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本文提出了一种直接评价处理膨胀土最佳石灰含量的方法,做了50组超载膨胀试验,这些试样是用不同百分比的熟石灰处理过的,对其进行了相同的室内试验,确定了最佳石灰含量。试验的结果表明,石灰的掺加量达到2％最佳,超过此值就会对被处理土的膨胀特性产生相反的作用。石灰含量达到4％和6％,膨胀率就是未处理土的两倍,石灰含量为8％时,膨胀率是来处理土的1.75倍。发现随着固化时间的推移,特别是对石灰含量百分率很高的试样来说,使膨胀量减小。本文引入了称为石灰处理膨胀系数的新参数,用来表征石灰处理的效果。发现石灰含量为1％时体积变化和膨胀压力最小,远远小于通常根据稠度指数、pH值和无侧限抗压强度试验求得的石灰含量4％到6％之间的体积变化和膨胀压力。
This paper proposes a method for direct evaluation of optimal lime content in expansive soils. 50 sets of overload expansion tests were performed. These samples were treated with different percentages of slaked lime. The same laboratory tests were conducted to determine the maximum Good lime content. The results of the test show that the best amount of lime is 2%. Exceeding this value will have an opposite effect on the expansion characteristics of the treated soil. The lime content reaches 4% and 6%, the expansion rate is twice that of the untreated soil, and when the lime content is 8%, the expansion rate is 1.75 times that of the treated soil. It was found that with the passage of the curing time, especially for samples with a high percentage of lime content, the amount of swelling was reduced. This article introduced a new parameter called lime treatment expansion coefficient to characterize the effect of lime treatment. It was found that volume change and swelling pressure were the minimum when the lime content was 1%, which was far less than the volume change and expansion pressure between 4% and 6% of the lime content usually obtained from consistency index, pH value and unconfined compressive strength test. .