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Sulphate attack and ettringite formation in the lime and cement stabilized marine clays

机译：石灰和水泥稳定的海洋粘土中的硫酸盐侵蚀和钙矾石形成

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Swelling and shrinkage behaviour of marine clays impose foundation problems that may sometimes results in excessive settlements. Improving the behaviour of soft clays using lime or cement is not new. Recent studies reported the occurrence of high swelling and pavement failures in lime and cement stabilized clays containing sulphates. The above phenomena resulted in the formation of swelling minerals such as ettringite and thaumasite. In this paper, the earlier reported case histories of sulphate attack in lime and cement stabilized clays have been reviewed, and a list of precautionary measures to be adopted for controlling the ettringite formation have been suggested. An attempt has been made to investigate the application of deep lime mixing technique in sulphate enriched marine clays. Physico-chemical and engineering properties of the lime treated clays containing ettringite have been examined. Test results indicate that lime and cement stabilization techniques should be cautiously approached in sulphate enriched clays.
机译：海洋粘土的膨胀和收缩行为会带来基础问题，有时可能会导致过度沉降。使用石灰或水泥来改善软粘土的行为并不是什么新鲜事。最近的研究报道了在含有硫酸盐的石灰和水泥稳定的粘土中高膨胀和路面破坏的发生。上述现象导致了诸如钙矾石和高岭土的膨胀矿物的形成。在本文中，已经回顾了较早报道的石灰和水泥稳定粘土中硫酸盐侵蚀的案例历史，并提出了用于控制钙矾石形成的预防措施清单。已经尝试研究深石灰混合技术在富含硫酸盐的海洋粘土中的应用。已经检查了含有钙矾石的石灰处理的粘土的物理化学和工程性质。测试结果表明，在富含硫酸盐的粘土中应谨慎采用石灰和水泥稳定技术。

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