Effects of Aging on the Dry Shrinkage Cracking of Lime Soils with Different Proportions

Jianwei Yue,Huijie Gao,Wenhao Li,Huicong Su,Xue Yang,Ying Chen,Yiang Zhang,Siyuan Wang,Limin Zhao

doi:10.3390/app12010145

Jianwei Yue, Huijie Gao + Show 7 more

Open Access

https://doi.org/10.3390/app12010145

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Abstract

In this study, the reasonable aging time of lime soils with different ratios was determined to investigate the effect of aging on the internal mechanism of the dry shrinkage cracking of lime soil. To this end, the effects of aging time, lime content, and particle size on the volume crack rate, expansion and shrinkage rate, particle size distribution, and pH were analyzed using a dry–wet cycle, screening, and pH tests. In addition, the changes in the particle structure of the samples and the formation of new substances were analyzed. The results revealed that the volume crack and expansion shrinkage rates of the sample initially decreased, and then stabilized with increasing aging time. In addition, the aging time of the sample increased with increasing lime content and particle size. Further, at the initial aging stage, the volume crack and expansion/shrinkage rates of the sample increased with increasing lime content and particle size. With an increase in the aging time, the pH increased and then decreased significantly to 0.57–1.1% at the reasonable aging time. These indicate that the pH exhibited a significant effect on the reasonable aging time, and this will provide useful insights for the restoration of lime soil sites.

Highlights

Lime soil, which is composed of lime, clay, quartz sand, and other materials, exhibits a compact structure, high strength, and good compatibility with ancient buildings [1,2,3,4].lime soil is used in the construction of existing sites [5,6,7,8,9,10]
The results revealed that an increase in the aging time of lime soil resulted in a change in the shape of Ca(OH)2 crystal from a prismatic to a plate shape, which resulted in an increase in the average crystal particle size [23]
This study investigated the effects of the aging time, lime content, and particle size on the sample volume crack rate, expansion and contraction rate, particle size distribution, and pH of lime soil samples using the dry–wet cycle, screening, and pH detection tests

Summary

Introduction

Lime soil is used in the construction of existing sites [5,6,7,8,9,10]. The remediation of lime soil sites does not require high mechanical properties, the susceptibility of insufficiently aged lime soil to hydration results in a reduction in its internal moisture, which results in dry shrinkage cracking [11,12,13,14]. The durability requirements of newly restored soil sites [17,18]. Reveal that the dry shrinkage cracking mechanism of lime soil is one of the key factors for analyzing the deterioration and disease prevention of soil sites.

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Conclusion