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International Concrete Abstracts Portal

Showing 1-5 of 160 Abstracts search results

Document: 

SP-330-02

Date: 

September 26, 2018

Author(s):

Zhenping Sun, Chao Chen, Yanliang Ji, Xu Yang, Yuansong Sun, and Lelin Wu

Publication:

Symposium Papers

Volume:

330

Abstract:

The objective of this study was to evaluate the influence of alkalinity on the properties and acceleration mechanism of the accelerated cement pastes. Properties of cement pastes relating to its setting time and the strength development as well as its hydration behavior were experimentally tested. XRD and SEM analysis were also performed on the cement pastes to identify the hydration products and their structures.

Results showed that with the increase of alkalinity, the hydration rate and the early compressive strength of cement paste with both alkaline and alkali–free accelerators were accelerated and the setting time was shortened. However, it is harmful for the long-term compressive strength. XRD analysis disclosed the existence of more ettringite with the increase of the alkalinity. However, it appeared no difference between the formation of the ettringite in the cement paste with different alkalinity.


Document: 

SP326-99

Date: 

August 10, 2018

Author(s):

Viktor V. Granev, Nikolay G. Kelasiev, Emil N. Kodysh, Nikolay N. Trekin, and Ivan A. Terekhov

Publication:

Symposium Papers

Volume:

326

Abstract:

The paper considers a structural concept for multistorey buildings with free floor plan and the new type of large-size load-bearing structures. The characteristic of the structural concept is that the main spatial reinforcing member for adjacent storeys in building is a steel truss.

Such approach makes it possible to organize large-span space through the floor and it can be used for different purposes, for example, for shopping area, ice or roller-skating rinks, open space offices.

The authors designed structural node connections including resting of floor slab on truss chords, as well as joining of steel truss to shotcrete filled rectangular tubes.

Parameters of the most cost-efficient cast-in-place floor slab by corrugated deck have been determined.


Document: 

SP310-04

Date: 

March 17, 2017

Author(s):

Christopher K. Y. Leung

Publication:

Symposium Papers

Volume:

310

Abstract:

Research and applications of fibre-reinforced concrete (FRC) started in China during the early 1970’s, and have grown substantially over the last few decades. The first design guideline for fibre-reinforced concrete structures was developed in 1992 and subsequently updated in 2004. The design guideline focuses on steel fibre concrete, which is most commonly used in practical applications, but also has provisions for the use of synthetic fibres. In this paper, a general overview of the guideline will be provided. The design concepts for both serviceability and ultimate states are presented first. Various applications covered in the guideline, including fibre-reinforced structural or semi-structural components, pavements, bridges, hydraulic structures, shotcrete (for tunnel and repair) as well as waterproofing will then be described. By providing a concise summary of the guideline, we hope to convey an idea about the current state of fibre-reinforced concrete design in China.


Document: 

SP310-02

Date: 

March 17, 2017

Author(s):

Barzin Mobasher

Publication:

Symposium Papers

Volume:

310

Abstract:

The ACI Committee 544 on fibre-reinforced concrete (FRC) has been involved in development and dissemination of technical information for nearly a half century. A key advantage in using FRC is the reduction in construction time compared to the traditional reinforcing bars or welded wire mesh. Application areas for FRC have extended to areas where high early strength and ductility are important and include pavement, shotcrete and structures such as bridge deck slabs, or rock slide stabilization. In these cases, the material properties must be measured using experimental test data obtained from an experimental program. Test results must be analysed in order to obtain effective stress strain responses that can be incorporated in analytical, or computer simulation. A list of examples including wall panels, hydraulic structures, airport pavements, and industrial floor overlays are described. To maintain integrity without collapse, such structural elements need to be designed with proper material models and analysis tools discussed.


Document: 

SP305-25

Date: 

September 1, 2015

Author(s):

Guido Bregoli; Andrea Madini Moretti; Marco Parolari; Paolo Riva and Marco Santicoli

Publication:

Symposium Papers

Volume:

305

Abstract:

The research aims at studying an innovative construction system (called S.E.Con. System1 - Sustainable Ecological Construction System) to realize sustainable buildings, having both acoustic and thermal high performance, in which the seismic-resistant structural elements are small reinforced concrete walls widely spread on the perimeter of the building and where all vertical structural and secondary elements (infill panels) are constructed using shotcrete. The results of experimental tests on a single story sample building and on structural walls, aimed to assess the structural, acoustic, and thermal insulation performances of the devised system, demonstrate that the system appears suitable for high seismicity areas, and that thermal and acoustic criteria set for passive constructions are met. Finally, an evaluation of the carbon footprint (CFP) has also been carried out, demonstrating a reduction of about 30% in the CFP of the construction system with respect to traditional construction systems.


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