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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 17 Abstracts search results
Document:
SP-361_05
Date:
March 1, 2024
Author(s):
P.V.Premalatha, L.K.Rex, and P.Shahul Hameed
Publication:
Symposium Papers
Volume:
361
Abstract:
The present study addresses the effective utilization of tannery sludge as a partial replacement of fly ash in brick manufacturing. The main objective of this research is to determine the optimal sludge content that can be incorporated in flyash bricks and thereby to assess the key engineering properties while mitigating potential radiological emissions. Sludge incorporated bricks were cast with the tannery sludge varying from 5% to 30 %. The bricks were tested for its compressive strength, water absorption, efflorescence and radiological tests. Samples were prepared for radiation test with varying percentage of tannery sludge. Various parameters, including internal and external hazard indices, radium equivalent activity (Req), annual effective dose rates, and absorbed dose rates, were thoroughly examined in this research. The results of various tests revealed that the newly formulated fly ash tannery bricks showed significant compressive strength upto 20% replacement. The water absorption and efflorescence were found to be within permissible limit as per BIS IS 3495. The gamma-ray spectrometry measurements of Primordial radionuclide activity concentrations, including Uranium-238, Thorium-232, and Potassium-K, in sludge bricks were found well within the permissible limits as per UNSCEAR 2000. The radium equivalent activity was found below the permissible limit of 370 Bq/kg. The absorbed gamma dose, radioactivity level index, external hazard index, indoor effective dose rate and outdoor effective dose rate, were all determined to be below the threshold of one (1.0), indicating that they were comfortably within the safety standards recommended. The results claimed the tannery sludge did not pose any serious radiation effect and it can be utilized as an eco-friendly as well as user- friendly construction material.
DOI:
10.14359/51740607
CI4407Q&A
July 1, 2022
Concrete International
44
Issue:
7
This month’s Q&A features a discussion on moisture in concrete slabs-on-ground. It focuses on water migration; pH on slab surfaces; efflorescence; vapor retarders/barriers; slab curling; moisture in slabs; concrete exposure to water, sulfates, freezing and thawing, and chlorides; admixtures to stop vapor transmission; and concrete moisture and flooring installation.
SP243-02
April 1, 2007
H. Nhar, T. Watanabe, C. Hashimoto, and S. Nagao
243
Today, a number of engineering structures and building are being constructed to match environment and urban landscape. From an aesthetics point of view, occurrences of efflorescence on colored concrete, unfinished concrete and concrete products of these structures are critical problems. This research aimed to study and compare the efflorescence of concrete products that substituted cement with industrial by-products namely, fly ash, blast furnace slag and gypsum and normal concrete. Both concrete products and normal concrete were manufacture for paving application in form of interlocking blocks. In this paper, we use the term "non-cement" concrete to refer to the concrete not using industrial cement. A methodology is presented that enables a quantitative evaluation of the total, soluble and insoluble efflorescence and this methodology was used to analyze both non-cement concrete and normal concrete specimens. The results show that the insoluble efflorescence of non-cement concrete is less than that of normal concrete.
10.14359/18740
SP243
Editor: V.M. Malhotra
This publication contains the proceedings from the Ninth CANMET/ACI International Conference on Recent Advances in Concrete Technology, held in Warsaw, Poland, in May 2007. The nine papers include optimization of mixture proportions of normal, high-performance, and self-consolidating concrete; reactive powder concrete mixtures for producing thin precast elements; and efflorescence of concrete products for interlocking block pavements. 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-243
10.14359/18695
CI2409Neville
September 1, 2002
Adam Neville
24
9
In the Part 1 article on efflorescence, published in last month’s issue of Concrete International, I reviewed our knowledge of efflorescence. This knowledge is not extensive, but we must answer, if only provisionally, the question posed in the title of my articles. To do this we need to review the observations of efflorescence, as well as their significance, and finally, to look at ways of minimizing the occurrence of efflorescence.
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