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

高强度混凝土（HSC）越来越多地应用于各种类型的结构体系中，但其在火灾中的性能引起了人们的独特关注。特别是，HSC的渗透性非常低，使其特别容易发生由水分迁移引起的剥落。本研究将着重于实验测量加热HSC元件的内部孔隙压力，实验测量影响加热HSC中水分运动的关键材料参数，并建立适当的数值模拟模型。稳态流动测试将包括测量固有渗透率、相对渗透率和滑移流动参数。瞬态加热试验将测量在加热的部分饱和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纳入数值模拟模型，以便可以探索潜在的减轻损害的方法。

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.