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Home > Publications > 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.
Showing 1-5 of 27 Abstracts search results
Document:
SP303-25
Date:
June 1, 2015
Author(s):
Aliakbar Ramezanianpour, Ehsan Jahangiri, Babak Ahmadi, and Faramarz Moodi
Publication:
Symposium Papers
Volume:
303
Abstract:
Durability based design of RC structures has gained great significance in recent decades and various mathematical models have been proposed. One of the famous models was proposed by fib. The effect of local conditions on the prediction of the models is one of the most important issues. Hence, regional investigations are necessary. The Persian Gulf is one of the most aggressive regions of the world. In this study, the fib model performance was evaluated by comparison with field measurements on some marine RC structures located in this region. The results show that the parameters in the fib model did not result in good agreement with some of field data. The model parameters were modified for application to this environment. In order to do this, a laboratory study was performed and nine different concrete mixtures with various percentages of silica fume were prepared. Evaluation of the modified model results shows that the modifications produced more reliable results than the original model for this environment.
DOI:
10.14359/51688145
SP303-20
C. Medina, W. Zhu, E.Asensio, I.F. Saéz del Bosque, M. Frías, and M. I. Sánchez de Rojas
The use of superplasticisers to enhance concrete properties is standard practice in concrete manufacture. The present study aimed to assess the compatibility of these admixtures with recycled construction and demolition waste (with or without lightweight materials) aggregate on some the physical and mechanical properties of the resulting concrete. The paper reports on the 0 and 50% replacement of natural coarse aggregate in a conventional concrete with mixed recycled coarse aggregate. The experimental technique used was based on the study of water absorption as well as the compressive and splitting tensile strength of such recycled concretes. The superplasticiser was found to be compatible with this type of recycled aggregate, for no decline in concrete performance was observed.
10.14359/51688140
SP303-21
Wei Li, Yi Wang, Gao-ming Wang, Yu Shi, and Zi-ming Wang
Currently, despite the large production, only about 10% of the fluorosilicates, a by-product from the phosphate fertilizer factories can be recycled, leading to no economic benefits. Moreover, the only way to dispose of fluorosilicates is discharging it into water, bringing about water pollution. However, fluorosilicate can be used as a basic material to improve the strength and hardness and then enhance durability of concrete according to a certain volume-to-weight fraction. In this paper, the enhanced performance of fluorosilicate on concrete was studied via the setting time of cement, the fluidity and strength of mortar, the mixing performance and the strength of the concrete. The enhanced mechanism was analyzed by XRD and SEM methods.
10.14359/51688141
SP303-22
Harvey H. Haynes
This paper summarizes a new ACI publication titled Report on High-Volume Fly Ash Concrete for Structural Applications. High-volume fly ash (HVFA) concrete is a sustainable concrete that is currently available for wide-scale usage. Technical knowledge on the material from over two decades of research and field experience are presented to provide the design and construction industry with confidence in using HVFA concrete.
10.14359/51688142
SP303-18
Frank Shaode Ong, Charles K. Nmai, James Curtis Smith, and John Luciano
The focus of this paper is a new liquid microspheres-based admixture that has been developed to provide freezing and thawing protection of cementitious-based materials under cyclic, saturated conditions, while addressing and eliminating issues typically associated with the use of surfactant-based admixtures for air entrainment. Consequently, this microspheres-based admixture provides unique opportunities and flexibility in reproportioning or optimizing current air-entrained concrete mixtures with respect to using increased levels of supplementary cementitious materials. It is also shown in the paper that the microspheres-based admixture will facilitate the use of materials that typically hinder air entrainment. A microspheres recovery test method that has been developed to measure the microspheres content of fresh content for quality assurance purposes is also presented and discussed.
10.14359/51688138
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