Experimental study on performances of fibre reinforced micro-surfacing mixture

Aimed at problems of insufficient resistance to cracking and deformation of micro-surfacing mixtures,a fibre reinforced micro-surfacing technique was put forward and its performances were studied.The fibre dispersion,the mixing time,the road performance,and the low-temperature resistance to cracking tests of fibre reinforced micro-surfacing mixtures were carried out.The results indicated that the fibres in fibre reinforced micro-surfacing mixtures could be homogeneously dispersed using the self-developed special equipment.The suitable length of fibres in fibre reinforced micro-surfacing mixtures was 6 mm.When the added volume of fibres was 0.2%,1 h and 6 d wet track abrasion values were the minimums.When the added volume of fibres was 0.1%,the volume of load wheel test(LWT) sand adhesion was the smallest,and as the added volume of fibres was 0.2%,the fibre reinforced micro-surfacing mixture showed better performances and moreover,there was not much difference in the sand adhesion between these two added volumes of fibres.When the added volume of fibres was 0.3%,the low-temperature splitting strength was the greatest.According to the test results of various indexes 0.2% was selected as the optimum added volume of fibres thus it could obtain the better comprehensive performances.