Durability Characteristics of High Performance Shotcrete for Permanent Support of Large Size Underground Space
Durability Characteristics of High Performance Shotcrete for Permanent Support of Large Size Underground Space
复制标题
DOI：
10.4334/jkci.2007.19.6.701
复制
发表时间：
2007
影响因子：
--
通讯作者：
Jong-Pil Won;Hwang-Hee Kim;Chang-Il Jang;Sang-Woo Lee
中科院分区：
文献类型：
--
作者：
Jong-Pil Won;Hwang-Hee Kim;Chang-Il Jang;Sang-Woo Lee
本研究评估了高性能喷射混凝土的耐久性混合在适当的比例，使用无碱和水泥矿物速凝剂作为永久性的支持，保持其强度的长期。耐久性测试进行了氯离子渗透性，反复冻融，加速碳化，盐环境的影响。试验结果表明，含硅灰的喷射混凝土混合料均具有较低的渗透性。此外，经过300次冻融循环后，喷射混凝土混合物具有超过85%的相对动态弹性模量的优异抗冻融性。加速碳化试验结果不受速凝剂类型的影响，但含硅灰的喷射混凝土混合物的碳化深度更大。在盐环境中未观察到损坏。因此，本研究中使用的高性能喷射混凝土配合比显示出优异的耐久性。
This study evaluated the durability of high-performance shotcrete mixed in the proper proportions using alkali-free and cement mineral accelerators as a permanent support that maintains its strength for the long term. Durability tests were performed the chloride permeability, repeated freezing and thawing, accelerated carbonation, and the effects of salt environments. Test results showed that all the shotcrete mixes included silica fume had low permeability. In addition, after 300 freeze/thaw cycles, the shotcrete mix had excellent freeze/thaw resistance more than the 85% relative dynamic modulus of elasticity. The accelerated carbonation test results were no effect of accelerator type but, the depth of carbonation was greater in the shotcrete mix containing silica fume. No damage was seen in a salt environments. Therefore, the high performance shotcrete mix proportions used in this study showed excellent durability.