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Impact of NaCl on drying shrinkage behavior of low-plasticity soil in earthen heritages
- Source :
- Canadian Geotechnical Journal. 54:1762-1774
- Publication Year :
- 2017
- Publisher :
- Canadian Science Publishing, 2017.
-
Abstract
- Cracking of wall surface crusts on salt-laden earthen remains at the site of Yar City, northwest China, is a serious concern. This widespread pathology is closely related to the drying shrinkage behavior of soil and the fundamental mechanisms should be investigated to better interpret the deterioration of these precious heritages. In this paper, tests were conducted on specimens that were initially slurries with NaCl contents of 0%, 2%, and 5%. The soil shrinkage characteristic curve (SSCC) was measured using the fluid displacement method during a slow air-drying process. The drying branch of the soil-water retention curve was also established by combining three common techniques (pressure plate, vapor equilibrium, and filter paper). The microstructure of specimens with varying water and NaCl contents was characterized through mercury intrusion porosimetry (MIP) testing. Results show that NaCl had negligible impact on the SSCC, which was composed of three shrinkage zones. With increasing NaCl content, matric suction was hardly influenced while the total suction increased significantly due to the pore fluid osmotic suction. The analysis indicated that drying shrinkage was actually a process of consolidation governed predominantly by matric suction. MIP test results were consistent with the macroscale observations for specimens that were initially slurries: that the total volume of pores decreased upon drying. In addition, pore-size distribution was unimodal and no significant difference was observed among specimens with different NaCl contents.
- Subjects :
- Materials science
Pressure plate
0211 other engineering and technologies
04 agricultural and veterinary sciences
02 engineering and technology
Plasticity
Geotechnical Engineering and Engineering Geology
Microstructure
Cracking
040103 agronomy & agriculture
Slurry
0401 agriculture, forestry, and fisheries
Geotechnical engineering
Mercury intrusion porosimetry
021101 geological & geomatics engineering
Civil and Structural Engineering
Shrinkage
Subjects
Details
- ISSN :
- 12086010 and 00083674
- Volume :
- 54
- Database :
- OpenAIRE
- Journal :
- Canadian Geotechnical Journal
- Accession number :
- edsair.doi...........bc8e387ad225d089135b39854303d062