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壁画空鼓是莫高窟第85窟的主要病害之一,针对空鼓壁画的具体特征,选择多种充填材料,以不同配比配制的81种灌浆材料,经过性能测试及现场模拟试验,最终筛选出了以澄板土(一种当地河床沉积黏土)为主、掺加适量浮石和玻璃微珠作为充填剂,水中加适量蛋清为主剂配制的灌浆材料。这种浆液具有容重小、流动性好、结石体透气性好、收缩率小、黏结强度适中并且可调等特点。现场试验表明,这种材料是莫高窟第85窟空鼓壁画灌浆加固的理想材料。
Mural hollowing is one of the main diseases in Cave 85 of Mogao Grottoes. According to the specific characteristics of hollowing murals, a variety of filling materials are selected, and 81 grouting materials are prepared in different proportions. After performance tests and field simulation tests, The grouting material was prepared from Chengcun clay (a kind of local riverbed sedimentary clay) with appropriate amount of pumice and glass beads as fillers and water as the main agent. This slurry has a small bulk density, good fluidity, good permeability of stone body, shrinkage rate is small, moderate and adjustable bond strength and so on. Field tests show that this material is the ideal material for grouting and reinforcement of hollowing murals at Cave 85 of Mogao Grottoes.