掺粉煤灰泵送混凝土的碳化影响分析

In order to study the influence of the ratio of admixture fly ash on pumping concrete carbonation, produced different water-binder ratio and ratio of admixture fly ash concrete reference block, and reach the age of standard test blocks for carbonization test and scanning electron microscopy (SEM) test. Analyzed the different dosage of fly ash and water-binder ratio of pumped concrete carbonization performance, studies the carbonization reason of the fly ash pumping concrete. The results showed that the dosage of fly ash and water-binder ratio has important influence on fly ash pumping concrete carbonization performance, pumping concrete carbonation depth increases with increasing dosage of fly ash and water cement ratio; Water-binder ratio greater than 0.4, dosage of fly ash more than 10%, fly ash concrete carbonization obvious at early stage; water-binder ratio is less than 0.3, more than 30% dosage of fly ash can effectively inhibit the carbonation depth increased caused by concrete cracking. Among them, Dosage of fly ash effect on the properties of fly ash pumping concrete carbonization is bigger. Scanning electron microscopy (SEM) test show that, with the increase of dosage of fly ash pumping concrete pore structure is obvious, the trend of change big, deep; With the increase of water cement ratio, surface of concrete porosity increased, tend to be more evenly distributed, the honeycomb.