SGER: Are High Carbon Fly Ashes (HCFAS) Effective Stabilizers for Soft Organic Soils?

SGER：高碳飞灰 (HCFAS) 是软质有机土壤的有效稳定剂吗？

• 批准号: 0343079
• 负责人: Craig Benson
• 金额: $ 6.6万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-15 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0343079&HistoricalAwards=false
• 关键词: SGER; Carbon; Fly; Ashes; HCFAS

Cementitious Class C fly ashes, as well as other cementing agents, have been found to be very effective stabilizers for soft inorganic soils, but are essentially ineffective at stabilizing soft organic soils. However, preliminary test data developed by the PIs has shown that soft organic soils can be effectively stabilized with cementitious high-carbon fly ashes (HCFAs), i.e., fly ashes with organic carbon content 3%. The objective of this SGER is to explore the feasibility of using HCFAs for stabilizing soft organic soils. This concept is novel because a long-standing unsolved problem (stabilization of soft organic soil) is being solved by a new approach with a material (HCFA) that is currently landfilled. The concept is also high risk, because a very limited data set has been developed showing that HCFAs are indeed effective stabilizers for soft organic soils. However, the potential rewards are substantial. Successful results from this study could make HCFAs the material of choice for stabilizing soft organic soils (a problem heretofore unresolved), foster sustainable development and sustainable construction practices, reduce construction costs, and improve the environment by reducing the volume of fly ash being landfilled. The hypotheses to be tested are as follows: (i) soft organic soils can be effectively stabilized with HCFAs and (ii) the organic carbon in HCFAs is the primary factor responsible for successful stabilization of organic soils with HCFAs. A research program consisting of four tasks is proposed to test these hypotheses. The tasks include physical and chemical characterization of three soft organic soils and three HCFAs that represent a broad range of organic matter (soil) and organic carbon (fly ash) contents, unconfined compression testing of mixtures of the organic soils and HCFAs, microstructural analyses to evaluate cementation in these mixtures, and an evaluation of curing rates to indirectly assess how the organic matter content and organic carbon content affect cementation kinetics.

胶结级的c粉灰和其他胶结剂已被发现是柔软无机土壤的非常有效的稳定剂，但基本上在稳定柔软的有机土壤方面无效。 但是，PIS开发的初步测试数据表明，可以用胶结的高碳粉灰（HCFAS）有效地稳定软有机土壤，即具有有机碳含量的粉煤灰3％。 该SGER的目的是探索使用HCFA稳定软有机土壤的可行性。 这个概念是新颖的，因为一个长期存在的未解决的问题（稳定软有机土壤）正在通过目前被填埋的材料（HCFA）的新方法（HCFA）解决。该概念也是高风险，因为已经开发出非常有限的数据集表明HCFA确实是软有机土壤的有效稳定剂。 但是，潜在的奖励是可观的。这项研究的成功结果可能使HCFA成为稳定软有机土壤（迄今尚未解决的问题），促进可持续发展和可持续建筑实践，降低建筑成本并通过减少垃圾填充粉煤灰的数量来改善环境的首选材料。 要测试的假设如下：（i）软有机土壤可以通过HCFA有效稳定，（ii）HCFAS中的有机碳是负责成功稳定HCFAS有机土壤的主要因素。 提出了一个由四个任务组成的研究计划来检验这些假设。 任务包括三种柔软有机土壤的物理和化学表征以及三个代表广泛的有机物（土壤）和有机碳（粉煤灰）含量的HCFA，无限制的有机土壤和HCFA的混合压缩测试，微观结构分析，以评估这些混合物的质量和评估速率，并评估固化速率，并评估固化速率，并评估固定速率，并评估固定速率，并评估固定速率，并评估固定速率，并评估固定速率，并评估固定速率，并评估固定速率，并评估了固定速率，并评估了固定速率，并评估了固定速率，并评估了固定率的固定速率。胶结动力学。