The General Directorate of Technical and Mechanical Soil Laboratory of Tehran province is one of the branches of the Technical and Mechanical Soil Laboratory Company of the Ministry of Roads and Urban Development with more than 36 years of experience and has an experienced and expert staff in the field of quality control of construction projects. This general office is in line with the goals and missions of the soil technical and mechanical laboratory company, which is to improve the quality in the construction projects of Tehran province and its subordinate cities in the field of bitumen and asphalt - concrete and metals - physical and chemical construction materials - non-destructive and Calibration of laboratory devices is engaged in providing technical and engineering services in the form of 6 city branches and 30 established workshops.