Recently，Gansu Province Highway Maintenance Four New Technologies Promotion Meeting Held in Jiayuguan。The new four technologies of highway maintenance refer to new technologies.、New equipment、New Technology、Application of New Materials in Road Maintenance。Gansu Highway System Based on Reality in Road Maintenance，Continuously explore the application of four new technologies，The steel slag of Jiuquan Iron and Steel Group has been turned into treasure through systematic treatment.，Become a paving stone，It is a green attempt to apply the four new technologies.。

Jiuquan Iron and Steel Group is a large iron and steel enterprise in the western region.，Steel slag utilization has always been a hot topic of green development.。Can waste steel slag become a paving stone?，Turning waste into treasure and realizing utilization？Jiayuguan Highway Development Center and Gansu Transportation Planning, Survey and Design Institute Co., Ltd. have actively explored the efficient comprehensive utilization technology of waste steel slag.，Application of Steel Slag in Road Engineering。The purpose is to effectively solve the problem of lack of high-quality stone in Jiajiu area.，Realize the purpose of turning waste into treasure、Energy conservation, emission reduction and ecological protection。

The project manager said.，In recent years，The state and provincial and municipal departments attach great importance to ecological and environmental protection construction.，A number of ecological bans have been introduced.，Gravel extraction is severely restricted，A large number of sand and gravel factories in Jiujia area were closed down.，The market of crushed stone materials is characterized by tight supply and rising prices.。At the same time，The guiding opinions of the State Council on speeding up the establishment and improvement of a green low-carbon circular economy system clearly require，Comprehensive utilization of waste resources in engineering construction should be strengthened，In this context,，Paving the road with the steel slag of Jiuquan Iron and Steel Group is a green and energy-saving road.，It can also achieve win-win results for all parties.。

September 29, 2019，For the first time, Jiayuguan Road Maintenance Unit successfully used waste steel slag to replace part of the gravel to pave a 200-meter steel slag asphalt concrete pavement test section.，In the originalZLine 092K4+260-K4+460（NowX259 linesK16+210-K16+Paragraph 410）For the first time, the waste steel slag was successfully used to replace part of the gravel to pave the 200-meter steel slag asphalt concrete pavement test section.（SMA-13 andAC-16 100 meters of asphalt mixture），After nearly two years of open trials,，The pavement is still in good condition.。

July 19, 2020，Where is Jiayuguan Road Maintenance Unit?G30 Lianhuo ExpresswaySK2449+820-SK2450+The test section of steel slag asphalt concrete pavement was successfully paved in Section 640.，It marks the first successful application of steel slag asphalt concrete technology in Gansu Expressway.。

After that, Jiayuguan Road Maintenance Unit carried out many laying tests.，Solve existing problems，At present, this technology has been basically mature.。

This yearG30 Lianhuo Expressway Upgrading and Reconstruction Project，Jiayuguan Highway Development Center has successfully implemented 45 kilometers of steel slag asphalt pavement.，It is estimated to use more than 30,000 tons of steel slag.。

According to the results of follow-up observations in recent years,，Steel slag asphalt pavement can delay the surface cracking.、And that skid resistance of the road surface is improve，Especially, the sliding resistance attenuation rate of the pavement is only 50% of that of the common asphalt pavement%。Along with that popularization and utilization of such technology,，There will be more and more steel slag as paving stones.，Realize reuse。

At the same time，Four New Technologies Promotion Conference of Highway Maintenance in Gansu Province，It also displayed a number of new technologies.、New equipment、New Technology、Application of New Materials in Road Maintenance，It shows that road maintenance in Gansu is becoming more scientific and technological.，Intelligent、Transformation of green sustainability direction。

For example, new equipment for road asset detection“Mocking the wind”And a road surface condition detection apparatus“Kiss”It can quickly explore the road.，Have“Steel Mantis”Known as the mountain excavator，But the reality of mountain cross-country excavation，Especially in the rescue and disaster relief to open up mountain roads can be independent.。There are also automatic marking robots that can automatically draw lines, which are the continuous exploration of Gansu highway maintenance in four new aspects.。