Study on the Properties and Microscopic Characteristics of Organic Water-hard Semi-flexible Base Layers
In order to study the performance and microscopic characteristics of semi-rigid base mix with emulsified asphalt,on the basis of understanding the physical and chemical properties of raw materials and determining the amount of cement dosing,we designed five kinds of mix ratios,and investigated the mechanical and cracking performance of the mix at different ages through the unconfined compressive strength test,drying shrinkage and temperature shrinkage test,and analysed the effects of the material composition and microstructure of the performance according to the EDS spectroscopy and SEM scanning electron microscopy.The results showed that with the increase of the effective dosage of emulsified asphalt,the unconfined compressive strength and the coefficient of drying shrinkage and temperature shrinkage of the mixture showed a decreasing trend;when the dosage was less than 2％,the 7 d unconfined compressive strength met the strength requirements of the first class highway with extremely heavy traffic load.Microscopic character analysis found that asphalt and cement hydration products together constitute a spatial structure network,making the mix structure more dense,but asphalt impedes part of the cement hydration,but also affects the formation of the spatial structure network,and ultimately make the mix of the lower unconfined compressive strength,cracking resistance enhanced.
effective content of emulsified asphaltanti-cracking propertiesmicrostructurematerial composition
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