Rock freezing resistance is used to evaluate the rock’s ability to resist damage when it’s in saturated state and after subject to the required times of freeze-thaw cycles, different engineering environment climate have different requirements for rock freezing resistance. Times of freezing and thawing stipulation: in frost region (the coldest month average temperature is below -15 °C) is 25 times, in the cold region (the coldest month average temperature is below -15 °C) for 15 times.   

      Xi’an Zealchon Electronic Technology Co.,Ltd adhering to the "professional,  honest, and providing the best service" business philosophy, with the guidance of professors and researchers from the Well-known institutions in China,      developed a series of leading domestic and international standards, Technology class detecting instrument for asphalt and asphalt mixture, Road, bridge deck, geotechnical, structural, etc and OEM designed 12 series more than 100 kinds of laser productswith high power and long service time.