I am supervising the black top road construction. Here I can say that bitumen coating to chips is fear and good but the adhesion to chips to chips is poor even after rolling. To my knowledge there must be proper compaction with good adhesion between chips. The Contractor is using plant that heats the chips and hot bitumen is poured into it for mixing. The plant requires kerosene/Diesel for burning, thus heating chips. Please suggest what might be the causes for such results and remedial measures. The average temperature of road surface might be 30 degree Celsius. Its urgent.