The whole country is changing from four to eight.，Compaction of widened subgrade is essential，To achieve expressway of the road surface.“High quality、Durability、Long life”，The subgrade must be compacted。“Change four to eight”Widening subgrade compaction“Big Mac”——Power YZZT39 Intelligent Direction-Regulating Vibratory Roller is the latest scientific research achievement of CUHK，Avoid collapse and cracks at joints caused by post-construction settlement，Help you out。
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