红砂岩改良试验研究

红砂岩岩性特殊，不能直接用于路基填料，因此，对红砂岩的性质及水泥改良进行了试验研究。结果表明:红砂岩岩体崩解质量损失与干湿循环次数呈二次曲线关系，首次干湿循环的崩解质量损失较大，随干湿循环次数的增加质量损失逐渐趋于稳定；风化后的红砂岩作为路基填料，除满足CBR要求外，同时还应保证无侧限抗压试件遇水后具有一定的强度；风化后红砂岩的黏聚力非常小甚至为零，通过添加水泥改良，其黏聚力与内摩擦角均增大，强度得到大大提高，表明水泥改良崩解红砂岩效果好。

Experimental Research on Improvement of Red Sandstone

The red sandstone has special characteristics, which cannot be used as the subgrade filler directly. Therefore, the properties of red sandstone and the improvement of cement are studied. The results disintegration quality loss and the drying and watering cycle index presents conic relationship. The disintegration quality loss of the first drying and watering cycle is greater and tend to stable gradually with the increase of drying and watering cycle index. The weathering red sandstone, as the subgrade filler, should not only to meet CBR requirements but also to ensure the unconfined compressive specimen have a certain strength after it has been under water; The weathering red sandstone’s cohesion is very small even zero. Through the improvement of cement, its cohesion and internal friction angle increase and the strength is greatly improved, showing that the cement improved disintegrated red sandstone obtains good effect.