石灰、水玻璃改良粉土的试验研究

Experimental study on lime and sodium silicate to improve silt

通过对泰州地区低液限粉土进行室内改良试验,研究石灰和石灰+水玻璃作为改良剂对该地区粉土的改良效果。研究发现:石灰改良土的最大干密度小于素土的最大干密度,且随着石灰掺量的增加最大干密度先增大后减小,最优含水率与素土基本相同,增加石灰掺量能有效提高粉土的强度,当石灰石掺量增加到一定程度时,压实度对石灰改良土强度的影响程度减弱,随着龄期的增加石灰改良土强度明显增长;石灰+水玻璃改良土的最大干密度和最优含水率随着改良剂掺量的变化基本不变,其强度远远大于素土强度,随着压实度的提高改良土的强度增加不明显,随着龄期的增加,改良土强度增长不明显;在石灰掺量不变的情况下,改良土的CBR值随水玻璃掺量的增加明显增大。

An improvement effect of low liquid limit silt, which used lime and lime + sodium silicate as ameliorant, has been studied based on laboratory improvement tests. It has been discovered that the maximum dry density of lime-improved soil is less than that of pure soil, and increases at first then decreases with the increasing of lime dosage. The optimum moisture content of lime-improved soil and pure soil are basically same. The increasing of slaked lime dosage is advantage to the improvement of the strength of silt, while the impact of compactness weakens as the increasing to a certain extent and strength of lime-improved soil enhances obviously with the increasing of age. The maximum dry density of slaked lime + sodium silicate improved soil is not affected by the change of dosage as well as the optimum moisture content. The strength of slaked lime +sodium silicate improved soil, which enhances not obviously with the improvement of compactness and the increasing of age, is much higher than that of pure soil. When the lime dosage is not changed, the CBR values of improved soil enhance obviously with the increasing of sodium silicate dosage.