摘要
采用碳酸钠、硫酸钠、硅酸钠、氯化钙、甲酸钙来提升Ca(OH)2-Mg(OH)2复合碱激发矿渣/粉煤灰体系(CMSF)的力学强度,通过X射线衍射、热重分析以及扫描电镜分析了材料的微观产物及结构.结果表明,与空白对照组相比,当碳酸钠掺量为8％时,CMSF各龄期抗压强度提高了 80％左右;当硫酸钠掺量为4％时,CMSF的3、7 d抗压强度分别提高了 79％和90％;当硅酸钠掺量为10％时,CMSF的3、7、28 d抗压强度分别提高了 195％、329％、215％:当氯化钙掺量为10％时,CMSF的3、7、28 d抗压强度分别提高了 375％、402％、248％;当甲酸钙掺量为2％时,CMSF的3、7、28 d抗压强度分别提高了 312％、354％、233％.外加组分会促进C-(A)-S-H凝胶的形成,使微观结构更加致密.
Abstract
Effects of sodium carbonate,sodium sulfate,sodium silicate,calcium chloride,and calcium formate on the mechanical strength of the Ca(OH)2-Mg(OH)2 composite alkali activated slag/fly ash system was studied.The micro-products and structure of the materials were analyzed by X-ray diffraction,thermogravimetric analysis,and scanning electron microscopy.The results showed that compared with the control group without additive,when the sodium carbonate content was 8％,the compressive strength of CMSF at various ages increased by about 80％;When the dosage of sodium sulfate is 4％,the compressive strength of CMSF at 3 and 7 days increased by 79％and 90％,respectively;When the dosage of sodium silicate is 10％,the compressive strength of CMSF at 3,7,and 28 days increased by 195％,329％,and 215％,respectively;When the content of calcium chloride is 10％,the compressive strength of CMSF at 3,7,and 28 days increased by 375％,402％,and 248％,respectively;When the content of calcium formate is 2％,the compressive strength of CMSF at 3,7,and 28 days increased by 312％,354％,and 233％,respectively.Micro-scopic analysis shows that additives can promote the formation of C-(A)-S-H gel,and make the microstructure tend to densify.
维普
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