JIA Jinsheng, LIU Zhongwei, ZHENG Cuiying, ZHAI Jie, WANG Yue and MA Fengling

Abstract: Cemented sand, Gravel and Rock (CSGR) has been developed as an environmentally friendly material in the practice of dam construction in China. Because the CSGR dam was mainly used in the river bed which was rich in natural sand and gravel, the popularization of the CSGR material was limited to a certain degree. For the river bed that lacks natural sand and gravel, artificial sand and gravel can be used to build the Cemented Artificial Sand and Gravel (CASR) dam. The parameters such as water binder ratio, cement dosage, fly ash content and sand rate are studied in the paper, the durability of materials and the design principle of dam section are discussed,and the comparison of dam type schemes is carried out. This research shows:(1) The simple crushing way of artificial sand aggregate, that is, the gravel could directly be smashed by single machine after one break in the hammer crusher. (2) Because the strength of natural aggregate was high,the grading was relatively stable. The intensity of the CASR material was quite uniform. The frost resistance property and impermeability of the CASR was higher than cemented natural sand, gravel and rock material. (3) After the comparison of CASR dam type in the permanent project of Naheng reservoir in Yunnan Province, it saved 10% investment compared with RCC Dam. The CASR dam type has expanded the alternative of damming materials, and provides a new type of dam for the dam construction on the river that has to natural sand and gravel.

Keywords: artificial sand and gravel; proportion; strength; durability; crushing