Key laboratory of soft soil engineering character and engineering environment of Tianjin

Tianjin, China

Key laboratory of soft soil engineering character and engineering environment of Tianjin

Tianjin, China
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Liu S.,Tianjin Chengjian University | Yang J.,Tianjin Chengjian University | Yang J.,Key Laboratory of Soft Soil Engineering Character and Engineering Environment of Tianjin | Wang Z.,China Railway 18th Bureau Group the 4th Engineering Company Ltd | And 3 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2015

Concrete self-healing performance at different concentrations of sodium sulfate solution were investigated. The mechanical property, crack width, phase composition and microstructure before and after the repairment of concrete crack were analyzed. The results show that concrete self-healing performance in sodium sulfate solution is much better than that in water. The 2% sodium sulfate solution exhibits the optimum concrete self-healing performance at the curing age of 60 days, when the maximum strength restoration ratio is 126.5%. The 6% sodium sulfate solution has the optimum concrete self-healing performance in the curing age of 28 d, and the strength restoration ratio reduces from the maximum value of 137.8% to 75.8% at the curing age of 60 d. The 4% sodium sulfate solution shows a proper self-healing performance. The amount and size of hydration products, such as ettringite, gypsum and C-S-H gel, increase with the increase of sodium sulfate solution concentration. Ettringite, which is wrapped in C-S-H gel, fills the crack and makes it healed. If the sodium sulfate solution concentration was in an inappropriate range, hydration products would gather and inflate, leading to the second crack. ©, 2015, Chinese Ceramic Society. All right reserved.


Yang A.-W.,Key laboratory of soft soil engineering character and engineering environment of Tianjin | Yang A.-W.,CAS Wuhan Institute of Rock and Soil Mechanics | Kong L.-W.,CAS Wuhan Institute of Rock and Soil Mechanics | Lu L.-Q.,Key laboratory of soft soil engineering character and engineering environment of Tianjin
Applied Mechanics and Materials | Year: 2013

Four kinds of tri-axial shear structural yield stress is studied by controlling the pre-test consolidate degree and draining condition during the test. The results showed that draining condition influenced the tri-axial shear structural yield stress. When under the UU condition, structural characteristics appeared not clearly; when consolidated before testing and un-drained during test, only the undisturbed soil performed the structural yield stress; when draining during testing, the undisturbed soil showed the increased structural yield stress while the remolded soil could form certain structure. The impact of the draining condition on the structural characteristics is incurred by the change of the internal structure, which means that the draining condition have changed the arrangement and connection of the soil particles, then changed the soil structural properties. © (2013) Trans Tech Publications, Switzerland.


Yang A.-W.,Key Laboratory of Soft Soil Engineering Character and Engineering Environment of Tianjin | Yang A.-W.,CAS Wuhan Institute of Rock and Soil Mechanics | Zhang Y.,Key Laboratory of Soft Soil Engineering Character and Engineering Environment of Tianjin
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

Creep characteristics considering the different initial consolidation degrees of dredger fill are studied by using triaxial rheometer TSS10. The results show that consolidation degree has an obvious influence on creep deformation of dredger fill. The creep deformation is more obvious when the consolidation degree is smaller. The increase of consolidation can reduce the creep deformation in a certain degree. The relationship among viscosity coefficient of the creep deformation, consolidation degree and effective consolidation stress substantially is a linearly increasing function. The creep damage strength increases with the increase of the consolidation degree, but is less than the instantaneous strength. The creep stress-strain isochronous curves under different consolidation degrees can be fitted by means of the hyperbolic function.


Yang A.,Key Laboratory of Soft Soil Engineering Character and Engineering Environment of Tianjin | Yang A.,CAS Wuhan Institute of Rock and Soil Mechanics | Zhang Y.,Key Laboratory of Soft Soil Engineering Character and Engineering Environment of Tianjin
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2014

To study the influence of stress path on the long-term deformation, creep tests of dredger fill in Tianjin Binhai New Area in three different stress paths, namely decrease p paths (DEP), constant p paths (CNP) and increase p paths (INP) respenctively, were carried out by using the WF stress paths tester and grading loading method. The results showed that under the same deviate stress conditions, the creep strain decreased in three kinds of stress paths of DEP, INP and CNP in turn, deformation rate of stable stage in the procession of creep increased according to the three kinds of stress paths of DEP, CNP, INP. The pore water pressure were negative in the procession of creep with decrease p and constant p stress paths, and decreased along with the deviate stress increase. However, in the procession of creep with increase p stress paths, the pore water pressure increased with the increase of deviator stress. The long-term strength in decrease p and constant p stress paths was higher than that in increase p stress paths. Finally, the effect is better by using quadratic polynomial to fit stress-strain isochronous curve of the three stress paths.


Yang A.-W.,Tianjin Institute of Urban Construction | Yang A.-W.,Tianjin University | Yang A.-W.,Key Laboratory of Soft Soil Engineering Character and Engineering Environment of Tianjin | Yan S.-W.,Tianjin University | And 8 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

Because of different compositions and depositional environments, the natures of dredger fills are different. In this paper, Tianjin marine soft soil is used as material to simulate site environment to study the strength growth in soft dredger fill. Experiments show that the different conditions of pressure and drainage affect the growth of soft dredger fill greatly. When conditions are conducive to the drainage of water in soil, the growth of strength is significant. The effect on soil strength growth by overburden pressure is through some possible drainage; when drainage conditions are bad, and the pressure increased, the strength grows slowly and little; on the contrary, it grows faster and absolute value is large.


Yang A.-W.,Tianjin University | Yang A.-W.,Tianjin Institute of Urban Construction | Yang A.-W.,Key Laboratory of Soft Soil Engineering Character and Engineering Environment of Tianjin | Yan S.-W.,Tianjin University | And 6 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

The engineering properties of Marine soft soil of Tianjin Binhai New Area is difficult to directly meet the requirements of construction, so need for appropriate treatment and disposal. The effect of solidification of soil-cement adding alkaline agent based on raw materials of Tianjin marine soft soil and analysis of filed verification test and microstructure are introduced. The results indicate that alkaline environment has a great role in improving the strength of cement-soil; and also can save the cost of project construction, it is worth to applying in project practice.

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