Laboratory test on strength deterioration process of soil cement in seawater environment
Yan Nan1,2 Yang Junjie1,2 Liu Qiang3 Dong Mengrong1,2
1. The Key Laboratory of Marine Environment and Ecology of the Ministry of Education, Ocean University of China, Qingdao 266100, China;
2. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;
3. Shandong University of Science and Technology, Qingdao 266590, China
Abstract：The natural seawater was used as the corrosive medium to simulate the marine soft sites, and the micro-penetration test, the spectrum analysis (EDS), the X-ray diffraction (XRD) and the chemical tests were conducted to study the spatial and temporal distribution and the strength deterioration process of cement soil formed in the marine soft sites. The cement soil specimen can be divided into the deteriorated layer and the non-deteriorated layer. The results indicate that the deterioration depth increases with time and the cement mixing ratio. The maximum deterioration depth appeared at 360 days with the 8.7mm amplitude. Compared with the non-deteriorated layer, the micro-structural porosities are more and larger in the deteriorated layer, while the hydration products of the cement are less in the deteriorated layer. The pH and the Ca2+ concentration of cement soil both rise, while the concentrations of Mg2+, SO2-4 and Cl- decrease with the sample depth and the cement ratio. The variation of cement soil strength is consistent with the distribution of Ca2+ concentration along the penetration depth. Under the test conditions, the deterioration of cement soil is due to the combined action of the inhibiting strength increase and the promoting strength attenuation of cement soil. The Ca leaches in the form of ion and leads to the deterioration finally.
闫楠 杨俊杰 刘强 董猛荣 . 海水环境下水泥土强度衰减过程室内试验研究[J]. 土木工程学报, 2017, 50(11): 115-124.
Yan Nan Yang Junjie Liu Qiang Dong Mengrong. Laboratory test on strength deterioration process of soil cement in seawater environment. 土木工程学报, 2017, 50(11): 115-124.
