Abstract
The paper aims at investigating the content of particles and minerals of soft clay soil in the Mekong Delta coastal provinces, southern Vietnam, as well as improving soil stability using inorganic adhesives, i.e.lime and cement-based stabilization. To study the composition of soft clay soil, a series of different laboratory methods were carried out and revealed various characteristics related to mineral composition, pH value, soluble salt content, and grain particle composition of soft clay soils. The results demonstrated five soil subtypes, namely high – saline soil (S2), low-saline soil (S1), acid sulfate soil (A), acid sulfate - saline soil (S-A), soil without salt andacid sulfate content (S0- A0). The soft clay soil (C) included 5 subtypes, which were C-S2, C-S1, C-A, C-AS, and C-S0-A0, whereas the soft sandy clay soil (SC) included three subtypes, namely SC-S2, SC- S1, and SC-S0-A0. Analysis of the above results showed that the high - saline soil, acid sulfate soil, and acid sulfate - saline soil are not suitable for lime and cement stabilization. This observation was illustrated by the initial experiment of cement – soil mixture properties.
Highlights
The Mekong Delta coastal province is a part of Mekong Delta, southern Vietnam
The results showed that these range values were 24-27% of clay, 29- 36% of silt and 38 - 47% of sand in the soft sandy clay
Clay minerals are respectively illite, kaolinite and montmorillonite; pH value range of 5.6 to 7.1; salt content is more than 1.0%, the upper of layer salt content is less than 1%; Organic content is less than 5%
Summary
The Mekong Delta coastal province is a part of Mekong Delta, southern Vietnam. The Mekong. The results of the soluble salt content showed that: - The high – saline soil and low – saline soil widely distributed in the Mekong Delta coastal provinces. This result can be explained by two reasons. The values of these two parameters in the mixed acid sulfate soil-cement sample were decreased by 57 to 65% in site 37 These results can be explained that the compressive strength of the soil-cement mixture was affected by pH value, organic content and salt content. If the salt content was higher than 1%, or pH value was lower than 5.5, or organic content was higher than 5%, and silt and clay content were high, the compressive strength and elastic modulus of the soil-cement mixture decreased. The soil-cement mixture of the type SC-A0-S0 in site 12 had the highest values of compressive strength and elastic modulus (Figure-3b)
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