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砒砂岩火山灰活性及碱激发改性
作者:李长明 张婷婷 王立久 
单位:1. 大连理工大学土木工程学院  辽宁大连 116024  2. 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辽宁 大连116024 
关键词:砒砂岩 火山灰活性 改性材料 力学性能 微观结构 
分类号:TV41
出版年,卷(期):页码:2015,43(8):0-0
DOI:10.14062/j.issn.0454-5648.2015.08.00
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SiO2Al2O3 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(XRD)Fourier 红外光谱(FTIR)和扫描电镜(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改性材料的可行性。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SiO2Al2O3 溶出量有显著影响,碱浓度越高,SiO2Al2O3 溶出量越大,对碱浓度为2mol/L NaOH 溶液,白色、红色砒砂岩的SiO2Al2O3 溶出率分别可达31.7%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,90 天龄期试件抗压强度最高达11.63MPaFTIR 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。

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 The influence of NaOH concentration on the soluble contents of SiO2 and Al2O3 in Pisha sandstone was investigated by aboiling reflux mothed. The relationship between the mechanical strength of motar and Pisha sandstone activity was discussed. Inorder to investigate the feasibility of producing an alkali-activated material with Pisha sandstone via an alkali activation process, themechanical strength, the types of hydration products and microstructure of Pisha sandstone modified materials at different NaOHconcentrations, curing conditions and curing ages were analyzed by an electronic universal testing machine, X-ray diffractometer(XRD), Fourier Transform infrared spectroscope (FTIR) and scanning electron microscope (SEM) , respectively. The results showthat the soluble contents of SiO2 and Al2O3 increase and Pisha sandstone has an activity when the NaOH concentration increases, andfor white and red Pisha sandstone, the soluble contents of SiO2 and Al2O3 are 31.7% and 32.93%, respectively, when the NaOHconcentration is 2 mol/L. The mechanical properties of alkali-activated Pisha sandstone materials can be affected by the curingtemperature, alkaline concentration and curing age. The maximum compressive strength of specimens is 11.63 MPa. Compared toPisha sandstone, the compressive strength and water resistance of the Pisha sandstone modified materials were enhanced. The mainhydration reaction product of Pisha sandstone modified materials is an amorphous C-S-H gel.

基金项目:
“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)。
作者简介:
第一作者:李长明(1985—),男,硕士。 通信作者:张婷婷(1983—),女,讲师,硕士生导师。
参考文献:
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