Is sheer thenar dite attack impotent compared with cyclic conversion of thenardite-mirabilite mechanism in laboratory simulation tests?
Is sheer thenar dite attack impotent compared with cyclic conversion of thenardite-mirabilite mechanism in laboratory simulation tests?
复制标题
与实验室模拟测试中芒硝-芒硝机制的循环转换相比，纯粹的大鱼际攻击是否无能为力？
DOI：
10.1016/j.enggeo.2012.10.009
复制
发表时间：
2013
影响因子：
7.4
通讯作者：
Swe Yu and Chiaki T. Oguchi
中科院分区：
文献类型：
--
作者：
Roydor;Jean;Swe Yu and Chiaki T. Oguchi
在循环全浸试验的润湿阶段，芒硝的沉淀被广泛认为是硫酸钠的主要破坏机制。然而，我们假设芒硝的损害贡献在实验室测试中不能被忽视。为了验证这一假设，进行了一系列的实验室实验，使三种类型的岩石受到硫酸钠的侵蚀。为了明确地证明芒硝的效力，除了循环全浸泡测试之外，还在不同的环境条件下进行连续部分浸泡测试，其允许纯粹的芒硝沉淀或可逆的芒硝-芒硝转化。虽然岩石破裂只发生在浸泡过程中，结果清楚地表明，芒硝单独可以引起显着的损害，在两个循环的总浸泡和连续的部分浸泡试验。在大多数情况下，涉及芒硝沉淀的测试，然而，比纯粹的芒硝测试更具破坏性，无论类型的盐供应技术。在相同的浸泡时间和温度下，干燥温度的差异会影响损伤程度，即使在循环相转化的试验中，也会显示出芒硝的损伤贡献。本文还讨论了芒硝比芒硝破坏力大的原因以及试验时间对芒硝破坏力的影响。
The precipitation of mirabilite during the wetting stage of a cyclic total immersion test has widely been implicated as the main damage mechanism of sodium sulfate. We, however, hypothesized that the damage contribution from thenardite cannot be discounted in laboratory tests. To verify the supposition, a series of laboratory experiments was undertaken by subjecting three types of rocks to the sodium sulfate attack. To unambiguously demonstrate the potency of thenardite, in addition to cyclic total immersion tests, continuous partial immersion tests were also performed under different environmental conditions, which allowed either sheer thenardite precipitation or reversible thenardite–mirabilite conversion. Although rock breakdown occurred only during immersion, the results clearly indicated that thenardite alone could induce significant damage in both cyclic total immersion and continuous partial immersion tests. In most cases, tests that involved mirabilite precipitation, however, were more destructive than sheer thenardite tests, regardless of the type of salt supply technique. With the same duration and temperature of the immersion stage, the difference in drying temperature influenced the degree of damage, revealing the damage contribution from thenardite even in the tests with cyclic phase conversion. The reason why mirabilite is generally credited to be more destructive than thenardite and the effect of test duration on the damage potency of thenardite are also discussed.