Role of Chemical Bonding on Durability of Epoxy Adhesion to Mortar
化学键对环氧砂浆粘合耐久性的作用
基本信息
- 批准号:0653969
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2007
- 资助国家:美国
- 起止时间:2007-06-01 至 2011-05-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This grant provides funding to investigate the chemical interactions at the interface between epoxy and cement paste or mortar, and the effect of water on those interactions. Based on what is known about the surface chemistry of cement paste, and by analogy with epoxy adhesion to aluminum, we propose that epoxy forms hydrogen bonds with cement paste. In the presence of water, these water-cement paste bonds are displaced by the water molecules, leading to a weakening of the interface. We propose to test this hypothesis through a combination of spectroscopic and mechanical measurements. The surface chemistry of epoxy, cement paste, and mortar will be identified using x-ray photoelectron spectroscopy (XPS) and attenuated total reflection infrared spectroscopy (ATR-IR). Bonding between the two will be identified by placing a thin epoxy coating on the cement paste or mortar and identifying the bonds with XPS and ATR-IR. The role of hydrogen bonds will be quantified by modifying the surfaces to change the surface concentration of hydrogen bonds and by quantitative analysis of the XPS and ATR-IR spectra. The effect of water will be identified using both spectroscopic and mechanical measurements on specimens that have been immersed at 30, 40, 50, or 60 C for up to 12 weeks. Direct tension pull-off tests will be used to measure changes in bond strength as a function of immersion and surface treatment and correlated to the changes in bonding observed with XPS and ATR-IR.This project will provide new insights into the adhesion between epoxy and cement paste and how environmental exposure affects that adhesion and the resulting properties. The primary objective of the project is to provide the fundamental science needed to understand the behavior of these materials when used in real-world applications. The results may be used to develop improved models of aging for lifetime prediction of systems in which epoxy is bonded to cement. It may also provide guidance for developing new materials with improved performance and lifetime.
这笔赠款提供资金,用于研究环氧树脂与水泥浆体或砂浆界面的化学作用,以及水对这些作用的影响。在已知的水泥浆体表面化学的基础上,类比于环氧树脂与铝的粘接,我们提出了环氧树脂与水泥浆体形成氢键的观点。在水的存在下,这些水-水泥浆体键被水分子取代,导致界面弱化。我们建议通过光谱测量和机械测量相结合的方法来检验这一假设。使用X射线光电子能谱(XPS)和衰减全反射红外光谱(ATR-IR)对环氧树脂、水泥浆体和砂浆的表面化学进行鉴定。两者之间的结合将通过在水泥浆体或砂浆上涂上一层薄薄的环氧涂层,并用XPS和ATR-IR识别结合来识别。氢键的作用将通过修饰表面来改变表面氢键的浓度,并通过XPS和ATR-IR光谱的定量分析来量化。水的影响将在30、40、50或60摄氏度下浸泡长达12周的样品上使用光谱和机械测量来确定。直接拉伸拉拔试验将被用来测量粘结强度随浸泡和表面处理的变化,并与XPS和ATR-IR观察到的粘结变化相关联。该项目将为环氧树脂和水泥浆体之间的粘合以及环境暴露如何影响粘合和所产生的性能提供新的见解。该项目的主要目标是提供所需的基础科学,以了解这些材料在实际应用中的行为。这一结果可用于开发改进的老化模型,用于预测环氧树脂与水泥粘结的体系的寿命。它还可以为开发性能更好、寿命更长的新材料提供指导。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Elliot Douglas其他文献
A narrative exploration of the in/authentic experiences of Black engineering interns (Work in Progress)
对黑人工程实习生的真实/真实经历的叙事探索(正在进行中)
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
Gretchen A. Dietz;Elliot Douglas;Erica McCray - 通讯作者:
Erica McCray
Elliot Douglas的其他文献
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{{ truncateString('Elliot Douglas', 18)}}的其他基金
Collaborative Research: Research Initiation: Defining Engineering Quantitative Literacy
合作研究:研究启动:定义工程定量素养
- 批准号:
2204971 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Standard Grant
Collaborative Research: Engineering Ethics Education for Social Justice
合作研究:工程伦理教育促进社会正义
- 批准号:
1933652 - 财政年份:2020
- 资助金额:
-- - 项目类别:
Standard Grant
The In/authentic Experiences of Black Engineers
黑人工程师的真实经历
- 批准号:
1827377 - 财政年份:2018
- 资助金额:
-- - 项目类别:
Standard Grant
Empirical Study on Emerging Research: The Role of Epistomological Beliefs and Cognitive Processing on Engineering Students' Ability to Solve Ambiguous Problems
新兴研究的实证研究:认识论信念和认知加工对工科学生解决模糊问题能力的作用
- 批准号:
0909976 - 财政年份:2009
- 资助金额:
-- - 项目类别:
Continuing Grant
Guided Inquiry Activities for Introduction to Materials
材料介绍的引导式探究活动
- 批准号:
0633073 - 财政年份:2007
- 资助金额:
-- - 项目类别:
Standard Grant
NANOSCALE: Nanostructured Composites via Biomimetic Processing
NANOSCALE:通过仿生加工的纳米结构复合材料
- 批准号:
9986333 - 财政年份:2000
- 资助金额:
-- - 项目类别:
Standard Grant
Seminar Workshops on Material Science & Technology
材料科学研讨会
- 批准号:
9752721 - 财政年份:1998
- 资助金额:
-- - 项目类别:
Standard Grant
相似国自然基金
Chinese Journal of Chemical Engineering
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Chinese Journal of Chemical Engineering
- 批准号:21024805
- 批准年份:2010
- 资助金额:20.0 万元
- 项目类别:专项基金项目
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