TY - JOUR A1 - Heap, M.J. A1 - Lavallée, Y. A1 - Laumann, A. A1 - Hess, K.-U. A1 - Meredith, P.G. A1 - Dingwell, D.B. A1 - Huismann, Sven A1 - Weise, Frank T1 - The influence of thermal-stressing (up to 1000 °C) on the physical, mechanical, and chemical properties of siliceous-aggregate, high-strength concrete N2 - High-strength concrete (HSC) will experience thermal microcracking, explosive spalling, and undesirable chemical changes when exposed to high temperatures, such as during fire, engulfment by lava flow, or nuclear meltdown. Knowledge of the resultant changes in mechanical, physical, and chemical properties is paramount for hazard mitigation. We present a multidisciplinary study on the influence of thermal-stressing on HSC. Our study shows that thermal microcracking in HSC initiates at 180 °C, is more prevalent during cooling, and exhibits the Kaiser 'temperature-memory' effect. We show that residual compressive strength, indirect tensile strength, ultrasonic wave velocities, and Young’s modulus and Poisson’s ratio decrease, whilst porosity and permeability increase with increasing temperature. We discuss these data in terms of the chemical changes during thermal-stressing, provided by thermo-gravimetric analysis, differential scanning calorimetry, and X-ray diffraction, and from optical microscopic analysis of thermally-stressed samples. We provide implications for thermally-damaged HSC structures and a new method for non-destructive monitoring. KW - High strength concrete KW - Fire KW - Thermal-stressing KW - Acoustic emissions KW - Physical properties KW - Elastic moduli KW - Uniaxial compressive strength KW - Indirect tensile strength KW - Thermo-gravimetric analysis KW - X-ray diffraction PY - 2013 U6 - https://doi.org/10.1016/j.conbuildmat.2013.01.020 SN - 0950-0618 VL - 42 SP - 248 EP - 265 PB - Elsevier Ltd. CY - Amsterdam AN - OPUS4-27992 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -