Enhancing stiffness and strength of super-absorbent-polymers-solidified excavated spoils and slurries

提高高吸水性聚合物固化开挖弃土和泥浆的刚度和强度

• 批准号: 522183-2017
• 负责人: Sharma, Jitendrapal
• 金额: $ 1.82万
• 依托单位: York University
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=639843
• 关键词: Enhancing; stiffness; strength; super; absorbent

Hydraulic excavators are increasingly being used for excavations needed for repair or replacement of buriedinfrastructure, such as water mains, sewers, communication cables, etc. Because of their high water content,hydraulic excavation spoils have a sludge-like consistency and can neither be disposed off as solid waste norrecycled nor reused as a backfill. The disposal problem can be addressed by adding super-absorbent polymers(SAPs) to the spoils. SAPs can absorb several hundred times their own mass in water, thereby providing"instant" solidification of the spoils and facilitating their disposal as solid waste. Provision of SAP-basedsolidification solutions to a broad range of applications, including spoils from hydraulic as well as traditionalexcavations and tunnelling, is one of the core businesses of the industry partner MetaFLO. MetaFLO's clientsare looking for ways of using SAP-solidified spoils as a backfill material for post-repair closure of excavations.Presently, SAP-solidified spoils cannot be used to backfill excavations because of lack of information on theirexpected geotechnical properties and must be transported and disposed at solid waste disposal sites. A keyobjective of the proposed project is to identify the threshold inherent water content of the spoils above whichthe use of SAPs to solidify the spoils will not result in a fill that is of sufficient stiffness and strength to permitits use as a fill or a backfill. The project will also explore mixing of natural soils with the SAP-solidified spoilsto enhance stiffness and strength of the spoils. The overarching goal of the project is to develop guidelines forthe use of SAPs, which can be used by contractors to establish the relative proportions of spoils, SAPs, andnatural soils to achieve desirable geotechnical properties of the resulting mix based on the measured inherentwater content of the spoils. A comprehensive lab testing program that uses the state-of-the-art geotechnical labtesting facilities at York is proposed in which combinations of clay slurries prepared at different watercontents, two types of SAPs, and general-purpose Portland cement as binding agent are used to ascertainAtterberg limits, stiffness, strength, compaction, and hydraulic flow properties of the resulting mixes.

液压挖掘机正越来越多地被用于挖掘需要修复或更换埋在地下的基础设施，如水管，下水道，通信电缆等，因为它们的高含水量，液压挖掘废料具有淤泥般的一致性，既不能作为固体废物处理，也不能回收，也不能作为回填再利用。处理问题可以通过向腐败物中添加高吸水性聚合物（SAP）来解决。SAP可以吸收数百倍于其自身质量的水，从而提供“即时”固化的腐败，并促进其作为固体废物处置。为广泛的应用提供基于SAP的固化解决方案，包括水力以及传统挖掘和隧道开挖的废土，是行业合作伙伴MetaFLO的核心业务之一。MetaFLO的客户正在寻找使用SAP固化的弃土作为开挖修复后封闭的回填材料的方法。目前，SAP固化的弃土不能用于回填开挖，因为缺乏关于其预期岩土性能的信息，必须在固体废物处置场运输和处置。拟议项目的一个主要目标是确定土壤的固有含水量阈值，超过该阈值，使用SAP固化土壤将不会导致填料具有足够的刚度和强度，从而允许用作填料或回填。该项目还将探索将自然土壤与SAP固化的弃土混合，以提高弃土的刚度和强度。该项目的总体目标是制定SAP使用指南，承包商可使用该指南确定弃土、SAP和天然土壤的相对比例，以根据测得的弃土固有含水量，实现所得混合物的理想岩土工程特性。一个全面的实验室测试计划，使用国家的最先进的岩土工程labtesting设施在约克提出了在不同的含水量，两种类型的SAP，和通用波特兰水泥作为粘合剂的粘土泥浆的组合，用于ascertainAtterberg限制，刚度，强度，压实，和水力流动性能的混合。