Effect of curing condition on air permeability coefficient measured by in-situ test method

2014 ◽  
pp. 1207-1214
Author(s):  
K Kawaai ◽  
I Ujike ◽  
S Kunikata ◽  
S Okazaki
Keyword(s):  
Permeability Coefficient ◽  
Air Permeability ◽  
Test Method ◽  
In Situ Test ◽  
Curing Condition

scholarly journals Design of a steady-state in situ test to determine the air permeability coefficient of covercrete

2019 ◽  
Vol 195 ◽  
pp. 671-681
Author(s):  
Kai Yang ◽  
Yaocheng Wang ◽  
Adrian Long ◽  
Changhui Yang ◽  
Song Mu ◽  
...  
Keyword(s):  
Steady State ◽  
Permeability Coefficient ◽  
Air Permeability ◽  
In Situ Test

scholarly journals Development of a new in situ test method to measure the air permeability of high performance concretes

2014 ◽  
Vol 64 ◽  
pp. 30-40 ◽  
Author(s):  
K. Yang ◽  
P.A.M. Basheer ◽  
Y. Bai ◽  
B.J. Magee ◽  
A.E. Long
Keyword(s):  
High Performance ◽  
Air Permeability ◽  
Test Method ◽  
In Situ Test

scholarly journals Study on Compaction Effect and Process of Reclaimed Soil of Nonmetallic Mines in Xinjiang, China

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Kaikai Wang ◽  
Zizhao Zhang ◽  
Guobin Tang ◽  
Xiaodong Tan ◽  
Qianli Lv ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Land Reclamation ◽  
Simulation Method ◽  
Test Method ◽  
Soil Thickness ◽  
In Situ Test ◽  
Factors Affecting ◽  
Reclaimed Soil ◽  
Different Thickness

Reclaimed soil is the key substrate for land reclamation and ecological restoration in the mine areas. The change of the density of reclaimed soil of the nonmetallic mines in Xinjiang during the land reclamation process was studied in this paper. Firstly, the in situ test method of static load was used to simulate the compaction of reclaimed soil with different thickness of overlying soil by different compaction times of mines reclamation machinery, and field in situ test compaction data were obtained. Then, the numerical simulation method was used to simulate the variation process of displacement and porosity at different depths for different thickness of the reclaimed soil under different compaction conditions. The numerical simulation and the in situ test results verified each other to acquire the compaction process and results of reclaimed soil under different compaction. The results showed that the numerical simulation results were consistent with the in situ test. The reclaimed soil thickness and compaction times were crucial factors affecting the compaction effect of the soil. The difference between the three times compaction and the uncompacted soil was obvious, and the effect of single compaction was weakened with the increase of compaction times. Under the same compaction action, the thicker the soil was, the less obvious the compaction effect would be. In the process of reclamation, the compaction effect of the surface part (at the depth of 10 cm) was visible, and the amount of compression and springback was larger. The research results can provide a reference to the land reclamation of nonmetallic mines in Xinjiang, China.

scholarly journals In Situ Test Research on Friction Resistance of Self-Anchored Test Pile

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Chi Chen ◽  
Hailong Ma ◽  
Bilian Yang
Keyword(s):  
Transfer Process ◽  
Load Transfer ◽  
Test Method ◽  
Hyperbolic Function ◽  
Function Model ◽  
In Situ Test ◽  
Testing Method ◽  
Pile Testing ◽  
Test Pile

The traditional static load test method has been considered as the most direct and reliable method to determine the bearing capacity of single pile, but it has some disadvantages, such as inconvenient operation, laborious test, high cost, and being time-consuming. In this paper, a new type of pile testing method, self-anchored pile testing method, was proposed, and the in situ test was carried out for the first time. This method allows the upper and lower piles to provide force to each other and does not occupy other construction spaces. It had the advantages of simple operation and being economical and practical. Based on the Q-w curve, axial force distribution curve, and hyperbolic function model of load transfer, this paper studied the evolution law of friction of self-anchored test pile and the load transfer process of self-anchored test pile. The results show that the load transfer process of self-anchored pile-soil interface can be divided into three stages: elastic, elastic-plastic, and limit state. The friction of the upper and lower piles starts from the bottom of each pile and then gradually increases. The soil around the upper and lower piles gradually undergoes nonlinear deformation and shear failure, and the pile soil reaches the yield state. By analyzing the hyperbolic function model of load transfer, it shows that the hyperbolic function model can be better applied to the self-anchored test pile, which has reference value for the selection of the function model of self-anchored test pile in the future.

Analysis for Forced Vibration Test on Proto-Type Pile Foundation in Tsip

2005 ◽  
Vol 21 (4) ◽  
pp. 267-275 ◽  
Author(s):  
Yung-Yen Ko ◽  
Huei-Chun Chu ◽  
Cheng-Hsing Chen
Keyword(s):  
Forced Vibration ◽  
Pile Foundation ◽  
High Speed ◽  
Test Method ◽  
High Speed Rail ◽  
In Situ Test ◽  
Vibration Tests ◽  
Foundation Type ◽  
Method Analysis

AbstractA series of forced vibration tests were conducted on a proto-type pile foundation which is built in the Tainan Science-Based Industrial Park and is modeled on the foundation type of Taiwan High Speed Rail. The test method, analysis procedure and results of test are briefly introduced in this paper. Besides, a finite element method by using the computer program ABAQUS is used to simulate the test. Results obtained are in good agreement with the results of in-situ test, and both are helpful for understanding the characteristics of the ground responses of the site and for identification of the soil-structure interaction of Taiwan High Speed Rail foundation system.

Evaluation of Reinforcement Effects for Earth Cliff of Jiaohe Ancient City

2012 ◽  
Vol 594-597 ◽  
pp. 1054-1060
Author(s):  
Yu Cheng Shi ◽  
Ai Guo Wang ◽  
Ren Dong Qiu ◽  
Ming Qing Hu ◽  
Heng Zhi Wang ◽  
...  
Keyword(s):  
Field Testing ◽  
Test Method ◽  
In Situ Test ◽  
Composite Method ◽  
Ancient City ◽  
Three Fissures ◽  
Different Characteristics

The author adopted an in-situ test method of artificial arthquake survey to evaluate reinforcement effects of fissure grouting for earth cliff of Jiaohe ancient city in China. Based on field testing results of three fissures with different characteristics, we compared previous earth cliffs with reinforcement ones by means of grouting. Analysis results show that it is feasible to reinforce cliff by means of the composite method reported by authors, which jointly applies the grouting of Polystyrene (PS) material and the anchoring technology for fissure earth-cliffs of Jiaohe ancient city. Meanwhile, the composite method of reinforcement could obviously improve the integral strength of potentially dangerous cliffs. This means PS material should be a safety media to apply into the reinforcement and the author’s method could be helpful to protect the ruins of Jiaohe ancient city.

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