Ca(OH)2降低膨胀土塑性指数和提高抗剪强度参数的作用

Mila Kusuma Wardani, P. Sari, Mafrita Refionasari
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引用次数: 0

摘要

膨胀土的设计容易因含水量的影响而发生体积变化。这使得在规划过程中有必要考虑土壤改良方法,以保持含水量的变化。其中一种方法包括化学稳定,通过添加水泥或石灰等材料来实现。在膨胀土中,稳定工作的目标是降低塑性指数和提高抗剪强度参数。因此,本研究重点研究了在泗水Lakarsantri膨胀土中添加熟石灰(Ca(OH)2)。采用含钙稳定材料在粘土中形成火山灰,增加了粘土的承载力参数,即抗剪强度的变化。在A点和B点取土,含水率分别为48.57%和35.12%,在一定养护时间内,Ca(OH)2的掺量为6% ~ 24%,塑性指标值bbb50 %。结果表明,在养护30 d时,土壤的塑性指数由很高变为中等,最佳百分比值为6%。A土30日龄土抗剪强度最佳值为(Ca(OH)2) 6%,黏聚力值为0.02 kg/cm2,内剪角为36°。B土在10日龄时获得的最佳抗剪强度(Ca(OH)2)为6%,黏聚力值为0.14 kg/cm2,内剪角为23.80°。因此,本研究结果表明,从黏聚力值得到的土体抗剪强度参数显示,随着Ca(OH)2的加入,黏聚力值减小,内剪切角增大。
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The Performance of Ca(OH)2 to Reduce the Plasticity Index and Increase the Shear Strength Parameter for Expansive Soil
The design on expansive soils can easily change in volume due to the influence of water content. This makes it necessary to consider soil improvement methods in the planning process to maintain the variation in the water content. One of these methods includes chemical stabilization, which is carried out by adding materials such as cement or lime. In expansive soils, stabilization efforts aim to reduce the plasticity index and increase the shear strength parameters. Therefore, this study focused on the addition of slaked lime (Ca(OH)2) to expansive soil in Lakarsantri, Surabaya. The stabilizing materials used contain calcium to form pozzolan in the clay and increase the bearing capacity parameter, which is variation in shear strength. The soil was taken at 2 points A and B with a different moisture content of 48.57% and 35.12%, as well as a high plasticity index value > 50% using a percentage (Ca(OH)2) of 6%-24% at a certain curing time. Based on the results, the plasticity index in the soil changed from very high to moderate with an optimum percentage value of 6% at 30 days of curing time. The optimum value of soil shear strength is (Ca(OH)2) 6% at 30 days of age in soil A, the cohesion value is 0.02 kg/cm2, and an internal shear angle of 36°. In soil B, the optimum shear strength obtained (Ca(OH)2) was 6% at the age of 10 days with a cohesion value of 0.14 kg/cm2 and an internal shear angle of 23.80°. Therefore, the results of this study show that the parameter of shear strength of the soil from the cohesion value showed that the cohesion value decreased with the addition of Ca(OH)2, while the internal shear angle increased.
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