Alkali-silica reaction of concrete with admixtures

The effects of calcium nitrite solution, fly ash, silica fume, and their co mbination on the alkali-silica reaction were studied experimentally accordi ng to ASTM C 227 (mortar bar test). To explore the mechanism of such effect s, chemically combined water tests and X-ray diffraction examinations were also conducted. The microstructural information provided by these experimen ts was in agreement with the macroscopic observations. A neural network ana lysis was then conducted to study the feasibility of the prediction of a th eoretical model. To solve the consequent nonlinear coupled equations, Some globally convergent skills were adopted. The results showed that a cascade- correlation algorithm could produce reasonable outputs that coincide with t he experimental results after proper training.