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Clinkerless Cement Produced from Flue Gas Desulphurization Residues and Fly Ash

机译：从烟道气脱硫残留物和粉煤灰产生的无酸式水泥

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Based on the results the following conclusions were made:1.By reducing the amount of spent bed ash in the“Clinkerless”cements,expansionwas reduced.However,a sufficient quantity of lime must be present in thecementing system to form ettringite and other hydrates to give the systemsufficient strength.2.The expansion of the“Clinkerless”cement blends was caused by the formationof ettringite in the presence of excess calcium hydroxide and water.The systemstopped expanding when the quantity of calcium hydroxide was below detectionlimits.3.By introducing hemihydrate to the FBC/UFA mixtures,expansion was reducedup to 90%.Most importantly,the mortar specimen prepared using the cementblends that contained 50%hemihydrate(with a water reducing admixture)achieved a compressive strength of approximately 1500 PSI(10.3 MPa)withinseveral hours and did not crack throughout the experiment duration.4.Sealed-curing of the 100%by-product cement blends increased compressivestrength and decreased expansion compared to traditional moist-curing.Thereduction in expansion was attributed to free water being kept out of the systemand thus minimizing colloidal ettringite formation.Mortar specimens thatcontained a water-repelling admixture and that were moist-cured behaved similarto specimens that were cured in plastic bags.
机译：基于结果，结论以下结论：1。减少了“无氟化物”水泥中的花床灰量，扩增减少。然而，必须存在足够量的石灰，以形成Ettringite和其他水合物。提供系统放度.2。“无酸”水泥共混物的膨胀是由Ettringite在过量的氢氧化钙和水存在下形成的。当氢氧化钙的量低于检测氧化物时，膨胀率为3.引入半水合物对于FBC / UFA混合物，膨胀将缩减为90％。最重要的是，使用含有50％半水合物（排水混合物）的水泥细胞制备的砂浆样本达到了约1500psi（10.3MPa）的抗压强度。并且在整个实验期间没有破解.4.一种100％副产物水泥混合物的安全性增加，膨胀率增加了增加和减少传统湿润固化。膨胀中的表达归因于自由水被远离系统，从而最小化胶体Ettringite地层。本样本的样本被沉浸在塑料袋中固化的湿固化。 。

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