新型石窟寺裂隙灌浆材料水硬性石灰H·C5和NHL5性能对比研究OA

Hydraulic lime,with both air-hardening and hydraulic properties,is an important restoration material for fissure grouting in grotto temples.However,high-quality hydraulic lime has long been depended on imports and is expensive,which severely restricts its widespread application.To explore the feasibility of replacing imported natural hydraulic lime(NHL5)with domestic hydraulic lime(H·C5)developed by the research team,X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),and scanning electron microscopy(SEM)were used to analyze the composition and micromorphology of hydration and carbonation products in the cement-sand set bodies of H·C5 and NHL5 at different curing ages.Meanwhile,physicomechanical properties such as shrinkage rate,elastic wave velocity,flexural and compressive strengths,and durability were measured.In addition,comparative tests on the bonding performance between mortar and typical sandstone samples from Qingyang Beishiku Temple were conducted to evaluate their on-site applicability.The results showed that H·C5 and NHL5 have similar chemical compositions and nearly the same shrinkage rate.Within the curing period,H·C5 is superior to NHL5 in terms of elastic wave velocity,flexural and compressive strengths,and bonding performance,indicating that H·C5 has good mechanical strength and structural stability.It can serve as an effective domestic alternative to NHL5,which is expected to significantly reduce the cost of rock mass reinforcement in grotto temples,and promote the independent research and development sustainable development of protection materials for rock and soil cultural relics in China.