Development of novel ultra-high-performance lightweight concrete modified with dehydrated cement powder and aerogel

Abstract

Currently, researchers emphasize creating eco-friendly, ultra-high-performance lightweight concrete (UHPLC) due to the extensive cement demand of ultra-high-performance concrete. This study aimed to develop such UHPLC by incorporating dehydrated cement powder (DCP) and aerogel (AG) at varying levels (5-25%) alongside double-hooked end steel fibers (DHE-SFs). Objectives were to enhance strength, durability, density, and thermal/acoustic properties. Results revealed reduced flowability with higher DCP and AG content. 5%, 10%, and 15% DCP and AG improved compressive strength (17.3%) via better packing and bond formation. Density decreased up to 8.3% with more DCP and AG. Modified mixtures resisted sulfate attack and exhibited increased compressive strength retention. Shrinkage reduced to 958 µ with more DCP and AG, notably in M6-DCP25-AG25. Thermal stability improved with only 75.4% mass loss at 1000 °C, while thermal conductivity decreased to 0.274 W/m·°C. Sound absorption and pore volume increased in modified mixes. X-ray diffraction analysis showed higher crystalline phases with increased DCP and AG.