The Research On Durability Of Limestone Used For Asphalt Pavement Surface Layer

At present, road workers favor overly above basalt used in asphalt pavement layer.Under the condition of uneven distribution and insufficient reserves, due to the rapiddevelopment of highway industry in recent years, a large number of basalt stone is consumedand the price jumps up, leading highway project cost increasing rapidly. Therefore, searchingthe substitute of basalt stone is necessary particularly, while the limestone stone isinexpensive and large reserves, distributing widely. Therefore, this article combining theentitative engineering studys on the suitability and durability of limestone stone used forasphalt pavement surface layer.Firstly, this paper studys the limestone stone’s own performance, crushing value, impactvalue, abrasion value, polishing value, efflorescene, and the basalt stone and limestone stonematerials from different producing areas are compared. It is found that different lithologicstones have different properties, even the difference is very big, and the same lithology stonefrom different areas are also different. Many performances of stone are not independent, andthere are correlation of different degrees. Secondly, this article studys the anti-crushingperformance of SMA-13of different stone by changing marshall specimen moldingcompaction times, then it analyzes the crushing degree of aggregate by using centrifugalextraction method. Research shows that limestone SMA-13anti-crushing performance is abit poorer than basalt, and the resistances to crushing of limestone different origin are alsodifferent. Thirdly, based on the analysis of road anti-sliding mechanism, this paper simulatesanti-sliding wear resistance of different stone SMA-13indoor. Using cement concreteabrasion tester and the test method it analyzes the grinding amount and the variation law withgrinding increasing. This paper refits the cement concrete abrasion tester and studies thewear-resisting performance and attenuation law, and the results prove that this method is simple,practical, effective.