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International Concrete Abstracts Portal

Showing 1-5 of 25 Abstracts search results

Document: 

SP326-54

Date: 

August 10, 2018

Author(s):

Viktor Mechtcherine

Publication:

Symposium Papers

Volume:

326

Abstract:

Textile-reinforced concrete (TRC) has great potential for application in structures exposed to severe mechanical or environmental loading. This article presents an overview of the current knowledge available on the durability of this composite and its components. An additional focus is centered on the protection of steel reinforcement, such as in the case of the strengthening or repair of RC structures using TRC. In doing this, the transport properties of TRC in the cracked state, its long-term tensile strength and strain capacity, and resistance to aggressive environments have been identified as critical parameters. Current knowledge indicates that TRC can exhibit over the long term high mechanical performance and favorable transport properties when cracked. While the superior resistance of TRC to aggressive environments is to be expected when compared to ordinary concrete, there is little information available on the effects of aggressive environments on the mechanical properties of the material. Since TRC is still a relatively new material, there is no information available on its long-term performance in the field. To be able to utilize the superior qualities of TRC fully, it will be necessary to develop a realistic and reliable performance-based durability design concept for structures made of or strengthened by TRC. This paper is an attempt to provide elements for such a framework.


Document: 

SP326-70

Date: 

August 10, 2018

Author(s):

Adriana Angelotti, Sonia Leva, Giulio Zani, and Marco di Prisco

Publication:

Symposium Papers

Volume:

326

Abstract:

Sustainability of cement-based construction components is becoming a key point of the structural design process, since the implementation of green strategies favors an overall reduction of economic and environmental impacts. In the framework of a regionally funded research project, an innovative multi-layered roof element for the retrofitting of existing industrial buildings was developed at Politecnico di Milano. The development followed a holistic approach focusing on two main levels: 1) the optimization of the transverse section, aimed at minimizing the employment of cementitious composites such as High Performances Fiber Reinforced Concrete (HPFRC) and Textile Reinforced Concrete (TRC) and 2) the improvement of the energy performances, through the selection of adequate insulating materials (polystyrene and glass foam were considered) and the design of Building-Integrated PhotoVoltaics (BIPV). In this paper, preliminary considerations pertaining to the sectional and structural behavior of a 2.5 × 5 m [8.2 × 16.4 ft.] secondary panel are followed by the numerical/experimental evaluation of the thermal transmittance U and the BIPV performances. In this regard, a small demo roofing system housing three full scale panels was monitored throughout two Summer weeks, leading to the assessment of photovoltaics Performance Ratios (PR) and effectiveness of the architectural integration.


Document: 

SP275-07

Date: 

March 1, 2011

Author(s):

D.A. Bournas and T.C. Triantafillou

Publication:

Symposium Papers

Volume:

275

Abstract:

The onset and evolution of bar buckling at the plastic hinge of old-type reinforced concrete (RC) columns confined with composite material [textile-reinforced mortar (TRM) and fiber-reinforced polymer (FRP)] jackets was investigated experimentally and analytically in this study. The interaction between composite jacket (or concrete cover, for unconfined concrete) and embedded longitudinal compression reinforcement at the onset and evolution of bar buckling was achieved through strain measurements of the compression reinforcement. Moreover, the implementation of a stress-strain confinement model, which relates lateral with axial strains, allowed the description and monitoring of the axial-lateral strain relationship at the base of the columns throughout the evolution of bar buckling. Finally, based on the aforementioned confinement model and on the experimental measurements, the post-buckling behaviour of columns was related with the stiffness of the jacket.

DOI:

10.14359/51682417


Document: 

SP260-08

Date: 

June 1, 2009

Author(s):

R. Mott, W. Brameshuber, I. Hartung, and K. Dilger

Publication:

Symposium Papers

Volume:

260

Abstract:

Within the framework of an AiF research project, production methods for the serial batch production of building elements made of textile reinforced concrete were examined. The research work comprised the manufacturing techniques of laminating, casting, spraying and spinning as well as combinations of these methods. In the beginning the main focus was directed on the production and manufacturing technique with the adjustment of fine grained concrete and fabrics to the respective production technique and the development of spacers. Afterwards building elements were manufactured applying selected production techniques to be able to examine the entire manufacturing process of the building elements. The entire manufacturing process included the choice of the suitable production technique, the design of the building elements, the pre-confectioning of the fabrics, the production of the building elements as well as their testing and the discussion of the results. This paper presents the results of the research work. At first the production methods are explained. Afterwards the entire manufacturing process is exemplarily described for the production of spun concrete tubes as well as for elements of an integrated formwork.

DOI:

10.14359/56628


Document: 

SP251-05

Date: 

March 1, 2008

Author(s):

B.-G. Kang, J. Hannawald and W. Brameshuber

Publication:

Symposium Papers

Volume:

251

Abstract:

The tensile load carrying behavior under cyclic loading of filaments made of alkali-resistant glass, which is the basic component of the textile reinforcement used for textile reinforced concrete, has been analyzed. Therefore, tensile tests under cyclic loading at four different stress levels were carried out. A damage accumulation, which led in some cases to a failure of the specimens during the cyclic loading, could be observed. This motivated to introduce a strength degradation model. A calibration of the model parameters on the experimental data was performed using an optimization method. A statistical analysis was carried out beforehand, to estimate the initial tensile strengths of the specimens, which were needed for the calibration.

DOI:

10.14359/20151


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