省下数千万！宁诺这项技术让高速废土变宝，杭甬高速已用上

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

宁诺科研团队“三步”实现渣土全利用

高速公路废土变身路基材料

高速公路建设产生的海量废弃渣土，向来是工程界的“生态包袱”与“成本负担”，宁波诺丁汉大学土木工程系王娟教授团队通过一套一体化工艺破解难题，将废弃渣土转化为合格高速公路路基材料，不仅拿下宁波市科技进步奖，更率先实现工程渣土在浙江高速公路主路的规模化应用，累计节约工程成本数千万元，走出一条“绿色筑路”的创新路径。

PART.01

从泥浆到路基的技术跨越

2018年春，一次企业走访成为技术突破的起点。当时，宁波交通工程集团有限公司提出一个现实困境：一个高速公路建设项目，预计约产生40万立方米的渣土，若按传统方法，长途运输、远洋抛填，每方成本超百元，仅弃土费就高达数千万元。而路基填筑又需另购新材料，一来一回造成巨大的经济浪费和环境压力，固废就地资源化迫在眉睫。

技术攻关最大的核心难题在于渣土的“三高”：高含水率、高孔隙比、高压缩性，无法直接用作路基材料。而传统自然沉降占用大量土地、处理效率极低，赶不上工程进度且环境污染风险高。

王娟教授团队瞄准痛点，提出三步法处理工艺。首先，通过添加特殊材料，促使悬浮液中的微细土粒快速成团并沉降，随后利用压滤设备实现高效固液分离，获得含水率较低的泥饼。接着，引入多种改良材料，让颗粒更“干爽”，同时增加粘性让它们“手拉手”。最后，对处理过的渣土进行压实及养护，使其咬合得更加紧密，最终转换为性能优异、符合标准的高速公路路基填料，实现了废弃渣土的资源化利用。

“应用型科研的关键，是填平实验室与生产线之间的鸿沟，提供企业用得上、用得起、能量产的技术方案。”王娟教授强调，团队反复优化材料配方与工艺参数，在确保再生材料强度达标、密度更优的同时，着力提升经济性。

PART.02

省下数千万

经济账与环境账双赢

这项成果率先在杭甬高速复线落地，成为浙江省首个将工程渣土用于高速主路建设的示范项目。项目中的40万方弃土全部就地消纳，实现零外运；经权威检测，再生路基材料完全满足高速各项指标要求；相关路段已实现通车，技术成熟度与可靠性得到工程实战验证。

目前，该技术已在宁波多条高速推广应用，助力打造“零废弃工地”，形成可推广的绿色建造模式。

更值得一提的是，相比传统路基材料，新型再生填料密度更低，可有效减轻路基自重、抑制不均匀沉降，延长道路使用寿命。

除显著的经济效益，这笔“环境账”同样可观，王娟教授换算道：“40万方渣土如果堆在一个标准足球场上，有18到19层楼那么高。现在全部实现了资源化利用，大幅减少了运输车辆的碳排放，也降低了对海洋环境的影响。”这对土资源紧缺且弃土量大的浙江而言，意义尤为深远。

“既帮企业省钱，又为社会减负，还为环保出力，是一条走得通、可持续的绿色建造路径。”王娟教授说。

王娟教授团队并未止步于此。在路基填料之外，他们还联合其他高校和企业，探索将渣土转化为更多实用产品。“在工程领域，技术创新必须充分考虑企业需求。我们要做的，不仅是追求科学与技术的突破，也要致力于填平科研与产业之间的那道‘鸿沟’。”她透露，目前团队的重点是以实际问题为导向，通过土木工程与其他学科的交叉互补，攻克更深层次的行业痛点与技术难题。

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.

图文来源：Lucrecia Zhou，Tony Bao

电子编辑：Suri An

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