Hot summer days，Jiayuguan to Anxi Section of Lianhuo Expressway in Gansu Province，The machine roared、The workers are busy，Paver、The rollers operate simultaneously，Paving steel slag asphalt pavement on the pavement。The new road surface is smooth and bright.，People can't help but want to step on a few feet.。According to the on-site construction personnel,，Using steel slag as industrial waste to replace asphalt mixture aggregate，Has wear resistance、Skid resistance、High strength、Ood adhesion with asphalt and the like.，Especially, the sliding resistance attenuation rate of the pavement is only 50% of that of the common asphalt pavement%，Road maintenance quality can be improved，Reduce the exploitation of sand and stone materials，Has obvious economic benefit and environmental protection benefit.。

Geological and climatic conditions are the main factors affecting highway maintenance.，Gansu is a long and narrow region、The climate is diverse，Geology、Climate conditions are complex and diverse.，The total mileage of the highway is 15.70,000 kilometers，The task of highway maintenance is arduous.。“Improve the efficiency of highway maintenance，It has to be‘New’Work hard on words。”Zhang Junren, director of Gansu Highway Development Center, said.，In recent years，The provincial highway maintenance system has been thoroughly implemented“Three new and one high”Request，Continuous strengthening“Four new technologies”Popularization and application，It has formed a set to adapt to the situation of Gansu Province.、Location characteristics、Highway Maintenance Experience in Climatic Environment，It has effectively promoted the provincial highway maintenance to reduce costs and increase efficiency.。

Highway waste pavement 100%Recycle

Multifunctional comprehensive snow removal vehicles、Special vehicle for highway tunnel cleaning、Cold regeneration repair vehicle for asphalt pavement……In recent years，Workers of Highway Maintenance Department of Gansu Province independently develop all kinds of“Minor reform”71 items，Obtained 121 national patents，A new technology、New Technology、New materials、The new equipment solves the problem of insufficient maintenance machinery and equipment.，It also improves the green degree of highway maintenance.。

It's on 311 National Highway（Red Mountain）To Huo（Lezadeguet）Project，Gansu has implemented the largest highway application of solid waste cementitious materials in China.。Dahuo Project is located in the hinterland of Gobi with less precipitation.，The climate is arid、The temperature difference between day and night is large，This kind of climate condition is easy to cause the cracking of the semi-rigid base in the subgrade.。In order to reduce shrinkage cracking in the subgrade,、Dispose of solid waste materials、Reduce carbon dioxide emissions，Dahuo Project actively participates in the key technology research and demonstration research of green intelligent highway in Gansu Province.，A total of 100 kilometers of solid waste-based cementitious materials have been promoted and applied along the whole line.，It is estimated that about 4% of solid waste can be consumed.40,000 tons。

Around“Double Carbon”Aim，Gansu is gradually establishing a system from design、From construction to testing、Green low-carbon highway maintenance system in the whole process of acceptance。expressway、The recovery rate of waste pavement materials of ordinary national and provincial roads has reached 100%、98%Above，The recycling rate reaches 95% respectively%、80%Above。

Super concrete reduces carbon emissions by 60 percent

Recently，Lanzhou Zhongchuan International Airport Phase III Viaduct Project Passenger Landing Platform Steel Bridge，First connection ultra-high performance concrete（UHPC）The bridge deck pavement was successfully completed.。It is reported that，The bridge is the first wide steel structure bridge in Gansu at present.，The deck of the drop-off platform is made of steel—UHPCCombined structure，And improve that transverse rigidity of the bridge deck.，And the fatigue cracking problem of the steel bridge deck is relieved.，It can reduce the diseases of bridge deck concrete in the later period.，Reduce the cost of later operation and maintenance。

It is reported that，UHPCThe material has ultra-high strength and ultra-high toughness performance，Its mechanical properties、Its toughness index and durability are several times to more than ten times that of ordinary concrete.，The I-beam composite structure prepared based on the material can cumulatively reduce carbon emission by 60%，But also can further reduce that fil height of the roadbed.，And that removal and replacement of the old bridge do not need slope adjustment and smooth connection.，Effectively reduce the overall cost of the project。

Stronger or lighter?，ForUHPCThis material，You don't have to choose.。Relying onUHPC，New bridge structure developed in Gansu——Light Industry Girder（Novel long-life high-toughnUHPCLight industry I-beam combined structures），It is light and handy、Green、Safe、Durable、Lower cost and the like.，Applicable to various application scenarios such as new construction and maintenance。Among，312 National Highway Fu（Jiayao）To suffer（Water）The road project has adoptedUHPCHigh-strength concrete slope protection and other new construction technologies，The labor intensity and the actual labor cost are reduced。

A new technology、New Technology、New materials，It is providing a source of power for the continuous improvement of Gansu highway maintenance capacity in the new era.。Look at the long term，Intelligent、The development direction of greening，It is bound to innovate with technology.“Fusion”，Accelerate the level of road conditions in Gansu“Quantitative change”And service effectiveness.“Mutation”。（Yang Tian）