紫外线对粉煤灰混凝土碳化的影响研究

Research on Influence of Ultraviolet Radiation on Carbonation of Fly Ash Concrete

为研究紫外线对混凝土碳化的影响,对不同紫外线照射条件下的不同掺量粉煤灰混凝土进行了快速碳化试验。结果表明,紫外线对混凝土的碳化有明显促进作用,紫外线照射下混凝土碳化深度增加明显,随着紫外线强度的增加碳化深度随之增加;无紫外线照射条件下粉煤灰混凝土碳化深度随粉煤灰掺量的增加而增大,在紫外线照射条件下粉煤灰混凝土的碳化深度随粉煤灰掺量的增大呈现先减小后增大的趋势,即掺入粉煤灰后紫外线照射对混凝土碳化的促进作用被削弱;紫外线强度、粉煤灰掺量及其交互作用对碳化深度均有显著影响。研究结果为紫外线照射条件下混凝土的粉煤灰掺量设计、保护层厚度设计及混凝土耐久性预测等问题提供了新思路。

In order to study the impact of ultraviolet radiation on the carbonation of concrete, the rapid carbonation tests of fly ash concrete with different dosages under different ultraviolet radiation conditions were carried out. The results show that ultraviolet radiation can significantly promote the carbonation of concrete, the carbonation depth of ordinary concrete increases obviously under ultraviolet radiation, and increases with the increase of ultraviolet radiation intensity. Under no ultraviolet radiation, the carbonation depth of fly ash concrete increases with the increase of fly ash content;Under ultraviolet irradiation, the carbonation depth of fly ash concrete decreases first and then increases with the increase of fly ash content, indicating that the promotion of ultraviolet radiation on concrete carbonation is weakened after the addition of fly ash;Ultraviolet intensity, fly ash content and their interaction have obvious impact on the carbonation depth. The research results provide new ideas for the design of fly ash content, thickness of protective layer and durability prediction of concrete under ultraviolet radiation.