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采用沸煮法,研究了饱和石灰水和不同浓度NaOH溶液对砒砂岩中SiO2、Al2O3溶出量的影响,通过胶砂强度试验对砒砂岩活性进行了探讨,并以碱溶液浓度、养护方式和养护龄期为变量,通过强度测试、X射线衍射、Fourier红外光谱(FTIR)和扫描电子显微镜(SEM)等手段,对砒砂岩改性材料的力学性能、产物类型和微观结构进行了研究,探讨了将砒砂岩改性为碱激发材料的可行性。结果表明:砒砂岩具有一定的火山灰活性,碱浓度对砒砂岩中SiO2、Al2O3溶出量有显著影响,碱浓度越高,SiO2、Al2O3溶出量越大,对碱浓度为2mol/L的NaOH溶液,白色、红色砒砂岩的SiO2、Al2O3溶出率分别可达31.7%和32.93%;碱溶液浓度、养护温度、养护龄期对改性材料的抗压强度有显著影响,相对砒砂岩原岩,改性材料的抗压强度和耐水性均有较大提高,90d龄期试件抗压强度最高达11.63MPa。FTIR和SEM-EDS结果表明,改性材料的反应产物主要为无定型水化硅酸钙类胶凝物质。
The effects of saturated limewater and different concentrations of NaOH solution on the dissolution of SiO2 and Al2O3 in sandstone were studied by boiling method. The activity of sandstone was studied by mortar strength test. The effects of alkali solution concentration, curing method and curing Age as variables, the mechanical properties, product type and microstructure of 砒 sandstone modified materials were studied by means of intensity test, X-ray diffraction, Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) Feasibility of modifying 砒 sandstone to alkali-activated material. The results show that: 砒 sandstone has a certain volcanic ash activity, the alkali concentration has a significant impact on the dissolution of SiO 2 and Al 2 O 3 in the 砒 sandstone. The higher the alkali concentration, the greater the dissolution of SiO 2 and Al 2 O 3. The dissolution rates of SiO2 and Al2O3 for the white and red 砒 sandstone are up to 31.7% and 32.93% respectively. The alkali solution concentration, curing temperature and curing age have significant effect on the compressive strength of the modified material, The compressive strength and water resistance of the materials are greatly improved, the compressive strength of the specimens aged 90d up to 11.63MPa. FTIR and SEM-EDS results show that the reaction products of the modified materials are mainly amorphous calcium silicate cementitious material.