砒砂岩火山灰活性及碱激发改性

发布时间：2018-04-17 00:28

本文选题：砒砂岩 + 火山灰活性　；参考：《硅酸盐学报》2015年08期

【摘要】：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。
[Abstract]:The effects of saturated lime water and different concentration of NaOH solution on the dissolution of Sio _ 2 / Al _ 2O _ 3 in arsenitic sandstone were studied by boiling method. The activity of soft rock was studied by the strength test of cemented sand, and the concentration of alkali solution, curing mode and curing age were taken as variables.The mechanical properties, product types and microstructure of arsenopyst modified materials were studied by means of X-ray diffraction Fourier infrared spectroscopy (FTIR) and scanning electron microscope (SEM).The feasibility of modifying arsenite into alkaline excitation material was discussed.The results show that the arsenic sandstone has a certain pozzolanic activity, and the alkali concentration has a significant effect on the dissolution rate of Sio _ 2O _ 2O _ 2O _ 3 in the soft rock. The higher the alkali concentration is, the greater the dissolution amount of Sio _ 2O _ 2O _ 2O _ 3 is, and the white is white to the NaOH solution with alkali concentration of 2mol/L.The dissolution rates of Sio _ 2 and Al _ 2O _ 3 in red arsenite can reach 31.7% and 32.93% respectively, the concentration of alkali solution, curing temperature and curing age have significant effects on the compressive strength of the modified materials, compared with the original rock of arsenopyrite.The compressive strength and water resistance of the modified materials were greatly improved. The results of 11.63MPa.FTIR and SEM-EDS showed that the reaction products of the modified materials were mainly amorphous calcium silicate cement.
【作者单位】：大连理工大学土木工程学院;水利部黄土高原水土流失过程与控制重点实验室大连理工大学材料工程研究中心;
【基金】：“十二五”国家科技支撑计划资助项目(2013BAC05B03) 大连市建设科技计划项目(201309)
【分类号】：TU521.2

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