基于仰韶水泥的砂岩石窟裂隙灌浆材料物理力学特性研究

Study on the physical and mechanical properties of the grouting materials of Yangshao cement applied on the sandstone grottoes cracks

为寻找适宜砂岩石窟岩体裂隙灌浆的材料,进行了基于仰韶水泥的砂岩石窟岩体裂隙灌浆材料室内筛选。研究表明,以烧料礓石为胶凝材料,以偏高岭土、石英砂为填料的浆液可作为砂岩石窟裂隙灌浆的初选材料。进一步试验表明,当浆液材料添加总质量10%膨胀剂后,最优的配比为烧料礓石、偏高岭土、石英砂以质量比1∶0.6∶0.4,最佳水灰比为0.5~0.6。针对该配比的灌浆材料开展物理力学特性测试及耐候性试验,结果表明,该种配比的浆液结石体除具有孔隙率大、收缩小、强度好的特点外,还具有较好的抵御温湿度循环、冻融循环及盐碱侵蚀等的能力,是一种较为适宜的砂岩石窟裂隙灌浆材料。研究结果也可为类似石窟岩体裂隙灌浆材料的选择作参考。

Based on earlier experiences with Yangshao cement,we did preliminarily laboratory experiments that revealed that a grouting material consisting of hydraulic lime（ obtained from calcinated ginger nuts）,metakaolin and silica sand was ideal for treating the cracks developing in sandstone grottoes. Further research also showed that when the grouting material was mixed with 10% of swelling agent,the optimum mixture ratio of hydraulic lime,metakaolin,silica sand was 1∶ 0. 6∶ 0. 4 and ratio of water to cement was 0. 5 ~ 0. 6 ∶ 1. Physical,mechanical and durability tests on the grouting material were carried out. The results showed that the hardened grout not only had the merits of large porosity,weak shrinkage and suitable strength,but also had high temperature-humidity cycle resistance,freezing and thawing cycle resistance and a low rate of erosion by salt and alkali. The studied material is suitable for the grouting conservation of sandstone grottoes.