concrete were expounded. The research show that the mechanical property and resistance to chemical attack of natural volcanic ash concrete are well, and they grow up with the decreasing level of water binder ratio. Passed electric charge of concrete with only natural volcanic ash reduces to lower than the reference concrete, but it isn’t up to the standard of the railway concrete durability requirement for resistance to chemical attacking. Therefore, double mixing with silica fume is proposed to improve the resistance capability to chemical attack of concrete, which could satisfy the requirement of the railway concrete engineering construction.