The Temperature and Pore Pressure Distribution of Lightweight Aggregate Concrete Slabs Exposed to Elevated Temperatures

Concrete has good fire resistance. However, once exposed to rapidly increasing temperatures, concrete may suffer from thermal stress-induced spalling or pore pressure-induced spalling. Compared with normal-weight (NWC), lightweight aggregate (LWAC) a low conductivity and is more prone cause higher temperature gradient under the action of high temperatures. This poses hidden concern safety general LWAC structures. Therefore, this study aimed investigate pressure distribution slabs one-dimensional heating tests compare them NWC slabs. The test variables were moisture content specimen (oven-dried air-dried), target (600 800 °C), rate (5 10 °C/min). distributions measured separately by thermocouples gauges embedded in different positions specimen. results show that maximum (Pmax) was generally than slab at distance mm heated surface when an oven-dried state. 30 50 surface, Pmax tended be higher. shows closer state, while occurred further surface. Further, as increased, generated inside rose rapidly. In particular, °C °C/min, corner phenomenon appeared on air-dried slab.