Orthogonal experimental studies on the influence of fly ash to the compressive strength of cement-soil

Abstract：With the notable characters of fly ash and its application in the engineering fields, fly ash, cement and water-cement ration were taken as variable parameters in the experiment.The effect of the three elements on compressive strength of cement-soil in different phrases were explored with orthogonal experiment method.Meanwhile, the differences between various element levels were analyzed.The result shows that the mixing quantity of cement has the maximum effect on the compressive strength of cement-soil, some effect on water-cement ratio.Fly ash has no effect in earlier stage, and some effects in the later stage.Moreover, when the mixing quantity of fly ash is 20% of the cement, the compressive strength of cement-soil will reach the highest level.The conclusion provides reference for the theoretic investigation and design of engineering.

Keyword：cement-soil;fly ash;water-cement ratio;orthogonal experiment;compressive strength;