ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

Showing 1-5 of 9 Abstracts search results

Document: 

SP299

Date: 

March 9, 2015

Publication:

Symposium Papers

Volume:

299

Abstract:

Editors: Corina-Maria Aldea and Mahmut Ekenel

This CD contains 8 papers from sessions sponsored by ACI technical committees 544, 549, and 130 at the Fall 2012 ACI Convention in Toronto and two technical sessions at the Fall 2013 ACI Convention in Phoenix. The topics of the papers cover sustainability aspects of using fiber reinforced concrete ranging from durability and interface mechanisms of natural fiber reinforced concrete (FRC), evaluation of eco-mechanical performance of FRC, reducing carbon dioxide emissions of concrete, as well as applications of fiber reinforcement for self-consolidating concrete, bridge link slabs, extruded prefabricated elements, slab systems and fabric-reinforced cementitious matrix systems for strengthening unreinforced masonry walls.

Note: The individual papers are also available. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP-299


Document: 

SP299-05

Date: 

January 1, 2015

Author(s):

B. Y. Pekmezci

Publication:

Symposium Papers

Volume:

299

Abstract:

This research investigated as a sustainable production technique, the application of calender extrusion in the production of cement fiberboards. Use of the technique was successful for the production of non-structural building elements. The properties of the produced composites are discussed in this paper. Glass, polyvinyl alcohol (PVA), and polypropylene (PP) fibers were used. The research involved an experiment to examine the mechanical properties and microstructure of the composites. The experimental results showed that calender extrusion may be a promising method for sustainable production of thin and wide cement composites. Various forms of cement composites can be produced with this method as well. Results indicate that the mechanical properties of cement composites produced with this method are dependent on the processing direction. Processed composites have adequate screw head pull-through and freeze-thaw resistance. Higher MOR values were obtained for water cured specimens compared to air cured ones.


Document: 

SP299-06

Date: 

January 1, 2015

Author(s):

Saman Babaeidarabad and Antonio Nanni

Publication:

Symposium Papers

Volume:

299

Abstract:

Un-reinforced masonry (URM) walls have proven to have low shear strength to withstand in-plane loads caused by earthquakes. Retrofitting masonry walls with novel materials such as fiber-reinforced composites has shown to increase the in-plane shear capacity of the walls and minimize damage by enhancing pseudo-ductility. In this study, a new fabric-reinforced cementitious matrix (FRCM) composite system is applied to URM walls to determine its feasibility as an externally-bonded retrofitting technique. The experimental program consists of testing under diagonal compression a total of 18 wall specimens, made from clay bricks and concrete blocks with two FRCM strengthening reinforcement schemes (one and four plies fabric). The experimental results demonstrate the effectiveness of FRCM strengthening on improving the shear capacity of masonry walls. Experimental data from other research programs using fiber reinforced polymer (FRP) composites are presented to demonstrate that when the normalized shear capacity is related to a calibrated reinforcement ratio, the two technologies show similar enhancements.


Document: 

SP299-01

Date: 

January 1, 2015

Author(s):

Flávio de Andrade Silva, João de Almeida Melo Filho, Saulo Rocha Ferreira and Romildo Dias Toledo Filho

Publication:

Symposium Papers

Volume:

299

Abstract:

The durability performance and interface transition zone of natural fiber reinforced concrete has always been a major concern. Natural fibers due to its hydrophilic nature present a high volume variation which may cause degradation in the fiber-matrix interface. Furthermore, natural FRC may undergo an enhanced aging process, while submitted to a humid environment during which they may suffer a reduction in ultimate strength and toughness. This paper presents how the use of a matrix with low content of calcium hydroxide can mitigate the embrittlement process of natural fibers. The durability performance of the composite systems is examined and the mechanisms for the significant delay in the fiber degradation when the total amount of calcium hydroxide is reduced from the matrix discussed. Furthermore, it is shown how the repeated wetting and drying cycles affects the fiber-matrix interface. Pull-out tests were performed in sisal fiber cement composite systems to study the mechanisms that influence the fiber-matrix bond. The results showed that the use of a matrix with low amount of calcium hydroxide improved the composite durability and that the wetting and drying process reduced the water absorption capacity of the fiber and increased the fiber-matrix bond.


Document: 

SP299-03

Date: 

January 1, 2015

Author(s):

Alessandro P. Fantilli, and Bernardino Chiaia

Publication:

Symposium Papers

Volume:

299

Abstract:

A comparison among different structural concretes is herein performed in order to select, or tailor, new eco-friendly and high performance cement-based composites. The ecological impact and the mechanical behavior of reinforced concrete (RC) ties and beams are both assessed by of means the so-called eco-mechanical index (EMI). The crack width of RC structures, the embodied energy and the carbon dioxide released by the production of concretes, are the main parameters of EMI. As a result, the best eco-mechanical performances can be easily achieved by using a normal strength cementitiuos concrete having high fracture toughness (i.e., by adding steel fibers to normal strength concrete). Moreover, in an eco-mechanical analysis, the work of fracture, either in tension or in bending, is sufficient to define the mechanical performances and durability of normal and high-strength of RC structures, without measuring crack width.


12

Results Per Page 




Please enter this 5 digit unlock code on the web page.