Measurement and Prediction of Damage in High Strength Concrete Due to Fire Induced Moisture Migration

火灾引起的湿气迁移引起的高强度混凝土损坏的测量和预测

• 批准号: 9900015
• 负责人: Gary Consolazio
• 金额: --
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2003-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9900015&HistoricalAwards=false
• 关键词: Measurement; Prediction; Damage; Strength; Concrete

High strength concrete (HSC) is increasingly being used in numerous types of structural systems, however its performance when subjected to fire poses unique concerns. In particular, the very low permeability of HSC can make it especially prone to spalling that is induced by moisture migration. This research will focus on experimentally measuring internal pore pressures in heated HSC elements, on experimentally measuring key material parameters that affect the movement of moisture through heated HSC, and on developing appropriate numeric simulation models. Steady state flow tests will include measurement of intrinsic permeability, relative permeability, and slip flow parameters. Transient heating tests will measure internal pore pressures and strains developed in heated partially saturated HSC elements. Temperature dependency of flow parameters will be examined experimentally. Results obtained from experimental testing will be incorporated into a numeric simulation model so that potential damage mitigation methods can be explored.

高强度混凝土（HSC）越来越多地被用于多种类型的结构系统中，然而其在遭受火灾时的性能引起了独特的关注。特别地，HSC的非常低的渗透性可以使其特别容易由水分迁移引起的剥落。本研究将集中在实验测量内部孔隙压力加热HSC元件，实验测量的关键材料参数，影响水分通过加热HSC的运动，并开发适当的数值模拟模型。稳态流动试验将包括固有渗透率、相对渗透率和滑流参数的测量。瞬态加热试验将测量加热的部分饱和HSC元件中产生的内部孔隙压力和应变。流动参数的温度依赖性将通过实验进行检验。从实验测试中获得的结果将被纳入一个数值模拟模型，使潜在的损害缓解方法可以探索。