Effect of alkaline environment on the physical and mechanical properties of silica-based aerogels
HAO Yanming
SHENG Luteng
LU Dahai
SONG Xiaoruan
CUI Haoran
Abstract：In order to study the influence of alkaline building materials such as cement and mortar on the properties of aero-gels,an accelerated aging test with a concentration of 5%NaOH solution was designed,and the effects of alkaline environment on the morphology,bending properties,compressibility and vibration mass loss of silicon-based aerogels were analyzed.The results show that with the increase of soaking time,the hardness of the re-dried aerogel plate gradually decreases,and the physical and mechan-ical properties decrease sharply;When soaked for 14 days,the flexural bearing capacity,compressive strength and compressive modu-lus decrease by 92%,92%and 94%respectively;When soaked for 28 days,the flexural ability is basically lost,and the retention rate of compressive strength and compressive modulus is only 3%～5%;The vibration mass loss rate of the aerogel plate increases first and then decreases with the increase of soaking time,and the loss rate reaches the highest value of 7.00%after soaking for 14 days.Later,the loss rate gradually decreases to 1.88%due to the crystals of NaOH solution precipitating and adhering to the surface of the aerogel plate.
Keywords：silica-based aerogelalkaline environmentbending performancecompression performancevibration mass loss
Publication Date：2026-02-25
Online Publishing Date：2026-03-25(First online date of this platform, not the publication date of the document)
Pages：7( 132-138 )