Effect of partial substitution of raw gypsum with thermally treated phosphogypsum on the properties of Portland Pozzolanic Cement

M. Taher, Adele Amine, Bassam Khalaf Damarany
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引用次数: 3

Abstract

For many years of production of phosphate fertilizer very large amounts of phosphogypsum (PG) occupied large area, causing chemical and radiological environmental. Using of PG in building materials represents a good method for lowering the cost of cement production and dispose of phosphogypsum as chemical and radioactive waste. Fresh wet hemihydrate phosphogypsum, cement and pozzolana additive were mechanically activated together and from mixing Portland pozzolanic cement (PPC) with PG, these mixes were prepared at different replacements (by weight) of raw gypsum (RG)with purified PG ranging from 1–5% . The purified PG was obtained by calcining PG at temperatures of 200, 400, 600, 800 and 1000 ᵒC. The compressive strength, bulk density, total porosity, combined water and free lime of different hardened mortars were obtained following 3, 7, 28 and 90 days of curing. In addition, the setting time of cement pastes. The highest percentage increase in strength was found to be for PG calcined at temperatures of 800 and 1000 ᵒC. The incorporation of PG in the cement paste has dramatically increased its initial and final setting times. FTIR spectroscopic analysis and scanning electron microscopy (SEM) were used for investigate the change in structure of mortars after curing and change in morphology and microstructure of some hardened pastes.
热处理磷石膏部分替代生石膏对硅酸盐水泥性能的影响
多年来磷肥生产中大量的磷石膏(PG)占用面积大,造成化学和放射性环境污染。在建筑材料中使用磷石膏是降低水泥生产成本和处置磷石膏作为化学废物和放射性废物的好方法。将新鲜的半水磷石膏、水泥和灰火山灰添加剂一起进行机械活化,并将波特兰灰火山灰水泥(PPC)与PG混合,以1-5%不等的原料石膏(RG)的不同替代量(按重量计)制备这些混合物。分别在200、400、600、800和1000℃的温度下对PG进行煅烧,得到纯化的PG。分别在养护3、7、28和90 d时,测定不同硬化砂浆的抗压强度、容重、总孔隙率、结合水和游离石灰。另外,水泥浆体的凝结时间。在800和1000℃的温度下煅烧的PG的强度增加百分比最高。PG在水泥浆体中的掺入大大增加了水泥浆体的初凝和终凝时间。采用FTIR光谱分析和扫描电镜(SEM)研究了砂浆固化后的结构变化,以及一些硬化膏体的形貌和微观结构变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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