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International Concrete Abstracts Portal

Showing 1-5 of 105 Abstracts search results

Document: 

SP-343_27

Date: 

October 1, 2020

Author(s):

Frazão, C.; Barros, J.; Bogas, A.; Pilakoutas, K.; de Sousa, C.M.

Publication:

Symposium Papers

Volume:

343

Abstract:

Steel fibres resulting from the industry of tyre recycling can be efficiently employed for the reinforcement of concrete structures. Recycled Steel Fibre Reinforced Concrete (RSFRC) is a promising candidate with technical, environmental and economic benefits for the development of ductile, high strength and durable structural elements. The heterogeneity of the geometry of each Recycled Steel Fibre (RSF) due to the recycling process of the tires, can provide a plurality of strengthening mechanisms to concrete that promote efficiency and durability, as long as the RSFRC composition is carefully adjusted to the presence of RSF. For assessing the potentialities of recycled steel fibres (RSF) as concrete reinforcement, an experimental program was performed in the present study by comparing the following properties of concrete reinforced with industrial steel fibres (ISF) and with RSF: compressive strength, modulus of elasticity, flexural strength, flexural toughness and indirect tensile strength. The obtained results suggest that RSF reinforcement can significantly reduce the brittle behaviour of concrete by improving its toughness and post-cracking resistance. For the adopted industrial and recycled fibres, the last ones have not presented inferior post-cracking strengthening performance than the first ones.


Document: 

SP-336_06

Date: 

December 11, 2019

Author(s):

Nariman J. Khalil and Georges Aouad

Publication:

Symposium Papers

Volume:

336

Abstract:

The results of an experimental investigation into the mechanical properties and durability of recycled and natural coarse aggregates concrete are reported. A total of thirty-six specimens were tested. The percentages of replacement of coarse aggregates with recycled aggregates in the concrete mixes were 0%, 50%, and 100%. The source of recycled aggregates in this study was the concrete specimens tested in the laboratory. These specimens were crushed and then sieved into medium aggregates (4.75-9.5 mm) [0.19-0.37 in.] and coarse aggregates (9.5-19mm) [0.37-0.75 in.]. The replacement of fine aggregates was not considered in this study. The properties of concrete mixes containing natural aggregates as control mix and those containing Recycled Concrete Aggregates (RCAs) have been studied, including fresh properties, mechanical properties and durability. The influence of saturation state of RCA (dried or saturated) on the properties of concretes of identical compositions has first been studied. The theoretical amount of absorbed water is added at the beginning of mixing. Durability performance of hardened concrete made with recycled aggregates as partial or full replacement of natural coarse aggregates is reported. Resistance to pure water and sulfate attack is investigated. The results show that a replacement ratio of 50% does not have a significant effect on the performance of recycled aggregate concrete mixes. Moreover, the recycled aggregate concrete performs relatively satisfactorily under various conditions and has a comparable durability to natural aggregate concrete if properly designed.


Document: 

SP334

Date: 

October 9, 2019

Author(s):

Moncef L. Nehdi

Publication:

Symposium Papers

Volume:

334

Abstract:

To improve the eco-efficiency and sustainability of concrete, the cement and concrete industry can exploit many byproducts in applications that could, in some cases, outperform conventional materials made with traditional ingredients. This Special Publication of the American Concrete Institute Committee 555 (Concrete with Recycled Materials) is a contribution towards improving the sustainability of concrete via using recycled materials, such as scrap tire rubber and tire steel wire fiber, GFRP waste, fluff, reclaimed asphalt pavements, recycled latex paint, and recycled concrete aggregate. Advancing knowledge in this area should introduce the use of recycled materials in concrete for applications never considered before, while achieving desirable performance criteria economically, without compromising the quality and long-term performance of the concrete civil infrastructure.


Document: 

SP-334-12

Date: 

September 30, 2019

Author(s):

A. Said and O. Quiroz

Publication:

Symposium Papers

Volume:

334

Abstract:

In the U.S. and around the world, large amounts of waste latex paint are generated annually, which creates a significant challenge in terms of disposal in an economic manner. Paint contains some chemicals that may be harmful to the environment if recycled as it contains volatile organic compounds. However, waste latex paint can be used to produce an economic latex-modified pervious concrete that is similar or superior to regular pervious concrete. Previous studies investigated recycling waste latex paint in concrete applications such as sidewalks. This study investigates the use of waste latex paint in producing pervious concrete and the effect of using different ratios of paint addition on the properties of the studied mixtures. The properties evaluated included physical, mechanical and hydraulic properties. Results show that while waste latex paint recycling in pervious concrete can slightly reduce its mechanical properties at 5% polymer to cement content, it can still be a viable option to prevent paint disposal in landfills.


Document: 

SP-334-05

Date: 

September 30, 2019

Author(s):

Fariborz M Tehrani, John Carreon, and Nathan Miller

Publication:

Symposium Papers

Volume:

334

Abstract:

Detailed experimental and analytical studies were carried to investigate the effect of recycled tire-derived aggregates (TDA) on ductility and toughness of lightweight aggregate (LWA) concrete specimens containing coarse expanded shale aggregates and fine mineral aggregates. Investigations covered six different concrete mix with various portions of LWA replaced by TDA. Mechanical properties of each mix, including compressive strength, splitting tensile strength, flexural strength, and modulus of elasticity were measured to obtain the optimum range of TDA to LWA ratio. Further, dynamic destructive tests were carried to highlight the performance of tire-derived lightweight aggregate concrete (TDLWAC) subjected to impact loads. Moreover, the post-peak behavior of these specimens was modeled using a linear elastic fracture mechanics relationship. The model successfully demonstrated the effect of TDA in the enhancement of cracking behavior of TDLWAC.


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