Surface Hydrophobic Modification Methods and Mechanisms of Recycled Aeolian Sand Aggregates
LI Chuang
REN Yongfeng
ZHANG Hong
WU Ping
YANG Yaxiong
Abstract：To address the issue of small particle size,large specific surface area and high water absorption when aeolian sand was used as concrete aggregate,a large particle size surface hydrophobic recycled aeolian sand was prepared using cementation and surface hydrophobic modification.The results demonstrate that the water absorption of the recycled aeolian sand modified by a silane coupling agent with silicone resin is significantly reduced,and the modifier ratio has less influence on the water absorption of the recycled aeolian sand.Furthermore,hydrophobic modification does not reduce the strength of the recycled aeolian sand and the bond strength between recycled aeolian sand aggregate and cement stone.The mechanical properties and workability of concrete prepared with surface-modified recycled aeolian sand are significantly improved.The hydrophobic modification can optimize the surface microstructure of recycled aeolian sand and increase its surface contact angle.
Keywords：aeolian sandrecycled aggregatehydrophobic modificationsilane coupling agentorganic silicone resinconcrete
Publication Date：2025-03-31
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 270-275 )