scholarly journals Evaluation of Concrete Material Properties for Pavement Using Job-site Processed Recycled Aggregates

2013 ◽  
Vol 15 (2) ◽  
pp. 57-63
Author(s):  
Sungchul Yang ◽  
Namho Kim
2012 ◽  
Vol 503-504 ◽  
pp. 473-476
Author(s):  
Yan Liu ◽  
Zhi Gang Luo ◽  
Jie Cao

This article develops one new test technology, dumbbell test method, for evaluation of the early age cracking property of Concrete Material under constraint conditions. Its exercise of stress risers could lead concrete to crack quickly, providing a quick method to evaluate the early age crack performance of concrete material and to perform simulated test at job site conveniently. By this method, the anti-cracking performance of different concrete material can be evaluated quickly in the construction site.


2018 ◽  
Vol 45 ◽  
pp. 00116
Author(s):  
Jacek Szulej ◽  
Paweł Ogrodnik

In the paper it was decided to recognize the material characteristics of concrete based on ceramic aggregate, aluminous cement with the addition of zeolite (5%, 10%, 15%) and air entraining admixture. Aggregate crushed to 2 fractions was used for designing the concrete mix : 0-4 mm, and 4-8 mm. The research involved the use of clinoptilolite derived from the zeolite tuff deposit at Sokyrnytsya (Transcarpathia, Ukraine). The dominant component in the zeolite is clinoptilolite in an amount of about 75%. The research carried out by the authors showed that the addition of zeolite, among others, increases the compressive strength of concrete, significantly improves the frost resistance, which in the case of using only aluminous cement is very low. The obtained results confirm the possibility of using the above-mentioned components, which improve the concrete material properties and are environmentally friendly.


2011 ◽  
Vol 94-96 ◽  
pp. 1115-1119
Author(s):  
Xue Ying Yang ◽  
Yuan Mei Li ◽  
Wen Tao Dong ◽  
Bo Zhang

The equation to determine the neutral axis of concrete filled steel tube(CFST) component with round section is presented in this paper. The geometric equation, physical equation and static equilibrium equation of CFST are analyzed to determine its section neutral axis. The compressed mechanical properties of CFST component are analyzed with the concrete material properties divided into tension and compression parts.Comparing the numerical results with the experimental results it can be verified that the equation to determine the neutral axis of CFST component with round section is useful to solve the problems that the tension and compression material properties of concrete are different.


2016 ◽  
Vol 9 (3) ◽  
pp. 471-483
Author(s):  
M. F. L. O. Santos ◽  
B. Horowitz

ABSTRACT In forward cantilever structures, segments are built from previous ones, therefore construction loads must be carried by the partly completed structure. As the cantilever is moved forward deformations increase and corrections must be made during the construction phase. In camber control, corrective displacements are applied to compensate for deformations. The proposed procedure assimilates topographical survey data collected at each construction stage to update the structural model by minimizing the differences between real and computed displacements. Concrete material properties are used as design variables in an optimization process that drives them to values that better represent the material actually used in construction. This is an iterative process where new data are assimilated at each new structural deformed configuration. New camber values are computed and applied to segments that will be cast in the future in order to reach the desired final design profile. The use of the procedure leads to residual displacements of no greater than 5% of the total deformation without camber.


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