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首页> 外文期刊>Proceedings of the Institutuion Civil Engineers >Behaviour of lime-slag-treated clay
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Behaviour of lime-slag-treated clay

机译：石灰渣处理粘土的行为

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This paper describes the strength and microstructural behaviour of lime-slag-treated clay. The microstructure was investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the strength of the treated clay was measured using the unconfined compressive strength (UCS) test. Untreated clay was prepared in the laboratory by mixing commercially available kaolin and bentonite, while hydrated lime and ground granulated blastfurnace slag (ggbs) were used as binders. XRD analyses of lime-slag-treated clay showed the existence of numerous reaction products such as calcium silicate hydrate (C-S-H), calcium aluminium silicate hydrate (C-A-S-H), and hydrotalcite (HT), which facilitated the strength increment. For a fixed proportion of lime, the relative intensity of pozzolanic reaction products was found to increase with increasing slag content. Slag was found to be very active to promote the pozzolonic reaction with lime, as evidenced from the presence of crystalline reticular (C-S-H) and platy (C-A-S-H) cementitious products in the SEM images. The role of lime in the activation of slag was also seen to have an upper limit whereby excess proportions failed to provide significant additional benefit. The UCS of lime-slag-treated clay was found to be higher in comparison with lime or slag alone with the same replacement ratio. This was due to the formation of more crystalline cementitious products, which accelerated the bridging (cementation) effect between lime-slag and clay particles.
机译：本文描述了石灰渣处理粘土的强度和微观结构行为。使用X射线衍射（XRD）和扫描电子显微镜（SEM）研究了微观结构，并且使用无侧限抗压强度（UCS）测试测量了处理过的粘土的强度。通过混合市售高岭土和膨润土，在实验室中制备未处理的粘土，同时将熟石灰和磨碎的高炉矿渣（ggbs）用作粘合剂。石灰渣处理过的粘土的XRD分析表明，存在许多反应产物，例如水合硅酸钙（C-S-H），水合硅酸铝钙（C-A-S-H）和水滑石（HT），它们有助于强度增加。对于固定比例的石灰，火山灰反应产物的相对强度随炉渣含量的增加而增加。从SEM图像中发现晶状网状（C-S-H）和板状（C-A-S-H）胶结产物的存在可以证明，炉渣对促进与石灰的火山灰反应非常活跃。石灰在炉渣活化中的作用也被认为是一个上限，由此过量的比例不能提供明显的额外益处。发现石灰渣处理过的粘土的UCS比相同比例的石灰或渣高。这是由于形成了更多的结晶性胶结产物，从而加速了石灰渣和粘土颗粒之间的桥连（胶结）作用。

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