The non-shrinkage grout to use ground fly ash as admixture

Abstract

This study uses fly ash for non-shrinkage grout in order to develop strength of grout and improve its durability. We grind flyash to the extent of 7,000 cm2/g and use ground fly ash and raw fly ash respectively at the proportion of 10%, 20%, 30%instead of OPC and compare the results drawn on the condition of each proportion. As a mixed material of grout, EVA andwater-reducing agent is added in order to prevent bleeding and improve segregation resistance, CSA is added with a view topreventing drying shrinkage and improving early strength property. In regard to flow and flow time test for analyzing andevaluating workability, it is revealed that grouts of all mix proportions except raw fly ash 30% mix proportion satisfy allperformance criteria. With regard to length change rate, grout with no admixture shows the highest shrinkage rate, but therate is 0.0005%, extremely insignificant rate. As material age increases, compressive strength of two grouts, that is to sayground fly ash 10% and 20%-used grouts, exceed that of grout with no admixture or show high-level compressive strength