| In recent years,with the cement processing,road construction,such as increasing the demand for fly ash,fly ash prices all the way up.The amount of fly ash(also known as seawater ash)washed with seawater in various thermal power plants is very large,and because of its high salt content,the strength of its mixture is low,so it can not be applied to road construction.Therefore,it is necessary to use this sea water fly ash in road construction,to achieve the purpose of turning waste into treasure,not only to save resources but also to protect the environment.On the basis of theoretical analysis and analysis of X-ray diffraction and scanning electron microscopy(SEM),the strength formation principle of cement-seawater asphalt mixture and the effect of chloride ion on the strength were analyzed.A method of improving the activity of seawater fly ash by using cement as external admixture was put forward.On the basis of this,the relevant indoor experiments were carried out,and the road construction in Dagang Road was verified by the experimental road.Based on the above indoor and outdoor research results,the seawater fly ash mixture in semi-rigid base was obtained.Various road performance,the main conclusions are as follows:1.Chloride salt can inhibit the initial strength of cement-seawater mixture.When the chlorine content in seawater is about 1.4%,the strength of cement-seawater mixture can reach the highest.2.The frost resistance of cement-seawater asphalt mixture is insensitive to the change of chloride content in seawater ash.3.The dry shrinkage of cement seawater mixture is affected by the content of chloride ions.With the increase of chloride ion,the shrinkage strain increases rapidly,and the shrinkage coefficient also increases.In addition,the temperature shrinkage of seawater fly ash mixture is not affected by the content of chlorine in seawater ashes.4.The anti-erosion performance of cement-seawater asphalt mixture decreases with the increase of chloride content. |
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