粉煤灰的压实  

Compaction characteristics of fly ash

作　　者：蔡红[1] 温彦锋[1] 边京红[1] 魏迎奇[1] 

机构地区：[1]中国水利水电科学研究院岩土工程研究所,北京100044

出　　处：《中国水利水电科学研究院学报》2006年第3期236-239,共4页Journal of China Institute of Water Resources and Hydropower Research

摘　　要：粉煤灰的主要粒径组成是粉土粒，其压实设计方法需击实法和相对密度法并用，并取其中要求高的密度作为设计填筑密度。本文通过大量的粉煤灰击实试验和相对密度试验，分析了试验方法对设计密度的影响。同时，与粉煤灰现场碾压试验进行了对比，其结果显示，碾压灰很难达到0．95倍的最大击实干密度，或者0．65～0．75的相对密度。碾压灰的高设计干密度给施工带来一定的难度，从室内试验结果看0．87倍最大干密度的压实灰体同样具有良好的力学性质，因此，认为实际应用中粉煤灰的压实系数可以低于土壤的压实系数。The majority of fly ash particles is silt. It is required for designing compaction density in the field to have both testing results from the relative density test and the Proctor compaction tests. If both tests are carried out, the higher density of the two tests is always selected as the field compaction density. This paper presents testing results on a wide range of fly ash, after analyzing the effects of test methods on the resulted density. Field compaction test results reveal that it is hard to compact it to have its dry density equal to 0.95 of the maximum value, or make its relative density equal to 0.65 ～ 0.75. As a result, the required compaction density always becomes impractical in practice. Laboratory test results show that fly ash having 87% of the maximum dry density already possesses quite good mechanical properties. Therefore, a lower degree of compaction can be recommended in determining the required field compaction density.

关 键 词：粉煤灰 击实试验 相对密度试验 填筑密度 

分 类 号：TV42[水利工程—水工结构工程]