Please scroll down for the English version - UNNC research team transforms construction waste into sustainable motorway materials.

寧諾科研團隊“三步”實現渣土全利用

高速公路廢土變身路基材料

高速公路建設產生的海量廢棄渣土，向來是工程界的“生態包袱”與“成本負擔”，寧波諾丁漢大學土木工程系王娟教授團隊通過一套一體化工藝破解難題，將廢棄渣土轉化為合格高速公路路基材料，不僅拿下寧波市科技進步獎，更率先實現工程渣土在浙江高速公路主路的規模化應用，累計節約工程成本數千萬元，走出一條“綠色筑路”的創新路徑。

PART.01

從泥漿到路基的技術跨越

2018年春，一次企業走訪成為技術突破的起點。當時，寧波交通工程集團有限公司提出一個現實困境：一個高速公路建設項目，預計約產生40萬立方米的渣土，若按傳統方法，長途運輸、遠洋拋填，每方成本超百元，僅棄土費就高達數千萬元。而路基填筑又需另購新材料，一來一回造成巨大的經濟浪費和環境壓力，固廢就地資源化迫在眉睫。

技術攻關最大的核心難題在于渣土的“三高”：高含水率、高孔隙比、高壓縮性，無法直接用作路基材料。而傳統自然沉降占用大量土地、處理效率極低，趕不上工程進度且環境污染風險高。

王娟教授團隊瞄準痛點，提出三步法處理工藝。首先，通過添加特殊材料，促使懸浮液中的微細土粒快速成團并沉降，隨后利用壓濾設備實現高效固液分離，獲得含水率較低的泥餅。接著，引入多種改良材料，讓顆粒更“干爽”，同時增加粘性讓它們“手拉手”。最后，對處理過的渣土進行壓實及養護，使其咬合得更加緊密，最終轉換為性能優異、符合標準的高速公路路基填料，實現了廢棄渣土的資源化利用。

“應用型科研的關鍵，是填平實驗室與生產線之間的鴻溝，提供企業用得上、用得起、能量產的技術方案。”王娟教授強調，團隊反復優化材料配方與工藝參數，在確保再生材料強度達標、密度更優的同時，著力提升經濟性。

PART.02

省下數千萬

經濟賬與環境賬雙贏

這項成果率先在杭甬高速復線落地，成為浙江省首個將工程渣土用于高速主路建設的示范項目。項目中的40萬方棄土全部就地消納，實現零外運；經權威檢測，再生路基材料完全滿足高速各項指標要求；相關路段已實現通車，技術成熟度與可靠性得到工程實戰驗證。

目前，該技術已在寧波多條高速推廣應用，助力打造“零廢棄工地”，形成可推廣的綠色建造模式。

更值得一提的是，相比傳統路基材料，新型再生填料密度更低，可有效減輕路基自重、抑制不均勻沉降，延長道路使用壽命。

除顯著的經濟效益，這筆“環境賬”同樣可觀，王娟教授換算道：“40萬方渣土如果堆在一個標準足球場上，有18到19層樓那么高。現在全部實現了資源化利用，大幅減少了運輸車輛的碳排放，也降低了對海洋環境的影響。”這對土資源緊缺且棄土量大的浙江而言，意義尤為深遠。

“既幫企業省錢，又為社會減負，還為環保出力，是一條走得通、可持續的綠色建造路徑。”王娟教授說。

王娟教授團隊并未止步于此。在路基填料之外，他們還聯合其他高校和企業，探索將渣土轉化為更多實用產品。“在工程領域，技術創新必須充分考慮企業需求。我們要做的，不僅是追求科學與技術的突破，也要致力于填平科研與產業之間的那道‘鴻溝’。”她透露，目前團隊的重點是以實際問題為導向，通過土木工程與其他學科的交叉互補，攻克更深層次的行業痛點與技術難題。

UNNC research team transforms construction waste into sustainable motorway materials

A research team led by Professor Wang Juan from the Department of Civil Engineering at the University of Nottingham Ningbo China (UNNC) has developed an innovative method for transforming construction spoil into high-performance motorway subgrade material, offering a sustainable solution to one of the construction industry’s most persistent environmental challenges.

The team’s integrated three-step process — flocculation, modification and reinforcement — enables waste spoil generated during motorway construction to be fully recycled and reused on site. The technology has already been successfully applied in the Hangzhou–Ningbo Expressway extension project, marking Zhejiang Province’s first large-scale use of engineering spoil in motorway main carriageway construction.

Traditionally, large volumes of excavated spoil are transported over long distances for disposal, creating significant financial and environmental costs. One motorway project alone was expected to generate approximately 400,000 cubic metres of spoil, with conventional disposal costs amounting to tens of millions of RMB. At the same time, new materials would normally need to be purchased separately for roadbed construction.

Professor Wang’s team addressed the challenge by developing a process capable of treating spoil characterised by high moisture content, high compressibility and poor engineering performance. The method first separates solids from liquids in waste slurry before improving the material properties through chemical modification and compaction, ultimately producing roadbed fill that meets motorway engineering standards.

“Applied research should bridge the gap between laboratory innovation and industrial practice,” said Professor Wang. “Our goal is to develop technologies that are practical, affordable and scalable for industry use.”

The project has delivered both economic and environmental benefits. All spoil from the demonstration project was reused on site, eliminating the need for off-site disposal and reducing transport-related carbon emissions. The recycled material also has a lower density than traditional fill materials, helping to reduce subgrade weight, minimise uneven settlement and extend the lifespan of roads.

The achievement earned the team the Second Prize for Scientific and Technological Progress in Ningbo and has since been promoted across multiple motorway projects in the region, contributing to the development of “zero-waste construction sites”.

Currently, the research team is prioritising tackling deep-seated industry pain points and complex technical challenges through interdisciplinary innovation.

圖文來源：Lucrecia Zhou，Tony Bao

電子編輯：Suri An

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