scholarly journals Experimental Studies on Bendable Concrete

Civil Engineering in the present days undergoes sea changes both in theory and practice. Smart materials, prefabricated structures, and architectural elements use of light weight materials and similar other activities are taking affront seat in the advancement of construction. One such advancement is bendable concrete in the civil engineering indutries. Our study is about fabrication and experimental investigation of this bendable concrete which is highly an advanced and sophisticated concrete technology. Only a few works are reported as of now as it is now a new technology. In view of this even a small amount of research work will assume much significance. In our project work we have adopted this new found technique. We have used the following materials to make the specimens. Metallic fibre mesh reinforced concrete slab  Plastic fibre reinforced concrete slab  Glass fibre reinforced concrete slab  Reinforced concrete slab for comparison purpose To demonstrate the superiority of bendable concrete, vis-a-vis reinforced concrete, reinforced and plain cement concrete slabs were also cast for comparison purposes.On testing and comparison with each one of Plastic Fibre embedded with concrete, Metallic Fibre embedded with concrete and Glass Fibre based bendable concrete it was found the superiority of strength identification vis-a- vis the conventional concrete strength. In fact the strength is much improved around the same time stupendous ductility is achieved. Further the four specimens tested gave very good performance characteristics of bendable concrete..

2012 ◽  
Vol 249-250 ◽  
pp. 1063-1068
Author(s):  
Qian Ma ◽  
Dan Wu ◽  
Xu Dong Shi ◽  
Xiu Gen Jiang

The influence of the structure parameters on the anti-impact performances of the reinforced concrete slab is studied in the article. The reinforced concrete model is established by using ANSYS 13.0/LS-DYNA and nonlinear finite element theory and the parameterized modeling is achieved. The results show that the increase of the thickness of the slab and the steel bar diameter result in the enhancement of impact resistant capability of the slab; a appropriate quantity of reinforcement is significant; Increasing the concrete strength has a distinct impact on the slab’s impact resistance when using relatively low strength concrete. However the influence becomes weak after the concrete strength comes to C60 and higher. The fruits are useful to the designing of reinforced concrete slabs.


Electro-chemical Chloride Extraction (ECE) is considered one of the most effective technique used to extract chloride ions from reinforced concrete structures. Effectiveness of using ECE depends on some important factors such as anode type, current intensity, extraction duration, type of rebar and chemical properties of concrete. On the other hand, ECE may cause some detrimental effects on some mechanical properties of concrete and steel such as a reduction in bond and compressive strengths of concrete, and embrittlement (i.e. reduction in ductility) ductility of reinforcing steel. The major aim of this research work was to investigate the effectiveness of ECE using locally available un-galvanized steel mesh with conductive cement paste anode as a new type of anode on a reinforced concrete slab as a structural element. The slab behavior before and after ECE was studied by determining compressive strength, water absorption rate, concrete chloride content and steel corrosion potential. The slab behavior was studied taken into consideration the established steel arrangement with spacing 20 cm between re-bars. Another aim of this research work was to investigate the effect of initial chloride content on chloride extraction efficiency by applying optimum current intensity and duration (3 A/m2 and 6 weeks) on cylinders with pure chloride content 0.4% and 0.8% (by weight of cement). Effectiveness of ECE with small initial chloride content 0.4% and 0.8% was compared with that of high initial chloride content (2.5%) in order to know if the initial chloride content is an important factor on ECE effectiveness or not.


The issues of designing a steel-reinforced concrete floor using bent steel profiles are considered. The steel-reinforced concrete flooring consists of a monolithic reinforced concrete slab arranged on a removable formwork, and steel bent profiles. The removable formwork during the concreting process rests on steel beams without additional mounting posts in the floor span. Steel beams accept the weight of the formwork and concrete during the pouring, working on bending. After concrete strengthening, they mainly work on stretching as part of composite steel-reinforced concrete structure. The article has identified the advantages and disadvantages of steel-reinforced concrete flooring with the use of light steel thin-walled bent profiles. Checking the strength of the beam at the concreting stage and evaluating the load-bearing capacity of the floor after the concrete strength is set confirm the performance of this structure. Using the regulatory methodology for SP 266.1325800.2016, the area of implementation of steel and concrete flooring with CFS beams and the nomenclature of applied steel beams have been established. For practical application of the presented design, it is recommended to conduct experimental and theoretical research and develop engineering methods.


2014 ◽  
Vol 64 ◽  
pp. 496-503 ◽  
Author(s):  
Pablo Pujadas ◽  
Ana Blanco ◽  
Sergio Cavalaro ◽  
Albert de la Fuente ◽  
Antonio Aguado

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