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首页> 外文期刊>日本セラミックス協会学術論文誌 >Alteration depth and mechanical properties of hardened cement bodies attacked by sulfate ion
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Alteration depth and mechanical properties of hardened cement bodies attacked by sulfate ion

机译：硫酸盐离子侵蚀硬化水泥体的蚀变深度和力学性能

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It is well known that cementitious materials are determiorated by sulfate attack. Submerging tests of hardened cement paste and mortars were employed with sodium sulfate solution. The samples were prepared from ordinary portland cement and blast furnace slag cement. The test results showed that the sulfate ion migration was not governed by Fick's law. In the region of sulfate ion migrated, ettringite precipitated as a secondary product and the volume of capillary pores, in diameter of 18.3-212.5 nm, decreased. It was also observed that pores in diameter of 18.3-212.5 nm developed at areas where sulfate ion did not migrate. This should be considered as an important feature. In addition, secondary formation of gypsum was identified in the case of blast furnace slag cement. Compressive strength test and 3-point bending test were carried out to diagnose the mechanical performance against the sulfate ion ingress. Two types of alteration model were considered to evaluate the alteration depth and degree. Each model is working for the compressive test and the bending test, individually. We have proposed new indexes with these models. These indexes describe the alteration depth and degree, and closely relate to other indexes, such as sulfate ion migration depth and so on. According to these indexes, it seems that sulfate ion migration might cause filling of pore and generating of micro defect, alternatively, and progress the deterioration. This mechanism showed good agreement with apparent phenomena such as changes in profiles of sulfate ion and in strength.
机译：众所周知，胶结材料是通过硫酸盐侵蚀来确定的。用硫酸钠溶液对硬化的水泥浆和砂浆进行浸没测试。样品由普通硅酸盐水泥和高炉矿渣水泥制备。测试结果表明，硫酸根离子迁移不受菲克定律支配。在硫酸根离子迁移的区域中，钙矾石作为副产物沉淀，并且直径为18.3-212.5 nm的毛细孔体积减小。还观察到在硫酸根离子不迁移的区域形成了直径为18.3-212.5nm的孔。这应该被视为重要特征。另外，在高炉矿渣水泥的情况下，发现了石膏的二次形成。进行抗压强度测试和三点弯曲测试以诊断针对硫酸根离子进入的机械性能。考虑两种类型的变更模型来评估变更的深度和程度。每个模型分别用于压缩测试和弯曲测试。我们用这些模型提出了新的指标。这些指标描述了蚀变深度和程度，并与其他指标密切相关，例如硫酸盐离子迁移深度等。根据这些指标，看来硫酸根离子的迁移可能引起孔的填充和微缺陷的产生，并恶化。该机理与明显的现象如硫酸根离子的轮廓和强度的变化显示出良好的一致性。

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