| 模拟酸雨对混凝土影响的研究 |
| 摘要点击 914 全文点击 1061 投稿时间：1995-02-16 |
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| 中文关键词 酸雨 混凝土 腐蚀 危害 |
| 英文关键词 acid rain concrete erosion damage |
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| 中文摘要 |
| 采用周期浸泡和喷淋试验等2种加速腐蚀试验方法,分别研究PH为1.0、3.5、5.6和PH为1.0、SO42-为0、0.06、0.1mol/L等6种模拟酸雨对混凝土的影响。研究表明:用矿渣水泥配制的混凝土较用普通硅酸盐水泥配制的混凝土耐酸雨能力强;酸雨中H+和SO42-的协同侵蚀导致混凝土强度的降低,其下降的程度与材料中CaO的损失和SO3/CaO的比值成二元线性相关;H+的渗透速度随时间的变化遵循幂函数的关系;混凝土受蚀后,[CaNa][SiAl]4O8、[NaK]AlSi3O8等将逐渐消失,而生成体积较大的CaAl2Si2O8、CaSO4·2H2O等物质,材料中的CaO、MgO、Al2O3和Fe2O3组分流失,其中的Fe2O3仅受酸雨中的H+的侵蚀而不受SO42-的影响,CaO和Al2O3既受H+的侵蚀又受SO42-的侵蚀影响。 |
| 英文摘要 |
| Two erosion-accelerating methods (periodical immersion and periodical spraying) were developed,and used to study the effects on concrete structures of simulated acid rains of different acidities and concentrations. The following conclusions were dlawn:as compared with the concrete made of portland cement,the concrete made of slag cement was more resistant to acid rainl the coordinate erosion of H+ and SO42- reduced the strength of concrete,and the reduction was as econdary linear function of both CaO loses andthe ratio of SO42-,content to CaO content; the penetration rate of H+ was an exponential function of time; the crystal structure and chemical composition changed in the process of erosion; substances such as [CaNa][SiAl]4O8,and [NaK]ALSt,O,were gradually replaced by more voluminoussubstances such as CaAl2Si2O8 and CaSO4·2H2O; the contents of CaO,MgO,Al2O3 and Fe2O3 became lower,and the losing of Fe2O3 was caused by the erosion of H+ other than while CaO and Al2O3 being eroded by both H+ and SO42-. |
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