Konan K L, Peyratout C, Smith A, Bonnet J-P, Rossignol S, Oyetola S
ENSCI-GEMH, Ecole Nationale Supérieure de Céramique Industrielle, Groupe d'Etude des Matériaux Hétérogènes (EA3178), 47-73 avenue Albert Thomas, 87065 Limoges Cedex, France.
J Colloid Interface Sci. 2009 Nov 1;339(1):103-9. doi: 10.1016/j.jcis.2009.07.019. Epub 2009 Jul 14.
The surface adsorption of calcium hydroxide onto kaolin and metakaolin was investigated by monitoring with atomic emission spectroscopy and pH measurements the amounts of ions left in solution after exposing clays to calcium hydroxide solutions of various concentrations. Both clays adsorb calcium and hydroxyl ions but differently. Kaolin adsorbs calcium hydroxide not only at the edges of the clay particles but also onto the basal faces. The adsorbed hydrated calcium ions form a layer on the clay particle surfaces, preventing further dissolution of the clay mineral platelet. Metakaolin shows high pozzolanic activity, which provides the quick formation of hydrated phases at the interfaces between metakaolin and lime solutions. The nature of the hydration products has been investigated using X-ray diffraction (XRD) and differential thermal analysis (DTA). The most important hydrated phases like CSH (hydrated calcium silicate) and C(2)ASH(8) (gehlenite) have been identified.
通过用原子发射光谱法监测以及测量pH值，研究了不同浓度氢氧化钙溶液与高岭土和偏高岭土接触后溶液中剩余离子的量，以此来探究氢氧化钙在高岭土和偏高岭土上的表面吸附情况。两种黏土都能吸附钙和氢氧根离子，但方式不同。高岭土不仅在黏土颗粒边缘吸附氢氧化钙，还会在基面吸附。吸附的水合钙离子在黏土颗粒表面形成一层，阻止黏土矿物片层进一步溶解。偏高岭土具有较高的火山灰活性，这使得在偏高岭土与石灰溶液的界面处能快速形成水合相。已使用X射线衍射（XRD）和差热分析（DTA）研究了水合产物的性质。已鉴定出最重要的水合相，如CSH（水合硅酸钙）和C(2)ASH(8)（钙铝黄长石）。
