In coastal industrial zones with saturated loose soil, sulfate attack is an additional problem. The problem becomes more acute when using soil cement, because an undesirable sulfate content can enter the body of the element with the material used to create it. This research includes two parts. In the first part, the effects of internal and external sulfate attack are compared in simulation of four groups of elements: control, prefabricated, cast-in-place and soil–cement. In the second part, the effects of the sulfate-resistant cement content (100–400 kg/m3) and sulfate concentration (0–5%) on behavior of cement-stabilized sand specimens were examined. In both parts, the unconfined compressive strength of the cylindrical specimens was measured over the course of 362 days. The results of part one showed that internal attack had a significant effect on decreasing the strength of the soil–cement specimens (up to 70%) compared to prefabricated (about 40%) and cast-in-place (about 20%) specimens. The results of the second part showed a logarithmic trend in the variation of strength versus the cement factor and sulfate concentration over time.

中文翻译：

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硫酸钠对水泥土强度的内外影响

在具有饱和松散土壤的沿海工业区，硫酸盐侵蚀是一个额外的问题。使用土壤水泥时，问题变得更加严重，因为不希望有的硫酸盐含量会与用于制造它的材料一起进入元件的主体。本研究包括两部分。在第一部分，内部和外部硫酸盐侵蚀的影响在四组元素的模拟中进行了比较：对照、预制、现浇和水泥土。在第二部分中，研究了抗硫酸盐水泥含量（100-400 kg/m3）和硫酸盐浓度（0-5%）对水泥稳定砂试样行为的影响。在这两个部分中，在 362 天的过程中测量了圆柱形试样的无侧限抗压强度。第一部分的结果表明，与预制（约 40%）和现浇（约 20%）试样相比，内部侵蚀对降低水泥土试样的强度（高达 70%）有显着影响。第二部分的结果显示强度随时间随水泥系数和硫酸盐浓度的变化呈对数趋势。